JPH0880534A - Vulcanizing press device for endless belt - Google Patents

Abstract

PURPOSE: To provide a vulcanizing press device for endless belt wherein unvulcanized rubber of an endless belt does not enter gaps of outer molds. CONSTITUTION: When an outer mold 1 is moved inward in the radial direction, mold plates 10 positioned at both ends of the outer mold 1 in the peripheral direction butt against the mold plates 10 of other outer mold 1, respectively. Thus, each mold plate 10 butts against each other and moves inward in the peripheral direction of a back plate 20 against a spring 13. At this time, each gap S gradually narrows with the movements of the mold plates 10 and closes at the same time that the outer mold 1 entirely closes, so that the gaps among the mold plates 10 are extremely small immediately before the mold plates 10 are attached with pressure to an endless belt A and an unvulcanized rubber of the endless belt A does not enter the gaps of the mold plates 10 when the mold plates 10 are attached with pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vulcanizing press device for an endless belt for producing an endless belt used as a crawler belt for agricultural machines and snow vehicles.

[0002]

2. Description of the Related Art Conventionally, when manufacturing an endless belt of this type, a vulcanizing press device described in, for example, Japanese Patent Application Laid-Open No. 2-74310 is used. This device comprises a cylindrical outer mold for molding the outer peripheral surface of the endless belt, and a circular inner mold for molding the inner peripheral surface of the endless belt,
An unvulcanized endless belt is loaded between the outer mold and the inner mold, and the outer mold is radially contracted to pressurize the endless belt. In this case, the outer mold is divided into about 6 in the circumferential direction, and the inner diameter of the outer mold is expanded and contracted by moving these divided portions in the radial direction of the outer mold.

[0003]

However, in the conventional vulcanizing press device, when the diameter of the outer mold is increased when the endless belt is loaded, the divided parts are separated from each other to form a gap in the circumferential direction, and the endless belt is When pressurizing, the diameter of the outer mold is reduced while the gaps between the divided parts are closed. Therefore, during pressurization, the unvulcanized rubber of the endless belt enters the gap of the outer mold and is vulcanized as it is, which requires a troublesome work of removing it from the vulcanized endless belt. I was there. Also, if rubber enters the gap of the outer mold, the thickness of that portion becomes thin, and the rubber that enters the gap does not completely seal the outer mold, resulting in uneven thickness of the endless belt in the circumferential direction. There were also problems.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vulcanizing press device for an endless belt in which the unvulcanized rubber of the endless belt does not enter the gap of the outer mold. To provide.

[0005]

In order to achieve the above object, the present invention comprises, in claim 1, an outer mold which is divided into a plurality of pieces in the circumferential direction, and an inner mold corresponding to the outer mold. By moving inward in the radial direction,
In a vulcanizing press device for an endless belt, which presses an endless belt loaded between an outer mold and an inner mold with a mold plate attached to an inner peripheral surface of the outer mold, a plurality of the mold plates are arranged in a circumferential direction of the outer mold. Each mold plate is movably attached in the circumferential direction of the outer mold, and each mold plate is urged to form a predetermined gap in the circumferential direction when the outer mold moves radially outward. ing.

According to a second aspect of the invention, in the vulcanizing press device for an endless belt according to the first aspect, one of the facing surfaces of the outer mold and each mold plate has a projection, and the other has the projection. Engaging holes to be fitted are provided respectively, and a biasing means for biasing the mold plate in the circumferential direction is provided between the protrusion and one end of the engaging hole.

According to a third aspect of the present invention, in the vulcanizing press device for an endless belt according to the first or second aspect, engaging pieces protruding laterally of the mold plate are provided on both side surfaces of each of the mold plates in the width direction. , Grooves on which the engaging pieces of each mold plate are slidably engaged are provided at corresponding portions on both sides of the outer mold in the width direction, and at least one groove is formed by a member detachably attached to the outer mold. There is.

[0008]

According to the vulcanizing press device for an endless belt of claim 1, when the outer mold is moved inward in the radial direction, the mold plates located at both circumferential ends of the outer mold become the mold plates of other outer molds. Abut. As a result, the mold plates come into contact with each other and move inward in the circumferential direction of the outer mold. At that time, each gap gradually narrows as each mold plate moves, and the outer mold is completely closed and closed at the same time. It becomes extremely small, and the unvulcanized rubber of the endless belt does not enter the gap between the mold plates when the mold plates are pressure-bonded.

