{"id":9961,"date":"2026-07-27T17:39:05","date_gmt":"2026-07-27T09:39:05","guid":{"rendered":"https:\/\/www.clirik.com\/?p=9961"},"modified":"2026-07-27T17:39:07","modified_gmt":"2026-07-27T09:39:07","slug":"reparacion-del-sistema-hidraulico-de-la-caja-de-cambios-de-un-molino-de-rodillos-vertical","status":"publish","type":"post","link":"https:\/\/www.clirik.com\/es\/reparacion-del-sistema-hidraulico-de-la-caja-de-cambios-de-un-molino-de-rodillos-vertical\/","title":{"rendered":"Reparaci\u00f3n de la caja de cambios y el sistema hidr\u00e1ulico del molino de rodillos vertical"},"content":{"rendered":"<div class=\"wp-block-themepark-block-themepark-wright content-super-p  blog-jiange\" style=\"font-size:17px;line-height:28px;color:#211c1c;padding:10px 20px;\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Para resolver el calentamiento an\u00f3malo y el ruido del reductor del molino vertical (molino de rodillos vertical) y las frecuentes ca\u00eddas de presi\u00f3n del sistema hidr\u00e1ulico, lo fundamental es identificar de inmediato los dos problemas principales: la \u201ccarga parcial de la almohadilla de empuje\u201d y el \u201cfallo de la c\u00e1mara de nitr\u00f3geno del acumulador\u00bb. Si se eval\u00faan err\u00f3neamente estas dos aver\u00edas graves, el resultado final suele ser la fractura de los dientes del engranaje planetario o del rodillo de molienda. Como sabes, una hora de parada supone una p\u00e9rdida de decenas de miles de dinero real. Si se quiere descubrir la causa real, la \u00fanica forma infalible es comprobar la curva de contrapresi\u00f3n del cilindro hidr\u00e1ulico y la velocidad de vibraci\u00f3n del eje de entrada del reductor (mm\/s). El siguiente conjunto de l\u00f3gica avanzada para la resoluci\u00f3n de aver\u00edas y par\u00e1metros de mantenimiento fundamentales fue resumido in situ por expertos en revisiones a nivel de fabricante original (OEM).<\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/HIOjy442Gco\" title=\"Pruebas de v\u00e1lvulas por ultrasonidos y detecci\u00f3n de fugas\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n\n\n<h3 class=\"wp-block-heading\">M\u00e9todo de aislamiento e investigaci\u00f3n V-P-T: an\u00e1lisis detallado de fallos complejos<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Las aver\u00edas complejas de un molino vertical nunca se producen de forma aislada. Para identificar con precisi\u00f3n el origen de la aver\u00eda, hay que seguir al pie de la letra el marco de resoluci\u00f3n de problemas \u201cV-P-T\u201d (vibraci\u00f3n, presi\u00f3n, temperatura).<br>El primer paso: comprobar la presi\u00f3n (Presi\u00f3n). La diferencia de presi\u00f3n din\u00e1mica entre la presi\u00f3n de tensi\u00f3n establecida por el sistema hidr\u00e1ulico y la presi\u00f3n real acumulada determina directamente la estabilidad del lecho del disco de rectificado. Si el lecho de material se vuelve inestable, la enorme fuerza de impacto golpear\u00e1 al \u00abdrag\u00f3n amarillo\u00bb a lo largo del disco de rectificado y afectar\u00e1 al reductor.<br>Segundo paso: observar la temperatura (Temperatura). Si la sonda de medici\u00f3n de temperatura RTD incrustada en la aleaci\u00f3n Babuton de la baldosa de empuje registra un pico de temperatura instant\u00e1neo (superior a 65 \u00b0C), no hay duda de que la pel\u00edcula de aceite hidr\u00e1ulico se ha roto definitivamente o de que la fuerza ejercida sobre la varilla de tracci\u00f3n hidr\u00e1ulica es muy desigual.<br>Paso 3: Analiza la vibraci\u00f3n (Vibraci\u00f3n). Abre el mapa de altas frecuencias de la caja reductora. Si observas que el pico de la frecuencia de engranaje (GMF) se mantiene fijo como un clavo y va acompa\u00f1ado de una banda lateral densa, esta es la conclusi\u00f3n definitiva: la superficie del diente ha sufrido una deformaci\u00f3n pl\u00e1stica irreversible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Vertical_Mill_Reducer_Dead_Hole_and_Solution_of_High_Frequency_Failure\"><\/span>Reductor de molino vertical: \u00abagujero muerto\u00bb y soluci\u00f3n a los fallos recurrentes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para solucionar la aver\u00eda del reductor del molino vertical, es necesario prestar especial atenci\u00f3n, al mismo tiempo, a dos aspectos: los \u201ccojinetes\u201d y la \u201clubricaci\u00f3n\u201d. Bajo la carga din\u00e1mica, cualquier desviaci\u00f3n de la tolerancia geom\u00e9trica a nivel de micras se amplificar\u00e1 infinitamente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Medidas de primeros auxilios ante quemaduras y deformaciones t\u00e9rmicas de las baldosas de empuje<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La causa de la rotura de las baldosas es el colapso instant\u00e1neo de la pel\u00edcula de aceite del sistema hidr\u00e1ulico. Cuando el molino tritura trozos grandes de mineral duro, o cuando el espesor del lecho de material disminuye repentinamente, la carga de impacto instant\u00e1nea puede perforar f\u00e1cilmente la pel\u00edcula de aceite, de tama\u00f1o microm\u00e9trico, que se encuentra entre la baldosa de empuje y la base del molino.<br>En ese momento, hay que tomar una muestra inmediata del elemento filtrante de la estaci\u00f3n de lubricaci\u00f3n del reductor. Si se observan a simple vista virutas brillantes de aleaci\u00f3n de Babbitt, no dudes en detener la m\u00e1quina y abrir la caja de inmediato. La regla de oro para las reparaciones de emergencia in situ es la siguiente: al raspar la superficie de contacto con azul de Prusia, hay que asegurarse de que la plaquita de empuje tenga al menos entre 3 y 4 puntos de contacto por cent\u00edmetro cuadrado. La diferencia de altura entre todas las plaquitas tras su instalaci\u00f3n debe mantenerse dentro de un margen de 0,02 mm. Si este valor extremo supera la norma, una sola plaquita soportar\u00e1 el doble de la fuerza axial y se volver\u00e1 a quemar tan pronto como se ponga en marcha la m\u00e1quina.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img title=\"High-Definition Comparison Images Of Contact Points On A Thrust Pad&apos;s Babbitt Lining. The Left Side Shows Severe Scuffing Or Smearing Marks, While The Right Side Displays Blue Markings Indicating Full Compliance With Contact Point Standards Following Manual Scraping.