Metal inner mold guide mechanism for tire vulcanization

Abstract

The present invention relates to a metal inner mold guide mechanism for tire vulcanization, belonging to the field of tire production equipment. The mechanism comprises a wide tile guide mechanism, a narrow tile guide mechanism, a base, and a central mechanism sleeve rod. The narrow tile guide mechanism includes a narrow tile petal-shaped wedge and a flange, the wide tile guide mechanism includes a wide tile petal-shaped wedge and a connecting ring, and the central mechanism sleeve rod comprises a core rod and a hollow rod. The narrow tile petal-shaped wedge includes an upper ring seat and a certain number of narrow tile wedge plates, and the wide tile petal-shaped wedge includes a lower ring seat and a certain number of wide tile wedge plates. Due to the use of a split guide mechanism, the present invention can achieve a larger diameter reduction ratio and can meet the specifications of high-section, small-diameter tires. During vulcanization, the wedge plates are stable and reliable without deformation. The slider at the bottom of the tile bracket cooperates with the base slide rail with a linear gradient in width, which not only meets the strength requirements of the vulcanization process but also ensures that the slider and the slide rail repeatedly cooperate smoothly without obstruction.

Description

Technical Field

[0001] The invention belongs to the field of tire production equipment, in particular to a metal inner mold guiding mechanism for tire vulcanization. Background Art

[0002] As is well known, the current tire vulcanization process uses a rubber inner mold (commonly known as a bladder) in conjunction with a metal outer mold to apply high-intensity hot pressing to the tire blank, thereby producing a finished tire with a patterned surface and excellent performance. However, the current bladder has poor dimensional accuracy after expansion and insufficient rigidity, making it unable to meet the high-precision processing requirements of high-performance tires. Therefore, the industry has developed a metal vulcanization inner mold technology that replaces the bladder structure. Patent ZL201310575159 discloses a metal vulcanization inner mold that uses a rigid mechanical mechanism to achieve radial expansion and contraction of the mold. However, this structure is only suitable for tires with larger rim sizes and lower cross-section heights. To this end, patent CN216127782U discloses a stepped vulcanization inner mold. When the mold contracts, it adopts a two-layer structure, with the narrow tiles first contracting and then rising to a higher position, leaving space for the wider tiles to subsequently contract. Compared to patent ZL201310575159, this structure can meet the requirements of tires with smaller rim sizes and higher cross-sections, making it more widely applicable. However, this structure presented numerous issues, making it difficult to implement and maintain. First, the assembly method of "welding the wide tile wedge to the inner piston rod, while bolting the outer piston rod to the narrow tile wedge" was unfeasible. Second, the inner mold wedge was structurally unstable and prone to deformation during the high-intensity hot-pressing vulcanization process. Furthermore, the tile bracket and the baseplate limit plate were mated via rolling bearings, which were also prone to deformation under repeated high-pressure conditions. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a metal inner mold guide mechanism for tire vulcanization, which can be widely applied to different tire specifications, reduce the number of tiles constituting the inner mold, reduce the complexity of the mechanism, and facilitate maintenance.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a metal inner mold guide mechanism for tire vulcanization, provided with a base, characterized in that a central mechanism sleeve rod is inserted into the center of the base, and the wide tile guide mechanism and the narrow tile guide mechanism are sleeved on the central mechanism sleeve rod; the narrow tile guide mechanism includes a narrow tile petal-shaped wedge block and a flange, the wide tile guide mechanism includes a wide tile petal-shaped wedge block and a connecting ring 120, and the central mechanism sleeve rod is composed of a core rod and a hollow rod; the narrow tile petal-shaped wedge block includes an upper ring seat and a narrow tile wedge plate, the narrow tile wedge plates are evenly distributed around the circumference of the upper ring seat and are fixed to the upper ring seat, and the narrow tile wedge plates are fixed to the upper ring seat. The height is greater than the height of the upper ring seat, the upper end surface of the narrow tile wedge plate is flush with the upper end surface of the upper ring seat, and a slide rail is provided on the outer side of the narrow tile wedge plate; the wide tile petal-shaped wedge block includes a lower ring seat and a wide tile wedge plate, the wide tile wedge plates are evenly distributed around the circumference of the lower ring seat and are fixed to the lower ring seat, the height of the wide tile wedge plate is greater than the height of the lower ring seat, the lower end surface of the wide tile wedge plate is flush with the lower end surface of the lower ring seat, and a slide rail is also provided on the outer side of the wide tile wedge plate; the flange is fixed to the narrow tile petal-shaped wedge block, wherein the flange includes three parts: a flange sleeve, a flange end cover and a head ring, the outer diameter of the flange sleeve is the same as the inner diameter of the upper ring seat, and the inner diameter of the flange sleeve is equal to the core rod diameter, The height of the flange sleeve and the thickness of the connecting ring are equal to the height of the upper ring seat. The outer edge of the flange end cover is inside the side wall of the upper ring seat. The flange head ring is fixed to the core rod through the central mechanism clamping ring. The inner diameter of the lower ring seat is smaller than the inner diameter of the upper ring seat and equal to the outer diameter of the hollow rod. The hollow rod is fixed to the lower ring seat of the wide tile-shaped wedge block through the connecting ring. The outer diameter of the connecting ring is smaller than the inner diameter of the upper ring seat. The narrow tile-shaped wedge block is slidably assembled with the wide tile-shaped wedge block. The number of narrow tile wedge plates is the same as the number of narrow tile wedge plates. The narrow tile wedge plates and the wide tile wedge plates are evenly distributed alternately in the circumferential direction. The inner surfaces of all narrow tile wedge plates are close to the side wall of the lower ring seat. The inner surfaces of all wide tile wedge plates are tightly attached to the side walls of the upper ring seat, the height of the wide tile wedge plates is the same as that of the narrow tile wedge plates, and the sum of the height of the upper ring seat and the lower ring seat is equal to the height of the wedge plates; slide rails are evenly distributed around the base, and the width of the slide rails is linearly gradient, with the width being larger on the side close to the central mechanism sleeve rod and smaller on the other side; the central mechanism sleeve rod is sequentially inserted into the base, the wide tile petal-shaped wedge block and the narrow tile petal-shaped wedge block, and the hollow rod and the lower ring seat of the wide tile petal-shaped wedge block are assembled and fixed using a connecting ring, the flange sleeve is inserted into the narrow tile petal-shaped wedge block, and the core rod is fixedly connected to the flange head ring through the central mechanism clamping ring.

