JPS5948747B2 - Tire body sealing method and sealing device in vehicle tire vulcanization - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a vulcanization process in a mold during the manufacture of various vehicle tires and a vulcanization process for vulcanizing a camel bag and adhering it to a tire casing when regenerating used tires. , relates to a method and apparatus for sealing a tire body.

By the way, the tire diameter value is generally the outer circumferential surface of a green tire or a vulcanized tire casing! This is done by inserting a tire body to be vulcanized, which has been temporarily joined together with a rough joint, into a split mold, and heating the tire body while applying pressure to the inner surface of the tire body.

Conventionally, a rubber bag (usually called an air bag or bladder) shaped to fit the inner surface of the tire body is inserted into the tire body, and high-temperature fluid is pressurized into it. The tire body was heated while being inflated and pressurized from the inside by the inflation pressure, but this vulcanization method
) Since pressurization and heating are performed via a rubber bag, the heating efficiency is poor; (2) the rubber bag needs to be replaced every 200 to 300 tires; (3) Until the bag reaches a predetermined temperature and pressure, its shape is not stable, which may cause irregular friction on the inner surface of the green tire and deform the tire. There were other drawbacks.

Therefore, in recent years, the tire body to be vulcanized is inserted into the split mold.
A method has been proposed in which vulcanization is performed by forming a sealed space and applying high-temperature, high-pressure fluid directly to the inner surface of the tire body.

However, in the case of this vulcanization method, in order to prevent leakage of the high-temperature, high-pressure fluid that is press-fitted into the split mold, including the tire body, the joint between the tire body bead edge and the corresponding split mold member surface must be It is necessary to securely crimp the

During vulcanization, the crimping tool for crimping the bead edge of the tire body to the surface of the split mold member moves to a position where it can crimp the bead edge. Under normal conditions, the crimping tool removes the vulcanized tire.
The structure must be smaller than the bead edge opening diameter of the tire body so that a new tire to be vulcanized can be inserted, and it must be made of a material that can sufficiently withstand the high temperature of 160°C to 200°C, which is the vulcanization temperature. It needed to be done.

This invention was made in view of the above-mentioned points, and when vulcanizing the inner surface of the tire body by directly applying high-temperature and high-pressure fluid, the tire body bead edge is pressed against the surface of the split mold member, and the inner surface of the tire body is vulcanized. The present invention aims to provide a tire body sealing force method and device that forms a completely sealed space containing a tire body, has a simple structure, and is convenient to handle.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 5, reference numeral 1 denotes a pair of opposing split molds, and the following split mold members 2 to 4, namely, a pair of opposing mold bases 2, and a full-size half-cut tread molds 3 fixed oppositely to each other on the peripheral parts;
Furthermore, each mold base plate 2 includes a bead plate 4 disposed at the center of the front surface thereof facing each other so as to be movable back and forth.

Note that the half-cut tread mold 3 is not only a full size for green tires but also a half size for recycled tires (not shown).
There is.

The opposing mold bases 2 are moved toward or away from each other by a cylinder device (not shown), and each bead plate 4 is moved back and forth with respect to the mold base 2 by another cylinder device 5.

Reference numeral 6 denotes a donut-shaped variable diameter ring body formed by connecting a large number of continuous circular coil spring element rings 7 in an annular manner, and its outer diameter is normally slightly smaller than the opening diameter of the bead edge B of the tire body A. , its thickness is slightly larger than the distance between the bead edges B in the tire body A, and this ring body 6 serves as a force for the bead plate 4 except during vulcanization. It is movably arranged around the tool 8.

In addition, on the front surface of the lower bead plate 4 facing the holder 8, a variable diameter ring 6 is expanded in diameter in the radial direction around the holder 8 when the split mold is closed. A guide member 9 that is pushed out and held in that position is provided protrudingly,
This guide member 9 consists of a truncated cone having a central hole 10 with an open upper end, and the holder 8 can be fitted into the central hole 10 when the split mold is closed.

Furthermore, injection holes 11 and 12 for high-temperature and high-pressure fluid are installed in the lower mold base 2 and bead plate 4, respectively, when the split mold is closed.
A high temperature, high pressure fluid source (not shown) is connected to the injection hole 11, which extends through the injection hole 11 in a continuous manner.

Next, the mode of operation of the above embodiment will be explained.

Upper and lower bead edges B of a cylindrical green tire A
is attached between the peripheries of the upper and lower bead plates 4, which face each other at a predetermined distance, and by operating the cylinder device to gradually narrow the distance between the bead plates 4, 4, the green tire A. The bead edges B and B approach each other to form a normal tire shape, and at the same time, the guide member 9 also approaches the holder 8 and its tip fits into the variable diameter ring body 6, so that the variable diameter ring The body 6 moves toward the area between the bead edges B and B within the tire body A while being expanded in diameter along the inclined surface of the guide member 9 (see FIG. 2).

When the variable diameter ring 6 moves to the tire bead edge B at the peripheral edge of the bead plate 4, the opposing upper and lower bead plates 4 come into contact with the variable diameter ring 6 (see FIG. 8).

Then, when another cylinder device is operated to bring the separated mold base 2 and half-cut tread mold 3 closer together until they are joined together, the upper and lower bead plates 4
. The tire bead edges B, B are pressed against the peripheral edges of the bead plates 4, 4 by the drag force (see FIG. 4).

