JPH0371244B2 - - Google Patents

Description

[Detailed Description of the Invention] First, the tire vulcanizer proposed in Japanese Patent Publication No. 52-37518 has been well received by various users, but recently there have been improvements in cycle time reduction and bladder life improvement. , requirements for improving the performance of vulcanizers are becoming more stringent.

In conventional retractable bladder vulcanizers, during the press opening stroke after vulcanization, the lower grip of the bladder was raised at the same time as the press began to open, which caused the residual hot water in the bladder in the lower sidewall of the tire to escape. In addition to an increase in internal pressure due to re-evaporation of residual hot water, there is a risk that the tire and the bladder are in close contact with each other, which may prevent the bladder from being stored by lowering the lower grip portion of the bladder, which is a problem in terms of the bladder life.

Furthermore, due to this increase in internal pressure, etc., there is a risk of delay in restarting the press after the bladder is housed, which is unfavorable in terms of cycle time. Furthermore, when the press was opened, the area around the tire lower bead was peeled off from the lower mold first, making it difficult to reliably peel off the bladder from the tire lower bead.

The present invention solves the above drawbacks by simply adding control system parts and changing electrical control without complicating the bladder mechanism proposed in Japanese Patent Application No. 55-154795. This was proposed for the following purposes: (1) When the press is closed, that is, when the tire is in close contact with the mold, the lower grip part of the bladder can be raised to make it easier to separate the bladder from the tire bead. What I did.

(2) At the position where the press begins to open and the tire is lifted from the lower mold, the lower grip of the bladder is already in the lowered state (at least once lowered to the state before being raised), and before the bladder is retracted, To make it easier for residual hot water inside the bladder of the lower sidewall of the tire to drain out.

This relates to a method of operating a retractable bladder type tire vulcanizing machine characterized by The gripping part is lowered until it touches the lower ring, and then, while the vulcanized tire is held in the upper mold, the residual hot water inside the bladder of the lower sidewall of the tire is drained inside the lower ring. The present invention relates to a method of operating a retractable bladder type tire vulcanizer, which includes the steps of raising the upper mold to a position where the upper mold flows out, and retracting and storing the bladder in an outer cylinder. Further, the present invention includes a step of once raising the lower gripping portion of the bladder after completion of vulcanization of the tire by the retractable bladder type tire vulcanizer, a step of lowering the lower gripping portion that has been raised once, and a step of lowering the lower gripping portion of the bladder once raised. The step of lowering the grip until it touches the lower ring, and the step of lowering the vulcanized tire while holding it in the upper mold until the point where the residual hot water inside the bladder of the sidewall of the tire flows out inside the lower ring. The present invention relates to a method of operating a retractable bladder type tire vulcanizer, which includes the steps of raising an upper mold and retracting a bladder into an outer cylinder.

A mechanical clamp press that vulcanizes tires using a rubber bag called a bladder whose lower end or both ends are open is well known from Japanese Patent Publication No. 52-37518, etc., and therefore only the parts necessary for the present invention will be described below. Figure 1 shows one of the tire vulcanizers implementing the present invention.
1 is a partial cross-sectional view of a tire vulcanizer during vulcanization of a tire, showing an example; FIG. In the figure, an upper mold 5 and a lower mold 6 are attached to an upper hot plate 2 fixed to a beam 1 and a lower hot plate 4 fixed to a base 3, respectively.
is pressurized using a mechanical crank mechanism (not shown). The upper center portion of the bladder 7 is inserted into the upper end recess of the center post 8 and is clamped using a presser fitting 9 and a bolt 10. The lower end of the bladder 7 is held between the lower ring 11, the register ring 43, and the spacer 44 by the inner cylinder 12, and the central flange of the threaded rod 15 screwed into the screw hole provided at the lower end of the lower ring 11 is connected to the inner cylinder. It is held loosely by a disk 13 and a presser metal fitting 14 fixed to the lower end of the holder 12, and is tightened and fixed by rotating a threaded rod 15. The tire T in the molds 5 and 6 is heated from the outside by the hot plates 2 and 4 through the molds 5 and 6, while the tire T is injected from the plurality of nozzles 16 through the pipe 18 and the passage 17 in the lower ring 11. The pressure heat medium pressurizes the tire T to the inner surfaces of the molds 5 and 6 via the bladder 7, and also applies heat to heat the tire T from the inside, and passes through the nozzle 19 and the piping 20 connected to the nozzle 19. is discharged through.

