JP6729120B2 - Calendar device - Google Patents

Description

The present invention relates to a calendering device for molding a plastic material such as unvulcanized rubber or resin before crosslinking into a strip-shaped strip.

Conventionally, a calender device for rolling a plastic material between a pair of calender rolls to form a strip strip has been proposed (for example, refer to Patent Document 1 below).

The rolled strip-shaped strip can be spirally wound around, for example, a cylindrical body to form a rubber member for a tire such as a tread rubber or a sidewall rubber. On the other hand, in recent years, there have been various types of blending of plastic materials, and the tackiness thereof has also varied. Therefore, when the strip is molded, it is desired to adjust the surface roughness in consideration of the tackiness of the plastic material.

In the conventional calender device, each calender roll was formed with substantially one type of surface roughness. Therefore, in order to change the surface roughness of the strip, it is necessary to replace the calender rolls each time, which requires a great deal of labor.

JP, 2009-184152, A

The present invention has been devised in view of the above situation, and its main object is to provide a calendering device capable of molding a plurality of types of strips having different surface roughnesses without replacing the calendering roll.

The present invention is a calendering device for rolling a plastic material between a pair of calender rolls to form a strip-shaped strip, wherein the pair of calender rolls is supported slidably in an axial direction with respect to a frame. A first outer peripheral surface and a second outer peripheral surface having a surface roughness different from that of the first outer peripheral surface are formed side by side in the axial direction. The strip can be formed by switching the first outer peripheral surface and the second outer peripheral surface by sliding the first calender roll in the axial direction.

In the calender apparatus of the present invention, the pair of calender rolls includes a second calender roll supported slidably in the axial direction independently of the first calender roll with respect to the frame, and the second calender. A third outer peripheral surface and a fourth outer peripheral surface having a surface roughness different from that of the third outer peripheral surface are formed on the roll side by side in the axial direction, and the second calender roll is slid in the axial direction. Therefore, it is desirable that the strip can be formed by switching the third outer peripheral surface and the fourth outer peripheral surface.

In the calendar device of the present invention, by sliding the first calender roll and the second calender roll in the axial direction, the first outer peripheral surface and the second outer peripheral surface are respectively the third outer peripheral surface and the third outer peripheral surface. It is desirable to be able to face the fourth outer peripheral surface.

In the calendar device of the present invention, it is desirable that each of the first outer peripheral surface and the second outer peripheral surface be provided with a groove extending along the circumferential direction of the calender roll.

In the calendar device of the present invention, it is desirable that a first slide means for sliding the first calendar roll is provided.

In the calendar device of the present invention, it is desirable that a second slide means for sliding the second calendar roll is provided.

The calender device of the present invention includes a first calender roll axially slidably supported with respect to the frame. The first calender roll is formed with a first outer peripheral surface and a second outer peripheral surface having a surface roughness different from that of the first outer peripheral surface in the axial direction. The first calender roll is slid in the axial direction. As a result, the strip can be molded by switching between the first outer peripheral surface and the second outer peripheral surface. Such a calendering device can form strips with different surface roughness without changing the calender rolls.

It is a side view of the calendar device of this embodiment. It is a partial front view of the calendar apparatus of FIG. It is a partially expanded perspective view of the calendar apparatus of other embodiment of this invention. It is a partially expanded perspective view of the calendar apparatus which shows one Embodiment of a 1st slide means. (A) And (b) is a partial front view of a calendar device explaining an operation of the 1st slide means. It is a partially expanded perspective view of a calendar device explaining an operation of the 1st slide means. (A) And (b) is a partial front view of the calendar apparatus of other embodiment of this invention. (A) And (b) is a partial front view of the calendar apparatus of other embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a calendar device 1 according to an embodiment of the present invention. As shown in FIG. 1, the calendar device 1 is a device for rolling a plastic material to form a strip 4 in a strip shape. Examples of the plastic material include unvulcanized rubber and resin before crosslinking. In the present embodiment, as the plastic material, unvulcanized rubber used for a tire member for molding an unvulcanized tire is adopted.

In FIG. 1, unvulcanized rubber is supplied from the extruder 2 in the direction of arrow A, for example. The extruder 2 of the present embodiment, for example, extrudes the rubber material kneaded by the screw 12 in a substantially quantitative manner by the gear pump 13 and discharges the rubber preformed into a predetermined cross-sectional shape by the mouthpiece portion 14. Then, the preformed rubber is supplied to the calender device 1.

