JPH06315937A - Center mechanism of tire vulcanizing machine - Google Patents

Abstract

PURPOSE:To minimize the downward projection of a center mechanism and contain a cylinder device in a press frame at the time of transporting by changing the arrangement of the cylinder device. CONSTITUTION:In a center mechanism of a tire vulcanizing machine, a hub 4 for holding a lower part of a bladder is securely fixed to a top part of a cylindrical body 4c for sliding a vertically guiding part 30 provided on a press frame 34, and a center post 3 for holding an upper part of the bladder is slid in a center hole 4a of the hub 4. In this center mechanism, a cylinder device 31 is provided between the hub 4 and the center post 3 with a rod 31a showing up, and a hole 30a for passing the rod 31a of the cylinder device 31 through is opened around the guiding part 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a central mechanism of a tire vulcanizer which holds a bladder and ascends and descends above and below the center of a press, and in particular, the arrangement of a cylinder device can be changed to form a downward protruding portion. Only about what can be reduced.

[0002]

2. Description of the Related Art Conventionally, a central mechanism of a tire vulcanizer of this type is shown in FIG. In FIG. 3, the green tire T is seated on the lower mold 53 fixed on the base frame 51 via the lower mold mounting member 52 by a loader 55 having a chuck 54 and capable of moving up and down.
The center mechanism 58 is installed in the center of the lower mold mounting member 52 via a guide sleeve 59. The central mechanism 58 is arranged in a lower portion of the lift member 60 with a lift member 60 vertically inserted through a guide sleeve 59, a center post 61 installed in the lift member 60 so as to be vertically movable, and an extension direction facing upward. And a first cylinder device 64 disposed laterally of the second cylinder device 63 with the extension direction facing downward. The bladder 67 is provided at the upper end of the lift member 60. A bottom ring 68 for holding the lower part of the bladder 67 is held, and a top ring 69 for holding the upper part of the bladder 67 is held at the upper end of the center post 61. The tip end portion of the piston rod 64a of the first cylinder device 64 and the second cylinder device 63 are connected by a connecting member 72. By extending and contracting the piston rod 64a of the first cylinder device 64, the lift member 60 moves to the center. The center post 61 is independently raised and lowered by raising and lowering together with the post 61 and extending and contracting the piston rod 63a of the second cylinder device 63.

Next, the operation of the central mechanism of the tire vulcanizer having such a structure will be described. With the lift member 60 at the lowest position and the center post 61 at the highest position, the bladder 6 is
7 is stretched on the center of the lower die 53 as shown by the chain double-dashed line. Then, by lowering the loader 55 holding the green tire T by the chuck 54,
The green tire T is seated on the lower mold 53. When the green tire T is seated, the center post 61 is lowered to introduce the top ring 69 while introducing a pressure fluid such as steam or hot gas into the bladder 67 to expand the bladder 67.
To lower. Then, the bladder 67 is gradually curved and deformed to be fitted to the inner surface of the green tire T, and the bladder 67 is completely brought into close contact with the inner surface of the green tire T to perform shaping. When shaping is completed, the upper mold (not shown) is closed to the lower mold 53, and vulcanization molding is performed.

When the vulcanization molding is completed, the upper die is raised. Then, together with the center post 61, the lift member 60
Is lifted, the vulcanized tire T is peeled off from the lower mold 53 and lifted. Then, the center post 61 is raised and the lift member 60 is lowered to peel off the bladder 67 that is in close contact with the inner surface of the vulcanized tire T in a pull-out shape, and the vulcanized tire T is removed from the machine by an unillustrated unloading member. Then, one cycle of vulcanization molding is completed.

[0005]

In the central mechanism 58 of the tire vulcanizer described in the prior art, the second cylinder device 63 that raises and lowers the center post 61 independently with respect to the lift member 60 faces upward in the extension direction. And is arranged in series below the lift member 60, the second cylinder device 6
The first cylinder device 64 disposed laterally of the third cylinder device 63 and the third cylinder device 63 largely projects below the base frame 51. Therefore, when installing the tire vulcanizer,
The pit 75 is dug deeply on the floor, and the cylinder devices 63 and 64 are
However, there is a problem that the deeper the pit, the more cost is required for foundation work. Also, when transporting the tire vulcanizer,
There is also a problem in that the cylinder devices 63 and 64 protruding from the lower part of the frame interfere with each other, and a special mount for transportation is required.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to change the arrangement of the cylinder device so as to minimize the downward protrusion of the central mechanism. However, it is intended to provide a central mechanism of a tire vulcanizer capable of accommodating a cylinder device in a place frame during transportation.

