JPH10291216A - Tire vulcanizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire vulcanizing device equipped with a centering mechanism wherein even though compression force following vertical movement of an inner cylinder is applied, a tire is not solidified by a method wherein a space for passing a rubber broken piece or the like between inner and outer cylinders is secured so that the rubber broken piece or the like is not compressed by accumulation. SOLUTION: In a central mechanism of a tire vulcanizer operating a bladder 9 inserted inside a tire 8 during vulcanization, and a part of a tire mold, a groove extending in a vertical axial core direction is intermittently formed peripherally on either of a slide cylinder surface between an outer cylinder 20 wherein a central mechanism is hung on an inner peripheral part of a platen 3, and an inner peripheral part of a platen 3, and an inner cylinder 21 wherein it is, in a freely slidably vertically moving manner, incorporated in the outer cylinder 20, and a lower bead ring 5 is fitted to an upper end part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center mechanism of a tire vulcanizer for manufacturing a pneumatic tire mounted on an automobile or the like.

[0002]

2. Description of the Related Art The center mechanism of a tire vulcanizer is well-known (for example, Japanese Patent Application Laid-Open No. 03-274113), and will not be described in detail. The sliding surface of the outer cylinder suspended from the outer cylinder and the inner cylinder that is slidably ascended and descendable in the outer cylinder and has a lower bead ring attached to the upper end is the inner peripheral surface of the outer cylinder and the inner cylinder. Each of the outer peripheral surfaces is formed over the entire circumference, and the two sliding surfaces are engaged to enable the sliding movement of the inner cylinder.

[0003]

However, in the above-mentioned central mechanism of the conventional tire vulcanizer, the scattered release agent generated when the vulcanized tire is taken out, or invades the mating surface of the mold or the air vent hole. Pieces of solidified rubber, etc., enter between the outer cylinder and the inner cylinder, hinder smooth sliding up and down of the inner cylinder, and in some cases, even damage or even deform the sliding surface. I was If such a problem occurs, the entire tire vulcanizer device must be stopped for inspection and maintenance of the central mechanism, and the effect on productivity has been great.

According to the present invention, the cause of such a problem is that rubber fragments and the like deposited on the upper end of the outer cylinder of the central mechanism are solidified by the application of a compressive force caused by the elevation of the inner cylinder to the temperature rise caused by the vulcanization of the tire. In order to avoid the accumulation and compression of rubber fragments, this problem was solved by securing a space between the inner and outer cylinders for passing rubber fragments, etc. An object of the present invention is to provide a tire vulcanizer having a center mechanism.

[0005]

Means for Solving the Problems To solve the above-mentioned problems of the prior art, the center mechanism of the present invention comprises: (1) a plurality of members extending vertically in the outer peripheral surface of the inner cylinder or the inner peripheral surface of the outer cylinder. Are provided along the circumferential direction at intervals, and a sliding surface is formed on the remaining convex portion. (2) Alternatively, a bush is intermittently fixed to at least one of the upper end portion of the inner peripheral surface of the outer cylinder and the lower end portion of the outer peripheral surface of the inner cylinder in the circumferential direction by screwing or other means to form a sliding surface on the bush. The configuration is as follows. (3) Alternatively, at least one of the upper end portion of the inner peripheral surface of the outer cylinder and the lower end portion of the outer peripheral surface of the inner cylinder, the metal is intermittently spray-coated in the circumferential direction, and a sliding surface is formed on the spray-coated metal. It has a configuration.

According to the present invention, there is provided an inner peripheral surface of a lower mold which is capable of dropping rubber fragments and the like through a gap secured between the inner and outer cylinders secured by the above-mentioned structure, and which is formed on the way down the inner cylinder. The air in the room surrounded by the lower bead ring, the outer peripheral surface of the inner cylinder, and the upper end surface of the outer cylinder is discharged through the gap by the further lowering of the lower bead ring. In addition, the rubber fragments are prevented from being deposited on the upper end surface of the outer cylinder so that the rubber fragments are compressed and solidified.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on the illustrated embodiments.

(First Embodiment) FIGS. 1 and 2 show a first embodiment of a center mechanism of a tire vulcanizer according to the present invention. Here, FIG. 1 is a sectional view showing a main part of a platen type vulcanizer incorporating a central mechanism embodying the present invention, and FIG. 2 is a partial sectional view taken along line AA of FIG.

