{"id":2424,"date":"2026-06-30T08:59:20","date_gmt":"2026-06-30T08:59:20","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/lower-ring-hydraulic-cylinder-for-vulcanizing-machine\/"},"modified":"2026-06-30T08:59:26","modified_gmt":"2026-06-30T08:59:26","slug":"lower-ring-hydraulic-cylinder-for-vulcanizing-machine","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/zh\/product\/lower-ring-hydraulic-cylinder-for-vulcanizing-machine\/","title":{"rendered":"Lower Ring Hydraulic Cylinder for Vulcanizing Machine"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n
\n
\n Vulcanizing Machine<\/span>
\n Lower Ring Cylinder \u00b7 Centre Mechanism<\/span>\n <\/div>\n

Same Bore. Double the Stroke.
The Hardest Position
on the Press.<\/h2>\n

The upper ring cylinder (#31) operates from above \u2014 lowering the upper chuck onto the tire’s upper bead. The lower ring cylinder operates from below \u2014 rising upward through the centre mechanism column to grip the lower bead. Same bore. Same force. But the lower position needs double the stroke (2,000 mm vs 1,000 mm), fits in a tighter space, and sits closer to the steam-heated mold \u2014 the hottest position on the press frame.<\/p>\n

\n
\n
\u22642,000mm<\/span><\/div>\n
Stroke (2\u00d7 Upper)<\/div>\n<\/div>\n
\n
50\u2013140mm<\/span><\/div>\n
Bore<\/div>\n<\/div>\n
\n
384 KN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
\n
Compact<\/div>\n
Dual-End Cushion<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Why the Lower Ring Cylinder Needs Double the Stroke<\/h2>\n

The upper ring cylinder<\/a> (#31) travels \u22641,000 mm \u2014 enough to move the upper chuck from its raised rest position down to the tire’s upper bead and back. The lower ring cylinder must travel \u22642,000 mm because the lower chuck starts further away from its working position and must clear additional structure during retraction.<\/p>\n

The lower chuck rises from below the mold container, passing upward through the centre of the lower mold, past the bladder well (the recess where the deflated bladder folds during tire loading), and up to the lower bead seat level. The upward travel distance from the rest position to the bead seat is 500\u20131,000 mm \u2014 similar to the upper ring’s stroke. But the lower chuck must also retract far enough below the mold container for the bladder to be changed or inspected from below \u2014 adding another 500\u20131,000 mm of downward travel that the upper ring never needs. The total: up to 2,000 mm.<\/p>\n

\"Lower
\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>\nLower Ring Hydraulic Cylinder for Vulcanizing Machine<\/td>\n<\/tr>\n
Function<\/td>\nDrive the lower bead chuck \u2014 grip lower bead + bladder access<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n50 mm \u2013 140 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n28 mm \u2013 100 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 2,000 mm (2\u00d7 upper ring)<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n384 KN (bore 140 mm \/ pressure 25 MPa)<\/td>\n<\/tr>\n
Key Feature<\/td>\nCompact front and rear cushioning<\/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

Compact Cushioning \u2014 A Long Cylinder That Must Fit in a Short Space<\/h2>\n
\n \"Compact<\/p>\n

The lower ring cylinder has \u22642,000 mm of stroke \u2014 but it must fit inside the centre mechanism column, which is a narrow vertical tube built into the press base. The column’s diameter is fixed by the mold geometry (it passes through the centre of the tire), and its height below the mold container is limited by the press foundation depth.<\/p>\n

Standard end-of-stroke cushions add 50\u2013100 mm to the overall cylinder length at each end \u2014 100\u2013200 mm total. On a 2,000 mm stroke cylinder, this extra length may not fit within the available column height. The lower ring cylinder uses compact cushion designs \u2014 shorter cushion noses, integrated deceleration passages within the end cap rather than external cushion sleeves \u2014 to reduce the overall cylinder length while maintaining the same deceleration performance.<\/p>\n

Both the extend (chuck rising to bead) and retract (chuck dropping for bladder access) ends of the stroke are cushioned. The extend cushion decelerates the chuck before it contacts the bead ring \u2014 preventing impact damage to the bead wire positioning surface. The retract cushion decelerates the chuck before it reaches the column’s lower limit \u2014 preventing impact on the press base structure. Korea Ever-Power designs the compact cushion geometry for each customer’s specific column dimensions.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n
\n

