JP2002160227A - Method for producing belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a belt which is molded sufficiently and contains no bubbles. SOLUTION: An elastic bag 4 is arranged on the outside of a rubber cylinder 3 for vulcanization located on the outside of a molding 2 formed on a mold 1, and a shielding cylinder 5 is arranged forward/backward movably between the rubber cylinder 3 and the bag 4. When the molding 2 is heated and pressed, by moving the shielding cylinder 5, the bag 4 supplied with a heated, pressurized fluid is expanded to press the rubber cylinder 3, and a time lag for pressing is generated during molding. By the time lag, a time for residual air to escape is secured.

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. 9 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.

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, a predetermined number of ribs may be cut after a step of forming a V-rib.

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.

[0011] In the belt manufacturing method according to the present invention, an elastic bag-like body is provided outside a vulcanizing rubber cylinder located outside a molded body provided on a mold, and the vulcanizing rubber cylinder and an elastic bag-like body are provided. An elastic bag-shaped body to which a heating and pressurizing fluid is supplied expands and is heated by pressurizing the molded body by heating / pressing the molded body by moving a shielding cylinder between the bag and the bag. It is characterized in that there is a time difference at the time of molding with respect to pressing the rubber cylinder for vulcanization, and the time difference secures time for the residual air to escape.

In the belt manufacturing method, when the molded body provided on the mold is heated and pressurized, the shielding bag is moved so that the elastic bag-shaped body supplied with the heated and pressurized fluid expands and is vulcanized. Since the time difference at the time of molding is given to press the rubber cylinder, for example, air in the space between the tooth grooves, air in the space between the core wires, air between the rubber sheet layers, etc. , Is gradually pushed out of the space. Conventionally, it was not always extruded.

Here, the above-mentioned molded body means, for example, a combination body in which a mold is covered with a cylindrical tooth cloth in a toothed belt, a core wire is wound thereon, and a rubber sheet is further wound. 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.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 6, in this embodiment, an outer side of a vulcanizing rubber cylinder 3 located outside a molded body 2 (see FIG. 2) provided on a mold 1 (see FIG. 1). An elastic bag-shaped member 4 is disposed at the same time, and a rigid shielding tube 5 is interposed between the vulcanizing rubber tube 3 and the elastic bag-shaped member 4 so as to be able to advance and retreat. A heat-resistant rubber bag was used as the elastic bag-like body 4.

When the molded body 2 is heated and pressurized, the shielding bag 5 is moved to expand the elastic bag-like body 4 (rubber bag) to which the heating and pressurized fluid is supplied, so that the rubber tube for vulcanization is vulcanized. There is a time difference at the time of molding with respect to pressing 3, and the time difference secures time for the residual air to escape.

The heating and pressurization with a time difference was performed using a vulcanizing apparatus 6 having a movable heating and pressurizing shielding tube 5.

At the top of the bell-shaped vulcanizer 6, a part of the movable heating and pressurizing shielding tube 5 can be seen, and below it a steam inlet / outlet 7 is arranged (see FIG. 3). ). The inlet / outlet port 7 is connected to a steam inlet pipe and a steam outlet pipe (not shown), and is provided with a valve 9 for controlling steam inlet / outlet. The valve 9 may be operated manually or may be operated electrically using an electromagnetic valve or the like.

As shown in FIG. 1, a rubber cylinder 3 stopper 11 is provided at the center of the bell from the upper part of the inside of the vulcanizing device 6 so as to have a gap with the end plate 10 of the mold 1 on which the molded body 2 is attached. And concentrically project. The width of the rubber cylinder stopper 11 only needs to be thick enough to withstand the force acting on the rubber cylinder 3 in the molding direction during vulcanization molding.

A sliding portion 12 which moves in accordance with the movement of the rubber cylinder 3 toward the mold is provided at a lower portion inside the vulcanizing device 6.
Is provided. The sliding portion 12 is protected by a fixed portion 13 in both the upper, lower, left and right directions, and the lower end of the movable heating / pressing shielding tube 5 is located above the fixed portion 13.

The slide portion 12 extends along the inner circumference of the vulcanizing device 6 and is divided in a horizontal direction so as to be able to move in the direction of the mold 1 without any trouble. In addition, you may divide | segment with a suitable clearance gap in the up-down direction. The mold 1 side end of the slide portion 12 is fixed to a rubber cylinder. The fixing method may be adhesion or physical fixing with screws or the like. The outer peripheral end of the slide portion 12
It is free.

