JP3002901B2 - Vulcanization method for power transmission belts and vulcanization equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transmission belt,
The present invention relates to a vulcanizing method and a vulcanizing apparatus which can be applied to a production requiring a vulcanizing step and vulcanize a product to be vulcanized efficiently in a flow operation.

[0002]

[Prior art]

The production of the power transmission belt includes a step of sequentially winding and forming a belt material such as an unvulcanized rubber sheet, a canvas, and a cord (core material) around a mold, and charging the molded mold into a vulcanization container. After that, a step of vulcanizing by heating with steam or the like, a step of taking out the vulcanized mold from the vulcanizing container and cooling,
It is common to cut (slice) the slab into fixed widths through a process of cutting a slab as a vulcanized molded product from a mold.

[0003] Of the above steps, the vulcanization step takes much longer than the other steps (the vulcanization time usually includes
Conventionally, as shown in FIG. 7, a plurality of vulcanization facilities are provided for one molding machine, cooling machine and die-cutting machine.

[0004]

In the above-mentioned conventional vulcanization method, the dies after the molding operation have to be conveyed in parallel to the corresponding vulcanization equipment. Had to be conveyed from a parallel vulcanization facility to a common cooler, and only the vulcanization process had a parallel flow as shown in FIG. In particular, when a plurality of types are manufactured in order, it is necessary to accurately correspond a metal mold to be conveyed to a vulcanizing facility dedicated thereto, so that the conveyance operation becomes considerably complicated. In addition, in order to perform vulcanization efficiently, complicated vulcanization methods such as changing the heating temperature between the outside and the inside of the mold and changing the heating temperature between the preheating stage and the main vulcanization stage have been used. Vulcanization is performed in a pattern, but in such a case, complicated control must be performed for each vulcanization facility.

[0005] The present invention has been made in view of the above points, and by dividing the vulcanizing step which is the most time-consuming in the production of a power transmission belt or the like, the flow of the vulcanizing step is serialized, so-called flow operation is performed. It is an object of the present invention to provide a vulcanization method and a vulcanization facility for manufacturing.

[0006]

According to the present invention, there is provided a vulcanization method comprising the steps of: a) dividing a vulcanization step into a plurality of steps based on a vulcanization pattern or the molding operation time; b) The unvulcanized molded product is sequentially moved together with the vulcanizing vessel between the divided heating / pressurizing means for each step, and vulcanized under each vulcanizing step.

Further, the vulcanization equipment of the present invention for carrying out the above vulcanization method comprises: A) a plurality of heating and pressurizing units corresponding to the number of vulcanization steps divided based on a vulcanization pattern or a molding operation time. Means are installed in series at a predetermined interval, and B) each heating / pressurizing means and the vulcanization vessel are provided with a pair of pressurized high-temperature fluid injection / discharge devices which can be connected and separated from each other. And C) conveying means for sequentially moving the vulcanizing container is provided between the heating and pressurizing means.

[0008]

According to the vulcanizing method and the vulcanizing equipment of the present invention having the above-mentioned structure, for example, in the production of a power transmission belt, a belt material is molded by a mold, and the molded belt is charged into a vulcanizing container. After that, the vulcanization container is sequentially moved between the heating and pressurizing means for each process divided based on the vulcanization pattern or the molding operation time, and the belt molded product in the vulcanization container is subjected to a plurality of vulcanization processes. Vulcanize down. Therefore, for example, when the vulcanization process is divided based on the molding operation time, the molded product is sequentially carried out at the end of the molding operation, loaded into the vulcanization container, and then divided at each molding operation time. The belt molding is vulcanized while being intermittently moved under the vulcanization step. Then, the vulcanized belt molded product is taken out of the vulcanization container and cooled. When the belt material is formed on the mold in the molding step, after cooling, the vulcanized belt molded product is extracted from the mold. According to the vulcanization method of the present invention, by dividing the vulcanization step as described above, the belt moldings involved in each vulcanization step are respectively successively vulcanized in series. For this reason, compared with the conventional parallel vulcanization method, the conveyance of the unvulcanized molded product (vulcanization container or mold) is particularly easy, and the productivity is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vulcanizing method according to the present invention will be described below with reference to the drawings together with an embodiment of a vulcanizing apparatus. The present embodiment relates to a vulcanization facility used for manufacturing a power transmission belt. This vulcanization facility (FIG. 1) divides and vulcanizes four steps based on a vulcanization pattern (FIG. 4). . FIG. 1 is a front view schematically showing a vulcanizing apparatus according to an embodiment of the present invention together with a belt manufacturing process, FIG. 2 is a front view showing a steam injection / discharge device, and FIG. 3 is a schematic view of a vulcanizing can. FIG. 4A is a cross-sectional view, FIG. 4A is a drawing showing two vulcanization patterns from the inside and the outside of the mold, and FIG. 4B is a drawing showing a mode of division of the vulcanization pattern of FIG. is there.