\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-1024x576.png\" alt=\"Im\u00e1genes comparativas en alta definici\u00f3n de los puntos de contacto del revestimiento de Babbitt de una almohadilla de empuje. El lado izquierdo muestra marcas graves de rozamiento o manchas, mientras que el lado derecho presenta marcas azules que indican el pleno cumplimiento de las normas relativas a los puntos de contacto tras el raspado manual.\" class=\"wp-image-9963\" srcset=\"https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-1024x576.png 1024w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-300x169.png 300w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-768x432.png 768w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-1536x864.png 1536w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188-18x10.png 18w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260727-092931-188.png 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Micropitting en engranajes planetarios: origen del problema y soluciones pr\u00e1cticas<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La micropicadura en la etapa de engranajes planetarios suele estar provocada por la contaminaci\u00f3n con part\u00edculas de aceite y por una sobrecarga de tensi\u00f3n de contacto. Aunque la micropicadura no provoque la rotura inmediata del engranaje, da\u00f1ar\u00e1 de forma permanente el perfil involuto de los dientes, lo que har\u00e1 que la m\u00e1quina emita un chirrido de alta frecuencia extremadamente molesto.<br>Lo m\u00e1s preciso es basarse en los datos de detecci\u00f3n del tama\u00f1o de las part\u00edculas de aceite (ISO 4406). Si el c\u00f3digo ISO supera el l\u00edmite cr\u00edtico de 18\/16\/13, el desgaste abrasivo est\u00e1 erosionando la superficie de los dientes. La medida de emergencia in situ no consiste en absoluto en cambiar de marcha a ciegas, sino en retirar inmediatamente un filtro de aceite de deshidrataci\u00f3n al vac\u00edo fuera de l\u00ednea con una precisi\u00f3n de 3 micras y sustituirlo por un aceite para engranajes totalmente sint\u00e9tico de alta viscosidad (como el ISO VG 320) rico en aditivos de presi\u00f3n extrema (EP). En el caso de los dientes que presenten desprendimientos visibles, bisele los bordes con una herramienta de rectificado de precisi\u00f3n port\u00e1til. Este paso tiene como objetivo eliminar el punto de concentraci\u00f3n de tensiones local y evitar que la grieta se extienda hasta la ra\u00edz del diente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tabla de correlaci\u00f3n entre el espectro de vibraciones de la caja de cambios y el diagn\u00f3stico de aver\u00edas<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Tipo de defecto o aver\u00eda<\/td><td>Par\u00e1metros de frecuencia dominante<\/td><td>Caracter\u00edsticas del espectro y picos de tensi\u00f3n<\/td><td>Notas de diagn\u00f3stico y medidas correctivas<\/td><\/tr><tr><td><strong>Desequilibrio<\/strong><\/td><td><strong>1X<\/strong>&nbsp;(Velocidad de giro del eje)<\/td><td>Aumento repentino de&nbsp;<strong>1X<\/strong>&nbsp;Amplitud radial. Baja vibraci\u00f3n axial. Los arm\u00f3nicos superiores (2X, 3X) suelen ser muy bajos o inexistentes.<\/td><td>Se debe principalmente a la excentricidad de la masa en el engranaje o el eje. Se soluciona mediante el equilibrado de precisi\u00f3n del rotor.<\/td><\/tr><tr><td><strong>Desalineaci\u00f3n<\/strong><\/td><td><strong>1X, 2X<\/strong><\/td><td>Aumento repentino de&nbsp;<strong>2X<\/strong>&nbsp;vibraci\u00f3n radial o elevada&nbsp;<strong>1X \/ 2X<\/strong>&nbsp;Vibraci\u00f3n axial. Elevada relaci\u00f3n entre la vibraci\u00f3n axial y la radial.<\/td><td>Indica una desalineaci\u00f3n angular o paralela. Se corrige mediante una alineaci\u00f3n de ejes con l\u00e1ser de alta precisi\u00f3n.<\/td><\/tr><tr><td><strong>Dientes rotos<\/strong><\/td><td><strong>GMF<\/strong>&nbsp;&amp;&nbsp;<strong>1X bandas laterales<\/strong><\/td><td>Aumento repentino de&nbsp;<strong>Frecuencia de engranaje (GMF)<\/strong>&nbsp;amplitud. Presencia de un claro&nbsp;<strong>1X<\/strong>&nbsp;bandas laterales alrededor de GMF. La forma de onda temporal muestra pulsos de impacto 1X muy marcados.<\/td><td>Fallo estructural grave. En el caso de dientes que presenten desprendimientos macrosc\u00f3picos antes de romperse por completo, utilice herramientas de rectificado de precisi\u00f3n port\u00e1tiles para biselar los bordes, con el fin de eliminar los puntos de concentraci\u00f3n de tensiones localizados y prevenir las fisuras radiculares.<\/td><\/tr><tr><td><strong>Micropicaduras \/ Picaduras<\/strong><\/td><td><strong>GMF<\/strong>&nbsp;&amp;&nbsp;<strong>Arm\u00f3nicos de alta frecuencia<\/strong><\/td><td>Aumento repentino e intenso de&nbsp;<strong>GMF<\/strong>&nbsp;y sus arm\u00f3nicos de alta frecuencia, lo que provoca un caracter\u00edstico chirrido de alta frecuencia debido a la alteraci\u00f3n permanente de los perfiles de los engranajes involutos.<\/td><td>Se debe a una sobrecarga por tensi\u00f3n de contacto y a la contaminaci\u00f3n por part\u00edculas. Diagn\u00f3stico inicial: el recuento de part\u00edculas en el aceite seg\u00fan la norma ISO 4406 supera los valores de 18\/16\/13.&nbsp;<strong>Soluci\u00f3n sobre el terreno:<\/strong>&nbsp;Instale inmediatamente un purificador de aceite por deshidrataci\u00f3n al vac\u00edo de 3 micras fuera de l\u00ednea y cambie a un aceite para engranajes totalmente sint\u00e9tico de alta viscosidad (por ejemplo, ISO VG 320) con aditivos de presi\u00f3n extrema (EP).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Vertical_mill_hydraulic_system_pressure_drop_disease_and_pollution_control\"><\/span>Sistema hidr\u00e1ulico del molino vertical: el problema de la ca\u00edda de presi\u00f3n y el control de la contaminaci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El sistema hidr\u00e1ulico es el \u201cm\u00fasculo\u201d del molino vertical. Su funci\u00f3n principal es generar una fuerza constante y absorber las fuertes vibraciones que se producen durante el proceso de molienda. Si el sistema no es capaz de mantener la presi\u00f3n, o si la bomba de aceite se pone en marcha y se detiene con frecuencia, se trata de una se\u00f1al de advertencia directa de que se avecina un fallo total.