JP4494053B2 - Tire vulcanizer - Google Patents

Description

  The present invention relates to a tire vulcanizing apparatus.

The tire vulcanizing apparatus has a lower mold and an upper mold that can be combined and opened with each other, and in some cases, a mold (a plurality of segments) that surrounds the outer periphery thereof. Some have a vulcanizing bladder provided in a mold state so as to be able to expand and contract inside the mold part (see, for example, Patent Documents 1 and 2).
The bladder can be inflated into a donut shape like a rubber tube of a tire, or can be folded into a small shape by shrinking, and the lower inner ring when pressed into a donut shape is pressed by the lower clamp ring from the inside in the radial direction. In this way, it is fixed to the upper surface of the center part of the lower mold.

On the other hand, a central mechanism is provided at the center of the lower mold, and by this central mechanism, a high-temperature and high-pressure medium can be supplied to or discharged from the bladder. Many center mechanisms have a center post that can be expanded and contracted in the vertical direction through the ring hole of the lower clamp ring, and the upper center of the bladder is fixed to the upper end of the center post. . There is also a type in which the center of the upper surface of the bladder is fixed by an elevating mechanism provided on the upper mold side.
In this type of tire vulcanizer, when the lower mold and upper mold are opened and the bladder is shrunk, a raw tire is loaded into the mold opening space, and then the lower mold and upper mold are combined. In addition, the bladder is inflated with a high-temperature and high-pressure medium, thereby pushing the outer surface of the tire against the inner surface of the lower die and the upper die while spreading the inside of the raw tire with the bladder. Molding and vulcanization to give the surface a predetermined shape. When this vulcanization is completed, the bladder is shrunk and folded by releasing the pressurized medium in the bladder to the atmosphere or discharged by vacuum, and then the lower mold and upper mold are opened, and the vulcanized tire It becomes the operating situation that takes out.
JP 2002-18857 A Japanese Patent Laid-Open No. 11-58387

  When vulcanizing a tire using a tire vulcanizer, if drain remains in the bladder at the time of vulcanization, the initial temperature rise during vulcanization will be greatly adversely affected. In particular, when a pressurized medium such as a gas vulcanization system or a steam vulcanization system is used as steam, residual drain is reduced on the tire during vulcanization as the pressurized medium is pushed into the bladder. The mold stays from the sidewall-corresponding region to the shoulder-corresponding region, delaying the temperature rise in these regions, and in an extreme case, may cause unvulcanized troubles.

In addition, residual drain in the bladder may re-evaporate when the vulcanized tire is removed, and if such re-evaporation occurs, the bladder will expand unexpectedly, which will be an obstacle to tire removal. was there.
When the bladder is contracted and folded, the drain remaining in the bladder is released to the atmosphere or discharged from the vacuum together with the pressurized medium from the pressurized medium recovery unit provided in the central mechanism. The lower clamp ring for fixing the bladder to the lower mold has a flat surface on the upper surface. Therefore, the drain tends to remain on the upper surface of the lower clamp ring, and the drain that has once remained cannot be discharged. there were.

  The present invention has been made in view of the above circumstances, and prevents drainage from remaining inside the bladder when the bladder shrinks, thereby preventing deterioration in the quality of the vulcanized tire caused by the drainage. Another object of the present invention is to provide a tire vulcanizer capable of preventing adverse effects on vulcanization efficiency (tire productivity).

In order to achieve the above object, the present invention has taken the following measures.
That is, the tire vulcanizing apparatus according to the present invention is provided with a lower mold and an upper mold that are capable of being combined with each other and capable of expanding and contracting in the combined state. a vulcanization bladder which is directed to a tire vulcanizing apparatus and a lower clamp ring for securing the lower side inner ring portion of the bladder at the center of the lower die from the radially inner side, on the upper surface of at least a lower clamp ring It is provided with a drain leading means to induce bladder in drain that flows onto the lower clamp ring during bladder contraction to the lower mold center, and has been drained induced drain guiding means in the center of the lower die drain recovery unit to discharge to the outside of the apparatus is provided with the drain guidance means, Resona Italy inward edge of said lower clamp ring extending from the outer periphery of the lower clamp ring radially Bottom is provided with a drainage groove inclined downward toward the center of the lower mold.