In the molding step shown in FIG. 1, a belt material such as an unvulcanized rubber sheet, canvas, a cord for a core material, etc. is wound around a surface of a mold 1 to form a belt molded product 2. This molding operation is performed using a belt molding machine (not shown), and usually takes about 5 minutes.

After the molding operation is completed, the mold 1 is charged into a vulcanizing can 3 serving as a vulcanizing container, and then the four heating vulcanizing units 5 constituting a vulcanizing equipment 5 for performing the next vulcanizing step. Pressure means 5A-
The first heating and pressurizing means 5A of 5D is placed on a carriage 4 as a conveying means and conveyed.

In the heating and pressurizing means 5A, steam (steam pressure P3) is introduced into the vulcanizing can 3 to form a belt molded product 2 on the surface of the mold 1.
Is preheated from the outside for a certain time (T1) to bring it into a molten state. The vulcanization pattern by the first heating and pressing means 5A is shown in FIG.
This corresponds to the vulcanization pattern (A).

In the same manner as above, the next mold 1 after the molding operation in the molding step is loaded into the vulcanizing can 3 and conveyed to the heating and pressurizing means 5A by the cart 4. At the same time, the first mold 1 preheated by the heating and pressing means 5A is
Is transported by the carriage 4 to the heating and pressurizing means 5B. In the heating and pressurizing means 5B, steam (steam pressure P3) is introduced into the vulcanizing can 3 and steam (steam pressure P1) having a different pressure is introduced into the mold 1 for a certain period of time (T2-T1). The vulcanization pattern by the second heating / pressurizing means 5B corresponds to the vulcanization pattern of FIG. 4B (B).

Hereinafter, as another mold 1 whose molding operation has been completed in the molding step is loaded into the vulcanizing can 3 and is sequentially conveyed to the first heating and pressurizing means 5A by the carriage 4. The mold 1 of the heating and pressing means 5A is connected to the second heating and pressing means 5B,
The mold 1 of the second heating and pressurizing means 5B is substantially equivalent to the third heating and pressurizing means 5C, and the mold 1 of the third heating and pressurizing means 5C is substantially equivalent to the fourth heating and pressurizing means 5D. Conveyed at the same time. In the third heating and pressurizing means 5C and the fourth heating and pressurizing means 5D, steam (steam pressure P3) is kept constant in the vulcanizing can 3 and steam (steam pressure P2) having different pressures is kept in the mold 1. Time (T3-T2) and (T4-T3) are introduced. The vulcanization pattern by the third heating / pressing means 5C is the vulcanization pattern of (C) in FIG. 4B, and the vulcanization pattern by the fourth heating / pressing means 5D is (D) in FIG. ), Respectively.

The vulcanizing can 3 comprises a cylindrical outer mold 3a as shown in FIG. 3, and is provided with a rubber bag 3b which can expand and contract on the inner peripheral side of the outer mold 3a. The outer mold 3a has
A steam injection hole 3c and a discharge hole 3d are formed. Further, the mold 1 is also provided with a steam injection hole 1a and a discharge hole 1b.

