JPH0124609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a method for vulcanizing tire bodies during the vulcanization process during the manufacture of tires for various vehicles and during the vulcanization process for curing camel bags and adhering them to tire casings during the retreading of used tires. It relates to a device for sealing.

By the way, when vulcanizing tires, generally the outer circumferential surface of a green tire or a vulcanized tire casing is coated with
This is done by inserting a tire body to be vulcanized, which is made by temporarily joining camel bags together, 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 injected into the bag to inflate it. , while pressurizing the tire body from the inside with the inflation pressure,
However, this vulcanization method is: (1) Pressure and heating are performed through the rubber bag, which is indirect, and the heating effect is poor; (2) The rubber bag is 300
- Replacement is required every 400 tires, which is uneconomical; (3) the shape of the bag is not stable until it reaches a specified temperature and pressure; There were drawbacks such as the risk of tire deformation due to friction with regulations.

Therefore, in recent years, a method has been proposed in which the tire body to be vulcanized is inserted into a split mold to form a sealed space, and vulcanization is performed by directly applying high-temperature, high-pressure fluid 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. It must have a structure that is smaller than the bead edge opening diameter of the tire body so that a vulcanized tire can be inserted, and it must be made of a material that can sufficiently withstand the high vulcanization temperature of 160℃ to 200℃. The need arose.

In order to meet such demands, the inventor of the present application extruded a variable diameter ring formed by connecting a large number of spring rings to the bead edge inside the tire when closing the split mold, and the deformation resistance of the spring rings causes He invented a method and device for sealing a tire body in which the bead edge of the tire body is pressed against the surface of a split mold member, and has already applied for a patent (Japanese Patent Application No. 55-169992). This invention is an improvement on the invention, and when vulcanizing the inner surface of the tire body by directly applying high-temperature, high-pressure fluid, the bead edge of the tire body is securely pressed against the surface of the split mold member, and the high-temperature, high-pressure fluid is It is an object of the present invention to provide a tire body sealing device that can completely prevent leakage.

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 peripheral portions within each mold base 2. It consists of full-sized half-cut tread molds 3 which are fixed to face each other, and bead plates 4 which are arranged facing each other so as to be movable back and forth at the center of the front surface of each mold base 2.

In addition to the full size for green tires, the half-cut tread mold 3 is available in a half-size (not shown) for recycled tires, and there is also a half-cut mold that is divided in the circumferential direction.

The opposing mold bases 2 are moved closer to each other or separated from each other by a cylinder device (not shown),
Further, each bead plate 4 is moved back and forth relative to the mold base 2 by another cylinder device 5.
6 is a pair of upper and lower springs 8 that hold down a large number of holding members 7.
Each presser member 7 has a tire body bead edge presser portion 7a having a shape corresponding to the tire body bead edge contact portion of the peripheral edge of the bead plate 4 on the outside. The tapered guide portions 7b of the spring 8 are formed in the inner side, and are formed symmetrically with respect to the upper and lower sides, with a fitting portion 7c for a holder 9 (to be described later) in the center, and a seat 7d of the spring 8 in the fitting portion 7c. It consists of a plate-like body whose thickness gradually increases from the inside to the outside.

The outer diameter of the presser member connection body 6 is normally slightly smaller than the opening diameter of the bead edge B of the tire body A.
Reference numeral 9 denotes a disc-shaped holder, which connects a pair of discs 9a at a predetermined distance and integrally by a connector 9b, and the fitting part 7c of the presser member 7 is fitted into the outer surface of at least one of the discs 9a. A large number of fitting grooves 9c are provided radially, and a headed bolt 1 is inserted into this holder 9.
0 loosely, and the holder 9 and bead plate 4
A spring 11 is interposed therebetween, and the bead plate 4 is attached to one of the bead plates 4 so as to be able to move toward and away from it.

Moreover, each presser member 7 of the presser member connection body 6
are fitted into each fitting groove 9c of the holder 9 so as to be slidable in the radial direction.

Then, the opposing surfaces of the upper and lower bead plates 4 each have a tapered surface 12' corresponding to the tapered guide portion 7b of each presser member 7 fitted to the holder 9,
Guide members 12 are respectively provided to protrude and expand the diameter of the presser member connection body 6 in the radial direction when the split mold is closed, and push it out onto the bead edge B portion within the tire body A and hold it at that position. Furthermore, a series of injection holes 13 for injecting high-temperature, high-pressure fluid for tire vulcanization into the split mold 1 are formed in the lower mold base 2 and bead plate 4, and the injection holes 13 are Connect to a high pressure fluid source (not shown).

