JP2013220603A - Tire-curing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tighten a mold evenly and accurately over long periods.SOLUTION: A tire-curing press includes: a lower table on which a lower mold section is mounted; an upper table on which an upper mold section is mounted; a hoisting/lowering means supporting the upper table to move up and down freely; and a mold-tightening means tightening the mold at the lowered position. The hoisting/lowering means includes a crank mechanism. The mold-tightening means includes: a connecting implement having tie rods that interconnect the upper and lower tables; and a pressurizing implement having a ring-shaped pressurizing plate which is disposed to slide vertically inside a ring-shaped groove recessed on the lower table and which has the lower mold section installed on an upper face thereof.

Description

  The present invention relates to a tire vulcanizer that can perform clamping of upper and lower mold parts uniformly and accurately over a long period of time and can stably ensure a large clamping force.

  Patent Document 1 below proposes a tire vulcanizer using a crank mechanism. As shown in FIG. 8, this tire vulcanizer supports a lower table b1 to which a lower mold part a1 is attached, an upper table b2 to which an upper mold part a2 is attached, and the upper table b2 to be movable up and down. Elevating means c. The lift means c is coupled to a crank gear e1 pivotally supported by both side frames d, a vertical side groove e2 provided in the side frames d, and the upper tapebull b2. A crank mechanism e including a slider e3 that slides up and down in the side groove e2 and a link e4 that connects the crank gear e1 and the slider e3 is employed.

  The power from the motor m is transmitted to the crank gear e1 through gear connection, and the mold is opened and closed by moving the upper table b2 up and down together with the upper mold part a2 via the link e4 and the slider e3. For mold clamping, the upper and lower mold parts a1 and a2 are pressed further downward by the toggle action of the crank mechanism e after the upper and lower mold parts a1 and a2 are in contact with each other, and the upper and lower mold parts a1 and a2 are tightened. ing.

  However, when the mold is tightened using the crank mechanism e, an excessive load is applied to the crank gear e1, the link e4, the slider e3, etc., so that wear occurs early in the bearing portion of the pivotal support portion. It is difficult to maintain uniform and high-precision tightening over a long period of time, such as sticking. Further, since the gear teeth and bearings are insufficient in strength, it is difficult to generate a large tightening force.

  In Patent Document 2 below, there is also proposed a tire vulcanizer having a structure in which a long cylinder is used to lift and hold the upper table so that it can be raised and lowered. This will increase the size of the device.

Japanese Patent Laid-Open No. 10-67017 JP 2011-140193 A

  Therefore, the present invention is based on the fact that the mold is opened and closed using a crank mechanism, and the mold is tightened by a connecting tool using a tie rod and a pressurizing tool using a high-pressure fluid. Tire vulcanization that suppresses premature wear of the bearing part of the crank mechanism, prevents looseness, maintains uniform and high-precision tightening over a long period of time, and stably secures a large tightening force The purpose is to provide a machine.

In order to solve the above problems, the invention of claim 1 of the present application is directed to a lower table to which a lower mold part is attached, an upper table to which an upper mold part is attached, and to support the upper table so as to be movable up and down and to a lowered position. Elevating means for closing the upper and lower mold parts, and mold clamping means for fastening the upper and lower mold parts at the lowered position,
Moreover, the lifting means is
A crank that is rotatable around an axis, a guide guide having an upper and lower guide portion extending in the vertical direction, a slider that is attached to the upper table and guided by the guide guide, and the crank and the axis are different. A crank mechanism having a link pivotally supported at a second pivot point provided at a first pivot point provided at a position and having a lower end pivotally supported at a second pivot point provided on the slider;
The mold clamping means is:
A vertical tie rod having one end fixed to one of the lower table or the upper table, and a tie rod clamp that is attached to the other table and clamps the other end of the tie rod in the lowered position. A connector for connecting the upper table and the lower table at the lowered position;
An annular groove that is recessed on the upper surface of the lower table and concentric with the lower mold part, and an annular groove that is slidable up and down in the annular groove and has the lower mold part attached to the upper surface And a pressurizing tool for tightening the upper and lower mold parts by lifting the lower mold part by inflow of a high-pressure fluid into the annular groove. Yes.

