JP3416014B2 - Internal pressure bearing box for roll neck - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing using grease used as a roll neck for continuous casting equipment as a lubricant, and foreign matter such as water, steam and dust from the outside of the bearing box is contained in the bearing box. The present invention relates to an internal pressurizing bearing box for a roll neck that prevents intrusion.

[0002]

2. Description of the Related Art The environment in which a bearing for a roll neck used in a steel facility or the like is used is extremely severe in terms of temperature, water and dust. Therefore, the life of the lubricant used in the bearing is often not the life of the lubricant itself, such as shear failure of the thickener contained in the grease, but grease deterioration due to the intrusion of foreign matter from the outside of the bearing box. .

Therefore, as disclosed in Japanese Patent Laid-Open No. 63-26799, development of a lubricant itself which can withstand a bad environment such as grease having excellent shear stability when containing water, and Japanese Laid-Open Patent Publication No. The bearing itself has been developed, such as a bearing material having excellent wear resistance as disclosed in Japanese Patent No. 254572. However, although these uses can extend the bearing life to some extent, they have not been a fundamental solution to the intrusion of foreign matter.

Next, looking at the structure of the bearing box, in the conventional roll neck bearing box as shown in FIG. 3, the foreign matter such as water and dust from the outside of the bearing box is shown in FIG. As shown in the figure, the drain port 2 is closed, the oil seals 6 and 7 are attached in the direction in which the grease is discharged from the inside of the bearing box, the grease is supplied continuously or at regular intervals, and the discharged grease is discharged from the seal portion. By doing so, foreign matter has been prevented from entering the bearing box. Therefore, when the environment outside the bearing box is bad, the grease must be supplied as a sealant more than the grease is used as a lubricant for the bearing 9, and a large amount of grease is consumed.

Therefore, as disclosed in Japanese Unexamined Patent Publication No. 5-212515, there has been proposed a device in which dust seals are arranged in multiple stages in addition to an oil seal to prevent foreign matter from entering. However, in this method, there are problems that the application range is limited due to cost increase due to multi-stage and securing a space for installing an oil seal and a dust seal in the bearing box.

As disclosed in Japanese Patent Laid-Open No. 7-71445, it has been proposed to pressurize the grease itself to prevent foreign matter from entering the bearing, but the response speed to pressure fluctuation is slow. If you do not lubricate the grease at the same time as above, the pressure inside the bearing cannot be maintained.
Alternatively, there is a problem that a backup device such as a grease accumulator is required.

[0007]

As described above, in the prior art, measures such as an increase in the amount of grease used and a multi-stage oil seal have been taken against the intrusion of foreign matter from the outside of the bearing. The current situation is that it is complicated and does not completely prevent intrusion. An object of the present invention is to provide an internal pressurizing bearing box for a roll neck, which has a simpler structure and can reliably prevent foreign matter from entering in order to eliminate the grease life due to foreign matter from the outside. To do.

[0008]

The first aspect of the present invention is, as shown in FIG. 1, a bearing box 1 for a neck of a roll 8, a check valve, a relief valve or a drain valve 3 of the bearing box. Attach a drainage pipe resistance 4 such as a pipe having a length having a corresponding drainage resistance so that the pressure can be released when the pressure inside the bearing box exceeds a certain pressure, and a pressure resistant oil seal is used as the oil seals 6 and 7. used, in terms of grease from the seal portion is mounted in a direction that does not leak, the nitrogen from the pressurizing gas pipe 10 provided inside the bearing housing to Haiabura port 2 of the bearing side of the Haiabura piping resistance 4, an inert gas such as argon Alternatively, the gauge pressure in the bearing box is reduced to 0.
The bearing housing to <br/> characterized in that to keep the 1~2.0kg / cm ^2, is intended to prevent reliably foreign matter from entering from the outside of the bearing to the bearing housing within.