With such a configuration, the drain that has flowed out to the upper surface of the lower clamp ring when the bladder contracts is reliably recovered to the drain recovery part and does not remain, which hinders the initial temperature rise during the next vulcanization. There is no such thing. Therefore, there is no risk of unvulcanized troubles or poor tire removal after vulcanization.
Exhaust Mizumizo may be provided plural in a radial arrangement around the position serving as the center of the lower mold. Note that only one drainage groove may be provided.
When such a drainage groove is provided, the radially inner position of the upper surface of the lower clamp ring (the lower clamp ring itself may be used, or the central mechanism side may be provided if the central mechanism is provided at the center position of the lower mold. ), A concentric water collecting groove may be provided around the center position, and the drain collecting portion and the drain groove may be communicated with each other through the water collecting groove.

De Len induction means can also be provided by the drainage slope recessing the conical shape toward the upper surface of the lower clamp ring from its outer periphery to the center of the lower mold.
Preferably, the lower clamp ring is provided with a bank portion protruding upward at a corner portion on the upper surface side of the outer peripheral portion.

  In the tire vulcanizing apparatus according to the present invention, when the bladder is contracted, it is possible to prevent the residual drain from being generated inside the bladder. It is possible to prevent the adverse effects on the productivity).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of a tire vulcanizing apparatus 1 according to the present invention. As is clear from FIG. 4, the tire vulcanizing apparatus 1 according to the first embodiment includes a lower mold 2 and an upper mold 3, and a mold 4 that surrounds these outer peripheral portions with a plurality of segments. The lower mold 2 and the upper mold 3 can be combined and opened with each other by either one of the raising / lowering operations or the opposite raising / lowering operations. Further, in these combined states, a vulcanizing bladder 5 is provided inside the combined portion so as to exhibit a donut shape by being inflated.

A lower bead ring 9 is provided at the center of the lower mold 2, and a lower clamp ring 10 is provided so as to be superimposed on the lower bead ring 9. These rings 9 and 10 hold the lower inner ring portion lower portion 5a when the bladder 5 is inflated into a donut shape, and is fixed so as to be pressed toward the center of the lower die 2.
A center mechanism 12 is provided at the center of the lower mold 2, and the center mechanism 12 has a center post 15 that can be expanded and contracted in the vertical direction within the ring hole 13 of the lower clamp ring 10. An upper clamp body 16 is provided at the upper end of the center post 15, and the upper clamp body 16 moves up and down as the center post 15 extends and contracts.

The upper clamp body 16 fixes the upper surface side central portion of the bladder 5. The central mechanism 12 can supply or discharge a high-temperature and high-pressure medium to the bladder 5, whereby the bladder 5 expands and contracts. An upper bead ring 17 is provided at the center of the upper mold 3, and the upper bead ring 17 and the lower bead ring 9 described above are symmetrically arranged.
As is clear from FIGS. 1 and 3, the central mechanism 12 is provided with a drain recovery unit 20. The drain collecting unit 20 includes a drain port 22 that opens on the outer peripheral surface (a surface facing the radial outer side of the lower mold 2) with respect to the base 21 that supports the center post 15, and the drain port 22 from the outside of the apparatus. It has a drainage channel that leads to the right place. That is, the drain collecting unit 20 is configured to discharge the drain at the center position of the lower mold 2 when the drain flows from the radially outer side of the lower mold 2 toward the center position. It collect | recovers by 22 and drains it out of an apparatus.

As is apparent from FIG. 2, the lower clamp ring 10 has a donut shape due to the ring hole 13 provided in the center. A drain guide means 25 is provided on the upper surface of the lower clamp ring 10. The drain guide means 25 causes the drain that flows from the bladder 5 to the upper surface of the lower clamp ring 10 when the bladder 5 is contracted, to the drain collecting portion 20 via the upper surface of the lower clamp ring 10. It is for inducing.
The drain guiding means 25 of the first embodiment includes a drainage groove 26 provided along the radial direction of the lower clamp ring 10, and an annular water collecting groove 27 provided near the inner periphery of the lower clamp ring 10. It is as having.

A plurality of drain grooves 26 are provided, and as a whole, the drain grooves 26 are radially arranged in a circumferential direction with respect to the ring-shaped upper surface of the lower clamp ring 10 (a total of eight in the illustrated example), one by one. The book passes through the upper surface of the lower clamp ring 10 from the outer periphery to the inner periphery. Further, the drain bottom of each drainage groove 26 is provided with a downwardly inclined drainage gradient that is higher on the outer peripheral side of the lower clamp ring 10 and lower on the drain collecting unit 20 side.
In addition, the number of the drainage grooves 26, the mutual interval, the groove depth and the groove width, the degree of the drainage gradient, the groove shape (the cross-sectional shape is U-shaped, V-shaped, semicircular, or these are deformed in the longitudinal direction in combination) The detailed structure such as) may be appropriately determined according to the tire size to be vulcanized. However, if a rough example is given, the amount of drain on the tire side in the state where the bladder 5 is inflated is often about 1000 ml to 2000 ml, so the number of drain grooves 26 is preferably about 4 to 8 It becomes.