The inlet / outlet pipe 14 is connected to the heat-resistant and pressure-resistant rubber bag 4 along the inside of the vulcanizing apparatus 6.
Inside the rubber bag 4, a movable heating / pressing shielding tube 5 is located along the outer periphery of the rubber tube 3. The center of the shielding cylinder 5 is located at the same position as the center of the rubber cylinder 3, and the shielding cylinder 5 can operate in the vertical direction while maintaining the center position. There is no particular limitation on the material of the shielding cylinder 5 as long as it meets the pressure resistance and heat resistance.

A rubber cylinder 3 having heat resistance is arranged on the mold 1 side of the shielding cylinder 5, and the inner diameter of the rubber cylinder 3 is set to a size that allows an appropriate space with the molded body. The diameter is set to a size that comes into contact with the shielding cylinder 5. The size is such that the vulcanizer 6 can cover the molded body 2 smoothly, and the rubber bag 4 sufficiently heats and presses the molded body 2 when the rubber bag 4 is filled with the heating and pressurizing steam. Is preferable.

The movement of the shielding cylinder 5 may be performed manually, by a machine, or by computer control. A strong chain may be attached to the hole 15 formed in the shielding cylinder 5 and lifted by a crane as it is.
May be lowered using a force such as hydraulic pressure as a structure that can be lowered downward (not shown). Further, a screw may be cut on the shielding cylinder 5 itself, or a thread may be cut on a rod for transmitting a rotational force to the shielding cylinder 5 to move the shielding cylinder 5 upward or downward while rotating (not shown).

The upper end of the rubber tube 3 is in contact with the upper inside of the vulcanizing device 6, and the lower end of the rubber tube 3 coincides with the lower end of the vulcanizing device 6 and is fixed to the slide portion 12 of the vulcanizing device 6. . Note that the lower end of the rubber cylinder 3 does not need to particularly coincide with the lower end of the vulcanizing device 6.

A hole 16 is formed in the upper part of the inside of the rubber cylinder stopper 11 of the vulcanizing device 6 for communicating the inside and the outside of the vulcanizing device 6. The size of the communication hole 16 may be large enough to move the air that becomes an obstacle during vulcanization. The number of holes 16 may be one or two.

The outside of the vulcanizing device 6 may be covered with a heat insulating material G as shown in FIG. 7, or the inside of the vulcanizing device 6 may be covered with a heat insulating material G as shown in FIG. As the heat insulating material G, glass wool whose outside is covered with a thin metal film or the like can be used. By doing so, heat leakage to the outside of the vulcanizing device 6 is suppressed by the heat insulating material G, and the heat inside the vulcanizing device 6 that becomes high during molding can be efficiently used.

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

As shown in FIG. 4, the molding 2 is covered with a vulcanizing device 6. Initially, holes formed in the upper portion of the vulcanizer 6, between the molded body 2 and the rubber cylinder 3, between the end plate 10 and the rubber cylinder 3, between the end plate 10 and the upper inside of the vulcanizer 6.
16 are mutually connected as communication paths of air.

Then, a heated and pressurized steam introduction pipe (not shown)
When the valve 9 is opened, the steam is filled into the rubber bag 4 in the vulcanizing device 6 through the inlet / outlet pipe 14. Although it is filled, it does not act on the molded body 2 at this stage because it is regulated by the strong shielding cylinder 5.

As shown in FIG. 5, when the shielding cylinder 5 is subsequently moved upward, inflation of the rubber bag 4 starts from below where the effect of the shielding cylinder 5 is lost. Since the heating and pressurization of the molded body 2 is performed from below through the rubber cylinder 3, the air flows to the outside of the vulcanizing device 6 through the communication path.

As shown in FIG. 6, when the shielding cylinder 5 is further raised upward, the rubber bag 4 expands to transmit heat and pressure to the molded body 2 via the rubber cylinder 3, and then heat from the inside of the mold 1. Turn on steam.

After the molding and vulcanization, the valve 9 was released to a discharge pipe (not shown), and the mold 1 was taken out. The slab taken out of the mold 1 did not cause molding failure due to residual air.