As shown in FIG. 2, a second aspect of the present invention corresponds to a check valve, a relief valve, or a drain valve 2 or a drain valve 3 of the bearing box 1 of the roll 8 in the bearing box 1 of the bearing box. A grease discharge pipe resistance 4 such as a pipe having a grease discharge resistance is attached so that the pressure can be released when the pressure inside the bearing box exceeds a certain pressure, and pressure resistant oil seals are used as the oil seals 6 and 7. Installed in the direction in which grease does not leak from the seal part, and pressurizing gas pipe 11 provided inside the bearing box separately from the greasing pipe 12 and the draining pipe 3.
More pressurized with inert gas such as nitrogen, argon or dry air, and the gauge pressure inside the bearing box is 0.1
The bearing box, which is characterized by being kept at 2.0 kg / cm ² , is intended to surely prevent foreign matter from entering the bearing box from the outside of the bearing.

The gauge pressure in the bearing box is set to 0.1 kg / cm ²
If it is less than 1, the pressure is too low to prevent foreign matter from entering, or the overall pressure in the bearing box cannot be properly maintained within a locally non-uniform range of pressure in the bearing box. Therefore, the bearing box in the gate
The pressure was set to 0.1 kg / cm ² or more. If the gauge pressure inside the bearing box exceeds 2.0 kg / cm ² , foreign matter can be prevented from entering from the outside, but internal pressure is applied to the oil seal, which accelerates wear of the lip tip and shortens the service life due to grease leakage. Will end up. Therefore, the gauge pressure inside the bearing box is set to 2.0 kg / cm ² or less.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of an embodiment of a first internal pressure bearing box for roll neck according to the present invention. As shown in FIG.
With a relief valve with a cracking pressure of 0 kg / cm ² , the gauge pressure in the bearing box is 1.0 kg / cm ²
A pressure of Nigaseru so becomes more than, and as oil seals 6 and 7, an oil seal having a pressure resistance of the rotation time of 3.0 kg / cm ^2, in terms of grease from the seal portion is mounted in a direction that does not leak The inside of the bearing box is pressurized with argon having a pressure of 0.8 kg / cm ² from a pressurizing gas pipe 10 provided in the grease discharging port 2 on the bearing side of the grease discharging pipe resistance 4. At this time, a pressurizing gas pipe check valve 5 having a cracking pressure of 0.5 kg / cm ² is attached to the pressurizing gas pipe 10 in order to prevent the inflow of grease. Accordingly, when the bearing housing within the gauge pressure is 1.0 kg / cm ² or more Relieve pressure from Haiabura pipe 3 via a check valve is Haiabura pipe resistance 4, the bearing box internal gauge pressure, the pressure of argon Pressurizing gas pipe 1
When it becomes lower than 0.3 kg / cm ² which is the difference in cracking pressure of the pressurized gas pipe check valve 5 attached to No. 0, argon flows into the bearing box, and the inside of the bearing box is damaged.
It has a structure that can hold the aging pressure at 0.3 kg / cm ² or more.

FIG. 4 is a schematic view of a second embodiment of the inner pressure bearing box for a roll neck according to the present invention. As shown in FIG. 4, the grease discharge pipe 3 has a resistance of 1.0 k as the grease discharge pipe resistance 4.
^2. A check valve having a cracking pressure of g / cm ² is attached so that the pressure can be released when the gauge pressure in the bearing box becomes 1.0 kg / cm ² or more, and the oil seals 6 and 7 are used during rotation. Use an oil seal with a pressure resistance of 0 kg / cm ² and install it in the direction in which grease does not leak from the seal part.
2. Dry gas having a pressure of 0.9 kg / cm ² is pressurized from a gas pipe 11 for pressurization separately provided other than the degreasing pipe 3. At this time, a pressurizing gas pipe check valve 5 having a cracking pressure of 0.5 kg / cm ² is attached to the pressurizing gas pipe 11 in order to prevent the inflow of grease. As a result, the gauge pressure inside the bearing box is 1.0
kg / cm ² or more comprising the relief pressure than Haiabura pipe 3 via a check valve is Haiabura pipe resistance 4, the bearing housing in the gate
When the pressure is lower than 0.4 kg / cm ² which is the difference between the pressure of the dry air and the cracking pressure of the check valve 5 for the pressurized gas pipe attached to the pressurized gas pipe 11, the dry air is discharged into the bearing box. The structure is such that the gauge pressure inside the bearing box can be maintained at 0.4 kg / cm ² or more. Further, although the waste oil may be collected and analyzed and used for the management of bearings and grease, as shown in FIG.
When the piston ring 13 is used on the roll neck side, the drainage pipe 3 is connected to the roll neck side oil seal 7
The piston ring 13 may be connected near the piston ring on the roll neck side to lubricate the piston ring 13, and then the grease may be discharged from the roll neck side.