The calendar device 1 is provided on the downstream side of the extruder 2 in the direction A, which is the flow of the rubber. The calender device 1 rolls the preformed rubber from the extruder 2 between a pair of calender rolls 3 to form a strip 4 having a desired cross-sectional shape. In the present embodiment, the rolled strip 4 is, for example, spirally wound around a cylindrical body or the like to form a rubber member for a tire such as tread rubber or sidewall rubber (not shown).

FIG. 2 shows a partial front view of the calendar device 1 as seen from the downstream side. As shown in FIG. 2, the calendar device 1 includes a frame-shaped frame 5 fixed to the floor surface, a pair of support shafts 11, and a pair of calendar rolls 3.

The frame 5 includes, for example, a pair of vertical members 5a extending in the height direction and a pair of horizontal members 5b extending horizontally between them.

The pair of support shafts 11 are rotatably supported by the frame 5, for example. In the present embodiment, each support shaft 11 is supported by, for example, a pair of vertical members 5a so that the axial direction is horizontal. The pair of support shafts 11 includes, for example, a first support shaft 11a and a second support shaft 11b arranged below the first support shaft 11a.

The pair of calender rolls 3 includes, for example, a first calender roll 6 and a second calender roll 7 arranged below the first calender roll 6.

The 1st calender roll 6 is supported by the 1st support shaft 11a, for example. The first calender roll 6 rotates integrally with the first support shaft 11a and is movably supported in the axial direction of the first support shaft 11a. The 1st calender roll 6 of this embodiment and the 1st support shaft 11a are fitted by the spline groove (illustration omitted) which extends in an axial direction, for example. Thereby, the first calender roll 6 is supported so as to be slidable in the axial direction with respect to the frame 5.

The first calender roll 6 is formed in a cylindrical shape and has a cylindrical outer peripheral surface. The first calender roll 6 is formed with a first outer peripheral surface 16 and a second outer peripheral surface 17 having a surface roughness different from that of the first outer peripheral surface 16 in the axial direction. In the present embodiment, for example, the second outer peripheral surface 16 has a surface roughness smaller than that of the first outer peripheral surface 16.

The width of each outer peripheral surface 16, 17 in the axial direction is formed to be at least larger than the width of the strip 4 to be formed. In the present embodiment, one side (left side in FIG. 2) of the axial center position 6c of the first calender roll 6 is configured as the first outer peripheral surface 16, and the other side (right side in FIG. 2) of the central position 6c is formed. , The second outer peripheral surface 17.

In the present embodiment, the first calender roll 6 slides to one side or the other side in the axial direction, so that the first outer peripheral surface 16 and the second outer peripheral surface 17 are selectively selectively attached to the first support shaft 11a. It can be located in the central part in the axial direction of.

The surface roughness of each outer peripheral surface 16, 17 can be adjusted by a known method such as shot blasting or coating. As the coating process, for example, a method of coating a metal material or a ceramic material can be adopted.

The surface roughness Ra of each outer peripheral surface 16, 17 may be appropriately determined according to the application of the strip 4 to be molded. The surface roughness Ra of each outer peripheral surface 16, 17 is not particularly limited, but is preferably 0.40 to 3.50 μm, for example. In the present embodiment, the surface roughness Ra of the first outer peripheral surface 16 having a relatively large surface roughness is, for example, about 1.80 to 3.50 μm, and the second roughness having a relatively small surface roughness. The surface roughness Ra of the outer peripheral surface 16 is, for example, about 0.40 to 1.10 μm. However, the surface roughness Ra of each outer peripheral surface 16, 17 is not limited to such a range. In addition, in this specification, "surface roughness Ra" is arithmetic mean roughness Ra defined by JISB0601-2001.

Although the outer peripheral surface having two types of surface roughness is formed on the first calender roll 6 of the present embodiment, the outer peripheral surface having three or more types of surface roughness is not limited to such an aspect. May be formed side by side in the axial direction.

