JPH0648905U - Drive shaft device for rolling mill - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a drive shaft device for a rolling mill, which does not cause buckling even in a long hydraulic cylinder. A supporting device 40 is swingably supported by a cylindrical body 10 by a first shaft, and swingably supports a hydraulic cylinder 20 by a second shaft in a direction intersecting the first shaft. Tip of piston rod 21 and spline shaft 3
One end of 0 is connected by a universal joint 50 having a convex spherical surface portion and a receiving portion with which the convex spherical surface portion rotatably abuts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rolling mill drive shaft device used for driving a rolling mill.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, as a drive shaft device for a rolling mill, as shown in FIG. 5, a cylinder 1 having a spline portion 1a provided on a part of an inner peripheral surface in the axial direction, and a cylinder 1 arranged in the cylinder 1, Some of them include a hydraulic cylinder 2 attached to a body 1 by a trunnion 4, and a spline shaft 3 which is arranged in the cylindrical body 1 and which engages with a spline portion 1a of the cylindrical body 1. The trunnion 4 swingably supports the hydraulic cylinder 2 along one plane perpendicular to the trunnion shaft 4a, and the tip of the piston rod 2A of the hydraulic cylinder 2 and one end of the spline shaft 3 are Trunnion A pin joint 5 having a pin 5a in the same direction as the shaft 4a is swingably connected along the above plane.

On the other hand, a motor (not shown) is connected to one end of the cylinder 1 by a joint 8, and a tip of the spline shaft 3 protruding from the cylinder 1 is connected to a roller of a rolling mill (not shown) by a joint 9. The rotational force of the motor is transmitted to the roller through the cylinder 1 and the spline shaft 3 that engages with the spline of the cylinder 1. Further, the piston rod 2A of the hydraulic cylinder 2 is projected and the roller of a rolling mill (not shown) is pressed by a predetermined force through the spline shaft 3.

During operation of the drive shaft device for a rolling mill, a gap between the spline shaft 1 and the spline portion 1 a provided on the inner circumference of the cylindrical body 1 causes the axis of the spline shaft 3 to move to the trunnion shaft. When it is displaced along the plane perpendicular to 4a, the trunnion 4 and the pin joint 5 cause the hydraulic cylinder 2 to oscillate within a predetermined angular range to absorb the displacement.

[0005]

[Problems to be solved by the device]

 By the way, in the conventional drive shaft device for a rolling mill, when the direction of the deviation between the axis of the hydraulic cylinder 2 and the axis of the spline shaft 3 is along a plane perpendicular to the trunnion shaft 4a, the trunnion is provided. The displacement can be absorbed by the swing of the hydraulic cylinder 2 around the shaft 4a and the swing of the pin joint 5, but if the shift direction is a direction intersecting the plane, the piston There is a problem that a bending moment is applied to the rod 2A. Particularly, when the piston rod 2A is long, there is a problem that the piston rod 2A is buckled due to this bending moment.

Therefore, an object of the present invention is to make a hydraulic cylinder swingable in two directions and to connect a tip of a piston rod and one end of a spline shaft so as to be swingable in at least two intersecting directions. Accordingly, it is an object of the present invention to provide a drive shaft device for a rolling mill in which bending moment is not applied to the hydraulic cylinder and buckling does not occur even in a long hydraulic cylinder.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a drive shaft device for a rolling mill according to claim 1 is provided with a tubular body having a spline on at least a part of an inner circumferential surface in the axial direction, and is disposed in the tubular body and attached to the tubular body. Equipped with a hydraulic cylinder and a spline shaft that is disposed inside the cylinder and that engages with the above-mentioned spline, and connects the tip of the piston rod of the hydraulic cylinder to one end of the spline shaft. The Eve shaft device is provided with a supporting member that is swingably supported by the cylindrical body by a first shaft and that swingably supports the hydraulic cylinder by a second shaft in a direction intersecting the first shaft. And a universal joint for supporting the tip of the piston rod and one end of the spline shaft so as to be swingable in at least two directions intersecting with each other. That.

According to a second aspect of the present invention, there is provided a drive shaft device for a rolling mill according to the drive shaft device for a rolling mill according to the first aspect, wherein the universal joint has a convex spherical surface portion and a convex spherical surface portion that are rotatable. It is characterized by having a receiving portion in contact with it.

[0009]

[Action]

 It is assumed that a gap between the spline of the cylinder and the spline shaft causes a deviation between the axis of the hydraulic cylinder and the axis of the spline shaft. In this case, the hydraulic cylinder can be swung in two directions with respect to the tubular body by the first shaft, the support member and the second shaft, and the tip of the piston rod and the tip of the spline shaft intersect with each other by a universal joint. Since it can swing in any direction, the tip of the piston rod does not receive a bending moment and follows the direction of displacement of the spline shaft. Therefore, even if the piston rod of the hydraulic cylinder is long, buckling is less likely to occur.