[0013]

According to the present invention, the bearing box is characterized in that the gauge pressure in the bearing box is kept at 0.1 to 2.0 kg / cm ² , and water vapor is sucked from the outside to the inside of the bearing. It is possible to prevent the negative pressure in the bearing box due to the heat cycle that causes it and prevent the ingress of water, dust, etc. from the outside of the bearing. As a result, the lubricant can be used for the life of the bearing with only the proper amount of grease required for lubricating the bearing.

[Brief description of drawings]

FIG. 1 is a schematic view of a first inner pressure bearing box for roll neck according to the present invention.

FIG. 2 is a schematic view of a second inner pressure bearing box for roll neck according to the present invention.

FIG. 3 is a schematic view of a conventional roll neck bearing box.

FIG. 4 is a schematic view of a second other inner pressure bearing box for a roll neck according to the present invention.

[Explanation of symbols]

1 Bearing Box 2 Drain Port 3 Drain Pipe 4 Drain Pipe Resistance 5 Check Valve for Pressurized Gas Pipe 6 Oil Seal on End Cover 7 Oil Seal on Roll Neck Side 8 Roll 9 Bearing 10 Pressurizing on Drain Port Gas pipe 11 Gas line for pressurization 12 other than greasing and draining pipe 12 Greasing pipe 13 Piston ring

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-237523 (JP, A) JP-A-5-231422 (JP, A) JP-A-8-132137 (JP, A) JP-A-7- 71445 (JP, A) JP-A-5-212515 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B22D 11/128 F16C 13/00 F16C 33/00

Claims (2)

(57) [Claims] 1. A bearing box (1) for a neck of a roll (8), wherein a grease drain pipe resistance (4) is attached to a grease drain pipe (3) of the bearing box.
To allow the pressure to escape when the pressure inside the bearing box exceeds a certain level, and use pressure resistant oil seals as the oil seals (6) and (7), and install them in the direction in which grease does not leak from the seals. Then, the inside of the bearing box is pressurized by the pressure of the inert gas such as nitrogen or argon or the dry air from the pressurizing gas pipe (10) provided in the grease removing port (2) on the bearing side from the grease removing pipe resistance (4). , Bearing box game
Internal pressure bearing box for roll neck, characterized in that to keep the di-pressure 0.1 to 2.0 / cm ^2. 2. In the bearing box (1) for the neck of the roll (8), a grease discharge pipe resistance (4) is attached to the grease discharge port (2) or the grease discharge pipe (3) of the bearing box so that the inside of the bearing box is When the pressure exceeds a certain level, the pressure should be relieved, and pressure-resistant oil seals should be used as the oil seals (6) and (7). A pressure gas pipe (11) separately provided in addition to the oil pipe (12) and the grease discharge pipe (3) pressurizes with an inert gas such as nitrogen and argon or the pressure of dry air to reduce the gauge pressure in the bearing box to 0. 1 to 2.0 kg / cm
Internal pressure bearing box for roll necks, characterized by being kept at ² .