JPH07156150A - Center mechanism of tire vulcanizing machine - Google Patents

Abstract

PURPOSE:To accurately and easily perform perforation processing or incorpora tion for a pin and enhance press processing accuracy due to a segment. CONSTITUTION:When a diameter is expanded, a second flange member 30 is allowed to be spaced apart from a first flange member 29 and the movement thereof is transmitted to a first press member 35 through a first link to move the first press member 35 to the inside in a radius direction and the movement of the first press member 35 is transmitted to a second press member 36 through a second link to move the second press member 36 to the inside in the radius direction. When the outer peripheral surface of the second press member 36 reaches the inside from the inner diameter of a tire bead part, the first press member 35 is moved inwardly as compared with the second press member 36 and the contraction of a diameter is completed. At the time of the expansion of the diameter, respective parts are moved reversely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a central mechanism of a vulcanization type tire vulcanizer which does not use a bladder.

[0002]

2. Description of the Related Art In a tire vulcanizer, a heating / pressurizing medium is introduced into a tire through a bladder, and a heating / pressurizing medium is directly introduced into a tire without using a bladder. In a system that does not use a bladder, it is necessary to dispose a pressing member (segment) for shaping the inner surface of the bead portion including the bead toe portion of the tire so as to face the bead ring.

Since a bundle of bead wires is incorporated in the bead portion of the tire and cannot be expanded or contracted, the pressing member is divided so that each can be expanded / contracted in the radial direction. A tire vulcanizer that is smaller than the above and has an annular shape that is larger than the inside diameter of the tire kibide portion when the diameter is expanded has already been proposed. For example, in the one disclosed in Japanese Patent Laid-Open No. 212105/1982, the shape of the cam groove of the cam plate gives a difference in the amount of movement of adjacent segments to enable expansion / contraction.

In Japanese Patent Application Laid-Open No. 2-59306, a slider that is slidable in the axial direction and each segment are connected by a link, and the length of the link is two types, long and short. It gives a difference in the amount of movement to enable scaling.

[0005]

In the above-mentioned conventional tire vulcanizer, a gap for sliding the segments is required between each of the segments which are slidable in the radial direction and the sliding guide portion. When pressing and molding the bead part of the tire at the final position, the reaction force of the pressing part causes each segment to move in the gap part, and the size of the segment sliding part tends to be misaligned during long-term operation. The accuracy decreases.

Further, in the one disclosed in Japanese Patent Laid-Open No. 2-59306, the links for sliding the segments are concentrated in a small area of the system, which causes problems in processing and assembly. In addition, since a structure having sufficient strength cannot be formed from a space, backlash is liable to occur, and in this case also, there is a problem that the press molding accuracy is lowered. The present invention is proposed in view of the above problems, and the purpose thereof is to:
It is an object of the present invention to provide a central mechanism of a tire vulcanizer that can accurately and easily perform hole processing and assembly for the pin (see 31) and that can improve the pressing processing accuracy by the segment.

[0007]

In order to achieve the above object, the present invention forms an inner surface of a bead portion of a tire into a circular ring which is divided in the circumferential direction and faces a bead ring mold when the diameter is expanded. A plurality of first pressing members and second pressing members, a first flange member that alternately and radially movably supports the first pressing member and the second pressing member, and the first flange member. A second flange member concentrically and vertically movable immediately above the first flange, a first link connecting the second flange member and each of the first pressing members, and an adjacent first and second pressing member. And a second link to perform.

In the central mechanism of the tire vulcanizer, when the second flange member approaches the first flange member and the first and second pressing members are expanded in diameter to form an annular shape,
The second pressing member may be sandwiched by the first and second flange members.

[0009]

The central mechanism of the tire vulcanizer of the present invention is constructed as described above, and when the diameter is expanded, the second flange member is separated from the first flange member, and its movement is mediated by the first link. To each first pressing member to move each first pressing member inward in the radial direction, and to transmit the movement of each first pressing member to the second pressing member via the second link,
The respective second pressing members are moved inward in the radial direction. When the outer peripheral surface of each second pressing member reaches the inside of the inner diameter of the tire bead portion, each first pressing member moves inward of each second pressing member, and the diameter reduction is completed. To do. When expanding the diameter, the above parts move in the opposite direction,
The diameter is expanded.