In this state, if high-temperature, high-pressure fluid is injected into the split mold 1 through the injection holes 11, 12, the high-temperature, high-pressure fluid acts on the inner surface of the tire body A, thereby vulcanizing the tire.

Note that when the tire vulcanization is completed, the variable diameter ring body 6 is reduced in diameter and placed in the holder 8 in the opposite manner to the above, so that the tire can be replaced with a new tire.

6 to 8 show other embodiments of the variable diameter annular body.
The variable diameter ring body 6 in the figure is constructed by connecting a large number of spring element rings 7 whose inner members are gradually enlarged in the radial direction when viewed from above, connected in an annular manner by a long coil spring 7' with a smaller diameter. Each spring element ring 7 is securely crimped onto the bent portion.

Further, the ring body 6 in FIG. 7 is a front and rear circular spring element ring 7.
Accordingly, the ring body 6 in FIG. 8 is formed by a pentagonal spring element ring 7.

Furthermore, in FIG. 9, instead of providing the holder 8 of the variable diameter ring 6 on the front surface of the upper bead plate 4, it is arranged so as to be movable up and down in the center hole 10 of the lower guide member 9 and compressed. Another embodiment of the holder 8 connected via a spring 8' and integrally provided on the guide member 9 side is shown.

Next, FIGS. 10 to 14 show other embodiments of the device,
In this case, instead of the variable diameter ring body 6 shown in FIG. 5, two variable diameter ring bodies 16, 16, which are thinner than the variable diameter ring body 6, are provided protruding from the front surfaces of the upper and lower bead plates 14 and 14, respectively, facing each other. It is movably arranged in the annular holder 18.18, and when the split mold is closed, the upper and lower two variable diameter rings 16,1
A guide member 19 is provided on the lower variable-diameter ring body 16 so as to be movable up and down.

This guide member 19 is a top and bottom holder 18 when closing the split mold.
．． It consists of a disc body having an annular cavity 20 into which the number 18 can be inserted.

The mode of operation of this embodiment, as shown in FIGS. 10 to 13, is substantially the same as that of the above embodiment, so the explanation will be omitted. Make sure that the springs do not enter into the gaps between the spring rings 17.

As explained above, according to the tire body sealing force method and sealing device of the present invention, the tire body bead edge is reliably pressed against the corresponding split mold member surface, and the tire body including the inside is completely sealed. Because a sealed space can be formed, when vulcanizing a tire by applying high-temperature, high-pressure fluid directly to the inner surface of the tire body, the high-temperature, high-pressure fluid in the split mold is particularly effective against the bead edges of the tire body and the bead plate. In addition to fully demonstrating the unique effects of the above-mentioned vulcanization method, such as high heating efficiency and economical performance, there is no risk of water infiltration, and the device has a simple structure, is convenient to handle, and improves work efficiency. Furthermore, since a highly heat-resistant spring element ring is used in the crimping tool that is directly affected by high-temperature fluid, it has the advantage of being able to be used stably over a long period of time without having to be replaced.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the device of the present invention, in which FIG. 1 is an overall central longitudinal sectional view, FIGS. 2 to 4 are partial longitudinal sectional views, and FIG. 5 is a variable diameter FIG. 6 is a perspective view of the ring;
Figures to Figures 8 show other embodiments of the variable diameter ring body, Figure 6 is a plan view and longitudinal sectional view in the normal state and expanded diameter state, Figures 7 and 8 are partial longitudinal sectional views, and Figure 9 is a partial longitudinal sectional view. The figure is a partial longitudinal sectional view showing another embodiment of the holder. Figures 10 to 14 show a second embodiment of the device;
FIG. 0 is an overall central longitudinal sectional view, FIGS. 11 to 13 are partial longitudinal sectional views, and FIG. 14 is a perspective view of the guide member. 1.11...Split mold, 2,12...Mold base, 3.13...Half-cut tread mold, 4,
14...Bead plate, 5,15...
・Cylinder device, 6゜16...Variable diameter ring, 7
, 17... spring elemental ring, 8, 18...
... Holder, 9, 19... Guide member, 10.
...Central hole, lL12, 2L22 ... Injection hole, 20 ... Annular cavity, A ... Nitire body (green tire), B ......・Bead edges.

Claims (1)

[Scope of Claims] 1. A tire body to be vulcanized is inserted into a pair of split molds to form a sealed space containing the tire body, and a high-temperature, high-pressure fluid is directly applied to the space to form a tire body. In the case where vulcanization is planned, a variable diameter ring formed by connecting a large number of spring rings is placed inside the bead edge of the tire body, and when the split mold is closed, it is extruded onto the bead edge of the tire body. A method for sealing a tire body in vulcanization of a tire for a vehicle, characterized in that the bead edge of the tire body is pressed against the surface of a split mold member using the deformation resistance of the spring element ring. 2. Insert the tire to be vulcanized into a pair of split molds to form a closed space containing the inside of the tire body, and apply high-temperature, high-pressure fluid directly to the space to perform the intended vulcanization of the tire body. In the device, a holder is provided protruding from at least one of the split mold members, a variable diameter ring formed by connecting a large number of spring rings is movably disposed on the holder, and when the split mold member is closed, A sealing device for a tire body in vulcanization of a tire for a vehicle, characterized in that a guide member is provided for pushing out a variable diameter ring to a bead edge within the tire body and holding it in that position.