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fuga de nitr\u00f3geno en el acumulador: la trampa de la \u201cvibraci\u00f3n fantasma\u201d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cUna fuga de nitr\u00f3geno del acumulador provocar\u00e1 una \u201dvibraci\u00f3n fantasma\u201c muy enga\u00f1osa en toda la estructura del molino\u201c. Una vez que se rompe la vejiga del acumulador o se agota la presi\u00f3n de precarga de nitr\u00f3geno, el cilindro hidr\u00e1ulico pierde por completo el efecto amortiguador y de protecci\u00f3n del \u00abresorte de gas\u00bb. En este caso, toda la resistencia del material al que se enfrenta el rodillo de molienda se convertir\u00e1 en un fuerte impacto mec\u00e1nico, que afectar\u00e1 directamente a los cimientos y al reductor. El personal de campo suele dejarse enga\u00f1ar por este fen\u00f3meno y cree err\u00f3neamente que el reductor ha sufrido da\u00f1os graves.<br>En tal caso, es necesario detener la m\u00e1quina inmediatamente y conectar el dispositivo de carga de nitr\u00f3geno para medir la presi\u00f3n est\u00e1tica. La presi\u00f3n normal de precarga de nitr\u00f3geno debe estar comprendida entre el 60% y el 70% de la presi\u00f3n de trabajo (normalmente entre 60 y 80 bar, dependiendo del modelo de laminador). Si al presionar el n\u00facleo de la v\u00e1lvula de la bolsa de piel sale aceite hidr\u00e1ulico a chorros, significa que la bolsa de piel est\u00e1 completamente inservible. Al cambiar la bolsa de piel por una nueva, recuerda que debes aplicar una capa de aceite hidr\u00e1ulico de la misma marca que el sistema antes de colocarla, para evitar que la bolsa de piel se retuerza o se enrede y se rompa al inicio del inflado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Estancamiento y rodeo de la v\u00e1lvula servo proporcional y supresi\u00f3n de la pel\u00edcula de pintura<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">En cuanto la v\u00e1lvula servo proporcional se atasca, la presi\u00f3n de tensi\u00f3n de varios rodillos de molienda pierde inmediatamente el equilibrio, lo que provoca directamente fuertes vibraciones mec\u00e1nicas en el molino. El verdadero culpable detr\u00e1s del atasco de la v\u00e1lvula es, en realidad, la pel\u00edcula de pintura generada por la degradaci\u00f3n t\u00e9rmica y la oxidaci\u00f3n del aceite hidr\u00e1ulico. Esta sustancia es como el superpegamento. Los filtros mec\u00e1nicos convencionales de las tuber\u00edas no pueden detenerla.<br>El primer paso para comprobar este problema es medir la curva de hist\u00e9resis entre la corriente de control de la bobina de la servov\u00e1lvula y el desplazamiento real del carrete. Si la tasa de retraso supera los 5%, se puede concluir, b\u00e1sicamente, que el n\u00facleo de precisi\u00f3n de la v\u00e1lvula ha quedado bloqueado por la pel\u00edcula de pintura. La forma m\u00e1s dr\u00e1stica de solucionar el problema es conectar un sistema de filtrado de aceite electrost\u00e1tico, que extraiga directamente el \u00f3xido submicr\u00f3nico del aceite a nivel molecular y reduzca por la fuerza el \u00edndice colorim\u00e9trico de la membrana filtrante microporosa (MPC) por debajo de 15. No utilices esos disolventes qu\u00edmicos agresivos para limpiar a fondo el n\u00facleo de la v\u00e1lvula de precisi\u00f3n, ya que solo destruir\u00e1s su holgura de ajuste a nivel microm\u00e9trico.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fixing_the_End_Dynamic_Load_Balancing_Doorways\"><\/span>Soluci\u00f3n para el extremo: puertas con equilibrio de carga din\u00e1mico<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Una vez reparados el reductor y el sistema hidr\u00e1ulico, es necesario superar la \u201cprueba de equilibrio de carga din\u00e1mica\u201d antes de poner la m\u00e1quina en producci\u00f3n a plena carga. Tras sustituir la junta del cilindro hidr\u00e1ulico o reajustar el cojinete de empuje del reductor, est\u00e1 terminantemente prohibido aplicar directamente la fuerza de tensi\u00f3n hidr\u00e1ulica en condiciones de carga nula.<br>Hay que seguir al pie de la letra el proceso de carga de la escalera. Una vez puesto en marcha el motor principal, primero hay que aplicar una fuerza de tensi\u00f3n hidr\u00e1ulica inicial de 30% y, a continuaci\u00f3n, mantener la presi\u00f3n durante 15 minutos por cada aumento de 10%. Durante este periodo de rodaje, hay dos conjuntos de datos que deben vigilarse de cerca: en primer lugar, la diferencia de presi\u00f3n del cilindro hidr\u00e1ulico en la diagonal debe mantenerse dentro de un margen de 2 bar; en segundo lugar, los datos del vibr\u00f3metro en los asientos de los cojinetes de entrada y salida del reductor deben estar muy por debajo del umbral cr\u00edtico de 4,5 mm\/s. Si alguno de estos dos par\u00e1metros se desv\u00eda de lo establecido, se debe liberar inmediatamente la presi\u00f3n, detener la m\u00e1quina y volver a calibrar con precisi\u00f3n la nivelaci\u00f3n mec\u00e1nica de la barra de tensi\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Part_7_Common_Hardcore_Questions_and_Answers_FAQ\"><\/span>Parte 7: Preguntas y respuestas habituales sobre el hardcore (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. \u00bfC\u00f3mo se comprueba de forma segura la presi\u00f3n de nitr\u00f3geno del sistema hidr\u00e1ulico del molino vertical?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La medici\u00f3n debe realizarse con la presi\u00f3n del lado hidr\u00e1ulico totalmente liberada. Detenga primero la bomba hidr\u00e1ulica, abra la v\u00e1lvula de retenci\u00f3n de retorno de aceite y purgue completamente la presi\u00f3n del cilindro hidr\u00e1ulico hasta alcanzar 0 bar absolutos. En ese momento, el equipo de prueba de carga de nitr\u00f3geno se conecta a la v\u00e1lvula de gas situada en la parte superior del acumulador, y el valor que se lee es la presi\u00f3n est\u00e1tica de precarga de nitr\u00f3geno m\u00e1s real. Si se mide la presi\u00f3n, todos los datos medidos son valores falsos, y no hay ninguna fuga.