[0010]

EXAMPLE Next, the central mechanism of the tire vulcanizer of the present invention is shown in FIG.
6 will be described. 1 is a main frame of a tire vulcanizer, 3 is a lower hot plate fixed to the main frame 1 via a heat insulating plate 2, and 4 is a bolted bolt to the lower hot plate 3. Lower mold,
Reference numeral 8 denotes a movable frame that can approach and separate from the main frame 1 by a guide means and a drive means (neither shown), 6 an upper heating plate fixed to the movable frame 8 via a heat insulating plate 7, and 5 an upper heating plate. 6 is an upper die bolted to 6, 6 is an upper bead ring elevating device assembled to the movable frame 8, 10 is an upper outer cylinder bolted to the upper bead ring elevating device 9, and is mounted on the lower end of the upper outer cylinder 10. A bead ring 10a (see FIG. 2) is formed.

Reference numeral 11 is a lower bead ring bolted to the lower mold 4, and 12 is a lower outer cylinder suspended from the lower heating plate 3. 13 is a first shaft of a quadruple shaft that is vertically inserted into the lower outer cylinder 12, 14 is a flange that is bolted to the lower end of the first shaft 13, and 15 is vertically inserted into the first shaft 13. The second shaft of the heavy shaft, 16 is a flange screwed to the lower end portion of the second shaft 15, 17 is the third shaft of a quadruple shaft that is vertically inserted into the second shaft 15, and 18 is the third shaft 17. Flange screwed to the lower end,
The fourth of the four-fold shaft 19 is inserted into the third shaft 17 so as to be able to move up and down.
Shaft, 20 is a guide rod, 21 is a guide flange, 22
Is a flange, and one end of the guide rod 20 is a flange 1
8 and the other end of the guide rod 20 is a flange 22.
It is screwed to.

1a is a seat of the main frame 1, and 25 is a plurality of cylinders fixed to the seat 1a (only one is shown in the figure). The tip of the piston rod of each cylinder 25 is screwed into the flange 16. Have been combined. Reference numeral 26 denotes a plurality of cylinders fixed to the flange 16 (only one is shown in the drawing). The tip end of each cylinder 26 is screwed into the flange 14, and the operation of each cylinder 25 causes The shaft 13 and the second shaft 15 move simultaneously, and the operation of each cylinder 26 causes the first shaft 13 to move relative to the second shaft 15.

Reference numeral 27 denotes a plurality of cylinders fixed to the flange 18 (only one is shown in the drawing), and the tip end of the piston rod of each cylinder 27 is screwed to the flange 16. 28 is a cylinder fixed to the flange 22, and the tip end portion of the piston rod of the cylinder 28 is screwed into the guide flange 21, and the operation of each cylinder 27 causes the third shaft 17 and the fourth shaft 19 to move simultaneously and at the same time. 2 axes 1
5, the fourth shaft 19 moves relatively to the third shaft 17 by the operation of the cylinder 28.

Between each shaft, and between the first shaft 13 and the lower outer cylinder 12
A guide bush, a seal member, a retaining member for these members, etc. are incorporated between the third shaft 17 and the fourth shaft 19 as needed, and a space serving as a pressurized heating medium passage is formed between the third shaft 17 and the fourth shaft 19. The portion 24 is formed, and at the lower end of the space portion 24,
The pipe 23 is connected. 29 is the inner upper flange (first
The inner upper flange 29 is attached to the upper end of the third shaft 17 by a bayonet lock mechanism. That is, when the claw 29b formed on the inner peripheral portion of the inner upper flange 29 is in the middle of the claw 17a formed on the third shaft 17 side, the inner upper flange 29 can be hung up and down, and the inner upper flange 29 is hung. After that, when the claw 29b is turned to a position where the claw 29b overlaps the claw 17a, the claw 29b is rotated.
7a, and the inner upper flange 29 is moved to the third position by the bayonet lock mechanism in which the third shaft 17 is locked.
It is attached to the upper end of the shaft 17.

