{"id":9797,"date":"2026-07-15T13:37:46","date_gmt":"2026-07-15T05:37:46","guid":{"rendered":"https:\/\/www.clirik.com\/?p=9797"},"modified":"2026-09-18T18:14:01","modified_gmt":"2026-09-18T10:14:01","slug":"consejos-de-expertos-sobre-piezas-de-mantenimiento-para-molinos-de-rodillos-verticales","status":"publish","type":"post","link":"https:\/\/www.clirik.com\/es\/consejos-de-expertos-sobre-piezas-de-mantenimiento-para-molinos-de-rodillos-verticales\/","title":{"rendered":"Mantenimiento y recambios del molino de rodillos vertical: consejos de expertos"},"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\"><br>Para realizar correctamente el mantenimiento diario de los molinos verticales (molinos verticales), son indispensables estos tres pasos: un control preciso de la tensi\u00f3n hidr\u00e1ulica, un centrado perfecto de los discos de molienda y el rectificado previo de las piezas resistentes al desgaste para estabilizar el lecho de material. Si no se comprende primero la ley del desgaste y se limitan a sustituir a ciegas las piezas de recambio est\u00e1ndar, el resultado no ser\u00e1 m\u00e1s que frecuentes sacudidas por vibraciones y paradas, lo que supondr\u00e1 un desperdicio de costes operativos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Muchas f\u00e1bricas de cemento y empresas mineras hacen la vista gorda ante las \u201cmicrovibraciones\u201d diarias, y a menudo se pierden beneficios de forma imperceptible hasta que el cojinete queda completamente inservible. De hecho, m\u00e1s de 60% de molinos verticales se detienen repentinamente; la causa principal es una valoraci\u00f3n err\u00f3nea de la ca\u00edda de presi\u00f3n del acumulador hidr\u00e1ulico, y no la fluctuaci\u00f3n de las materias primas. Esta gu\u00eda t\u00e9cnica le proporcionar\u00e1 un conjunto detallado de especificaciones operativas precisas basadas en datos que le ayudar\u00e1n a estabilizar el funcionamiento del molino, prolongar la vida \u00fatil de sus piezas y reducir significativamente los tiempos de inactividad no planificados durante el pr\u00f3ximo trimestre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_P-A-W_Triangle_Rule_A_Framework_For_Vertical_Mill_Optimization\"><\/span>La regla del tri\u00e1ngulo P-A-W: un marco para la optimizaci\u00f3n de las fresadoras verticales<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En lo que respecta al mantenimiento de las fresadoras verticales, la clave reside en un cambio de mentalidad: pasar de una respuesta pasiva de \u201creparaci\u00f3n de aver\u00edas\u201d a una supervisi\u00f3n activa basada en la predicci\u00f3n a partir de datos de referencia. Los directores de f\u00e1brica con m\u00e1s experiencia del sector suelen seguir una regla fundamental: el tri\u00e1ngulo P-A-W (presi\u00f3n, centrado y desgaste).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Presi\u00f3n (Pressure): La presi\u00f3n hidr\u00e1ulica de molienda debe ajustarse perfectamente al \u00edndice de molturabilidad del material. Un exceso de presi\u00f3n da\u00f1ar\u00e1 directamente el cojinete, mientras que una presi\u00f3n insuficiente har\u00e1 que el lecho de material resulte extremadamente inestable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CENTRADO (Alineaci\u00f3n): Aunque solo haya una desalineaci\u00f3n de 2 mm entre el rodillo de rectificado y la mesa del disco de rectificado, la fuerza de cizallamiento se ver\u00e1 completamente alterada, lo que reducir\u00e1 considerablemente la eficiencia del rectificado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Desgaste: Aseg\u00farate de prestar especial atenci\u00f3n a la tasa de desgaste espec\u00edfica (g\/ton) de las piezas de molienda, ya que esta determinar\u00e1 la planificaci\u00f3n de todo tu plan de mantenimiento.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img title=\"Muestra un tri\u00e1ngulo cuyos tres v\u00e9rtices lleven las etiquetas &quot;Presi\u00f3n&quot;, &quot;Alineaci\u00f3n&quot; y &quot;Desgaste&quot;, y cuyo centro lleve la etiqueta &quot;Estabilidad del molino&quot;.&quot;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-1024x576.png\" alt=\"Muestra un tri\u00e1ngulo cuyos tres v\u00e9rtices lleven las etiquetas &quot;Presi\u00f3n&quot;, &quot;Alineaci\u00f3n&quot; y &quot;Desgaste&quot;, y cuyo centro lleve la etiqueta &quot;Estabilidad del molino&quot;.&quot;\" class=\"wp-image-9827\" srcset=\"https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-1024x576.png 1024w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-300x169.png 300w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-768x432.png 768w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-1536x864.png 1536w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910-18x10.png 18w, https:\/\/www.clirik.com\/wp-content\/uploads\/2026\/07\/pasted-image-20260715-034900-910.png 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Siempre que estos tres elementos mantengan un equilibrio, se podr\u00e1 prevenir eficazmente el tipo de fatiga estructural que se produce por la acumulaci\u00f3n de piezas pesadas del molino.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Core_Components_Inspection_Specification\"><\/span>Componentes principales: Especificaciones de inspecci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Una vez que los componentes del molino de materia prima o del molino de escoria dejan de funcionar correctamente, la fuerza destructiva se propaga r\u00e1pidamente de forma radial. Por ejemplo, si la pala gu\u00eda del rotor de la m\u00e1quina de selecci\u00f3n de polvo est\u00e1 desgastada, la granulometr\u00eda de las part\u00edculas se alterar\u00e1, lo que obligar\u00e1 al molino a funcionar sobrecargado, lo que a su vez acelera el desgaste del rodillo de molienda. La inspecci\u00f3n diaria a simple vista o al tacto simplemente no permite detectar los da\u00f1os por fatiga en el interior del material. Los ingenieros de equipos deben hacer un uso eficaz de la detecci\u00f3n de defectos por ultrasonidos y la caracterizaci\u00f3n de vibraciones.<\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"771\" height=\"260\" src=\"https:\/\/www.youtube.com\/embed\/zYfFhjY9Gdg\" title=\"Recubrimiento de dureza de un rodillo de molino vertical\" 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<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Roller_And_Disc_Liners_A_Surfacing_Strategy\"><\/span>Revestimientos de rodillos y discos: una estrategia de pavimentaci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Los rodillos de molienda y los revestimientos de los discos de molienda se ven sometidos a tensiones mec\u00e1nicas extremas a diario. Muchos operarios se empe\u00f1an en esperar a que quede al descubierto el material base antes de programar el mantenimiento, lo cual es un tab\u00fa en el \u00e1mbito militar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lo mejor es programar inmediatamente la soldadura de recubrimiento en l\u00ednea cuando la profundidad de desgaste alcance el valor l\u00edmite 60% establecido por el fabricante. Si el metal base ha sufrido da\u00f1os graves, es f\u00e1cil que se produzcan grietas en caliente si se procede a soldar en ese momento. Se recomienda utilizar una regla de muestreo est\u00e1ndar para medir el perfil de desgaste del manguito del rodillo cada semana. Si se observa que la superficie del rodillo presenta diferentes profundidades de desgaste en el sentido de la anchura, suele significar que la presi\u00f3n de nitr\u00f3geno en el resorte de gas l\u00edquido es incorrecta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Hydraulic_Tensioning_System_How_To_Prevent_Accumulator_Failure\"><\/span>Sistema de tensado hidr\u00e1ulico: c\u00f3mo evitar aver\u00edas en el acumulador<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Se puede decir que el sistema hidr\u00e1ulico es el \u201camortiguador\u201d de toda la f\u00e1brica. En cuanto se rompe la vejiga del acumulador de nitr\u00f3geno, la f\u00e1brica comienza inmediatamente a vibrar violentamente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. En invierno, los operarios de mantenimiento son especialmente propensos a cometer errores, al confundir la ca\u00edda de presi\u00f3n del acumulador con una fuga de aire en la bolsa de aire. Hay que tener en cuenta que la presi\u00f3n del nitr\u00f3geno disminuir\u00e1 en la misma proporci\u00f3n en que baje la temperatura ambiente. Por lo tanto, antes de precipitarse a comprar una nueva bolsa o desmontar el bloque de v\u00e1lvulas hidr\u00e1ulicas, aseg\u00farese de recalibrar la lectura de presi\u00f3n 1 vez consultando la tabla de variaciones de temperatura ambiente.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advanced_Maintenance_Beware_Of_The_%E2%80%9CFalse_Brinell_Indentation%E2%80%9D_Trap\"><\/span>Mantenimiento avanzado: cuidado con la trampa de la \u201cfalsa hendidura de Brinell\u201d<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Los largos periodos de inactividad de toda la planta suelen ocultar factores ocultos que ponen en peligro los equipos rotativos pesados. La \u201cfalsa indentaci\u00f3n de Brinell\u201d es uno de los fen\u00f3menos de deterioro de los rodamientos m\u00e1s dif\u00edciles de detectar, que puede destruir silenciosamente los rodamientos de los rodillos de molienda antes de que se vuelva a poner en marcha el molino.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cuando el molino vertical se detiene durante unas semanas (por ejemplo, cuando se realiza una revisi\u00f3n general del horno rotatorio o cuando se detiene el horno en diferentes picos de actividad durante el invierno), las vibraciones ambientales generadas por los ventiladores y las trituradoras que siguen funcionando junto a \u00e9l se transmiten al molino parado a trav\u00e9s de los cimientos. En ese momento, el rodamiento del rodillo de molienda se ha quedado atascado en una posici\u00f3n y la pel\u00edcula protectora de aceite interna se ha secado por la compresi\u00f3n. Esas peque\u00f1as sacudidas pueden provocar un molido en seco directo entre los metales y, finalmente, la aparici\u00f3n de picaduras permanentes en las pistas de rodadura del rodamiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La soluci\u00f3n es muy sencilla: durante cualquier parada prolongada, el equipo de mantenimiento debe girar manualmente la placa de molienda y el rodillo de molienda 90 grados cada 48 horas. Una acci\u00f3n tan sencilla permite redistribuir el aceite lubricante, evitar da\u00f1os localizados en la pista de rodadura y ahorrarte miles de dinero que no deber\u00edas haber gastado.