JP3306023B2 - Roll neck sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roll neck sealing device, and more particularly to a roll neck sealing device suitable for a roll structure capable of adjusting the position of a roll shaft by rotating an eccentric cartridge.

[0002]

2. Description of the Related Art A cantilever type rolling mill shown in FIG. 1 is used as a finishing mill for wire rods and steel bars. In this cantilever type rolling mill, the roll shaft 1 is mounted on the eccentric cartridge 3 in order to adjust the distance between the ring roll 4 having the caliber and the pass line.
Is supported by the housing 6 through the roll neck 2, a roll neck sealing device as shown in Japanese Utility Model Publication No. 5-242 is used for the roll neck 2.

The roll neck sealing device is shown in FIGS.
As shown in the figure, a pair of oil drains 7, 7A are fixed to the roll neck 2 of the roll shaft 1, and the double lip type oil seal 11 held on the inner peripheral portion of the eccentric seal retainer 12 is removed from the pair of oil drains 7, 7A. The eccentric seal retainer 12 is fixed to the end face of the eccentric cartridge 3 and is fitted in the hole 8A of the front seal plate 8. The roll neck seal device is provided with an oil seal 11 and oil drainers 7, 7A even when the eccentric cartridge 3 for adjusting the distance between the ring roll 4 and the pass line is rotated.
To prevent oil leakage due to eccentricity. However, a part of the cooling water sprayed to cool the ring roll 4 travels along the outer end face of the eccentric seal retainer 12 and acts intensively on the lip 11A of the oil seal 11 on the roll neck 2 side, and the short-term operation of the rolling mill Lip 11A
And the cooling water containing the scale penetrates into the housing 6 and the lubricant leaks. Since the sealing device is provided on the roll neck 2, even a slight damage to the lip 11A requires replacement with a new oil seal, and the replacement requires a long stoppage of the rolling mill. There was an eager need for a solution.

[0004]

SUMMARY OF THE INVENTION According to the present invention,
It is an object of the present invention to provide a roll neck seal device capable of effectively preventing the eccentric seal retainer fixed to the eccentric cartridge from being concentrated on the lip portion of the oil seal on the roll neck side along the outer end surface of the eccentric seal retainer.

[0005]

According to a first aspect of the present invention, there is provided a roll neck sealing device, wherein an annular projection is formed on an outer end face of an eccentric seal retainer so as to face a gap G on an inner end face of a ring roll. It is assumed that. According to a second aspect of the present invention, there is provided a roll neck sealing device, wherein an annular groove is formed on an inner end surface of the ring roll to fit an annular projection protruding from the eccentric seal retainer. According to a third aspect of the present invention, there is provided a roll neck seal device, wherein an annular groove is provided on both end surfaces of the ring roll so that an annular projection protruding from the eccentric seal retainer is selectively fitted.

According to the roll neck sealing device of the first aspect, a part of the cooling water sprayed on the ring roll 4 travels along the outer end face of the eccentric seal retainer 12 and the roll neck 2
, The outer end face of the eccentric seal retainer 12 is opposed to the inner end face of the ring roll 4 so as to face the annular projection 12.
Since A is formed, the inflow of the cooling water is reliably prevented by the annular projection 12A. According to the roll neck sealing device of the second aspect, since the space between the ring roll 4 and the eccentric seal retainer 12 is shielded by the labyrinth seal, the inflow of cooling water to the roll neck 2 side is reliably prevented. According to the roll neck sealing device of the third aspect, even when the ring roll 4 is replaced with the roll shaft 1, a labyrinth seal can be maintained between the ring roll 4 and the eccentric seal retainer 12.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a roll shaft having a cantilever ring roll 4 at the shaft end, and is rotatably supported by a housing 6 via an eccentric cartridge 3. A pair of oil drains 7 and 7A are fixed to the roll neck 2 of the roll shaft 1, and an eccentric seal retainer 12 is formed in a U-shaped cross-sectional groove formed by the pair of oil drains 7 and 7A. A double lip-shaped oil seal 11 held on the periphery is arranged.

An annular groove 4A is formed on both end faces of the ring roll 4.
4A 'is provided so as to be located outside the outer peripheral ends of the oil drains 7, 7A. The ring roll 4 is provided with two rolling calibers, but only one caliber is selectively used during the rolling operation, and when the shape of the caliber is deformed due to wear or the like, the mounting direction is reversed and the other caliber is used. Use a caliber for rolling.

The eccentric seal retainer 12 is fixed to the eccentric cartridge 3. The outer peripheral surface of the eccentric seal retainer 12 is attached to the front seal plate 8 fixed to the housing 6.
Hole 8A. A flange 12B is formed on the outer peripheral end of the eccentric seal retainer 12, and a seal ring 13 is sandwiched between the flange 12B and the front seal plate 8. The outer end surface of the eccentric seal retainer 12 has an annular groove 4 </ b> A (4 </ b> A) formed on the inner end surface of the ring roll 4.
A ′) is provided with an annular projection 12A that fits into the annular groove 4A (4A ′) to form a labyrinth seal.

The labyrinth seal gap G in this embodiment has a radial direction of 0.75 to 1 mm and an axial direction of 1 mm. Even if a part of the cooling water sprayed on the ring roll 4 tries to flow to the roll neck 2 side along the outer end face of the eccentric seal retainer 12, the annular projection 12 A formed on the outer end face of the eccentric seal retainer 12 becomes In cooperation with the inner end surface of the oil seal 11 to prevent the cooling water from flowing into the oil seal 11 side. In the above embodiment, the labyrinth seal is formed by fitting the annular projection 12A protruding from the eccentric seal retainer 12 into the annular groove 4A (4A ') formed on the inner end surface of the ring roll 4. As shown in FIG. 4, an annular projection 12 ′ facing the inner end face of the ring roll 4 may be provided on the outer end face of the eccentric seal retainer 12. In the case of this modification, if the cooling water is sprayed only when the ring roll 4 is rotating, that is, when the roll shaft 1 is rotating, the gap G between the annular projections 12 ′ facing the inner end surface of the ring roll 4 is widened. It is possible to prevent the flow of the cooling water from the gap G to the oil seal 11 side by utilizing the swinging action of the cooling water due to the rotation of the ring roll 4.

[0011]

According to the present invention, it is possible to reliably prevent the cooling water from flowing into the roll neck side and prevent the oil seal from being damaged. As a result, deterioration of the lubricating oil due to the inflow of the cooling water and generation of rust in the roll housing are suppressed, and problems such as seizure of the bearing due to the scale are eliminated. Since the frequency of replacing the oil seal is reduced, it can greatly contribute to improving the operation rate of the rolling mill.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cantilever rolling mill.

FIG. 2 is a sectional view showing a roll neck sealing device of the present invention.

FIG. 3 is an enlarged sectional view showing the roll neck sealing device of the present invention.

FIG. 4 is a sectional view showing a modified example of the roll neck sealing device of the present invention.

FIG. 5 is a front view showing a conventional seal structure.

FIG. 6 is a sectional view showing a conventional sealing structure.

[Explanation of symbols]

 Reference Signs List 1 roll shaft 2 roll neck 3 eccentric cartridge 4 ring roll 4A, 4A 'annular groove 11 oil seal 11A lip 7, 7A oil drain 12 eccentric seal retainer 12', 12A annular projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-152147 (JP, A) JP-A-61-253107 (JP, A) Fully open 1984-49403 (JP, U) Really open 68908 (JP, U) Jiko 5-242 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 13/00 B21B 31/07

Claims (3)

(57) [Claims] 1. A cross-section formed by a pair of oil drains supported on a housing via an eccentric cartridge and having a cantilevered ring roll at the shaft end and fixed to a roll neck of the roll shaft. An oil seal held on the inner peripheral portion of the eccentric seal retainer is disposed in the U-shaped peripheral groove, and the eccentric seal retainer is fixed to an end surface of the eccentric cartridge and fits into a hole of a seal plate. In the roll neck seal device according to the present invention, the eccentric seal retainer has an outer end surface formed with an annular projection facing the inner end surface of the ring roll with a gap (G) therebetween. . 2. The roll neck sealing device according to claim 1, wherein an annular groove is formed on an inner end surface of the ring roll to fit an annular projection protruding from the eccentric seal retainer. 3. The roll neck sealing device according to claim 1, wherein annular grooves are provided at both end surfaces of the ring roll, into which annular projections projecting from the eccentric seal retainer are selectively fitted. .