JPH10196618A - Roll connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll connection structure which can properly arrange an inner pipe and can properly prevent cracking from occurring. SOLUTION: In a roll connection structure 10 in which two rolls 11 and 12 are connected axially to each other with an inner pipe 14, a recessed part 13 is formed in the inner peripheral surface of at least one roll on the connection side end part, the inner pipe to connect the two rolls is formed with an inner pipe body 14a of roughly the same outside diameter as the inner diameter of these rolls and a protruded part 14c which is provided on the outer peripheral surface of the inner pipe body and of the same axial length as that of the recessed part, the connection end parts of the two rolls are fitted into the inner pipe 14, the inner peripheral surfaces of the two rolls are brought in contact with the outer peripheral surface of the inner pipe body, and the recessed part axial surface is brought in contact with the protruded part axial end surface of the inner pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roll joining structure, and more particularly, to a roll joining structure in which two rolls are joined in an axial direction by an inner tube.

[0002]

2. Description of the Related Art Conventionally, in the field of paper making machines and film making machines, industrial rolls for winding paper, films and the like manufactured as one of the components thereof have been used. As this industrial roll, a metal cylindrical roll or a metal cylindrical roll provided with another metal plating or rubber lining is known.

[0003] The length of these industrial rolls in the axial direction is generally set to a maximum of about 4 m. However, in recent years, the size of papermaking machines and the like and the efficiency of paper production have been improved. Accordingly, there is an increasing demand for a long industrial roll having an axial length of, for example, about 10 m.

[0004] However, when such a relatively long industrial roll is to be manufactured as an integral product, it is necessary to increase the size of the roll manufacturing machine and to improve the precision of forming due to the lengthening of the roll. It is actually very difficult. Therefore, a long roll is actually manufactured by joining a plurality of short rolls in the axial direction to have a desired length in the axial direction.

Generally, in a method of obtaining a long roll by joining a plurality of short rolls in the axial direction, the rolls are joined as follows. That is, as shown in FIG. 2, at the joining-side end of the two rolls 1 and 2, the wall thickness is increased by forming the enlarged diameter portion 1 a and the reduced diameter portion 2 a at the inner and outer peripheral portions thereof. The fitting ends 1b and 2b which are about half are formed.

When joining the two rolls 1 and 2, the fitting end 1 b of one roll 1 is connected to the fitting end 2 b of the other roll 2.
b. Both fitting ends 1b,
2b are fixed with an adhesive such as a bond applied to the contact surface. Further, pins 3 are provided on the overlapping fitting ends 1b, 2b in the roll radial direction so as to penetrate the overlapping fitting ends 1b, 2b, thereby preventing the fitting ends 1b, 2b from shifting.

As shown in FIG. 2, a cylindrical inner tube 4 is provided in the rolls 1 and 2 as needed. The inner tube 4 is generally provided so as to apply the joining portion of the rolls 1 and 2 from the inside, and the rolls 1 and 2 are bonded by an adhesive.
Adhered to 2. The inner tube 4 reinforces the joint between the rolls 1 and 2 against external force.

[0008]

However, in the conventional roll joining structure, when an external force, for example, in the roll radial direction is applied to the joining portion of the rolls 1 and 2, the fitting ends 1b and 2b.
As described above, the thickness of each of the rolls 1 and 2 is approximately one half of that of the rolls 1 and 2, and therefore, the thickness of the rolls 1 and 2 cannot withstand the stress concentration acting on the respective corners of the enlarged diameter portion 1a and reduced diameter portion 2a. There is a problem that cracks 5 are generated from each corner.

This problem can be prevented to some extent by appropriately arranging the above-described inner tube 4 in the rolls 1 and 2. However, when joining the one roll 1 and the other roll 2, the inner tube 4 is likely to be displaced in position. Also, the position of the inner tube 4 is often shifted due to the use of a roll or the like thereafter.

Furthermore, it is difficult to judge whether the position of the inner tube 4 is appropriate or not. In many cases, even if the position of the inner tube 4 is shifted, it cannot be recognized. . Therefore, even when the inner tube 4 is provided, the joint portion between the rolls 1 and 2 is not appropriately reinforced by the displacement of the inner tube 4 from an appropriate position, and cracks 5 are often generated.

An object of the present invention is to solve such a conventional problem, and provides a roll joining structure in which an inner pipe can be appropriately arranged and cracks can be appropriately prevented from occurring. Is to do.

[0012]

The present invention is a roll joining structure, and is configured as follows to solve the above-mentioned technical problem. That is, the present invention is a joining structure in which two rolls are joined in an axial direction by an inner tube,
A concave portion is provided on the inner peripheral surface of the joining side end of at least one of the rolls. An inner pipe in which a convex portion having substantially the same axial length as the axial length is formed between one end and the other end of the inner pipe main body, is formed in the axial direction of the concave portion and the convex portion of the inner pipe in the axial direction. The two rolls are joined by inserting the other roll into the inner pipe main body of the inner pipe protruding from one roll end, until the two rolls are brought into contact with each other. Hereinafter, the components of the present invention will be described individually.

