JPH09112787A - Grease storing apparatus for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replenish grease against a negative load generated in a rolling bearing receiving box by a simple structure and without always applying applied pressure, by providing a passing opening communicated with the atmosphere to a space partitioned by a piston while covers are attached to both end of the space so as to close the space, and providing a passing hole communicated with the inside of an inner pipe to the other space. SOLUTION: In a grease amount storing apparatus for a rolling bearing, pipe couplings 29 arranged to a grease supply piping 7 are attached by being screwed in female screw 17, 25 of covers 4, 5, and every time grease is supplied at a desired grease supplying interval through a distribution valve by a concentrical grease supplying device, grease is penetrated from a penetrating opening 28 by grease supplying pressure, and air is passed from a penetrating hole 20 of the cover 4 so as to push a piston 3 on a cover 4 side so that grease is filled into a space between the cover 4 side and a cover 5 side. After that, if the inside of a rolling bearing box is evacuated by stopping operation, grease is replenished so as to compensate negative pressure, therefore, smoothness of bearing action can be effectively executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll bearing for connecting a pipe to a roll bearing of a greasing device for applying lubrication grease to the roll bearing by applying pressure at a desired greasing interval. Regarding the grease accumulator, in particular, the grease accumulator for roll bearings that can be suitably used for roll bearings such as pinch rolls, guide rolls, and rolling rolls in hot processing equipment such as continuous casting equipment and hot rolling equipment. is there.

[0002]

2. Description of the Related Art In a continuous casting facility, a large number of pinch rolls and guide rolls are arranged below the mold in order to pull out a slab from the mold, and in a rolling mill, a large number of guide rolls are provided before and after the rolling rolls. Rolls are arranged, and a large number of guide rolls are arranged also in the heat treatment equipment. These rolls are generally bearings in a bearing box with a bearing or the like interposed between the rolls. .

As the above-mentioned bearing structure, for example, as shown in FIG. 4, a dust wiper type oil seal 34 (a lip is incorporated outward as a contact type seal as shown in FIG.
The grease inside is free to flow to the outside and an oil seal that prevents outside dust from entering the inside) and bearings
Fit 35 and install bearing retainer 36
After mounting on 37, mount bearing box 38, and then oil seal
The grease is supplied from a greasing pipe 7 connected to a greasing passage 41 provided in the bearing base 37, which is configured by attaching a 39 and a lid 40. Since a large number of rolls are arranged in the continuous casting equipment or the like, the greasing pipe 7 connected to each roll bearing is connected to a central greasing device (not shown) through a distribution valve 42 to centralize. The grease supply device applies pressure to the roll bearings at regular intervals to replenish the roll bearings with grease, and the excess or deteriorated grease in the roll bearing box 38 is discharged from the dust wiper type oil seal 34 to smooth the bearing action. There is.

[0004]

By the way, in the above-mentioned method of lubricating the roll bearing, the influence of the pressure change on the temperature change is not taken into consideration. Specifically, it is ideal that the roll bearing box 38 is filled with grease so that no space remains, but in reality, a space is created by the pocket portion and the bearing rotation resistance. For this reason, the gas in the space expands and contracts in a region where the temperature changes greatly, and the grease is removed during the expansion by the dust wiper type oil seal 34.
The inner pressure is balanced by further pushing it out, but when it contracts, it becomes a negative pressure, and when it increases, the lips of the oil seals 34, 39 return and suck in dust and the like from the outside. Especially,
In the bearing box 38 placed in an environment with severe heat influence such as the above continuous casting equipment, the pressure change due to the temperature change is large, and improvement of this kind of problem is demanded.

On the other hand, as one technique for improving the above-mentioned problems, there is a technique proposed in Japanese Patent Laid-Open No. 7-71445. According to the proposal in this publication, a roll for connecting a grease supply pipe and a discharge pipe to a roll bearing box respectively, and supplying grease from the grease supply pipe into the roll bearing box and discharging excess or deteriorated grease from the discharge pipe. In the bearing device, a greasing method in which grease is pushed into the roll bearing box at a predetermined pressure during at least contraction of a corner ring for fixing and supporting the roll bearing box to the roll neck, and more specifically, a roll bearing box. A pressurizing device that presses grease into the inside of the pressurizing device is connected to any one of the grease supply pipe, the grease discharge pipe, and the roll bearing box through the pressurizing pipe, while the pressurizing device is connected to the grease supply pipe. And the high-pressure air supply pipe are connected to each other to replenish the grease in the pressurizing device by applying pressure with high-pressure air.

The above-mentioned proposal applies pressure by high-pressure air to the grease in the pressurizing device not only at the time of operation stop but also during operation, and pushes the grease into the roll bearing box at a predetermined pressure. While it is possible to prevent the inside of the bearing box from becoming a negative pressure state and to effectively suck in dust etc. from the outside, it is necessary to replenish the pressure device with grease and constantly apply pressure with high pressure air. Maintenance is complicated.

