JPH0445338B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire holding rim device used for holding a tire in a post cure inflator or the like.

The tire vulcanizer is equipped with a post-cure inflator that inflates the vulcanized tire using air pressure and air-cools it. Conventionally, the rim for holding the tire of this post-cure inflator is a rim divided into upper and lower parts, and the rim parts are moved up and down to engage the tire. However, in order to withstand the internal pressure, a strong support frame was required, which increased the weight of the device, and because the device was mounted top to bottom, it was difficult to properly engage the tires. Furthermore, when the dimensions of the tire change, replacing the rim is time-consuming and inconvenient.

This invention was made for the purpose of solving the above problem, and the outer circumference of the rim on which the tire engages is divided along the axial direction into large rim pieces with a wide outer circumference and a narrow inner width. The large rim pieces and the small rim pieces are arranged alternately and slidably in close contact with each other. The small rim piece is supported so that it can be moved in the radial direction, and the small rim piece is retractable inside the outer peripheral surface of the large rim piece, and when both rim pieces are extended outward, the large rim piece and the small rim piece are separated. The outer circumferential surfaces of the two are on the same large-diameter circumference, and when the small rim piece is retracted, a relatively small-diameter circumference is formed only by the outer circumferential surface of the large rim piece. The large rim piece and the small rim piece are connected via a link to a moving body provided in the core, and both rim pieces are moved in the radial direction by the forward and backward movement of the moving body. .

Embodiments shown in the drawings will be described below. FIGS. 1 and 2 are a side view and a sectional view showing an example of a rim device according to the present invention, and this rim device 1 includes a rim body 2 and a rim body 2. It consists of a drive device 3. The rim body 2 is divided along the axial direction and formed as an assembly of large rim pieces 4, 4, . . . and small rim pieces 5, 5, . The large rim piece 4 is formed into a fan shape with a wide outer diameter part and a narrow inner width, and the small rim piece 5 is formed into a wedge shape in cross section with a narrow outer diameter part and a wide inner width. Both of these rim pieces 4,
5 are arranged alternately along the circumferential direction, and their dividing surfaces inclined with respect to the radial direction are slidably in close contact with each other.

A sealing material 7 is embedded in the sliding surface 5a of the small rim piece 5, as shown in FIG. Illustrated example (first
In Figure), the sealing material 7 has a two-layer structure consisting of a surface layer 7a made of silicone resin and an elastic layer 7b made of rubber material buried below the surface layer 7a. It may be made of only wood. As the rubber material, for example, urethane rubber, acrylonitrile rubber, silicone rubber, etc. can be used. As the sealing material 7, in order to improve the airtightness of the sliding portion between the small rim piece 5 and the large rim piece 4, it is preferable to use an elastic material that is somewhat resistant to crushing. Additionally, in order to ensure smooth sliding, it is desirable to select a material that has self-lubricating properties. In addition to the above materials, nylon, urethane foam, etc. may also be used. If the sealing material 7 is made of rubber, it can be successfully fixed to the small rim piece 5 by baking, or if it is made of resin, it can be firmly fixed to the small rim piece 5 by adhesive.
If the sealing material 7 is made of a material such as hard urethane, it can also be screwed to the small rim piece 5. Note that it is preferable that the sealing material 7 is fixed in a recessed portion 5b provided in the small rim piece 5 as shown in the illustrated example. In the illustrated example, the sealing material 7 is fixed to the small rim piece 5 side, but it may also be provided on the large rim piece 4 side. In some cases, the sealing material 7 may not be provided.

Flanges 9, 9' are provided on both sides of the rim body 2.
is provided. Bar-shaped sliding guides 10 are embedded radially in the surface of one side of the rim of the flanges 9, 9' at a ratio of one pair for each rim piece, and these guides slide into grooves 11 provided in the large rim piece 5. They are fitted together so that they can move freely. Each rim piece 4, 5 is connected to the sliding guide 10.
It moves in the radial direction using the fitting between the groove 11 and the groove 11 as a guide. The sliding guide 10 may be formed as a convex strip integral with the flanges 9, 9'.

