JP4699904B2 - Roll bearing device for hot processing equipment - Google Patents

Description

  The present invention relates to a roll bearing device used in a hot processing facility such as a continuous casting machine, and more particularly to an apparatus that is excellent in preventing intrusion of water, scale, and the like into a bearing accompanying a temperature change of the roll length.

  Many rolls are used for the slab cooling support guide mechanism provided directly under the mold of the continuous casting machine. As the slab passes through, the roll is exposed to temperature changes from high temperature immediately after casting to room temperature, and just below the mold, cooling water is sprayed onto the surface of the slab to cool it down, so that water vapor, scales that have peeled off, etc. Used in harsh environments filled with dust.

  The roll is supported by a bearing box via a bearing attached to the roll shaft, and the bearing portion and the bearing box are sealed so that cooling water and dust do not enter the inside. FIG. 5 shows an example of a bearing portion of a bearing box, and the roll shaft 100 is supported by a bearing 200 sealed with a sealing material 700.

  In the case of the slab cooling support guide mechanism, the pressure fluctuation accompanying the volume fluctuation in the bearing box is caused by the expansion and contraction in the roll axis direction due to the temperature change described above. The bearing box shown in FIG. 4 is provided with the seal material 700, but is not provided with a mechanism for absorbing pressure fluctuations. Therefore, when the pressure is high, grease is discharged from the bearing portion, and when the inside of the bearing box is low Inhales water vapor and dust in the atmosphere, resulting in reduced bearing life and bearing life. For this reason, various mechanisms for absorbing volume fluctuation in the chock have been proposed.

  Patent Document 1 relates to a roll bearing device for hot processing equipment, in order to prevent pressure fluctuations in the bearing due to temperature changes, the bearing is always sealed with the internal pressure increased, and the bearing is protected from dust and moisture and leakage of lubricant. A roll bearing device for hot processing equipment that appropriately prevents the above is described.

  Patent Document 2 relates to a bearing used for a continuous casting equipment roll neck or the like, and in order to prevent intrusion of foreign matter from the outside of the bearing box, a pressure-resistant oil seal is attached to the bearing box so that grease does not leak from the seal portion. It is described that the inside is pressurized with an inert gas or dry air.

  Patent Document 3 relates to a bearing sealing device such as a rotary machine, and has a double structure of seals. One of the lips of each seal faces inward to facilitate leakage of grease from the bearing, and the other faces outward. Facilitates the prevention of foreign matter from entering the outside. And it describes that dust-proof and dehumidified gas is blown between two seals.

  Further, in order to absorb the volume fluctuation inside the bearing box due to the expansion of the roll shaft, it has been proposed to provide a small space sealed inside the bearing box and to provide a diaphragm on a part of the outer periphery thereof.

FIG. 4 is surrounded by the chock outer peripheral portion 300a and the end portion 300b in the chock, and absorbs the fluctuation when the inner volume of the gap 600 between the roll shaft 100 and the bearing 200 fluctuates due to the expansion of the roll shaft. A part of the wall 400 made of seal rubber is a partial cross-sectional view of the main part of the bearing provided with a deformable chamber 500 at the end 300b.
JP-A-5-237523 JP-A-10-249502 Japanese Patent Laid-Open No. 11-344128

  By the way, the vicinity of the slab cooling support guide mechanism of the continuous casting machine is filled with cooling nozzles arranged in a large number for cooling the slab with water and piping for supplying cooling water to the nozzles. It is not easy to newly provide a compressor and a supply pipe for supplying pressurized gas which are necessary when the described bearing device is used.

Further, when the roll becomes high temperature, the roll elongation amount is as large as about 3 mm. Therefore, the bearing portion shown in FIG. 4 has a large chamber for absorbing the volume fluctuation, and is structurally complicated.

  Therefore, an object of the present invention is to provide a chock that does not require new equipment such as a pressurizer and a pressurized gas supply pipe.

The object of the present invention can be achieved by the following means.
1. It is a roll bearing device for hot processing equipment having a gap surrounded by a roll shaft provided with a pressure adjustment mechanism, a chock component, an end body and an outer periphery protector of the roll shaft, and sealed from the atmosphere with a seal. The pressure adjusting mechanism includes a chamber in which a water cooling hole formed in the roll shaft is partitioned by a closing plate, a diaphragm provided in an opening on the roll end side of the chamber, and a gap between the closing plate and the diaphragm. The diaphragm wall thickness and spring strength so that air in the gap does not leak from the seal when the roll shaft expands, and the spring strength is roll Is selected so that the diaphragm can be pulled back instantaneously to prevent a decrease in the internal pressure of the gap. During processing equipment roll bearing device.
2. When the diaphragm of the pressure adjusting mechanism is replaced with a combination of a cylinder and a piston inserted into a hole formed in the roll shaft, the piston moves into the chamber when the internal pressure of the gap rises. The roll bearing device for hot processing equipment according to claim 1, wherein the roll bearing device is selected so as to return to its original position when the internal pressure decreases.
3. The piston is provided with a conduit that communicates the inside of the cylinder and the atmospheric atmosphere through a hole provided in the end body, and the conduit is fixed to the end body or the piston, and is fixed to the end body. 3. The roll bearing for hot processing equipment according to claim 2, wherein the piston is inserted through a seal and the end body is inserted through the seal when fixed to the piston. apparatus.

  According to the present invention, a bearing box excellent in dustproof and moistureproof performance can be obtained with a simple mechanism, which is extremely useful industrially.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view of a main part of a bearing device according to an embodiment of the present invention.