[0007]

In order to solve the above-mentioned problems, a central mechanism of a tire vulcanizer of the present invention comprises a bladder above a tubular body which slides a vertical guide portion provided on a press frame. In a central mechanism of a tire vulcanizer in which a hub having a lower portion held therein is fixed and a center post holding an upper portion of a bladder is slid through a center hole of the hub, a rod is provided between the hub and the center post. Is provided upward, and a hole through which a rod of the cylinder device passes is opened around the guide portion.

[0008]

When the rod of the cylinder device is shortened, the center post moves up with respect to the hub, and when the rod extends, the center post moves down. Since the center post and the cylinder device are arranged in parallel, when raising and lowering the hub, it is sufficient to raise and lower the entire cylinder device and the center post, and there is nothing protruding below the center post. The rod of the cylinder device can be shortened and the center post can be housed in the press frame in a raised state.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a central mechanism of a tire vulcanizer of the present invention, and FIG. 2 is a cross-sectional view showing how a bladder assembly is attached to the central mechanism.

In FIG. 1, 34 is a press frame, 5
2 is a lower mold attachment member, 2 is a center mechanism, 3 is a center post, and 4 is a hub.

The hub 4 has a flange 4b, and a cylindrical body 4c is projected downward from the flange 4b. A hole 34a is formed on the upper side of the press frame 34.
A guide member 30 is attached so as to straddle a.
The cylindrical body 4c is slidably guided in the upper and lower holes 30a of the guide member 30. Therefore, the cylindrical body 4c has a length that does not come off the upper and lower holes 30a within the stroke range of the lever 33 by the cylinder device 36 described below.

The center post 3 is slidably provided in the center hole 4a of the hub 4 and has a flange 31e at its lower end. Two hydraulic cylinders 31, 31 are fixed to the lower ends of the cylinder bodies on both sides of the flange 31e, and the end fittings 31b of the rods 31a of the hydraulic cylinders 31, 31 are fixed.
Are fixed to the flange 4b of the hub 4 via a heat insulating plate 31c.

That is, since the rod 31a of the hydraulic cylinders 31, 31 penetrates the guide member 30 of the press frame 34, the flange portion 3 around the guide member 30.
A through hole 30b opens at 0a.

Further, the pin 32 is provided in the middle of the center post 3.
Is projected laterally, and the tip of the lever 33 is attached to the pin 32.
Is engaged with. Lever 33 is pin 35 on frame 34
Is pivotally supported by a hydraulic cylinder 36 and lever 33
Swings at an angle α. That is, when the lever 33 swings, the center post 3 and the hub 4 integrally move up and down. A cylinder device may be used instead of the lever 33.

Next, the lifting operation of the above-mentioned central mechanism will be described. FIG. 1 shows a rod 31a of the hydraulic cylinder 31, 31.
Shows the case where it is most extended, and the center post 3 is at the lower limit position with respect to the hub 4. Further, the lever 33 is also swung downward, and the center post 3 and the hub 4 as a set are at the lower limit position. Therefore, the pit 37 may have a depth that does not interfere in the illustrated state. The center post 3 and the hydraulic cylinders 31, 31 are arranged in parallel,
Moreover, the rod 31a extends to above the press frame 34 (near the upper mold mounting member 52), and the downward protrusion of the central mechanism is minimized. Further, the cylinder bodies of the hydraulic cylinders 31, 31 are on the lower side, and are separated from the upper mold mounting member 52 of the heating source, and the rod 31a.
The amount of heat that can be transmitted through is limited.

When the rods 31a of the hydraulic cylinders 31, 31 are shortened, the flange 31e and the cylinder body rise, and the center post 3 projects upward from the hub 4.
When the hydraulic cylinders 31, 31 are in the most shortened state, the flange 31e is located above the lower surface 34c of the press frame 34 and is in the housed state.

Further, when the lever 33 is swung upward by the hydraulic cylinder 36, the center post 3 and the hub 4 become a set and further rise. After all, the hydraulic cylinders 31, 31
With the hydraulic cylinder 36, the center post 3 and the hub 4 are located at their own heights, and the bladder (not shown) can be inflated at a desired position.

