WO2003041933A1

WO2003041933A1 - Tire vulcanizer

Info

Publication number: WO2003041933A1
Application number: PCT/JP2001/009889
Authority: WO
Inventors: Takuzou Sano; Akikazu Seko
Original assignee: The Yokohama Rubber Co.,Ltd.
Priority date: 2001-11-13
Filing date: 2001-11-13
Publication date: 2003-05-22

Abstract

In a prior art tire vulcanizer employing a sectional die, a supporting member becomes large because a side die is arranged on an upper plate and the uniformity of a tire is poor. Since a segment (13) for holding a sector is arranged on the lower plate side, a member being supported by the upper plate can be reduced in weight and size and power consumption can also be reduced. Since the holding segment (13) is provided on the lower plate side, clearance between the holding segment (13) and a guide member (15) can be made small as compared with prior art when it is advanced or retracted while engaging with the guide member (15) and the uniformity of a tire can be improved.

Description

Satsuki Itoda β Tire Vulcanizer

Technical field

The present invention relates to a tire vulcanizer used for vulcanization molding of a pneumatic tire, and more particularly, to a tire vulcanizer using a sectional mold.

Background technology

Generally, a tire vulcanizer using a sectional mold is provided with an annular lower die 61 fixed on a lower plate 60 and above a lower plate 60, as shown in FIG. The upper mold 62 includes a ring-shaped upper mold 62 and a side mold composed of a plurality of sectors 63 provided on the outer peripheral side of the upper mold 62.

The upper mold 62 is attached to an upper mold support plate 66 arranged below the upper plate 64 so as to be able to move up and down by a cylinder 65. In each sector 63, a holding segment 67 is fixed to the outer peripheral side, and the holding segment 67 is vertically inclined to each guide segment 68 suspended from the outer peripheral edge of the upper plate 64. It is freely mounted on

A plurality of guide rails 70 extending in the radial direction of the lower die 61 are installed on the auxiliary plate 69 on the lower plate 60, and the segments 67 are retained on the guide rails 70. ing.

A vertically movable center mechanism 72 equipped with a bladder 71 is installed on the inner peripheral side of the lower die 61. The upper plate 64 can be moved up and down by a rod 73 a of a lifting means 73. In the figure, 74 is an upper bead ring and 75 is a lower bead ring.

In the tire vulcanizer described above, when the conveyed green tire W is held by the inflated bladder 71, the upper mold 62 is opened and closed by the cylinder 65. Descent to the starting position. Next, the rod 73 a of the elevating means 73 extends to lower the upper plate 64, and the upper mold 62 is set on the side part Wa located on the upper side in the green tire W diagram, while the lower mold is set. 6 Set 1 on the side part Wa located below the green tire W.

On the other hand, the retaining segments 67 descending with the lowering of the upper plate 64 engage the radially extending guide rails 70 and then advance towards the center along the guide rails 70 and the sector 1 6 3 The green tire W into the tread section Wb. When the green tire W is set in the mold in this way, a heated and pressurized fluid is supplied into the bladder 71 as indicated by an arrow Q, and the green tire W is vulcanized.

The conventional vulcanizer described above is generally large, and since the upper plate 64 supports members such as a heavy side die and an upper die, the upper plate 64 (the upper plate 6 4 also supports these members, so a thicker one is required, which results in a heavier one.) Elevating means 7 3 also needs a large one, so many things are needed to operate it. Consumes power. Therefore, there has been a strong demand for improvement.

In addition, since the holding segment 67 is engaged with and disengaged from the guide rail 70, the holding segment 67 and the guide rail 70 are required to be securely engaged with the guide rail Ί0. In the meantime, some clearance is required. The clearance causes the sector 163 to move due to the pressure from the inner circumference applied to the set section during vulcanization, which lowers the uniformity of the vulcanized tire. Had become.

Disclosure of the invention

An object of the present invention is to provide a tire vulcanizer that can be reduced in size and power consumption. Another object of the present invention is to provide an evening vulcanizer capable of improving the uniformity of a vulcanized tire.