The water collecting groove 27 is an endless recess that concentrically surrounds the center of the lower mold 2 along the inner periphery of the ring hole 13 in the lower clamp ring 10, and is a step that steps down into the ring hole 13 in the illustrated example. It is as. Thereby, when the lower clamp ring 10 is in a state of surrounding the base portion 21 of the central mechanism 12, the water collecting groove 27 (steps thereof) comes into contact with the outer peripheral surface of the base portion 21 and exhibits a groove shape. The water collecting groove 27 is arranged so as to cross the front surface of the drain port portion 22 in the drain collecting portion 20.
The groove bottom level of the water collecting groove 27 is equal to or higher than the opening lower edge level of the drain outlet 22 in the drain collecting part 20 and, of course, lower than the opening upper edge level of the drain outlet 22. ing. Accordingly, the water collecting groove 27 and the drain collecting unit 20 are in communication with each other. Further, all the drainage grooves 26 described above are connected to the water collecting groove 27 in communication. As a result, all the drainage grooves 26 are in communication with the drain recovery unit 20 via the water collection grooves 27.

The maximum depth of the water collecting groove 27 is preferably within 50% of the wall thickness of the lower clamp ring 10 in order to prevent the strength of the lower clamp ring 10 from being lowered by providing the water collecting groove 27. It can be said.
In addition, the water collecting groove 27 can be easily processed by making the step as described above, and the processing cost can be suppressed to a low cost. However, the step is not necessarily limited. It is also possible to use a groove shape having side walls on both sides. In this case, what is necessary is just to cut out a groove side wall or make a hole in the part which corresponds to the drain port part 22 of the drain collection | recovery part 20, and to make it mutually communicate.

In the tire vulcanizing apparatus 1 having such a configuration, a raw tire is loaded between the lower mold 2 and the upper mold 3, and a high-temperature and high-pressure medium is supplied into the bladder 5 to inflate it. 5, the inside of the raw tire is expanded from the inside by pressing the outer surface of the tire against the inner surface of the lower die 2 and the inner surface of the upper die 3 to vulcanize the tire. Then, when the pressurized medium in the bladder 5 is released to the atmosphere or discharged by vacuum and the bladder 5 is contracted and folded, the drain in the bladder 5 flows out to the upper surface of the lower clamp ring 10.
The drain that has flowed out to the upper surface of the lower clamp ring 10 immediately flows into the nearest drainage groove 26, travels through the drainage groove 26 to the catchment groove 27, and eventually reaches the center of the catchment groove 27. It is guided to a drain port 22 provided in the mechanism 12. As described above, the drain in the bladder 5 is drained and removed through the drain guiding means 25 (the drain groove 26 and the water collecting groove 27) and the drain collecting section 20 (the drain port 22 and the like). There is no drain remaining on the upper surface.

Therefore, such drain does not hinder the initial temperature rise at the next vulcanization, and there is no risk of unvulcanized troubles or poor tire removal after vulcanization. Therefore, after the lower mold 2 and the upper mold 3 are opened, the vulcanized non-defective tire can be taken out without any problem.
In the lower clamp ring 10, a chamfered radius (indicated by an arrow X in FIG. 1) is given to a corner portion on the upper surface side of the outer peripheral portion, whereby the bladder 5 is contracted and folded when the bladder 5 is contracted and folded. The hook 5 is eliminated, and the bladder 5 can be protected from damage. As shown in FIG. 5, if a bank portion 30 that protrudes upward is provided in the chamfered rounded portion, it once flows out to the upper surface of the lower clamp ring 10 and is recovered by the drain guide means 25 by any chance. Even if there is a drain that cannot be removed, the drain can be prevented from flowing back into the expanded bladder 5, which is more preferable.

6 to 8 show a second embodiment of the tire vulcanizing apparatus 1 according to the present invention. The difference between the tire vulcanizing apparatus 1 of the second embodiment and the first embodiment described above is that the drain guiding means 25 is provided not only on the lower clamp ring 10 but also on the central mechanism 12 side. is there. That is, the drain groove 26 constituting the drain guiding means 25 is provided on the upper surface of the lower clamp ring 10 as in the first embodiment, but the water collecting groove 27 is not provided in the lower clamp ring 10. Instead, it is provided on the central mechanism 12 side.
In addition to the positional relationship between the drainage groove 26 and the water collecting groove 27, the effects and the like are substantially the same as in the first embodiment.