On the first outer peripheral surface 16 and the second outer peripheral surface 17 of the present embodiment, for example, a groove 20 extending along the circumferential direction of the calender roll 6 is provided. The groove 20 has, for example, a cross section corresponding to the cross-sectional shape of the strip 4 to be molded.

The second calendar roll 7 of the present embodiment is supported by the second support shaft 11b. The second calendar roll 7 can rotate integrally with the second support shaft 11b. The second calender roll 7 of the present embodiment is fixed to, for example, the central portion of the second support shaft 11b in the axial direction and is supported so as not to move in the axial direction.

The second calender roll 7 has, for example, a width in the axial direction that is similar to that of the first outer peripheral surface 16 or the second outer peripheral surface 17. By sliding the first calender roll 6, the second calender roll 7 can selectively face either one of the first outer peripheral surface 16 and the second outer peripheral surface 17 of the first calender roll 6.

The outer peripheral surface of the second calender roll 7 of the present embodiment has, for example, one type of surface roughness. The surface roughness of the outer peripheral surface of the second calender roll 7 is set in the same range as the surface roughness of the outer peripheral surface of the first calender roll 6 described above, for example.

Each of the calendar rolls 6 and 7 is rotationally driven by, for example, an electric motor 9 (shown in FIG. 1). The electric motor 9 and one of the support shafts of the calender rolls 6 and 7 are connected by a chain, a belt or the like via a reduction gear (not shown). Further, the support shafts of the first calender roll 6 and the second calender roll 7 can rotate in mutually opposite directions by gears meshing with each other.

The preformed rubber supplied from the extruder 2 passes through the gap between the calender rolls 6 and 7 which rotate in mutually opposite directions, so that the strip 4 having a desired cross-sectional shape is rolled. Therefore, the surface roughness of the outer surface of the strip 4 on the first calender roll 6 side is similar to the surface roughness of the outer peripheral surface of the first calender roll 6. The surface roughness of the outer surface of the strip 4 on the second calender roll 7 side is similar to the surface roughness of the outer peripheral surface of the second calender roll 7.

In the calender device 1 of the present embodiment, the strip 4 can be molded by sliding the first calender roll 6 in the axial direction to switch between the first outer peripheral surface 16 and the second outer peripheral surface 17 having different surface roughnesses. is there. That is, in the case of the present embodiment, the outer surface of the strip 4 on the side of the first calender roll 6 can be formed with a surface roughness close to the surface roughness of either the first outer peripheral surface 16 or the second outer peripheral surface 17. Such a calender device 1 can mold the strips 4 having different surface roughnesses without replacing the calender rolls 6.

For example, when a highly adhesive rubber strip used for tread rubber or the like of studless tires is molded, such a strip 4 may stick to the outer peripheral surface of the calendar roll or the outer surface of the conveyor, which may reduce the productivity. is there. In such a case, it is desirable to form the strip by using one of the outer peripheral surfaces 16 and 17 of the first calender roll 6 having a relatively large surface roughness. In this case, the surface roughness of the outer surface of the strip can be increased, and thus the sticking of the strip to the calender roll side can be prevented.

Further, for example, in the case of molding a strip of rubber having low tackiness used for a tread rubber containing silica rich, when such a strip is spirally wound around a molding drum or the like, it is difficult for the strip to stick to the outer surface of the molding drum. , There is a risk that productivity will decrease. In such a case, it is desirable to form the strip by using one of the outer peripheral surfaces 16 and 17 of the first calender roll 6 having a relatively small surface roughness. As a result, the surface roughness of the outer surface of the strip can be reduced, and the adhesiveness between the strip and the molding drum can be improved to improve the adhesion to the molding drum.

As described above, the calender device 1 of the present embodiment can mold various types of strips 4 according to the usage state without replacing the first calender roll 6.

As a desirable mode, the first outer peripheral surface 16 and the second outer peripheral surface 17 are provided with, for example, grooves 20 having different shapes or sizes. This makes it possible to form strips 4 having different shapes and dimensions without replacing the calender rolls 6.

