JPS6140499Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a central mechanism called a bag adjustment device in a tire vulcanizer.

As is well known, in tire vulcanizers, a central mechanism called a bag adjustment device is used to perform shaping and other molding operations on green tires. It consists of a cylinder in the center, called a vulcanized tire, and a cylinder for raising and lowering the entire bag cylinder.A bladder is attached to the upper end of the bag cylinder, and the bladder can be inserted into a green tire, or the bladder can be removed from a vulcanized tire. It performs operations such as removing the vulcanized tire from the lower mold. Referring to the drawings, the general structure and operation of the conventional central mechanism, as well as the problems that occur in the conventional mechanism, are summarized as follows. That is, FIG. 1 shows an explanatory diagram of the entire central mechanism, and FIG. 2 shows an explanatory diagram of the main parts in its operating state. In FIG. A piston rod 31 that is internally movable up and down, a piston 32 fixed to the lower end of the rod 31, and the piston 32
A piston spacer 33 is slidably fitted onto the rod 31 at an upper portion of the piston rod 3;
1, a cylinder guide 35 for guiding the cylinder tube 30, a clamp ring hub 36 located above the guide 35, and a cylinder guide 35 for guiding the cylinder tube 30. The piston rod 31 has a lower clamp ring 37 as a main component for clamping the lower part of the bladder 1, and the piston rod 31 is a hollow cylinder as shown in the figure. A screwed pipe 38 is inserted into the hollow part of the rod 31, and at the bottom of the tube 30 there is a supply port 39 for a pressure medium (such as water) for raising and lowering the piston rod 31,
40, in order to raise the upper clamp ring 34, when water pressure is applied from the supply port 39, the piston rod 31, the piston 3
2. This is achieved by raising the piston spacer 33, and lowering the upper clamp ring 34 by applying water pressure from the supply port 40 and discharging the same water pressure from the outlet 41 through the pipe 38. , while the piston spacer 33 is crimped to the clamp ring hub 36, the piston rod 31 is
is provided so that it descends. Further, the lower clamp ring 37 is connected to the lever 43 by the cylinder 42.
44 so as to be raised together with the bag cylinder. That is, one end of the cylinder 42 is pivotally supported, and one end of the piston rod 45 is connected to the lever 4.
3, the other end of the lever 43 and one end of the lever 44 are pivotally connected, and the other end of the lever 44 is pivotally connected to the bottom of the tube 30 of the bag cylinder 42. The bag cylinder is raised together with the levers 43 and 44 through operation, and this raising of the lower clamp ring 37 is carried out in order to take out the tire after vulcanization is completed. Fig. 1 shows an example of the configuration of the most common center mechanism, and Fig. 2 shows the upper and lower clamp rings 34, 3 in such a center mechanism.
7. This shows an example of the main part structure and operating state of the bladder 1 held by this, and as shown in the figure, the upper clamp ring 34 is a clamp ring 34a.
The lower clamp ring 37 is composed of a clamp ring 37a and a bead ring 37b, and is attached to the upper end of the piston rod 31 via a fitting 45. 3
6 is removably attached to the outer periphery of the bladder 1 by screw fitting means, and the clamp ring hub 36 is provided with a pressure medium for supplying a heat medium such as steam or hot water into the bladder 1 as an internal pressure for shaping. Injection supply ports 36a are arranged at equal intervals around the circumference as shown in the figure, and heat medium supply pipes 46 are connected to these supply ports 36a, so that the heat medium is injected into the bladder 1 during shaping. There is. In the illustrated example, the upper clamp ring 34 is in the raised position together with the raised piston rod 31, and is in the process of descending from this position, and the position indicated by the dotted line indicates the shaping end position. In the figure, 47 is a green tire, 48 49 shows a part of a vertical loader known as an automatic loading device for transporting the tire 47 to the molding position, and 49 shows the lower mold of the mold divided into upper and lower halves, not shown. However, an upper mold of the same shape is superposed above the lower mold 49, and 50 indicates a heating plate for the lower mold.
All of these are publicly known, and the outline thereof is merely shown.