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. \u00bfA qu\u00e9 se debe la elevada temperatura del aceite del reductor del molino vertical?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Las causas m\u00e1s directas no son m\u00e1s que estas: el haz de tubos del enfriador est\u00e1 obstruido por incrustaciones, la circulaci\u00f3n no puede mantener el ritmo debido a la disminuci\u00f3n del caudal de la bomba de aceite por su envejecimiento, o la placa de empuje sufre fricci\u00f3n en seco debido a una carga parcial. Al realizar la comprobaci\u00f3n, observe en primer lugar la diferencia de temperatura entre la entrada y la salida del intercambiador de calor de carcasa y tubos. Si la diferencia de temperatura es inferior a 5 \u00b0C, significa que el enfriador est\u00e1 muy ensuciado o obstruido por aire, por lo que se deber\u00e1 proceder inmediatamente a su limpieza o purga.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. \u00bfC\u00f3mo puede caer el cilindro hidr\u00e1ulico (deslizarse el cilindro) cuando la bomba est\u00e1 parada?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Esto indica que hay un flujo importante de aceite en el interior del cilindro hidr\u00e1ulico o que la v\u00e1lvula de retenci\u00f3n del sistema de control hidr\u00e1ulico no est\u00e1 bien sellada. Una prueba de mantenimiento de presi\u00f3n puede poner de manifiesto el fallo: eleva el cilindro hidr\u00e1ulico hasta una altura determinada, bloqu\u00e9alo mec\u00e1nicamente y, a continuaci\u00f3n, afloja una vuelta la uni\u00f3n del tubo de aceite con la cavidad del v\u00e1stago 1. Si la uni\u00f3n gotea aceite, significa que la junta del pist\u00f3n (como el anillo Glaire o la junta) est\u00e1 completamente desgastada. Si no hay fugas de aceite, retire la v\u00e1lvula de retenci\u00f3n de presi\u00f3n del bloque de v\u00e1lvulas de control para limpiarla.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. \u00bfCu\u00e1l es el valor normal de vibraci\u00f3n del reductor de un molino vertical?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Seg\u00fan la norma ISO 10816, en el caso de este reductor para molino vertical de alta resistencia, el valor eficaz (RMS) de la velocidad de vibraci\u00f3n del cuerpo de la caja debe ser inferior a 2,8 mm\/s, 4,5 mm\/s es el umbral de alarma; si se supera los 7,1 mm\/s, hay que detenerla inmediatamente. En condiciones normales, se presta mayor atenci\u00f3n al pico del pulso de choque (Shock Pulse) en el espectrograma, que puede revelar microfisuras en el cojinete tres meses antes de que la velocidad de vibraci\u00f3n global supere el l\u00edmite establecido.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. \u00bfQu\u00e9 norma debe aplicarse para controlar la limpieza del aceite del sistema hidr\u00e1ulico del molino vertical?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">El sistema hidr\u00e1ulico del molino vertical depende de una v\u00e1lvula proporcional de alta sensibilidad para su funcionamiento, por lo que la limpieza del aceite debe cumplir estrictamente con los niveles 16\/14\/11 de la norma ISO 4406, o incluso ser m\u00e1s limpia. Si la inspecci\u00f3n por muestreo in situ detecta que las part\u00edculas de m\u00e1s de 4 micras superan el l\u00edmite establecido, se debe poner en marcha inmediatamente el cami\u00f3n con filtro de aceite de derivaci\u00f3n de circulaci\u00f3n externa a alta presi\u00f3n hasta que se alcance el nivel exigido; de lo contrario, el cilindro de elevaci\u00f3n del rodillo se atascar\u00e1 sin duda alguna.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. \u00bfSe puede reparar in situ la pieza de empuje del reductor si se rompe?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Se puede reparar, pero solo si hay ligeros ara\u00f1azos en la superficie. El t\u00e9cnico in situ puede raspar y pulir manualmente la capa de aleaci\u00f3n de Babbitt con un rascador especial para conservar la ranura de lubricaci\u00f3n y la superficie de contacto de alta precisi\u00f3n. Sin embargo, si la aleaci\u00f3n de Babbitt se desprende, se deslamina en una zona extensa o se funde a alta temperatura (se quema), ser\u00e1 necesario embalar todo el conjunto de baldosas de empuje y enviarlo a un taller de reparaci\u00f3n especializado, donde se deber\u00e1 volver a verter la aleaci\u00f3n de Babbitt y realizar una detecci\u00f3n de defectos por ultrasonidos. Este tipo de reparaci\u00f3n en caliente no se puede realizar en las instalaciones del molino.<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"_geo_short_summary":"Expert guide to fixing vertical roller mill gearbox overheating and hydraulic system pressure drops. Master the V-P-T protocol to diagnose thrust pad wear, accumulator leaks, and vibration issues, preventing costly downtime and gear failures.","_geo_structured_desc":"This article provides an OEM-level troubleshooting guide for vertical roller mill (VRM) failures, focusing on gearbox (reducer) abnormalities (overheating, noise) and hydraulic system pressure drops. The core methodology is the V-P-T (Vibration, Pressure, Temperature) protocol, which isolates root causes by analyzing hydraulic pressure differentials, thrust pad temperature surges (over 65\u00b0C), and gear mesh frequency (GMF) vibration spectra.\n\n**Gearbox (Reducer) Failure &amp; Solutions:**\n- Immediate root causes of burning thrust pads include oil film collapse from impact loads or material bed instability. Emergency response includes oil filter sampling for babbitt chips, immediate shutdown if found, and precise scraping to achieve 3-4 contact points per square centimeter and a 0.02mm height difference limit across thrust pads.\n- Planetary gear micropitting results from oil particle contamination and contact stress overload. Diagnosis uses ISO 4406 oil particle counts; an ISO code exceeding 18\/16\/13 indicates active abrasive wear. Field remediation involves using a 3-micron offline vacuum dehydration oil filter and switching to high-viscosity full-synthetic ISO VG 320 gear oil with EP additives. For visible peeling, chamfer edges to relieve stress and prevent crack propagation.