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Troubleshooting_Severe_Vibration\"><\/span>Soluci\u00f3n de problemas relacionados con vibraciones intensas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La vibraci\u00f3n es el indicador definitivo del estado de un molino. Si solo se tiene en cuenta la velocidad de vibraci\u00f3n global (mm\/s), es f\u00e1cil dejarse llevar por fen\u00f3menos superficiales que ocultan fallos espec\u00edficos de los componentes.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Condiciones de funcionamiento<\/td><td>Firma vibratoria<\/td><td>Causa probable<\/td><td>Medidas inmediatas<\/td><\/tr><tr><td><strong>Tabla vac\u00eda<\/strong><\/td><td>Vibraciones err\u00e1ticas y de gran amplitud (retumbar repentino y violento)<\/td><td>P\u00e9rdida de la profundidad del lecho de material, lo que provoca un contacto directo entre el metal de los rodillos de molienda y la mesa.<\/td><td>Aumente la velocidad de alimentaci\u00f3n y ajuste inmediatamente la pulverizaci\u00f3n de agua para reconstruir el lecho de material; detenga el molino si se superan los l\u00edmites de vibraci\u00f3n.<\/td><\/tr><tr><td><strong>Hierro de desecho<\/strong><\/td><td>Picos bruscos, repentinos y peri\u00f3dicos de gran impacto<\/td><td>Cuerpos extra\u00f1os met\u00e1licos resistentes a la trituraci\u00f3n que pasan por debajo de los rodillos trituradores.<\/td><td>Detenga inmediatamente el molino, a\u00edsle el equipo y localice y retire manualmente los residuos met\u00e1licos.<\/td><\/tr><tr><td><strong>P\u00e9rdida de nitr\u00f3geno<\/strong><\/td><td>Saltos fuertes y continuos y resonancia de baja frecuencia de los rodillos<\/td><td>Rotura de la vejiga o fuga de gas en los acumuladores hidr\u00e1ulicos, lo que provoca una p\u00e9rdida total de la absorci\u00f3n de impactos y la amortiguaci\u00f3n.<\/td><td>Apague la planta, compruebe las presiones de los acumuladores, sustituya las c\u00e1maras de aire da\u00f1adas y rellene con nitr\u00f3geno hasta los niveles especificados.<\/td><\/tr><tr><td><strong>Desequilibrio en el clasificador<\/strong><\/td><td>Vibraci\u00f3n arm\u00f3nica intensa y constante a la velocidad de funcionamiento 1X del rotor del separador<\/td><td>Acumulaci\u00f3n irregular de material, desgaste grave o cuchillas da\u00f1adas o faltantes en el rotor del clasificador.<\/td><td>Detenga el clasificador, limpie a fondo las palas del rotor, compruebe que no presenten da\u00f1os f\u00edsicos y realice un equilibrado din\u00e1mico si es necesario.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Los ingenieros deben aprender a analizar los espectrogramas. Las vibraciones de baja frecuencia suelen ser una se\u00f1al de advertencia: el lecho de material es inestable o hay metal extra\u00f1o (hierro) mezclado en el molino. Los picos que aparecen en el segmento de alta frecuencia se deben casi siempre a defectos en la superficie de los cojinetes o a problemas de engranaje en los engranajes del reductor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Datos de un caso real: una l\u00ednea de producci\u00f3n de cemento de 5.000 toneladas al d\u00eda presenta picos de vibraci\u00f3n de 12 mm\/s puntualmente todos los martes desde la 1 hasta una hora determinada, que se repiten una y otra vez. Tras realizar un an\u00e1lisis e investigaci\u00f3n de las vibraciones, descubrimos que un punto de resonancia espec\u00edfico coincid\u00eda exactamente con la frecuencia de la bomba hidr\u00e1ulica. Como resultado, bast\u00f3 con sustituir una v\u00e1lvula de alivio $200 y ajustar correctamente el sistema de tensado para que las vibraciones desaparecieran por completo, lo que evit\u00f3 el gasto que supondr\u00eda la sustituci\u00f3n de un cojinete $40 000.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Purchase_Comparison_Of_Original_Factory_Parts_And_Auxililic_Factory_Parts\"><\/span>Comparaci\u00f3n de precios entre recambios originales de f\u00e1brica y recambios de otras marcas<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A la hora de comprar accesorios para molinos verticales, hay que hacer malabarismos para calcular el \u201ccoste de funcionamiento por hora\u201d. Si solo te fijas en el bajo precio de compra de esas piezas auxiliares resistentes al desgaste, tarde o temprano te quedar\u00e1s sin presupuesto de mantenimiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Las piezas fundidas, como los manguitos de rodillos y los revestimientos de discos, deben cumplir requisitos metalogr\u00e1ficos extremadamente estrictos (normalmente, hierro fundido blanco con alto contenido en cromo). Solo as\u00ed pueden