That is, in FIG. 2, the upper clamp ring 34
While lowering the loader, a heat medium such as steam is injected and filled into the bladder 1 from the injection supply port 36a of the clamp ring hub 36 as shown by the arrow, and the bladder 1 is guided by the blades (the part shown in the figure) of the vertical loader 48. , the green tire 47 is loaded from the bottom along the inner surface of the tire, and this lowering is due to the lowering of the entire bag cylinder, and the upper clamp ring 34 is lowered from the solid line position to the dotted line position, and here When the ring 34 hits the piston spacer 33 in the raised position due to water pressure, etc.,
The shaping work is completed with the height positioning. During this time, the vertical loader 48 closes its blades and rises away from the green tire 47, and through the expansion of the bladder 1, the green tire 47 is finally formed into a shape almost similar to the finished tire. This is a shaping operation. Thereafter, vulcanization molding will be performed using a mold shown as a lower mold 49. To be more precise, during this shaping, the bladder 1 is moved to the green tire 47 using the vertical loader 48.
When the first shaping is used to charge the tire 47 into the mold, and the second shaping is used to inflate the tire 47 to an extent slightly smaller than the inner diameter of the mold, the shaping heat such as steam required for the first shaping The pressure of the medium is about 0.15Kg/cm ² to 0.20Kg/cm ² , whereas the internal pressure required for the second shaping is about 1.5Kg/cm ² . The pressure setting of the heating medium (heating medium) is switched between two stages, and this can be done manually or automatically.

The above is an overview of the general form and operation of the conventional central mechanism of a vulcanizer, but such a central mechanism has the following problems.

That is, after introducing a heat medium such as low pressure steam as an internal pressure for shaping into the bladder 1 while holding the green tire 47 by the vertical loader 48, the upper clamp ring of the bladder 1 is inserted using the blades of the vertical loader 48 as a guide. 34 is lowered and the bladder 1 is loaded into the green tire 47, at the beginning of the introduction of low pressure steam, due to the cooling in the previous tire vulcanization process and the heat dissipation in the post-vulcanization removal process. , the bladder 1 and the upper clamp ring 34 are normally in a cooled state, so the introduced steam quickly drains. Especially in the conventional central mechanism, its lower clamp ring 3
Due to the structure of the bead ring 37b and the bladder 1 connected thereto, as shown as A in FIG.
This drain residue remains on the lower inner surface of the
This becomes a serious obstacle to uniform, fast and smooth shaping, and also makes it difficult to smoothly discharge the drain due to its structure. Furthermore, in FIG. 2, since the injection direction of the injection supply port 36a of the internal pressure heat medium provided in the clamp ring hub 36 is directed toward the inner surface of the bladder above the bladder equator plane, the inside of the bladder 1 is There are problems in that an even distribution and diffusion of internal pressure cannot be obtained, excessive retention in the lower part of the bladder, and a large amount of drain remaining.
Furthermore, the lowering position of the upper clamp ring 34 is determined by the piston spacer 33, and at this time, the internal pressure introduced into the bladder 1 and the water pressure for raising and lowering the upper clamp ring 34 are sealed by one packing. Therefore, especially if a seal failure occurs, the water pressure on the upper clamp ring 34 side will leak into the bladder 1 during shaping, causing poor shaping and eventually tire failure, and the seal is constantly exposed to hot water and steam. There is also the problem with seals that the seal itself has a short lifespan due to repeated high internal pressure and low operating water pressure. Furthermore, more important than the problems during shaping are the effects on the heating rate and uniformity during vulcanization. In particular, in the conventional type, the diameter of the internal pressure jet is quite inside compared to the diameter of the bladder clamp part, so there are problems in terms of temperature rise and uniformity due to the internal pressure during heating.
At this time, when only steam is introduced into the bladder as internal pressure, a large amount of residual drain due to its structure tends to hinder heating of the lower bead portion.

In addition, the bladder used during vulcanization is generally made of rubber bag material, but regular ones wear out in about a week, and special ones wear out in about three weeks, so it is essential to replace the bladder. Shortening the time is also one of the important factors for improving the operating rate of the vulcanizer. In the conventional structure, the bladder 1 and the upper and lower rings 34 and 37 for clamping are assembled outside the machine.
This assembly is usually carried into the machine, the lower clamp ring 37 side is rotated and attached to the threaded part provided on the clamp ring hub 36 of the central mechanism, and the upper clamp ring 34 is then fixed to the piston rod 31. With this mounting method, the assembled weight of the upper and lower clamp rings 34, 37 and the bladder 1 is about 30 kg for a general passenger car tire, and the work of transporting and installing it is quite time-consuming and difficult, and takes a long time. Various problems are still unresolved, such as problems in this regard.

