{"id":2402,"date":"2026-06-30T08:59:01","date_gmt":"2026-06-30T08:59:01","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/cement-equipment-vertical-mill-cylinder\/"},"modified":"2026-06-30T08:59:14","modified_gmt":"2026-06-30T08:59:14","slug":"cement-equipment-vertical-mill-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/hi\/product\/cement-equipment-vertical-mill-cylinder\/","title":{"rendered":"Cement Equipment Vertical Mill Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n
\n
\n Cement Equipment<\/span>
\n Vertical Mill Cylinder<\/span>\n <\/div>\n

Same Spec Sheet.
Different Machine.
Different Engineering.<\/h2>\n

Bore 200\u2013700 mm. Thrust up to 5,387 KN. Stroke \u2264500 mm. Pressure 14 MPa. These numbers are identical to the roller press cylinder (#20). But this cylinder operates on a vertical roller mill \u2014 where the force direction, the grinding geometry, the lever mechanism, and the dual push\/lift requirement are all fundamentally different.<\/p>\n

\n
\n
5,387 KN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
\n
200\u2013700mm<\/span><\/div>\n
Bore<\/div>\n<\/div>\n
\n
Push \u2193<\/div>\n
Grind<\/div>\n<\/div>\n
\n
Lift \u2191<\/div>\n
Maintain \/ Start<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

How a Vertical Roller Mill Grinds \u2014 A Different Geometry Entirely<\/h2>\n

A vertical roller mill (VRM) consists of a horizontal rotating table with 2\u20134 grinding rollers pressed onto it from above. Raw material is fed onto the centre of the table. As the table rotates, centrifugal force throws the material outward \u2014 under the grinding rollers. Each roller, pressed downward by its hydraulic cylinder, crushes the material against the table surface. A dam ring around the table edge retains the material until it is ground fine enough for the hot gas stream to carry it upward to the classifier above the rollers.<\/p>\n

The vertical mill cylinder pushes each roller downward onto the material bed \u2014 but not directly. The roller is mounted on a rocker arm (a lever that pivots on the mill housing). The cylinder pushes one end of the rocker arm; the roller is at the other end. This lever mechanism multiplies the cylinder’s force and converts horizontal cylinder thrust into the vertical grinding force on the roller. Korea Ever-Power manufactures vertical mill cylinders as part of the industrial engineering hydraulic cylinder<\/a> programme.<\/p>\n

\"Cement
\n<\/section>\n

<\/p>\n

\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nCement Equipment Vertical Mill Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nPress grinding rollers onto the table \/ Lift rollers for maintenance<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n200 mm \u2013 700 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n130 mm \u2013 500 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 500 mm<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n5,387 KN (bore 700 mm \/ pressure 14 MPa)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 14 MPa<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

\n

Same Cylinder Specs \u2014 Different Machine, Different Duty<\/h2>\n

The vertical mill cylinder and the roller press cylinder<\/a> (#20) share identical bore, rod, stroke, and thrust ranges. But the machines they serve are fundamentally different \u2014 and the engineering challenges differ accordingly.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Feature<\/th>\nRoller Press (#20)<\/th>\nVertical Mill (#21)<\/th>\n<\/tr>\n<\/thead>\n
Force direction<\/td>\nHorizontal \u2192\u2190<\/td>\nVertical \u2193 (via rocker arm)<\/td>\n<\/tr>\n
Grinding geometry<\/td>\n2 rollers squeeze material<\/td>\nRollers press onto table<\/td>\n<\/tr>\n
Cylinders per machine<\/td>\n2 (one per side)<\/td>\n2\u20134 (one per roller)<\/td>\n<\/tr>\n
Roller lifting required?<\/td>\nNo (just retract)<\/td>\nYes \u2014 must lift rollers off table<\/td>\n<\/tr>\n
Lever mechanism<\/td>\nDirect push<\/td>\nRocker arm (force multiplication)<\/td>\n<\/tr>\n
Material on table moves by<\/td>\nRoller rotation (driven)<\/td>\nTable rotation + centrifugal force<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

\n

The Rocker Arm \u2014 How a Horizontal Cylinder Produces Vertical Grinding Force<\/h2>\n
\n \"Vertical<\/p>\n

The vertical mill cylinder is typically mounted horizontally or at a shallow angle on the mill housing \u2014 not vertically above the roller. The force conversion from horizontal to vertical happens through a rocker arm: a heavy steel lever that pivots on a bearing mounted on the mill body.<\/p>\n

The cylinder rod connects to one end of the rocker arm. The grinding roller shaft connects to the other end. The pivot is between them. When the cylinder extends, it pushes the rocker arm upward at the cylinder end \u2014 which pushes the roller end downward onto the grinding table. The lever ratio (distance from pivot to cylinder attachment \u00f7 distance from pivot to roller shaft) determines the force multiplication: a 2:1 ratio means the cylinder’s 5,387 KN produces 10,774 KN of vertical grinding force on the roller.<\/p>\n

