{"id":9797,"date":"2026-07-15T13:37:46","date_gmt":"2026-07-15T05:37:46","guid":{"rendered":"https:\/\/www.clirik.com\/?p=9797"},"modified":"2026-07-15T13:37:48","modified_gmt":"2026-07-15T05:37:48","slug":"vertical-roller-mill-maintenance-parts-expert-tips","status":"publish","type":"post","link":"https:\/\/www.clirik.com\/es\/vertical-roller-mill-maintenance-parts-expert-tips\/","title":{"rendered":"Vertical Roller Mill Maintenance &amp; Parts: Expert Tips"},"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>In order to do a good job in the daily maintenance of vertical mills (vertical mills), these 3 steps are indispensable: accurate hydraulic tensioning control, tight-fitting centering of grinding discs, and surfacing of wear-resistant parts in advance to stabilize the material bed. If you don&#8217;t understand the wear law first, just blindly replace standard spare parts, the result will only be frequent vibration jumps and stops, wasting operating costs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many cement plants and mining enterprises turn a blind eye to the daily &#8220;micro-vibration&#8221;, and profits are often lost quietly until the bearing is completely scrapped. In fact, more than 60% of vertical mills stop suddenly, the root cause is the misjudgment of the pressure drop of hydraulic accumulator, not the fluctuation of raw materials. This technical guide will provide you with a detailed set of precise data-based operating specifications to help you stabilize the mill operation, extend the life of your parts, and significantly reduce unplanned downtime in the next quarter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The P-A-W Triangle Rule: A Framework For Vertical Mill Optimization<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Playing with vertical mill maintenance, the key lies in the change of thinking-from the passive response of &#8220;bad repair&#8221; to active monitoring based on benchmark data prediction. The most experienced factory managers in the industry tend to follow a core rule: the P-A-W triangle (pressure, centering, wear).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pressure (Pressure): The hydraulic grinding pressure must be perfectly matched with the grindability index of the material. Excess pressure will directly destroy the bearing, and insufficient pressure will make the material bed extremely unstable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CENTERING (Alignment): Even if there is only a 2mm misalignment between the grinding roller and the grinding disc roller table, the shear force will be completely changed, greatly reducing the grinding efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Wear: Be sure to focus on the specific wear rate (&nbsp;g\/ton&nbsp;) of the grinding parts, which will determine the scheduling of your entire maintenance plan.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img 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=\"Display A Triangle With Its Three Vertices Labeled &quot;Pressure,&quot; &quot;Alignment,&quot; And &quot;Wear,&quot; And The Center Labeled &quot;Mill Stability.&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\">As long as these three can maintain a balance, it can effectively prevent the kind of accumulation of heavy mill parts of the structural fatigue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Core Components: Inspection Specification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Once the components in the raw mill or slag mill are out of order, the destructive force is rapidly spreading radially. For example, if the rotor guide blade of the powder selecting machine is worn out, the particle gradation will be disorderly set, forcing the mill to run overloaded, which in turn accelerates the scrapping of the grinding roller. Daily use of the eye, hand touch simply do not detect the fatigue damage within the material. Equipment engineers must make real use of ultrasonic flaw detection and vibration characterization.<\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"771\" height=\"260\" src=\"https:\/\/www.youtube.com\/embed\/zYfFhjY9Gdg\" title=\"Hardfacing a Vertical Mill Roller\" 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\">Roller And Disc Liners: A Surfacing Strategy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Grinding rollers and grinding disc liners are subjected to extreme mechanical stresses on a daily basis. Many operators are determined to wait until the base material is exposed before arranging maintenance, which is a military taboo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is best to arrange online surfacing welding immediately when the wear depth reaches 60% of the manufacturer&#8217;s limit value. If the base metal has been severely damaged, it is easy to cause hot cracks if you go to the top for welding at this time. It is recommended to take a standard sample ruler to measure the wear profile of the roller sleeve every week. If it is found that the roller surface is worn in different depths in the width direction, it usually means that the nitrogen pressure in the liquid gas spring is wrong.