  In the figure, 1 is a roll shaft, 2 is a bearing 2 that supports the roll shaft 1, 3 is a chock component, 4 is an end body, 5a and 5b are outer periphery protectors of the roll shaft 1, 6a and 6b are seals, and 7a is Bearing rolling element, 7b is a bearing inner ring, 8 is a closing plate, 9 is a spring, 10 is a roll, 11 is a gap around the roll shaft 1 in the bearing, 12 is a chamber, 13 is a water cooling hole, 14 is a diaphragm, and 15 is a through hole. A hole, a indicates a displacement amount when the roll shaft 1 is expanded, and b indicates a deformation amount of the diaphragm 14.

  In the bearing device according to the present invention, a water cooling hole 13 is formed at the end of the roll shaft 1, and the inside thereof is partitioned by a closing plate 8 to form a chamber 12. The opening of the chamber 12 (the end side of the roll shaft 1) is partitioned by a diaphragm 14, and a spring 9 is installed between the closing plate 8 and the diaphragm 14.

  When the roll 10 becomes high temperature and the roll shaft 1 expands by the displacement amount a, the volume of the gap 11 surrounded by the chock component 3, the end body 4, and the outer peripheral protectors 5 a and 5 b of the roll shaft 1 decreases, and the gap 11 The internal pressure increases.

  When the internal pressure of the gap 11 increases and the air in the gap 11 leaks from the seals 6a and 6b, the grease leaks, and when the roll 10 reaches room temperature, water and dust are sucked in from the outside. 2 wears out.

  Therefore, the wall thickness of the diaphragm 14 and the strength of the spring 9 can prevent the air in the gap 11 from leaking from the seals 6a and 6b due to the movement of the diaphragm 14 when the roll shaft 1 expands. Select

  Further, the strength of the spring 9 is selected so that when the temperature of the roll 10 decreases, the diaphragm 14 can be pulled back instantaneously to prevent the internal pressure of the gap 11 from decreasing.

  FIG. 2 shows another embodiment of the present invention in which a piston 17 is inserted into a cylinder 18 instead of a diaphragm, and a seal 6c is attached to the piston 17 in order to make the inside of the cylinder a sealed space.

  In the figure, a dotted line c indicates the movement position of the piston 17 due to an increase in the internal pressure of the gap 11. The piston 17 overcomes the repulsive force of the spring 9 due to the increase of the internal pressure of the gap 11 and moves to the position indicated by the dotted line c. When the internal pressure of the gap 11 decreases, the piston 17 returns to the original position.

  FIG. 3 is a more preferred embodiment of the structure shown in FIG. 2, and shows a structure provided with a conduit 19 that communicates the inside of the cylinder 18 with the outside (atmosphere) through a hole provided in the end body 4 of the bearing.

  The conduit 19 is long enough to allow the inside of the cylinder 18 to communicate with the outside of the bearing even when the piston 17 moves, and is fixed to the piston 17 or the end body 4.

  When the conduit 19 is fixed to the end body 4, it is preferable to perform welding so that air does not enter from the fixing portion. At this time, the place where the conduit 19 is inserted through the piston 17 has a seal structure with the seal 6 d so that the atmosphere introduced into the cylinder 18 by the movement of the piston 17 does not leak into the gap 11.

  When the conduit 19 is fixed to the piston 17, a portion where the conduit 19 is inserted at the end 4 is a sealing structure. By connecting the inside of the cylinder 18 and the outside of the bearing, it is possible to suppress an increase in pressure inside the cylinder 18 when the piston 17 moves, and it is possible to mitigate pressure fluctuations associated with fluctuations in roll temperature. It becomes.

Example of the present invention Example of the present invention Example of the present invention Conventional example Roll bearing box structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll shaft 2 Bearing 3 Chock component part 4 End part 5a, 5b Outer periphery protection body 6a, 6b, 6c, 6d Seal 7a Bearing rolling element 7b Bearing inner ring 8 Closing plate 9 Spring 10 Roll 11 Gap 12 Chamber 13 Hole 14 Diaphragm 16 18 cylinder 17 piston 19 conduit a roll axis displacement
b Diaphragm deformation c Piston moving position

Claims (3)

It is a roll bearing device for hot processing equipment having a gap surrounded by a roll shaft provided with a pressure adjustment mechanism, a chock component, an end body and an outer periphery protector of the roll shaft, and sealed from the atmosphere with a seal. The pressure adjusting mechanism includes a chamber in which a water cooling hole formed in the roll shaft is partitioned by a closing plate, a diaphragm provided in an opening on the roll end side of the chamber, and a gap between the closing plate and the diaphragm. The diaphragm wall thickness and spring strength so that air in the gap does not leak from the seal when the roll shaft expands, and the spring strength is roll Is selected so that the diaphragm can be pulled back instantaneously to prevent a decrease in the internal pressure of the gap. During processing equipment roll bearing device. When the diaphragm of the pressure adjusting mechanism is replaced with a combination of a cylinder and a piston inserted into a hole formed in the roll shaft, the piston moves into the chamber when the internal pressure of the gap rises. The roll bearing device for hot processing equipment according to claim 1, wherein the roll bearing device is selected so as to return to its original position when the internal pressure decreases. The piston is provided with a conduit that communicates the inside of the cylinder and the atmospheric atmosphere through a hole provided in the end body, and the conduit is fixed to the end body or the piston, and is fixed to the end body. 3. The roll bearing for hot processing equipment according to claim 2, wherein the piston is inserted through a seal and the end body is inserted through the seal when fixed to the piston. apparatus.

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