JP4834601B2 - Rubber sheet vulcanizing apparatus and rubber sheet vulcanizing method - Google Patents

Description

  The present invention relates to a rubber sheet vulcanizing apparatus and a rubber sheet vulcanizing method for vulcanizing while conveying a long unvulcanized rubber sheet.

As this type of vulcanizing apparatus, for example, as shown in Patent Document 1 below, a steel band wound endlessly between a driving wheel and a driven wheel, and an inner peripheral surface side of the steel band are provided. A pair of upper and lower heating / conveying devices each having a flat plate-like heating body are provided, and a long unvulcanized rubber sheet is sandwiched and pressed between the steel bands of the pair of heating / conveying devices. A structure is known in which a rubber sheet is vulcanized while being conveyed by feeding and moving each steel band while being heated by heat from a heating element.
Furthermore, in the vulcanizing apparatus described in this document 1, a plurality of rollers are provided between the inner peripheral surface of the steel band on the side where the pair of heating and conveying devices face each other and the heating body, as described above. When the rubber sheet is vulcanized while being conveyed, the frictional force generated between the heating body and the steel band is reduced by rotating a plurality of rollers as the steel band is moved.
JP-A-5-301299

By the way, it is necessary to pressurize the rubber sheet with a relatively large force at the time of vulcanization. In the vulcanizer, the rubber sheet was pressurized with a constant force until the vulcanization is completed. Even if a plurality of rollers are provided to reduce the frictional force generated between the heating body and the inner peripheral surface of the steel band, the frictional force cannot be significantly reduced.
Therefore, when vulcanizing while feeding and moving each steel band and conveying the rubber sheet, the driving force applied to the steel band cannot be greatly reduced, and the life of the steel band may be shortened. .
Furthermore, since the rubber sheet was pressed with a constant force until the vulcanization was completed, when the rollers were provided as in the conventional vulcanizing device, the shape of each outer peripheral surface of the plurality of rollers There is also a possibility that the surface of the vulcanized rubber sheet becomes uneven and cannot be flattened by being transferred through the steel band.

  The present invention has been made in consideration of such circumstances, and can evade the life of a steel band and can improve the quality of a vulcanized rubber sheet. It is another object of the present invention to provide a rubber sheet vulcanization method.

  In order to solve the above problems and achieve such an object, the rubber sheet vulcanizing apparatus of the present invention includes a steel band wound endlessly between a driving wheel and a driven wheel, and the steel A pair of upper and lower heating / conveying devices each having a flat plate-like heating element provided on the inner peripheral surface side of the band are provided, and a long unvulcanized rubber sheet is provided between each steel band of the pair of heating / conveying devices. A rubber sheet vulcanizing apparatus that vulcanizes by heating with heat from the heating body in a state of being sandwiched and pressurized in the thickness direction, and has a main cylinder chamber partitioned into two chambers by a main piston. Then, one of the two chambers is pressurized, and is connected to the other of the two chambers via a first connection line, and the main cylinder moves the pair of heating and conveying devices relatively close to each other. A sub-cylinder, and By pressing the one chamber in the solder and moving the pair of heating and conveying devices relatively close to each other, the rubber sheet is sandwiched in the thickness direction between the steel bands and pressed from the heating body. A press process for heating with the heat of the sub-cylinder, the hydraulic oil in the cylinder chamber of the sub-cylinder is pushed toward the first connection pipe, the other chamber in the main cylinder is pressurized, and the pair of heating and conveying devices are relatively By moving the steel sheet apart, the steel sheet is fed and moved while being heated by the heat from the heating body in a state where the rubber sheet is pressed between the steel bands with a smaller force than in the pressing step. The pressure holding step of conveying a predetermined amount of the rubber sheet is repeated in this order.

