JPH0136409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As a central mechanism in a tire vulcanizer, the present invention is intended to improve productivity by particularly shortening the time required to replace elastic molded bodies, and to simplify the ring mechanism for holding elastic molded bodies. This invention relates to a device that enables easier operation and also facilitates the necessary operations for changing tire sizes.

As is well known, in tire vulcanizers, elastic molded bodies such as rubber bags, commonly known as bladders, which can be expanded and contracted, are used to shape the inner surface of green tires and to support the vulcanization internal pressure during vulcanization. It is used together with a vulcanization mold, and a central mechanism is used as the expansion/contraction drive mechanism for this elastic molded body. As is known, the central mechanism is located at the center of the fixed lower mold and is installed on the vulcanizer base via a knockout lever so that it can be raised and lowered freely, and is a lift equipped with means for supplying a thermopressure medium such as steam or hot gas. The main members are a cylinder and a piston rod that is inserted into the cylinder so as to be able to rise and fall. By gripping the upper end of the elastic molded body removably with the installed upper ring mechanism, the expansion and contraction deformation of the elastic molded body, that is, the inner surface of the green tire, is caused by the vertical movement of the upper ring mechanism that accompanies the raising and lowering of the piston rod. It is customary to make it possible to move along and detach the piston rod, and also to take out the vulcanized tire.In this case, water pressure or other fluid pressure is used as a means for raising and lowering the piston rod, and a ball screw shaft and a ball screw shaft are used to raise and lower the piston rod. It is also known that there are two types, one based on mechanical means that converts the rotational movement of a shaft or the like into vertical linear movement. One problem common to all types of central mechanisms is that in the upper and lower ring mechanisms that grip both upper and lower ends of the elastic molded body, it takes time to replace and remove the elastic molded body. Conventionally, as a solution to this problem, a method has been adopted in which the upper and lower ring mechanisms and the elastic molded body are assembled outside the vulcanizer, and this assembly is assembled into the central mechanism, but this method requires an assembly with a considerable weight. Not only does it take time to transport it inside and outside the vulcanizer, but it also takes a considerable amount of time to assemble it to the central mechanism.
Furthermore, since the assembly is carried out on a cooled ring, there are disadvantages such as the need for preheating after assembly, making it less than perfect. There are also problems such as inconvenience in replacement and disadvantages in supplying thermopressure medium.

That is, for example, in the lower ring mechanism of the central mechanism as described in Japanese Patent Publication No. 39-14502,
The lower end of the elastic molded body is held between two members: the plate ring provided at the upper end of the lift cylinder head and the bead ring, so when replacing the bead ring when changing tire size, first The shaped ring had to be removed from the cylinder head, and its disassembly and assembly was troublesome.

In particular, plate rings and bead rings are heavy and difficult to install and remove.

Furthermore, each bead ring suitable for each tire size must be provided with a threaded portion for vertical movement.
The production cost of bead rings was increasing.

The present invention solves the above-mentioned problems, significantly facilitates and speeds up the replacement and removal of the elastic molded body, and also facilitates tire size conversion. As a central mechanism for driving the expansion and contraction of the molded body, there is a lift cylinder that can be raised and lowered, a lower ring mechanism that is provided on the lift cylinder head and that holds the lower end of the elastic molded body in a downwardly folded manner, and a lower ring mechanism that is mounted on the lift cylinder and that can be raised and lowered. It consists of an inserted piston rod equipped with a height adjusting member, and an upper ring mechanism provided at the upper end of the rod to clamp the upper end of the elastic molded body. The lower clamp ring 16 has an inner diameter larger than the outer diameter of the lower clamp ring 16 and is arranged in the outer peripheral area of the lower clamp ring 16, and the inner peripheral edge of the green tire 22 is disposed on the outer peripheral surface of the lower clamp ring 16. The abutting lower bead ring 15 and the lift cylinder head 1
1, a lower seat ring 13 that is vertically movable and covers the lower surface of the lower clamp ring 16 and connects the lower part of the lower bead ring 15 in a detachable manner; and the lower clamp ring 16.
It consists of split rings 14, 14 that are detachably inserted into a space surrounded by the lower surface of the lower clamp ring 16, the inner peripheral surface of the lower bead ring 15, and the upper surface of the lower seat ring 13, and the outer peripheral surface of the lower clamp ring 16 and the upper surface of the lower clamp ring 16. The lower end of the molded body 24 is held between the lower surface, the inner circumferential surface of the lower bead ring 15, and the upper surface of the split ring 14, and the upper ring mechanism is detachable via a mounting bolt screwed into the upper end of the piston rod. It consists of an upper mold ring and an upper clamp ring that are freely and overlappingly supported and clamp the upper end of the molded article.

