JPS58160136A - Operating method for bladder pull-in type tire vulcanizer - Google Patents

Abstract

PURPOSE:To pass residual hot water in the vicinity of a lower side wall section easily by lifting an inner ring under the state in which a press is closed and easily exfoliating a bladder from a tire bead section while bringing a lower ring to a falling state at the beginning of the opening of the press. CONSTITUTION:A thermal medium is discharged from a nozzle 19 through a piping 20 after a tire T is vulcanized completely, and the inside of the bladder 7 is opened to atmospheric pressure. An inner cylinder (the lower ring) 12 is lifted near a center post 8 by a cylinder 27, the bladder 7 is stripped off from the lower section of the tire T while a pressure receiving plate 28 is removed from the hold-down fitting 14 of the lower end of the inner cylinder 12 by the cylinder 27, and the inner cylinder 12 is dropped by its own weight. A ram 37 is dropped, a section plate 40 is opened, center posts 8, 29 are dropped, and the bladder 7 is stripped off from the upper section of the tire T.

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 the cycle time and the plug life. , requirements for improving the performance of vulcanizers are becoming more stringent.

In conventional plug retractable vulcanizers, in the press opening stroke after vulcanization, the lower ring (inner cylinder)
Because the tire was being raised, there was a risk that residual hot water near the bottom sidewall of the tire would be difficult to drain. As described above, due to the tight contact between the tire and the plug and the increase in internal pressure due to re-evaporation of residual hot water, there is a risk that the lower ring (inner cylinder) may be prevented from being housed by lowering the plug, which is a problem in terms of the life of the plug.

Furthermore, due to this increase in internal pressure, etc., there was a risk of delay in restarting the press after the plug was housed, and the cycle tie μ was also unfavorable. Furthermore, when the press is opened, the vicinity of the tire lower bead 9 is peeled off from the lower mold first, making it difficult to reliably peel off the plug 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 plug mechanism proposed in Japanese Patent Application No. 55-154795. This was proposed for the following purposes: (1) By raising the lower ring (inner cylinder) when the press is closed, that is, when the tire is in close contact with the mold, it is easy to separate the plug from the tire bead P. What I did.

(2) When the press starts to open and the tire is lifted from the lower mold, the lower ring (inner cylinder) is already in the lowered state (being pushed down by the program), so the plug is retracted. First, we made it easier to remove residual hot water near the bottom wall of the tire.

This relates to a method of operating a plug retractable tire vulcanizing machine, which is characterized in that after the completion of tire vulcanization by the plug retractable tire vulcanizer, the inside of the plug is lowered to atmospheric pressure, and then the center post is lowered. The first step is to lower the vulcanized tire until it contacts the ring, the second step is to raise the upper mold to open the frame while holding the vulcanized tire in the upper mold, and the second step is to store the plug. The present invention relates to a method of operating a plug retractable tire vulcanizer consisting of three steps. Further, the present invention applies to a tire after vulcanization is completed using a plug retractable tire vulcanizer.

a first step of raising the inner cylinder and the lower ring; a second step of removing the pressure receiving plate and dropping the inner cylinder and the lower ring under their own weight;
3. Lower the center post until it touches the lower ring.
During the process and in the evening after vulcanization, with the ear held in the upper mold,
The present invention relates to a method of operating a plug retractable tire vulcanizer characterized by comprising a fourth step of raising the upper mold to open the frame, and a fifth step of storing the plug.

A mechanical clamp press that vulcanizes tires using a rubber bag called a plug with its lower end or both ends open is well known from Japanese Patent Publication No. 37518/1983, and therefore only the parts necessary for the present invention will be described below. FIG. 1 shows an embodiment of a tire vulcanizer embodying the present invention, and is a partial sectional view of the tire vulcanizer during vulcanization of a tire. In the same figure,
An upper mold 5 and a lower mold 6 are attached to the upper hot plate 2 fixed to the beam 1 and the lower hot plate 4 fixed to the base 3, respectively.
is pressurized using a mechanical crank mechanism (not shown). The upper center portion of the plug 7 is inserted into the upper end recess of the center post 8 and is held in place using a presser fitting 9 and a bolt 10. The lower end of the plug 7 is connected to the inner cylinder 12 through the lower ring 11, the register ring 43, and the
held in between.

A central flange of a threaded rod 15 screwed into a threaded hole provided at the lower end of the lower ring 11 is loosely held by a disk 13 and a presser fitting 14 fixed to the lower end of the inner cylinder 12, and the screw It is tightened and fixed by rotating the 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, and on the other hand, it passes through the pipe 18 and the passage 17 in the lower ring 11 and is heated by a plurality of nozzles 16.
The injected pressure heat medium pressurizes the tire T against the inner surfaces of the molds 5 and 6 through the plug 7, generates heat, heats the tire T from the inside, and is connected to the nozzle 19 and the nozzle 19. It is discharged through the pipe 2o.

The double shaft center boss) 8.29 includes a bush 26 fixed to the upper inner surface of the lower ring 11 and a large diameter center boss 2.
It is guided by a bush 22 fixed to the inner surface of the lower ring 9 and is incorporated into the lower ring 11 so as to be slidable in the axial direction (vertical direction). We are well connected. Further, the drain accumulated in the chamber 23 in the lower ring 11 is discharged through the pipe 41.