The tire vulcanizer has a base 1,
A platen (lower heating plate) 3 is fixed to the upper surface of the base 1 via a heat insulating plate 2. On the upper surface of the platen 3, a lower mold 4 corresponding to a lower mold portion of a tire mold is bolted, and an inner peripheral portion of the lower mold 4 has a lower mold which constitutes a part of the tire mold. The bead ring 5 is engaged and attached. An upper mold 6 corresponding to the upper mold portion of the tire mold is fitted on the upper surface of the lower mold 4, and an upper bead ring 7 is bolted to an inner peripheral portion of the upper mold 6. The upper die 6 can be moved up and down by a device not shown.

A vulcanized tire 8 is housed in a tire mold, and a bladder 9 is inserted inside the vulcanized tire 8. The upper end of this bladder 9 is clamped and fixed between a flange 10a of an upper clamp ring 10 and a bladder presser 13 bolted to the same flange 10a. Through the center post 12. A lower ring 16 is disposed below the upper clamp ring 10 so as to face the lower clamp ring 10.
6, a clamp ring 17 is bolted. The lower end of the bladder 9 is clamped and fixed between the lower ring 16 and the clamp ring 17, and the center post 12 is slidably moved up and down in the center of the lower ring 16. . Further, a known seal member 14 is inserted between the lower ring 16 and the center post 12, and the guide bush 15 is bolted from above. Further, a spacer 18 is provided on the lower surface of the lower ring 16.
The center post cylinder 19 is fixed via the center post cylinder 19, and the tip of the piston rod of the center post cylinder 19 is connected to the center post 12, and the upper and lower ends of the bladder 9 are separated via the center post 12 by the action of the cylinder 19. Or approaching.

An outer cylinder 20 of a central mechanism for operating the lower bead ring 5 and the bladder 9 is suspended on an inner peripheral portion of the platen 3, and an inner cylinder 21 is slidably moved up and down inside the outer cylinder 20. Have been. A lower bead ring 5 is screwed and fixed to the upper end of the inner cylinder 21, and a plurality of grooves 21a extending in the vertical axis direction are formed on the outer periphery thereof as shown in FIG.
Are formed intermittently in the circumferential direction. A sliding surface 21b is formed on the outer peripheral surface of the convex portion located between the grooves 21a to engage with the inner peripheral cylindrical surface of the outer cylinder 20. A beam 26 is fixed to the lower surface of the inner cylinder 21 via a spacer (not shown).
A pair of bead lift cylinders 24 is connected to the inner cylinder 21 via pins 23 and 25, and the inner cylinder 21 is configured to slide up and down by the action of these bead lift cylinders 24.

The lower ring 16 is inserted slidably up and down with the inner peripheral surface of the inner cylinder 21 as a guide, and a bladder retracting cylinder 22 is fixed to the lower surface of the inner cylinder 21.
The distal end of the piston rod 22a of the bladder retracting cylinder 22 is connected to the lower ring 16, and is configured to retract the bladder 9 into the inner cylinder 21 via the lower ring 16 by the action of the cylinder 22. ing. The lower ring 16 is provided with a pair of conduits 16a and 16b communicating with the inside of the tire mold.
The heating / pressurizing medium is pressed into the bladder 9 through the holes a and 16b, and after vulcanization, the heating / pressurizing medium is heated through the holes in the conduits 16a and 16b.
The pressurized medium is discharged, and at this time, the tire 8 is heated and pressurized via the bladder 9 to perform a vulcanization action.

Next, the operation of the center mechanism of the tire vulcanizer will be described. When the vulcanization of the tire 8 is completed, first, the heating / pressurizing medium filled in the bladder 9 is passed through the conduits 16a, 16a.
6b, the upper and lower ends of the bladder 9 are brought closer to each other by the action of the center post cylinder 19, and then the lower ring 16 is lowered by the action of the bladder retracting cylinder 22 to remove the bladder 9 from the tire 8. Is drawn into the inner cylinder 21 to be housed.

Next, the upper mold 6 of the tire mold is raised, and the upper half of the tire 8 is separated from the upper mold 6.
The lower bead ring 5 is raised by the operation of the bead drift cylinder 24 to peel the tire 8 from the lower mold 4. Thereafter, the vulcanized tire 8 is taken out by a known procedure, the lower bead ring 5 is lowered to the vulcanization position, and then the unvulcanized tire to be vulcanized is carried in and sequentially proceeds to the vulcanization step. You. By the way, a part of the solidified rubber fragments and the release agent powder that have penetrated into the mold mating surface and the air vent hole generated when the tire is peeled off from the mold are partially removed from the inner periphery of the lower bead ring 5 and the lower mold 4. Although it enters between the parts, the entered rubber fragments and the like are discharged while dropping under their own weight through the groove 21a,
The airflow around the lower bead ring 5 generated by the subsequent lowering of the lower bead ring 5 helps discharge of the above-mentioned debris such as rubber and acts to prevent accumulation on the upper surface of the outer cylinder 20.

(Second Embodiment) FIGS. 3 to 5 show a second embodiment of the center mechanism of the tire vulcanizer according to the present invention.
Here, FIG. 3 is a cross-sectional view showing a main part of a platen type vulcanizer incorporating another central mechanism embodying the present invention, and FIG. 4 is a partial cross-sectional view taken along line BB of FIG. 5 is a partial cross-sectional view taken along the line CC.

The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only the different parts will be described below. 27 is an outer cylinder corresponding to the outer cylinder 20, and 28 is an inner cylinder corresponding to the inner cylinder 21. As shown in FIG. 4, a plurality of bushes 29 made of a material suitable for forming a sliding surface, for example, a copper alloy,
Are fixed intermittently in the circumferential direction by screws 30, and the outer peripheral surface of the bush 29 is formed with a sliding surface 29 a that engages with the inner peripheral cylindrical surface of the outer cylinder 27. In addition,
The head of the screw 30 is buried in the bush 29 so as not to protrude outward beyond the sliding surface 29a. On the other hand, the outer cylinder 27
As shown in FIG. 5, a plurality of materials suitable for forming a sliding surface, for example, a copper alloy 31 are intermittently provided in the circumferential direction at the upper end portion of the inner peripheral surface of the material. Sheng metal 3
A sliding surface 31a that engages with the outer cylindrical surface of the inner cylinder 28 is formed on the inner peripheral surface of the inner cylinder 1.

In the center mechanism of the second embodiment, the rubber pieces and the like that are generated when the tire is peeled from the mold and are intruded are discharged through the gap between the bush 29 and the spray-coated metal 31, and As in the first embodiment, it acts to prevent the outer cylinder 27 from being deposited on the upper surface.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. is there. For example, the outer cylinders 20 and 27 of the central mechanism may be suspended from the inner periphery of the platen 3 instead of the inner periphery of the platen 3. Also, the bush 2 to the inner cylinder 28
The fixing of 9 is not limited to the screwing, but it may be fixed by silver brazing or other methods.

[0019]

As is apparent from the above description, the tire vulcanizer provided with the center mechanism according to the present invention has the same structure as the outer cylinder suspended on the inner periphery of the platen or the lower mold. A groove extending in the vertical axis direction is formed intermittently in the circumferential direction on one of the sliding cylindrical surfaces with the inner cylinder, which is slidably ascended and descendable in the outer cylinder and has the lower bead ring attached to the upper end. Therefore, accumulation of rubber pieces and the like on the upper surface of the outer cylinder can be prevented, whereby damage and deformation of the sliding surface due to solidification of the rubber pieces and the like can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a tire vulcanizer according to a first example of an embodiment of the present invention.

FIG. 2 is a partial sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view of a main part of a tire vulcanizer according to a second example of the embodiment of the present invention.

FIG. 4 is a partial sectional view taken along line BB of FIG. 3;

FIG. 5 is a partial sectional view taken along line CC of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 base 2 heat insulating plate 3 platen 4 lower mold of tire mold 5 lower bead ring 8 tire 9 bladder 20 outer cylinder of central mechanism 21 inner cylinder of central mechanism 21a groove 21b sliding surface 27 outer cylinder of central mechanism 28 central mechanism Inner cylinder 29 Bush 29a Sliding surface 31 Sprayed overlay metal 31a Sliding surface

Claims (3)

[Claims] 1. A central mechanism of a tire vulcanizer for operating a lower bead ring forming a part of a tire mold and a bladder inserted into a tire being vulcanized, wherein the central mechanism is a platen or a lower metal. An outer cylinder suspended on the inner peripheral part of the mold, and an inner cylinder slidably ascended and descended in the outer cylinder, and the lower bead ring is attached to the upper end of the outer cylinder. A tire vulcanizer provided with a central mechanism, wherein a groove extending in a circumferential direction is formed intermittently in a circumferential direction. 2. A bush is intermittently fixed in a circumferential direction to at least one of an upper end portion of an inner peripheral surface of the outer cylinder and a lower end portion of an outer peripheral surface of the inner cylinder, and the sliding surface is formed on the bush. The tire vulcanizer according to claim 1, further comprising a center mechanism. 3. A metal is intermittently spray-coated in a circumferential direction on at least one of an upper end portion of an inner peripheral surface of the outer cylinder and a lower end portion of an outer peripheral surface of the inner cylinder. The tire vulcanizer according to claim 1, further comprising a center mechanism, wherein the sliding surface is formed.