JPH0110091Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an improvement of a sealing device for a rolling mill drive device.

<Prior Art> Generally, a driving device for a rolling mill is configured to transmit torque by fitting the inner diameter of a spindle coupling at the end of the shaft into a roll neck of a rolling roll.

The fit between the spindle coupler and the roll neck is configured to have a fairly loose fit for the purpose of assembling the roll, and as a result, rubbing movements of the spindle couple occur during rotation, resulting in metal contact on the fit surface. This causes severe wear. Therefore, in order to minimize the wear of the mating surfaces due to this metal contact, it is necessary to supply sufficient lubricating oil between the mating surfaces of the coupling and roll neck.

<Problem to be Solved> However, since a large amount of cooling water is used especially during rolling in a hot rolling mill, the cooling water and scale may flow through the gap between the end face of the spindle coupling and the roll. The lubricating oil enters the gap between the coupling and the roll neck, washes out the lubricating oil in the area, causes metal contact on the fitting surface and accelerates wear, and causes pollution problems and problems during rolling due to the leaked lubricating oil. There was a problem in that the increased vibration adversely affected rolling accuracy.

<Means for Solving the Problems> This invention attempts to solve the above problems by configuring a sealing device for a rolling mill drive device as described below.

That is, a ring member fixed to the outer peripheral surface of the shoulder of a roll neck of a rolling mill, a bearing tightening nut screwed onto the outer peripheral surface of the ring member, a spindle coupling fitted to the roll neck, and the spindle. A sealing member installed between the end face of the coupling ring and the bearing tightening nut and slidingly contacting the end face of the spindle coupling and the outer peripheral surface of the shoulder of the roll neck, and between the sealing member and the bearing tightening nut. and a pressing mechanism arranged at several locations around the circumference to press the sealing member against the end face of the spindle coupling, the pressing mechanism comprising a rod slidably attached to the bearing tightening nut in the axial direction. , an elastic body inserted into the rod and disposed between the rod tip and the bearing tightening nut, and constantly pressing the sealing member against the end face of the spindle coupling via the rod tip. The configuration of the sealing device of the rolling mill drive device shall be as follows.

<Function> With the above configuration, even if the gap between the roll and the spindle coupling changes due to axial movement of the roll during rolling or axial movement due to change in the pass line, the rod and the elastic body Since the pressing mechanism constantly presses the sealing member in the axial direction, the sealing member can be made to follow changes in the gap while being in sliding contact with the end surface of the coupling ring.

Therefore, the sealing member is always maintained in sliding contact with the end face of the spindle coupling and the shoulder of the roll neck, and there is no possibility that cooling water or scale may enter from the outside into the mating surface between the coupling and the roll neck.

<Example> An example of the present invention will be described based on FIGS. 1 to 3.

3 is a spindle coupling into which the roll neck 2 is fitted, and has an appropriate fit gap S1 between its inner diameter and the outer diameter of the roll neck 2;
It is connected to a drive shaft (not shown) via two sets of universal joints (not shown), and transmits drive torque to the rolling roll 1 . The roll neck 2 has an oval cross-sectional shape as shown by the imaginary line in FIG. It has the same oval cross-sectional shape as the roll neck 2.

A two-split ring member 6 (hereinafter referred to as a half ring) is attached and fixed to the circumferential groove 4 formed on the outer circumferential surface of the shoulder portion 5 of the roll neck 2, and a bearing is attached to the threaded portion formed on the outer circumferential surface of the half ring 6. Screw on the tightening nut 7.

The roll support bearing 12 is tightened and fixed by this bearing tightening nut 7.

Reference numeral 8 denotes a sealing member disposed between the bearing tightening nut 7 and the end surface 3a of the spindle coupling 3, which is a felt sheet in the embodiment, and is arranged between the end surface 3a of the coupling and the outer periphery of the shoulder 5 of the roll neck. It is in constant sliding contact with the surface and seals the gap between the coupling and the roll.

The felt seal 8 may be brought into direct sliding contact with the end surface 3a of the coupling, but as shown in FIG. The felt seal 8 is placed inside the stepped portion 13 to seal the stepped portion 13.
The radial end face 14 of the roll neck and the shoulder 5 of the roll neck
If the outer peripheral surface of the felt seal 8 is in sliding contact with the outer peripheral surface of the felt seal 8, it becomes compact, and even if the outer end portion 3c of the coupling ring 3 opens toward the outer diameter side when the coupling ring 3 is loaded, the influence of this is reduced by the sliding contact portion of the felt seal 8. It is possible to prevent this from happening.

9 is a cross-sectional core bar attached to the felt seal 8.

Further, recesses 7a and 7b are formed at several locations around the circumference on both sides of the bearing tightening nut 7 in corresponding positions, and a through hole 7c is provided which communicates between the recesses. The other end of the rod 10 having the head 10a at one end is inserted into one of the recesses 7 in the through hole 7c.
A spring 11 is inserted into the other end of the rod 10 so as to be slidable in the axial direction toward the felt seal 8 from the side a, and acts in a direction to separate the rod 10 and the nut 7 in the axial direction. The rod is inserted through the rod and disposed between the tip flange portion 10b provided on the other end side and the bottom surface of the other recessed portion 7b of the nut 7.

As a result, the tip flange portion 10b of the rod is pressed against the core metal 9 by the spring force, and the felt seal 8 is always attached to the end surface 3a of the coupling or the radial end surface 14 of the step portion 13 having a roughly cross-sectional shape formed on the end surface of the coupling. Press. That is, the rod 10 and the spring 11 are connected to the felt seal 8.
It is configured as a pressing mechanism for pressing the spindle coupling 3 against the spindle coupling 3. In the case of the embodiment, the head 10a of the rod is located in one of the recesses 7a of the nut 7.
A gap S2 is provided between the bottom surface of the recess 7a and the inner bottom surface of the head 10a of the rod, which is approximately equivalent to or slightly larger than the amount of axial movement of the roll 1.

Reference numeral 15 denotes a spiral groove formed in the arcuate surface 3d of the roll neck fitting hole 3b with an oval cross section of the spindle coupler 3. During rolling, the lubricating oil supplied to the gap between the spindle coupler 3 and the roll neck 2 is inserted into the fit hole. This is to ensure that it is widely supplied over the entire surface.

<Effects> With the above configuration, even if the gap between the roll and spindle coupling changes due to axial movement of the roll during rolling or axial movement due to change in the pass line, the pressing force formed by the rod and spring can be maintained. Since the mechanism constantly presses the sealing member in the axial direction, the sealing member can follow changes in the clearance while being in sliding contact with the end face of the coupling.

Therefore, the sealing member is always maintained in sliding contact with the end face of the spindle coupling and the shoulder of the roll neck, and there is no possibility that cooling water or scale may enter from the outside into the mating surface between the coupling and the roll neck.

As a result, inconveniences such as the lubricating oil supplied to the fitting surface being washed out can be prevented, wear of the fitting surface is prevented as much as possible, and pollution problems caused by the lubricating oil can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of this invention, FIG. 2 is a cross-sectional view of the spindle coupling taken along the - line in FIG. 1, and FIG. 3 is an enlarged view of the pressing mechanism of the seal member. 2... Roll neck, 3... Spindle coupling, 5... Shoulder, 6... Ring member, 7...
Bearing tightening nut, 8... Seal member, 10...
Rod, 11...spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A ring member fixed to the outer peripheral surface of the shoulder of a roll neck of a rolling mill, a bearing tightening nut screwed onto the outer peripheral surface of the ring member, and a nut fitted to the roll neck. a sealing member installed between the end face of the spindle coupling and the bearing tightening nut and slidingly contacting the end face of the spindle coupling and the outer peripheral surface of the shoulder of the roll neck; and the sealing member. and the bearing tightening nut at several locations around the circumference, the pressing mechanism presses the sealing member against the end face of the spindle coupling, and the pressing mechanism presses the bearing tightening nut in the axial direction. A slidably mounted rod, which is inserted through the rod and placed between the rod tip and the bearing tightening nut, and constantly presses the sealing member against the end face of the spindle coupling via the rod tip. 1. A sealing device for a rolling mill drive device, comprising an elastic body. (2) Scope of the Utility Model Registration Claim 1, wherein a stepped portion having a roughly shaped cross section is formed on the inner diameter portion of the end surface of the spindle coupling, and the sealing member is brought into sliding contact with the radial side end surface of the stepped portion. A sealing device for a rolling mill drive device according to. (3) The sealing device for a rolling mill drive device according to claim 1, wherein the sealing member is a felt seal.