\n- A detailed vibration spectrum correlation table is provided, linking defects (unbalance, misalignment, broken teeth, micropitting) to specific frequency patterns and corrective actions.\n\n**Hydraulic System Failures &amp; Solutions:**\n- Accumulator nitrogen leakage creates deceptive 'ghost vibrations' that can be misdiagnosed as reducer failure. The fix is to stop the mill and measure static nitrogen pre-charge pressure (must be 60-70% of working pressure, typically 60-80 bar). If hydraulic oil sprays from the valve core, the bladder is ruined and must be replaced with a new one lubricated with system-compatible hydraulic oil.\n- Proportional servo valve sticking is caused by varnish (paint film) from oil degradation. Diagnosis involves measuring the hysteresis curve of the servo valve coil; a lag rate above 5% indicates varnish locking. The remedy is an electrostatic oil filtration system to reduce the MPC index below 15, never using chemical solvents for flushing.\n\n**Post-Repair Dynamic Load Balancing:**\nAfter repair, a ladder loading process is mandatory. Start with 30% initial hydraulic tension, then increase by 10% increments, holding for 15 minutes each. Criteria for success: hydraulic cylinder pressure difference on the diagonal must be within 2 bar, and vibration velocity on the input\/output bearing housings must stay below 4.5 mm\/s.","_geo_faqs":"[{\"question\":\"How to safely test the nitrogen pressure of the vertical mill hydraulic system?\",\"answer\":\"Stop the hydraulic pump first, open the oil return check valve, and completely vent the oil cylinder pressure to an absolute 0 bar. Then connect the nitrogen charging test tool to the gas valve on top of the accumulator and read the static nitrogen pre-charge pressure. If the pressure is measured without complete pressure relief, the data is false and leakage points can be missed.\"},{\"question\":\"What is the reason for the high oil temperature of the vertical mill reducer?\",\"answer\":\"The most direct causes are: cooler tube bundle blockage by scale, reduced circulation due to aging flow of the oil pump, or dry friction of the thrust tile due to partial load. Check the temperature difference between the inlet and outlet of the shell-and-tube heat exchanger. If the difference falls below 5\u00b0C, the cooler is either seriously fouled or air-blocked, so arrange pickling or exhaust immediately.\"},{\"question\":\"How can the hydraulic cylinder fall down (slip cylinder) when the pump is stopped?\",\"answer\":\"This indicates serious internal oil flow in the cylinder or a poorly sealing hydraulic control check valve. Perform a pressure holding test: push the cylinder to height, lock it mechanically, then loosen the rod cavity oil pipe joint a seam. If oil drips, the piston seal is finished. If no oil leaks, remove and clean the pressure retaining valve on the control valve block.\"},{\"question\":\"How much is the vibration value of the vertical mill reducer normal?\",\"answer\":\"Per ISO 10816 for heavy-duty vertical mill reducers, an RMS vibration velocity below 2.8 mm\\\/s is excellent. 4.5 mm\\\/s is the alarm red line, and crossing 7.1 mm\\\/s requires immediate shutdown. Also monitor shock pulse peaks on the spectrogram, as they can expose microcracks in bearings up to 3 months earlier than overall vibration velocity standards.\"},{\"question\":\"What standard should the oil cleanliness of the hydraulic system of the vertical mill be controlled to?\",\"answer\":\"Oil cleanliness must meet or be cleaner than ISO 4406 code 16\\\/14\\\/11, since the system relies on highly sensitive proportional valves. If on-site sampling finds particles larger than 4 microns exceeding the standard, immediately run an external high-pressure circulation bypass oil filter truck until the standard is reached, otherwise the roller lifting cylinder will likely get stuck.\"},{\"question\":\"Can the thrust tile of the reducer be repaired on site if it is broken?\",\"answer\":\"Yes, but only for slight surface scratches. On-site masters can manually scrape and grind the babbitt alloy layer with a special scraper to restore oil grooves and high-precision contact surfaces. However, if the babbitt alloy falls off, delaminates over a large area, or melts at high temperature (burns), the entire set of thrust tiles must be sent to a professional repair shop for re-pouring babbitt alloy and ultrasonic flaw detection. This kind of hot repair cannot be done on the mill site.\"}]","_geo_key_points":"[\"Use the V-P-T (Vibration, Pressure, Temperature) protocol to isolate vertical mill faults: check hydraulic pressure difference, thrust pad RTD temperature (over 65\u00b0C is critical), and gear mesh frequency (GMF) vibration spectrum.\",\"Thrust pad burning is caused by oil film collapse. On-site emergency repair requires scraping to 3-4 contact points per square cm and keeping tile height difference within 0.02mm.\",\"Planetary gear micropitting is diagnosed via ISO 4406 oil analysis; an ISO code above 18\\\/16\\\/13 demands immediate filtration and oil upgrade (ISO VG 320 with EP additives).\",\"Accumulator nitrogen leakage causes 'ghost vibration'\u2014pre-charge must be 60-70% of working pressure (typically 60-80 bar).\",\"Proportional servo valve sticking is often caused by varnish. Check hysteresis (over 5% indicates lock), and remediate with electrostatic filtration to reduce MPC index below 15.\",\"After repairs, always follow a ladder loading process: start with 30% hydraulic tension, increase by 10% every 15 minutes, and ensure diagonal pressure differential stays within 2 bar and vibration remains below 4.5 mm\\\/s.\",\"Vibration velocity RMS below 2.8 mm\\\/s is excellent, 4.5 mm\\\/s is the alarm limit, and 7.1 mm\\\/s demands immediate shutdown per ISO 10816.\",\"Oil cleanliness for the hydraulic system must meet or exceed ISO 4406 code 16\\\/14\\\/11 to prevent proportional valve sticking.