Further, according to the vulcanizing press device for an endless belt of claim 2, in addition to the function of claim 1, the protrusion provided on one of the outer mold and each mold plate is engaged with the engaging hole provided on the other. The mold plates are urged in the circumferential direction by the urging means provided between the protrusion and the one end of the engaging hole, so that the mold plates reliably operate.

Further, according to the vulcanizing press device for an endless belt of claim 3, in addition to the action of claim 1 or 2, the engaging pieces provided on both side surfaces of each mold plate in the width direction correspond to the outer mold. The mold plates are securely supported by the outer mold by engaging with the grooves provided in the outer mold, and the mold plates can be replaced by removing at least one of the members forming the groove from the outer mold.

[0011]

1 to 10 show one embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a vulcanizing press device for an endless belt, FIG. 2 is a side sectional view of an outer mold, and FIG. FIG. 4 is a front view seen from the inside, and FIG. 4 is a cross-sectional view taken along line XX of FIG.

This vulcanizing press device is provided with an outer mold 1 divided into six circumferential directions and an inner mold 2 also divided into six circumferential directions. These molds 1 and 2 are not shown. It is designed to move in the radial direction by a drive mechanism. That is, as shown in FIG. 1 (a), by moving the outer mold 1 outward in the radial direction, the inner peripheral surface of the outer mold 1 is enlarged, and every other inner mold 2 is moved alternately inward in the radial direction. As a result, the outer peripheral surface of the inner mold 2 is reduced.

In this apparatus, the endless belt A is hung on the outer periphery of the reduced inner mold 2, and the inner mold 2 is moved radially outward to tension the endless belt A in the circumferential direction. By moving 1 inward in the radial direction, the endless belt A is pressed as shown in FIG. 1 (b).

The structure up to this point is the same as the conventional structure, and the outer mold 1 which characterizes the present invention will be described below.
That is, as shown in FIGS. 2 to 4, the outer mold 1 includes a total of four mold plates 10 divided in the circumferential direction, and a back plate 2 that movably supports each mold plate 10 in the circumferential direction.
And 0 and are fixed to a drive mechanism (not shown) via the back plate 20.

Each mold plate 10 is curved along the outer mold 1, and a mold (not shown) having a predetermined shape corresponding to the surface pattern of the endless belt to be molded is formed on the inner surface thereof. Engaging pieces 11 for engaging the back plate 20 are provided on both side surfaces in the width direction of each mold plate 10,
Each engagement piece 11 projects laterally of the mold plate 10 and is formed continuously in the circumferential direction. Engagement holes 12 for engaging with the back plate 20 are provided at two positions in the width direction on the outer surface of each mold plate 10, and springs 13 are oriented in the circumferential direction of the mold plate 10 in each engagement hole 12. Installed.

Similar to each mold plate 10, the back plate 20 is curved to fit the outer mold 1, and is formed on the inner surface side thereof so as to support the mold plates 10 side by side in the circumferential direction. A guide wall 21 and guide blocks 22 having a shape corresponding to the guide wall 21 are provided on both sides in the width direction on the inner surface of the back plate 20, and the guide wall 21 is formed integrally with the back plate 20. Also, the guide block 2
2 is detachably attached to the back plate 20 with bolts 23. A groove 21a extending in the circumferential direction of the back plate 20 is provided on the inner side surface of the guide wall 21, and one widthwise engaging piece 11 of each mold plate 10 is slidably engaged with the groove 21a. Has become. Further, the guide block 22 has a groove 22a similar to the guide wall 21 formed between the guide block 22 and the back plate 20 in a state of being attached to the back plate 20, and each mold plate 1 is formed in the groove 22a.
The other engagement piece 11 in the width direction of 0 is slidably engaged. On the other hand, on the inner surface of the back plate 20, projections 24 for locking the respective mold plates 10 are provided at a total of four locations in the circumferential direction, and each projection 24 is provided at two locations in the width direction. ing.

In the above configuration, each mold plate 10
The engaging pieces 11 at both ends into the grooves 21 of the back plate 20.
By being engaged with a and 22a, they are movably supported in the circumferential direction of the back plate 20, respectively. Further, the protrusions 23 of the back plate 20 are engaged with the engagement holes 12 of the mold plates 10, and the spring 13 is interposed between one end of the engagement hole 12 and the protrusion 24 in a compressed state. ing. In this case, each of the mold plates 10 is urged toward the outer side in the circumferential direction by a total of two on one end side and the other end side of the back plate 20 in mutually opposite directions. As a result, when the outer mold 1 is moved outward in the radial direction as shown in FIG.
Moves until the other end of the engaging hole 12 is locked to the protrusion 24, and the gaps S are equally spaced between the mold plates 10.
Is formed.

Here, when the outer mold 1 is moved inward in the radial direction when the endless belt A is vulcanized, the mold plates 10 located at both ends in the circumferential direction of the outer mold 1 as shown in FIG.
Respectively contact the mold plates 10 of the other outer molds 1. As a result, the mold plates 10 come into contact with each other and move inward in the circumferential direction of the back plate 20 against the spring 13, as indicated by the solid arrow in the figure. At this time, the gaps S shown in FIG. 2 gradually narrow as the mold plates 10 move, and the outer mold 1 is completely closed and closed at the same time. The gap S between the mold plates 10 becomes very small just before the mold plate 10 is crimped to A. When the mold plates 10 are crimped, the unvulcanized rubber of the endless belt A is the gap S between the mold plates 10.
It doesn't get in.

Next, the mounting structure of each mold plate 10 will be described with reference to FIGS. 6 to 10. That is, FIG.
(a) is a plan sectional view showing the engaging holes of the mold plate (the vertical direction in the figure corresponds to the circumferential direction of the outer mold), FIG. 6 (b) is a side sectional view thereof, and FIG. 7 shows the mold plate from the back plate. It is a front view which shows the separated state.

As shown in FIG. 6 (a), the engaging hole 12 has a first hole portion 12a extending in the width direction and a second hole portion 12b formed in the lower end side of the first hole portion 12a and extending in the width direction. And a third hole 12c extending downward from the center of the second hole 12b in the width direction.
And the first hole 12a has a step and the second hole 1
It is formed shallower than 2b. The second hole 12b is formed such that one end in the width direction is longer than the first hole 12a, and the second hole 12b is also longer in the up-down direction than the first hole 12a. Also, the third
In the hole 12c, the spring 13 has one end on the second hole 1
The second end of the spring 13 is fixed to the end of the third hole 12c.

When the mold plate 10 is attached to the back plate 20, as shown in FIG. 7, after engaging the engaging piece 11 on one side in the width direction of the mold plate 10 with the groove 21a of the back plate 20, the guide block 22 is attached. By fastening the bolts 23 to the back plate 20, the other engaging piece 11 of the mold plate 10 is constrained by the guide block 22, and the mold plate 10 is movably supported by the back plate 20.

A method of engaging the projection 24 of the back plate 20 with the engaging hole 12 of the mold plate 10 at the time of mounting will be described with reference to FIGS. 8 to 10. In each drawing, (a) is a plan sectional view of the engagement hole, and (b) is a side sectional view thereof.

First, the mold plate 10 is pressed against the back plate 20 as shown in FIG.
It is inserted into the first hole portion 12a. At that time, the first hole 12a
Since the mold plate 10 is shallowly formed, the mold plate 10 is slightly lifted from the back plate 20. next,
The mold plate 10 is displaced upward in the drawing (in the circumferential direction of the back plate 20) so that the protrusion 24 is formed in the first hole portion 12a of the engaging hole 12.
When it is moved from the second hole portion 12b to the second hole portion 12b, the protrusion 24 is moved to the second hole portion 12 due to the step between the first hole portion 12a and the second hole portion 12b.
It goes deeply into b and the mold plate 10 is the back plate 2
Touches 0 completely. At that time, the spring 13 is compressed as the protrusion 24 moves, and
It is accommodated in the hole 12b so as to be vertically movable, and the size of the gap S is determined by the amount of movement of the protrusion 24.
After that, the mold plate 10 is moved to the left side (back plate 2
When the projection 24 is moved to the end of the second hole portion 12b by shifting in the (0 width direction), one of the engagement pieces 1 of the mold plate 10 is moved.
1 enters the groove 21a of the back plate 20 (see FIG. 7), and then the guide block 22 may be attached to the other engaging piece 11 side as described above.

As described above, according to the vulcanizing press apparatus of the present embodiment, the mold plate 10 of the outer mold 1 is divided into four pieces in total in the circumferential direction and biased by the spring 13 so as to form the gap S with each other. When the outer mold 1 is moved inward in the radial direction, the mold plates 10 are brought into contact with each other to close the gap S. Therefore, when the mold plates 10 are pressed against the endless belt A during pressurization, The gap S between the plates 10 becomes extremely small, and it is possible to reliably prevent the unvulcanized rubber of the endless belt A from entering the gap S between the mold plates 10 when the mold plates 10 are pressure-bonded. Therefore, it is possible to completely seal the outer mold without requiring the troublesome work of removing the rubber that has entered between the outer molds as in the conventional case, so that the thickness of the endless belt can be always made uniform. . In addition, one of the engaging pieces 11 of each mold plate 10 is connected to the groove 21 of the back plate 20.
After engaging with a, the guide block 22 is attached to the back plate 20 to restrain the other engaging piece 11, so that each mold plate 10 can be easily attached to and detached from the back plate 20. In this case, since each mold plate 10 is divided and the weight of each mold plate is lightened, the replacement work of each mold plate 10 can be performed very easily in combination with the above-mentioned simple mounting structure. be able to.

In the above embodiment, a total of six outer molds 1 are used.
The mold plate 10 is divided into a total of four, but this is an example, and the number of outer molds 1 and the number of mold plates 10 divided are not limited to those in the above embodiment. Further, the back plate 20 is provided with a guide wall 21 having an integral structure on one side and a detachable guide block 22 on the other side. Both of them are detachably provided, and only one of them is detached when the mold plate 10 is replaced. You may do it.

[0026]

As described above, according to the vulcanizing press device for an endless belt of the first aspect, the unvulcanized rubber of the endless belt does not enter into the gap of the outer mold, so that the conventional vulcanizing rubber is not used. Since the outer mold can be completely sealed without the troublesome work of removing the rubber entering between the molds, the thickness of the endless belt can be always made uniform.

According to the vulcanizing press device for an endless belt of claim 2, in addition to the effect of claim 1, each mold plate can be reliably operated, which is advantageous for realizing a specific device. is there.

According to the vulcanizing press device for an endless belt of claim 3, in addition to the effect of claim 1 or 2, since each mold plate can be reliably supported by the outer mold, a specific device Is advantageous for realization of. Also, since each mold plate can be easily attached to and detached from the outer mold,
The replacement work of each mold plate can be performed extremely easily.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vulcanizing press device for an endless belt showing an embodiment of the present invention.

FIG. 2 is a side sectional view of an outer mold.

FIG. 3 is a front view seen from the inside of the outer mold.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is an operation explanatory diagram of each mold plate.

FIG. 6 is a plan sectional view and a side sectional view showing engagement holes of a mold plate.

FIG. 7 is a front view showing a state where the mold plate is separated from the back plate.

FIG. 8 is a plan sectional view and a side sectional view showing a method of engaging a protrusion and an engaging hole.

9A and 9B are a plan sectional view and a side sectional view showing an engaging method of a protrusion and an engaging hole.

FIG. 10 is a plan sectional view and a side sectional view showing a method of engaging a protrusion and an engaging hole.

[Explanation of symbols]

1 ... Outer mold, 2 ... Outer mold, 10 ... Mold plate,
11 ... Engaging piece, 12 ... Engaging hole, 13 ... Spring, 20
... back plate, 21a ... groove, 22 ... guide block, 22a ... groove, 24 ... projection, A ... endless belt.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B29K 105: 24 B29L 29:00

Claims (3)

[Claims] 1. An outer mold divided into a plurality of pieces in the circumferential direction,
A mold plate having an inner mold corresponding to the outer mold, and by moving the outer mold inward in the radial direction, an endless belt loaded between the outer mold and the inner mold is attached to the inner peripheral surface of the outer mold. In a vulcanizing press device for an endless belt that applies pressure with, the mold plate is divided into a plurality of pieces in the circumferential direction of the outer mold, and each mold plate is movably attached in the circumferential direction of the outer mold. A vulcanizing press device for an endless belt, characterized in that they are urged so as to form a predetermined gap in the circumferential direction when they move outward in the radial direction. 2. A projection is provided on one of the facing surfaces of the outer mold and each mold plate, and an engagement hole with which the projection is engaged is provided on the other surface, and between the projection and one end of the engagement hole. 2. A vulcanizing press device for an endless belt according to claim 1, wherein said urging means is provided for urging the mold plate in the circumferential direction. 3. Engaging pieces protruding laterally of the mold plate are provided on both side surfaces of each mold plate in the width direction, and engaging pieces of each mold plate slide on corresponding portions on both sides of the outer mold in the width direction. The vulcanizing press device for an endless belt according to claim 1 or 2, wherein a groove that is movably engaged is provided, and at least one groove is formed by a member that is detachably attached to the outer mold.