This rocker arm mechanism is unique to the vertical mill \u2014 the roller press cylinder (#20) pushes the movable roller directly, without any lever mechanism. The rocker arm adds complexity (an additional pivot bearing, a structural lever arm) but provides force multiplication that allows a smaller cylinder to produce the same grinding force \u2014 or the same cylinder to produce significantly more grinding force than the roller press at the same pressure.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n
\n

Dual Function \u2014 Push Down to Grind, Pull Up to Lift<\/h2>\n

The roller press cylinder only needs to push \u2014 retraction simply relieves the grinding force, and the rollers stay in contact with the material by gravity. The vertical mill cylinder must do both: push the rollers down for grinding AND pull the rollers up off the table \u2014 a retraction function that the roller press never needs.<\/p>\n

\n
\n
Push Down \u2014 Grinding Mode<\/strong><\/div>\n
\n

The cylinder extends, pushing the rocker arm \u2014 pressing the roller onto the material bed with a constant hydraulic “spring” force. The same force-control (not position-control) principle as the roller press: the grinding force is set by the hydraulic pressure; the roller height self-adjusts based on material bed thickness. Nitrogen accumulator connected for shock absorption.<\/p>\n<\/div><\/div>\n

\n
Pull Up \u2014 Roller Lift Mode<\/strong><\/div>\n
\n

The cylinder retracts, pulling the rocker arm \u2014 lifting the roller off the table surface by 50\u2013150 mm. Required for: empty-mill start-up (rollers must not contact the bare table without a material bed), maintenance inspection of the roller surface and table segments, emergency stop (lift rollers instantly to prevent grinding damage from vibration), and roller replacement (swing roller out after lifting).<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

This dual push\/pull requirement means the vertical mill cylinder must generate meaningful force in both directions \u2014 the retraction force (rod-side annular area \u00d7 pressure) must be enough to lift the roller, the rocker arm, and overcome the roller’s weight component on the rocker geometry. Korea Ever-Power verifies both extend and retract forces during the engineering phase. Contact the hydraulic cylinder engineering team<\/a> for vertical mill cylinder specifications.<\/p>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Vertical
\n<\/section>\n

<\/p>\n

\n

Material Bed Dynamics \u2014 Why the Vertical Mill Cylinder Sees Different Loads<\/h2>\n
\n \"Material<\/p>\n

On a roller press (#20), the material enters the nip between two rollers from above, in a controlled stream. On a vertical mill, the material is spread across a rotating table by centrifugal force \u2014 creating a material bed that is thicker near the centre (where the feed drops) and thinner near the dam ring at the outer edge (where the ground material overflows). The rollers grind the material as the table sweeps it beneath them.<\/p>\n

This non-uniform bed creates load variations that the vertical mill cylinder must absorb. As the table rotates, each roller encounters alternating thick and thin zones \u2014 the cylinder must compress and extend rhythmically as the material bed thickness varies under the roller. This oscillating load is typically at the table rotation frequency (10\u201330 RPM) \u2014 slower than the roller press vibration but larger in amplitude (10\u201330 mm of roller travel per revolution).<\/p>\n

The nitrogen accumulator absorbs these oscillations \u2014 compressing as the thick zone passes under the roller (roller lifts, cylinder retracts slightly) and expanding as the thin zone passes (roller drops, cylinder extends slightly). Without the accumulator, the pressure spikes on the thick zone would overstress the cylinder and the rocker arm bearings.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n

Three VRM Applications in Cement Production<\/h2>\n
\n
\n Raw material grinding<\/strong><\/p>\n

The dominant VRM application in cement. Grinds limestone, clay, and additives into raw meal for the kiln. The VRM handles drying and grinding simultaneously \u2014 hot kiln exhaust gas passes through the mill, drying the raw material while it is ground. The cylinder must tolerate the thermal cycling from the hot gas (80\u2013350 \u00b0C) passing through the mill body.<\/p>\n<\/p><\/div>\n

\n Coal\/petcoke grinding<\/strong><\/p>\n

VRMs grind the solid fuel used to fire the kiln. Coal and petcoke grinding operate in an inert atmosphere (nitrogen or CO\u2082) to prevent explosion \u2014 the cylinder and its hydraulic connections must be sealed against gas leakage into or out of the mill housing. The cylinder must also tolerate the explosion-proof environment classification of the grinding area.<\/p>\n<\/p><\/div>\n

\n Cement finish grinding<\/strong><\/p>\n

The newest VRM application \u2014 replacing ball mills for final cement grinding. This demands the finest particle size control and the most consistent grinding force. The vertical mill cylinder’s force consistency directly determines the cement fineness \u2014 and therefore the compressive strength of the concrete made from that cement.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Manufacturing<\/h2>\n