FIG. 9 shows a third embodiment of the tire vulcanizing apparatus 1 according to the present invention. In the tire vulcanizing apparatus 1 according to the third embodiment, the drain guiding means 25 uses a drainage gradient that causes the upper surface of the lower clamp ring 10 to be depressed with the center position of the lower mold 2 (the position where the drain collecting portion 20 is provided) as the lowest position. Is provided. Therefore, the upper surface of the lower clamp ring 10 has a shape that is also recessed in a slip shape.
In the drain guiding means 25 of the third embodiment, the drainage groove 26 and the water collecting groove 27 can be omitted, and the processing cost can be reduced in the lower clamp ring 10 and the base portion 21 of the central mechanism 12. I can expect. In addition, after providing a mortar-shaped drainage gradient on the upper surface of the lower clamp ring 10, it is possible to further provide a drainage groove 26 and a water collection groove 27.

The operational effects of the drain guiding means 25 provided by this mortar-shaped drainage gradient are also substantially the same as in the first and second embodiments described above.
By the way, this invention is not limited to each above-mentioned embodiment, It can change suitably according to embodiment. For example, there is no limitation on the mechanism for combining and opening the mold by the lower mold 2 and the upper mold 3, the presence or absence of a mold (segment), the detailed structure of the central mechanism 12, and the like.

It is the figure which expanded a part (lower clamp ring periphery) in FIG. It is the perspective view which showed the lower clamp ring used in 1st Embodiment. It is the perspective view which showed the drain outlet part of the drain collection | recovery part employ | adopted by 1st Embodiment. 1 is a side sectional view showing a first embodiment of a tire vulcanizing apparatus according to the present invention. It is the sectional side view which showed what added the partial improvement to the lower clamp ring of FIG. It is the sectional side view which expanded and showed the principal part (lower clamp ring periphery) in 2nd Embodiment of the tire vulcanizing apparatus which concerns on this invention. It is the perspective view which showed the lower clamp ring used in 2nd Embodiment. It is the perspective view which showed the drain outlet part of the drain collection | recovery part employ | adopted by 2nd Embodiment. It is the sectional side view which expanded and showed the principal part (lower clamp ring periphery) in 3rd Embodiment of the tire vulcanizing apparatus which concerns on this invention.

DESCRIPTION OF SYMBOLS 1 Tire vulcanizer 2 Lower mold | type 3 Upper mold | type 5 Bladder 10 Lower clamp ring 20 Drain collection | recovery part 25 Drain guide means 26 Drainage groove 27 Catchment groove
30 Tsutsumi

Claims (5)

Lower mold (2) and upper mold (3) provided so as to be able to be combined and opened with each other, and a vulcanizing bladder provided to be able to expand and contract inside when in the combined state (5) and a tire vulcanizer having a lower clamp ring (10) for fixing the lower side inner ring portion of the bladder (5) from the inside in the radial direction at the center portion of the lower mold (2),
At least on the upper surface of the lower clamp ring (10), drain guide means for guiding the drain in the bladder (5) flowing out onto the lower clamp ring (10) when the bladder (5) is contracted to the center of the lower mold (2) (25) is provided,
At the center of the lower mold (2), a drain recovery part (20) for discharging the drain guided by the drain guiding means (25) to the outside of the apparatus is provided .
The drain guiding means (25)
A drainage groove extending in a radial direction from the outer peripheral portion of the lower clamp ring (10), reaching the inner edge of the lower clamp ring (10), and the bottom of which is inclined downward toward the center of the lower mold (2) (26) A tire vulcanizing apparatus comprising: The drainage groove (26)
2. The tire vulcanizing apparatus according to claim 1, wherein a plurality of the tire vulcanizing apparatuses are provided in a radial arrangement around a center position of the lower mold (2) . A water collecting groove (27) having a concentric shape around the center position of the lower mold (2) is provided at a radially inner position on the upper surface of the lower clamp ring (10),
The drainage groove (26) communicates with the water collecting groove (27).
The tire vulcanizing apparatus according to claim 1 or 2 , wherein the water collecting groove (27) and the drain collecting part (20) are in communication with each other . The drain guiding means (25)
2. The tire vulcanizing apparatus according to claim 1 , wherein the tire vulcanizing apparatus is provided with a drainage gradient that allows the upper surface of the lower clamp ring (10) to be recessed in a mortar shape from the outer peripheral portion toward the center of the lower mold (2). . The lower clamp ring (10)
Bank portion to bulge upward on the upper surface corner portion of the outer peripheral portion (30) that is provided a tire vulcanizing apparatus according to any one of claims 1 to 4, characterized in.

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