JPH0242647B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a return roll device in a continuous rubber sheet vulcanizer.

There is a device that continuously vulcanizes rubber sheets by transporting the rubber sheet into and out of the vulcanizer body on a belt conveyor, and vulcanizing the rubber sheet within the body under appropriate pressure and temperature. . Conventionally, a belt wound by a turret method or the like is used as this conveyor belt, and this belt is fed into the main body together with a rubber sheet from the entrance of the main body, and when the excess belt of the winding roll becomes low, the belt of a new roll is connected, and the belt of the new roll is connected. The long rubber sheet is continuously vulcanized by this method. However, this method has the disadvantage that it requires a lot of time and manpower for maintenance, management, etc., and increases operating costs. In addition, when a rubber sheet is placed on a conveyor belt and passed through the main body, there is a problem that dust may adhere to the surface of the rubber sheet that is not in contact with the belt, and the surface roughness of the front and back surfaces of the rubber sheet The disadvantage is that a uniform product cannot be obtained. Additionally, if the conveyance speed of the belt is increased in order to improve productivity, the length of the vulcanizing can body must be increased in order to secure the specified vulcanization time, which results in larger equipment. There are drawbacks.

This invention was made in order to solve these conventional drawbacks, and it involves continuously transferring a rubber sheet to be vulcanized extruded from an extruder into the main body of a vulcanizing device by a transfer mechanism, and then vulcanizing it. In a continuous vulcanizer configured to perform continuous vulcanization using a vulcanizing medium supplied into the main body of the device, the above-mentioned transfer mechanism includes a pair of upper and lower endless belts, and this endless belt is sandwiched between the entrance and exit portion of the main body. Introduced into the main body,
A return roll and a guide member consisting of an auxiliary roll or a guide plate are arranged near the entrance and exit part of the main body, and the endless belt is wrapped around the return roll and the guide member. After making the endless belt move back and forth within the main body by folding it back using the return roll and guide member,
It is configured to be sent out of the main body.

Embodiments of the present invention will be described below with reference to the drawings. In Figures 1 and 2, 1 is a vulcanizer, into which steam or heated air is blown.
It is configured to maintain a temperature and pressure suitable for vulcanizing the rubber sheet. Vulcanizing can (equipment body)
A pair of upper and lower rolls 3, 4 are arranged at the introduction side end of the roller 1, and sprockets 31, 41 are coaxially provided on the shafts 30, 40 of each roll 3, 4, respectively. Further, a drive sprocket 71, a sprocket 51, and a tension sprocket 8 coaxial with the drive motor 7 are arranged below, and a chain 5 is spanned between these sprockets.
The tension sprocket 8 is held by an extensible shaft 80, and the tension sprocket 8 is held so that the chain 5 has a predetermined tension by expanding and contracting this shaft.
is pressed against chain 5.

Reference numeral 16 denotes an operating handle, which allows the upper roll 3 to be moved up and down to adjust the gap between the rolls 3 and 4. A slit 10 is formed at the end of the vulcanizing can 1, and the rubber sheet 2 is sandwiched between a pair of upper and lower conveyor belts 9, and the rubber sheet 2 is held and transported by the rolls 3 and 4 via the conveyor belt 9. It is fed into the vulcanizing can 1 through the slit 10. Vulcanized can 1
The lead-out side end of the rubber sheet 2 is similarly configured, and the rubber sheet 2 is transferred to the conveyor belt 9 by a pair of upper and lower rolls 3 and 4.
It is extracted by interposing it through the .

The lower conveyor belt 9 reaches a conveyor roll 94 via a tension roll 91, a dancer roll 70, and a tension roll 92 on the outlet side. A weight 72 is connected to the dancer roll 70, and the weight 72 applies necessary tension to the conveyor belt 9. A plurality of conveyor rolls 94 and 93 are arranged near both ends of the vulcanizing can 1, respectively, and a conveyor belt 9 is stretched between the conveyor rolls 94 and 93 so as to reciprocate between them a plurality of times. I have to. The conveyor belt 9 passes through the lowermost conveyor roll 93, passes through tension rolls 92 and 91, and reaches between the introduction rolls 3 and 4.
Although illustration of the upper conveyor belt 9 is omitted, it is configured similarly to the lower conveyor belt.

A vulcanizing can 1 is placed between conveyor rolls 93 and 94.
Legs 11 are provided at appropriate intervals, and support rolls are provided on these legs to support the belt 9.
This prevents bending and allows for smooth movement.

A portion of the conveyor belt that reciprocates between the conveyor rolls 93 and 94 extends around the roll 61 of the tension roll device 6 . This tension roll device 6 is pulled by a winch (not shown) via a wire rope 62, thereby applying an appropriate tension to the conveyor belt 9 stretched around the roll 61.

Reference numeral 50 denotes a meandering correction device, which prevents the belt 9 from twisting sideways by sandwiching the conveyor belt 9 between a pair of upper and lower rolls and guides the belt 9 to a fixed position.

Inside the vulcanizing can 1, return rolls 21 and 21 are arranged near the entrance and exit, respectively, and a conveyor belt 9 holding a rubber sheet is stretched around these to reciprocate inside the vulcanizing can 1. 23 is an auxiliary conveyor roll. The return roll 21 is rotatably held at both ends by holders 25, as shown in FIGS.
It is held by ribs 26 attached to. The holder 25 is attached to the rib 26 via a liner 33, and the height of the return roll 21 can be adjusted depending on the thickness of the liner 26.
Further, the threaded shaft of a tension plate 27 is screwed onto the holder 25, and the shaft 22 of the return roll 21 passes through the tension plate 27, so that movement in the horizontal direction can be adjusted. 29 is a tightening nut, and 34 is a guide pin.

In the return roll section, there is a difference in curvature between the front and back conveyor belts, which may cause wrinkles in the product, but various methods as shown in Figure 5 can be adopted as a means to prevent this. be. In FIG. 5A, an auxiliary roll 35 is arranged below the return roll 21, and the length of the conveyor belt 9 in contact with the return roll 21 is shortened by passing the conveyor belt 9 over both rolls 21 and 35. Thus, this prevents the formation of wrinkles. In FIG. 5B, a guide plate 36 is used instead of the auxiliary roll 35. Figure 5c,
In D, the cross-sectional shape of the return rolls 21a and 21b themselves is polygonal with curved parts to achieve the same effect as described above. In FIG. 5E, the return roll 21c changes its diameter in the longitudinal direction, thereby creating tension in the width direction of the conveyor belt 9,
It is designed to prevent wrinkles from forming. The return roll may be made of steel and may be provided with a rubber lining on its outer peripheral surface. It is also possible to use an expander roll, for example a special roll that slides horizontally and removes wrinkles.

In this configuration, the rubber sheet 2 and the conveyor belt 9 sandwiching it from above and below are moved in the vulcanizing can 1 at a constant speed by the introduction and output rolls 3 and 4, and during this time, a predetermined amount of The rubber sheet 2 is vulcanized by applying temperature and pressure. In the vulcanizing can 1, the rubber sheet 2 is turned back by the return roll 21 and moves back and forth, so even if the vulcanizing can 1 is relatively small, sufficient residence time can be obtained, and therefore the moving speed of the rubber sheet can be increased. Productivity can be improved. In addition, since the rubber sheet 2 is moved with the conveyor belt 9 in close contact with its front and back surfaces, dust is prevented from adhering to it during vulcanization, and the front and back surfaces are kept under the same conditions, resulting in a uniform product. . It is also possible to actively form a pattern on the surface of the rubber sheet 2 using the conveyor belt 9. In this case, as shown in FIG.
A presser roll 24 may be disposed opposite to the presser roll 1, and the pressing force by this presser roll 24 may be adjusted.

Furthermore, if the pair of upper and lower conveyor belts 9 are configured to be endless and long, operation can be continued for a long period of time and automated.
This results in significant labor savings. In addition, long conveyor belts are conveyor rolls 93 and 94.
By reciprocating between the conveyor belts 9 and 9, the tension rolls 91 and 92, the dancer rolls 70, and the tension roll device 6 are arranged to uniformly apply tension to the conveyor belt 9. This ensures that the vehicle runs smoothly.

As explained above, the present invention vulcanizes a rubber sheet by sandwiching it between a pair of upper and lower endless belts and passing it through a vulcanizing can, and in the vulcanizing can, it is moved back and forth by a return roll. As a result, productivity can be improved without increasing the size of the device, and wrinkles caused by the return roll can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a front view of an apparatus showing an embodiment of the present invention, Fig. 2 is a left side view thereof, Fig. 3 is a cross-sectional view of a vulcanizing can, Fig. 4 is a side view of a return roll, and Fig. 5 is a side view of a return roll.
Figures A to E are explanatory diagrams showing modified examples of the return roll. 1... Vulcanized can, 2... Rubber sheet, 3, 4...
Lead-in/out roll, 9... Conveyor belt, 21...
return roll.

Claims (1)

[Claims] 1. A rubber sheet to be vulcanized extruded from an extruder is continuously transferred into the vulcanizing device main body by a transfer mechanism, and continuously vulcanized by a vulcanizing medium supplied into the vulcanizing device main body. In the continuous vulcanizer configured to perform vulcanization, the transfer mechanism has a pair of upper and lower endless belts and a roll mechanism that sandwiches the endless belts at the entrance and exit portion of the main body and introduces and brings them out into the main body. A guide member consisting of a return roll and an auxiliary roll or a guide plate is arranged near the return roll, respectively, and
The endless belt is wound around a return roll and a guide member, and the endless belt is folded back by the return roll and guide member to cause reciprocating movement within the main body, and then is sent out of the main body. Return roll device in continuous rubber sheet vulcanizer.