[0005] The present invention can also be achieved by the following measures:

[0006] The matching surfaces of the narrow tile-shaped wedge block and the wide tile-shaped wedge block both have draft angles.

[0007] A positioning groove is provided on the side wall of the lower ring seat of the wide tile-shaped wedge block matched with the inner surface of the narrow tile wedge plate.

[0008] The matching surface between the narrow tile-shaped wedge block and the wide tile-shaped wedge block is a plane or an arc surface.

[0009] A stopper is additionally provided inside the bottom sliding rail of the narrow tile wedge plate.

[0010] The present invention has the beneficial effect of achieving a greater diameter reduction ratio due to the use of a split guide mechanism, meeting the specifications of high-section, small-diameter tires, extending its applicability, and simplifying equipment assembly and disassembly, making it easy to operate. During vulcanization, the inner surfaces of all narrow shoe wedges closely contact the sidewalls of the lower ring seat, while the inner surfaces of all wide shoe wedges closely contact the sidewalls of the upper ring seat. Thus, the upper and lower ring seats provide force support points, ensuring the stability and reliability of the wedges and preventing deformation. Furthermore, the slider at the bottom of the shoe support, mating with a base rail with a linearly tapered width, not only meets the strength requirements of the vulcanization process but also ensures smooth, repeatable engagement between the slider and rail without obstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and examples.

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 This is a perspective view of the metal inner mold guide mechanism for tire vulcanization according to the present invention.

[0014] Figure 3 The figure is a schematic diagram of the narrow tile-shaped wedge block of the metal inner mold guide mechanism for tire vulcanization of the present invention.

