JP2002160247A - Method for manufacturing belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a belt having no air bubbles therein, capable of performing molding as sufficiently as possible. SOLUTION: A long tubular winding body 5 is arranged to the outside of a vulcanizing rubber cylinder 4 positioned outside the molding body 2 provided on the mold 2. By supplying a heating pressure fluid to the long tubular winding body 5 from one end thereof when the molding body 2 is heated and pressed, the heating pressure fluid is expanded to press the vulcanizing rubber cylinder 4 to provide a time lag at the time of molding. The escape time of residual air is ensured by the time lag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a belt, and more particularly to a method for producing a belt smoothly without being hindered by air remaining in a mold groove or the like.

[0002]

2. Description of the Related Art Conventionally, for example, a toothed belt 31 shown in FIG. 13 has been manufactured as follows. First, a mold provided with belt tooth grooves in the vertical direction outside the cylindrical shape (FIG. 1)
(See FIG. 2), a tubular tooth cloth is put on the core, a core wire is wound thereon, and a rubber sheet is further wound thereon.
Prepare Next, the molded body is heated and pressurized with steam through a heat-resistant rubber cylinder and molded. Then, a molded product having a mold length is cut into a predetermined belt width or cut into a standard product width.

[0003] This production method has the advantage that it is suitable for mass production, and in most cases can be produced successfully.

However, when molding, air in the groove space of the mold teeth, air in the space between the core wires, air interposed between the rubber sheets, and the like cannot escape, so that the belt teeth move along the grooves of the mold. There has been a problem that sometimes accurate molding is not sufficiently performed, which sometimes occurs.

Further, for example, a cord flat belt 32 shown in FIG.
Was manufactured as follows. First, a rubber sheet is put on a cylindrical mold, a core wire is wound thereon, and a rubber sheet is further wound thereon to prepare a molded body. In some cases, the mold may be covered with a tubular canvas first, and may be further covered with a tubular canvas last. This molded body is molded by heating and pressing through a heat-resistant rubber cylinder, and after molding, a molded product having a mold length is cut into a predetermined belt width or a standard product width.

However, there is a problem that air in the space between the core wires and air interposed between the rubber sheets cannot escape at the time of molding, and air is sometimes included in the belt. .

Further, for example, a V-ribbed belt shown in FIG.
33 was manufactured as follows. First, a cylindrical cloth is put on a cylindrical mold, an adhesive rubber sheet is put on the cylindrical cloth, a core wire is wound on the cloth, a rib rubber sheet is further wound on the adhesive rubber sheet, and a molded article is prepared. This molded body is molded by heating and pressing with steam through a rubber cylinder having heat resistance. After molding, the sheet is cut to a predetermined rib width, and then polished through a step of forming a V-rib. In some cases, after molding, after a step of forming a V-rib, it is cut to a predetermined number of ribs and polished.

However, when molding, air in the space between the cords and air interposed between the rubber sheets cannot escape and become air bubbles, and sometimes these air bubbles are present in the V rib layer and the adhesive rubber layer. There was a problem that it occurred.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of manufacturing a belt which is molded as sufficiently as possible and has no bubbles.

[0010]

In order to solve the above-mentioned problems, the present invention employs the following technical means. In the belt manufacturing method of the present invention, a long tubular wound body is disposed outside a vulcanizing rubber cylinder located outside a molded body provided on a mold, and when the molded body is heated and pressed, By supplying the heating and pressurizing fluid from one end side of the tubular wound body, the heating and pressurizing fluid expands and presses the rubber cylinder for vulcanization, thereby giving a time difference at the time of molding. Is characterized by securing time to escape.

In this belt manufacturing method, when the molded body is heated and pressurized, a heated and pressurized fluid is supplied from one end side of the tubular wound body (the outer peripheral shape of the cross section is not necessarily circular). Since the heating and pressurizing fluid expands and presses the rubber cylinder for vulcanization, there is a time difference at the time of molding, and the time difference ensures the time for residual air to escape. The air in the space, the air in the space between the cords, and the air between the rubber sheet layers are gradually pushed out of the space. Conventionally, it was not always extruded.

In the case of a toothed belt, for example, a molded body is a combination of a mold covered with a cylindrical tooth cloth, a core wire wound thereon, and a rubber sheet wound thereon. A combination of a rubber sheet wound around a mold, a core wire, and a rubber sheet further wound (in some cases, the mold may be first covered with a cylindrical cloth, and may be finally covered with a cylindrical cloth. In the case of a V-ribbed belt, it refers to a combination body in which a mold is covered with a cylindrical cloth, followed by winding an adhesive rubber sheet, then a core wire, and further winding an adhesive rubber sheet and a ribbed rubber sheet. By disposing a long tubular wound body inside the mold and supplying a heating pressurized fluid from one end side of the tubular wound body, heating from the inside of the mold also has a time difference during molding. The time for the residual air to escape may be secured by the time difference.

