JPH0535230U - Rubber belt vulcanizer - Google Patents

Abstract

(57) [Summary] [Problem] To provide a vulcanizing device having advantages such as low cost, compact structure, uniform vulcanization of a rubber belt, and generation of wrinkles on the surface. A vulcanization device including a rotary vulcanizing drum (mold 1) for winding and heating a rubber belt A, and a pressure band 10 for contacting the surface of the rubber belt A and pressing it while circulating the rubber belt A. However, as the pressing band 10, a flat belt including the core body 11 and having the soft and heat resistant rubber layer 12 on the surface in contact with the rubber belt A is used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rubber belt vulcanizing apparatus using a pressure band.

[0002]

[Prior Art]

 As a device for continuously vulcanizing an unvulcanized rubber belt, there is a device called a rotopress or a rotocure. This device consists of a rotary vulcanizing drum that can heat steam by introducing steam into it, a band-shaped pressure band, and a means for applying tension to the band. An unvulcanized rubber belt is wrapped around the surface of the vulcanization drum (or this and other rotating rolls), and a pressure band with a high tension is pressed against the surface of the rubber belt, while heating the vulcanization drum. By rotating with the pressure band, the rubber belt is continuously vulcanized in the length direction. In some cases, a mold in which a rubber belt is molded on the peripheral surface is used as it is as a vulcanizing drum. Needless to say, the function of the pressure band is to apply pressure to the rubber belt on the vulcanizing drum based on its tension.

Even in the same vulcanizing apparatus, there are various types depending on the arrangement of the vulcanizing drum and other rotating rolls, the path of the pressure band, the means for applying tension to the band, and the like. 59-68222, etc.

In the vulcanizer as described above, a steel band having a thickness of about 1 to 3 mm (hereinafter referred to as a steel band) is conventionally used as the pressure band.

[0005]

[Problems to be solved by the device]

 The conventional vulcanizer using a steel band as a pressure band has the following disadvantages. In other words, a) Steel bands do not have excellent flexibility, so it is necessary to have a large bending radius, and therefore it is difficult to make the vulcanizer compact. With a device that reduces the bending radius of the band by hanging it on a roll with a small diameter, the life of the steel band will be exhausted in a short time while repeatedly bending and stretching.

(B) Since the steel band is difficult to stretch, even if there is a slight error in the shape of the roll or the like on which it is stretched, or the flatness of the shaft, the steel band will experience significantly different tension depending on its widthwise position. .. Therefore, the band is apt to meander, permanent wavy deformation is likely to occur, and it is difficult to apply uniform pressure to the rubber belt.

(C) Since the surface of the band that is in contact with the rubber belt (steel is steel) is hard, wrinkles may occur on the surface of the rubber belt during vulcanization. For example, when vulcanizing a toothed rubber belt on the surface of a vulcanizing drum having a tooth profile groove, the outer diameter of the rubber belt shrinks due to the reason that part of the rubber enters the tooth profile groove during vulcanization. In that case, it is considered that if the surface of the band is hard, the surface of the rubber belt with which it is in contact is firmly bound.

[0008] D) A steel band is a special steel plate and requires a considerable cost, because it must withstand long-term use as long as it is repeatedly bent and stretched under the applied tension. ..

The object of the present invention is that the cost required for the pressure band is low, the device is constructed compactly, the pressure band is easy to handle, the rubber belt is pressed uniformly, and wrinkles are not easily generated on the surface of the rubber belt. -It is to provide a vulcanization apparatus having an advantage.

[0010]

[Means for Solving the Problems]

 The rubber belt vulcanizing device according to the present invention comprises a rotary vulcanization drum (or mold) for winding and heating a rubber belt, and a pressurizing device that circulates and pressurizes the rubber belt on the drum. In a rubber belt vulcanizing device including a band, a core body is included as a pressure band, and a soft or heat-resistant resin or rubber layer is provided on the surface (or other portion) on the side in contact with the rubber belt. It is equipped with a flat belt. The core of the flat belt is made of fiber cord such as wire cord, glass or Kevlar, or sheet such as canvas, polyethylene film or thin steel plate. The heat resistance of the resin or rubber layer must be such that it can be used at the vulcanization temperature of the rubber belt.

The hardness of the surface of the above-mentioned flat belt on the side in contact with the rubber belt is JIS-A as described in claim 2 (that is, the A-type hardness meter of JIS K6301. The same applies hereinafter). It is good to set it to 40 to 70 degrees. Butyl rubber (IIR), EPDM, H-NBR or the like is preferable as a material therefor.

[0012]

[Action]

 The vulcanizer of the present invention uses a flat belt having a layer of soft and heat resistant resin or rubber together with the core as a pressure band. Such a flat belt can be applied as it is to a commercially available belt (or by slightly changing the material of the resin or rubber layer or providing an appropriate additional layer on the surface of the commercially available product). However, they are generally significantly cheaper than steel bands. In addition, since the flat belt, which uses a material with high elasticity such as resin or rubber together with the core body, has excellent flexibility, it can be wound around a small-diameter roll, thus making the vulcanizer compact. Become.

Since the above-mentioned flat belt easily elastically expands and contracts, the tension is likely to be uniform over the entire width even if there is some error in the shape or parallelism of the roll over which it is stretched. Therefore, with this device, the pressure band is easy to handle, such as meandering is easily prevented, and the vulcanization effect is excellent in that the rubber belt is uniformly pressed.

In this apparatus, the surface of the pressure band having the soft and heat resistant resin or rubber layer is used in contact with the rubber belt to be vulcanized. That is, a soft surface comes into contact with the surface of the rubber belt. For this reason, unlike conventional devices that use a steel band, wrinkles are less likely to occur on the surface of the rubber belt even when the toothed belt is vulcanized, thus improving the aesthetics of the product.

From the viewpoint of preventing such wrinkles, the hardness of the pressure band on the side in contact with the rubber belt is 40 to 70 degrees (JIS-A) as described in claim 2. Most preferably. This is because if it is harder than 70 degrees, wrinkles may occur on the surface of the rubber belt as in the case of the steel band. Also, if it is less than 40 degrees, it is not preferable because the pressure band is easily damaged on that surface.

[0016]

【Example】

 1 (a) and 1 (b) are drawings regarding an embodiment of the present invention. Among these, (a) is a schematic view showing a whole perspective view of a vulcanizing device for a transmission rubber belt. To be precise, this vulcanizer vulcanizes an intermediate product called a cylindrical slab before it is sliced and finished into a rubber belt product. In the following description, the intermediate product is called a rubber belt (A). To call. Further, FIG. 1B is a perspective view showing a part of a pressure band used in the vulcanizer in a cross section.

The vulcanizer of FIG. 1 (a) has two pressure bands 10 (the width of which is the axial length of the mold 1) from the left and right on the circumferential surface of a cylindrical mold 1 used as a vulcanizing drum. It is a device (a type of funnel press) that is configured to press the same or higher). The mold 1 is attached to the illustrated apparatus with the preformed (unvulcanized) rubber belt A attached to the peripheral surface thereof. At the time of mounting, the mold 1 is connected to a means (not shown) for introducing and discharging high temperature steam into the inside and a rotation driving means (not shown). Each of the pressure bands 10 is wound around a total of three tension rolls 2 and 3 which are movable and rotatable, and the two inner rolls 2 are moved toward the mold 1 to move the rubber belt A. Pressed against. Since the outer roll 3 moves further outward, tension is applied to the band 10 and a pressure force is applied to the rubber belt A. In this state, if the mold 1 is driven to rotate while being heated, the rubber belt A is heated by the heat from the mold 1 to about 160 ° C. while receiving the pressure from the pressure band 10 circulating with it. It is continuously vulcanized. In order to supplement the pressing force of the band 10 against the rubber belt A on the mold 1, a pressure roll 4 is provided in the middle of the contact area between the two. This roll 4 is also movable and rotatable.

The vulcanizing apparatus of this type in which the two pressure bands 10 are pressed from the left and right onto the unvulcanized rubber belt A on the mold 1 has the following features. That is, a) it is possible to save the trouble of removing the rubber belt A immediately after molding (before vulcanization) from the mold 1 and then mounting it on another vulcanization drum. B) As long as it is inside the roll 2. It can be easily applied to various rubber belts A (die 1) of different sizes and types (with or without teeth). C) The force applied in the direction perpendicular to the axis of the die 1 is offset. Therefore, the mechanism for supporting the mold 1 is simplified, and the pressure applied from the band 10 to the rubber belt A becomes uniform. D) The two bands 10 simultaneously pressurize a wide area. Can be vulcanized uniformly and efficiently. The figure shows the case where the toothed rubber belt A is vulcanized by using the mold 1 having a large number of grooves 1a on the peripheral surface. However, as described in b) above, the vulcanization target of this device is It is not limited to such a rubber belt A.

In this vulcanizing apparatus, flat belts having a structure shown in FIG. 1B are used as the two pressure bands 10. With a total thickness of less than 9 mm, this belt uses a Kevlar cord with a diameter of 1 to 1.5 mm as the core body 11, and a fiber reinforced rubber (CR or H-NBR base rubber combined with aramid short fibers above and below it. The soft rubber layer 14 made of EPDM and butyl rubber is laminated on one surface, and the reinforcing canvas 15 is attached to the other surface. The Kevlar cord, which is the core 11, uses a relatively thin Kevlar cord from the viewpoint of flexibility, but in order to bear the tension applied to the band 10, a large number of Kevlar cords are passed through in parallel with the longitudinal direction of the belt. The soft rubber layer 14 has a heat resistance of more than 180 ° C., and the surface hardness (JIS-A hardness) is 65 degrees. Further, the canvas 15 also serves to protect the band 10 from heat deterioration and cracking. This band 10 is used by wrapping it around the rolls 2 and 3 in the vulcanizer of FIG. 1 (a) with the soft rubber 14 on the outside, that is, the side in contact with the rubber belt A to be vulcanized.

Based on the fact that the pressure band 10 diverting such a flat belt is relatively soft, easily expands and contracts, and has excellent flexibility, the vulcanizing apparatus of FIG. 1 (a) has the following advantages. Equipped. First, since the band 10 (particularly the soft rubber layer 14) is soft, wrinkles are unlikely to occur on the surface of the rubber belt A during vulcanization. Further, since the band 10 is elastically expandable and contractible, it is difficult for the tension to concentrate on a specific portion of the entire width. For this reason, even if the rubber belt A can be pressed uniformly, and if there is some error in the parallelism of the rolls 2 and 3 with respect to the mold 1, the meandering (or disengaging) of the band 10 is unlikely to occur (if necessary, if necessary). It is easy to avoid by providing brims at the upper and lower ends of the rolls 2 and 3). Further, since the band 10 is excellent in flexibility, there is an advantage that the vulcanizer can be made compact because the diameters of the rolls 2 and 3 can be small. The diameter of the roll 2 in this example is 200 mm, which is considerably smaller than that in the conventional vulcanizer (rotopress).

2 and 3 and 4, a pressure band 20 that can be used in place of the belt of FIG. 1 (b) in the apparatus of FIG. 1 (a) or a similar rotopress type vulcanizer. 30 and 40 are shown respectively.

First, like the band 10 of FIG. 1B, the band 20 of FIG. 2 is formed by laminating another soft layer on one surface of a flat belt. That is, one side (on the rubber layer 22) of a commercially available general flat belt having rubber layers 22 and 23 of neoprene (hardness of 80 degrees) above and below a Kevlar (or wire) cord, which is the core body 21. Further, a butyl rubber layer 24 having a hardness of 55 degrees (JIS-A) and a heat resistance (allowable temperature) of 180 ° C. or higher is attached.

In the vulcanizer as described above, the pressure band 20 of FIG. 2 is also rolled (with the butyl rubber layer 24 side facing outward) (the side in contact with the rubber belt to be vulcanized). In case of 1 (a), wrap it around rolls 2 and 3). Since the soft rubber layer 24 comes into contact with the surface of the rubber belt during vulcanization, regardless of the type, material, vulcanization conditions, etc. of the rubber belt, the surface of the rubber belt is vulcanized by vulcanization. Wrinkles are unlikely to occur on the surface. In this example, if the rubber layers 22 and 23 have the same level of heat resistance and softness as the rubber layer 24, it is not always necessary to stack different types of rubber layers 24.

The pressure band 30 of FIG. 3 is a flat belt having the rubber layers 32 and 33 similar to the above on both sides of the core body 31, but laminating the cloth 34 on the surface of one rubber layer 32 side. .. Also for this pressure band 30, the surface of the cloth 34 is placed on the outside of the roll of the vulcanizer, and the rubber belt to be vulcanized is brought into contact with the soft surface of the rubber layer 32 and the cloth 34. Let The cloth 34 is also a reinforcing material for the band 30, but also has a function of facilitating deaeration (air bleeding) from the rubber belt during vulcanization.

The pressure band 40 of FIG. 4 has a core body 41 between the rubber layers 42 and 43 similar to the above, and further includes reinforcing sheets (polyethylene film) 44 and 45 on both sides of the core body 41. I'm out. The tensile strength is increased because the core body 41 and the reinforcing sheets 44 and 45 both bear the tension (may be referred to as the core body), but since the three members are not integrated, the band 40 Flexibility is not bad.

Although the embodiments have been introduced above, it goes without saying that the vulcanizing apparatus of the present invention can be implemented in other modes than the above. For example, a) The rubber belt to be vulcanized is not limited to the annular (endless) one for transmission. This is because even a long, belt-shaped rubber belt that has not yet been formed into a ring can be vulcanized using a vulcanizing drum or a pressure band. It is not impossible to apply the devised device to the vulcanization of conveyor belts.

B) The soft layer of the pressure band on the surface in contact with the rubber belt is not limited to rubber as in the examples, and may be resin. Further, since such a soft material is not required on the side not in contact with the rubber belt, a flat belt having a resin or rubber layer only on one side of the core may be used as the pressing band.

C) Not limited to the vulcanizing apparatus shown in FIG. 1A, another type of apparatus-using a vulcanizing drum other than a mold, a path around a pressure band (roll arrangement) ) And those with different numbers of bands.

[0029]

[Effect of the device]

 The rubber belt vulcanizing apparatus according to the present invention (claims 1 and 2) has the following effects. That is, 1) Since a flat belt, which is inexpensive, is used as the pressing band instead of the steel band, the cost is significantly lower than that of the conventional device.

2) Since the pressure band is excellent in flexibility, the device becomes compact, which further reduces the cost of the device, facilitates maintenance, and occupies a small space in the device, so that the layout is also small. There are many advantages such as freedom.

3) It is easy to prevent the pressure band from meandering. Therefore, some manufacturing errors and mounting errors are allowed in the rolls around which the pressure bands are hung, which also reduces the cost of the device.

4) Since the pressure from the pressure band acts uniformly on the rubber belt, the rubber belt can be uniformly vulcanized.

5) Since wrinkles are not easily generated on the surface of the rubber belt, the rubber belt as a product has an excellent aesthetic appearance.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, and FIG.
It is a schematic diagram which shows the whole vulcanization apparatus of a rubber belt in a perspective view. Further, (b) is a perspective view showing the pressure band used in the vulcanizer including the internal structure.

FIG. 2 is a perspective view similar to FIG. 1 (b) of another pressure band that can be used in the vulcanizer of the present invention in place of the pressure band of FIG. 1 (b).

FIG. 3 is likewise a perspective view of another pressure band.

FIG. 4 is likewise a perspective view of another pressure band.

[Explanation of symbols]

 1 Mold (vulcanization drum) 10.20.30.40 Pressure band 11.21.31.41 Core body A Rubber belt

Claims (2)

[Scope of utility model registration request] 1. A rubber belt vulcanizing apparatus comprising: a rotary vulcanizing drum for winding and heating a rubber belt; A vulcanizing device for a rubber belt, comprising a flat belt including a core body and having a layer of a soft and heat resistant resin or rubber on a surface of the pressing band which is in contact with the rubber belt. 2. The JIS-A hardness of the surface of the flat belt which is in contact with the rubber belt is 40 degrees to 70 degrees.
The rubber belt vulcanizing apparatus according to claim 1, wherein the vulcanizing apparatus is a rubber belt vulcanizing apparatus.