\"Korea<\/p>\n

The vertical mill cylinder shares the same bore and rod range as the roller press cylinder \u2014 and the same manufacturing equipment produces both. The critical difference is in the dual-direction force verification: both the extend (grinding push) and retract (roller lift) forces are calculated, verified against the rocker arm geometry, and tested during factory functional testing. The retract force must be sufficient to lift the roller, the rocker arm, and the roller shaft assembly \u2014 which can total 20\u201350 tonnes depending on the mill size. Korea Ever-Power verifies the retract force by calculating the rod-side annular area (bore area minus rod area) \u00d7 pressure, confirming it exceeds the total lift load with a safety margin. Every vertical mill cylinder is hydrostatic tested at 1.5\u00d7 working pressure on both ports and functionally tested for full extend and retract at the specified speeds.<\/p>\n<\/section>\n

<\/p>\n

\n

OEM & ODM<\/h2>\n
\n
\n
\n

What You Provide<\/h3>\n<\/div>\n
\n

VRM model and table diameter, number of rollers, rocker arm geometry (pivot position, cylinder attachment point, roller shaft position), required grinding force per roller, roller assembly weight (for lift force calculation), operating temperature inside the mill housing, atmosphere (air or inert gas), accumulator requirement, and the rocker arm and mill housing drawing.<\/p>\n<\/div><\/div>\n

\n
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What the Factory Delivers<\/h3>\n<\/div>\n
\n

Engineering drawing with bore, rod, stroke, extend force (grinding), retract force (lift \u2014 verified against rocker geometry and roller weight), seal specification (temperature and atmosphere compatible), accumulator mounting provisions, and barrel wall thickness (fatigue-rated for continuous VRM duty). Hydrostatic + dual-direction functional test. Seal kits. Browse all cement equipment cylinders<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

FAQ<\/h2>\n
\n
\n

Can a roller press cylinder be used on a vertical mill, since the specs are identical?<\/h3>\n

The bore, rod, and pressure specs overlap \u2014 but the vertical mill cylinder requires verified retract force for roller lifting, which the roller press cylinder does not need to guarantee. A roller press cylinder might produce sufficient retract force by coincidence, but it has not been engineered or tested for it. Korea Ever-Power engineers each cylinder for its specific application \u2014 the vertical mill cylinder’s rod diameter is selected to provide the required retract force, not just to match a standard ratio.<\/p>\n<\/p><\/div>\n

\n

Why does the mill need to start with rollers lifted?<\/h3>\n

Starting the table rotation with the rollers resting on a bare table (no material bed) causes metal-to-metal contact between the roller and the table liner \u2014 damaging both surfaces and generating extreme vibration. The start-up sequence is: lift rollers \u2192 start table rotation \u2192 begin material feed \u2192 once the material bed is established, lower rollers onto the bed \u2192 begin grinding. The cylinder must hold the rollers in the lifted position during the start-up phase until the operator confirms the material bed is sufficient.<\/p>\n<\/p><\/div>\n

\n

How many vertical mill cylinders per mill?<\/h3>\n

One per grinding roller \u2014 typically 2, 3, or 4 depending on the mill design. Each cylinder operates independently, with its own accumulator, its own proportional valve, and its own grinding force setting. Independent control allows the operator to adjust individual roller forces for uneven material distribution or to compensate for different roller wear rates. Korea Ever-Power supplies matched sets for multi-roller mills. The same independent multi-cylinder control principle applies across the hydraulic cylinder product range<\/a>, including multi-stage forklift mast systems<\/a> and multi-stage telescopic cylinders<\/a>.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Related Categories<\/h2>\n
\n <\/p>\n
\n
\"Telescopic\"<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"Forklift\"<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"AWV\"<\/div>\n
\n
Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Cement equipment vertical mill cylinder \u2014 the hydraulic actuator that presses each grinding roller downward onto the rotating table in a vertical roller mill (VRM). Same specification range as the roller press cylinder (bore 200\u2013700 mm, thrust up to 5,387 KN, 14 MPa) \u2014 but a completely different machine and a different force direction. The roller press pushes two rollers together horizontally. The vertical mill pushes rollers downward onto a table that rotates beneath them. And the vertical mill cylinder must do something the roller press cylinder never does: lift the rollers completely off the table for start-up, maintenance, and emergency stop. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2403,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[852],"product_tag":[],"class_list":["post-2402","product","type-product","status-publish","has-post-thumbnail","product_cat-industrial-engineering-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/product\/2402","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/comments?post=2402"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/media\/2403"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/media?parent=2402"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/product_brand?post=2402"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/product_cat?post=2402"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/hi\/wp-json\/wp\/v2\/product_tag?post=2402"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}