soportar impactos locales violentos. Las piezas auxiliares de f\u00e1brica de baja calidad suelen presentar irregularidades durante la fundici\u00f3n y el enfriamiento, y su interior est\u00e1 plagado de diminutos poros de contracci\u00f3n. En cuanto se ven sometidas al rectificado a alta presi\u00f3n del sistema hidr\u00e1ulico, se rompen directamente y se convierten en escoria. Las piezas auxiliares se pueden comprar, pero lim\u00edtate a aquellas zonas que no sean cr\u00edticas, como las tuber\u00edas de agua externas, los pernos est\u00e1ndar y las juntas auxiliares. En cuanto a las piezas de tensi\u00f3n del n\u00facleo y de rectificado, aseg\u00farate de que sean de la misma calidad que las piezas originales (OEM) o de una gran f\u00e1brica de primera l\u00ednea certificada.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQ\"><\/span>Preguntas frecuentes (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u00bfCon qu\u00e9 frecuencia hay que rectificar los rodillos de molienda verticales?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">El ciclo de recubrimiento depende totalmente del grado de \u201cabrasividad\u201d de las materias primas (un alto contenido en s\u00edlice no lo es). En t\u00e9rminos generales, el rodillo de trituraci\u00f3n del molino de escoria debe soldarse cada 1.500 a 2.000 horas. Si el molino de materias primas tritura piedra caliza blanda, a menudo puede aguantar entre 4.000 y 6.000 horas antes de que sea necesaria una soldadura de reparaci\u00f3n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00bfPor qu\u00e9 la presi\u00f3n de tensado hidr\u00e1ulico desciende repentinamente hasta el m\u00ednimo?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Normalmente hay tres causas posibles cuando la presi\u00f3n desciende bruscamente: o bien ha explotado la bolsa de nitr\u00f3geno del acumulador, o bien ha fallado el anillo de estanqueidad del cilindro hidr\u00e1ulico, o bien se ha atascado la v\u00e1lvula de alivio proporcional. Si se produce esta situaci\u00f3n, comprueba inmediatamente la presi\u00f3n de precarga del acumulador.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00bfPor qu\u00e9 vibraba tanto el molino vertical cuando se puso en marcha por primera vez?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Al principio, la vibraci\u00f3n se deb\u00eda a que la capa de material no se hab\u00eda extendido ni estabilizado por completo. Pero si la vibraci\u00f3n es constante, hay que comprobar si no se est\u00e1 pulverizando suficiente agua, si no hay material en el espacio del disco de esmerilado o si la presi\u00f3n de tensi\u00f3n inicial est\u00e1 mal ajustada.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Est\u00e1 gastado. \u00bfPuedo cambiar solo uno de los manguitos de los tres rodillos de esmerilado?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Por supuesto que no. Cambiar solo un manguito de rodillo provocar\u00e1 un grave desequilibrio mec\u00e1nico. El di\u00e1metro y el perfil de desgaste del nuevo manguito de rodillo no se corresponden en absoluto con los de los antiguos, lo que provocar\u00e1 una presi\u00f3n de trituraci\u00f3n unilateral. No solo el impacto ser\u00e1 grave, sino que el reductor quedar\u00e1 inservible en poco tiempo. Recuerda la raz\u00f3n fundamental: ya sea para su sustituci\u00f3n o para su recubrimiento, los rodillos de molienda deben fabricarse todos a la vez.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00bfCu\u00e1l es la temperatura normal de funcionamiento del rodamiento de rodillos del molino vertical?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Las temperaturas para un funcionamiento continuo normal suelen oscilar entre los 65 \u00b0C y los 80 \u00b0C. Si el reloj supera los 90 \u00b0C, no dudes en desactivar el freno de inmediato. En ese momento, es necesario comprobar si se ha interrumpido el suministro de aceite, si la holgura del cojinete es incorrecta o si la junta est\u00e1 rota, lo que provoca la entrada de polvo de harina cruda.<\/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":"This guide covers vertical roller mill maintenance, emphasizing the P-A-W triangle (pressure, alignment, wear), key inspection specs, hydraulic accumulator care, vibration troubleshooting, and part purchasing advice to reduce downtime.","_geo_structured_desc":"The article provides a technical framework for vertical roller mill maintenance, organized around the P-A-W triangle rule: Pressure must match material grindability, Alignment must minimize roller-to-table misalignment (even 2mm matters), and Wear monitoring via specific wear rates (g\/ton) dictates maintenance scheduling. It details core component inspection using ultrasonic flaw detection and vibration characterization rather than routine visual checks. For roller and disc liners, the recommended strategy is online surfacing welding once wear depth reaches 60% of manufacturer limits; weekly wear profile measurements are advised. The hydraulic tensioning system is highlighted as the mill's shock absorber; accumulator failures