JPH09141673A - Apparatus for continuously vulcanizing rubber sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture always a rubber sheet material with high accuracy of quality by performing operations capable of enhancing compression force at the time of vulcanizing rubber sheet material, thus, reducing the remaining of air within the rubber sheet material, besides, setting arbitrarily compressing and vulcanizing temperature during the vulcanizing period. SOLUTION: On the outside of a compressing area Z of a steel belt 5 being in sliding contact with the rotating roller 1, a compressing means 10 is disposed which comprises a plurality of rear surface compression heat rollers 11 controllable of compression force for compressing the steel belts 5 to the surface side of the rotating roller 1, and on the outside of the compression means 10, an induction heating type heating means 12 is provided for heating the compression means 10 and steel belt 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous vulcanizing apparatus for rubber sheet materials such as conveyor belts, and more particularly to increasing the surface pressure or varying the surface pressure of the rubber sheet material during vulcanization molding. The present invention relates to a continuous vulcanizing apparatus for rubber sheet material, which reduces air residue in the rubber sheet material to improve product quality.

[0002]

2. Description of the Related Art Conventionally, as a continuous vulcanizing apparatus for a rubber sheet material such as a conveyor belt, for example, as shown in FIG. 6, a heated rotary roll 1 (main roll) and a vertical tangential direction of the rotary roll 1 are used. The upper roll 2 and the lower roll 3 arranged in parallel with each other, the steel belt 5 wound around the rotating roll 1, the upper roll 2, the lower roll 3 and the tension roll 4, and further contacting the rotating roll 1. It is composed of a heating means 6 (back surface heater) arranged outside the steel belt 5.

Then, the unvulcanized rubber sheet material W is inserted from between the steel belt 5 wound around the lower roll 3 and the rotating roll 1 and the rotating roll 1 to form the rotating roll 1.
While being held between the steel belt 5 and the steel belt 5, it is heated and vulcanized by the heated rotating roll 1 and the heating means 6,
It is discharged to the outside through the upper roll 2 and the guide roll 7.

A hydraulic cylinder 8 is attached to the tension roll 4, and the tension of the steel belt 5 is adjusted by moving the tension roll 4 in the horizontal direction by the hydraulic cylinder 8 and at the bottom of the heating means 6. The auxiliary pressure roll 9 provided is for pressing the steel belt 5 to the surface side of the rotary roll 1.

[0005]

By the way, in the conventional continuous vulcanizing apparatus as described above, due to the limitation of tensile strength of the steel belt 5, as shown in FIG. The pressure was limited to 5 Kgf / cm ² , and as shown in FIG. 8, the heating temperature was constant with respect to the vulcanization time (minutes).

Therefore, as shown in FIG. 9, a large amount of air remains in the rubber sheet material W due to insufficient pressure of the rubber sheet material W, and the surface of the rubber sheet material W becomes rough due to insufficient pressing force. There was a problem that quality accuracy could not be improved. The present invention was devised by focusing on such conventional problems, and it is possible to increase the pressing force at the time of vulcanization molding of a rubber sheet material, and as a result, the residual air in the rubber sheet material is significantly reduced. To provide a continuous vulcanization apparatus for a rubber sheet material capable of producing a rubber sheet material with high quality accuracy, by which the pressure and the vulcanization temperature can be arbitrarily set during vulcanization molding. The purpose is.

[0007]

In order to achieve the above-mentioned object, the present invention adjusts a pressing force for pressing the steel belt to the surface side of the rotating roll outside the pressing area of the steel belt slidingly contacting the surface of the rotating roll. With possible pressurizing means,
The gist is that the pressurizing means and the heating means for heating the steel belt are provided outside the pressurizing means.

The pressurizing means and the heating means are divided into a plurality of continuous areas, and the pressure and temperature can be adjusted for each area. Further, the pressurizing means is composed of a plurality of heat rolls that advance and retreat by a cylinder, and the heating means uses an induction heating system. The present invention is configured as described above, the pressurizing means capable of pressurizing the steel belt on the outside of the pressurizing region of the steel belt slidably contacting the surface of the rotating roll, and pressing the steel belt toward the axis of the rotating roll, By providing the heating means, the pressure applied to the rubber sheet material can be made higher than in the conventional case, and as a result, the residual air in the rubber sheet material can be remarkably reduced.

Further, the pressurizing means and the heating means are constructed by being divided into a plurality of continuous blocks in the pressurizing region of the steel belt, and the pressurizing force and the temperature can be arbitrarily adjusted for each block. By repeatedly applying high and low pressures, the air on the surface of the rubber sheet material can be released to the outside by the so-called bumping action, and the vulcanization is performed at the vulcanization temperature suitable for the vulcanized product. It can be molded. Further, since the adjustment of the pressing force and the adjustment of the vulcanization temperature can be arbitrarily set, it is possible to vulcanize the thick multi-layer canvas rubber sheet material.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a schematic configuration diagram of a continuous vulcanizing apparatus embodying the present invention, in which 1 is a heated rotating roll (main roll), 2 and 3 are arranged parallel to the vertical tangential direction of the rotating roll 1. Rolls and lower rolls, 4 is a tension roll of a steel belt 5 equipped with a hydraulic cylinder 8, 7 is a guide roll, and W is an unvulcanized rubber sheet material.

Outside the pressurizing zone Z of the steel belt 5 which is in sliding contact with the surface of the rotating roll 1, a plurality of pressurizing pressure adjusting members for pressing the steel belt 5 onto the surface of the rotating roll 1 (in this embodiment) are used. Then, a pressurizing means 10 composed of nine (9) back side pressurizing heat rolls 11 is provided, and an induction heating system for heating the pressurizing means 10 and the steel belt 5 is provided outside the pressurizing means 10. A heating means 12 is provided.

The pressurizing means 10 and the heating means 12 are divided into a plurality of continuous areas in the pressurizing area Z of the steel belt 5, and in the case of this embodiment, four back surfaces are provided. One heating means 12 is provided for the pressurizing heat roll 11, and it is configured into four blocks as a whole. In addition, the pressurizing means 1 in each block
The 0 and the heating means 12 are configured so that the adjustment of the pressing force and the adjustment of the temperature can be arbitrarily set for each block.

As shown in FIG. 2, the back pressure heat rolls 11 of the pressure means 10 are heat rolls 11 as shown in FIG.
Support shafts 11a of both ends via guide members not shown, and hydraulic cylinders (not shown) that move forward and backward toward the axis of the rotating roll 1 are attached to the shaft ends 11a, respectively. Is controlled by the control device.

Therefore, each heat roll 11 advances and retreats toward the center of the steel belt 5 and the rotary roll 1 by the expansion and contraction operation of the hydraulic cylinder, and the steel belt 5 is moved against the surface of the rotary roll 1 by a constant pressing force. It is configured so that it can be pressed. Further, the heating means 12 uses a known induction heating method, and transfers electric energy (induces a current) to the heating material (conductor) by electromagnetic induction, and the heating material itself converts the current into Joule heat. Is the way. In this induction heating, Joule heat is generated in the heating material itself as in the case of direct current heating. In addition, since it is non-contact heating that does not require electrodes like direct energization,
The heat roll 11 of the pressurizing means 10 like a continuous vulcanizer
It is optimal to arrange it outside of. The heating means 12 of each block is also constructed so that the temperature can be controlled independently by a control device (not shown).

The heating means 12 is not limited to the induction heating method described above, and other heating means, for example, steam heating control can be considered. Next, FIG. 3 shows the relationship between the pressurization distribution of the surface pressure (Kgf / cm ² ) with respect to the pressurizing time (minutes) in the conventional continuous vulcanizer corresponding to FIG. In the embodiment, as described above, the pressurizing means 10 is divided into a plurality of blocks and the pressurizing force can be arbitrarily set in each block. Therefore, in the first pressurizing block 10A, 20 Kgf / cm ² is applied. A surface pressure is applied, then, in the second pressure block 10B, a surface pressure of 1.5 Kgf / cm ² is applied, and in the third pressure block 10C, 1.
A surface pressure of 0 Kgf / cm ² is applied.

FIG. 4 shows the heating temperature (° C.) with respect to the vulcanization time (minutes) in the conventional continuous vulcanizer corresponding to FIG. 8.
In the embodiment of the present invention, the heating means 12 is divided into a plurality of blocks as described above, and the heating temperature can be set arbitrarily in each block. Therefore, the heating temperature is lowered stepwise as in the above pressing force.

As described above, by controlling the pressure and the heating temperature stepwise, the rubber sheet material W with respect to the vulcanization (pressurization) time (minutes) as shown in the remaining air amount in FIG.
It was found that the amount of air inside was significantly reduced. As described above, in the embodiment of the invention, the steel belt 5 is pressed toward the mandrel of the rotary roll 1 to the outside of the pressurizing region Z of the steel belt 5 slidingly contacting the surface of the rotary roll 1. By providing the pressure adjusting means 10 and the heating means 12, the pressure applied to the rubber sheet material W can be made higher than in the conventional case, and as a result, the residual air in the rubber sheet material W is retained. It can be significantly reduced.