[0013] Heating from the inside of the mold is usually intended to sufficiently perform vulcanization, but with such a configuration, the time from the inside of the mold during heating is also set to make the residual air suitable for heating from the inside of the mold. Can be kicked out.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIGS. 1 to 6, the method of manufacturing the belt is based on a method of manufacturing the belt teeth 1 on the outside of a vulcanizing rubber cylinder 4 located outside a molding 3 provided on a mold 2 for molding. , A long tubular wound body 5 is disposed. As the tubular wound body 5, a tube made of heat-resistant rubber was used.

When the molded body 3 is heated and pressurized, a heated and pressurized fluid is supplied from one end of the tubular wound body 5 so that the heated and pressurized fluid expands and the vulcanizing rubber cylinder is expanded. The pressing has a time difference during molding, and the time difference secures time for the residual air to escape.

For this purpose, first, a molded article 3 was prepared by covering the mold 2 with a cylindrical tooth cloth 6, subsequently winding a cord 7, and further winding a rubber sheet 8.

Then, a vulcanizing apparatus 9 in which the above-mentioned molded bodies 3 are combined is disposed in a vulcanizing can (not shown). Above the vulcanizer 9, an inlet and an outlet 10 for heated and pressurized steam are provided. The heat-resistant tube 5 is spirally wound outside the rubber cylinder 4 and inside the vulcanizing device 9, and its final end, that is, the lower end is closed. In addition, below the vulcanizing device 9, a valve without drain is arranged.

When the vulcanizing can is filled with steam, the outside of the vulcanizing device 9 is filled with steam, but the inside of the vulcanizing device 9 flows through the steam inlet and the outlet 10. The steam that has flowed into the heat-resistant tube 5 through the inlet 10 of the vulcanizing device 9 reaches the lower end of the tube and fills a tube path that is spirally wound upward from the lower end. I will do it.

The inlet and outlet 10 of the steam supplied to the heat-resistant tube 5 seal the space between the vulcanizer 9 and the outlet. With this seal, the heated and pressurized steam does not enter the inside of the vulcanizing apparatus 9 and the outside of the heat-resistant rubber tube 5, and can be sufficiently filled while expanding to the upper part of the rubber cylinder 4.

Below the rubber cylinder 4, there is attached a slide portion 12 which moves in the direction when the cylinder is pressed. The slide section 12 is stored in the storage section 13.

Next, a method of manufacturing the belt of this embodiment will be described.

As shown in FIG. 5, when the steam is supplied to the heat-resistant tube 5, the steam that has reached the lower part expands sequentially, and the rubber sheet 8 of the molded body 3 starts to be pressed into the mold groove. The air between the outside of the rubber sheet 8 and the inside of the rubber cylinder 4 is sequentially pushed out to another space through a gap between the upper part of the mold 2 and the projection 14 of the vulcanizing device 9.

Further, as shown in FIG.
As the steam is filled, the molded body 3 is heated and pressurized with a time lag from the lower part to the upper part. In addition,
Due to the expansion of the lower portion of the heating tube 5, the rubber cylinder 4 is sufficiently heated and pressurized, and the slide portion 12 connected to the rubber cylinder 4 moves inward.

When the tooth cloth 6 and the rubber sheet 8 are sufficiently filled in the mold groove 1, steam is introduced into the mold to vulcanize the belt teeth, thereby completing the molding vulcanization. After completion, the steam in the mold 2 and the steam in the vulcanizing device 9 are discharged.

As described above, the steam is introduced into the heat-resistant tube 5 to press the heat-resistant rubber cylinder 4 to be molded. However, since a time lag occurs before the molding is completed, the air existing in the space between the tooth grooves of the molded body is formed. The air in the space between the core wires, the air in the rubber sheet layer, and the like are gradually pushed out from the space, and the molding is performed as sufficiently as possible so that no air bubbles are contained.

The inlet and outlet for steam may be provided in the lower part of the vulcanizer (not shown). In this way, heating and pressing are performed with a time lag from the upper part to the lower part, the tooth cloth and the rubber sheet can be sufficiently filled in the mold groove, and the optimum shape is selected according to the equipment situation. be able to. (Embodiment 2) As shown in FIG. 7 and FIG.
Are provided in two places above and below. Upper and lower heat resistant tubes 5
Are closed near the center.

Heating and pressurization of the molded body 3 by the heat resistant tube 5 can be performed simultaneously in both the upper direction and the lower direction of the vulcanizing device 9, so that the molding can be performed efficiently. The heating and pressurizing are also performed with a time lag, and the molding is performed as sufficiently as possible so that no bubbles are present. (Embodiment 3) In this embodiment, the vulcanizing device 9 itself is a vulcanized can. In the first embodiment, the vulcanizing device 9 in which the molded body 3 is combined is provided in the vulcanizing can.

As shown in FIG. 9, the inlet and outlet of steam
10 was fitted with a valve 16 for controlling the inflow and outflow of steam.