often cause violent vibration. A common winter mistake is misreading nitrogen pressure drop due to ambient temperature as bladder leakage; recalibrate against temperature before replacing parts. A specific 'false Brinell indentation' risk is explained for long shutdowns: bearing damage from external vibrations when the mill is stationary. Manual rotation of the grinding plate\/roller by 90 degrees every 48 hours prevents this. The article provides a vibration troubleshooting table linking conditions (empty table, tramp iron, nitrogen loss, classifier imbalance) to signatures and actions. It emphasizes analyzing spectrograms to distinguish low-frequency (material bed\/foreign objects) from high-frequency (bearing\/gear) issues, including a real case where a $200 relief valve replacement avoided a $40,000 bearing replacement. Finally, part purchasing advice stresses comparing hourly operating costs, not just purchase price; core components like roller sleeves and disc liners should be OEM or certified quality, while auxiliary parts can be sourced from secondary suppliers.","_geo_faqs":"[{\"question\":\"How often do vertical grinding rollers need to be surfacing?\",\"answer\":\"The surfacing cycle depends on how abrasive the raw materials are. Generally, a slag mill grinding roller must be welded every 1500 to 2000 hours. If a raw material mill processes soft limestone, it can often last 4000 to 6000 hours before repair welding is required.\"},{\"question\":\"Why does the hydraulic tensioning pressure suddenly fall to the bottom?\",\"answer\":\"There are usually three killers when the pressure drops sharply: either the nitrogen bag in the accumulator exploded, the sealing ring of the hydraulic cylinder failed, or the proportional relief valve stuck. You should check the accumulator pre-charge pressure immediately.\"},{\"question\":\"Why did the vertical mill shake so badly when it was first started?\",\"answer\":\"Initial vibration is often due to the material bed not being completely spread out and stabilized. If the shock is endless, check whether there is not enough water spray, whether there is material on the grinding disc, or whether the initial tension pressure is set incorrectly.\"},{\"question\":\"Can I just change one of the roller sleeves in the 3 grinding roller?\",\"answer\":\"Definitely not. Changing only one roller sleeve leads to serious mechanical imbalance. The diameter and wear profile of the new roller sleeve are completely out of line with the old ones, causing one-sided grinding pressure. This leads to severe shock and soon scrapping of the reducer. Whether replacing or surfacing, the grinding rollers must be handled together.\"},{\"question\":\"What is the normal operating temperature of the vertical mill roller bearing?\",\"answer\":\"Normal continuous operation temperatures are typically between 65\u00b0C and 80\u00b0C. Once the temperature soars above 90\u00b0C, switch off and stop immediately. At that point, check whether oil is cut off, bearing clearance is wrong, or seals are broken causing raw meal powder to leak in.\"}]","_geo_key_points":"[\"More than 60% of vertical mill sudden stops are caused by misjudged hydraulic accumulator pressure drop, not raw material fluctuation.\",\"Master the P-A-W triangle: Pressure must match material grindability, Alignment within 2mm, and Wear tracked as specific wear rate in g\\\/ton.\",\"Schedule online surfacing welding when wear depth reaches 60% of the manufacturer's limit; avoid welding after base metal is exposed.\",\"Measure the roller sleeve wear profile weekly; uneven wear in the width direction indicates wrong nitrogen pressure in the liquid gas spring.\",\"During long shutdowns, manually rotate the grinding plate and roller 90 degrees every 48 hours to prevent false Brinell indentations on bearings.\",\"Vibration analysis: low-frequency vibration suggests unstable material bed or tramp metal; high-frequency spikes point to bearing defects or gear meshing problems.\",\"Always replace or resurface all grinding rollers together; changing only one roller sleeve causes mechanical imbalance leading to reducer failure.\",\"Buy OEM or certified first-line factory parts for core tensioning and grinding components; auxiliary factory parts are acceptable only for non-critical items like water pipes and bolts.\",\"Normal vertical mill roller bearing operating temperature is between 65\u00b0C and 80\u00b0C; shut down immediately if it exceeds 90\u00b0C.\",\"Hydraulic tensioning pressure suddenly dropping to bottom indicates nitrogen bag explosion, hydraulic cylinder seal failure, or stuck proportional relief valve.