The present invention will be described in detail below based on the illustrated embodiment.The illustrated example shows the present invention as a radial tire vulcanizer, and as its central mechanism, the piston rod is raised and lowered using hydraulic fluid pressure. This is an example of what was carried out in the first
The figure is a vertical front view of the entire central mechanism, with the left side from the center line showing the state during vulcanization, and the right side showing the raised state of the upper ring mechanism, with the fixed lower die 19 on the vulcanizer base 31. The fixed lower mold 1 is installed via a heating plate 18 and includes a lower dome 32.
The movable upper mold 20, which can be opened and closed at the upper mold 9, is equipped with an upper bead ring 25, and is connected to a crank gear, as is known, via a heating platen 21, an upper platen support 33, and an upper mold height adjustment device 34, etc. It is connected and supported to the press mechanism side of the vulcanizer by side links, top links, etc., and these vulcanizing molds are, of course, the same as those of the conventional example, and are not limited to the types shown in the drawings. Note that 35 indicates an upper shield for preventing heat dissipation from the mold.

The central mechanism of the present invention is a fixed lower mold 1 as shown in the figure.
The cylinder guide 10 is located at the center of the vulcanizer base 31, and is slidably mounted on the cylinder guide 10, which is fixedly installed on the vulcanizer base 31 side.Although not shown, it is supported so that it can be raised and lowered by a knock-out lever or the like. At the bottom of the lift cylinder 1, water pressure supply/discharge ports A and B for lifting fluid pressure are opened at different locations, and a spray pipe 8 is installed upright over port A located at the center of the bottom (mold center). The piston 3 attached to the lower end of the piston rod 2, which is loosely fitted into the cylinder 8 through the hollow part 2a, is slidably and tightly fitted between the inner circumferential surface of the cylinder 1 and the outer circumferential surface of the spray pipe 8. The piston 3 can be raised by the water pressure sent through the piston rod 2,
A through hole C is opened in a part of the circumference of the hollow part 2a of the piston 3 and the rod 2 to guide the water pressure sent through the port A to the upper surface of the piston 3 from the upper end of the opening of the spray pipe 8 and the hollow part 2a. This allows the piston 3 and piston rod 2 to be lowered.

Further, a spacer 7 is supported between the outer circumferential surface of the piston rod 2 and the inner circumferential surface of the cylinder 1, and is supported by the upper end of the piston 3 and fitted onto the outside of the rod 2, as a member for adjusting the rising height of the piston rod. A piston sleeve 5 is slidably fitted into the upper part of this spacer 7, and a piston spacer 6, which is integrated with the sleeve 5, is fitted onto the piston rod 2. At the upper end of the spacer 6, there is a piston sleeve 5 which is attached to the piston rod. A stroke spacer 9 as an adjustment member is connected and fitted onto the piston rod 2, and the piston rod 2, piston spacer 6 and stroke spacer 9 are connected to an integral cylinder head 11 which is the upper end of the lift cylinder 1.
The piston rod 2 is inserted into a central hole concentric with the mold center so that it can slide up and down, and an extension rod 4 is connected to the upper end of the piston rod 2 as a member for adjusting the rising height of the piston rod. Insert the upper ring mechanism mounting bolt 2 into the screw hole 36 provided at the center of the upper end of the piston rod 2.
8 is screwed in so that it can be inserted and removed freely.