Then, the outer mold 3a and the mold 1 of the vulcanizing can 3
2 has a pair of receiving sides 6A (left side in FIG. 2) of the steam injection / discharge device 6 in FIG. 2, and the heating / pressurizing means 5A has an inlet side 6B (right side in FIG. 2) of the same. ), And two pairs of inlets 6B (right side in the figure) of the injection / discharge device 6 are connected to the heating and pressurizing means 5B to 5D, respectively.

As shown in FIG. 2, the receiving side 6A of the injection / discharge device 6 has a nozzle 6a opened at one end, and the nozzle 6a is connected to the tube 6c via a manual opening / closing valve 6b.
Are connected at one end. Of the two pairs of receiving sides 6A, the other ends of the pair of tubes 6c are the injection holes 3c and the discharge holes 3d of the outer mold 3a, and the other ends of the other pair of tubes 6c are the injection holes 1a and the discharge holes of the mold 1. 1b.

The inlet side 6B of the injection / discharge device 6 is provided with a nozzle 6e at the tip opposite to the nozzle 6a, and the nozzle 6e has one end of a bellows-type tube 6g which can expand and contract via a manual opening / closing valve 6f. It is connected. The other end of one or two pairs of tubes 6g is connected to heating and pressing means 5A to 5A.
D steam supply source (not shown) and steam discharge unit (not shown)
Connected to each other. The lower end of each nozzle 6g is connected to the tip of a piston rod 7a of a cylinder device 7, one end of which is fixed to the heating and pressurizing means 5A to 5D. The nozzle 6a is configured to move forward and backward to join or separate from the nozzle 6a. In addition, ring-shaped packings 6d and 6h are mounted on opposing surfaces of the nozzle 6a and the nozzle 6g. In addition, in the vulcanization equipment shown in FIG. 1, a pair of the receiving side 6A of the injection / discharge device 6 on the side of the injection hole 3c and the discharge hole 3d of the vulcanizing can 3 is provided in parallel on the side surface of the vulcanizing can 3, and the receiving side A pair of inlet sides 6B of the injection / discharge device 6 corresponding to 6A is provided in parallel with the heating and pressurizing means 5A to 5D. Further, a pair of the receiving side 6A on the side of the injection hole 1a and the discharging hole 1b of the mold 1 is provided side by side on the upper surface of the vulcanizing can 3, and a pair of the input side 6B of the injection / discharge device 6 corresponding to the receiving side 6A is provided. , Are suspended in parallel from above the heating and pressurizing means 5B to 5D.

As described above, the dies 1 whose molding operation has been completed in the molding step are loaded into the vulcanizing
The mold 1 of each of the heating and pressurizing means 5A to 5C is sequentially conveyed by the carriage 4 to the heating and pressurizing means 5B to 5D in the next step as the carrier is sequentially conveyed to the heating and pressurizing means 5A. The movement of the mold 1 between the heating and pressurizing means 5A to 5D is performed by the receiving side 6A and the input side 6B of the injection / discharge device 6.
The opening and closing valves 6b and 6f are closed, and the pressure of the steam introduced into the bag 3B of the vulcanizing can 3 and the mold 1 is kept constant. If the opening / closing valves 6b and 6f are of the automatic opening / closing type, the labor for the operator to open and close when transporting the mold 1 can be saved, which is convenient. 4
When the vulcanizing operation is completed in each of the divided vulcanizing steps, the mold 1 is taken out of the vulcanizing can 3. Then, after the mold 1 is cooled to near normal temperature by a cooler (not shown), the vulcanized belt molded product 2 is extracted from the mold 1 by a mold remover (not shown). Thereafter, the mold 1 is returned to the molding step. The vulcanized can 3 from which the mold 1 has been removed is also a cart 4
At the same time, it is returned to the first heating and pressing means 5A.

FIG. 5 (a) is a drawing showing another two vulcanization patterns from the inside and outside of the mold, and FIG. 5 (b) is the same drawing (a).
3 is a view showing a mode of division of a vulcanization pattern. FIG.
Is a method in which the vulcanization step is divided into five (A) to (E) every 5 minutes in accordance with the vulcanization pattern and the molding operation time (in this case, 5 minutes). Five heating / pressing means (not shown) are also provided. However, the vulcanization method and the same equipment are basically the same as those in the above-described embodiment.