\"]","_geo_target_audience":"Maintenance engineers, equipment managers, and plant operators in cement plants and mining enterprises who operate vertical roller mills and need practical, data-driven guidance on preventive maintenance, vibration troubleshooting, hydraulic system care, wear part management, and cost-effective spare part sourcing to reduce unplanned downtime and extend equipment life.","_geo_content_type":"","_geo_last_modified":"2026-09-09T14:57:30+08:00","_geo_version":2,"themepark_seo_title":"Vertical Roller Mill Maintenance &amp; Parts: Expert Tips - Clirik","themepark_seo_description":"","footnotes":""},"categories":[23],"tags":[],"class_list":["post-9797","post","type-post","status-publish","format-standard","hentry","category-blog"],"metadata":{"_edit_lock":["1789726442:4"],"rank_math_primary_category":["23"],"rank_math_seo_score":["13"],"_edit_last":["4"],"themepark_seo_title":["Vertical Roller Mill Maintenance &amp; Parts: Expert Tips - Clirik"],"themepark_seo_description":[""],"themepark_seo_keyword":["Raymond Mill ,Raymond Coal Mill ,Raymond Mill Working Principle"],"catce":["sidebar-widgets4"],"views":["867"],"rank_math_og_content_image":["a:2:{s:5:\"check\";s:32:\"f57a7f91c1fa5863ba0b2de69e7c3ce3\";s:6:\"images\";a:1:{i:0;i:9827;}}"],"_geo_short_summary":["This guide covers vertical roller mill maintenance, emphasizing the P-A-W triangle (pressure, alignment, wear), key inspection specs, hydraulic accumulator care, vibration troubleshooting, and part purchasing advice to reduce downtime."],"_geo_structured_desc":["The article provides a technical framework for vertical roller mill maintenance, organized around the P-A-W triangle rule: Pressure must match material grindability, Alignment must minimize roller-to-table misalignment (even 2mm matters), and Wear monitoring via specific wear rates (g\/ton) dictates maintenance scheduling. It details core component inspection using ultrasonic flaw detection and vibration characterization rather than routine visual checks. For roller and disc liners, the recommended strategy is online surfacing welding once wear depth reaches 60% of manufacturer limits; weekly wear profile measurements are advised. The hydraulic tensioning system is highlighted as the mill's shock absorber; accumulator failures often cause violent vibration. A common winter mistake is misreading nitrogen pressure drop due to ambient temperature as bladder leakage; recalibrate against temperature before replacing parts. A specific 'false Brinell indentation' risk is explained for long shutdowns: bearing damage from external vibrations when the mill is stationary. Manual rotation of the grinding plate\/roller by 90 degrees every 48 hours prevents this. The article provides a vibration troubleshooting table linking conditions (empty table, tramp iron, nitrogen loss, classifier imbalance) to signatures and actions. It emphasizes analyzing spectrograms to distinguish low-frequency (material bed\/foreign objects) from high-frequency (bearing\/gear) issues, including a real case where a $200 relief valve replacement avoided a $40,000 bearing replacement. Finally, part purchasing advice stresses comparing hourly operating costs, not just purchase price; core components like roller sleeves and disc liners should be OEM or certified quality, while auxiliary parts can be sourced from secondary suppliers."],"_geo_faqs":["[{\"question\":\"How often do vertical grinding rollers need to be surfacing?\",\"answer\":\"The surfacing cycle depends on how abrasive the raw materials are. Generally, a slag mill grinding roller must be welded every 1500 to 2000 hours. If a raw material mill processes soft limestone, it can often last 4000 to 6000 hours before repair welding is required.\"},{\"question\":\"Why does the hydraulic tensioning pressure suddenly fall to the bottom?\",\"answer\":\"There are usually three killers when the pressure drops sharply: either the nitrogen bag in the accumulator exploded, the sealing ring of the hydraulic cylinder failed, or the proportional relief valve stuck. You should check the accumulator pre-charge pressure immediately.\"},{\"question\":\"Why did the vertical mill shake so badly when it was first started?\",\"answer\":\"Initial vibration is often due to the material bed not being completely spread out and stabilized. If the shock is endless, check whether there is not enough water spray, whether there is material on the grinding disc, or whether the initial tension pressure is set incorrectly.\"},{\"question\":\"Can I just change one of the roller sleeves in the 3 grinding roller?\",\"answer\":\"Definitely not. Changing only one roller sleeve leads to serious mechanical imbalance. The diameter and wear profile of the new roller sleeve are completely out of line with the old ones, causing one-sided grinding pressure. This leads to severe shock and soon scrapping of the reducer. Whether replacing or surfacing, the grinding rollers must be handled together.\"},{\"question\":\"What is the normal operating temperature of the vertical mill roller bearing?\",\"answer\":\"Normal continuous operation temperatures are typically between 65\u00b0C and 80\u00b0C. Once the temperature soars above 90\u00b0C, switch off and stop immediately. At that point, check whether oil is cut off, bearing clearance is wrong, or seals are broken causing raw meal powder to leak in.\"}]"],"_geo_key_points":["[\"More than 60% of vertical mill sudden stops are caused by misjudged hydraulic accumulator pressure drop, not raw material fluctuation.