The drive device 3 includes a support shaft 16 fixed to a frame 15, an air cylinder device 17, and a moving body 1.
It has 9. The air cylinder device 17 includes a fixed piston body 20 fitted to the support shaft 16.
It consists of a movable cylinder 21, and the cylinder 21 is configured to slide back and forth by compressed air that is selectively supplied from two ventilation holes 22 and 23 communicating with the front and rear of the piston body 20. cylinder 2
A mounting flange 24 integrally provided in the front part of 1
is connected to the movable body 19 by a connecting rod 25 passing through the flange 9', so that when the cylinder 21 moves on the support shaft 16, the movable body 19 slides on the support shaft together with the cylinder 21. It is configured. Rim pieces 4 and 5 are provided on the outer periphery of the movable body 19.
There are protrusions 27, 27' corresponding to the number of links 28, 28', and the front protrusion 27 has a large rim piece 4, and the rear protrusion 27' has a small rim piece 5 with links 28, 28', respectively. connected via. The links 28, 28' are pivotally connected to the rim pieces 4, 5 and the movable body 19, and by moving the movable body 19, the rim pieces 4, 5 can be moved in a direction perpendicular to the center axis of the rim. can.

When using this rim device 1, firstly, when air is supplied to the vent hole 23 of the air cylinder device 17 and the cylinder 21 is moved backward, the movable body 19 moves back together, so that the rim pieces 4 and 5 are linked together. 2
8, 28' to the inside (center axis side)
The outer diameter of the rim is reduced as shown in FIG. In this state, the outer peripheral surface of the rim is composed only of the large rim piece 4. Next, the tire 30 is fitted onto the rim whose diameter has been reduced in this way, and when air is supplied from the vent hole 22 on the opposite side of the air cylinder device 17 to move the cylinder 21 forward, the rim pieces 4 and 5 are removed. The outer diameter of the rim is expanded by moving in the direction of
The engagement between the bead portion 30a of the tire 30 and the rim outer circumferential portion becomes strong, and the tire 30 is attached to the rim body 2.
It is held tightly. When the rim diameter is expanded to the maximum, the outer circumferential surface of the small rim piece 5 and the outer circumferential surface of the large rim piece 4 are located on the same circumference. in this way,
Once the tire 30 is held on this rim device 1, air is supplied from the inside of the rim through the holes provided in the rim piece to inflate the tire, and this device is used for necessary processing, such as post-cure inflator. If necessary, apply air cooling treatment.

Since this rim device 1 does not require separation of the rim during use, positional displacement does not occur and the engagement of the tires is good. Since the entire rim device is integrally formed, the entire device is compact. It is structurally simple as it does not require a lifting cylinder or the like like the conventional upper and lower split rim.

As explained above, in the tire holding rim device according to the present invention, the rim body is formed by a combination of large rim pieces and small rim pieces, and the diameter of the rim is expanded or contracted by moving these pieces in the radial direction. Because of this structure, the structure is simple and the tire can be held in the air tact, which is excellent in practical use. It goes without saying that the rim device according to the present invention can be used for applications other than post-cure inflators, such as a uniformity machine, a bulge inspection machine, and a buffing machine.

[Brief explanation of drawings]

Figure 1 is a side view of the rim body, Figure 2 is a front sectional view of the rim device, Figure 3 is a view of the rim piece in the direction of arrow A, and Figure 4 is a side view of the rim body.
The figure is an explanatory diagram of the diameter-reduced state, and FIG. 5 is a sectional view showing the tire mounted state. All figures represent examples. 1... Rim device, 2... Rim body, 3... Drive device, 4... Large rim piece, 5... Small rim piece, 7...
Seal material, 9, 9'...flange, 10...sliding guide, 11...groove, 16...support shaft, 17...
Air cylinder device, 19... moving body, 21... cylinder, 25... connecting rod, 28, 28'... link, 30... tire.

Claims (1)

[Scope of Claims] 1 The outer periphery of a drum-shaped rim is divided along the axial direction to create a large rim piece whose outer periphery is wide and whose inner width is narrow, and a large rim piece whose outer periphery is narrow and whose inner width is narrow. The large rim pieces and the small rim pieces are arranged alternately and slidably in close contact with each other, and both of the rim pieces are movable in the radial direction, and By supporting the rim piece so that it can be retracted inside the outer periphery of the large rim piece, when both rim pieces are extended outward, the outer circumferential surfaces of both the large and small rim pieces have the same large diameter circumference. When both rim pieces are retracted, a small-diameter circumference is formed only by the outer peripheral surface of the large rim piece. A rim device for holding a tire, characterized in that the rim device is connected via a link so that the back and forth movement of the movable body and the radial movement of both rim pieces are linked. 2. The tire holding rim device according to claim 1, wherein a sealing material for preventing air leakage is arranged on the sliding portion of the small rim piece and the large rim piece.