The Lower Position \u2014 Three Challenges the Upper Ring Never Faces<\/h2>\n
\n
\n Closest to the heat source<\/strong><\/p>\n

The steam or hot water that heats the mold enters through the lower platen and the centre mechanism’s lower structure. The lower ring cylinder sits directly adjacent to these steam passages \u2014 experiencing ambient temperatures 20\u201340 \u00b0C higher than the upper ring cylinder. FKM seals are mandatory, and Korea Ever-Power specifies a thermal barrier sleeve between the cylinder body and the centre mechanism column on high-temperature presses.<\/p>\n<\/p><\/div>\n

\n Maintenance access from below<\/strong><\/p>\n

The upper ring cylinder can be accessed from above the press \u2014 visible, reachable, and removable by crane. The lower ring cylinder is buried inside the centre mechanism column, accessible only from below the press base. Seal replacement requires either withdrawing the cylinder downward through a service hatch in the press foundation, or \u2014 on some press designs \u2014 removing the entire centre mechanism assembly. Korea Ever-Power designs the lower ring cylinder with a removable gland that allows seal replacement without extracting the entire cylinder from the column.<\/p>\n<\/p><\/div>\n

\n Condensate and rubber debris accumulation<\/strong><\/p>\n

The lower position collects condensate (from steam leaks and cooling), rubber crumbs (from bladder wear and bead seal scuffing), and lubricant residue \u2014 all of which drain downward by gravity into the lower column where the cylinder lives. This contamination must not reach the cylinder’s rod seal. Korea Ever-Power specifies heavy-duty wiper seals and a drain passage below the rod gland to channel debris away from the seal. Contact the hydraulic cylinder engineering team<\/a> for lower ring cylinder specifications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Upper Ring vs Lower Ring \u2014 Same Job, Different Engineering<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Feature<\/th>\nUpper Ring (#31)<\/th>\nLower Ring (#32)<\/th>\n<\/tr>\n<\/thead>\n
Stroke<\/td>\n\u22641,000 mm<\/td>\n\u22642,000 mm<\/td>\n<\/tr>\n
Operating direction<\/td>\nDown to grip \u2193<\/td>\nUp to grip \u2191<\/td>\n<\/tr>\n
Position on press<\/td>\nAbove mold \u2014 accessible<\/td>\nInside column \u2014 confined<\/td>\n<\/tr>\n
Temperature exposure<\/td>\nModerate (60\u2013100 \u00b0C)<\/td>\nHigher (80\u2013140 \u00b0C)<\/td>\n<\/tr>\n
Contamination risk<\/td>\nLow<\/td>\nHigh (condensate + debris)<\/td>\n<\/tr>\n
Cushion design<\/td>\nStandard<\/td>\nCompact (space-constrained)<\/td>\n<\/tr>\n
Maintenance access<\/td>\nCrane from above<\/td>\nService hatch from below<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Both cylinders are manufactured as a matched pair with identical bore and rod diameters \u2014 ensuring both bead chucks produce the same gripping force and maintain matched concentricity.<\/p>\n<\/section>\n

<\/p>\n

\n \"Lower
\n<\/section>\n

<\/p>\n

\n

Bladder Access \u2014 The Extra 1,000 mm the Upper Ring Does Not Need<\/h2>\n
\n \"Lower<\/p>\n

The rubber bladder \u2014 the inflatable bag inside the tire that presses the rubber against the mold \u2014 is a consumable. It wears, ages, and eventually tears. Bladder life is typically 300\u20131,000 cure cycles. When the bladder is replaced, the lower chuck must retract far enough for the maintenance technician to remove the old bladder from the centre mechanism and install a new one.<\/p>\n

The bladder folds into a well below the lower chuck during tire loading. To access this well for bladder replacement, the lower chuck must retract well below its normal operating range \u2014 dropping past the bladder well to expose the bladder mounting hardware. This additional retraction distance is the primary reason the lower ring cylinder has 2,000 mm of stroke instead of the upper ring’s 1,000 mm.<\/p>\n

Bladder changes happen every 3\u20137 days on a high-volume passenger tire press. The time to retract the lower chuck, change the bladder, and re-extend the chuck is dead production time \u2014 typically 15\u201330 minutes. A fast, reliable lower ring cylinder with smooth retraction and accurate re-positioning minimises this changeover loss.<\/p>\n<\/p><\/div>\n

