JPH0716623A - Spindle coupling device for driving rolling mill - Google Patents

Abstract

PURPOSE:To provide a spindle coupling device for driving a rolling mill. CONSTITUTION:This is the spindle coupling device for driving the rolling mill consisting of a york 8 having a recessed part 8a which can freely attach and detach the axial part 1a of a work roll and liners 9 fixing the side end face of the axial part 1a and the recessed part 8a. A hydraulic source cylinder 13 actuating the end face of the axial part 1a of the work roll through pressure, a pilot check valve 14 connected with this hydraulic pressure source cylinder 13 through a hydraulic duct 15, a liner moving cylinder 11 which can move the liners 9 freely through spring bodies 12 and a hydraulic duct 16 connecting this liner moving cylinder 11 with the pilot check valve 14 are integrated into the recessed part 8a of the york 8. In this way, the liners 9 can be expanded and contracted freely, the play of the work roll is removed, further, the work roll is attached and detached easily.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a conventional rolling mill, as shown in FIG. 4, a work roll 1 is mounted in a housing 3 via a roll chock 2 and a rotational torque of a drive motor 4 is connected to a speed reducer 5 in a spindle. It is configured to be transmitted to the work roll 1 via 6 and its spindle coupling device 7.

The spindle coupling device 7 includes
As shown in FIGS. 5 (a) and 5 (b), the shaft 8a of the work roll 1 having an oval outer shape is mounted in the yoke 8 so that the torque can be transmitted. Is provided. Then, in order to facilitate the attachment / detachment of the work roll 1 in response to frequent replacement, a gap S (= B− is usually provided between the width A of the shaft portion 1a of the work roll 1 and the width B of the recess 8a. A, usually about 0.5 mm) is provided. Note that the liner 9 is driven into the gap S to be fixed, thereby suppressing the occurrence of backlash with the shaft portion 1a.

[0004]

However, in the conventional spindle coupling device 7 as described above, when the liner 9 is worn, the gap S between the shaft portion 1a of the work roll 1 and the concave portion 8a of the yoke 8 is reduced. When the work roll 1 becomes large, the rotation of the work roll 1 occurs. Then, there is a problem in that the vibration affects the rolled material and causes a quality defect called a so-called chatter mark. Also, the gap S is 0.5 mm
Since the size is small, it hinders the insertion / extraction of the work roll 1, and therefore it is necessary to strictly manage the position.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling mill driving spindle coupling device which solves the above-mentioned problems of the prior art.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a drive for a rolling mill comprising a yoke having a recess for allowing the shaft of a work roll to be detachably mounted, and a liner for fixing the side end surface of the shaft and the recess. A spindle coupling device used for a hydraulic pressure source cylinder, which is operated by a pushing force of an end face of a shaft portion of the work roll, and is connected to the hydraulic pressure source cylinder via a hydraulic line. A pilot check valve, a liner moving cylinder that allows the liner to move via a spring body, and a hydraulic line that connects the liner moving cylinder and the pilot check valve are incorporated. It is a machine drive spindle coupling device.

[0007]

[Operation] According to the present invention, the hydraulic cylinder and the spring incorporated in the yoke are utilized by utilizing the contact state difference between the end surface of the shaft portion and the end surface of the recess of the spindle coupling / yoke when the work roll is inserted / removed. The liner is expanded / contracted by operating, and it is always pinched when the work roll is inserted and opened when the work roll is pulled out. In addition, the work roll can be easily inserted by increasing the gap when the work roll is pulled out.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing a partial cross-section of an embodiment of a spindle coupling device of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA. In the figure, reference numeral 11 denotes a liner moving cylinder, which is attached to four liners 9 provided corresponding to the side end surface of the shaft portion 1a of the work roll 1 via spring bodies 12. Reference numeral 13 is a hydraulic pressure source cylinder that is operated by the pushing force of the shaft portion 1a of the work roll 1, and fills the amount of oil with the piston at the stroke end. Reference numeral 14 is a pilot check valve connected by a hydraulic line 15, and 16 is a hydraulic line for transmitting the hydraulic pressure from the pilot check valve 14 to each liner moving cylinder 11.