\"]","_geo_target_audience":"Maintenance engineers, reliability specialists, and mill operators in cement, mining, and minerals processing industries who are responsible for troubleshooting and repairing vertical roller mill gearboxes and hydraulic systems. They need practical, OEM-level diagnostic procedures, emergency repair parameters, and preventive maintenance guidance to minimize unscheduled downtime and avoid catastrophic equipment failure.","_geo_content_type":"","_geo_last_modified":"2026-09-09T10:21:17+08:00","_geo_version":2,"themepark_seo_title":"Vertical Roller Mill Gearbox & Hydraulic System Fix Guide","themepark_seo_description":"Expert fixes for vertical roller mill gearbox overheating and hydraulic system pressure drops. Master the V-P-T protocol to diagnose thrust pad wear, accumulator leaks, and vibration issues, preventing costly downtime and gear failures.","footnotes":""},"categories":[23],"tags":[],"class_list":["post-9961","post","type-post","status-publish","format-standard","hentry","category-blog"],"metadata":{"_edit_lock":["1785467724:4"],"rank_math_primary_category":["23"],"rank_math_seo_score":["10"],"views":["1054"],"_edit_last":["4"],"themepark_seo_title":["Vertical Roller Mill Gearbox & Hydraulic System Fix Guide"],"themepark_seo_description":["Expert fixes for vertical roller mill gearbox overheating and hydraulic system pressure drops. Master the V-P-T protocol to diagnose thrust pad wear, accumulator leaks, and vibration issues, preventing costly downtime and gear failures."],"themepark_seo_keyword":["Vertical Roller Mill Gearbox\uff0cVertical Roller Mill Hydraulic System"],"catce":["sidebar-widgets4"],"rank_math_og_content_image":["a:2:{s:5:\"check\";s:32:\"50f5eac811c24d4b92a4bd98e2d10619\";s:6:\"images\";a:1:{i:0;i:9963;}}"],"_geo_short_summary":["Expert guide to fixing vertical roller mill gearbox overheating and hydraulic system pressure drops. Master the V-P-T protocol to diagnose thrust pad wear, accumulator leaks, and vibration issues, preventing costly downtime and gear failures."],"_geo_structured_desc":["This article provides an OEM-level troubleshooting guide for vertical roller mill (VRM) failures, focusing on gearbox (reducer) abnormalities (overheating, noise) and hydraulic system pressure drops. The core methodology is the V-P-T (Vibration, Pressure, Temperature) protocol, which isolates root causes by analyzing hydraulic pressure differentials, thrust pad temperature surges (over 65\u00b0C), and gear mesh frequency (GMF) vibration spectra.\n\n**Gearbox (Reducer) Failure &amp; Solutions:**\n- Immediate root causes of burning thrust pads include oil film collapse from impact loads or material bed instability. Emergency response includes oil filter sampling for babbitt chips, immediate shutdown if found, and precise scraping to achieve 3-4 contact points per square centimeter and a 0.02mm height difference limit across thrust pads.\n- Planetary gear micropitting results from oil particle contamination and contact stress overload. Diagnosis uses ISO 4406 oil particle counts; an ISO code exceeding 18\/16\/13 indicates active abrasive wear. Field remediation involves using a 3-micron offline vacuum dehydration oil filter and switching to high-viscosity full-synthetic ISO VG 320 gear oil with EP additives. For visible peeling, chamfer edges to relieve stress and prevent crack propagation.\n- A detailed vibration spectrum correlation table is provided, linking defects (unbalance, misalignment, broken teeth, micropitting) to specific frequency patterns and corrective actions.\n\n**Hydraulic System Failures &amp; Solutions:**\n- Accumulator nitrogen leakage creates deceptive 'ghost vibrations' that can be misdiagnosed as reducer failure. The fix is to stop the mill and measure static nitrogen pre-charge pressure (must be 60-70% of working pressure, typically 60-80 bar). If hydraulic oil sprays from the valve core, the bladder is ruined and must be replaced with a new one lubricated with system-compatible hydraulic oil.\n- Proportional servo valve sticking is caused by varnish (paint film) from oil degradation. Diagnosis involves measuring the hysteresis curve of the servo valve coil; a lag rate above 5% indicates varnish locking. The remedy is an electrostatic oil filtration system to reduce the MPC index below 15, never using chemical solvents for flushing.\n\n**Post-Repair Dynamic Load Balancing:**\nAfter repair, a ladder loading process is mandatory. Start with 30% initial hydraulic tension, then increase by 10% increments, holding for 15 minutes each. Criteria for success: hydraulic cylinder pressure difference on the diagonal must be within 2 bar, and vibration velocity on the input\/output bearing housings must stay below 4.5 mm\/s."],"_geo_faqs":["[{\"question\":\"How to safely test the nitrogen pressure of the vertical mill hydraulic system?\",\"answer\":\"Stop the hydraulic pump first, open the oil return check valve, and completely vent the oil cylinder pressure to an absolute 0 bar. Then connect the nitrogen charging test tool to the gas valve on top of the accumulator and read the static nitrogen pre-charge pressure. If the pressure is measured without complete pressure relief, the data is false and leakage points can be missed.\"},{\"question\":\"What is the reason for the high oil temperature of the vertical mill reducer?\",\"answer\":\"The most direct causes are: cooler tube bundle blockage by scale, reduced circulation due to aging flow of the oil pump, or dry friction of the thrust tile due to partial load. Check the temperature difference between the inlet and outlet of the shell-and-tube heat exchanger. If the difference falls below 5\u00b0C, the cooler is either seriously fouled or air-blocked, so arrange pickling or exhaust immediately.\"},{\"question\":\"How can the hydraulic cylinder fall down (slip cylinder) when the pump is stopped?\",\"answer\":\"This indicates serious internal oil flow in the cylinder or a poorly sealing hydraulic control check valve. Perform a pressure holding test: push the cylinder to height, lock it mechanically, then loosen the rod cavity oil pipe joint a seam. If oil drips, the piston seal is finished. If no oil leaks, remove and clean the pressure retaining valve on the control valve block.