The present invention addresses the above-mentioned problems in the conventional central mechanism by changing the structure of the clamp ring at the bottom of the bladder, preventing drain from remaining during shaping, and minimizing the amount of drain during vulcanization. It speeds up the heating around the lower bead and makes it uniform throughout. It also makes the tire heating of the vulcanizing internal pressure medium quick and uniform, and prevents the water pressure for driving the piston rod from leaking into the bladder during shaping. , and the bladder can be replaced by only replacing specific parts.The features are that the lower clamp ring has a bead ring that is lowered so that the lower end of the bladder can be folded downward and clamped; The main feature is that the clamp ring and the base ring, which supports both rings from below and is movable up and down, can be assembled and disassembled.

The present invention will be described in detail below based on the illustrated embodiment. FIG. 3 is an embodiment showing only the essential parts of the central mechanism according to the present invention, and the central mechanism according to the present invention includes the main parts other than the essential parts described below. , may be the same as those illustrated in FIGS. 1 and 2, so other parts than the essential parts are omitted. In Figure 3, 1 is the bladder;
2 is an upper clamp ring, and the ring 2 consists of a clamp ring 2a and a bead ring 2b, both rings 2a and 2b are assembled with bolts 3, and clamp the upper part of the bladder 1.
The clamp ring 2a is fixedly supported on the piston rod 5 by the bolt 4 as described above.
This piston rod 5 is housed in a cylinder tube 14 of a bag cylinder so that it can be raised and lowered by a pressure medium such as water pressure, and a piston 17 is fixedly installed at the lower end of the rod 5, and a piston spacer 1 is installed above the piston 17.
In the present invention, a locking protrusion 16a is provided at the upper end of the spacer 16, and the conventional (first and second)
As shown in the figure, the spacer 16 connects to the cylinder tube 14.
It is designed to be locked to the upper end of the tube 14 without being sunk inside.

Reference numeral 7 denotes a lower clamp ring according to the present invention, and as shown in the figure, the ring 7 includes a clamp ring 8 and a bead ring 9 that clamp the lower part of the bladder 1.
and a base ring 6 that supports both rings 8 and 9 from below and is fixed to the bead ring 9 with bolts 9a.In this case, in this invention, the clamp ring 8 is shown in detail in FIG. like,
It consists of a disk-shaped plate part 8a and a pipe part 8b projecting downward from the center of the plate part 8a, and the plate part 8b is attached to the upper end of the cylinder tube 14 at the upper part of the cylinder guide 21 supporting the cylinder tube 14. The pipe portion 8b is placed between the hub 10 and the piston spacer 16 on the piston rod 5 side, and is fixed to the hub 10 side with bolts 11. The lower end of the clamp ring 8 is connected to the upper end of the cylinder tube 14, and the plate portion 8a of the clamp ring 8 has an angle of incidence at which an internal pressure medium (steam or other material) is injected into the vicinity of the equatorial plane of the bladder 1. A plurality of medium supply ports 8c are evenly distributed around the circumference. As shown in the fourth figure, the tips of these supply ports 8c are all opened on the circumferential side of the plate portion 8a,
The rear end communicates with the annular circumferential groove 8d, and the annular circumferential groove 8
d communicates with a supply port 10a provided on the side of the clamp ring hub 10, and a medium supply pipe 22 is connected to the supply port 10a. Note that 8e is a locking portion of the bladder 1 provided on the circumferential side of the plate portion 8a, and the medium supply pipe 22 is located on the circumference of the hub 10.
Two pipes shall be provided symmetrically at 180 degree positions, and the medium supply port 8c has an internal pressure equal to that of the bladder 1.
8f are provided in the plate portion 8a on the inner side of the supply port 8c at regular intervals on the circumference, and are connected to the supply port 10a of the hub 10, and 8g is a return port, and 8g is a bolt. There are 11 mounting holes.

In the illustrated embodiment, a threaded portion 6a is formed on the inner circumferential side of the base ring 6, and an internal gear 12 that is threadedly engaged with the threaded portion 6a is rotatably held on the outer circumferential side of the clamp ring hub 10. By meshing the gear 12 with a pinion 13 disposed using the hub 10, the internal gear 12 is rotated by the rotation of the pinion 13, and the bolt 9a is attached to the base ring 6 and the ring 6 through the screw connection. A bead ring 9 connected to the bead ring 9 is provided so as to be movable up and down. In the other figures, 18 is a gasket on the piston 17, which is disposed on the cylinder tube 14 side and the piston rod 5 side, and seals the water pressure for driving the piston rod, 19 is a similar gasket on the spacer 16, and 20 is an internal pressure seal on the clamp ring hub 10. 23 is the clamp ring 8
24 is a green tire, 25 and 26 are upper and lower 2 gaskets.
A split-type mold, 27 indicates a heating plate, and 28 indicates a base.