Further, the pressurizing means 10 and the heating means 12
Is divided into a plurality of continuous blocks in the pressurizing region Z of the steel belt W, and the pressurizing force and the temperature can be arbitrarily adjusted for each block so that the pressurizing force can be increased. By repeating low, air on the surface of the rubber sheet material W can be released to the outside by a so-called bumping action, and vulcanization molding can be performed at a vulcanization temperature suitable for a vulcanized product. . Furthermore,
Since the adjustment of the pressing force and the adjustment of the vulcanization temperature can be arbitrarily set, it is possible to vulcanize the thick multi-layer canvas rubber sheet material.

[0019]

As described above, according to the present invention, the pressurizing means capable of pressurizing the steel belt to the surface side of the rotary roll is provided outside the pressurizing region of the steel belt which is in sliding contact with the surface of the rotary roll. Since the pressurizing means and the heating means for heating the steel belt are provided outside the pressurizing means, the pressurizing force at the time of vulcanization molding of the rubber sheet material can be increased. As a result, the rubber sheet Air residue in the material can be significantly reduced, and the pressing force and vulcanization temperature can be set arbitrarily during vulcanization molding, which has the effect of always producing a rubber sheet material with high quality accuracy. .

Further, the pressurizing means and the heating means are constructed by being divided into a plurality of continuous blocks within the pressurizing region of the steel belt, and the pressurizing force and the temperature can be arbitrarily adjusted for each block. By configuring high and low pressures repeatedly, the air on the surface of the rubber sheet material can be released to the outside by the so-called bumping action, and the vulcanization molding is performed at the vulcanization temperature suitable for the vulcanized product. There is an effect that can be done. Further, since the adjustment of the pressing force and the adjustment of the vulcanization temperature can be arbitrarily set, it is possible to vulcanize the thick multi-layer canvas rubber sheet material.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a continuous vulcanizing apparatus embodying the present invention.

FIG. 2 is an enlarged perspective view of a pressing unit and a heating unit arranged in a pressing region of a steel belt that is in sliding contact with the surface of a rotating roll.

FIG. 3 is an explanatory graph showing the relationship between the pressure distribution of surface pressure (Kgf / cm ² ) with respect to the vulcanization time (minutes) in the continuous vulcanizer.

FIG. 4 is a graph explanatory view showing the relationship of the temperature distribution of the heating temperature (° C.) with respect to the vulcanization time (min) in the continuous vulcanizer.

FIG. 5 is an explanatory graph showing the remaining amount of air in the rubber sheet material with respect to the vulcanization time (minutes).

FIG. 6 is a schematic configuration diagram of a conventional continuous vulcanizing apparatus.

[Fig. 7] Surface pressure (Kgf / c) against conventional vulcanization time (min)
It is a graph explanatory diagram showing a relationship between pressurizing pressure distribution of m ^2).

FIG. 8: Heating temperature (° C.) against conventional vulcanization time (min)
It is a graph explanatory view showing the relationship of the temperature distribution of.

FIG. 9 is an explanatory graph showing the remaining amount of air in the rubber sheet material with respect to the conventional vulcanization time (minutes).

[Explanation of symbols]

1 Rotating Roll (Main Roll) 2 Upper Roll 3 Lower Roll 4 Tension Roll 5 Steel Belt 7 Guide Roll 8 Hydraulic Cylinder 10 Pressurizing Means 11 Back Pressure Heat Roll 12 Heating Means W Rubber Sheet Material Z Steel Belt Pressurizing Area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 29:00

Claims (4)

[Claims] 1. A rubber which is vulcanized by heating while heating a rotating roll and an endless steel belt which moves in a state of being pressed against the surface of the rotating roll while pressurizing and heating the rubber sheet material. In a continuous vulcanizing apparatus for sheet material, a pressurizing means capable of pressurizing the steel belt to the surface side of the rotating roll is provided outside the pressurizing region of the steel belt slidingly contacting the surface of the rotating roll. A continuous vulcanizing apparatus for a rubber sheet material, characterized in that a pressing means and a heating means for heating a steel belt are provided outside the pressing means. 2. The pressurizing means and the heating means are formed into a plurality of continuous blocks in the pressurizing region of the steel belt, and pressurizing adjustment and temperature adjusting are possible for each block. A continuous vulcanizing apparatus for the rubber sheet material according to. 3. The continuous vulcanizing apparatus for a rubber sheet material according to claim 1, wherein the pressurizing means is composed of a plurality of heat rolls that advance and retreat by a cylinder. 4. The continuous vulcanizing apparatus for a rubber sheet material according to claim 1, wherein the heating means is an induction heating type.