It is desirable that the calendar device 1 of the present embodiment be provided with a fixing means 15 for fixing the first calender roll 6. The fixing means 15 includes, for example, a concave portion 15a in which the outer surface of the first support shaft 11a is recessed, and a plunger 15b provided on the inner peripheral surface of the first calender roll 6. The plunger 15b is biased by an elastic member such as a spring so as to project inward in the radial direction of the calender roll. When a force for sliding the first calender roll 6 is applied, the plunger 15b can be recessed to the outside in the radial direction of the calender roll, and slides on the first support shaft 11a so as not to hinder the sliding. .. Further, when the plunger 15b is arranged at the same position as the concave portion 15a, the plunger 15b projects toward the concave portion 15a and is inserted into the concave portion 15a, so that the axial position of the first calendar roll 6 can be fixed.

FIG. 3 shows a partially enlarged perspective view of a calendar device 1 according to another embodiment. In FIG. 3, a part of the frame 5 is omitted for easy understanding of the invention. As shown in FIG. 3, in this embodiment, first slide means 24 for sliding the first calender roll 6 is provided.

The first slide means 24 includes, for example, a support shaft 25 provided on the frame 5 and a lever 26 provided on the support shaft 25. The support shaft 25 is provided, for example, on a side surface of the lateral member 5b of the frame 5, and extends toward the downstream side in the A direction (shown in FIG. 1) in a direction orthogonal to the axial direction of the first calender roll 6. The lever 26 is slidably supported along the axial direction of the support shaft 25. The lever 26 is swingably supported with the support shaft 25 as a fulcrum.

The first end portion 31 of the lever 26 is provided with a connecting portion 28 that can be detachably connected to the first calender roll 6. On the other hand, the outer peripheral surface of the first calender roll 6 is provided with a recess 29 for connecting with the connecting portion 28. The connecting portion 28 includes, for example, a pin 30 that can be inserted into the recess 29.

FIG. 4 shows a partially enlarged perspective view when the pin 30 of the connecting portion 28 is connected to the recess 29 of the first calender roll 6. As shown in FIG. 4, when the lever 26 slides along the support shaft 25 toward the first calender roll 6 side, the pin 30 of the connecting portion 28 is inserted into the recess 29.

5A and 5B are partial front views of the calendar device 1 with the pin 30 inserted in the recess 29. As shown in FIGS. 5A and 5B, by swinging the lever 26 in a state where the connecting portion 28 is connected to the first calender roll 6, the first calender roll 6 can be easily axially moved. Can be slid.

As shown in FIGS. 3 and 4, the lever 26 of the present embodiment is bent in an L-shape on the opposite side of the first calendar roll 6 between the support shaft 25 and the second end 32, for example. There is. Such a lever 26 helps avoid interference with the frame 5.

It is desirable that the second end 32 side of the lever 26 is provided with a mounting portion 27 for mounting an extension member 36 such as a rod. The mounting portion 27 of the present embodiment is, for example, a hole that penetrates the lever 26. When the lever 26 is swung, the extension member 36 such as a rod is attached to the attachment portion 27, and the extension member 36 is used as a force point, so that the first calender roll 6 can be slid with a smaller force.

In the present embodiment, fixing means 33 is provided for detachably fixing the first end 31 of the lever 26 to the frame 5 when the lever 26 is not used. In this embodiment, for example, the frame 5 is a metal material such as iron that can be attracted to a magnet, and the fixing means 33 is a magnet 34 fixed to a lever.

FIG. 6 shows a partially enlarged perspective view of the calendar device 1 when the lever 26 is fixed to the frame 5. As shown in FIG. 6, in this embodiment, the lever 26 is swung so that the magnet 34 approaches the frame 5, and the lever 26 is slid toward the calender roll 6 side in the axial direction of the support shaft 25. Thereby, the magnet 34 can be attracted to the vertical member 5 a of the frame 5. The fixing means 33 can prevent the lever 26 from swinging when not in use, and thus can prevent the lever 26 from coming into contact with the calender roll 6 during strip forming.

7(a) and 7(b) are partial front views of a calendar device 1 according to another embodiment of the present invention. As shown in FIGS. 7A and 7B, in this embodiment, the first calender roll 6 axially slidably supported on the frame 5 and the first calender roll 6 are independent of each other. And a second calender roll 7 supported axially slidably with respect to the frame 5.

