JP2593759Y2 - Drive shaft device for rolling mill - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive shaft device for a rolling mill used for driving a rolling mill.

[0002]

2. Description of the Related Art Conventionally, as a drive shaft device for a rolling mill, as shown in FIG. 5, a cylindrical body 1 provided with a spline portion 1a in a part of an inner peripheral surface in an axial direction, and Some are provided with a hydraulic cylinder 2 arranged and attached to the cylinder 1 by a trunnion 4, and a spline shaft 3 arranged in the cylinder 1 and engaging with a spline portion 1 a of the cylinder 1. . The trunnion 4 is provided with a 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 swung along the plane by a pin joint 5 having a pin 5a in the same direction as the trunnion shaft 4a. It is movably connected.

On the other hand, a motor (not shown) is connected to one end of the cylindrical body 1 by a joint 8, and a tip of the spline shaft 3 protruding from the cylindrical body 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 via the cylinder 1 and a spline shaft 3 which engages with a spline of the cylinder 1. Further, the piston rod 2A of the hydraulic cylinder 2 is made to protrude so as to press a roller of a rolling mill (not shown) with a predetermined force via the spline shaft 3.

During operation of the drive shaft device for a rolling mill, a spline portion 1 provided on the inner periphery of the cylindrical body 1 is provided.
When the axis of the spline shaft 3 is displaced along the plane perpendicular to the trunnion shaft 4a due to a gap between the trunnion 4 and the trunnion 4
And the pin joint 5, the hydraulic cylinder 2 swings within a predetermined angle range to absorb the deviation.

[0005]

In the conventional drive shaft device for a rolling mill, the direction of displacement between the axis of the hydraulic cylinder 2 and the axis of the spline shaft 3 is a plane perpendicular to the trunnion shaft 4a. In this case, the displacement can be absorbed by the swing of the hydraulic cylinder 2 about the trunnion shaft 4a and the swing of the pin joint 5, but the direction of the displacement intersects the plane. In this case, there is a problem that a bending moment is applied to the piston rod 2A. In particular, when the piston rod 2A is long, there is a problem that the bending moment causes the piston rod 2A to buckle.

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

[0007]

According to a first aspect of the present invention, there is provided a drive shaft device for a rolling mill, comprising: a cylindrical body having a spline at least partially in an axial direction of an inner peripheral surface; And a hydraulic cylinder attached to the cylindrical body, and a spline shaft arranged in the cylindrical body and engaging with the spline, the tip of a piston rod of the hydraulic cylinder and one end of the spline shaft. In the drive shaft device for a rolling mill, the first cylinder is swingably supported by the first shaft, and the hydraulic cylinder is swingably supported by the second shaft in a direction intersecting the first shaft. A universal joint that includes a member and supports a tip of the piston rod and one end of the spline shaft so as to be swingable in at least two directions crossing each other. It is characterized in that was example.

According to a second aspect of the present invention, in the drive shaft device for a rolling mill, the universal joint abuts a convex spherical portion and the convex spherical portion rotatably abuts. And a receiving portion.

[0009]

It is assumed that the gap between the spline of the cylindrical body and the spline shaft causes a displacement between the axis of the hydraulic cylinder and the axis of the spline shaft. At this time, the hydraulic cylinder can swing in two directions with respect to the cylindrical body by the first shaft, the support member, and the second shaft, and furthermore, the tip of the piston rod and the tip of the spline shaft intersect by the universal joint in two directions. Therefore, the tip of the piston rod follows the direction of displacement of the spline shaft without receiving a bending moment. Therefore, even if the piston rod of the hydraulic cylinder is long, buckling hardly occurs.