Next, the attachment state of the bladder assembly to the above-mentioned central mechanism will be described with reference to FIG. In FIG. 2, 1 is a lower mold, 2 is a central mechanism located at the center of the lower mold 1, 3 is a center post of the central mechanism 2, and 4 is a central mechanism 2.
Is the hub of.

The bladder assembly 10 comprises a bladder 11, which is a rubber bag, sandwiched between a top ring 12 and a bottom ring 13 from above and below. Center hole 13a of the bottom ring 13
Fits into the hub 4 and is in contact with the step portion of the hub 4 at the flange portion 13b. The bead ring 13c of the bottom ring 13 is fitted to the lower mold 1. The top ring 12 has a conical hole 12a at the center, and the conical hole 12a is engaged with the conical shaft 3a at the upper end of the center post 3 to be positioned.

At the upper ends of the top ring 12 and the center post 3, a chuck 21 that can be opened and closed is provided.
A lock device 22 is provided between the bottom ring 13 and the hub so as to be engageable and disengageable.
The bladder assembly 10 is positioned and fixed at a predetermined position of the central mechanism 2 by and. The chuck 21 is a collet chuck, and has a nose 21a and a claw 21 that can be opened and closed.
It consists of b and. The claw 21b is connected to the rod 24, and is biased by a spring 26 in a direction to pull in the nose 21a. By extending the cylinder 28, the nose 21a is extended.
Can be opened.

Further, in order to carry the bladder assembly 10 to a position directly above the central mechanism 2 and carry it to the mounting position shown in the drawing, the carrying device can be accessed. This carrying device includes an openable upper clamp 51 that holds a ring groove 12b of a top ring 12, and a bead ring 13 of a bottom ring 13.
An openable and closable lower clamp 52 for gripping c, an arm 53 on which the upper and lower clamps 51, 52 are provided in a projecting manner, and an arm 53 that can move forward and backward with respect to the central mechanism 2 and can move up and down with respect to the central mechanism 2. It is provided with an advancing / retreating means 54.

The bladder assembly 11 is attached to the upper and lower clamps 5 outside the machine.
When it is gripped by 1, 52, advances and retreats means 54 moves forward just above the central mechanism 2, and further descends toward the central mechanism 2,
It will be at the mounting position as shown by automatic transportation. At this time, the chuck 21 is open and the lock device 22 is in the open position. Then, when the chuck 21 is closed and the lock device 22 is in the lock position, the bladder assembly 11 is automatically attached to the central mechanism 2. The removal and unloading of the bladder assembly 11 are automatically performed in the reverse order of the above.

The central mechanism 2 to which the bladder assembly 10 is attached controls the bladder 11 at a desired height and at a desired interval to inflate the bladder in the green tire T as shown in FIG. it can.

[0024]

The center mechanism of the present invention has a cylinder device arranged in parallel with the center post so that the downward protruding length thereof is minimized. Therefore, when installing the tire vulcanizer, the pit can be made shallow, and the foundation work can be performed. The cost can be reduced. Further, since the central mechanism can be housed in the press frame in a state where the cylinder device is shortened, transportation etc. are facilitated without preparing a special mount.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a central mechanism of a tire vulcanizer of the present invention.

FIG. 2 is a cross-sectional view showing how the bladder assembly is attached to the central mechanism.

FIG. 3 is a sectional view of a central mechanism of a conventional tire vulcanizer.

[Explanation of symbols]

 2 center mechanism 3 center post 4 hub 4a center hole 4b flange 4c cylindrical body 10 bladder assembly 11 bladder 12 top ring 13 bottom ring 30 guide portion 30b through hole 31 cylinder device 31a rod 31e flange

Claims (1)

[Claims] 1. A hub for holding a lower portion of a bladder is fixedly provided on an upper side of a cylindrical body that slides on a vertical guide portion provided on a press frame, and a center post for holding an upper portion of the bladder is formed in a center hole of the hub. In the central mechanism of the tire vulcanizer configured to slide, a cylinder device having a rod facing upward is provided between the hub and the center post, and a hole through which the rod of the cylinder device passes is provided around the guide portion. The central mechanism of the tire vulcanizer, which is opened.