The outside of the vulcanizing device 9 is in a normal pressure environment. By supplying heated and pressurized steam to the heat-resistant rubber tube 5, the air between the outside of the rubber sheet 8 and the inside of the rubber tube 4 is removed. Discharged through outlet 17.

In this method, too, the air in the space of the tooth space of the molded body, the air in the space between the core wires, the air between the rubber sheet layers, and the like are gradually pushed out of the space, and the molding is performed as sufficiently as possible. This can be done to keep bubbles out. (Embodiment 4) As shown in FIGS.
, A long tubular wound body 5, that is, a heat-resistant tube, is attached to a projection 20 connected to the steam inlet and outlet 19 of the lower end plate 18, and spirally wound along the inside of the mold 2. . A metal tube may be used as the heat-resistant tube 5. The end of the heat-resistant tube 5 is open and is heated backward from the steam inlet. In order to support the heat-resistant tube 5 from the inside, a cylindrical body 21 and a disk-shaped reinforcing plate 22 are provided.

Steam is supplied to the outer heat-resistant tube 5 as shown in FIG. 11, and as shown in FIG.
Is completed. Next, when steam is supplied to the inner heat-resistant tube 5, the heating by the inner heat-resistant tube 5 is performed from the inlet toward the rear.

In this embodiment, there is also a time difference when the mold 2 is heated from the inside. That is, there is a time difference in the heating from the inside, so that the air in each part of the molded body is gradually pushed out from the groove.

In the above embodiments, since the air in each space is continuously pushed out and moved, the movement of the flowing rubber and the belt cloth on the front surface thereof are not hindered and are provided outside the mold. The groove space is more than sufficiently filled, and molding defects due to residual air are eliminated.

Further, since steam flows into and out of the heat-resistant and pressure-resistant tube 5, the steam does not come into direct contact with the molded body 3, and steam leakage to the molded portion occurs from outside the mold and from inside the mold. In addition, there is no generation of product defects due to steam leakage. Therefore, industrial waste is no longer produced, and valuable earth resources can be used effectively.

The outside and inside of the vulcanizing device 9 may be covered with a heat insulating material (not shown). Glass wool whose outside is covered with a thin metal film can be used as the heat insulating material. With this configuration, heat leakage to the outside of the vulcanizing apparatus can be suppressed by the heat insulating material, and heat inside the vulcanizing apparatus, which becomes high during molding, can be used efficiently.

[0036]

The present invention is configured as described above and has the following effects.

Since the air in the space of the molded body is gradually extruded from the space, it is possible to provide a method for producing a belt in which the molding is performed as sufficiently as possible and no bubbles are present.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a mold.

FIG. 2 is a perspective view showing the structure of a molded body.

FIG. 3 is a perspective view of a vulcanizing apparatus for explaining a belt manufacturing method according to a first embodiment of the present invention.

FIG. 4 is a sectional view of a state before steam is supplied by the vulcanizing apparatus of FIG. 3;

FIG. 5 is a sectional view showing a state in which steam is being supplied by the vulcanizing apparatus of FIG. 3;

FIG. 6 is a sectional view of a state in which steam is supplied by the vulcanizing apparatus of FIG. 3;

FIG. 7 is a perspective view of a vulcanizing apparatus for explaining a belt manufacturing method according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a state before steam is supplied by the vulcanizing apparatus of FIG. 7;

FIG. 9 is a perspective view of a vulcanizing apparatus for explaining a belt manufacturing method according to a third embodiment of the present invention.

FIG. 10 is a sectional view of a state before steam is supplied by the vulcanizing apparatus of FIG. 9;

11 is a cross-sectional view of a state in which steam is being supplied to the outer tubular wound body by the vulcanizing apparatus of FIG. 9;

FIG. 12 is a cross-sectional view of a state in which steam is supplied to the outer tubular wound body by the vulcanizing apparatus of FIG. 9;

FIG. 13 is an enlarged perspective view of a main part showing the structure of the toothed belt.

FIG. 14 is an enlarged perspective view of a main part showing a structure of a cord flat belt.

FIG. 15 is an enlarged perspective view of a main part showing a structure of a V-ribbed belt.

[Explanation of symbols]

 2 mold 3 molded body 4 rubber cylinder for vulcanization 5 tubular wound body

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Claims (2)

[Claims] 1. An elongated tubular wound body is provided outside a vulcanizing rubber cylinder located outside a molded body provided on a mold, and the tubular wound body is heated and pressurized when the molded body is heated and pressurized. By supplying a heated and pressurized fluid from one end of the body,
A method for producing a belt, characterized in that the heating and pressurizing fluid expands and presses a rubber cylinder for vulcanization with a time difference at the time of molding, and the time difference secures time for residual air to escape. 2. An elongated tubular wound body is provided inside a mold, and a heating and pressurizing fluid is supplied from one end side of the tubular wound body, so that heating from inside the mold can be performed during molding. 2. The method according to claim 1, wherein a time difference is provided, and the time difference secures time for the residual air to escape.