In the present invention, in order for the internal pressure medium to be injected and collided with the clamp ring 8 of the lower clamp ring 7 near the equatorial plane of the bladder 1 as shown in the figure,
As in the illustrated embodiment, by lowering the position of the bead ring 9 so that the lower end of the bladder 1 is clamped between the clamp ring 8 in a downwardly folded manner, it is possible to The medium supply port 8c can be formed on the clamp ring 8 side at an angle where the internal pressure medium can be jetted and collided with the equatorial plane without any problem.

The above-mentioned FIG. 3 shows the state during vulcanization after shaping using the molds 25 and 26, but FIG. 5 shows the same state as the state shown in FIG. As described above, it goes without saying that the shaping operation itself is performed in the same manner as in the conventional method. FIG. 6 is a plan view showing the arrangement of the internal gear 12 and pinion 13, and shows the piston rod 5,
Components other than the piston spacer 16 and clamp ring hub 10 are shown removed.

The central mechanism according to the present invention is as described above,
Particularly, the feature of the present invention is that in the lower clamp ring 7 that clamps the lower part of the bladder 1, the bead ring 9
By lowering the position of the clamp ring 8, and by extension the entire ring 7, the position of the clamp ring 8 and, by extension, the entire ring 7 is lowered than before, thereby directing the medium supply port 8c to the clamp ring 8 near the equatorial plane of the bladder 1. The clamp ring 8 and the bead ring 9 can be formed under an angle of incidence that allows for good heat dispersion of the internal pressure during shaping and vulcanization, making it possible to speed up and make the heating effect uniform. ring 6
The base ring 6 is supported by a rotating mechanism with a pinion 13 and an internal gear 12, and the disassembly/assembly structure enables lifting and lowering, making it possible to significantly simplify and facilitate replacement of the bladder depending on the tire size. It is a summer point. That is, when supplying a medium for internal pressure into the bladder 1 during shaping and vulcanization, the injection supply port is provided in the clamp ring hub as shown in the first and second figures, due to its mechanism. Because the pressure is higher and the medium is injected above the equatorial plane, and the lower clamp ring is also located higher, a large amount of residual drainage is generated inside the bladder.
This will impede the uniformity and speed of tire heating.
Heat dispersion during heating also causes an imbalance between the top and bottom of the bladder. On the other hand, as in the present invention, by making the injection collide near the equatorial plane of the bladder 1,
Heat is distributed in a well-balanced manner within the bladder, and a uniform and rapid heating effect is expected regardless of whether it is above or below. The angle of incidence of the medium supply port 8c according to the present invention is
For example, by making the angle as low as about 15 degrees with respect to the horizontal plane, it is possible to accurately inject near the equatorial plane. In this case, it is difficult to design such an angle of incidence with the conventional lower clamp ring structure or with a supply port provided in the clamp ring hub, but in the present invention, as in the embodiment, the bead ring 9 is set low. By doing so, by mounting the clamp ring 8 on the clamp ring hub 10 in a crowned manner, it is possible to relatively provide both rings 8 and 9 at a lower position than in the past, and thereby the equatorial plane A supply port 8c having an angle of incidence toward the vicinity can be easily obtained. In this case, by lowering the bead ring 9, the lower part of the bladder is folded downward, which eliminates a large amount of drain remaining during shaping and facilitates its discharge. By minimizing the amount of drain, uniform and rapid heating of the tire by the internal pressure medium during vulcanization can be achieved, and particularly effective heating around the lower bead can be achieved. Further, by arranging the clamp ring 8 in a crowned manner on the hub 10, a wide plate portion 8a with a large diameter is obtained, the medium connection port 8c is arranged to open close to the bead portion, and the return port 8f is connected to the piston rod 5. By arranging them evenly, internal pressure circulation inside the bladder is also very good, which promotes uniform and rapid heating of the tire from the inside, shortens vulcanization time, and improves vulcanization. Production efficiency can be improved, and a larger space can be taken between the piston rod 5 and the return port 8f compared to the conventional types shown in Figs. Internal pressure seal 19,
By providing a drain port (not shown) with zero back pressure between the conventional hydraulic seals for driving the center mechanism, water pressure leaks and internal pressure leaks are guided to the outside, and the upper clamp ring 2 is removed during shaping. It is possible to prevent the water pressure from leaking into the bladder 1 when the cylinder is lowered, which stabilizes the shaping and prevents the tire from becoming defective. Since it can also prevent inflow, it also helps to save a lot of energy. The reason why the locking protrusion 16a is formed at the upper end of the piston spacer 16 is possible because a large space is provided between the return port 8f of the clamp ring 8 and the piston rod 5. During shaping, water pressure is applied to the lower part of the piston 17 to raise the piston rod 5 and the piston spacer 16, and the height is determined by the collision between the upper clamp ring 2 and the spacer 16, and then the molds 25 and 26 are fully closed. Then, the piston rod 5 spacer 16 piston 17 is lowered,
Furthermore, during vulcanization, the water pressure is released and the spacer 16 is lowered into the cylinder tube 14, but at this time, the locking protrusion 16a locks and the tube 1 of the spacer 16 is lowered.
This prevents the person from falling inside the room. In the conventional type, there is no space to provide such a locking protrusion as shown in Figures 1 and 2, and the spacer falls into the cylinder tube, so it is impossible to provide a seal on this spacer. On the other hand, in the present invention, since the spacer 16 is stopped, a gasket 19 for preventing internal pressure can be provided, which is useful for preventing the internal pressure and water pressure mentioned above from leaking into the bladder.