 Further, the rubber sheet vulcanizing method of the present invention includes a steel band wound endlessly between a drive wheel and a driven wheel, and a flat heater provided on the inner peripheral surface side of the steel band. A pair of upper and lower heating / conveying devices are provided, and a long unvulcanized rubber sheet is sandwiched between the steel bands of the pair of heating / conveying devices in the thickness direction and pressed from the heating body. A method for vulcanizing a rubber sheet that is heated and vulcanized, wherein the rubber sheet is vulcanized using the rubber sheet vulcanizing apparatus of the present invention.

In the present invention, since the sub-cylinder is provided, it is possible to surely realize the above-described pressure-holding process, and at the time of the pressure-holding process, the frictional force generated between the heating body and the steel band is suppressed. The driving force applied to the steel band can be reduced, and the life of the steel band can be extended.
Moreover, even if a roller is provided between the heating body and the steel band as in the conventional vulcanizing apparatus, for example, the pressure applied to the rubber sheet at least until the rubber sheet is vulcanized in the pressure holding step. Therefore, it is possible to suppress the outer peripheral surface shape of the roller from being transferred through the steel band.
In addition, since the pressure-holding step is realized as described above, the rubber sheet can be vulcanized by repeating the pressing step and the pressure-holding step in this order, and the driving force applied to the steel band can be increased. While suppressing, it is possible to continuously vulcanize while conveying a long rubber sheet. Therefore, it is possible to shorten the vulcanization time and to prevent the occurrence of an unvulcanized part, and the quality of the vulcanized rubber sheet can be improved.
Further, during the pressure holding step described above, the hydraulic oil in the cylinder chamber of the sub cylinder is pushed out toward the first connection pipe, the other chamber in the main cylinder is pressurized, and the pair of heating and conveying devices are relatively moved. Since the rubber sheet is pressed between the steel bands with a force smaller than that during the pressing step, the pressure applied to the rubber sheet during the pressure holding step is determined by, for example, the thickness of the rubber sheet, etc. Even if there is variation, it can be stabilized, and the quality of the rubber sheet can be improved with certainty.

That is, in order to realize the pressure-holding step, instead of using the sub-cylinder as in the present invention, for example, a chamber to be pressurized out of the two chambers in the main cylinder is separated from the one chamber by a main switching valve. It is conceivable to switch to the other chamber and make the hydraulic pressure applied to the other chamber smaller than the hydraulic pressure applied to the one chamber. The pressure applied to the rubber sheet during the pressure holding process cannot be stabilized, for example, the pressure applied to the rubber sheet is lost.
Furthermore, in order to realize this pressure holding step, instead of the sub cylinder, for example, this vulcanizer is provided with a pair of mechanical stoppers facing each other in the vertical direction. It is conceivable to move the pair of heating / conveying devices relatively apart until they collide with each other. However, in this case, an impact force is applied to the entire vulcanizing device, or the mechanical stopper is easily damaged. There is a risk of increasing the maintenance frequency of the vulcanizer.
Further, in this case, for example, if the thickness of the rubber sheet varies, the distance between the pair of mechanical stoppers also varies during the pressing process, and the relative relationship between the pair of heating and conveying devices during the pressure holding process. It is difficult to stabilize the amount of separation movement, that is, the pressure applied to the rubber sheet, and the quality of the rubber sheet after vulcanization may be deteriorated.

Here, a pair of supply / exhaust pipes that are connected at one end to the two chambers of the main cylinder and supply / discharge hydraulic fluid, and a main switching valve connected to the other ends of the pair of supply / exhaust pipes are provided. A relief valve is provided in each of the pair of supply / exhaust pipes, and the main switching is performed in the supply / exhaust pipe connected to the other chamber of the pair of supply / exhaust pipes rather than the relief valve. An open / close valve may be provided on the valve side.
In this case, with the open / close valve closed, the hydraulic oil in the cylinder chamber of the sub-cylinder is pushed out to the first connection pipe, whereby the internal pressure in the other chamber is increased and the main piston is driven. Accordingly, the hydraulic oil in the one chamber is pushed out to the supply / discharge line connected to the one of the pair of supply / discharge lines.