[0015] Figure 4 This is a schematic diagram of the wide tile-shaped wedge block of the metal inner mold guide mechanism for tire vulcanization of the present invention.

[0016] Figure 5 This is a schematic diagram of the base of the metal inner mold guide mechanism for tire vulcanization of the present invention.

[0017] In the figure, 100. wide tile guide mechanism, 200. narrow tile guide mechanism, 300. base, 400. center mechanism sleeve rod, 210. narrow tile petal-shaped wedge, 220. flange, 110. wide tile petal-shaped wedge, 120. connecting ring, 410. core rod, 420. hollow rod, 211. upper ring seat, 212. narrow tile wedge plate, 111. lower ring seat, 112. wide tile wedge plate, 221. sleeve, 222. end cover, 223. head ring, 310. base slide rail, 1111. lower ring seat side wall, 1112. positioning groove, 2111. upper ring seat side wall. DETAILED DESCRIPTION

[0018] Figure 1 , Figure 2As shown, the present invention consists of a wide tile guide mechanism 100, a narrow tile guide mechanism 200, a base 300 and a central mechanism sleeve rod 400. The narrow tile guide mechanism 200 includes a narrow tile petal-shaped wedge block 210 and a flange 220. The wide tile guide mechanism 100 includes a wide tile petal-shaped wedge block 110 and a connecting ring 120. The central mechanism sleeve rod 400 consists of a core rod 410 and a hollow rod 420.

[0019] Figure 3 As shown, the narrow tile-shaped wedge block 210 includes an upper ring seat 211 and a certain number of narrow tile wedge plates 212. The narrow tile wedge plates 212 are evenly distributed around the upper ring seat 211 and are welded and fixed to the upper ring seat 211. The height of the narrow tile wedge plates 212 is greater than the height of the upper ring seat 211. The upper end surface of the narrow tile wedge plates 212 is flush with the upper end surface of the upper ring seat 211, and a sliding rail is provided on the outer side of the narrow tile wedge plates 212.

[0020] Figure 4 As shown, the wide tile-shaped wedge block 110 includes a lower ring seat 111 and a certain number of wide tile wedge plates 112. The wide tile wedge plates 112 are evenly distributed around the lower ring seat 111 and are welded and fixed to the lower ring seat 111. The height of the wide tile wedge plates 112 is greater than that of the lower ring seat 111. The lower end surface of the wide tile wedge plates 112 is flush with the lower end surface of the lower ring seat 111, and a sliding rail is also provided on the outer side of the wide tile wedge plates 112.

[0021] The flange 220 is assembled and fixed to the narrow tile-shaped wedge block 210, wherein the flange 220 includes three parts: a flange sleeve 221, a flange end cover 222 and a head ring 223. The outer diameter of the flange sleeve 221 is the same as the inner diameter of the upper ring seat 211, the inner diameter of the flange sleeve 221 is equal to the diameter of the core rod 410, the height of the flange sleeve 221 and the thickness of the connecting ring 120 are equal to the height of the upper ring seat 211, the outer edge of the flange end cover 222 is within the side wall 2111 of the upper ring seat, the flange head ring 223 is fixedly matched with the core rod 410 through the central mechanism clamping ring, the inner diameter of the lower ring seat 111 is smaller than the inner diameter of the upper ring seat 211, and is equal to the outer diameter of the hollow rod 420, the hollow rod 420 is fixedly matched with the lower ring seat 111 of the wide tile-shaped wedge block 110 through the connecting ring 120, and the outer diameter of the connecting ring 120 is smaller than the inner diameter of the upper ring seat 211.

[0022] When the vulcanization inner mold is in an expanded state, the narrow tile petal-shaped wedge block 210 and the wide tile petal-shaped wedge block 110 are slidably assembled, the number of narrow tile wedge plates 212 is the same as the number of narrow tile wedge plates 212, the narrow tile wedge plates 212 and the wide tile wedge plates 112 are alternately and evenly distributed circumferentially, the inner surfaces of all narrow tile wedge plates 212 are in close contact with the side wall 1111 of the lower ring seat, the inner surfaces of all wide tile wedge plates 112 are in close contact with the side wall 2111 of the upper ring seat, the height of the wide tile wedge plates 112 is the same as the height of the narrow tile wedge plates 212, and the sum of the height of the upper ring seat 211 and the height of the lower ring seat 111 is equal to the wedge plate height.

[0023] Figure 5As shown, a certain number of slide rails are evenly distributed around the base 300, and the width of the slide rails is linearly gradient. The width is larger on one side close to the center mechanism sleeve rod 400 and smaller on the other side to ensure that the bottom slider of the narrow tile bracket can smoothly return after leaving the base slide rail 310.

[0024] In the metal inner mold guide mechanism for tire vulcanization of the present invention, the mating surfaces of the narrow tile-shaped wedge 210 and the wide tile-shaped wedge 110 each have a certain draft angle to ensure that the narrow tile-shaped wedge 210 and the wide tile-shaped wedge 110 can be assembled smoothly without obstruction after separation. The lower ring seat sidewall 1111 of the wide tile-shaped wedge 110, which mates with the inner surface of the narrow tile wedge plate 212, is provided with a positioning groove 1112 to ensure that the narrow tile guide mechanism 200 does not swing laterally during the ascent and descent process, resulting in inaccurate positioning. The mating surfaces of the narrow tile-shaped wedge 210 and the wide tile-shaped wedge 110 can be either flat or arcuate. A guide rod is mounted on the narrow tile-shaped wedge 210, extending through the wide tile-shaped wedge 110 and the base 300 to prevent circumferential relative displacement of the base 300, the wide tile-shaped wedge 110, and the narrow tile-shaped wedge 210 during ascent and descent. A stopper is added inside the bottom sliding rail of the narrow tile wedge plate 212 to prevent the narrow tile bracket from separating from the narrow tile wedge plate 212 when it reaches the extreme contraction position.

[0025] The present invention provides a method for installing a metal inner mold guide mechanism for tire vulcanization. In the first step, the central mechanism sleeve rod 400 is sequentially inserted into the base 300, the wide tile-shaped wedge 110, and the narrow tile-shaped wedge 210. In the second step, the hollow rod 420 and the lower ring seat 111 of the wide tile-shaped wedge 110 are assembled and fixed using the connecting ring 120. In the third step, the flange 220 is inserted into the narrow tile-shaped wedge 210, and the core rod 410 is fixedly connected to the flange head ring 223 via the central mechanism clamping ring.

[0026] The operating principle of the metal inner mold guide mechanism for tire vulcanization of the present invention is as follows: When the inner mold contracts, the core rod 410 drives the narrow shoe guide mechanism 200 upward, causing the mating surfaces of the narrow shoe petal-shaped wedge 210 and the wide shoe petal-shaped wedge 110 to slide against each other, causing the narrow shoe bracket to contract. When the narrow shoe is fully contracted, the bottom slider of the narrow shoe bracket disengages from the slide rail of the base 300. Simultaneously, the internal stopper of the bottom slide rail of the narrow shoe wedge plate 212 abuts against the narrow shoe bracket slideway. The core rod 410 drives the narrow shoe guide mechanism 200 to continue to rise, and the narrow shoe bracket rises along with the narrow shoe guide mechanism 200. The narrow shoe petal-shaped wedge 210 and the wide shoe petal-shaped wedge 110 disengage. When the narrow shoe is completely positioned above the wide shoe, it stops moving. At this time, the hollow rod 420 drives the wide shoe guide mechanism 100 to begin to rise, and the wide shoe bracket contracts until it is in place. When the inner mold expands, the hollow rod 420 drives the wide shoe guide mechanism 100 downward, causing the wide shoe bracket to expand until it is in place. Afterwards, the core rod 410 drives the narrow tile guide mechanism 200 to descend, and the matching surfaces of the narrow tile petal-shaped wedge block 210 and the wide tile petal-shaped wedge block 110 come into contact again. When the bottom slider of the narrow tile bracket is flush with the base slide rail 310, the core rod 410 continues to descend, and the bottom slider of the narrow tile bracket returns to the slide rail of the base 300. At this time, the narrow tile bracket gradually expands until it is in place.

Claims

1. A metal inner mold guide mechanism for tire vulcanization, provided with a base, characterized in that: A center mechanism sleeve rod is inserted in the center part of the base, and the wide tile guide mechanism and the narrow tile guide mechanism are sleeved on the center mechanism sleeve rod; the narrow tile guide mechanism includes a narrow tile petal wedge and a flange, the wide tile guide mechanism includes a wide tile petal wedge and a connecting ring, and the center mechanism sleeve rod is composed of a core rod and a hollow rod; the narrow tile petal wedge includes an upper ring seat and a narrow tile wedge plate, the narrow tile wedge plates are evenly distributed around the circumference of the upper ring seat and are fixed to the upper ring seat, the height of the narrow tile wedge plate is greater than the height of the upper ring seat, the upper end surface of the narrow tile wedge plate is flush with the upper end surface of the upper ring seat, and a slide rail is provided on the outer side of the narrow tile wedge plate; the wide tile petal wedge includes a lower ring seat and a wide The wide tile wedge plates are evenly distributed around the circumference of the lower ring seat and are fixed to the lower ring seat. The height of the wide tile wedge plates is greater than the height of the lower ring seat. The lower end surface of the wide tile wedge plates is flush with the lower end surface of the lower ring seat. A sliding rail is also provided on the outside of the wide tile wedge plates. The flange is fixed to the narrow tile petal-shaped wedge block, wherein the flange consists of three parts: a flange sleeve, a flange end cover and a head ring. The outer diameter of the flange sleeve is the same as the inner diameter of the upper ring seat, the inner diameter of the flange sleeve is equal to the core rod diameter, the height of the flange sleeve and the thickness of the connecting ring are equal to the height of the upper ring seat, the outer edge of the flange end cover is inside the side wall of the upper ring seat, and the flange head ring is fixed to the core rod through the central mechanism clamp ring The inner diameter of the lower ring seat is smaller than that of the upper ring seat and is equal to the outer diameter of the hollow rod. The hollow rod is fixedly matched with the lower ring seat of the wide tile-petal wedge block through a connecting ring. The outer diameter of the connecting ring is smaller than the inner diameter of the upper ring seat. The narrow tile-petal wedge block and the wide tile-petal wedge block are slidably assembled. The number of narrow tile wedge plates is the same as the number of narrow tile wedge plates. The narrow tile wedge plates and the wide tile wedge plates are evenly distributed alternately in the circumferential direction. The inner surfaces of all narrow tile wedge plates are in close contact with the side wall of the lower ring seat, and the inner surfaces of all wide tile wedge plates are in close contact with the side wall of the upper ring seat. The height of the wide tile wedge plates is the same as the height of the narrow tile wedge plates. The matching surface of the narrow tile-petal wedge block and the wide tile-petal wedge block is a plane. , or it is an arc surface, the sum of the upper ring seat height and the lower ring seat height is equal to the wedge plate height; slide rails are evenly distributed on the circumference of the base, and the width of the slide rails is linearly gradient, the width is larger on the side close to the center mechanism sleeve rod, and the width is smaller on the other side; the center mechanism sleeve rod is inserted into the base, the wide tile-shaped wedge block and the narrow tile-shaped wedge block in turn, and the hollow rod and the lower ring seat of the wide tile-shaped wedge block are assembled and fixed using the connecting ring, and the flange sleeve is inserted into the narrow tile-shaped wedge block. The core rod is fixedly connected to the flange head ring through the center mechanism clamping ring, and the mating surfaces of the narrow tile-shaped wedge block and the wide tile-shaped wedge block both have draft angles.

2. The metal inner mold guide mechanism for tire vulcanization according to claim 1, characterized in that A positioning groove is provided on the side wall of the lower ring seat of the wide tile-shaped wedge block matched with the inner surface of the narrow tile wedge plate.

3. The metal inner mold guide mechanism for tire vulcanization according to claim 1, characterized in that A stopper is additionally provided inside the bottom sliding rail of the narrow tile wedge plate.

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