The present invention has been made in view of the above circumstances, and an object thereof is a negative pressure generated in a roll bearing box with a simple structure and without constantly applying a pressing force. To provide a grease accumulator for roll bearings capable of supplying grease.

[0008]

In order to achieve the above object, a grease accumulator for roll bearings according to the present invention has a pipe shaft in a space between an inner pipe and an outer pipe of a double pipe structure of an inner pipe and an outer pipe. In addition to providing a piston that is movable in the same direction and closing it by attaching a lid to each end of the space, a through hole that communicates with the atmosphere is provided in one of the spaces partitioned by the piston, and the inside of the other space is closed. The pipe is provided with a through hole communicating with the inside of the pipe.

In the grease accumulator for roll bearing, a through hole communicating with the atmosphere may be provided in the lid or the outer tube near the lid. Further, a through hole communicating with the inside of the inner pipe may be provided in the inner pipe along the inside of the lid or near the lid. Furthermore, a connecting screw may be provided in a central through hole of both lids communicating with the inner pipe.

In the grease accumulator according to the present invention described above, the inner pipe is connected in the middle of the pipe to the roll bearing of the greasing device which applies pressure at a desired greasing interval to concentrate lubrication grease on the roll bearing. It is connected and used.Each time the central lubrication device applies pressure at a desired lubrication interval to replenish the roll bearing box with grease, the grease accumulator also has a through hole that communicates with the inside of the inner pipe. Grease is pushed in. At this time, the piston moves in a direction of narrowing the space having the through hole communicating with the atmosphere. If there is a negative pressure in the roll bearing box due to operation stop etc., the piston is pushed by the atmospheric pressure and moves in the direction to push the grease into the inner tube to compensate the negative pressure generated in the roll bearing box. Grease is replenished.

[0011]

1 is a cross-sectional view of a grease accumulator for roll bearings according to the present invention, in which 1 is an outer pipe and 2 is an outer pipe.
Is an inner tube, 3 is a piston, and 4 and 5 are lids.

The outer pipe 1 and the inner pipe 2 are metal pipes, and female screw portions 6 for attaching the lids 4 and 5 are provided inside both ends of the outer pipe 1. The inner diameter of the inner pipe 2 is not particularly limited, but in this example, it is substantially the same as the inner diameter of the greasing pipe 7.

The piston 3 is a donut-shaped plate having a relatively large thickness, and grooves 10 and 11 for mounting the U packings 8 and 9 are provided on the inner and outer peripheral surfaces thereof, while the inner and outer peripheral surfaces are centered in the thickness direction. A through hole 12 is formed in the portion, and a communicating hole 13 is formed from one plate surface so as to communicate with the through hole 12, and the through hole 12 and the communicating hole 13 have a predetermined interval (for example, 60 ° interval). It is provided in. The through hole 12 and the communication hole 13 are for guiding the grease to the outer peripheral surface of the piston 3 for seal lubrication when the space between the through hole 12 and the communication hole 13 is filled with the grease.

The lid 4 is a donut-shaped plate having a relatively large thickness, and on the outer peripheral surface thereof, a male screw portion 14 for attaching to the outer tube 1 and an O-ring 15 for airtightly supporting the inner surface of the outer tube 1 are attached. A groove 16 for drilling is formed on the other hand, and on the other hand, a groove for mounting an internal thread portion 17 for connecting the greasing pipe 7 and an O-ring 18 for airtightly supporting the outer surface of the inner pipe 2 on the inner peripheral surface. 19 are drilled.
Further, a through hole 20 is formed in the central portion in the plate thickness direction.

The lid 5 is a donut-shaped plate having a relatively thick thickness, which is provided with a ring-shaped protruding portion 21 on the outer peripheral side of one plate surface, and is attached to the outer tube 1 on the outer peripheral surface including the protruding portion 21. O-ring 23 that hermetically supports the male threaded portion 22 of the
A groove 24 is formed for mounting the inner peripheral surface, and a female screw portion 25 for connecting the greasing pipe 7 is formed on the inner peripheral surface. In this example, a donut-shaped inner pipe holder 27 for holding the inner pipe 2 is provided so as to form a space 26 between the inside of the lid 5 and the pipe end of the inner pipe 2. 27
A through hole that communicates with the inner tube 2 through the space 26 in the center of the
28 are provided at predetermined intervals.