The sub-cylinder further includes a first sub-cylinder connected to the first connection pipe and a second sub-cylinder having a larger diameter than the first sub-cylinder, and the first sub-cylinder is a first sub-cylinder. The first sub cylinder chamber is divided into two chambers by a piston, and the second sub cylinder is divided into two chambers by a second sub piston connected to the first sub piston. A sub-cylinder chamber is provided in the interior, and the second sub-cylinder chamber is pressurized to operate the second sub-piston, thereby operating the first sub-piston and supplying hydraulic oil in the first sub-cylinder chamber to the first You may be set as the structure extruded in 1 connection pipe line.
In this case, the sub-cylinder is configured to push out the hydraulic oil in the first sub-cylinder chamber into the first connection pipe and pressurize the other chamber of the main cylinder. The relative separation movement amount of the heating and conveying device can be reliably stabilized.
Further, by operating the second sub-piston in the second sub-cylinder having a larger diameter than the first sub-cylinder, the first sub-piston is operated to move the hydraulic oil in the first sub-cylinder chamber into the first connection pipe line. Since it extrudes, a relative separation movement of a pair of above-mentioned heating conveyance apparatus can be performed in a short time.

In addition, a first heat medium passage having a jet hole that opens toward an inner peripheral surface of the steel band toward which the pair of heating and conveying devices face each other is formed in the heating body, and the pressure holding In the process, by applying a fluid pressure of a heat medium from the ejection hole to the inner peripheral surface of the steel band, a gap is formed between the inner peripheral surface of the steel band and a heating body, The rubber sheet may be pressed between the steel bands in the thickness direction.
In this case, since the rubber sheet is pressurized in the thickness direction by the steel band in which a gap is formed between the heating body and the pressure holding step, it becomes possible to pressurize the rubber sheet evenly over the entire area. The quality of the rubber sheet can be further improved, and the frictional force generated between the heating body and the inner peripheral surface of the steel band can be greatly reduced, further enhancing the durability of the steel band. It can also be improved reliably.

  According to this invention, it is possible to avoid shortening the life of the steel band, and to improve the quality of the vulcanized rubber sheet.

Hereinafter, an embodiment of a rubber sheet vulcanizing apparatus according to the present invention will be described with reference to FIGS.
The vulcanizer 10 includes a steel band 13 wound endlessly between a drive wheel 11 and a driven wheel 12, and a flat plate-like heating body 14 provided on the inner peripheral surface side of the steel band 13. A pair of upper and lower heating / conveying devices 15a and 15b are provided, and a long unvulcanized rubber sheet W is sandwiched between the steel bands 13 of the pair of heating / conveying devices 15a and 15b in the thickness direction. In the pressed state, it is configured to be vulcanized by heating with heat from the heating element 14.

The steel band 13 is a stainless steel plate having a thickness of about 0.5 mm to 2.5 mm, for example.
Moreover, the heating body 14 is a flat plate-like body having a size that covers the entire inner peripheral surface 13a of the steel band 13 on the side where the pair of heating and conveying devices 15a and 15b face each other. Further, in the present embodiment, the heating body 14 has a first heat medium passage 14b having an ejection hole 14a that opens toward the inner peripheral surface 13a of the steel band 13, and the first heat medium passage 14b. Is formed with a second heat medium passage 14c of another system.

  In each heating and conveying apparatus 15 a and 15 b, the driving wheel 11, the driven wheel 12 and the heating body 14 are connected via a pair of left and right guide frames 16. Here, sealing means 16a is provided on both sides of each heating and conveying device 15a, 15b, and the heating body 14 is sealed in an airtight or liquid-tight state on the inner peripheral surface side of the steel band 14. . A guide frame 16 is connected to each of the sealing means 16a.