The tip of the piston rod 25 of the fluid cylinder 27 fixed to the bottom plate of the outer cylinder 24 suspended and fixed to the lower heating plate 4 is fixed to the inner cylinder 12, and the inner cylinder 12 and the outer cylinder 24. are slidably assembled at two locations, 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 plug 7. It is received on the inner surface of the bottom of the Y-sumi. The pressure receiving plate 28 is fixed to the tip of a piston rod 61 of a fluid pressure cylinder 60 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 its inner surface is rotatably attached to the base 6 via a known bearing 34 and a bracket 42, and a chain wheel 35 is fixed below the shaft 36. Since the lower corner shaft portion is engaged and inserted into the shaft 36, it can be driven by a known drive means (not shown).
By rotating the chain wheel 65 via the chain 66, the threaded rod 15 is rotated and the threaded rod 1 is rotated.
5 can be raised and lowered freely. A chuck 39 attached to the lower end of the ejector 3 is a known tire ejecting tool and has a structure in which the sector plate 4o can be expanded and contracted in the radial direction by the vertical movement of the ram 67.

The method of the present invention is carried out as described below. Now, in FIG. 1, assuming that the vulcanization of the inner ear T has been completed, the heat medium is discharged from the nozzle 19 through the pipe 2o, and then the nozzle 19 is opened to the atmosphere, and the inside of the plug 7 is made equal to the atmospheric pressure. At this time, the residual hot water 51 remains near the side wall below 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 center post 8, and the plug 7 is connected to the tire T.
At the same time, the cylinder 30 is operated to remove the pressure receiving plate 28 from the presser fitting 14 at the lower end of the inner cylinder 12, and then the inner cylinder 12 (lower ring 11) is lowered by its own weight. After that, the ram 37 is lowered.

While opening the sector plate 40, center post 8.
29 and peel off the plug 7 from above the tire T. Next, the press is opened, and a signal from a rotary cam switch (not shown) is received to temporarily stop the press.

As shown in FIG. 2, when the press is temporarily stopped, that is, when the tire T is lifted from the lower mold 6, the
Since the lower ring 11 (inner cylinder 12) is in the lowered state (pressed down by the program), the residual hot water 51 near the lower sidewall of the tire T is discharged through the nozzle 19 through the pipe 20. be done. Thereafter, the cylinder 27 is operated in the reverse direction to lower the inner cylinder 12 (lower ring 11), and the plug 7 is drawn into the outer cylinder 24 and stored therein. Once the press is opened and the vulcanized tire is taken out, the next raw tire to be vulcanized is inserted, the cylinder 27 is activated, the inner cylinder 12 is raised, and the plug 7 is inserted into the tire T. Then, actuate the cylinder 30 to hold down the pressure receiving plate 28 and press the metal fitting 1.
4, the cylinder 27 is operated in the opposite direction to seat the presser metal fitting 14 on the pressure receiving plate 28, and then the press close process is started and saving vulcanization of the green tire is started.

Since the method of the present invention has the above-mentioned configuration 1, according to the present invention, (1) the lower ring (inner cylinder ), it is easy to separate the plug from the tire bead.

(2) Residual hot water near the tire side P-wall can be easily drained before storing the bladder.

(3) This prevents the tire and the plug from coming into close contact with each other as described in (11, +2) above, and prevents internal pressure increases due to re-evaporation of residual hot water, and allows the plug to be stored smoothly when the inner cylinder descends. Improved lifespan can be measured.

(4) By preventing the increase in internal pressure, etc. described in +2) and (3) above, the press can be restarted quickly after the plug is housed, and therefore the cycle time can be shortened.

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 plug retractable tire vulcanizer. Each figure shows a lifted state of the tire after sulfurization. T: Tire, 1: Beam, 2: Top hot plate. 3 knees? -S, 4: Lower hot plate, 5: Upper mold. 6: Lower mold, 7: Plug, 8: Center post. 9: Presser metal fitting, 11: Lower cylinder, 12: Inner cylinder. 24: Outer cylinder, 28: Pressure receiving plate, 40: Sector plate.

Claims (2)

[Claims] (1) After the completion of vulcanization of the tire by the plug-retractable tire vulcanizer, the first step is to lower the pressure inside the plug to atmospheric pressure, and then lower the center post until it comes into contact with the lower ring;
A plug retractable tire vulcanizer comprising a second step of lifting the stopper mold to open the frame while holding the vulcanized tire in the upper mold, and a third step of storing the plug. Method of operation. (2) a first step of raising the inner cylinder and the lower ring after the tire is vulcanized by the plug retractable tire vulcanizer;
The second step is to remove the pressure plate and let the inner cylinder and lower ring fall under their own weight, the sixth step is to lower the center post until it touches the lower ring, and the vulcanized tire is held in the upper mold. A method of operating a plug retractable tire vulcanizer, characterized in that a fourth step of raising the upper mold to open the frame and a fifth step of storing the plug are the same.