In the conventional vulcanizing apparatus, there is no shielding cylinder and rubber bag, and steam directly and simultaneously heats and presses the rubber cylinder. That is, when the valve is opened with respect to the heated and pressurized steam introduction pipe, the steam is filled into the vulcanizing apparatus through the inlet / outlet pipe, and the filled steam uniformly heats and compacts the molded body through the rubber cylinder without time lag. After vulcanization, the valve is released to the discharge pipe and the mold is removed from the vulcanization apparatus. This slab could have a molding failure due to residual air.

However, in this belt manufacturing method, when the molded body 2 provided on the mold 1 is heated and pressurized, the elastic bag-shaped body 4 to which the heated and pressurized fluid is supplied by moving the shielding cylinder 5 is formed. Since it is made to have a time difference at the time of molding with respect to the expansion and pressing of the rubber cylinder 3 for vulcanization, air in the space of the tooth groove portion of the molded body 2, air in the space between the core wires, Air and the like between the rubber sheet layers are gradually pushed out of the space. Therefore, there is an advantage that molding is performed as sufficiently as possible and no bubbles are present.

Further, since the heating and pressurizing of the molded body 2 provided on the mold 1 are performed with a time difference, air in the space between the tooth grooves, air in the space between the core wires, air between the rubber sheet layers, etc. Is extruded from that space, but in the past it was not always extruded.

Further, since the air in each space is continuously pushed out and moves out of the molding space, the movement of the rubber necessary for the molding space and the belt cloth in front thereof is not hindered. The groove space provided in the portion is more than sufficiently filled, and molding defects due to residual air are eliminated.

In such a system in which the heating and pressurizing are performed with a time lag, there is no direct contact between the steam and the compact 2. Therefore, there is also an effect that a product defect due to steam leakage to a molding portion which sometimes occurs in the related art is not generated.

Further, the production of industrial waste is not caused due to the items to be improved, and valuable earth resources can be effectively used.

As described above, in this embodiment, a method of manufacturing a toothed belt that does not contain bubbles in the rubber portion of the belt tooth portion, the rubber portion between the core wires and the back rubber portion, the rubber portion between the core wires and the rubber cover Flat belt not containing air bubbles in the part, and V
It is possible to provide a method for manufacturing a V-ribbed belt that does not include bubbles in the rib portion and the adhesive rubber portion.

Further, a belt with teeth formed precisely by a mold and containing no air bubbles in a rubber portion such as a belt tooth portion, a flat belt having no air bubbles in a rubber portion,
A method for manufacturing a V-ribbed belt can be provided.

[0042]

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 air 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 an embodiment of the belt manufacturing method of the present invention.

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

FIG. 5 is a sectional view of a state in which steam is being injected by the vulcanizing apparatus of FIG. 4;

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

FIG. 7 is a cross-sectional view of a state in which the outside of the vulcanizing apparatus of FIG. 4 is covered with a heat insulating material.

FIG. 8 is a cross-sectional view of a state in which the inside of the vulcanizing apparatus of FIG. 4 is covered with a heat insulating material.

FIG. 9 is an enlarged perspective view of a main part showing the structure of the toothed belt.

FIG. 10 is an enlarged perspective view of a main part showing a structure of a cord flat belt.

FIG. 11 is an enlarged perspective view of a main part showing a structure of a V-ribbed belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Molded body 3 Rubber cylinder for vulcanization 4 Elastic bag-like body 5 Shielding cylinder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 21:00 B29K 21:00 105: 24 105: 24 B29L 29:00 B29L 29:00 F term ( Reference) 4F203 AA45 AG17 DA11 DB11 DC04 DL11 DM08 DM23 DN23 DN26 4F204 AA45 AG17 FA13 FB01 FQ15 FQ37

Claims (1)

[Claims] 1. An elastic bag-like body is provided outside a vulcanizing rubber cylinder located outside a molded body provided on a mold, and between the vulcanizing rubber cylinder and the elastic bag-like body. When the shielding cylinder is interposed so as to be able to advance and retreat, when heating and pressing the molded body,
By moving the shielding cylinder, the elastic bag-shaped body supplied with the heating and pressurizing fluid expands and presses the vulcanizing rubber cylinder, thereby giving a time difference at the time of molding, and a time during which the residual air escapes due to the time difference. A method for producing a belt, characterized in that: