JP2000130430A - Working roll of rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a coupler of a working roll of a rolling mill from water droplets and dust floating around the rolling mill by arranging a dust seal between a drive shaft of a driving device to drive the working roll and the working roll. SOLUTION: A lip part make contact with end surfaces of couplers 50a, 50b while it further opens and a space between drive shafts 52a, 52b to rotationally drive a working roll, more in detail, a space between roll shafts 28a, 32a and the couplers 50a, 50b is blocked from outside when fitting projections 28b, 32b are fitted to fitting holes 56a, 56b of the couplers 50a, 50b after a dust seal 10 is fixed on head end parts of the roll shafts 28a, 32a on the driving side of the working roll. Consequently, it is possible to prevent intrusion of water droplets and dust floating in the circumference of a rolling mill in the couplers 50a, 50b, more in detail, between the fitting projections 28b, 32b and the fitting holes 56a, 56b and to prevent deterioration and outflow of grease between the fitting projections 28b, 32b and the fitting holes 56a, 56b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work roll of a rolling mill, and more particularly to a work roll provided with a dust seal between the work roll and a driving shaft of a driving device for driving the work roll.

[0002]

2. Description of the Related Art The work roll of a rolling mill is connected to a drive shaft of a driving device via a joint. However, conventionally, this joint has not been protected from water drops and dust floating around the rolling mill.

[0003]

Therefore, water droplets and dust floating around the rolling mill enter the joints of the work rolls, deteriorating the grease sealed in the joints, and causing the grease to flow out of the joints. There is a problem of running out of greasing.

An object of the present invention is to solve such a problem of the prior art, and it is an object of the present invention to protect a joint of a work roll of a rolling mill from water droplets and dust floating around the rolling mill.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a work roll of a rolling mill in which a dust seal is provided between a drive shaft of a driving device for driving the work roll and the work roll. Make the role a gist.

Preferably, the dust seal includes a cylindrical portion attached to one end of the work roll, and a lip portion abutting on an end of the drive shaft. Preferably,
The lip portion of the dust seal expands in a truncated cone shape having a center angle of about 60 ° to 140 ° from the work roll side to the joint side.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Referring first to FIG. 2, there is shown an example of a four-high rolling mill provided with a reduction device to which the present invention is applied. This rolling mill has a portal housing 20.
Upper and lower reinforcing rolls 24 and 36 and upper and lower work rolls 28 and 3
2 is upper and lower reinforcing roll chocks 22a, 22b, 34
a, 34b and upper and lower work roll chocks 26a, 26
It is rotatably supported via b, 30a and 30b. Upper and lower reinforcement roll chocks 22a, 22b, 34a,
34b and upper and lower work roll chocks 26a, 26b,
The upper and lower work rolls 28, 32 are supported movably in the vertical direction along the housing 20.
In order to apply a desired rolling load to the housing 20, a pressing-down device 1 is disposed above the housing 20.

The pressing device 1 includes pressing blocks 38a, 38
b, the screws 40a, 40b abutting on the upper reinforcing roll chocks 22a, 22b, and the reduction gears 44a,
It has a pair of drive motors 46a, 46b connected to the screws 40a, 40b via 44b. The drive motors 46a, 46b are connected to each other via shafts 40a, 40b. Housing 22a, 22b
Nuts 42a and 42b engaging with the screws 40a and 40b are fixed to the upper part of the
By rotating the screws 40a and 40b with the screws a and b, the screws 40a and 40b move up and down in the vertical direction, and the upper reinforcing roll chocks 22a and 22b are vertically positioned.

The work rolls 28 and 32 are independently driven to rotate by respective driving devices 54a and 54b. The driving devices 54a and 54b include an electric motor (not shown) and driving shafts 52a and 52b connected to an output shaft of the electric motor, as is well known. Drive shaft 52a,
52b is connected to the drive shafts 28a, 32a of the work rolls 28, 32 via joints 50a, 50b provided at the ends of the drive shafts 52a, 52b.

The joints 50a, 50b are connected to the work rolls 28,
A fitting hole 56a complementary to the fitting projections 28b, 32b provided at the tip of the roll shafts 28a, 32a on the drive side of 32,
56b. By fitting the fitting projections 28b, 32b into the fitting holes 56a, 56b, the work roll 2
8, 32 are connected to the drive shafts 52a, 52b. Grease for reducing friction between the fitting projections 28b, 32b and the fitting holes 56a, 56b is applied.