The second calender roll 7 has, for example, a width in the axial direction that is similar to that of the first calender roll 6. The second calender roll 7 is formed with a third outer peripheral surface 18 and a fourth outer peripheral surface 19 having a surface roughness different from that of the third outer peripheral surface 18 in the axial direction. The axial width of each outer peripheral surface 18, 19 is, for example, about 0.4 to 0.6 times the axial width of the second calender roll 7. In the present embodiment, one side (the left side in FIG. 7) of the axial center position 7c of the second calendar roll 7 is configured as the third outer peripheral surface 18, and the other side (the right side in FIG. 7) of the central position 7c is formed. , And the fourth outer peripheral surface 19.

By the second calender roll 7 sliding to one side or the other side in the axial direction, the third outer peripheral surface 18 and the fourth outer peripheral surface 19 are respectively located at the central portions in the axial direction of the second support shaft 11b. be able to. As a result, in the calendar device 1 of the present embodiment, the strip 4 can be molded by switching the third outer peripheral surface 18 and the fourth outer peripheral surface 19 by sliding the second calender roll 7 in the axial direction.

That is, in this embodiment, by sliding the first calender roll 6 and the second calender roll 7 in the axial direction, the first outer peripheral surface 16 and the second outer peripheral surface 17 of the first calender roll 6 respectively move to the second The calender roll 7 can be opposed to the third outer peripheral surface 18 and the fourth outer peripheral surface 19.

Therefore, in this embodiment, the surface roughness of the outer surface of the strip 4 on the side of the second calender roll 7 can be changed without replacing the calender rolls 6 and 7, and thus more types of strip 4 can be molded. be able to.

FIGS. 8A and 8B show partial front views of a calendar device 1 according to still another embodiment. As shown in FIGS. 8A and 8B, in the present embodiment, the first calender roll 6 and the second calender roll 7 supported slidably in the axial direction with respect to the frame 5, and the first calender. First slide means 24 for sliding the roll 6 and second slide means 35 for sliding the second calender roll 7 are provided. The first slide means 24 and the second slide means 35 include the same configurations as the slide means described above.

In this embodiment, since the first calender roll 6 and the second calender roll 7 are slidably supported, more types of strips can be molded. Further, in the present embodiment, since each calender roll is provided with the sliding means, it is possible to easily switch the outer peripheral surfaces.

In each of the above-described embodiments, as shown in FIG. 2, the first calender roll 6 is slidable with respect to the frame 5 supporting the first calender roll 6, but the present invention is limited to such an aspect. For example, the frame 5 may be divided into a main body portion installed on the floor and a support portion that supports the first calender roll 6, and the support portion may move in the axial direction with respect to the main body portion. ..

Although one embodiment of the calendar device of the present invention has been described in detail above, the present invention is not limited to the above specific embodiment, and can be carried out in various modes.

3 Pair of calender rolls 4 Strip 6 First calender roll 16 First outer peripheral surface 17 Second outer peripheral surface

Claims (6)

A calendering device for rolling a plastic material between a pair of calender rolls to form a strip-shaped strip,
The pair of calender rolls includes a first calender roll axially slidably supported with respect to the frame,
On the first calender roll, a first outer peripheral surface and a second outer peripheral surface having a surface roughness different from that of the first outer peripheral surface are formed side by side in the axial direction,
A calender device capable of forming the strip by switching between the first outer peripheral surface and the second outer peripheral surface by sliding the first calender roll in the axial direction. The pair of calender rolls includes a second calender roll that is slidably supported in the axial direction independently of the first calender roll with respect to the frame,
On the second calender roll, a third outer peripheral surface and a fourth outer peripheral surface having a surface roughness different from that of the third outer peripheral surface are formed side by side in the axial direction,
The calendering device according to claim 1, wherein the strip can be molded by switching the third outer peripheral surface and the fourth outer peripheral surface by sliding the second calender roll in the axial direction. By sliding the first calender roll and the second calender roll in the axial direction, the first outer peripheral surface and the second outer peripheral surface can face the third outer peripheral surface and the fourth outer peripheral surface, respectively. The calendar device according to claim 2. The calendar device according to any one of claims 1 to 3, wherein each of the first outer peripheral surface and the second outer peripheral surface is provided with a groove extending along a circumferential direction of the calender roll. The calendar device according to any one of claims 1 to 4, further comprising a first slide means for sliding the first calendar roll. The calendar device according to claim 2 or 3, further comprising a second slide means for sliding the second calendar roll.

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