In this central mechanism consisting of the lift cylinder 1 and the piston rod 2, which can be raised and lowered, FIG. 1, FIG. 2 showing a vertical side view in a direction orthogonal to FIG. As shown in , an internal gear 12 is rotatably mounted on the outer periphery of the lower part of the lift cylinder head 11, and the internal gear 12 is also rotatably mounted inside the head 11 and can be operated from outside the head. One lower bead ring 15 meshes with the pinion 17 and clamps the lower end of the elastic molded body 24 in a downward folded manner on the threaded portion 37 provided on the outer peripheral surface of the internal gear 12.
Although not shown in the lower end of the figure, the inner circumferential surface of the lower seat ring 13, which is integrally connected with bolts or the like, is threaded into the shape of a screw hole. In order to raise and lower the bead ring 13, the ring 13 is fixedly attached to the upper end of the cylinder head 11, and the lower end of the elastic molded body 24 is folded downward facing the lower bead ring 15, as shown in the second figure. A locking pin 30 implanted and fixed between the lower clamp ring 16 and the head 11 is inserted through the head 11. Furthermore, in the present invention, over the upper surface of the lower seat ring 13, that is, the bottom inner peripheral surface of the lower bead ring 15,
A split ring 14 for support, which is divided into two parts, for example, is removably installed inside the seat ring 13 through support, and this split ring 14 is attached to a lower bead ring 15 and a lower clamp ring 16.
In the illustrated example, the lower end of the elastic molded body 24 is supported on this split ring 14. Needless to say, the lower bead ring 15 is removably engaged with the fixed lower mold 19 and supports the bead portion of the green tire 22 that is charged and set on the lower mold 19. The upper end of the head 11 and the lower clamp ring 16 are used to communicate with the inlet port D and outlet port E of the thermopressure medium (steam, etc.) as shown in the second figure, so that the thermopressure medium is directed in the tire radial direction. A thermopressure medium ejection nozzle 29 is provided to eject the fluid radially.

The upper ring mechanism for clamping the upper end of the elastic molded body 24 to the upper end of the piston rod 2 includes:
As shown in FIGS. 1 and 2, the upper mold ring 26 and the upper part are shaped so that they can be assembled vertically in an overlapping manner by means of a mounting bolt 28 that is tightened into a screw hole 36 provided at the upper end of the rod 2 mentioned above. It has a structure in which the upper end of the elastic molded body 24 is held between the clamp ring 27 and the clamp ring 27 in an inwardly folded manner.

According to the central mechanism of the present invention, by supplying water pressure into the lift cylinder 1 from port B to raise the piston 3 as shown on the right side of FIG. 1, the piston rod 2 is raised to the highest position shown in the figure. As a result, the elastic molded body 24 also expands, making it possible to charge and set the green tire 22 onto the fixed lower mold 19, thereby allowing the green tire 22 to be loaded through the paddle 23 or the like in a tire loader such as a vertical loader. The input is set. At this time, the movable upper mold 20 is in the open retracted position via a crack press mechanism or the like. When the charging of the green tire 22 is completed, the piston rod 2 is lowered to begin a shaping process in which the stretched elastic molded body 24 is brought into contact with the inner surface of the tire 22 as shown by the chain line on the right side of the figure. In this case, the water pressure supply from port B is switched to the water pressure supply from port A. As a result, the water pressure from port A rises from the upper end of the spray pipe 8 through the hollow part 2a of the piston rod 2 and from the through hole C. It acts on both the upper surface of the piston 3 in the raised position and the lower surface of the piston sleeve 5, which is also in the raised position, pushing up the piston sleeve 5, the piston spacer 6, and the stroke spacer 9, while lowering the piston 3, thereby lowering the piston rod. 2 also descends,
Upper mold ring 25 Upper clamp ring 27
At the same time, the elastic molded body 24 was deformed due to its flexible elasticity, and along the inner surface shape of the green tire 22, as shown in the figure, the upper clamp ring 27 came into contact with the stroke spacer 9 supported upwardly. The lowering is temporarily stopped at this position, which is the stacking height position, and along with the preshaping lowering, low-pressure heat is introduced into the elastic molded body 24 through the thermopressure medium inlet port D shown in FIG. By supplying a pressure medium (such as steam), the molded body 24 is slightly expanded so that it evenly and sufficiently conforms to the inner surface shape. After this shaping process, the movable upper mold 20 is closed onto the fixed lower mold 19 via a known press mechanism including crank gears, side links, top links, etc. to perform mold clamping. The piston rod 2, which had been stopped at the height position, is lowered along with the upper mold 20 through the collision engagement with the upper mold ring 26 of the bead ring 25 on the upper mold 20 side and subsequent accompanying movement. , the vulcanization type closing as shown on the left side of FIG. 1 is performed, and the water pressure on the cylinder 1 side in the lower part is relieved by the press force. In this way, both the upper and lower molds 19 and 20 are heated and pressed, and the elastic molded body 2 is
The green tire is vulcanized under heat and pressure by continuously supplying and increasing the pressure of the thermopressure medium into the dome, and further by supplying the thermopressure medium into the dome.