The concave portion and the convex portion of the inner tube formed on the inner peripheral surface of the joining side end of the roll are used for positioning when the inner tube is first inserted into one roll and for preventing the inner tube from shifting in the axial direction. Since it functions particularly, it may be provided on one of the two rolls. Of course, it is preferable to be provided on both of the two rolls. When a concave portion is provided on both of the two rolls, it is necessary to form the concave portion and the convex portion with dimensions such that the axial surface of the convex portion and the axial surface of each concave portion are in contact with each other. Although the axial length of the concave portion provided in each roll can be set as appropriate, it is preferable that the axial length be equal.

If only one of the two rolls is provided with a concave portion, when one end surface of the convex portion in the axial direction abuts on the inner surface of the concave portion of one roll, the axial direction of the convex portion is reduced. The other end face needs to be formed in such a dimensional relationship as to form a flat face with the end face of the roll.

The shape, number and location of the projections are not limited as long as the inner tube can be prevented from shifting in the axial direction. For example, it is preferable to provide one annular convex portion on the outer peripheral surface of the inner pipe main body, but a plurality of convex portions may be provided so that the radial cross section of the inner pipe main body has a convex gear shape. Further, it is preferable that the convex portion is provided, for example, at a substantially intermediate portion of the inner tube main body, since the inner tube is disposed substantially equally between the two rolls.

If the length of the convex portion in the axial direction is substantially the same as the length of the concave portion in the axial direction, when the two rolls are fitted into the inner tube, the shafts at the joint-side ends of the two rolls are fitted. This is preferable in that the end faces in the direction come into contact with each other. However, it is preferable that the ratio of the axial length of the projection to the axial length of the inner tube body is smaller. The components described above can be combined as much as possible.

Examples of the material of the two rolls include metals such as iron and aluminum, and synthetic resins.
It is preferable to use RP (carbon fiber reinforced plastic). The inner pipe main body constituting the inner pipe functions as a joint between two rolls, and has an outer diameter dimension substantially equal to, preferably slightly larger than, the inner diameter of the two rolls. It is preferable that the inner tube main body is formed so as to press the inner peripheral surfaces of the two rolls so as to be in contact with each other, since the center axes of the two rolls can be easily matched.

(Additional components of the present invention) The joining structure of the roll according to the present invention consists of the above-mentioned essential components, but is established even when the components described below are added. I do. The additional components are:
In one of the rolls, the thickness of the portion where the concave portion is provided is greater than the thickness of the convex portion of the inner tube, and the convex portion of the inner tube is tightly fitted in the concave portion. This is preferable in that cracks due to stress concentration acting on the concave portions can be more appropriately prevented.

According to the roll joining structure of the present invention, for example, when a concave portion is provided in each of the two rolls, each joining end side of the two rolls is fitted into the inner tube, and the two rolls are joined. And the outer peripheral surface of the inner pipe main body is brought into contact with the axial surface of the concave portion of the two rolls and the axial surface of the convex portion of the inner pipe. Then, the inner pipe does not move in any of the axial directions.

In this case, the inner peripheral surface of the concave portion of the two rolls is brought into contact with the outer peripheral surface of the convex portion of the inner tube, and the thickness of the portion provided with the concave portion is determined by the thickness of the convex portion of the inner tube. If the thickness is larger than the thickness, even if stress is concentrated on the concave portion, cracks are not easily generated. Furthermore, it is preferable to provide a plurality of bond grooves for holding an adhesive such as an applied bond on the outer peripheral surface of the inner tube main body, for example, along the outer periphery.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a roll joining structure according to a preferred embodiment of the present invention. FIG. 1 shows a roll joining structure 10 according to an embodiment of the present invention. The roll joining structure 10 includes a first roll 11 and a second roll 12, which are two rolls, and an inner tube 14.

The first and second rolls 11 and 12 are made of CFRP
And a concave portion 13 is formed on the inner peripheral surface of the end on the side to be joined. The first roll 11 and the second roll 12 are formed by setting the outer diameter, the inner diameter, and the inner diameter of each recess 13 to the same size.

The inner tube 14 is formed by using CFRP, and includes an inner tube main body 14a, a groove 14b, and a projection 14c. The inner tube main body 14a is formed in a cylindrical shape, and a plurality of grooves 14b are provided on the outer peripheral surface thereof along the outer periphery. A belt-like projection 14 extends along an outer peripheral surface at a substantially intermediate portion between one end and the other end of the inner pipe main body 14a.
c is provided.