\",\"Master the P-A-W triangle: Pressure must match material grindability, Alignment within 2mm, and Wear tracked as specific wear rate in g\\\/ton.\",\"Schedule online surfacing welding when wear depth reaches 60% of the manufacturer's limit; avoid welding after base metal is exposed.\",\"Measure the roller sleeve wear profile weekly; uneven wear in the width direction indicates wrong nitrogen pressure in the liquid gas spring.\",\"During long shutdowns, manually rotate the grinding plate and roller 90 degrees every 48 hours to prevent false Brinell indentations on bearings.\",\"Vibration analysis: low-frequency vibration suggests unstable material bed or tramp metal; high-frequency spikes point to bearing defects or gear meshing problems.\",\"Always replace or resurface all grinding rollers together; changing only one roller sleeve causes mechanical imbalance leading to reducer failure.\",\"Buy OEM or certified first-line factory parts for core tensioning and grinding components; auxiliary factory parts are acceptable only for non-critical items like water pipes and bolts.\",\"Normal vertical mill roller bearing operating temperature is between 65\u00b0C and 80\u00b0C; shut down immediately if it exceeds 90\u00b0C.\",\"Hydraulic tensioning pressure suddenly dropping to bottom indicates nitrogen bag explosion, hydraulic cylinder seal failure, or stuck proportional relief valve.\"]"],"_geo_target_audience":["Maintenance engineers, equipment managers, and plant operators in cement plants and mining enterprises who operate vertical roller mills and need practical, data-driven guidance on preventive maintenance, vibration troubleshooting, hydraulic system care, wear part management, and cost-effective spare part sourcing to reduce unplanned downtime and extend equipment life."],"_geo_manual_overrides":["[\"_geo_short_summary\",\"_geo_structured_desc\",\"_geo_faqs\",\"_geo_key_points\",\"_geo_target_audience\"]"],"_geo_last_modified":["2026-09-09T14:57:30+08:00"],"_geo_version":["2"],"_geo_has_data":["1"],"_geo_ai_search_text":["Vertical Roller Mill Maintenance &amp; Parts: Expert Tips\nThis guide details vertical roller mill maintenance using the P-A-W triangle (Pressure, Alignment, Wear), offering data-driven inspection specs, surfacing strategies, hydraulic accumulator troubleshooting, and severe vibration diagnostics to reduce downtime.\nThe article provides a technical framework for optimizing vertical roller mill maintenance and preventing unplanned downtime.\n\n**Core Framework: P-A-W Triangle**\nMaintenance must shift from reactive repair to proactive monitoring based on three balanced pillars: Pressure (hydraulic force matched to material grindability), Alignment (grinding roller and disc alignment, noting that even 2mm misalignment reduces efficiency), and Wear (tracking specific wear rate g\/ton of grinding parts).\n\n**Inspection and Surfacing**\nCritical components require advanced inspection methods like ultrasonic flaw detection and vibration characterization, as visual\/tactile checks miss internal fatigue. For grinding rollers and disc liners, schedule online surfacing welding when wear reaches 60% of manufacturer's limit; avoid welding after base material is exposed to prevent hot cracks. Weekly measurement of roller wear profiles is recommended, noting uneven wear in width direction points to incorrect nitrogen pressure in the liquid gas spring.\n\n**Hydraulic Tensioning System**\nThe hydraulic system acts as the mill's shock absorber. Accumulator bladder rupture causes violent vibration. In winter, distinguish normal nitrogen pressure drop from air leakage: nitrogen pressure decreases proportionally with ambient temperature. Always recalibrate pressure readings against ambient temperature change before replacing parts.\n\n**False Brinell Indentation**\nDuring long shutdowns (over weeks), ambient vibration from nearby fans\/crushers transmitted to the stationary mill can cause dry grinding in stationary grinding roller bearings, leading to permanent pits called \"False Brinell indentation.\" Prevention: manually rotate the grinding disc and rollers 90 degrees every 48 hours during any long shutdown.\n\n**Troubleshooting Severe Vibration**\nVibration is a health barometer; analyze spectrograms rather than just overall vibration speed. The article includes a table correlating operating conditions:\n- Empty table: erratic high-amplitude vibrations; rebuild material bed by increasing feed\/water spray.\n- Tramp iron: sharp periodic spikes; stop mill and remove metal.\n- Nitrogen loss: continuous heavy bouncing; inspect\/recharge accumulator.\n- Classifier imbalance: harmonic vibration at 1X rotor speed; clean\/inspect rotor blades.\n\nLow-frequency vibration often indicates unstable material bed or tramp metal; high-frequency spikes point to bearing defects or gear meshing problems. A real case: a 5000 t\/day line had scheduled vibration spikes every Tuesday, traced to resonance with hydraulic pump frequency, solved by a $200 relief valve replacement instead of $40,000 bearing replacement.\n\n**Parts Purchasing**\nAnalyze hourly operating cost, not just purchase price. Core wear parts (roller sleeves, disc liners) require high-chromium white cast iron with strict metallographic standards; inferior auxiliary parts may have shrinkage holes and fail. Buy ancillary parts (water pipes, bolts, seals) from auxiliary factories, but core grinding\/tension parts must be OEM or certified first-tier.\n\n**FAQ Highlights**\n- Surfacing intervals: slag mill rollers every 1500-2000 hours, raw mill processing soft limestone every 4000-6000 hours.\n- Sudden hydraulic pressure drop causes include accumulator bag rupture, seal failure, or proportional relief valve sticking; check pre-charge first.\n- Vibration at start is often material bed instability; check water spray and tension settings.\n- Do not replace only one roller sleeve of multiple rollers - causes imbalance and reducer failure; replace or surface all rollers together.\n- Normal bearing temperatures 65-80\u00b0C; shut down immediately above 90\u00b0C.\nUse the P-A-W triangle: Pressure, Alignment, Wear must be balanced to prevent structural fatigue. Inspect wear parts with ultrasonic flaw detection and vibration characterization, not just visual\/touch checks. Perform online surfacing welding when wear depth reaches 60% of manufacturer's limit, before base metal is exposed. Uneven roller wear in width direction signals wrong nitrogen pressure in the liquid gas spring. In cold weather, recalibrate accumulator pressure against ambient temperature before assuming bladder failure. Prevent False Brinell indentation by manually rotating grinding plates and rollers 90 degrees every 48 hours during long shutdowns. Analyze vibration spectrograms: low-frequency issues often mean material bed or tramp metal; high-frequency spikes mean bearing or gear problems. Calculate hourly operating cost when buying parts; core grinding and tension components should be OEM or certified first-line, not cheap auxiliary parts. Replace or resurface all grinding rollers together; never change only one roller sleeve. Normal bearing operating temperature is 65\u201380\u00b0C; if above 90\u00b0C, trip mill immediately and inspect lubrication and seals.\nHow often do vertical grinding rollers need to be surfacing?\nThe surfacing cycle depends on material abrasiveness (e.g., silica content). For slag mills, the grinding roller typically requires surfacing welding every 1500 to 2000 hours. For raw material mills processing soft limestone, it can last 4000 to 6000 hours before repair welding is needed.\nWhy does the hydraulic tensioning pressure suddenly fall to the bottom?\nThere are usually 3 causes for a sharp pressure drop: the nitrogen bag inside the accumulator exploded, the sealing ring of the hydraulic cylinder failed, or the proportional relief valve stuck. Immediately check the accumulator pre-charge pressure to diagnose the issue.\nWhy did the vertical mill shake so badly when it was first started?\nInitial vibration is often because the material bed has not fully spread out and stabilized. If shock continues, check for insufficient water spray, empty or uneven material on the grinding disc, or incorrect initial tension pressure settings.\nCan I just change one of the roller sleeves in the 3 grinding rollers?\nNo. Changing only one roller sleeve leads to serious mechanical imbalance because the new sleeve's diameter and wear profile differ from the old ones. This causes one-sided grinding pressure, severe shock, and can soon damage the reducer. Always replace or resurface all rollers together.\nWhat is the normal operating temperature of the vertical mill roller bearing?\nNormal continuous operation temperatures are typically between 65\u00b0C and 80\u00b0C. If the temperature exceeds 90\u00b0C, immediately stop the mill. Then check for oil supply interruption, incorrect bearing clearance, or damaged seals that may allow raw meal powder to leak in.\nMaintenance engineers, plant managers, and operations teams in cement and mining industries who operate vertical roller mills and need practical, data-driven guidance on preventive maintenance, troubleshooting vibration, hydraulic system care, and spare parts selection to reduce unplanned downtime and extend equipment life."],"_wp_page_template":["default"]},"views":867,"medium_url":false,"thumbnail_url":false,"full_url":false,"_links":{"self":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9797","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=9797"}],"version-history":[{"count":1,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9797\/revisions"}],"predecessor-version":[{"id":9829,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/posts\/9797\/revisions\/9829"}],"wp:attachment":[{"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/media?parent=9797"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/categories?post=9797"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.clirik.com\/es\/wp-json\/wp\/v2\/tags?post=9797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}