When the universal joint has a convex spherical portion and a receiving portion with which the convex spherical portion abuts rotatably, 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, the spline shaft can be allowed to shift in all directions without applying a bending moment to the hydraulic cylinder with a simple structure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drive shaft device for a rolling mill according to the present invention will be described in detail below 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 support device, 50 is a universal joint, 80 , 90 are joints. The cylindrical body 10 is formed by arranging cylindrical members 11, 12, and 13 in the axial direction, and fastening the cylindrical members 11, 12, and 13 to each other in the axial direction with bolts. A spline portion 13a is provided on a part of the inner periphery of the cylindrical body 10 in the axial direction. The hydraulic cylinder 20 is disposed in the cylinder 10 and is supported by a support device 40 attached to a position where the cylinder members 11 and 12 are fixed. Ports 60 and 70 are provided at both ends of the hydraulic cylinder 20, and the ports 60 and 70 are
It protrudes from 0 to the outside. The above spline shaft 3
Numeral 0 is disposed in the cylindrical body 10 and is engaged with the spline portion 13a of the cylindrical body 10. The shaft cover 14, which is attached to the tip of the spline shaft 30 and covers the cylindrical body member 13, has the spline shaft 30 protruded by a seal member provided between the inner periphery of the distal end of the shaft cover 14 and the outer periphery of the cylindrical body 10. The gap between the cylindrical body 10 and the spline shaft 30 that occurs when sealing is performed is sealed. Also,
A joint 80 is fixed to one end of the cylinder 10 on the side where the hydraulic cylinder 20 is disposed, 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 support device 40 is disposed in an annular groove 10b formed inside the cylindrical body 10. The support device 40 is, as shown in FIG.
And the first shafts 42a, 42 arranged on a straight line.
a, a pair of brackets 42, 42 having the inner side a and a first shaft 42a, 42a of the brackets 42, 42 are supported swingably in the direction of the arrow Y, and a hydraulic cylinder is provided in a rectangular hole provided at the center. And a support member 41 that supports the second shafts 22a, 22a, which are trunnion shafts of the hydraulic cylinder 20, so as to be swingable in the direction of arrow X. The direction of the second shafts 22a, 22a and the first shafts 42a,
The direction is orthogonal to the direction of 42a. Therefore, the plane in the direction of arrow Y, which is the swing direction of the support member 41, and the plane in the direction of arrow X, which is the direction of swing 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 is
Can move in any direction on the inner circumference of the vehicle.

On the other hand, a universal joint 50 for 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 portion 56 having a spherical tip is fixed to the tip of the spline shaft 30 with a bolt. on the other hand,
Tip 21 of piston rod 21 of hydraulic cylinder 20
a, a flat receiving member 55 having a diameter larger than that of the front metal fitting 51 is fixed to the front metal fitting 51 with a bolt.
5 is in contact with the convex spherical portion 56. Further, a cylindrical member 53 having an engaging flange 53a for engaging with an engaging flange 51a provided on the tip metal fitting 51 is fixed to the spline shaft 30 by a bolt, and the tip metal fitting 51 and the spline shaft 30, that is, the hydraulic cylinder 20 and the spline shaft 30 are not separated. The outer periphery of the engaging flange 51a of the tip fitting 51, the outer periphery of the receiving portion 55, and the outer periphery of the tip fitting 51 are provided with a certain gap with respect to the inner periphery of the cylindrical member 53, and the spline shaft 30 is provided with respect to the tip fitting 51. Can swing. The engagement flange 51a of the tip metal fitting 51 and the receiving portion 55
A rubber member 54 is provided between them to reduce the shock generated by the collision between the cylindrical member 53 and the tip metal fitting 51 and the receiving portion 55.

According to the drive shaft device for a rolling mill having the above configuration, the hydraulic cylinder 20 is provided by the gap between the spline 1a of the cylindrical body 1 and the spline shaft 30.
When the displacement between the axis of the spline shaft 30 and the axis of the spline shaft 30 occurs, the hydraulic cylinder 20
It swings in the arrow Y direction by the shafts 42a, 42a, and swings in the arrow X direction by the second shafts 22a, 22a with respect to the support member 41. Further, in the universal joint 50, the convex spherical portion 56 is rotatably abutted on the receiving portion 55, so that the universal joint 50 can move one end of the spline shaft 30 with respect to the tip of the piston rod 21 over a predetermined angle range. Can swing in any direction. 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 does not receive a bending moment, and therefore does not easily buckle even if it is long.

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

[0017]

As is apparent from the above description, the drive shaft device for a rolling mill according to the present invention is supported by a cylinder so as to be swingable by a first shaft, and a hydraulic cylinder is driven by a second shaft in a direction intersecting the first shaft. The apparatus includes a support member that is swingably supported by a shaft, and a universal joint that connects the tip of the piston rod and one end of the spline shaft to be swingable in at least two directions crossing each other. When the gap between the spline of the cylinder and the spline shaft causes a displacement between the axis of the hydraulic cylinder and the axis of the spline shaft, the hydraulic cylinder is moved relative to the cylinder by the first shaft,
The support member and the second shaft can swing in two directions. Further, since the tip of the piston rod and the tip of the spline shaft can swing in two directions intersecting by the universal joint, the tip of the piston rod follows the direction of displacement of the spline shaft without receiving a bending moment. Therefore, even if the piston rod of the hydraulic cylinder is long, buckling hardly occurs.

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

[Brief description of the 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 support device of the drive shaft device for a rolling mill is arranged.

FIG. 3 is an end view seen from line III-III in FIG. 2;

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]

DESCRIPTION OF SYMBOLS 10 ... Cylinder, 20 ... Hydraulic cylinder, 21 ... Piston rod, 30 ... Spline shaft, 40 ... Support device, 50
... universal joints, 80, 90 ... joints.

Claims (2)

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