The roll shafts 28a of the work rolls 28, 32,
A dust seal 10 is attached to the drive-side tip of 32a so as to cover the periphery of the fitting protrusions 28b and 32b. As shown in FIG. 3, the dust seal 10 includes one end of the work rolls 28 and 32, more specifically, the work rolls 28 and 32.
The cylindrical portion 12 is mounted around the tip of the roll shafts 28a and 32a on the drive side of the cylinder 32, and the lip portion 14 extending from the end of the cylindrical portion 12 and abutting against the end surfaces of the joints 50a and 50b. The cylindrical portion 12 includes work rolls 28, 3
2 has an inner peripheral surface 12a in contact with the outer peripheral surfaces of the roll shafts 28a and 32a on the driving side, and a peripheral groove 16 formed in the outer peripheral surface. The circumferential groove 16 receives the fixed band 60 shown in FIG. The dust seal 10 is preferably integrally formed of a flexible material, for example, a synthetic rubber including nitrile rubber or a flexible resin.

The fixing band 60 is a known so-called quick fixing band, and includes a band-shaped band portion 62, a locking device 64,
And an engaging portion 66. The locking device 64 includes a locking lever 64a rotatably mounted on the outer peripheral surface of the band portion 62, a tension spring 64c connected to the locking lever 64a, and an engagement 66 connected to the tension spring 64c. And a hook 64b provided so as to be mateable. The lip portion 14 has a center angle α of about 60 ° from the work roll side to the joint side.
It expands into a frusto-conical shape at 140 ° from. The dust seal 10 is moved to the roll shaft 28 on the drive side of the work rolls 28 and 32.
a and 32a, the band portion 62 is wound along the circumferential groove 16, the hook 64b is engaged with the engagement portion 66, and the locking lever 64a is operated to operate the band portion 62a. , The dust seal 10 is fixed to the leading ends of the roll shafts 28a, 32a on the driving side of the work rolls 28, 32.

Referring to FIG. 4, after the dust seal 10 is fixed to the leading ends of the roll shafts 28a and 32a on the driving side of the work rolls 28 and 32 as described above, the fitting projection 2 is fixed.
8b, 32b are fitted into the fitting holes 56a, 5b of the joints 50a, 50b.
6b, the lip portion 14 abuts on the end faces of the joints 50a and 50b while further expanding, and the work roll 2
8, 32, and the drive shafts 52a, 52b for rotating the work rolls 28, 32, more specifically, the roll shaft 28
a, 32a and the joints 50a, 50b are shut off from the outside. This prevents water droplets and dust floating around the rolling mill from entering the joints 50a, 50b, more specifically, between the fitting projections 28b, 32b and the fitting holes 56a, 56b. The protrusions 28b, 32b and the fitting holes 56a,
The grease between 56b is prevented from deteriorating or flowing out.

The central angle α of the lip portion 14 is set at about 60 ° to 1
When the fitting protrusions 28b and 32b are fitted into the fitting holes 56a and 56b of the joints 50a and 50b, the lip portion 14 is smoothly deformed and the joints 50a and 50b
0b can be satisfactorily adhered to the end face.

[0015]

According to the present invention, it is possible to prevent water droplets and dust from entering between the drive shaft for driving the work rolls of the rolling mill and the work rolls, and the grease between the two is deteriorated or flows out. Is prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view between a work roll before connection and a drive shaft for the work roll.

FIG. 2 is a front view of a rolling mill.

FIG. 3 is a half sectional view of a dust seal.

FIG. 4 is a partial sectional view of a work roll and a joint to which a dust seal is attached.

FIG. 5 is a front view of a fixing band.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Dust seal 28 ... Work roll 28a ... Work side roll axis of work roll 32 ... Work roll 32a ... Work side roll axis of work roll 50a ... Coupling 50b ... Coupling 52a ... Drive shaft of work roll drive device 52b ... Work roll Drive shaft of drive device 54a Drive device of work roll 54b Drive device of work roll 56a Fitting hole of joint 55b Fitting hole of joint

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J006 AE15 AE28 AE41 3J040 AA01 AA12 BA01 EA02 EA16 FA05 HA15 3J103 AA02 FA21 FA22 GA02 GA15 GA52

Claims (3)

[Claims] 1. A work roll of a rolling mill, comprising: a drive shaft of a drive device for driving the work roll;
A work roll of a rolling mill in which a dust seal is provided between the work rolls. 2. A work roll, wherein the dust seal includes a cylindrical portion attached to one end of the work roll, and a lip portion abutting on an end of the drive shaft. 3. The work roll according to claim 2, wherein the lip portion of the dust seal expands from the work roll side to the joint side in a frustoconical shape having a central angle of about 60 ° to 140 °.