  According to a second aspect of the present invention, the crank includes a crank gear having a tooth portion formed on an outer periphery thereof, and the crank gear is rotated by driving means including a driving gear meshing with the tooth portion. .

  According to a third aspect of the present invention, the guide guide is characterized in that a lateral guide portion extending in a horizontal direction is provided continuously at an upper end of the upper and lower guide portions.

  As described above, the tire vulcanizer of the present invention separately includes lifting and lowering means for opening and closing the mold and mold clamping means for tightening the mold, and a crank mechanism is used for the lifting and lowering means. Therefore, for example, the size of the apparatus can be reduced as compared with the case where the upper table is held up and down by using a long cylinder. In addition, the crank mechanism only opens and closes the mold, and the mold is not tightened, so a large load load on the crank mechanism can be suppressed, and wear of the bearing portion can be suppressed to prevent early occurrence of play. Can do.

  The mold clamping means includes a connecting tool for connecting the upper table and the lower table with tie rods, an annular groove recessed on the lower table and concentric with the mold, and slidable up and down in the annular groove. And a pressure tool having an annular pressure plate that lifts the lower mold part by inflow of high-pressure fluid into the annular groove. Therefore, it is possible to generate a large tightening force while having excellent durability, and to perform uniform and high-precision tightening.

It is a perspective view which shows one Example of the tire vulcanizer of this invention. It is an expanded view which expands and shows a part. It is a schematic side view which shows the lowering position and raising position of an upper table with a raising / lowering means. It is a schematic front view which shows the descent | fall position and raising position of an upper table with a raising / lowering means. (A) is a two-view drawing showing the state before clamping of the tie rod, and (B) is a two-view drawing showing the state after clamping. (A) is a top view which shows a pressurization tool, (B) is side part sectional drawing which shows a pressurization tool. (A) is sectional drawing which shows notionally the mold open state in a raise position, (B) is sectional drawing which shows notionally the mold closed state in a fall position. It is a perspective view which shows the conventional tire vulcanizer.

  Hereinafter, embodiments of the present invention will be described in detail. 1 and 2, the tire vulcanizer 1 of this embodiment includes a lower table 3L to which a lower mold part 2L is attached, an upper table 3U to which an upper mold part 2U is attached, and the upper table 3U can be moved up and down. And lowering means 4 for closing the upper and lower mold parts 2U, 2L at the lowered position P1 (shown in FIGS. 3 and 4), and the upper and lower mold parts 2U, 2L at the lowered position P1. And a mold clamping means 5 for clamping.

  The upper and lower mold parts 2U and 2L are not particularly defined, and those having a well-known structure can be suitably used. For example, as shown in FIGS. 7A and 7B, the lower mold part 2L of this example includes a lower side mold 6 corresponding to the lower sidewall part and the lower bead part of the tire T, and the A heating platen plate 7 that supports the lower side mold 6 is included, and the platen plate 7 is attached to the lower table 3L via a pressure plate 41.

  The upper mold portion 2U includes an upper side mold 10 corresponding to the upper sidewall portion and the upper bead portion of the tire T, a tread mold 11 capable of expanding and contracting corresponding to the tread portion of the tire T, and the side mold. 10 and a tread mold 11 and a heating platen plate 12 and a cylindrical container 13 for expanding and reducing the diameter of the tread mold 11. In this example, the container 13 is attached to the upper table 3U so as to be movable integrally, and the platen plate 12 is movable relative to the upper table 3U in the vertical direction with respect to the upper table 3U via, for example, a cylinder 14 or the like. It is attached. In the upper mold part 2U, the platen plate 12 relatively moves up and down due to the expansion and contraction of the cylinder 14, and the tread mold 11 can expand and contract with this relative movement.

  Reference numeral 15 in FIG. 7 is a bladder center mechanism that heats and expands the tire T from the inside during vulcanization. In this example, a so-called BOM type that has a bladder 15b attached to a center post 15a that can be raised and lowered. Illustrated. Reference numeral 16 denotes a push shaft that can be moved up and down to depress the center post 15a and remove the bladder 15b from the vulcanized tire.

  Next, as shown in FIGS. 1 and 2, the tire vulcanizer 1 of the present example has, for example, a U-shaped frame 17 in which side plates 17 </ b> A are raised on both sides. Further, the lower table 3L is attached. In this example, a case where the support base 18 is fixed to the frame 17 is shown. However, the support base 18 is configured as a traveling base that is movable in the front-rear direction, and the lower table 3L is vulcanized with an input position where the raw tire is input into the lower mold part 2L and the input raw tire. You may move between a vulcanization position and the taking-out position which takes out the vulcanized tire. In this case, the efficiency of the tire vulcanization process can be improved.

  Next, the elevating means 4 that supports the upper table 3U so as to be movable up and down includes a crank mechanism 19. Specifically, the crank mechanism 19 includes a crank 20 that can rotate around an axis i, a guide guide 21 having a vertical guide portion 21a extending in the vertical direction, and is attached to the upper table 3U and guided to the guide guide 21. And a link 23 for connecting the crank 20 and the slider 22 to each other.

  The crank 20 of this example includes a pair of crank gears 24 having teeth on the outer periphery, and the crank gears 24 are pivotally connected to the side plate 17A. The drive means 25 for driving each crank gear 24 includes a pair of drive gears 25A meshing with each crank gear 24. In this example, the drive gear 25A is held by a single support shaft 25B driven by a motor. Is done. As a result, the crank gears 24 can be accurately synchronized.

  The guide guides 21 are formed on the side plates 17A. The guide guide 21 includes an upper and lower guide portion 21a extending in the vertical direction, and in this example, an example in which a horizontal guide portion 21b extending in the horizontal direction is connected to the upper end of the upper and lower guide portion 21a is exemplified. The upper and lower guide portions 21a are upper end opening grooves extending along a vertical line passing through the axis i, and guide the slider 22 while being sandwiched between the groove side edges E1 and E1. Further, in the present example, the lateral guide portion 21b is formed by the upper end edge E2 of the side plate 17A smoothly connected to one groove side edge E1 via an arc portion.

  In this example, the slider 22 includes a support shaft portion 22a and a roller portion 22b that is rotatably supported by the support shaft portion 22a and slides or rolls along the groove side edge E1 and the upper end edge E2. Formed from. And the one end part of the said spindle part 22a is fixed to the said upper table 3U side.

  The link 23 has a lower end pivotally supported at a first pivot point Q1 provided on the crank 20 and at a position different from the axis i, and an upper end provided on the slider 22. It is pivoted at the landing Q2. In the present example, the second pivot point Q2 is located at the axial center of the support shaft portion 22a.

  By configuring the lifting / lowering means 4 in this manner, the rotational movement around the axis i of the crank 20 can be converted into vertical movement, and the upper and lower mold parts 2L and 2U are in contact with each other as shown in FIG. The upper mold part 2U can be moved along the guide guide 21 from the lowered position P1 that closes the mold 2 to the spaced position P2 where the upper mold part 2U is separated from the lower mold part 2L and the tire can be attached and detached. . In the case of this example, the vertical movement by the vertical guide part 21a from the lowered position P1 and the lateral movement by the horizontal guide part 21b to the subsequent separation position P2 are performed. By providing the lateral guide portion 21b in this manner, the upper mold portion 2U can be safely stopped while suppressing a drop from the separation position P2.

  Next, as shown in FIG. 4, the mold clamping means 5 is connected between the upper table 3U and the lower table 3L at the lowered position P1, and between the upper table 3U and the lower table 3L. A pressurizing tool 31 for fastening the mold parts 2U and 2L is provided.

  As shown in FIG. 2, the connecting tool 30 has one end (the lower end in this example) fixed to one of the lower table 3L or the upper table 3U (the lower table 3L in this example) and rises vertically. A plurality of tie rods 32 and a tie rod clamp 33 that is attached to the other table (upper table 3U in this example) and clamps the other end 32E (upper end 32E in this example) of each tie rod 32 at the lowered position P1. And formed from.

  The tie rods 32 are arranged at regular intervals around the mold. In this example, a case where four tie rods 32 are arranged around each mold 2 is shown. The tie rod 32 is a long cylindrical body. As shown in FIGS. 5A and 5B, an insertion hole 34 through which the upper end portion 32E of the tie rod 32 passes is formed in the upper table 3U. The The upper end portion 32E has a protruding portion 32E1 that extends upward beyond the upper surface of the upper table 3U, and a circumferential groove-like constricted portion 35 is formed in a stepped shape in the protruding portion 32E1.