As shown in FIG. 1, the first and second rolls 11 and 12 are axially fitted to the inner pipe 14, respectively.
They are joined with their central axes aligned. The inner pipe main body 14a of the inner pipe 14 is formed by setting its outer diameter slightly larger than the inner diameter of the first and second rolls 11 and 12.

Thus, the first and second rolls 11, 1
Each of the inner peripheral surfaces of the inner pipe 2 is the inner pipe main body 1 of the inner pipe 14.
4a, while being in pressure contact with the outer peripheral surface and also in close contact with the respective groove portions 14b, a strong frictional force is generated on the contact surface between the first and second rolls 11, 12 and the inner tube 14. Further, a part of the contact surface between the first and second rolls 11 and 12 and the inner tube 14 is adhered by an adhesive such as a bond.

The outer diameter of the convex portion 14c of the inner tube 14 is set to be substantially the same as the inner diameter of each concave portion 13 of the first and second rolls 11 and 12, and the first and second diameters are set. Each of the inner peripheral surfaces of the concave portions 13 of the rolls 11 and 12 is in a state of being in close contact with the outer peripheral surface of the convex portion 14c of the inner tube 14.

The thickness of the portion where the recess 13 is provided is about four-fifths of the thickness of the first and second rolls 11 and 12.
The convex portion 14c and the portion where the concave portion 13 is provided are formed with a thickness ratio of about 4: 1. This makes it difficult for cracks to occur even when stress concentrates on the corners of the recess 13.

Further, the axial length of the convex portion 14c of the inner tube 14 is set to the sum of the axial length of the concave portion 13 of the first roll 11 and the axial length of the concave portion 13 of the second roll 12. The axial end face of the joining end of the first roll 11 and the axial end face of the joining end of the second roll 12 are in close contact with each other.

The roll bonding structure 10 is formed as follows. First, the recess 13 provided at the end of the first roll 11 on the joining side is polished by polishing means (not shown). The outer peripheral surfaces of the inner pipe main body 14a and the projections 14c of the inner pipe 14 are polished by polishing means (not shown), and the inner pipe 1 is polished using a diamond tool (not shown).
4, a plurality of grooves 14b are formed.

Next, a bond is applied to the groove 14b formed at one end of the inner tube 14, and one end of the inner tube 14 is fitted in the joining side end of the first roll 11 in the axial direction. At this time, the inner tube 14 is pushed in until the axial end surface of the convex portion 14c on one end side of the inner tube 14 and the axial surface of the concave portion 13 of the first roll 11 abut.

Then, the inner peripheral surface of the first roll 11 comes into pressure contact with the outer peripheral surface of the inner pipe main body 14a, and also comes into close contact with the groove 14b due to the inherent elasticity of CFRP. Then, a portion that is in close contact with the groove 14b is in a state of being bonded by a bond. Next, the first and second rolls 11, 1
The end faces 11a and 12a in the axial direction at the ends on the joining side of No. 2 are polished by polishing means (not shown) to improve the right-angle accuracy. Subsequently, a bond is applied to the groove 14b formed on the other end of the inner tube 14.

Then, the second roll 1 is attached to the other end of the inner pipe 14.
2 is fitted in the axial direction. At this time, the axial end face 12a at the joining side end of the second roll 12 is
The second roll 12 is pushed in until it comes into contact with the axial end face 11a at the end on the joining side. Then, the inner peripheral surface of the second roll 12 comes into pressure contact with the outer peripheral surface of the inner pipe main body 14a, and also comes into close contact with the groove 14b. In addition, a portion in close contact with the groove 14b is in a state of being bonded by a bond. further,
The inner peripheral surface of the concave portion 13 of the second roll 12 and the outer peripheral surface on the other end side of the convex portion 14c come into close contact with each other.

Finally, the joined first and second rolls 1
When 1 and 12 are introduced into a heating furnace heated to 40 to 200 ° C., the bond is cured and the first and second rolls 11 and 1 are hardened.
2 and the inner tube 14 are properly bonded. According to such a roll bonding structure 10, the convex portion 14 c is provided substantially in the middle of the inner tube 14. For this reason, when fitting the second roll 12 and the inner tube 14, the one axial end surface of the one end side of the convex portion 14 c that comes into contact with the concave 13 axial surface of the first roll 11 serves as a stopper.

On the other hand, the first and second rolls 1
After the first and second rolls 1 and 12 are fitted, both axial end surfaces of the convex portion 14c abut against the concave 13 axial surfaces of the first and second rolls 11 and 12, respectively. Therefore, the inner pipe 14 does not move in any axial direction. Therefore, the inner pipe 14 maintains an appropriate arrangement position without shifting the arrangement position, and appropriately reinforces a joint portion between the first roll 11 and the second roll 12.