A tire vulcanizer according to the present invention that achieves the above object has an annular lower mold fixed on a lower plate, and an elevating plate that moves up and down together with the upper plate below an upper plate that can be raised and lowered above the lower plate. A tire having a sectional mold having an annular upper mold disposed in the upper mold and a side mold in which a plurality of sectors divided along the circumferential direction on the outer peripheral side of the lower mold are openably and closably disposed. In the vulcanizer, a holding segment for holding the section is provided on the outer peripheral side of each sector, and the holding segment is arranged on the lower plate so as to be able to advance and retreat toward the center of the annular lower mold, A detachable guide segment is hung on the outer peripheral side of the holding segment on the outer peripheral side of the upper die of the upper plate, and the guide segment is engaged with the retaining segment to hold the upper end. Was allowed to advance and retreat segment, and wherein the Rukoto to open and close the section evening one.

Since the holding segment for holding one sector is provided on the lower plate side in this manner, the weight of the member supported by the upper plate can be significantly reduced as compared with the related art. Therefore, the upper plate that supports them can be made thinner than before, making it smaller and lighter. Also, related members for supporting the upper plate so as to be able to move up and down can be made small and lightweight. In addition, the means for raising and lowering the upper plate becomes smaller. Accordingly, the size of the tire vulcanizer can be reduced, and the power consumed by the means for raising and lowering the upper plate is reduced, so that power consumption can be reduced.

In addition, the guide segment attached to the upper plate and the holding segment arranged on the lower plate side are engaged and disengaged.The holding segment is arranged to be able to move forward and backward on the lower plate side. When using guide members, the clearance between them is smaller than before. It becomes possible to cut. Therefore, during vulcanization, the sector 1 is more difficult to move than before because of the pressure applied from the inner circumference to the set sector 1. Therefore, it is possible to improve a decrease in the uniformity of the tire caused by the clearance.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view showing an example of the tire vulcanizer of the present invention when viewed from the direction of the arrow I-I in FIG. 3 and before the mold clamping.

FIG. 2 is a cross-sectional view showing a state in which the mold is clamped in FIG.

FIG. 3 is a plan view of the clamped state shown in FIG. 2, with parts on the upper plate side removed.

FIG. 4 is an enlarged cross-sectional view showing the guide segment and the holding segment of FIG. 1 in a cross section taken along line III-III in FIG.

FIG. 5A is a cross-sectional view of the guide segment of FIG. 4 taken along the line IV-IV. Fig. 5 (b) is a cross-sectional view of the holding segment in Fig. 4 taken along arrows IV and -IV. FIG. 6 is a sectional view showing another example of the holding segment and corresponding to FIG.

FIG. 7 is a sectional view of a main part showing an example of a conventional tire vulcanizer.

BEST MODE FOR CARRYING OUT THE INVENTION

In the figure, in the tire vulcanizer of the present invention, a base plate 3 extending in a 7_Κ flat direction is placed on a support member 1 erected on a base surface B. The base plate 3 is formed in a square shape as shown in FIG. 3, and has a circular opening 3a at the center as shown in FIG.

A circular lower plate 5 is fixed on the base plate 3. The center region 5a of the lower plate 5 is thicker than the outer peripheral side portion 5b, and a circular opening 5c is formed at the center of the center region 5a. On the center area 5a, one side W1 of the green tire W is molded. An annular lower die 7 is provided to perform the operation. An annular bead ring 9 for molding one bead portion W2 of the green tire W is fixed to the inner peripheral side of the lower die 7.