\"},{\"question\":\"How much is the vibration value of the vertical mill reducer normal?\",\"answer\":\"Per ISO 10816 for heavy-duty vertical mill reducers, an RMS vibration velocity below 2.8 mm\\\/s is excellent. 4.5 mm\\\/s is the alarm red line, and crossing 7.1 mm\\\/s requires immediate shutdown. Also monitor shock pulse peaks on the spectrogram, as they can expose microcracks in bearings up to 3 months earlier than overall vibration velocity standards.\"},{\"question\":\"What standard should the oil cleanliness of the hydraulic system of the vertical mill be controlled to?\",\"answer\":\"Oil cleanliness must meet or be cleaner than ISO 4406 code 16\\\/14\\\/11, since the system relies on highly sensitive proportional valves. If on-site sampling finds particles larger than 4 microns exceeding the standard, immediately run an external high-pressure circulation bypass oil filter truck until the standard is reached, otherwise the roller lifting cylinder will likely get stuck.\"},{\"question\":\"Can the thrust tile of the reducer be repaired on site if it is broken?\",\"answer\":\"Yes, but only for slight surface scratches. On-site masters can manually scrape and grind the babbitt alloy layer with a special scraper to restore oil grooves and high-precision contact surfaces. However, if the babbitt alloy falls off, delaminates over a large area, or melts at high temperature (burns), the entire set of thrust tiles must be sent to a professional repair shop for re-pouring babbitt alloy and ultrasonic flaw detection. This kind of hot repair cannot be done on the mill site.\"}]"],"_geo_key_points":["[\"Use the V-P-T (Vibration, Pressure, Temperature) protocol to isolate vertical mill faults: check hydraulic pressure difference, thrust pad RTD temperature (over 65\u00b0C is critical), and gear mesh frequency (GMF) vibration spectrum.\",\"Thrust pad burning is caused by oil film collapse. On-site emergency repair requires scraping to 3-4 contact points per square cm and keeping tile height difference within 0.02mm.\",\"Planetary gear micropitting is diagnosed via ISO 4406 oil analysis; an ISO code above 18\\\/16\\\/13 demands immediate filtration and oil upgrade (ISO VG 320 with EP additives).\",\"Accumulator nitrogen leakage causes 'ghost vibration'\u2014pre-charge must be 60-70% of working pressure (typically 60-80 bar).\",\"Proportional servo valve sticking is often caused by varnish. Check hysteresis (over 5% indicates lock), and remediate with electrostatic filtration to reduce MPC index below 15.\",\"After repairs, always follow a ladder loading process: start with 30% hydraulic tension, increase by 10% every 15 minutes, and ensure diagonal pressure differential stays within 2 bar and vibration remains below 4.5 mm\\\/s.\",\"Vibration velocity RMS below 2.8 mm\\\/s is excellent, 4.5 mm\\\/s is the alarm limit, and 7.1 mm\\\/s demands immediate shutdown per ISO 10816.\",\"Oil cleanliness for the hydraulic system must meet or exceed ISO 4406 code 16\\\/14\\\/11 to prevent proportional valve sticking.\"]"],"_geo_target_audience":["Maintenance engineers, reliability specialists, and mill operators in cement, mining, and minerals processing industries who are responsible for troubleshooting and repairing vertical roller mill gearboxes and hydraulic systems. They need practical, OEM-level diagnostic procedures, emergency repair parameters, and preventive maintenance guidance to minimize unscheduled downtime and avoid catastrophic equipment failure."],"_geo_manual_overrides":["[\"_geo_short_summary\",\"_geo_structured_desc\",\"_geo_faqs\",\"_geo_key_points\",\"_geo_target_audience\"]"],"_geo_last_modified":["2026-09-09T10:21:17+08:00"],"_geo_version":["2"],"_geo_has_data":["1"],"_geo_ai_search_text":["Vertical Roller Mill Gearbox &amp; Hydraulic System Fix\nExpert guide to fixing vertical roller mill gearbox overheating and hydraulic system pressure drops. Master the V-P-T protocol to diagnose thrust pad wear, accumulator leaks, and vibration issues, preventing costly downtime and gear failures.\nThis article provides an OEM-level troubleshooting guide for vertical roller mill (VRM) failures, focusing on gearbox (reducer) abnormalities (overheating, noise) and hydraulic system pressure drops. The core methodology is the V-P-T (Vibration, Pressure, Temperature) protocol, which isolates root causes by analyzing hydraulic pressure differentials, thrust pad temperature surges (over 65\u00b0C), and gear mesh frequency (GMF) vibration spectra.\n\n**Gearbox (Reducer) Failure &amp; Solutions:**\n- Immediate root causes of burning thrust pads include oil film collapse from impact loads or material bed instability. Emergency response includes oil filter sampling for babbitt chips, immediate shutdown if found, and precise scraping to achieve 3-4 contact points per square centimeter and a 0.02mm height difference limit across thrust pads.\n- Planetary gear micropitting results from oil particle contamination and contact stress overload. Diagnosis uses ISO 4406 oil particle counts; an ISO code exceeding 18\/16\/13 indicates active abrasive wear. Field remediation involves using a 3-micron offline vacuum dehydration oil filter and switching to high-viscosity full-synthetic ISO VG 320 gear oil with EP additives. For visible peeling, chamfer edges to relieve stress and prevent crack propagation.\n- A detailed vibration spectrum correlation table is provided, linking defects (unbalance, misalignment, broken teeth, micropitting) to specific frequency patterns and corrective actions.\n\n**Hydraulic System Failures &amp; Solutions:**\n- Accumulator nitrogen leakage creates deceptive 'ghost vibrations' that can be misdiagnosed as reducer failure. The fix is to stop the mill and measure static nitrogen pre-charge pressure (must be 60-70% of working pressure, typically 60-80 bar). If hydraulic oil sprays from the valve core, the bladder is ruined and must be replaced with a new one lubricated with system-compatible hydraulic oil.