The recesses 13 of the first and second rolls 11 and 12 correspond to the recesses 13 of the first and second rolls 11 and 12, respectively.
The inner peripheral surface is brought into contact with the outer peripheral surface of the convex portion 14c, and the ratio of the thickness of the convex portion 14c to the thickness at the portion where each concave portion 13 is provided is set to about 4: 1. Therefore, the recess 13
Even when stress concentration occurs at the corners of the above, it is possible to appropriately prevent the occurrence of cracks by the interaction between the inner wall 14 and the thickness at the portion where the recess 13 is provided.

In order to obtain a long industrial roll having a desired axial length by adding two or more short rolls, both ends of the short roll formed between one end and the other end are used. A concave portion 13 is formed in the portion, and each short roll is
4 may be used for joining in the axial direction. Therefore, if such a roll joining structure 10 is used, it is possible to obtain an industrial roll having a desired axial length that is less likely to be damaged as compared with the related art.

The concave portion and the convex portion of the inner tube formed on the inner peripheral surface of the joining side end of the roll are used for positioning the inner tube when first inserting it into one roll and for displacing the inner tube in the axial direction. Since it functions particularly as prevention, it may be provided on one of the two rolls. Of course, it is preferable to be provided on both of the two rolls. When a concave portion is provided on both of the two rolls, it is necessary to form the concave portion and the convex portion with dimensions such that the axial end surface of the convex portion and the axial surface of each concave portion are in contact with each other.

Although the axial length of the concave portion provided on each roll can be set as appropriate, it is preferable to set the same axial length. If only one of the two rolls is provided with a concave portion, when the one axial end surface of the convex portion comes into contact with the inner axial surface of the concave portion of one roll, the other axial end surface of the convex portion becomes It is necessary to form the roll in such a dimensional relationship as to form a flat surface with the end face.

The shape, number and location of the projections are not limited, as long as the inner tube can be prevented from shifting in the axial direction. For example, it is preferable to provide one annular convex portion on the outer peripheral surface of the inner pipe main body, but a plurality of convex portions may be provided so that the radial cross section of the inner pipe main body has a convex gear shape. Further, it is preferable that the convex portion is provided, for example, at a substantially intermediate portion of the inner tube main body, since the inner tube is disposed substantially equally between the two rolls.

If the length of the convex portion in the axial direction is substantially the same as the length of the concave portion in the axial direction, when the two rolls are fitted into the inner tube, the shafts at the joining-side ends of the two rolls are fitted. This is preferable in that the end faces in the direction come into contact with each other. However, it is preferable that the ratio of the axial length of the projection to the axial length of the inner tube body is smaller. The components described above can be combined as much as possible.

Further, examples of the material of the two rolls include metals such as iron and aluminum, and synthetic resins.
It is preferable to use RP (carbon fiber reinforced plastic). The inner pipe main body constituting the inner pipe functions as a joint between two rolls, and has an outer diameter dimension substantially equal to, preferably slightly larger than, the inner diameter of the two rolls. It is preferable that the inner tube main body is formed so as to press the inner peripheral surfaces of the two rolls so as to be in contact with each other, since the center axes of the two rolls can be easily matched.

[0042]

As described above, according to the roll joining structure of the present invention, since the convex portion is formed substantially at the intermediate portion of the inner tube, the disposition of the inner tube is prevented from shifting. And cracks can be appropriately prevented from occurring. Further, the axial surface of the concave portion and the axial surface of the convex portion of the roll are brought into contact with each other, and the thickness of the portion where the concave portion is provided is formed larger than the thickness of the convex portion. It can be prevented more appropriately.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of a roll joining structure according to an embodiment of the present invention.

FIG. 2 is a partially cutaway view of a conventional roll joining structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roll joining structure 11 1st roll 12 2nd roll 13 Depression 14 Inner pipe 14a Inner pipe main body 14c Convex part

Claims (2)

[Claims] 1. A roll joining structure in which two rolls are joined in an axial direction by an inner tube, wherein a concave portion is provided on an inner peripheral surface of a joining side end of at least one of the rolls. From the joining side end of the roll, an inner pipe main body having an outer diameter substantially the same as the inner diameter of the two rolls, and a convex part having an axial length substantially the same as the axial length of the concave portion are connected to one end of the inner pipe main body. The inner tube formed between the other end is inserted until the axial surface of the concave portion comes into contact with the axial surface of the convex portion of the inner tube, and the other roll projects from one of the roll ends. A roll joining structure, wherein two rolls are joined by being fitted to the inner pipe main body of the inner pipe. 2. A thickness of a portion of the roll where the concave portion is provided is greater than a thickness of the convex portion of the inner tube, and the convex portion of the inner tube fits tightly into the concave portion. The roll joining structure according to claim 1, wherein: