JPH0639207U - Roll coupling device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a roll-coupling device that can reduce the time for changing rolls and prevent chatter marks. [Structure] A roll coupling device 10 transmits a driving torque to a roll 2 of a rolling mill. In this device,
An annular pressure chamber 111 is formed in the coupling outer cylinder portion 11 that receives the roll shaft end 31, a multi-sided liner 12 is mounted in the coupling outer cylinder portion 11, and a pressure medium is applied to the pressure chamber 11
1, the coupling outer cylinder portion 11 is elastically deformed in the radial direction, the liner 12 is padded, and the roll shaft end 31 is tightened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll-coupling device of a fitting and coupling type that transmits a driving torque to a roll of a rolling mill.

[0002]

[Prior art]

 Traditionally, the rolls of rolling mills are driven by a drive through a roll coupling. The roll has its shaft removably inserted into the coupling.

An example of a roll driving device of a conventional rolling mill is shown in FIGS. 5 and 6. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.

The conventional roll coupling 1 detachably receives the roll shaft 3 of the roll 2 of the rolling mill, and transmits the rotational torque of the motor 4 to the roll shaft 3 through the speed reducer 5 and the spindle 6. The roll 2 is rotatably supported by the roll chock 7.

A flat side wall 8 is formed in the bearing hole of the coupling 1 and serves as a torque transmission surface. The roll shaft 3 also has a flat surface 9 corresponding to the flat side wall 8. This is the torque transmission receiving surface.

When the roll shaft 3 is inserted into the hole of the coupling 1, as shown in FIG. 6, there is a clearance a between the flat surface 9 of the roll shaft 3 and the flat side wall 8 of the coupling 1. Is provided. This is to facilitate the attachment / detachment of the roll shaft 3 to / from the coupling 1. However, because of this play a, the rotation of the roll 2 fluctuates during rolling, causing defects called chatter marks in the rolled material.

The fit of the roll coupling varies depending on the type and size of the rolling mill, but the cold rolling mill has a clearance fit of about 0.1 to 0.3 mm. This play becomes even larger due to wear and the like caused by the roll attachment / detachment work, and chatter marks occur more frequently if the play exceeds 0.3-0.5 mm.

[0008] An example of a roll coupling in which a clearance a is provided when the roll shaft 3 is attached or detached and the clearance a can be eliminated during rolling is proposed in Japanese Utility Model Publication No. 58-157206. . This is because the roll coupling is provided with a hydraulic chamber to enable the above operation. In this case, there is a problem that the worker has to go to the drive side and operate the pressure oil in the hydraulic chamber every time when the roll is attached or detached, which causes a problem that roll change time increases and productivity of the rolling mill decreases. Occurs.

[0009] In addition to the above, there are those in which an expansion / contraction link mechanism is provided in the coupling (actual opening No. 3-51902), those in which a hydraulic cylinder unit is provided in the coupling (actual opening No. 3-9208) and the like. It is disclosed. However, these couplings are complicated in structure and have a high frequency of failures.

[0010]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to obtain a roll-coupling device that can shorten the time for changing rolls and prevent chatter marks from occurring.

[0011]

[Means for Solving the Problems]

 The roll / coupling device of the present invention is a fitting / coupling type roll / coupling device for transmitting a driving torque to a roll of a rolling mill, and an annular pressure chamber is formed in a coupling outer cylinder part for receiving a roll shaft end. Then, a polyhedral liner is mounted in the coupling outer cylinder part, a pressurizing medium is supplied to the pressure chamber, the coupling outer cylinder part is elastically deformed in the radial direction, and the liner is covered by The above problem is solved by means of tightening the roll shaft end.

[0012]

In the roll / coupling device of the present invention, the conventional play is provided at the time of inserting the roll shaft end into the coupling outer cylinder portion.

Before operating the rolling mill, a pressurizing medium is supplied from the outside into an annular pressure chamber provided in the coupling outer cylinder portion, the inner surface of the outer cylinder portion is expanded, and the roll shaft end is covered by covering the liner. tighten. Hold this state.

When the roll is exchanged, the pressurized medium in the pressure chamber is released to the outside, so that an initial play is generated in the coupling, and the roll shaft end can be easily extracted.

[0015]

【Example】

 An embodiment of the roll coupling device of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the roll-coupling device 10 of the present invention is attached to the tip of a spindle 6 connected to a motor 4 (FIG. 5), and is installed in a coupling outer cylinder portion 11. The roll shaft end 31 of the roll 2 is detachably received.

As shown in FIGS. 1 and 2, an annular pressure chamber 111 is formed in the coupling outer cylinder portion 11. A multi-sided liner 12 is mounted on the inner surface of the coupling outer cylinder portion 11. The bottom portion of the liner 12 is fixed to the central partition wall 112 of the coupling outer cylinder portion 11 with a bolt 13.

As shown in FIG. 3, the liner 12 has an inner surface formed into a multifaceted torque transmission surface such as a quadrangle (FIG. A) or a hexagon (B).

As shown in FIG. 2, the auto coupler 21 is attached to the cylinder 22 and can be moved up and down. The auto coupler 21 receives a pressurized medium (for example, pressurized oil or the like) from the pressurized medium source 30.

The pressurized medium source 30 is conventional and comprises a pump 31, solenoid valves 32, 33, and a pilot check valve 34.

The auto coupler 21 supplies a pressurizing medium to the pressure chamber 111 through a check valve 113 provided on the coupling outer cylinder 11. The pressurizing medium expands the outer casing of the coupling and presses the liner 12 against the roll shaft end 31 to eliminate play.

Even if the auto coupler 21 is separated from the check valve 113, the pressurized state of the pressure chamber 111 is maintained as it is due to the action of the check valve 113.

When exchanging the rolls, the auto coupler 21 may be operated to perform the operation opposite to the above.

FIG. 4 shows a limit transmission torque when the pressure chamber 111 of the coupling outer cylinder portion 11 is pressurized. The conditions of the coupling outer cylinder part 11 at this time are as follows.

Outer diameter 486 mm × inner diameter 330 mm × pressure chamber diameter 368 mm × initial clearance 0.32 mm, roll shaft end 300 mm.

As a result, a transmission torque of 8.2 ton · m was obtained at a pressure of the pressure chamber 111 of 450 kg · f / cm ² .

In the roll exchange work, the initial clearance of 0.32 mm was maintained.

[0028]

[Effect of device]

 According to the present invention, no chatter mark was observed even when the coupling was used for a long period of time. Also, the spindle replacement period can be extended. Further, the rolls can be easily and quickly changed.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a roll coupling device of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing various shapes of a roll end portion.

FIG. 4 is a graph showing the relationship between hydraulic chamber pressure and transmission torque.

FIG. 5 is a schematic configuration explanatory view of a conventional roll coupling device.

6 is a cross-sectional view taken along the line VI-VI of FIG.

[Explanation of symbols]

 10: Roll coupling device 11: Coupling outer cylinder part 111: Pressure chamber 12: Liner 13: Bolt 112: Central partition wall 21: Auto coupler 22: Cylinder 30: Pressurizing medium source

Claims (1)

[Scope of utility model registration request] 1. A fitting / coupling type roll / coupling device for transmitting a driving torque to a roll of a rolling mill, wherein an annular pressure chamber is formed in a coupling outer cylinder portion which receives a roll shaft end, It is possible to mount a polyhedral liner in the tubular portion, supply a pressure medium to the pressure chamber, elastically deform the coupling outer tubular portion in the radial direction, and tighten the roll shaft end by padding the liner. Characterized roll coupling device.