When the universal joint has a convex spherical surface portion and a receiving portion with which the convex spherical surface portion is rotatably abutted, the universal joint has one end of the spline shaft with respect to the tip of the piston rod. Allows swinging in all directions. Therefore, with a simple structure, it is possible to allow the displacement of the spline shaft in all directions without applying a bending moment to the hydraulic cylinder.

[0011]

【Example】

 Hereinafter, a drive shaft device for a rolling mill according to the present invention will be described in detail with reference to embodiments.

FIG. 1 is a sectional view of a drive shaft device for a rolling mill according to this embodiment, in which 10 is a cylinder, 20 is a hydraulic cylinder, 30 is a spline shaft, 40 is a supporting device, and 50 is a universal joint. 80 and 90 are joints. The tubular body 10 is formed by arranging tubular body members 11, 12 and 13 in the axial direction, and tightening and fastening each other in the axial direction with bolts. A spline portion 13a is provided on the inner circumference of a part of the cylindrical body 10 in the axial direction. The hydraulic cylinder 20 is arranged in the cylindrical body 10 and is supported by a support device 40 attached to a position where the cylindrical body members 11 and 12 are fixed. Ports 60, 70 are provided at both ends of the hydraulic cylinder 20 described above, and the ports 60, 70 project from the cylindrical body 10 to the outside. The spline shaft 30 is arranged in the cylindrical body 10 and is engaged with the spline portion 13 a of the cylindrical body 10. The shaft cover 14 which is attached to the tip of the spline shaft 30 and covers the tubular member 13 has a seal member provided between the inner periphery of the tip of the shaft cover 14 and the outer periphery of the tubular body 10. The gap between the cylindrical body 10 and the spline shaft 30, which is generated when the protrusion 30 is made, is sealed. A joint 80 is fixed to one end of the cylinder 10 on the side where the hydraulic cylinder 20 is arranged, and the joint 80 is connected to a motor (not shown). A joint 90 is fixed to the tip of the spline shaft 30, and a roller of a rolling mill (not shown) is connected to the joint 90.

As shown in FIG. 2, the supporting device 40 is arranged in an annular groove 10 b formed inside the cylindrical body 10. As shown in FIG. 3, the support device 40 includes a pair of brackets 42, 42 fixed to the cylindrical body 12 and having first shafts 42a, 42a arranged in a straight line therein, and the bracket 42. , 42 of the hydraulic cylinder 20 is swingably supported by the first shafts 42a, 42a of the hydraulic cylinder 20 in the direction of the arrow Y, and the hydraulic cylinder 20 is arranged in a rectangular hole provided in the center. The second shafts 22a, 22a include a support member 41 that supports the second shafts 22a and 22a so as to be swingable in the arrow X direction. The direction of the second shafts 22a, 22a and the direction of the first shafts 42a, 42a are orthogonal to each other. Therefore, the plane in the arrow Y direction, which is the swinging direction of the support member 41, and the plane in the arrow X direction, which is the swinging direction of the hydraulic cylinder 20 with respect to the support member 41, are orthogonal to each other. Therefore, the tip of the piston rod 21 of the hydraulic cylinder 20 can move in any direction of the inner circumference of the cylindrical body 10.

On the other hand, a universal joint 50 connecting the tip of the piston rod 21 of the hydraulic cylinder 20 and one end of the spline shaft 30 has a structure as shown in FIG. That is, a convex spherical surface portion 56 having a spherical tip is fixed to the tip of the spline shaft 30 with a bolt. On the other hand, to the tip fitting 51 fixed to the tip 21a of the piston rod 21 of the hydraulic cylinder 20, a flat plate-shaped receiving portion 55 having a larger diameter than the tip fitting 51 is fixed with a bolt, and the receiving portion 55 is provided with the above-mentioned. The convex spherical surface portion 56 is in contact. Further, a tubular member 53 having an engagement flange 53a that engages with the engagement flange 51a provided on the tip fitting 51 is fixed to the spline shaft 30 with a bolt, and the tip fitting 51 and the spline shaft 30, that is, the hydraulic pressure. The cylinder 20 and the spline shaft 30 are not separated. With respect to the inner circumference of the tubular member 53, a constant gap is provided between the outer circumference of the engagement flange 51a of the tip fitting 51, the outer circumference of the receiving portion 55, and the outer circumference of the tip fitting 51, so that the spline shaft 30 is attached to the tip fitting 51. Is able to swing. A rubber member 54 is provided between the engaging flange 51a of the tip fitting 51 and the receiving portion 55 to mitigate the impact generated by the collision between the tubular member 53 and the tip fitting 51 and the receiving portion 55.