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

The upper and lower bead edges B of a green tire A formed in a cylindrical shape are attached between the peripheral edges of upper and lower bead plates 4 that face each other at a predetermined interval, and the distance between the bead plates 4 is adjusted from both sides by operating the cylinder device 5. As the green tire A is gradually pinched, the upper and lower bead edges B of the green tire A approach each other to form a normal tire shape, and at the same time, the tapered surfaces 12' of the upper and lower guide members 12 align with each taper guide of the presser member connection body 6. In contact with the portion 7b, the connecting body 6 is pushed out into the tire body A while being expanded in diameter radially. (See Fig. 2) Then, by operating another cylinder device, the mold base 2 and half-cut tread mold 3, which are separated, are brought closer to each other so that they come into contact with each bead plate 4, and then brought closer together until they are joined. Along with this, the upper and lower bead plates 4 also approach each other, so each presser member 7 is further pushed outward by the guide member 12 of the bead plate 4, and each presser member 7 presses the tire body bead edge. Part 7b is tire body bead edge B
The upper and lower bead plates 4 are sandwiched together with the peripheral edges of the upper and lower bead plates 4 that face each other. (See Figures 3 and 4) In this way, with the tire body A sealed inside the split mold 1, if high-temperature, high-pressure fluid is injected into the split mold 1 from the injection hole 13, the tire body A high-temperature, high-pressure fluid acts on the inner surface of A to vulcanize the tire.

In addition, when the tire vulcanization is completed, each presser member 7 is returned to its original state by the spring 8 and its diameter is reduced by the operation mode opposite to that described above.
Can be replaced with another tire. Figure 6 shows
Another embodiment of the presser member 7 is shown in which a high-temperature, high-pressure fluid passage groove 7e is provided at the center of both sides of its outer end.

Further, FIG. 7 shows a third embodiment of the presser member 7, in which a spring seat 7d of the presser member 7 is formed in the inner center part so as to be fitable between the upper and lower disks 9a of the holder 9, and one They are connected by a spring 8 so that each holding member 7 can move more smoothly in the radial direction.

FIG. 8 shows a fourth embodiment of the presser member 7, in which the upper and lower tire body bead edge pressers 7a are formed separately from the main body of the presser member 7, and are attached to the main body so as to be slidable only in the vertical direction. , a leaf spring 7f is interposed between the upper and lower bead holding parts 7a to bias it in the opposite direction, thereby ensuring the pressure bonding of the bead edge holding part 7a to the tire body bead edge B, and one type of holding member 7. This makes it possible to use the tire body A of a plurality of sizes with different distances between the bead edges B of the tire body A.

Figures 9a and 9b and 10a and 10b show that when the bead edge presser portions 7a of each presser member press the bead edge B of the tire body, the gap between adjacent presser portions 7a is made as small as possible or the gap is 9a and 9b, the presser member 7 has a structure in which the
is a fan-shaped presser plate 7'a on the upper and lower presser parts 7a every other
It is attached so that it can move up and down freely and is biased in the relative direction by a spring, and when crimping the bead edge B of the tire body,
Adjacent presser portions 7a and presser plates 7'a are arranged in series, and in the presser member 7 shown in Figs. 10a and 10b, the upper and lower presser portions 7a can be joined alternately with adjacent side surfaces. Each presser member 7 is formed into a trapezoidal cross-section and is normally positioned upward.
The fitting part 7c is formed with a gap provided to the disk fitting groove 9c, and when the tire body bead edge B is crimped, the upper presser member 7 descends and the presser parts 7a of each presser member are connected. ing.

Furthermore, FIG. 11 shows another embodiment of this device,
The upper guide member 12 is formed separately from the guide plate 4, and the base end of the headed bolt 10 loosely inserted into the holder 9 is screwed onto the guide member 12, and the guide member 12 and the holder are connected together. A spring 11 is interposed between the guide members 12 and 9 to separate the guide member 12 from the presser member connector 6 normally disposed on the holder 9.
Moreover, it is attached above the holder 9 so as to be able to come in and out.

Note that the mode of operation of this device is substantially the same as that of the embodiment described above, so a description thereof will be omitted.

FIG. 12 shows protrusions 7b' and 1 at the end of contact between the tapered guide part 7b of the presser member 7 and the tapered surface 12' of the guide member 12, respectively, in opposing directions.
2'' is shown, in which each presser member 7 pushed out into the tire body A by the approach of the bead plate 4 is further pushed outward by the contact between both projections 7b and 12'', and then slightly When the bead edge pressing part 7a is pressed against the tire bead edge B, the pressed state is reliably maintained.

Further, the upper guide member 12 is formed separately from the bead plate 4 similarly to the device shown in FIG. While loosely inserting into the shaped holder 9, the holder 9 and the guide member 1
A spring 11 is interposed between the two so that the two can be moved toward and away from each other. At a position of the guide member 12 opposite to the bolt 10, a fitting hole 1 for the bolt 10 is provided.
0' is bored out.

As explained above, the tire body sealing device of the present invention guides a large number of tire body bead edge pressing members disposed on a holder by a guide member when closing a split mold to extrude them all at once into the tire body. Since the body bead edge is crimped to the corresponding split mold member surface to form a sealed space containing the inside of the tire body, the movement of the presser member in the radial direction by the guide member is reliable, and the tire body is When vulcanizing a tire by directly applying high-temperature, high-pressure fluid to the inner surface, it is possible to completely prevent leakage of high-temperature, high-pressure fluid from between the tire bead edge and the split mold member surface. It has the same effects as the earlier invention, namely, it has a simple structure, is convenient to handle, has high working efficiency, and is highly durable, so it can be used stably for a long period of time.

[Brief explanation of drawings]

1 to 5 show an embodiment of the device of the present invention, in which FIG. 1 is an overall center longitudinal sectional view, FIGS. 2 and 3 are partially enlarged longitudinal sectional views, and FIG. 4 is a partial longitudinal sectional view. FIG. 5 is a perspective view and a plan view of the presser member 7,
FIG. 6 is a perspective view showing a second embodiment of the presser member 7;
FIG. 7 is a perspective view showing a third embodiment of the presser member 7;
FIG. 8 is a perspective view showing a fourth embodiment of the presser member 7;
FIG. 9a is a plan view showing a fifth embodiment of the presser member 7 and a part of the connecting body 6, and FIG.
10a is a vertical sectional view of the holding part 7a in the normal state showing the sixth embodiment of the holding member 7 and a part of the connecting body 6, and FIG. FIG. 11 is a longitudinal sectional view of the entire center showing another embodiment of the device of the present invention, and FIG. 12 is a longitudinal sectional view of the presser member 7 and the guide member 1.
FIG. 3 is a partially enlarged vertical cross-sectional view showing another embodiment such as No. 3; DESCRIPTION OF SYMBOLS 1...Split mold, 2...Mold base, 3...Half-cut tread mold, 4...Bead plate, 5...Cylinder device, 6...Press member connection body, 7...Press member, 7a... ...Tire body bead edge presser, 7'a...
...Press plate, 7b...Taper guide portion, 7b'...Protrusion, 7c...Fitting portion, 7d...Spring seat, 7e...Through groove, 7f...Plate spring, 8...Spring, 9 ...Holder, 9a...Disc, 9b...
Connector, 9c... Fitting groove, 10... Bolt, 1
0'...Bolt insertion hole, 11...Spring, 1
2...Guide member, 12'...Tapered surface, 1
2″...protrusion, 13...injection hole, A...tire body, B...bead edge.

Claims (1)

[Claims] 1. Insert the tire body to be vulcanized into a pair of split molds to form a sealed space containing 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 disc-shaped holder is attached to at least one split mold member so as to be able to freely approach and separate via a spring, and a tire body bead edge presser is attached to the outer side and an outwardly expanding taper guide part is attached to the inner side. A large number of presser members formed in the same shape are connected in an annular manner by a spring, and the presser member connected body is fitted into the holder, and when the split mold is closed, the presser member comes into contact with the guiding part of the presser member and is inserted into the tire. 1. A tire body sealing device for vulcanizing a tire for a vehicle, characterized in that guide members for pushing out all at once are disposed above and below a presser member connection body so as to sandwich the guide members.