Reference numeral 29a denotes a plurality of T grooves formed on the upper surface of the inner upper flange 29 in the radial direction, and blocks 34 and 37 are alternately slidably inserted into the T grooves 29a.
35 and 36 are segments divided in the circumferential direction into a plurality of segments (first segment
The pressing member and the second pressing member), these segments 3
When the diameters of the tires 5 and 36 are expanded, they have a ring shape, and the upper surface faces the upper bead ring 10a to form a curved surface for molding the inner surface of the bead portion of the tire T. Among these segments, 35 is a small segment and 36 is a large segment. The small segment 35 is fixed with a block screw, and the large segment 36 is fixed with a block 37 with a screw.

Reference numeral 30 denotes an outer upper flange (second flange member) mounted on the top of the fourth shaft 19 by a bayonet lock mechanism, and the projection 3 formed on the lower surface of the outer upper flange 30.
0a and the block 34 are the pins 31, 33 and the first link 3
It is connected by 2 and. Further, the block 34 and the adjacent block 37 are connected by the pins 38 and 40 and the second link 39. The outer upper flange 30 sandwiches the blocks 34 and 37 between the inner upper flange 29 and the inner upper flange 29 at the limit of approach to the inner upper flange 29.
Fix by removing the sliding gap of 37.

Reference numeral 41 denotes an inner lower flange assembled to the second shaft 15 by the bayonet lock mechanism, and 42 denotes an outer lower flange assembled to the first shaft 13 by the bayonet lock mechanism. The inner lower flange 41 and the outer lower flange 42 correspond to each other. The shape and size of the assembly part with the shaft to be
Flange 4 except that the top and bottom are reversed
Segments, blocks assembled to 1, 42,
The links are exactly the same.

Next, the operation of the central mechanism of the tire vulcanizer shown in FIGS. 1 to 6 will be specifically described. The operation of the cylinder 28 (or 26) causes the fourth shaft 1 to move against the third shaft 17.
When 9 is relatively moved up (or the first shaft 13 is moved down relative to the second shaft 15), the outer upper flange 30 rises with respect to the inner upper flange 29 (or the inner lower flange 41). (Or the outer lower flange 42 is lowered), the block 34 slides inward in the radial direction via the first link 32, and the block 37 slides inward in the radial direction via the second link 39 as the block 34 slides. However, since the angle between the block 34 and the second link 39 changes from large to small during this time, the moving amount of the block 37 is initially small with respect to the moving amount of the block 34, and gradually moves at a constant speed. The segment 3 that initially formed a ring
5 and 36 (see the upper half of FIG. 4), the pitch circle diameter of the segment 35 becomes smaller than the pitch circle diameter of the segment 36, and the segments 35 and 36 are reduced in diameter (see the lower half of FIG. 4). .

Cylinder 28 (or cylinder 26)
Is operated in the opposite direction to the above, the diameters of the segments 35 and 37, which have been reduced in diameter, are increased to form a ring shape. Further, when the cylinder 25 is operated, the inner upper flange 29 and the inner lower flange 41 and the outer upper flange 30 and the outer lower flange 42 are simultaneously moved up and down, and when the cylinder 27 is operated, the inner upper flange 29 and the outer upper flange 30 are moved. The set of the inner lower flange 41 and the outer lower flange 42 moves up and down with respect to the set.

During tire vulcanization, the above-mentioned upper and lower groups are brought closer to each other in advance to reduce the diameters of the segments 35 and 36, and after the unvulcanized tire T is suspended by a loader (not shown),
Actuating the cylinders 26, 28 to turn the segments 35, 3
6 is expanded. Next, the cylinder 35 is operated to raise the segments 35 and 36 to support the suspended upper bead portion of the unvulcanized tire T from the inside (Fig. 3, Japanese pepper).

Next, the cylinder 27 is operated to lower the lower segment, and the lower bead portion of the unvulcanized tire T is pushed into the lower bead ring 11. Then, the upper mold 5 is lowered to bring the upper bead ring 10a into contact with the upper bead portion of the unvulcanized tire T, and then the unvulcanized tire is passed from the pipe 23 through the space portion (pressurized heating medium passage) 24. While feeding the low-pressure gas into T, the upper die 5 is further lowered, and the shaping process is started.

After the upper mold 5 and the lower mold 4 are closed, the heating medium of high temperature and high pressure is fed into the unvulcanized tire T to start the vulcanization process of the unvulcanized tire T. After the vulcanization of the tire T is completed, first, the heating medium is discharged from inside the tire T through the pipe 23, the cylinder 27 is made free, the cylinder 25 is operated, and the inner lower flange 41 is brought closer to the inner upper flange 29. .

Next, the upper mold 5 is raised to peel off the vulcanized tire T from the lower mold 4. Then the cylinder 26,
27 is operated to reduce the diameter of the segments 35 and 36,
After the upper mold 5 is further raised, the upper outer cylinder 10 is lowered, the vulcanized tire T is peeled off from the upper mold 5, and it can be taken out by an unloader (not shown). Depending on the type of vulcanizer main body, after the heating medium is discharged, the cylinder 2
7, the inner upper flange 29 is lowered, the upper mold 5 is raised, the vulcanized tire T is peeled from the upper mold 5, and the mold is opened, and then the cylinder 25
To raise the vulcanized tire T, grip the vulcanized tire T with an unloader (not shown), and then activate the cylinders 26 and 27 to reduce the diameter of the segment,
Then, the vulcanized tire T may be carried out of the tire vulcanizer.

In the embodiment, the assembling portion to the quadruple shaft is a bayonet lock mechanism, so that it is possible to assemble and adjust the upper and lower parts of the segment and the like in advance outside the machine and then carry them into the machine and mount them. Therefore, there is an advantage that the replacement work can be performed easily and in a short time, and the detailed work at a high temperature (a mold or the like is close to 200 ° C.) can be eliminated to ensure safety.

[0025]

As described above, the central mechanism of the tire vulcanizer according to the present invention includes the first pressing member and the second flange member among the plurality of first and second pressing members which are divided in the circumferential direction. Are connected via the first link (half of the first and second pressing members). Since the concentration of the first link on the side opposite to the first pressing member is half that of the conventional one, Since the links for sliding the members are not concentrated in the central portion, it is possible to easily and accurately perform hole processing and assembly for the pins (see 31) and improve the pressing processing accuracy of the pressing member. .

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a central mechanism of a tire vulcanizer of the present invention.

FIG. 2 is an enlarged vertical sectional side view showing a state of an arrow a portion of FIG.

FIG. 3 is a vertical cross-sectional side view showing another state of the arrow a portion of FIG.

4 is a cross-sectional plan view taken along the line bb of FIG.

5 is a vertical cross-sectional side view taken along the line cc of FIG.

6 is a vertical cross-sectional side view taken along the line dd of FIG.

[Explanation of symbols]

 10a Upper bead ring 11 Lower bead ring 29 First flange member (inner upper flange) 30 Second flange member (outer upper flange) 32 First link 35 First pressing member (first segment) 36 Second pressing member (second) Segment) 39 2nd Link T Tire

Claims (2)

[Claims] 1. A plurality of first pressing members and a plurality of second pressing members, each of which is formed into an annular shape that is divided in the circumferential direction and faces a bead ring mold when the diameter is expanded to form an inner surface of a bead portion of a tire.
A pressing member, a first flange member that alternately and radially movably supports the first pressing member and the second pressing member, and concentrically and vertically movable are provided directly above the first flange member. A second flange member, a first link connecting the second flange member and each of the first pressing members, and a second link connecting adjacent first and second pressing members. The central mechanism of the tire vulcanizer. 2. When the second flange member approaches the first flange member and the first and second pressing members are expanded in diameter to form an annular shape, these first and second pressing members are The central mechanism of the tire vulcanizer according to claim 1, wherein the central mechanism is sandwiched by the first and second flange members.