According to the drive shaft device for a rolling mill having the above structure, the gap between the spline 1 a of the cylindrical body 1 and the spline shaft 30 causes the axial center of the hydraulic cylinder 20 and the axial center of the spline shaft 30 to be separated from each other. When there is a gap between them, the hydraulic cylinder 20 swings in the arrow Y direction with respect to the tubular body 10 by the first shafts 42a, 42a, and moves in the arrow X direction with respect to the support member 41 by the second shafts 22a, 22a. Rock to. Further, in the universal joint 50, since the convex spherical surface portion 56 is rotatably abutted on the receiving portion 55, the universal joint 50 allows one end of the spline shaft 30 to the tip of the piston rod 21 within a predetermined angle range. Can be swung in all directions. Therefore, the tip of the piston rod 21 can absorb the displacement of the spline shaft 30 in all directions without receiving a bending moment. Therefore, the hydraulic cylinder 20 is not subjected to bending moment, and therefore buckling is unlikely to occur even if it is long.

In the above-described embodiment, the universal joint 50 in which the flat receiving portion 55 on the tip end side of the piston rod 21 and the convex spherical surface portion 56 on the spline shaft 30 are used is used, but the tip end of the piston rod is used. A universal joint having a convex spherical surface on the side and a flat receiving portion on the spline shaft side may be used. Further, a universal joint may be used in which the receiving portion on the tip end side of the piston rod and the spline shaft side are convex spherical surfaces, and the convex spherical surfaces are in contact with each other. The universal joint may be a cross pin type universal joint.

[0017]

[Effect of device]

 As is clear from the above, the drive shaft device for a rolling mill of the present invention is swingably supported by the cylinder on the first shaft, and the hydraulic cylinder is swingable by the second shaft in the direction intersecting the first shaft. On the other hand, a universal joint for connecting the front end of the piston rod and one end of the spline shaft so as to be swingable in at least two directions intersecting at least is provided. When the gap between the spline of the cylinder and the spline shaft causes a deviation between the axis of the hydraulic cylinder and the center of the spline shaft, the cylinder is supported by the first shaft and the support on the cylinder. The member and the second shaft can swing in two directions. Furthermore, since the tip of the piston rod and the tip of the spline shaft can be swung in two intersecting directions by a universal joint, the tip of the piston rod follows the direction of displacement of the spline shaft without receiving a bending moment. . Therefore, the piston rod of the hydraulic cylinder is less likely to buckle even if it is long.

In the case where the universal joint has a convex spherical surface portion and a receiving portion with which the convex spherical surface portion rotatably abuts, the universal joint has one end of the spline shaft with respect to the tip of the piston rod. Can be allowed to swing in all directions. Therefore, with a simple structure, it is possible to realize a drive shaft device for a rolling mill that allows deviation of the axis of the spline shaft in all directions without applying a bending moment to the hydraulic cylinder.

[Brief description of drawings]

FIG. 1 is a sectional view of a drive shaft device for a rolling mill according to an embodiment of the present invention.

FIG. 2 is a sectional view of a portion where a supporting device of the drive shaft device for a rolling mill is arranged.

FIG. 3 is an end view taken along the line III-III in FIG.

FIG. 4 is a sectional view of a connecting portion between a piston rod and a spline shaft of the drive shaft device for a rolling mill.

FIG. 5 is a sectional view of a conventional drive shaft device for a rolling mill.

[Explanation of symbols]

10 ... Cylindrical body, 20 ... Hydraulic cylinder, 21 ... Piston rod, 30 ... Spline shaft, 40 ... Supporting device, 50
… Universal joints, 80, 90… Joints.

Claims (2)

[Scope of utility model registration request] 1. A cylindrical body having a spline on at least a part of an inner peripheral surface in the axial direction, a hydraulic cylinder mounted on the cylindrical body, and a hydraulic cylinder mounted on the cylindrical body, and arranged in the cylindrical body, A drive shaft device for a rolling mill, comprising: a spline shaft that engages with the spline; and connecting a tip of a piston rod of the hydraulic cylinder and one end of the spline shaft, wherein the cylinder body is swingable by a first shaft. And a support member that swingably supports the hydraulic cylinder by a second shaft in a direction intersecting the first shaft, while at least intersecting the tip of the piston rod with one end of the spline shaft. A drive shaft device for a rolling mill, comprising a universal joint that is swingably connected in a predetermined direction. 2. The drive shaft device for a rolling mill according to claim 1, wherein the universal joint has a convex spherical surface portion and a receiving portion with which the convex spherical surface portion rotatably abuts. Drive shaft device.