  Further, the vulcanizing apparatus 10 has a main cylinder chamber 18 partitioned into two chambers 18a and 18b by a main piston 17, and one of the two chambers 18a and 18b (hereinafter referred to as rod side chamber). The main cylinder 19 is provided to move the pair of heating and conveying devices 15a and 15b relatively close by pressurizing 18a. In the illustrated example, a pair of left and right main cylinders 19 are provided, and a plurality of main cylinders 19 are arranged at intervals in the direction in which the steel band 13 is fed and moved.

 The rod end of the main piston 17 is connected to a pair of left and right guide frames 16 provided in the upper heating / conveying device 15a. A pair of left and right guide frames 16 provided in the heating and conveying device 15b are fixed. As a result, the rod side chamber 18a of the main cylinder 19 is pressurized and the main piston 17 is moved backward, whereby the upper heating / conveying device 15a descends and approaches the lower heating / conveying device 15b. The other of the chambers 18a and 18b (hereinafter referred to as the head side chamber) 18b is pressurized to move the main piston 17 forward, whereby the upper heating / conveying device 15a rises and is separated from the lower heating / conveying device 15b. It is supposed to be.

And in this embodiment, the sub cylinder 21 connected to the head side chamber 18b of the main cylinder 19 via the 1st connection pipe line 20 is provided. The sub cylinder 21 includes a first sub cylinder 22 connected to the first connection pipe 20 and a second sub cylinder 23 having a larger diameter than the first sub cylinder 22. The main cylinder 19 has a larger diameter than the second sub cylinder 23.
The first sub-cylinder 22 has a first sub-cylinder chamber 25 that is partitioned into two chambers 25a and 25b by a first sub-piston 24, and the second sub-cylinder 23 is a first sub-piston 23. A second sub-cylinder chamber 27 that is partitioned into two chambers 27 a and 27 b by a second sub-piston 26 connected to 24 is provided inside.

  In the illustrated example, the rod portion of the first sub-piston 24 and the rod portion of the second sub-piston 26 are arranged coaxially with each other and formed integrally, and the first sub-cylinder 22 and the second sub-cylinder 23 are Are arranged on the same axis. The first sub cylinder 22 is provided with cylinder switches 22a and 22b for detecting the backward end position and the forward end position of the first auxiliary piston 24, respectively. Further, the first connection pipe line 20 is connected to the head side chamber 25 a of the first sub cylinder 22, and a first opening / closing valve 41 is provided at an intermediate position of the first connection pipe line 20.

Next, details of the hydraulic circuit for driving the main cylinder 19 and the sub cylinder 21 will be described.
The vulcanizing apparatus 10 includes a pair of first supply / discharge pipes 29 and 30 that are connected at one end to the two chambers 18a and 18b of the main cylinder 19 and supply / discharge hydraulic fluid, and the pair of first supply / discharge pipes. A main switching valve 31 connected to the other end of the passages 29 and 30; a second supply / exhaust conduit 36 for supplying and discharging hydraulic oil with one end connected to the head side chamber 27b of the second sub cylinder 23 in the sub cylinder 21; And a sub switching valve 37 to which the other end of the second supply / discharge pipe 36 is connected.

 Furthermore, a check valve 35a and a first relief valve 35b are provided in this order from the hydraulic pump 28 side to the main switching valve 31 side in the main connection line 35 connecting the main switching valve 31 and the hydraulic pump 28. ing. The sub switching valve 37 is connected to a portion of the main connection line 35 located between the first relief valve 35 b and the main switching valve 31 via the first branch pipe 38.

 In the present embodiment, the second relief valve 32 is provided in the rod-side first supply / discharge pipe 29 connected to the rod-side chamber 18a of the main cylinder 19 among the pair of first supply / discharge pipes 29, 30. The head side first supply / exhaust conduit 30 connected to the head side chamber 18 b of the main cylinder 19 is disposed on the side of the main switching valve 31 with respect to the third relief valve 33 and the third relief valve 33. A second opening / closing valve 34 is provided. The relief pressures of the second relief valve 32 and the first relief valve 35b are set to be equal to each other and are set smaller than the relief pressure of the third relief valve 33.