  The tie rod clamp 33 includes a pair of halved block-shaped clamp pieces 36 each provided with a semicircular cutout 36A on the opposing surface 36S. The clamp piece 36 is supported by a known holding tool (not shown) using, for example, a cylinder or the like so that the facing surface 36S faces each other and can move forward and backward on the upper table 3U. Then, at the forward movement position T1 where the facing surface 36S comes into contact or close, the notch 36A cooperates to form a locking hole 37 that fills the constricted portion 35, and the upper end 32E can be locked. Further, the upper end portion 32E can be opened at the retracted position T2 that is separated. As the tie rod clamp 33, various known structures can be adopted.

  Further, as shown in FIGS. 6A and 6B, the pressurizing tool 31 includes an annular groove 40 that is recessed on the upper surface of the lower table 3L and is concentric with the lower mold part 2L, and the annular tool 40. An annular pressure plate 41 is provided in the groove 40 so as to be slidable up and down. In this example, the annular groove 40 includes a main groove portion 40a that holds the pressure plate 41 slidably up and down, and a narrow sub groove portion 40b adjacent to the lower side of the main groove portion 40a. A high-pressure fluid supply channel 43 is connected. The pressure plate 41 has the lower mold part 2L attached to the upper surface thereof. Therefore, in the pressurizing tool 31, the pressurizing plate 41 can lift the lower mold part 2L by the inflow of the high-pressure fluid into the annular groove 40, whereby the upper table 3U and the lower table 3L The upper and lower mold parts 2U and 2L can be tightened between them.

  Since the pressurizing tool 31 uses a high-pressure fluid, it can generate a large clamping force while having excellent durability. In particular, since it has an annular shape, a large tightening force can be applied uniformly, and high-precision tightening can be performed. Further, since the structure is simple and compact, it can greatly contribute to the reduction of the apparatus cost and the downsizing of the apparatus.

DESCRIPTION OF SYMBOLS 1 Tire vulcanizer 2L Lower mold part 2U Upper mold part 3L Lower table 3U Upper table 4 Lifting means 5 Mold clamping means 19 Crank mechanism 20 Crank 21 Guide guide 21a Vertical guide part 21b Horizontal guide part 22 Slider 23 Link 24 Crank gear 25 Drive means 25A Drive gear 30 Connecting tool 31 Pressing tool 32 Tie rod 33 Tie rod clamp 40 Annular groove 41 Pressing plate i Axis center P1 Lowering position Q1 First pivot point Q2 Second pivot point

Claims (3)

A lower table to which the lower mold part is attached; an upper table to which the upper mold part is attached; an elevating means for supporting the upper table so as to be movable up and down and closing the upper and lower mold parts at a lowered position; Mold clamping means for clamping the upper and lower mold parts at a position,
Moreover, the lifting means is
A crank that is rotatable around an axis, a guide guide having an upper and lower guide portion extending in the vertical direction, a slider that is attached to the upper table and guided by the guide guide, and the crank and the axis are different. A crank mechanism having a link pivotally supported at a second pivot point provided at a first pivot point provided at a position and having a lower end pivotally supported at a second pivot point provided on the slider;
The mold clamping means is:
A vertical tie rod having one end fixed to one of the lower table or the upper table, and a tie rod clamp that is attached to the other table and clamps the other end of the tie rod in the lowered position. A connector for connecting the upper table and the lower table at the lowered position;
An annular groove that is recessed on the upper surface of the lower table and concentric with the lower mold part, and an annular groove that is slidable up and down in the annular groove and has the lower mold part attached to the upper surface And a pressurizing tool for tightening the upper and lower mold parts by lifting the lower mold part by the inflow of high-pressure fluid into the annular groove. Tire vulcanizer.   2. The tire according to claim 1, wherein the crank is composed of a crank gear having a tooth portion formed on an outer periphery thereof, and the crank gear is rotated by driving means including a driving gear meshing with the tooth portion. Vulcanizer.   The tire vulcanizer according to claim 1 or 2, wherein the guide guide includes a horizontal guide portion extending in a horizontal direction at an upper end of the upper and lower guide portions.

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