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

<\/p>\n

\n

Manufacturing \u2014 Compact, Hot, Contaminated<\/h2>\n

\"Korea<\/p>\n

The lower ring cylinder combines three engineering challenges: compact packaging (2,000 mm stroke in a column-constrained space), elevated temperature (80\u2013140 \u00b0C from steam proximity), and contamination exposure (condensate, rubber debris, lubricant draining into the column from above). Korea Ever-Power addresses all three: compact integrated cushions reduce overall length by 80\u2013120 mm compared to standard cushion designs; FKM seals with thermal barrier sleeves handle the temperature; heavy-duty wipers with a drain passage below the gland handle the contamination. The bore is honed to Ra 0.2\u20130.4 \u00b5m over the full 2,000 mm stroke length. Rod concentricity to the bore axis is verified to \u22640.1 mm TIR \u2014 matching the upper ring cylinder for paired bead concentricity. Chrome plating is 50\u201380 \u00b5m. Every lower ring cylinder is hydrostatic tested at 1.5\u00d7 working pressure and position-hold tested alongside its matched upper ring cylinder.<\/p>\n<\/section>\n

<\/p>\n

\n

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

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

Centre mechanism column inner diameter (the cylinder must fit inside), available column height below the mold container, lower chuck travel range (bead seat position to bladder access position), steam passage temperature, bladder well depth, maintenance access type (service hatch or full extraction), and the centre mechanism assembly drawing. Always ordered with the upper ring cylinder (#31) as a matched pair.<\/p>\n<\/div><\/div>\n

\n
\n

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

Engineering drawing with bore, rod (concentricity-matched to upper ring), stroke, compact cushion detail (overall length verified against column height), FKM seal + thermal barrier specification, wiper + drain passage detail, removable gland for in-situ seal replacement, and mounting dimensions. Hydrostatic + position-hold test. Seal kits. Browse the complete vulcanizing machine cylinder family<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

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

Can the lower ring cylinder be replaced without removing the centre mechanism?<\/h3>\n

On most press designs \u2014 yes, if the press foundation has a service hatch below the centre mechanism column. The cylinder is withdrawn downward through the hatch. Korea Ever-Power designs the lower ring cylinder with a barrel outer diameter slightly smaller than the column inner diameter to allow extraction without disassembling the centre mechanism. On presses without a service hatch, the entire centre mechanism must be lifted out \u2014 a major maintenance event.<\/p>\n<\/p><\/div>\n

\n

How often does the bladder change require full lower ring retraction?<\/h3>\n

Every 300\u20131,000 cure cycles \u2014 which on a high-volume passenger tire press running 48\u2013144 cycles\/day means every 2\u201321 days. Heavy truck tire bladders may last longer (lower thermal cycling per cycle), but the lower ring cylinder’s full-retraction function is used at least weekly on most production presses.<\/p>\n<\/p><\/div>\n

\n

Does the lower ring define the tire’s datum surface?<\/h3>\n

Yes \u2014 on most press designs, the lower bead seat is the reference surface from which all tire dimensions are measured during post-cure inspection. The lower ring cylinder’s positioning accuracy directly affects the measurement baseline. If the lower chuck height varies between cycles, the tire inspection system reports false dimensional variation \u2014 leading to unnecessary rejects or, worse, passing out-of-spec tires. Consistent lower ring positioning is verified during Korea Ever-Power’s factory position-hold test. Browse the full hydraulic cylinder product range<\/a> including forklift cylinders<\/a> and 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":"

Lower ring hydraulic cylinder for vulcanizing machine \u2014 the actuator that drives the lower bead chuck of the centre mechanism, operating from below the mold container in the most space-constrained and hottest position on the press. Stroke \u22642,000 mm \u2014 double the upper ring cylinder (#31) \u2014 because the lower chuck must travel further to clear the bladder assembly and the centre post’s lower structure. Same bore range (50\u2013140 mm), same force (384 KN at 25 MPa), but compact front and rear cushioning designed for a cylinder body that must fit inside the narrow centre mechanism column. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2425,"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-2424","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\/zh\/wp-json\/wp\/v2\/product\/2424","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/comments?post=2424"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/media\/2425"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/media?parent=2424"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/product_brand?post=2424"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/product_cat?post=2424"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/zh\/wp-json\/wp\/v2\/product_tag?post=2424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}