JPH0442003Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a sealing structure for a back-up roll in a rolling mill, specifically, the cooling water used in the rolling mill is connected to the end face of the back-up roll and the opposite end of the roll chock. The present invention relates to a seal structure for preventing intrusion into the sealed portion of a roll neck from between the sealing portion and the sealing portion of the roll neck.

(Prior art) As is well known, in the back-up roll roll neck of a rolling mill, it is necessary to prevent lubricating oil from leaking from the bearing side to the outside, and to prevent cooling water used during operation from entering the bearing. A seal structure that prevents this is required.

As shown in FIG. 3, a typical conventional structure of this seal part includes a sleeve 2 whose outer periphery is the sliding surface of a bearing in a journal part 1A at the neck part of the rolling roll 1. mated,
A bearing metal 4 called a bushing is attached to the chock 3 side, and lubricating oil normally flows out from between the bearing metal 4 and the sleeve 2. In order to prevent this lubricating oil from leaking to the outside, a sealing material 5 made of an elastic material is provided with three lip portions 5A, 5B, and 5C on the neck portion of the rolling roll 1, and a spring 6 is attached to the sealing material 5. The lip portion 5 of the sealing material 5 is tightly secured to the inner peripheral end surface of the end plate 7 attached to the chock 3.
A and 5B are elastically brought into contact with each other. On the other hand, in order to prevent the cooling water on the rolling roll 1 side from entering the bearing section, an outer ring 8 is provided on the end surface of the end plate 7, and an inner ring 9 is provided on the sealing material 5 side, forming a so-called labyrinth. Furthermore, an elastic ring 10 is interposed between the inner ring 9 and the end surface of the rolling roll 1.

(Problems to be solved by the invention) However, in the conventional seal structure described above, the intrusion of cooling water into the bearing part is a bigger problem than the leakage of lubricating oil. The sealing function is not necessarily sufficient, and a portion of the cooling water flowing along the end surface of the rolling roll 1 may enter the labyrinth space 11 through the sealing portion formed by the inner ring 9 and the elastic ring 10. Occurs often. The design is such that the cooling water that has entered this labyrinth space 11 is removed to the outside through a drain hole 12 formed in the outer ring 8, and the cooling water that has entered the bearing section is prevented from entering the bearing section through the lip of the sealing material 5 described above. 5A and 5B, but if the lip parts 5A and 5B become worn or hardened, the sealing function will deteriorate and the cooling water will leak into the space 13 of the bearing part little by little. If the cooling water enters, it cannot be removed, and if rolling operations are continued for a long time without knowing that this cooling water has entered, the lubricating oil will deteriorate and cause a bearing seizure accident.

(Means for Solving the Problems) The present invention is intended to improve the waterproof function of the conventional seal structure described above, and as shown in FIG. The outer ring 8 on the chock 3 side is provided with a cut-off plate 22 whose outer circumferential surface 22A protrudes radially outward than the circumferential surface of the inner step 21 on the end surface of the outer step 20. The outer ring 8 has a cross-sectional shape of approximately L on the end surface.
A letter-shaped elastic seal material 23 is attached, and the seal lip 23A of the elastic seal material 23 is attached to the above-mentioned swing plate 22.
The outer peripheral part 25 of the cut-off plate 22 is shaped so as to protrude toward the outer ring 8 side than the outer end face 22B, so that the cut-off plate 22 and the elastic sealing material 23 It is constructed to prevent cooling water from entering into the labyrinth space 11 described above.

(Function) Since the shaker plate 22 rotates together with the roll 1 and grooves 24 are formed between the inner step portion 21 and the shaker plate 22 on both sides of the roll 1, the end face of the roll 1 The cooling water that has flowed to the side once enters the groove 24 and acts to prevent it from flowing directly to the end face of the roll 1.
Most of the cooling water that has reached the outer circumferential surface 22A of the shaker plate 22 is dissipated radially outward by the centrifugal force accompanying the rotation of the shaker plate 22.

In addition, since the outer circumferential portion 25 of the shaker plate 22 is shaped to protrude further toward the outer ring 8 than the outer end surface 22B, the centrifugal force of the shaker plate 22 does not dissipate outward in the radial direction. It is also difficult for some of the cooling water to flow in along the outer end surface 22B.

Furthermore, the elastic sealing material 23 extending from the outer ring 8 side prevents a small amount of cooling water from flowing into the bearing portion side along this outer end surface 22B.

(Example) Example 1 To explain more specifically based on FIG. 1 showing an example of the present invention, the structure for preventing leakage of lubricating oil in the bearing portion of a rolling roll to which the present invention is applied is as follows. Similar to the conventional structure, a sleeve 2 is fitted into a journal portion 1A at the neck portion of the rolling roll 1, and a bearing metal 4 called a bushing is attached to the neck 3 side. In order to prevent the lubricating oil from the bearing from leaking to the outside,
Three lip portions 5 are provided at the neck portion of the rolling roll 1.
A sealing material 5 made of an elastic material and provided with A, 5B, and 5C is tightened and fixed by a spring 6, and an end plate 7 is attached to the chock 3.
The lip portions 5A and 5B of the sealing material 5 are attached to the inner peripheral end surface of the sealing material 5.
are elastically abutted, and the remaining lip portion 5C is pressed against the neck portion of the roll 1.

The present invention further includes a sealing structure as shown in the drawings in order to prevent cooling water from entering the bearing portion of the neck portion of the rolling roll equipped with such a lubricating oil leakage prevention structure.

That is, the diameter of the end surface side of the rolling roll 1 is reduced in two steps to form an outer step portion 20 and an inner step portion 21. An outer circumferential surface 22 is provided on the end surface of the outer step portion 20.
A swinging plate 22 having a portion A projecting radially outward from the circumferential surface of the inner step portion 21 is attached to face the outer ring 8 on the chock 3 side. As a result, an annular groove 24 is formed on both sides of the rolling roll 1 by the inner step portion 21 and the cutting plate 22.

On the other hand, on the end surface of the outer ring 8, an elastic sealing material 23 having a substantially L-shaped cross section is attached to the mounting bolt 2.
6, so that the seal lip 23A of the elastic seal material 23 is brought into elastic contact with the outer end surface 22B of the swing plate 22. Thereby, a waterproof seal portion is formed by the elastic sealing material 23 and the cut-off plate 22 on the radially outer side of the elastic ring 10 between the inner ring 9 and the end surface of the roll 1.

Further, the outer circumferential portion 25 of the shaker plate 22 is shaped to protrude toward the outer ring 8 side than the outer end surface 22B with which the seal lip 23A of the elastic sealing material 23 comes into contact, so that the cooling water can flow along the outer end surface 22B. prevent the influx of In other words, some of the cooling water that was not dissipated outward due to the centrifugal force of the shaker plate 22 is further removed from the outer end surface 22B.
However, the existence of the outer peripheral portion 25 prevents the water from flowing into the outer end surface 22B.

Example 2 This example is shown in FIG.
This is a modified structure of .

That is, the outer circumferential surface 22A of the shaker plate 22
is made to protrude further radially outward than in the case of the first embodiment, and its outer circumferential portion 25 is shaped to extend to the radially outer side of the outer circumferential surface of the outer ring 8.

Other structures and operations are the same as in Example 1.

Further, the present invention is not limited to the illustrated example, and various design changes are possible.
has a smooth outer end surface 22B with which the elastic sealing material 23 comes into close contact, and the outer circumferential surface 22A protrudes radially outward from the circumferential surface of the inner step 21. It is possible to change the shape within the range.

(Effects of the invention) As detailed above, according to the invention, various excellent effects as listed below can be obtained, and the waterproofness of the bearing portion is significantly improved compared to the conventional seal structure. The waterproof effect can be maintained for a long period of time.

(1) Since grooves 24 are formed on both sides of the roll 1 by the inner step portions 21 and the cut-off plates 22, the cooling water flowing toward the end surface of the roll 1 once enters the grooves 24. Flowing directly to the end face of the rolling roll 1 is prevented. Moreover, most of the cooling water that has crossed this groove 24 and reached the outer circumferential surface 22A of the shaker plate 22 is radiated outward by the centrifugal force of the shaker plate 22 that rotates together with the rolling roll 1. That will happen.

(2) Furthermore, since the outer circumferential portion 25 of the shaker plate 22 is shaped to protrude toward the outer ring 8 side than the outer end surface 22B, the shaker plate 22 does not dissipate, and the A portion of the cooling water that would like to gradually flow toward the bearing side along the end surface is prevented from flowing into the outer end surface 22B due to the presence of the outer peripheral portion 25.

(3) Furthermore, since the seal lip of the elastic sealing material extends from the outer ring 8 side and presses against the outer end surface 22B of the swinging plate 22, the swinging plate 22
Even a small amount of cooling water that attempts to infiltrate into the interior through the outer end surface 22B of 2 is prevented from further intrusion.

(4) These multiple seal structures maintain the waterproof effect over a long period of time, significantly delaying the deterioration of the lubricating oil due to the intrusion of cooling water, and dramatically extending its lifespan (approximately 3 times longer than before). (approximately twice as much).
Moreover, it is possible to reduce maintenance costs, and it is possible to exhibit many practical effects such as eliminating the occurrence of bearing seizure accidents.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a seal portion showing Embodiment 1 of the present invention, Fig. 2 is a partial sectional view of a seal portion showing Embodiment 2, and Fig. 3 is a sectional view showing a conventional seal structure. It is. DESCRIPTION OF SYMBOLS 1... Rolling roll, 3... Chock, 8... Outer ring, 20... Outer step part, 21... Inner step part, 22... Cutting plate, 22A... Outer peripheral surface of cutting plate, 22B... ...Outer end surface of the shaker plate, 23...
...Elastic sealing material, 23A... Seal lip of elastic sealing material, 24... Groove.

Claims (1)

[Claim for Utility Model Registration] The diameter of the end face of the roll is reduced in two stages to form an outer step and an inner step, and the end face of the outer step has an outer circumferential surface that is smaller than the circumferential surface of the inner step. A swinging plate that protrudes radially outward is installed opposite the outer ring on the chock side, and a cross-sectional shape of approximately L is attached to the end face of the outer ring.
A letter-shaped elastic sealing material is attached, and the sealing lip of the elastic sealing material is elastically brought into close contact with the outer end surface of the swinging plate, and the outer peripheral part of the swinging plate is moved closer to the outer ring than the outer end surface. A seal structure for a back-up roll in a rolling mill characterized by a protruding shape.