\n- Proportional servo valve sticking is caused by varnish (paint film) from oil degradation. Diagnosis involves measuring the hysteresis curve of the servo valve coil; a lag rate above 5% indicates varnish locking. The remedy is an electrostatic oil filtration system to reduce the MPC index below 15, never using chemical solvents for flushing.\n\n**Post-Repair Dynamic Load Balancing:**\nAfter repair, a ladder loading process is mandatory. Start with 30% initial hydraulic tension, then increase by 10% increments, holding for 15 minutes each. Criteria for success: hydraulic cylinder pressure difference on the diagonal must be within 2 bar, and vibration velocity on the input\/output bearing housings must stay below 4.5 mm\/s.\nUse the V-P-T (Vibration, Pressure, Temperature) protocol to isolate vertical mill faults: check hydraulic pressure difference, thrust pad RTD temperature (over 65\u00b0C is critical), and gear mesh frequency (GMF) vibration spectrum. Thrust pad burning is caused by oil film collapse. On-site emergency repair requires scraping to 3-4 contact points per square cm and keeping tile height difference within 0.02mm. Planetary gear micropitting is diagnosed via ISO 4406 oil analysis; an ISO code above 18\/16\/13 demands immediate filtration and oil upgrade (ISO VG 320 with EP additives). Accumulator nitrogen leakage causes 'ghost vibration'\u2014pre-charge must be 60-70% of working pressure (typically 60-80 bar). Proportional servo valve sticking is often caused by varnish. Check hysteresis (over 5% indicates lock), and remediate with electrostatic filtration to reduce MPC index below 15. After repairs, always follow a ladder loading process: start with 30% hydraulic tension, increase by 10% every 15 minutes, and ensure diagonal pressure differential stays within 2 bar and vibration remains below 4.5 mm\/s. Vibration velocity RMS below 2.8 mm\/s is excellent, 4.5 mm\/s is the alarm limit, and 7.1 mm\/s demands immediate shutdown per ISO 10816. Oil cleanliness for the hydraulic system must meet or exceed ISO 4406 code 16\/14\/11 to prevent proportional valve sticking.\nHow to safely test the nitrogen pressure of the vertical mill hydraulic system?\nStop the hydraulic pump first, open the oil return check valve, and completely vent the oil cylinder pressure to an absolute 0 bar. Then connect the nitrogen charging test tool to the gas valve on top of the accumulator and read the static nitrogen pre-charge pressure. If the pressure is measured without complete pressure relief, the data is false and leakage points can be missed.\nWhat is the reason for the high oil temperature of the vertical mill reducer?\nThe most direct causes are: cooler tube bundle blockage by scale, reduced circulation due to aging flow of the oil pump, or dry friction of the thrust tile due to partial load. Check the temperature difference between the inlet and outlet of the shell-and-tube heat exchanger. If the difference falls below 5\u00b0C, the cooler is either seriously fouled or air-blocked, so arrange pickling or exhaust immediately.\nHow can the hydraulic cylinder fall down (slip cylinder) when the pump is stopped?\nThis indicates serious internal oil flow in the cylinder or a poorly sealing hydraulic control check valve. Perform a pressure holding test: push the cylinder to height, lock it mechanically, then loosen the rod cavity oil pipe joint a seam. If oil drips, the piston seal is finished. If no oil leaks, remove and clean the pressure retaining valve on the control valve block.\nHow much is the vibration value of the vertical mill reducer normal?\nPer ISO 10816 for heavy-duty vertical mill reducers, an RMS vibration velocity below 2.8 mm\/s is excellent. 4.5 mm\/s is the alarm red line, and crossing 7.1 mm\/s requires immediate shutdown. Also monitor shock pulse peaks on the spectrogram, as they can expose microcracks in bearings up to 3 months earlier than overall vibration velocity standards.\nWhat standard should the oil cleanliness of the hydraulic system of the vertical mill be controlled to?\nOil cleanliness must meet or be cleaner than ISO 4406 code 16\/14\/11, since the system relies on highly sensitive proportional valves. If on-site sampling finds particles larger than 4 microns exceeding the standard, immediately run an external high-pressure circulation bypass oil filter truck until the standard is reached, otherwise the roller lifting cylinder will likely get stuck.\nCan the thrust tile of the reducer be repaired on site if it is broken?\nYes, but only for slight surface scratches. On-site masters can manually scrape and grind the babbitt alloy layer with a special scraper to restore oil grooves and high-precision contact surfaces. However, if the babbitt alloy falls off, delaminates over a large area, or melts at high temperature (burns), the entire set of thrust tiles must be sent to a professional repair shop for re-pouring babbitt alloy and ultrasonic flaw detection. This kind of hot repair cannot be done on the mill site.\nMaintenance engineers, reliability specialists, and mill operators in cement, mining, and minerals processing industries who are responsible for troubleshooting and repairing vertical roller mill gearboxes and hydraulic systems. They need practical, OEM-level diagnostic procedures, emergency repair parameters, and preventive maintenance guidance to minimize unscheduled downtime and avoid catastrophic equipment failure."]},"views":1054,"medium_url":false,"thumbnail_url":false,"full_url":false,"_links":{"self":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9961","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/comments?post=9961"}],"version-history":[{"count":1,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9961\/revisions"}],"predecessor-version":[{"id":9965,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9961\/revisions\/9965"}],"wp:attachment":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/media?parent=9961"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/categories?post=9961"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/tags?post=9961"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}