FIG. 6 (a) is a drawing showing another two vulcanization patterns on the inside and outside of the mold, and FIG. 6 (b) is a drawing showing the same.
It is a figure showing a division mode of a vulcanization pattern of (a). Same figure
The dividing mode of (b) is that the vulcanization step is divided into three (A) to (C) every 8 minutes in accordance with the molding operation time (8 minutes in this case). (Not shown) are provided. However, in the case of this embodiment, (A) of FIG.
As shown in the vulcanization pattern of FIG. 3, three minutes after the steam (vapor pressure P2) is introduced into the vulcanizing can 3 by the first heating and pressurizing means (not shown), It is necessary to introduce steam (steam pressure P1). Other points are basically the same as those of the first and second embodiments.

[0022]

As is apparent from the above description,
The vulcanizing method and the vulcanizing equipment of the present invention have the following effects. (1) According to the vulcanization method of the present invention, the vulcanization process that takes the longest time in the production of a power transmission belt or the like is divided based on the vulcanization pattern and the molding time, thereby making the vulcanization work flow serial. So that it can be manufactured by assembly work,
Production efficiency is greatly improved. Further, as compared with the above-described conventional method, the work of transporting a molded product or a vulcanization container between the vulcanizing step and another step becomes easier. In particular, if the vulcanization step is divided based on the vulcanization pattern, control of the vapor pressure and the like in each heating and pressurizing means of the vulcanization facility can be simplified. (2) According to the vulcanization equipment of the present invention, the vulcanization method of the present invention can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a vulcanizing facility according to an embodiment of the present invention together with a manufacturing process of a power transmission belt.

FIG. 2 is a front view showing a steam injection / discharge device.

FIG. 3 is a sectional view showing an outline of a vulcanization can.

FIG. 4 (a) is a drawing showing two vulcanization patterns from the inner side and the outer side of the mold, and FIG. 4 (b) is a drawing showing a dividing mode of the vulcanization pattern of FIG. 4 (a). It is.

FIG. 5 (a) is another view from the inside and outside of the mold.
FIG. 5 (b) is a drawing showing a divided form of the vulcanization pattern of FIG. 5 (a).

6 (a) is a drawing showing another two vulcanization patterns from the inside and the outside of the mold, and FIG. 6 (b) is the same drawing.
It is a figure showing a division mode of a vulcanization pattern of (a).

FIG. 7 is a flowchart showing a conventional belt manufacturing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Belt molding 3 Vulcanization can (vulcanization container) 4 Cart 5A-5D Heating and pressurizing means 6 Steam injection / discharge device 7 Cylinder device

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Ikeno 3-2-1-15 Meiwadori, Hyogo-ku, Kobe-shi, Hyogo Inside Bando Chemical Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 35/00-35/14

Claims (2)

(57) [Claims] 1. A series of manufacturing steps in which a molding material such as a power transmission belt is molded by a mold, the unvulcanized molded product is charged into a vulcanization container, vulcanized, and the vulcanized molded product is cooled. In the step, the vulcanization step is divided into a plurality of steps based on a vulcanization pattern or the molding operation time, and the unvulcanized molded product is vulcanized between heating and pressurizing means for each of the divided steps. A vulcanization method for a power transmission belt or the like, wherein the vulcanization is performed by sequentially moving the vulcanization container together with the container and performing vulcanization under the vulcanization steps. 2. A molding material such as a power transmission belt is formed on a mold, and then the mold is charged into a vulcanization container and vulcanized. After cooling from the mold, the vulcanization equipment used in a series of manufacturing processes for punching the vulcanized molded product from the mold, the number of vulcanization processes divided based on the vulcanization pattern or the molding operation time A plurality of corresponding heating and pressurizing means are arranged in series at predetermined intervals, and each of the heating and pressurizing means and the vulcanization container are provided with a pair of pressurized high-temperature fluids that can be connected and separated from each other. A vulcanizing facility such as a power transmission belt, wherein a conveying means for connecting an injecting / discharging device and moving the vulcanizing container sequentially is provided between the heating and pressurizing means.