As shown in FIG. 3, an annular side die 11 for molding a tread portion W2 of the green tire W is provided on the outer peripheral side of the lower die 7. The side mold 11 is composed of a plurality of sectors 11a divided along the circumferential direction. On the outer peripheral side of each sector 11a, a holding segment 13 for holding the sector 11a is arranged. Each sector 11a is detachably fixed to a corresponding holding segment 13 by a bolt (not shown). A plurality of guide members 15 are provided on the outer peripheral side 5b of the lower plate 5 for moving the sector 11a between its open position and its closed position (the mold clamping set position). . As shown in FIG. 3, the guide member 15 extends straight toward the center. Each holding segment 13 is engaged with each pair of parallel guide members 15, and each holding segment 13 can move forward and backward on the guide member 15 toward the center of the lower mold 7. By moving the holding segment 13 on the guide member 15, the sector 11a can be opened and closed between the open position and the closed position. As shown in FIGS. 4 and 5, the outer peripheral surface 13 a of each holding segment 13 is provided with a concave portion 13 b extending vertically. A groove 13X is formed on both bottom walls of the recess 13b along the direction in which the recess 13b extends, and a flat bottom surface 13c including one wall surface of the groove 13X is It is formed on an inclined surface that is inclined so that the lower the lower the lower the outer circumferential side. On the bottom surface 13c, a plate member 13 for reducing frictional resistance with a guide segment described later is provided so as to be flush with the bottom surface 13c.

On the periphery of the lower plate 5 located on the outer peripheral side of the holding segment 13, there is provided a ring-shaped stopper member 1 with which a mold clamping holding block described later can be engaged. 4 are located. At a plurality of positions on the lower plate 5 between the holding segments 13, cylindrical positioning portions 12 into which positioning pins to be described later are fitted are protruded at predetermined intervals in a circumferential direction.

A central mechanism 17 provided with a vulcanizing bladder 16 is provided on the inner peripheral side of the lower mold 7. The center mechanism 17 has a first cylinder 21 attached to the center of the support frame 19 (center of the lower die 7) suspended around the opening 3a of the base plate 3. A telescopic opening 21 a extending vertically of the first cylinder 21 is a lifting post that moves up and down by operation of the first cylinder 21.

The first cylinder 2 1

2 3 are installed. A disc-shaped lower fixing member 25 for fixing a lower end of a cylindrical vulcanizing bladder 16 is mounted on an upper end of a telescopic pad 23 a extending above the second cylinder 23. Is placed. The operation of the second cylinder 23 raises and lowers the bladder lower fixing member 25. The first cylinder 21 and the second cylinder 23 extend to a hole 咅 5 26 formed in the base surface B. A supply pipe 27 for supplying a pressurized heating medium into the vulcanizing bladder 16 is connected to the lower bladder fixing member 25. .

The elevating post penetrates the bladder lower fixing member 25 and extends to above. The upper end of the vulcanizing bladder 16 is gripped by a bladder upper fixing member 29 fixed to the upper end of the elevating post, and the vulcanizing bladder 16 It is provided at the top.

Above the lower plate 5, an upper plate 31 extending 7K flat is provided. The upper plate 31 slidably engages with a plurality of columns 35 erected between the base plate 3 and a horizontally extending top plate 33 disposed above the upper plate 31. And it can move up and down along the column 35. Below the center of the upper plate 31, a disk-shaped upper die support plate 37 is provided. An annular upper mold 39 for molding the other side portion W4 of the green tire W is fixed to the lower surface of the upper mold support plate 37. An upper bead ring 41 for molding the other bead portion W5 of the green tire W is fixed to the inner peripheral side of the upper die 39. The upper die supporting plate 37 can be moved up and down by a lifting cylinder 43 mounted on the upper plate 31.

A plurality of guide segments 47 are suspended at predetermined intervals along the circumferential direction on the lower surface of the upper plate 3 1 on the outer peripheral side from the upper die supporting plate 37 via ring-shaped segment fixing members 45. Has been established. Each of the guide segments 47 has a projection 47 a on each side thereof which engages with the groove 13 X formed in the recess 13 b of the holding segment 13 as shown in FIGS. ing. The inner peripheral surface 47 b of the guide segment 47 is formed as a flat inclined surface having the same inclination angle as the bottom surface 13 c of the concave portion 13 b of the holding segment 13. The protrusion 47a extends along the inner peripheral surface 47b. One side of the projection 47a is formed flush with the inner peripheral surface 47b, and the other side is provided with a plate member 47c for reducing frictional resistance with the holding segment 13 which is in sliding contact. .

When the guide segment 47 descends due to the lowering of the upper plate 31, the guide segment 47 engages with the recess 13 b of the holding segment 13 while engaging the projection 47 a with the groove 13 X. Combine. As it further descends, it is pushed by the guide segment 47 and the holding segment 13 moves on the guide member 15 toward the inner peripheral side, whereby the sector 11a moves from the open position to the closed position. Moving. In the closed position of the sector 11a, when the guide segment 47 rises due to the rise of the upper plate 31, the holding segment 13 is pulled by the guide segment 47 and moves toward the outer peripheral side. 1 1a moves toward the open position. At the open position of sector 1 1 1a (the position in FIG. 1), the guide segment 47 rises apart from the holding segment 6. Thus, the guide segment 47 is detachable from the holding segment 13.

A mold clamping holding block 48 is detachably fixed to the outer peripheral side of the guide segment 47 by a bolt (not shown). The outer peripheral surface 48 a of the mold clamping holding block 48 is sized to be able to contact the inner peripheral surface 14 a of the stopper member 14. When the sector 1 1 a moves to the closed position, the outer peripheral surface 48 a of the mold clamping block 48 abuts the inner peripheral surface 14 a of the stopper member 14, and the bladder 16 that is added during vulcanization The internal pressure prevents the holding segment 13 from retreating.

The top plate 33 is provided with lifting means 49 for raising and lowering the upper plate 31. The elevating means 49 applies a mold clamping force to the mold during vulcanization, and includes a hydraulic cylinder 51 disposed on the upper center of the top plate 33. The lower end of a telescopic port 51 a extending up and down of the hydraulic cylinder 51 is fixed to the upper surface of the central part of the upper plate 31. By the operation of the hydraulic cylinder 51, the upper plate 31 moves up and down while being guided by the columns 35.

The top plate 33 is provided with a plurality of locking means 53 for locking the upper mold 39 lowered to the vulcanizing position. Each locking means 53 is a topf. It has a locking cylinder 53 A arranged on the upper surface of the rate 33. When the upper plate 31 is lowered to the vulcanizing position, as shown in FIG. The extended rod 53B is engaged, and the upper plate 31 is locked by locking the slide rod 54, whereby the upper mold 39 in the vulcanization position is opened by the internal pressure applied during vulcanization. I do not do it.

On the ring-shaped segment fixing member 45, positioning pins 55 that can be fitted to the positioning portions 12 are protruded downward at positions corresponding to the positioning portions 12.

Hereinafter, the operation of the tire vulcanizer described above will be described. First, when the green tire W is transported to the outer peripheral side of the bladder 16 by transport means (not shown), a pressurized fluid is supplied to the bladder 16 via the supply pipe 27, and the bladder 16 is inflated. Hold green tire W from inside. After holding the green gear, the first cylinder 21 of the center mechanism 17 operates to retract the telescopic opening (elevating bob) 21a from the position in Fig. 1 to the vulcanizing position (the position in Fig. 1). (The lifting post descends to the vulcanization position.)

Next, the elevating cylinder 43 is actuated, the upper die support plate 37 is lowered, and the upper die 39 and the upper bead ring 41 are moved to the setting start position shown in FIG. Subsequently, the telescopic rod 51 of the hydraulic cylinder 51 extends, and the upper plate 31 descends.

The upper die 39 and the upper beading 41 descending with the lowering of the upper plate 31 abut on the other side 咅 PW 4 of the green tire W and the bead portion W5 and are positioned. At the same time, the operation of the lifting cylinder 43 is released, and the rod 43a of the lifting cylinder 43 can be contracted. On the other hand, the guide segment 47 descends while engaging the projection 47 a with the groove 13 X of the holding segment 13. The inner peripheral surface 4 7 b of the guide segment 47 is the concave of the retaining segment 咅 Pressing the bottom surface 13 c of the IH 3 b from the outer peripheral side 1 Advance 1a toward the closed position. Also, the descending positioning pins 55 are engaged with the cylindrical positioning portions 12 protruding from the lower plate 5, and the upper plate 31 is positioned with respect to the lower plate 5. When the upper plate 31 is lowered to the lowermost position, the rod 53B of the locking cylinder 53A is extended to engage with the upper end of the slide rod 54 to lock the upper plate 31. As a result, the lower die 7, the upper die 39, and the sector 11a are set on the green tire W, respectively, and the state shown in FIG. At this time, the mold clamping retaining block 48 arranged on the outer peripheral side of the guide segment 47 comes into contact with the inner peripheral side of the stopper member 14, and the internal pressure of the bladder 16 applied at the time of vulcanization causes the retaining segment 13. To prevent retreat.

When the mold clamping is completed, the pressurized and heated fluid is supplied into the bladder 16 via the supply pipe 27, and the green tire W is vulcanized.

According to the present invention described above, since the sector 1 1 a and the holding segment 13 are not attached to the upper mold plate 31 but are arranged on the lower plate 5 side, the member supported by the upper plate 31 Is significantly lighter than before. Therefore, the upper plate 31 for supporting them can be made thinner than in the past, and the size and weight can be reduced. Further, the column 35 for supporting the upper plate 31 slidably can be made thinner, and the top plate 33 for supporting the upper plate 31 via the hydraulic cylinder 51 can be made thinner than before. In addition, the capacity of the hydraulic cylinder 51 can be changed to a significantly smaller capacity than before. Accordingly, the size of the tire vulcanizer can be reduced, and the hydraulic cylinder 51 for raising and lowering the upper plate 31 can be reduced in size, so that the power consumed by the lifting and lowering means 49 can be reduced.

In addition, since the holding segment 13 is always engaged with the guide member 15 and is not configured to be disengaged as in the related art, the clearance between the holding segment 13 and the guide member 15 is made larger than before. Can be smaller. Therefore, during vulcanization, the sector 11a becomes more difficult to move due to the pressure from the inner circumference applied to the set sector 11a than in the past. Improve the formality.

In the present invention, the inclination angle α of the bottom surface (engaging surface) 13 c of the concave portion 13 b formed in the outer peripheral surface 13 a of the holding segment 13 with respect to the vertical direction, and the guide segment 4 slidingly contacting the bottom surface 13 c The inner peripheral surface of 7 (engagement surface) 47 The inclination angle of b 7] is preferably 15 to 20 °. If the skew angles α and β are outside the above ranges, it is difficult for the vertically descending guide segment 47 to smoothly engage with the holding segment 13. More preferably, the angle should be approximately 18 °.

Also, the plate 13 provided on the other side of the projection 47 of the guide segment 47, the groove 13 of the holding segment 13 with which the member 47c slides, the inclined wall surface of the X 13 (the wall surface located on the outer peripheral side), and the upper end of 13 As shown in FIG. 4, the part 13 z is formed into a curved surface chamfered by an arc having a radius of 10 to 30 ° in order to smoothly engage the guide segment 47 with the holding segment 13. preferable. Alternatively, as shown in FIG. 6, the upper end 13z may be cut away. That is, as shown by the two-dot chain line, the wall surface 13y is extended upward, and the distance 1 horizontally measured from the position P in contact with the upper surface 13n of the holding segment 13 to the outer peripheral side is 10 to 30. The upper end 13z is cut out in the range of the thigh, and the upper end of the cut upper end 13z is chamfered into a curved surface with an arc of a radius of 10 to 30 thighs. Even in this case, the holding segment 13 and the guide segment 47 can be smoothly engaged.

The stopper member 14 described above is formed in a ring shape to facilitate attachment to the lower plate 5, but instead, each stopper member having a block shape is provided on the outer peripheral side of each holding segment 13 respectively. It may be arranged. As described above, in the evening vulcanizer according to the present invention, since the holding segments for holding the sectors are arranged on the lower plate side, the weight of the members supported by the upper plate can be significantly reduced as compared with the related art. So it The upper plate that supports them can be made much thinner than before, making it smaller and lighter. Also, related members for supporting the upper plate so as to be able to move up and down can be made small and lightweight. Furthermore, the means for raising and lowering the upper plate becomes smaller and lighter. Therefore, the size of the tire vulcanizer can be reduced, and the power consumed by the means for raising and lowering the upper plate can be reduced.

In addition, since the holding segment is disposed on the lower plate so as to be able to move forward and backward, and this holding segment is engaged with and disengaged from the guide segment provided on the upper plate side, when the holding segment is engaged with the guide member and moved forward and backward. The clearance between the holding segment and the guide member can be made smaller than before. Therefore, it is possible to improve the tire uniformity due to the clearance.

Industrial applicability

The present invention having the above-described excellent effects can be extremely effectively used as a tire vulcanizer when manufacturing pneumatic tires for passenger cars, trucks, buses, and the like.

Claims

The scope of the claims

1. An annular lower mold fixed on the lower plate, and an annular upper mold arranged to ascend and descend together with the upper plate below an upper plate that can be moved up and down above the lower plate. In the evening vulcanizing machine having a sectional mold having a side mold in which a plurality of sectors divided along the circumferential direction on the outer peripheral side of the lower mold are openably and closably mounted, each sector includes: A holding segment for holding the sector is provided on one outer peripheral side, and the holding segment is disposed on the lower plate so as to be able to advance and retreat toward the center of the annular lower die, and on the outer peripheral side of the upper die of the upper plate. A detachable guide segment is suspended from the outer periphery of the holding segment, and the guide segment engages with the holding segment to move the holding segment forward and backward, thereby opening the sector. Tire vulcanizer to close.

2. The engaging surface between the holding segment and the guide segment is formed on an inclined surface inclined at substantially the same angle with respect to the vertical direction, and the angle of the inclined surface with respect to the vertical direction is set to 15 to 20 °. The evening vulcanizer according to claim 1.

3. On the outer peripheral surface of the holding segment, a concave portion is formed which extends vertically and is inclined so that the bottom surface is closer to the outer peripheral side as the lower side is formed, and on both side surfaces at the bottom of the concave portion along the inclination direction of the concave portion. A groove extending so that the inner peripheral surface of the guide segment is formed so as to be inclined toward the outer periphery toward the lower side, and a projection portion engageable with the groove is formed on both side surfaces, The tire vulcanizer according to claim 2, wherein the engagement surface is a bottom surface of a concave portion of the holding segment and an inner peripheral surface of the guide segment.

4. The evening vulcanizer according to claim 3, wherein an upper end portion of a wall surface located on an outer peripheral side of the groove is chamfered with a curved surface having a radius of 10 to 30 thighs.

5. The upper end of the wall located on the outer peripheral side of the groove is formed on a vertical plane extending in the vertical direction, and the upper end is chamfered with a curved surface of a radius of 10 to 30 thighs. A twill vulcanizer according to claim 3.

6. A clamp holding block is fixed to an outer peripheral side of the guide segment, and a stopper member with which the clamp retaining block can be engaged is arranged on an outer peripheral side of the holding segment on the lower plate, and the guide segment is provided. Is engaged with the holding segment, and when the sector 1 is moved to the closed position by advancing the holding segment, the mold clamping holding block contacts the inner peripheral side of the stopper member, The tire vulcanizer according to any one of claims 1 to 5, which prevents the holding segment from retracting.

7. The evening vulcanizer according to claim 1, wherein a guide member is provided on the lower plate so that the holding segment can move forward and backward.

8. The tire calo-sulfurizer according to claim 1, further comprising a center mechanism provided with a vulcanizing bladder on an upper part of a vertically movable elevating post on the inner peripheral side of the lower die.

9. The tire vulcanizer according to claim 1, wherein the upper die is provided on the upper plate so as to be able to move up and down.