The feature of the present invention is not in the contents of the vulcanization process, but in the quick and easy replacement and removal operation of the elastic molded body 24 as mentioned above. In this case, the entire lift cylinder 1 is raised above the fixed lower die 19 by operating a known knockout lever or the like, and the pinion 17 is rotated from outside the cylinder head 11 using a tool such as a wrench. Since the rotation of the pinion 17 rotates the internal gear 12 in meshing relationship, the lower seat ring 13 screwed into the threaded portion 37 formed on the outer circumferential surface of the internal gear 12 is prevented from being restrained by the rotation stop pin 30. Therefore, the outer lower bead ring 15, which is integrated with the ring 13 by bolt connection, descends in a straight line as well, so that there is a gap between the ring 15 and the lower clamp ring 16. The lower end of the elastic molded body 24, which is held in a downward folded manner, is freely released by the retraction of the lower bead ring 15, and the upper end of the elastic molded body 24 is inserted into the mounting bolt 28 through the threaded hole 36 of the rod 2. If you remove it, you can see the upper mold ring 2 that overlaps the upper and lower parts.
6. The upper clamping ring 27 can be easily opened, thereby also freeing the upper end immediately.
Removal of the elastic molded body 24 is very quick and easy, and mounting clamps at both upper and lower ends of the new elastic molded body 24 can be very easily and quickly disposed of by performing the opposite procedure to that described above. As described above, the replacement and removal of the elastic molded body 24 can be carried out extremely easily on the central mechanism without requiring the effort and time required in the conventional case. Furthermore, the features of the present invention can be extremely advantageously exhibited in other respects due to the above configuration. That is, in a tire vulcanizer equipped with such a central mechanism, when taking out a vulcanized tire, as is well known, after the movable upper die 20 is opened and retracted, the entire lift cylinder 1 is raised and the vulcanized tire is removed. The cured tire is released from above the fixed lower mold 19 and raised together with the lower bead ring 15, and then the elastic molded body 24 is pulled out from the inner surface of the cured tire.
To remove the tire, a large lifting force is required to lift the entire lift cylinder 1 and the tire, and during tire vulcanization, a large lifting force is required to lift the entire lift cylinder 1 and the tire. Cylinder 1 due to thermopressure medium pressure, that is, vulcanization internal pressure.
A large downward force will be applied to the entire structure. In response to these external forces, according to the central mechanism of the present invention, the lifting force or the pushing down force is applied from the lower clamp ring 16 to the elastic molded body 24 and the support split ring 1 in the illustrated lower ring mechanism.
4, the lower bead ring 15 is supported on the lower die 19 side, and no force is applied to the connecting bolt that integrates the lower seat ring 13 and the lower bead ring 15. Significant benefits arise from streamlining and simplifying the structure of the lower ring mechanism. At this time, in the lower bead ring 15 and the lower seat ring 13, the elastic molded body 24
Since it is only necessary to connect the force that is sufficient to expand and contract the
It also becomes possible to improve the durability of the lower ring mechanism and reduce damage. Also, when changing the tire size to be vulcanized, lower bead ring 15
It is necessary to replace the lower bead ring 1 and the lower bead ring 15 in the same way as the operation described above.
5 and removed the elastic molded body 24,
It is also necessary to remove split ring 14, but the same ring 1
4 is in the form of a split ring, such as a split ring, so the lower bead ring 15 is the lower seat ring 1.
3 and take it out upwards, it can be easily removed by sliding it horizontally, and it is also very easy to install a new one, and these are also extremely easy to operate and handle compared to the conventional lower ring mechanism. This is a huge advantage. In addition, tire vulcanizers are designed to be able to vulcanize tires of various sizes, as is known, and for this purpose, the central mechanism is designed such that the rising and falling heights of the piston rod 2 are However, in the central mechanism of the present invention, the spacer 7 and the extension as shown in the figure are used as adjustment members for the rising height of the piston rod 2. By providing a stroke spacer 9 on the outer periphery of the piston rod 2 as a height adjusting member for the rod 4 or the lowering height, a function corresponding to each size can be obtained.

In addition, in the illustrated embodiment, the central mechanism of a piston rod lifting method using fluid pressure (water pressure) is shown as an example, but the upper and lower ring mechanisms that clamp the upper and lower ends of the elastic molded body in particular of the present invention are Of course, it goes without saying that it is fully applicable to center mechanism types other than the one shown in the illustration, and the independent lifting mechanism of the lower bead ring 15 can achieve rotational movement by the rotation of the pinion and internal gear in the example. It goes without saying that other types than those that convert into vertical linear motion can also be adopted, and these are included in the central mechanism of the present invention.

According to the present invention, it is composed of a lower ring mechanism, a lower clamp ring fixed to the cylinder head, a lower bead ring, a lower seat ring, and a split ring, and the lower clamp ring is not removed from the cylinder head. Since the lower bead ring is removable, it is easy to replace the lower bead ring when changing the tire size.

Furthermore, since the lower bead ring is not provided with a threaded portion for vertical movement, its manufacturing cost is lower than that of a conventional bead ring provided with a threaded portion for vertical movement.

Furthermore, in the present invention, the bead ring, which had a conventional integral structure, is separated into three parts: a lower bead ring, a lower seat ring, and a split ring.
The only part that needs to be replaced is the lower bead ring.
Its shape has been simplified and its weight has been reduced, resulting in lower costs and easier assembly.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing the left and right different operating states of an embodiment of the central mechanism of the present invention, Fig. 2 is a longitudinal sectional side view in a direction orthogonal to Fig. 1, and Fig. 3 is a transverse plane of the main part of the example of the pin internal gear mechanism. It is a diagram. 1... Lift cylinder, 2... Piston rod, 3... Piston, 11... Cylinder head,
12... Internal gear, 13... Lower seat ring, 1
4...Support split ring, 15...Lower bead ring, 16...Lower clamp ring, 17...
... Pinion, 19 ... Fixed lower mold, 20 ... Movable upper mold, 22 ... Green tire, 24 ... Elastic molded body, 26 ... Upper mold ring, 27 ... Upper clamp ring, 28 ... Mounting bolt.

Claims (1)

[Scope of Claims] 1. A green tire 22 charged into a vulcanization mold consisting of a fixed lower mold 19 and a movable upper mold 20, which are mutually openable and closable and equipped with heating and pressurizing means, is placed along the inner surface of the tire. A central mechanism for driving the elastic molded body 24 to expand and contract in a tire vulcanizer that vulcanizes the elastic molded body 24 through an expandable and contractible elastic molded body 24 and a thermopressure medium supplied inside the tire vulcanizer, wherein the central mechanism is movable up and down. Lift cylinder 1
, a lower ring mechanism provided on the cylinder head 11 to sandwich the lower end of the elastic molded body 24 in a downwardly folded manner, and a lower ring mechanism installed in the lift cylinder 1 so as to be movable up and down, and height adjusting members 4, 7, 9. It consists of a piston rod 2 and an upper ring mechanism provided at the upper end of the rod 2 to clamp the upper end of the elastic molded body 24, and the lower ring mechanism includes a lower clamp fixed to the upper part of the lift cylinder head 11. ring 16, and a lower bead ring 15 having an inner diameter larger than the outer diameter of the lower clamp ring 16 and disposed in the outer peripheral area of the lower clamp ring 16, and the inner peripheral edge of the green tire 22 contacts the outer peripheral surface of the ring 16. a lower seat ring 13 which is provided at the lower part of the lift cylinder head 11 so as to be movable up and down, covers the lower surface of the lower clamp ring 16, and removably connects the lower part of the lower bead ring 15; and the lower clamp ring. 16, the inner peripheral surface of the lower bead ring 15, and the upper surface of the lower seat ring 13.
The outer peripheral surface and lower surface of the lower clamp ring 16, the inner peripheral surface of the lower bead ring 15, and the split ring 14.
The upper ring mechanism is configured to sandwich the lower end of the molded body 24 by the upper surface of the piston rod 2.
A central mechanism in a tire vulcanizer characterized by comprising an upper mold ring 26 and an upper clamp ring 27 which are detachably supported in a superimposed manner and clamp the upper end of a molded body 24 via a mounting bolt 28 screwed into the upper end. .