In the grease accumulator for roll bearings having the above structure, the pipe joint 29 provided in the greasing pipe 7 is provided in the middle of the greasing pipe 7 shown in FIG. It is installed by screwing it into the distribution valve by a central greasing device (not shown).
Each time grease is lubricated at a desired lubrication interval via 42,
Due to the greasing pressure, the grease enters from the through hole 28 and the lid 4
Air escapes from the through-hole 20 and pushes the piston 3 to the lid 4 side, and the space between the piston 3 side and the lid 5 side is filled with grease. Then, after that, the roll bearing box 38
If the inside becomes negative pressure, the piston 3 is pushed by the atmospheric pressure to move the grease into the inner tube 2 and the grease is replenished so as to compensate the negative pressure generated in the roll bearing box 38. Therefore, excess or deteriorated grease in the roll bearing box 38 is discharged from between the roll shaft portion 33 and the dust wiper type oil seal 34 each time greasing is performed, but on the contrary, there is no suction and there is no suction of dust or the like. Therefore, smoothing of the bearing action can be effectively achieved. Further, since it acts in this way, even when the roll bearing box 38 of the hot treatment equipment is subjected to a large temperature change due to a thermal effect such as radiant heat, a large negative load is generated in the roll bearing box 38 due to the temperature change. Grease is replenished so as to supplement the negative pressure with respect to the pressure, and it is possible to prevent dust and the like from being sucked into the roll bearing box 38.

In the above example, the inner pipe holder 27 is used and the through hole 28 communicating with the inner pipe 2 is provided at the center of the inner pipe holder 27. However, the present invention is not limited to this example. As shown in FIG. 2, a lid 5 having the same cross-sectional structure as the lid 4 can be used. In this case, the inner tube 2 is supported by the inner surface of the lid 5, and the through-hole 28 is formed in the vicinity of the inner side of the lid 5. It may be provided directly on the tube 2. Thus, the lid 5 side supports the inner and outer pipes 1 and 2, and a through-hole that communicates with the inside of the inner pipe 2 near the inside of the lid 5.
28 should be provided.

Further, in the above example, the female screw portions 17,
Although the example in which 25 is provided and the pipe fitting 29 provided in the greasing pipe 7 is screwed in and attached is described, a flange may be provided in the greasing pipe 7 to connect it to the surfaces of the lids 4 and 5 with packing interposed. Good. In addition, the example of connecting directly to the middle of the greasing pipe 7 has been described, but as shown in FIG. 3, the plug 30 is screwed into the female thread portion 17 of the lid 4 to close the same, while the greasing pipe 7 is connected to the tee.
31 is provided, and the tee 31 and the female screw portion 25 of the lid 5 are connected to each other.
Even if the connection is made via 32, the same effect as the above example can be obtained.

[0019]

As described above, according to the grease accumulator for roll bearings of the present invention, it is generated in the roll bearing box with a simple structure and without constantly applying a pressing force. The grease can be replenished against the negative pressure, and it is possible to prevent dust and the like from being sucked into the roll bearing box. Therefore, especially in the case of a central bearing of a split roll of a continuous casting facility, it is necessary to attach a new grease pipe (grease) to the existing grease pipe (grease), which has a large temperature change. Can be used effectively on difficult areas.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an upper cross section of a grease accumulator for roll bearings according to the present invention.

FIG. 2 is an explanatory view showing an upper cross section of another embodiment of the grease accumulator for roll bearings according to the present invention.

FIG. 3 is an explanatory diagram showing a right cross section of another embodiment of the grease accumulator for roll bearings according to the present invention.

FIG. 4 is an explanatory diagram including a greasing pipe for a conventional roll bearing box.

[Explanation of symbols]

1: Outer tube 2: Inner tube
3: Piston 4, 5: Lid 6: Female thread
7: Greasing piping 8, 9: U packing 10, 11: Groove 1
2: Through hole 13: Communication hole 14: Male thread 1
5, 18: O-ring 16, 19: Groove 17: Female thread 2
0: Through hole 21: Projection 22: Male screw 2
3: O-ring 24: Groove 25: Female thread 2
6: Space 27: Inner tube holder 28: Through hole 2
9: Pipe fitting 30: Plug 31: Tee 3
2: Connection tube

Claims (4)

[Claims] 1. A piston, which is movable in an axial direction of a pipe, is provided in a space between an inner pipe and an outer pipe of a double pipe structure of an inner pipe and an outer pipe, and a lid is attached to each end of the space to close the piston.
A grease accumulator for roll bearings, wherein a through hole communicating with the atmosphere is provided in one of the spaces partitioned by the piston, and a through hole communicating with the inside of the inner tube is provided in the other space. 2. The grease accumulator for roll bearing according to claim 1, wherein a through hole communicating with the atmosphere is provided in the lid or the outer tube near the lid. 3. The grease accumulator for roll bearing according to claim 1, wherein a through hole communicating with the inside of the inner tube is provided in the inner tube along the inside of the lid or near the lid. 4. The grease accumulator for roll bearings according to claim 1, wherein a connecting screw is formed in a central through hole of both lids communicating with the inner pipes.