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hydraulic Tensioning System: How To Prevent Accumulator Failure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The hydraulic system can be said to be the &#8220;shock absorber&#8221; of the entire mill &#8220;. Once the bladder inside the nitrogen accumulator ruptures, the mill immediately bursts into violent vibration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1 in winter, maintenance workers are especially prone to make oolong, mistaking the pressure drop of the accumulator for air leakage in the skin bag. It should be known that the nitrogen pressure will decrease in the same proportion as the ambient temperature decreases. Therefore, before rushing to purchase a new bag or disassemble the hydraulic valve block, be sure to recalibrate the pressure reading 1 times against the ambient temperature change table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Advanced Maintenance: Beware Of The &#8220;False Brinell Indentation&#8221; Trap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The long downtime of the whole plant often hides hidden killers that endanger heavy rotary equipment. &#8220;False Brinell indentation&#8221; is one of the extremely difficult bearing degradation phenomena, which can quietly destroy the grinding roller bearings before the mill is re-ignited.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the vertical mill stops for a few weeks (for example, when the rotary kiln is overhauled or the kiln is stopped at different peaks in winter), the environmental vibration generated by the fans and crushers that are still running next to it will be transmitted to the stationary mill along the foundation. At this time, the grinding roller bearing has been stuck in one position, and the internal protective oil film has been squeezed dry. Those tiny jitters can lead to direct dry grinding between the metals and finally permanent pits on the bearing raceways.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How to solve it is very simple: during any long-term shutdown, the maintenance team must manually turn the grinding plate and grinding roller 90 degrees every 48 hours. Such a small action can redistribute the lubricating oil, avoid local damage to the raceway, and save you thousands of money that should not have been spent.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Troubleshooting Severe Vibration<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vibration is the ultimate barometer of mill health. If you only stare at the overall vibration speed (mm\/s), it is easy to be covered by surface phenomena to cover up specific component failures.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Operating Condition<\/td><td>Vibration Signature<\/td><td>Probable Cause<\/td><td>Immediate Action<\/td><\/tr><tr><td><strong>Empty table<\/strong><\/td><td>Erratic, high-amplitude vibrations (sudden violent rumbling)<\/td><td>Loss of material bed depth resulting in direct metal-to-metal contact between the grinding rollers and the table.<\/td><td>Increase feed rate and adjust water spray immediately to rebuild the material bed; trip the mill if vibration limits are exceeded.<\/td><\/tr><tr><td><strong>Tramp iron<\/strong><\/td><td>Sharp, sudden, and periodic high-impact spikes<\/td><td>Uncrushable metal foreign objects passing under the grinding rollers.<\/td><td>Stop the mill immediately, isolate the equipment, and manually locate and remove the tramp metal.<\/td><\/tr><tr><td><strong>Nitrogen loss<\/strong><\/td><td>Continuous heavy bouncing and low-frequency resonance of the rollers<\/td><td>Ruptured bladder or gas leak in hydraulic accumulators, resulting in a complete loss of shock absorption and damping.<\/td><td>Shut down the mill, inspect accumulator pressures, replace damaged bladders, and recharge nitrogen to specified levels.<\/td><\/tr><tr><td><strong>Classifier imbalance<\/strong><\/td><td>Strong, steady harmonic vibration at the 1X running speed of the separator rotor<\/td><td>Uneven material build-up, severe wear, or damaged\/missing blades on the classifier rotor.<\/td><td>Stop the classifier, thoroughly clean the rotor blades, inspect for physical damage, and perform dynamic balancing if necessary.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers must learn to analyze spectrograms. Low-frequency vibration is usually to warn you: the material bed is unstable, or foreign metal iron mixed into the mill. The spikes that appear in the high frequency segment are almost firmly directed to the bearing surface defects or the meshing problems of the reducer gears.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Real case data: a 5000-ton\/day cement production line will have 12 mm\/s vibration spikes on time every Tuesday from 1 to time, repeated over and over again. After vibration analysis and investigation, we found that a specific resonance point just coincides with the frequency of the hydraulic pump. As a result, only a $200 relief valve was replaced, the tensioning system was honest, the vibration completely disappeared, and a $40,000 bearing replacement fee was simply stopped.