Furthermore, a portion of the first connection pipe line 20 located between the first opening / closing valve 41 and the first sub cylinder 22 is connected to the first branch pipe line 38 via the second branch pipe line 39. The third opening / closing valve 40 is provided at an intermediate position of the branch pipe 39.
As described above, in the present embodiment, the hydraulic oil is sent from one hydraulic pump 28 to the main cylinder 19 and the sub cylinder 21.

Next, a method for vulcanizing an unvulcanized rubber sheet W using the rubber sheet vulcanizing apparatus 10 configured as described above will be described with reference to a flowchart shown in FIG.
The unvulcanized rubber sheet W is unwound from an unillustrated unwinding device, and this rubber sheet W is made to reach between the pair of heating and conveying devices 15a and 15b. At this time, the heat medium is circulated in each of the first heat medium passage 14b and the second heat medium passage 14c of the heating body 14 in advance, and the steel band 13 is heated.

Next, the operation of the hydraulic pump 28 is started (S1), the second opening / closing valve 34 is opened, and the first opening / closing valve 41 is closed (S2).
Further, the sub switching valve 37 is switched to bring the inside of the head side chamber 27b and the second supply / exhaust pipe 36 of the second sub cylinder 23 to atmospheric pressure, and the third opening / closing valve 40 is opened (S3).
As a result, the main connection pipe 35, the first branch pipe 38, the second branch pipe 39, and the first connection pipe 20 are connected from the hydraulic pump 28 to the head side chamber 25a of the first sub cylinder 22 in the sub cylinder 21. The first sub piston 24 is moved forward while sliding in the first sub cylinder 22 and the second sub piston 26 is moved to the second sub cylinder. It is made to move backward while sliding in 23. At this time, since the first on-off valve 41 is closed, the hydraulic oil supplied from the second branch pipe 39 to the first connection pipe 20 does not flow into the head side chamber 18b of the main cylinder 19.

 When the forward end position of the first sub-piston 24 is detected by the cylinder switch 22b provided in the first sub-cylinder 22 (S4), the main switching valve 31 is switched and the rod-side chamber 18a of the main cylinder 19 is switched. The hydraulic oil is supplied from the hydraulic pump 28 through the main connection line 35 and the rod-side first supply / discharge line 29, while the head side chamber 18 b is brought to atmospheric pressure through the head-side first supply / discharge line 30.

 As a result, the main piston 17 of the main cylinder 19 is moved backward, and the upper heating / conveying device 15a is lowered to approach the lower heating / conveying device 15b (S5). Vulcanization is started by sandwiching the rubber sheet W for vulcanization between the steel bands 13 and pressurizing the rubber sheet W at, for example, 3 MPa (pressing process). Simultaneously with the start of vulcanization, counting by a timer is also started (S6).

 At this time, as shown in FIG. 2, in each of the pair of heating and conveying devices 15 a and 15 b, the inner peripheral surface 13 a of the steel band 13 and the heating body 14 come into contact with each other, and there is a gap between these 13 and 14. In the second heat medium passage 14c, which is different from the first heat medium passage 14b mainly having the ejection holes 14a, the heat medium is not ejected from the ejection holes 14a of the heating body 14. The rubber sheet W is heated via the steel band 13 by the heat of the heat medium flowing through the heat medium.

For example, when 4 minutes have elapsed (S7), the second opening / closing valve 34 is closed, the first opening / closing valve 41 is opened, and the third opening / closing valve 40 is closed (S8).
In this state, the sub switching valve 37 is switched so that the main connection pipe 35, the first branch pipe 38, and the second supply / discharge pipe are connected from the hydraulic pump 28 to the head side chamber 27b of the second sub cylinder 23 in the sub cylinder 21. The hydraulic oil is supplied through the passage 36 in this order (S9).

 As a result, in the sub cylinder 21, the second sub piston 26 of the second sub cylinder 23 is moved forward, and the first sub piston 24 of the first sub cylinder 22 is moved backward to move the first sub cylinder 22. The hydraulic oil filled in the head side chamber 25 a is pushed out to the first connection pipe line 20. As described above, when the head side chamber 18b of the main cylinder 19 is pressurized through the first connection pipe line 20, the main piston 17 is moved forward, and the upper heating / conveying device 15a is about 0.5 mm to 1 mm. It rises to a certain extent and moves away from the lower heating / conveying device 15b.

 At this time, the retracted end position of the first sub piston 24 is detected by the cylinder switch 22a provided in the first sub cylinder 22 (S10). Further, at this time, as shown in FIG. 3, fluid pressure (for example, 0.5 MPa to 0.8 MPa) is applied to the inner peripheral surface 13 a of the steel band 13 in the upper heating and conveying device 15 a from the ejection hole 14 a of the heating body 14. By acting, in a state where a gap is formed or widened between the inner peripheral surface 13a of the steel band 13 and the heating body 14, the rubber sheet W is, for example, 0.5 MPa in the thickness direction with the steel band 13. Pressurize with.

In this state, the driving wheel 11 is further driven to rotate, and the heating body 14 is applied over, for example, 1 minute while pressing and heating the rubber sheet W between the steel bands 13 of the pair of heating and conveying devices 15a and 15b. The steel band 13 is transported by a distance from 1 / 30th to 1 / 10th of the total length in the direction in which the steel band 13 is fed and moved (S11, S12, pressure holding step).
Next, after stopping the rotational driving of the drive wheel 11, the second opening / closing valve 34 is opened and the first opening / closing valve 41 is closed (S13), and the pressing step is performed in the same manner as S6 described above (S14).

  During this pressing step, hydraulic oil is filled into the head side chamber 25a of the first sub cylinder 22 in the sub cylinder 21 in the same manner as S3 described above (S15). Then, similarly to S4 described above, it is determined whether or not the forward end position of the first sub piston 24 is detected by the cylinder switch 22b provided in the first sub cylinder 22 (S16), and similarly to S7 described above. It is then determined whether or not the pressing process has been performed for a predetermined time (S17).

  And after repeating S8-S17 mentioned above until the vulcanization | cure of all the rubber sheets W is completed (S18), the main switching valve 31 is switched and the main pump 19 is supplied from the hydraulic pump 28 to the head side chamber 18b. The hydraulic fluid is supplied through the connection pipe 35 and the head-side first supply / discharge pipe 30, while the rod-side chamber 18 a is brought to atmospheric pressure through the rod-side first supply / discharge pipe 29. As a result, the main piston 17 of the main cylinder 19 is moved forward, the upper heating / conveying device 15a is lifted and separated from the lower heating / conveying device 15b, and the rubber sheet is removed from the steel band 13 of the upper heating / conveying device 15a. Leave (S19).

  As described above, according to the rubber sheet vulcanizing apparatus 10 according to the present embodiment, since the sub-cylinder 21 is provided, the above-described pressure-holding step can be reliably realized. In addition, it is possible to reduce the driving force applied to the steel band 13 by suppressing the frictional force generated between the heating body 14 and the steel band 13, and to extend the service life thereof.

  Further, since the pressure holding step is realized as described above, the rubber sheet W can be vulcanized by repeating the pressing step and the pressure holding step in this order, and the drive applied to the steel band 13. While suppressing the force, the rubber sheet W can be continuously vulcanized while being conveyed. Therefore, it is possible to shorten the vulcanization time and to prevent the occurrence of an unvulcanized part, and the quality of the vulcanized rubber sheet can be improved.