The double shaft center post 8, 29 is connected to the lower ring 1.
1 and the bush 2 fixed to the inner surface of the large diameter center post 29.
2 and is incorporated into the lower ring 11 so as to be slidable in the axial direction (vertical direction).
The inner chamber 23 and the inside of the bladder 7 are communicated through a communication hole 21. Also, the room 23 inside the lower ring 11
Drain accumulated inside is discharged through piping 41.

Piston rod 25 of fluid cylinder 27 fixed to the bottom plate of outer cylinder 24 suspended and fixed to lower heating plate 4
The tip of the inner cylinder 12 is fixed to the inner cylinder 12.
The outer cylinder 24 and the outer cylinder 24 are slidably assembled at two positions, upper and lower, and the inner cylinder 12 slides up and down concentrically with the outer cylinder 24 by the operation of the cylinder.

A pressure receiving plate 28 is inserted between the lower part of the presser metal fitting 14 fixed to the lower end of the inner cylinder 12 and the inner surface of the bottom plate of the base 3, and the pressure receiving plate 28 receives the downward force of the pressure heat medium supplied into the bladder 7. base 3 through
It is received on the inside of the bottom. The pressure receiving plate 28 is fixed to the tip of a piston rod 31 of a fluid pressure cylinder 30 fixed to the base 3 via a bracket 32, and when the cylinder 30 is operated, the pressure receiving plate 28 slides on the inner surface of the bottom plate of the base.

A shaft 33 having a square hole on the inner surface is rotatably attached to the base 3 via a known bearing 34 and a bracket 42, and a chain wheel 35 is fixed below the shaft 33, and a chain wheel 35 is fixed below the threaded rod 15. Since the square shaft portion of is inserted into the shaft 33,
The chain 36 is driven by a known drive means (not shown).
The threaded rod 15 is rotated by rotating the chain wheel 35 through the threaded rod 1.
5 can be raised and lowered freely. A chuck 39 attached to the lower end of the ejector 38 is a known tire ejecting tool, and has a structure in which the sector plate 40 can be expanded and contracted in the radial direction by the vertical movement of the ram 37.

The method of the present invention is carried out as described below. Now, in FIG. 1, assuming that vulcanization of the tire T has been completed, the heat medium is discharged from the nozzle 19 via the pipe 20 and then opened to the atmosphere to bring the inside of the bladder 7 to approximately atmospheric pressure. At this time, residual hot water 51 remains near the lower sidewall of the tire. Next, the cylinder 27 is operated using a fluid pressure control valve (not shown), the inner cylinder 12 is raised to the vicinity of the bladder upper clamp portion of the center post 8, and the bladder 7 is peeled off from below the tire T. At the same time, the cylinder 30 is actuated, and the pressure receiving plate 2
8 from the presser metal fitting 14 at the lower end of the inner cylinder 12,
The inner cylinder 12 (lower ring 11) is lowered by its own weight. After that, the ram 37 is lowered, and the sector plate 4
0 is opened, the center posts 8 and 29 are lowered, and the bladder 7 is peeled off from above the tire T. Next, the press is opened, and the press is temporarily stopped by a signal from a rotary cam switch (not shown).

As shown in FIG. 2, when the press is temporarily stopped, that is, when the tire T is lifted up from the lower mold 6, the lower ring 11 (inner cylinder 12) is already in the lowered state (at least once before being raised). The remaining hot water 51 near the lower sidewall of the tire T is discharged from the nozzle 19 via the pipe 20. After that, the cylinder 27 is operated in the opposite direction, and the inner cylinder 12 (lower ring 1
1) is lowered, and the bladder 7 is drawn into and stored in the outer cylinder 24. After opening the breather and taking out the vulcanized tire, insert the green tire to be vulcanized next, operate the cylinder 27, raise the inner cylinder 12, and insert the bladder 7 into the tire T. , actuate the cylinder 30 to hold down the pressure plate 28 and press the metal fitting 14.
After the cylinder 27 is inserted under the cylinder 27, the cylinder 27 is operated in the reverse direction to seat the presser metal fitting 14 on the pressure receiving plate 28, and then the press closing process is started and saving vulcanization of the green tire is started.

Since the method of the present invention has the above-described structure and operation, according to the present invention, (1) the lower ring (inner cylinder ), it is easy to separate the bladder from the tire bead.

(2) Residual hot water near the tire sidewall can be easily drained before storing the bladder.

(3) This prevents the tire and bladder from coming into close contact with each other as described in (1) and (2) above, and prevents internal pressure increases due to re-evaporation of residual hot water, and allows for smooth bladder storage by lowering the lower ring (inner cylinder). Improved bladder life can be measured.

(4) By preventing the increase in internal pressure as described in (2) and (3) above, the press can be restarted more quickly after the bladder is retracted, thereby shortening the cycle time.

The following practical effects can be mentioned.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal cross-sectional views of the main parts of a retractable bladder type tire vulcanizer. Each figure shows a lifted state of the tire after sulfurization. T: tire, 1: beam, 2: upper hot plate, 3: base, 4: lower hot plate, 5: upper mold, 6: lower mold,
7: Bladder, 8: Center post, 9: Holder metal fitting,
11: Lower ring, 12: Inner cylinder, 24: Outer cylinder, 2
8: Pressure receiving plate, 40: Sector plate.

Claims (1)

[Scope of Claims] 1. An outer cylinder having a tire curing mold assembled to a mold opening/closing mechanism via a hot plate, and for retracting and housing a bladder when mounting and removing a tire; and the outer cylinder. an inner cylinder that is slidable therein; a lower ring that directly or indirectly holds the lower open end of the bladder between the inner cylinder;
In a bladder retractable tire vulcanizer having a bladder operating mechanism including a center post that grips the upper part of the bladder and relatively moves it closer to the lower open end of the bladder, (a) after the completion of vulcanization of the tire, inside the bladder; and (b) lowering the upper grip part of the bladder until it contacts the lower ring after lowering the pressure to approximately atmospheric pressure. (c) raising the upper mold to a position where the hot water remaining inside the bladder flows out to the inside of the lower ring; and (c) pulling the bladder into the outer cylinder after the condensed water flows out. How to operate the featured bladder retractable tire vulcanizer. 2. It has a mold for tire vulcanization that is assembled to the mold opening/closing mechanism via a hot plate, and has an outer cylinder that pulls in and stores the bladder when installing and removing the tire, and an inner cylinder that can slide inside the outer cylinder. a cylinder, and a lower ring that linearly or indirectly holds the lower open end of the bladder between the inner cylinder and the inner cylinder;
In a bladder retractable tire vulcanizer having a bladder operating mechanism including a center post that grips the upper part of the bladder and relatively moves it closer to the lower open end of the bladder, (a) after the completion of vulcanization of the tire, inside the bladder; After lowering the pressure to approximately atmospheric pressure, the lower bladder grip is once raised; (b) the lower bladder grip, which has been raised once, is lowered; and (c) the upper grip of the bladder is lowered to the lower ring. (d) Then, while the tire is held in the upper mold, the metal mold is lowered until the residual hot water inside the bladder of the lower sidewall of the tire flows out into the lower ring. A method for operating a retractable bladder type tire vulcanizer, comprising the steps of: raising a mold; and (e) retracting and storing a bladder into an outer cylinder after the condensed water has flowed out.