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Purchase Comparison Of Original Factory Parts And Auxililic Factory Parts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When purchasing vertical mill accessories, you must break your fingers to calculate the &#8220;hourly operating cost&#8221; account. Just staring at the cheap purchase price to buy those auxiliary factory wear-resistant parts, sooner or later will completely blow through your maintenance budget.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Castings such as roller sleeves and disc liners have extremely strict requirements on metallographic components (usually high-chromium white cast iron). Only in this way can they withstand local violent impacts. Inferior auxiliary factory parts are often uneven during casting and cooling, and the inside is full of tiny shrinkage holes. Once they encounter the high-pressure grinding of the hydraulic system, they are directly broken into slag. Auxiliary parts can be bought, but please leave it to those areas that are not painful, such as external water pipes, standard bolts and auxiliary seals. As for the core tensioning and grinding parts, please be sure to bite as long as the original parts (OEM) or certified first-line large factory genuine.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">How often do vertical grinding rollers need to be surfacing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The surfacing cycle depends entirely on how &#8220;grinding&#8221; the raw materials are (high silica content is not high). Generally speaking, the grinding roller of slag mill must be welded every 1500 to 2000 hours. If the raw material mill eats the soft limestone, it can often hold up for 4000 to 6000 hours before repair welding is required.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why does the hydraulic tensioning pressure suddenly fall to the bottom?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There are usually 3 killers when the pressure drops sharply: either the nitrogen bag in the accumulator exploded, or the sealing ring of the hydraulic cylinder failed, or the proportional relief valve stuck. Encountered this matter, hurriedly check the accumulator pre-charge pressure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why did the vertical mill shake so badly when it was first started?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">At the beginning, the vibration was due to the fact that the material bed had not been completely spread out and stabilized. But if the shock is endless, you have to see if there is not enough water spray, there is no material in space on the grinding disc, or the initial tension pressure is set wrong.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">It&#8217;s worn out. Can I just change one of the roller sleeves in the 3 grinding roller?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Definitely not. Changing only one roller sleeve will lead to serious mechanical imbalance. The diameter and wear profile of the new roller sleeve are completely out of line with those of the old guys, which will lead to one-sided grinding pressure. Not only will the shock be severe, but the reducer will soon be scrapped. Remember the dead reason: whether it is replacement or surfacing, the grinding roller must be made together.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the normal operating temperature of the vertical mill roller bearing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Temperatures for normal continuous operation are typically between 65\u00b0C and 80\u00b0C. Once the watch has soared above 90\u00b0C, don&#8217;t hesitate to switch off the brake immediately. At this time, it is necessary to check whether the oil is cut off, the bearing clearance is wrong, or the seal is broken, causing the raw meal powder to leak in.<\/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":"","_geo_structured_desc":"","_geo_faqs":"","_geo_key_points":"","_geo_target_audience":"","_geo_content_type":"","_geo_last_modified":"","_geo_version":0,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-9797","post","type-post","status-publish","format-standard","hentry","category-blog"],"metadata":{"_edit_lock":["1784173719:4"],"rank_math_primary_category":["23"],"rank_math_seo_score":["13"],"_edit_last":["4"],"themepark_seo_title":["Vertical Roller Mill Maintenance & Parts: Expert Tips"],"themepark_seo_description":["Expert Vertical Roller Mill Maintenance And Parts Tips. Discover The P-A-W Triangle To Prevent Wear And Mill Downtime."],"themepark_seo_keyword":["Raymond Mill ,Raymond Coal Mill ,Raymond Mill Working Principle"],"catce":["sidebar-widgets4"],"views":["32"],"rank_math_og_content_image":["a:2:{s:5:\"check\";s:32:\"f57a7f91c1fa5863ba0b2de69e7c3ce3\";s:6:\"images\";a:1:{i:0;i:9827;}}"]},"views":32,"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}]}}