Furthermore, in the present invention, in the lower clamp ring 7, the bead ring 9 is detachably attached to the base ring 6 using the bolt 9a, so when it becomes necessary to replace the bladder clamp depending on the tire size, the entire clamp can be replaced. There is no need to replace the bead ring 9, just remove the bolt 9a and replace only the bead ring 9 with one according to the required size. This size exchange is limited to a limited range (for example, 12cm for passenger car tires).
~14″, 20~22″ for truck buses), but the fact that you only need to replace bead ring 9 is that
This significantly reduces the number of parts when changing the size, making it possible to shorten the replacement time.
Coupled with the vertical adjustment of the clamp ring 8 bead ring 9 by raising and lowering the base ring 6 using the 3 internal gears 12, assembly, installation, and replacement are easier than in the past.

As described above, according to the present invention, by modifying the lower clamp ring 7, the problem of conventional residual drain and the problem of uniform and rapid heating during shaping and vulcanization can be solved, and the trouble of replacing the bladder can be solved. It is excellent in that it is extremely simple, improves workability, and provides good shaping and vulcanization molding of tires.

[Brief explanation of the drawing]

Figure 1 is an overall longitudinal sectional front view of an example of a conventional central mechanism.
Fig. 2 is an explanatory diagram of the operating state of the concentric mechanism, Fig. 3 is an enlarged partial sectional view of the main part of the central mechanism according to the present invention,
Fig. 4 is a plan view of the clamp ring, and a sectional view taken along the line A-A. Fig. 5 is an explanatory diagram of the concentric mechanism in its operating state similar to Fig. 2. Fig. 6 is a plan view of the relationship between the internal gear and pinion. be. 1... Bladder, 2... Upper clamp ring, 5
...Piston rod, 6...Base ring, 7...
...lower clamp ring, 8...clamp ring,
9... Bead ring, 10... Clamp ring hub, 8c... Medium supply port, 5... Piston rod, 14... Cylinder tube, 16... Piston spacer, 17... Piston, 24... Green tire, 25, 26... Molding mold.

Claims (1)

[Scope of utility model registration request] A cylinder tube supported so as to be movable up and down; a piston rod installed in the tube so as to be movable up and down;
A central mechanism of a tire vulcanizer comprising a lower clamp ring supported on the upper end of the tube to clamp the lower part of the bladder, and an upper clamp ring supported on the upper end of the piston rod to support the upper part of the bladder, and equipped with internal pressure supply means for shaping. The lower clamp ring includes a bead ring and a clamp ring that are lowered so as to be able to clamp the lower end of the bladder in a downward folded manner;
The central mechanism of a tire vulcanizer is characterized in that it can be assembled and disassembled by three parts, including a base ring that supports both rings from below and can be raised and lowered.