  Further, in the present embodiment, during the pressure-holding step, the hydraulic oil in the head side chamber 25a of the first sub cylinder 22 in the sub cylinder 21 is pushed out toward the first connection pipe line 20, and the head side chamber 18b in the main cylinder 19 is pushed. Since the upper heating / conveying device 15a is raised and the pressure applied to the rubber sheet W is smaller than that during the pressing step, the pressure applied to the rubber sheet W during the pressure holding step is For example, even if the thickness of the rubber sheet W varies, the rubber sheet W can be stabilized, and the quality of the rubber sheet W can be reliably improved.

  Furthermore, in the present embodiment, the first sub-piston 24 is operated by operating the second sub-piston 26 in the second sub-cylinder 23 having a larger diameter than the first sub-cylinder 22, thereby operating the first sub-cylinder chamber 25. This hydraulic oil is pushed out into the first connecting pipe line 20, so that the upward heating and conveying device 15a as described above can be moved up and down in a short time.

  In the present embodiment, the rubber sheet W is pressed in the thickness direction by the steel band 13 in which a gap is formed between the heating body 14 and the rubber sheet W evenly throughout the entire area. It becomes possible to pressurize, the quality of the rubber sheet W can be further improved, and the frictional force generated between the heating body 14 and the inner peripheral surface 13a of the steel band 13 can be greatly reduced. As a result, the durability of the steel band 13 can be further improved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the embodiment, in the flowchart shown in FIG. 5, the step (S3 and S4) of filling the hydraulic fluid into the head side chamber 25a of the first sub cylinder 22 is performed before the pressing step (S5 to S7). However, instead of this, the step (S3 and S4) of filling the hydraulic fluid into the head side chamber 25a of the first sub cylinder 22 may be performed during the pressing step.

Moreover, in the said embodiment, although the structure which sends hydraulic oil to the main cylinder 19 and the subcylinder 21 from one hydraulic pump 28 was shown, it replaced with this and the hydraulic pump which sends hydraulic oil to the main cylinder 19 was replaced. A hydraulic pump that sends hydraulic oil to the sub cylinder 21 may be provided.
Further, in each of the pair of heating and conveying devices 15a and 15b, a roller that rotates as the steel band 13 is moved may be provided between the inner peripheral surface 13a of the steel band 13 and the heating body 14.
Moreover, in the said embodiment, although the upper heating conveyance apparatus 15a was provided so that raising / lowering was possible with respect to the lower heating conveyance apparatus 15b, it replaces with this, for example, lower heating conveyance apparatus 15b is an upper heating conveyance apparatus It may be provided so as to be movable up and down with respect to 15a, or each of the pair of heating / conveying devices 15a and 15b may be provided so as to be movable up and down, and may be brought into contact with and separated from each other.

  The shortening of the life of the steel band can be avoided, and the quality of the vulcanized rubber sheet can be improved.

1 is a schematic perspective view of a rubber sheet vulcanizing apparatus shown as an embodiment according to the present invention. FIG. 2 is a longitudinal sectional view of an essential part during a pressing step in the rubber sheet vulcanizing apparatus shown in FIG. 1. It is a principal part longitudinal cross-sectional view at the time of a pressure holding process in the vulcanization | cure apparatus of the rubber sheet shown in FIG. FIG. 2 is a hydraulic circuit diagram of the rubber sheet vulcanizing device shown in FIG. 1. It is a flowchart which shows the process of vulcanizing an elongate unvulcanized rubber sheet using the rubber sheet vulcanizing apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vulcanization device 11 Drive wheel 12 Drive wheel 13 Steel band 13a Inner peripheral surface 14 Heating body 14a Ejection hole 14b 1st heat medium passage 15a, 15b Heating conveyance apparatus 17 Main piston 18 Main cylinder chamber 18a Rod side chamber (one chamber)
18b Head side chamber (the other chamber)
19 main cylinder 20 first connecting pipe 21 sub cylinder 22 first sub cylinder 23 second sub cylinder 24 first sub piston 25 first sub cylinder chamber 26 second sub piston 27 second sub cylinder chamber 29, 30 first supply Exhaust pipe (supply / exhaust pipe)
31 Main switching valve 32 Second relief valve (Relief valve)
33 3rd relief valve (Relief valve)
34 Second open / close valve
W Rubber sheet

Claims (5)

A pair of heating and conveying devices having a steel band wound endlessly between the drive wheel and the driven wheel, and a flat plate-like heating body provided on the inner peripheral surface side of the steel band are provided. Vulcanization of a rubber sheet that is heated and vulcanized with heat from the heating body in a state where a long unvulcanized rubber sheet is sandwiched between the steel bands of a pair of heating and conveying devices in the thickness direction and pressed. A device,
A main cylinder chamber having a main cylinder chamber partitioned into two chambers by a main piston, wherein the one of the two chambers is pressurized to move the pair of heating and conveying devices relatively close to each other;
A sub-cylinder connected to the other of the two chambers via a first connection pipe line,
The one chamber in the main cylinder is pressurized, and the pair of heating and conveying devices are moved relatively close to each other so that the heating is performed with the rubber sheet sandwiched between the steel bands in the thickness direction and pressurized. A pressing process for heating with heat from the body;
By extruding the hydraulic oil in the cylinder chamber of the sub cylinder toward the first connection pipe, pressurizing the other chamber in the main cylinder, and moving the pair of heating and conveying devices relatively apart, rubber is obtained. While the sheet is heated with heat from the heating body in a state where the sheet is pressed with a force smaller than that during the pressing step, each steel band is fed and moved to convey a certain amount of the rubber sheet. A rubber sheet vulcanizing apparatus characterized in that the pressure holding step is repeated in this order. A rubber sheet vulcanizing device according to claim 1,
A pair of supply and discharge conduits connected at one end to the two chambers of the main cylinder to supply and discharge hydraulic oil, and a main switching valve connected to the other end of the pair of supply and discharge conduits;
Each of the pair of supply / exhaust conduits is provided with a relief valve, and the supply / exhaust conduit connected to the other chamber of the pair of supply / exhaust conduits is located closer to the main switching valve than the relief valve. A rubber sheet vulcanizing device characterized in that an opening / closing valve is provided on the rubber sheet. A rubber sheet vulcanizing device according to claim 1 or 2,
The sub-cylinder includes a first sub-cylinder connected to the first connection pipe line, and a second sub-cylinder having a larger diameter than the first sub-cylinder,
The first sub-cylinder has a first sub-cylinder chamber partitioned into two chambers by a first sub-piston, and the second sub-cylinder is formed by a second sub-piston connected to the first sub-piston. A second sub-cylinder chamber divided into two chambers;
A structure in which the second sub-piston is operated by pressurizing the second sub-cylinder chamber to operate the first sub-piston and push out the hydraulic oil in the first sub-cylinder chamber into the first connection pipe line; A rubber sheet vulcanizing apparatus characterized by being made. A rubber sheet vulcanizing apparatus according to any one of claims 1 to 3,
In the heating body, a first heat medium passage having an ejection hole that opens toward an inner peripheral surface of the steel band toward which the pair of heating and conveying devices face each other is formed.
A gap is formed between the inner peripheral surface of the steel band and the heating body by applying a fluid pressure of a heat medium from the ejection holes to the inner peripheral surface of the steel band during the pressure holding step. A rubber sheet vulcanizing apparatus characterized in that a rubber sheet is pressed in the thickness direction between the steel bands. A pair of heating and conveying devices having a steel band wound endlessly between the drive wheel and the driven wheel, and a flat plate-like heating body provided on the inner peripheral surface side of the steel band are provided. Vulcanization of a rubber sheet that is heated and vulcanized with heat from the heating body in a state where a long unvulcanized rubber sheet is sandwiched between the steel bands of a pair of heating and conveying devices in the thickness direction and pressed. A method,
A rubber sheet vulcanizing method using the rubber sheet vulcanizing device according to any one of claims 1 to 4, wherein the rubber sheet is vulcanized.

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