The work roll 1 is placed in the concave portion 8a of the yoke 8 of the spindle coupling device 7A constructed as described above.
3, the piston rod 13a of the hydraulic pressure source cylinder 13 is first pushed to move the piston to the stroke end on the opposite side, as shown in FIG. Then, the pressure oil in the hydraulic source cylinder 13 is sent from the hydraulic line 15 to the liner moving cylinders 11 via the pilot check valve 14 and the hydraulic line 16. As a result, each liner 9 moves in the direction of the arrow, that is, in the direction of the center of the yoke 8 and presses the side end surface of the shaft portion 1a of the work roll 1, so that the clearance between the side end surface of the shaft portion 1a and the liner 9 is zero. be able to.

Further, when the shaft portion 1a of the work roll 1 is pulled out from the yoke 8, the pushing force to the hydraulic source cylinder 13 disappears by merely pulling back the shaft portion 1a, and the hydraulic pipeline 15 and the hydraulic pipeline 16 are separated from each other. The pilot check valve 14 opens due to the pressure difference, which causes the piston rod 13a of the hydraulic source cylinder 13 to
Moves in the opposite direction and returns to the original stroke end position. At this time, the liner 9 is moved to the yoke 8 by the force of the spring body 12.
Since it operates in the direction opposite to the center direction of the work roll 1 and returns to the state before the work roll 1 is inserted, a large gap can be secured between the work roll 1 and the side end surface of the shaft portion 1a.

Spindle coupling device 7A of the present invention
Was applied to the rolling mill. At this time, the hydraulic source cylinder 13 used had a stroke amount of 10 mm. When the diameter of the liner 9 before the shaft portion 1a of the work roll 1 is inserted is 10 mm wider than the diameter of the shaft portion 1a, the stroke is set to 0 mm.
It was set so that a pushing force of 5 mm would be obtained with a being inserted. As a result, when the work roll was inserted and removed, it operated smoothly, and during the rotation of the work roll 1, there was no rattling and it operated well.

[0012]

As described above, according to the spindle coupling device of the present invention, the liner can be expanded and contracted so that it is always pinched when the work roll is inserted and opened when the work roll is pulled out. It is possible to prevent the backlash of the work roll due to the influence of the wear amount,
This makes it possible to eliminate product quality defects. Further, it is not necessary to align the work rolls when they are attached and detached, and the work load can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing, in a partial cross section, an embodiment of a spindle coupling device of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a system diagram showing a hydraulic circuit of the spindle coupling device of the present invention.

FIG. 4 is a schematic diagram showing a drive device for a conventional rolling mill.

FIG. 5 shows a conventional spindle coupling device (a).
It is a side view, (b) It is the BB arrow line view.

[Explanation of symbols]

 1 Work Roll 1a Shaft 6 Spindle 7A Spindle Coupling Device 8 Yoke 8a Recess 9 Liner 11 Liner Moving Cylinder 12 Spring Body 13 Hydraulic Source Cylinder 14 Pilot Check Valve 15, 16 Hydraulic Pipeline

Claims (1)

[Claims] 1. A spindle coupling device used for driving a rolling mill, comprising: a yoke having a recess for allowing a shaft portion of a work roll to be detachably mounted; and a liner for fixing a side end surface of the shaft portion and the recess. In the concave portion of the yoke, a hydraulic pressure source cylinder that is actuated by the pushing force of the end surface of the shaft portion of the work roll, a pilot check valve connected to the hydraulic pressure source cylinder via a hydraulic pressure line, and the liner A spindle coupling device for driving a rolling mill, comprising: a liner moving cylinder that is movable via a spring body; and a hydraulic pipe line that connects the liner moving cylinder and the pilot check valve.