A sealing mechanism for an oil film bearing on a roll shaft

Abstract

The present invention discloses a sealing mechanism for an oil film bearing on a roll shaft, which includes a sealing cover, a water seal, an aluminum ring and a multi-limb sealing ring. The cross-section of the aluminum ring is in the shape of "several", and it has an annular plate. An annular guide plate is connected to the inner circumference on one side of the annular plate, and a baffle with an L-shaped cross-section is connected to the outer circumference. The end of the guide plate abuts against the multi-limb sealing ring. On the other side of the annular plate, centrifugal blades are evenly distributed at intervals along the circumferential direction. A rubber buffer pad matching the external contour shape of each centrifugal blade is sleeved outside each centrifugal blade. The aluminum ring abuts against the end face of the roll through the rubber buffer pad outside the centrifugal blades on the other side of its annular plate. After applying the present invention, the multi-limb sealing ring can be accurately positioned, and the problem that accumulated water breaks through the sealing line of the multi-limb sealing ring and enters the interior of the oil film bearing can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to a sealing structure for an oil film bearing of a rolling mill, and more particularly to a sealing mechanism for an oil film bearing on a roll shaft of a rolling mill. Background Art

[0002] When a roll of a large rolling mill in a steel enterprise is working, the rolling force it bears is relatively large. Generally, an oil film bearing is used to provide strong support for both ends of the roll shaft. The oil film bearing is installed in a bearing housing. During operation, a good oil supply environment is required to provide lubrication and support. This requires a reliable sealing device to be provided between the fixed bearing housing and the rotating end face of the roll to resist the intrusion of a large amount of external cooling water, scale and other impurities, and at the same time prevent the leakage of internal grease.

[0003] In existing oil film bearing sealing devices, the DF-type sealing structure is mostly used. This sealing structure mainly consists of a sealing cover 1, a water seal 2, an aluminum ring 3 and a multi-limb sealing ring 4. The sealing cover is installed on the bearing housing 5, the water seal 2 is installed on the sealing cover 1 and is fixed relative to the bearing housing 5. The multi-limb sealing ring 4 is sleeved on the conical surface of the roll neck of the roll 6 and rotates with the conical sleeve 7 and the aluminum ring 3 of the oil film bearing in the bushing 8 of the oil film bearing, together with the sealing cover 1 and the water seal 2 to form an oil film bearing sealing device integrating dynamic sealing, static sealing and labyrinth sealing. Among them, the aluminum ring 3 abuts against the end face of the roll 6 through several rubber nails 9 evenly distributed in the circumferential direction. The inner edge of the aluminum ring 3 abuts against the roots of the water sealing limbs 41 and the secondary lips 42 of the multi-limb sealing ring 4, and together with the conical sleeve 7, the axial positioning of the multi-limb sealing ring is realized. The second function of the aluminum ring 3 is to form a labyrinth seal with the sealing cover 1 and the water seal 2, etc., making the path of the cooling water breaking through the water seal line reach the water sealing lip of the multi-limb sealing ring 4 tortuous. The third function of the aluminum ring 3 is to throw the water entering the inner edge part of the aluminum ring away from the inner edge to the outer edge of the aluminum ring under the action of its own guiding surface and centrifugal force during the rotation with the roll 6, thereby relieving the water sealing pressure of the multi-limb sealing ring. However, the following deficiencies are found in the use of this aluminum ring structure: First, the strength of the rubber nails of the aluminum ring is insufficient and is easily squeezed and crushed, eventually resulting in inaccurate positioning of the multi-limb sealing ring and sealing failure. Second, when there is more water inlet, the labyrinth sealing and water throwing functions of the aluminum ring are very limited, and a large amount of accumulated water is likely to break through the sealing line of the multi-limb sealing ring and enter the interior of the oil film bearing, damaging the safe operation of the oil film bearing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sealing mechanism for an oil film bearing on a roll shaft of a rolling mill. After applying the present invention, the multi-limb sealing ring can be accurately positioned and can effectively prevent the accumulated water in the water absorption cavity from breaking through the sealing line of the multi-limb sealing ring and entering the interior of the oil film bearing.

[0005] In order to solve the above technical problems, the present invention provides a sealing mechanism for an oil film bearing on a roller shaft, comprising a sealing cover, a water seal, an aluminum ring and a multi-limb sealing ring, wherein the sealing cover is mounted on the end of the oil film bearing seat, the water seal is sealed in the end of the sealing cover to form a water seal between the sealing cover and the end face of the roller, the multi-limb sealing ring is sleeved on the roller neck conical surface of the roller, the aluminum ring has a "J"-shaped cross section and has an annular plate, an annular guide plate is connected to the inner circumference of one side of the annular plate, and an L-shaped baffle is connected to the outer circumference, and the end of the guide plate is The aluminum ring abuts against the multi-limb sealing ring, the space between the aluminum ring, the multi-limb sealing ring and the sealing cover forms a water accumulation chamber, the space between the aluminum ring, the multi-limb sealing ring and the cone surface of the roller neck forms a water absorption chamber, the space between the water seal, the aluminum ring and the end face of the roller forms a drainage chamber, the other side of the annular plate is evenly spaced with centrifugal blades along the circumferential direction, each centrifugal blade is sheathed with a rubber buffer pad matching the external contour of the centrifugal blade, and the aluminum ring abuts against the end face of the roller through the rubber buffer pad outside the centrifugal blade on the other side of its annular plate.

[0006] In the present invention, after the rubber buffer pad is mounted on the centrifugal blade, it has strong rigidity, has a large contact area with the end face of the roller, and will not fall off due to extrusion and shearing, so that the multi-limb sealing ring can be accurately positioned, and the problem of sealing failure of the multi-limb sealing ring due to inaccurate positioning will not be caused; the centrifugal blades on the aluminum ring plate and the end face of the roller are fitted together to form a closed impeller structure. When the aluminum ring rotates at a high speed in a predetermined direction together with the roller, a working effect of a centrifugal water pump is generated, and the accumulated water in the water suction chamber is thrown away by the centrifugal blades into the drainage chamber, and finally flows out from the opening at the bottom of the water seal, thereby avoiding the phenomenon that a large amount of accumulated water breaks through the sealing defense line of the multi-limb sealing ring and enters the inside of the oil film bearing.

[0007] As an improvement of the present invention, a water hole is provided on the guide plate.

[0008] As a further improvement of the present invention, the number of the water holes on the guide plate is equal to the number of the centrifugal blades on the annular plate, and the positions of the water holes on the guide plate correspond to the positions of the centrifugal blades on the annular plate.

[0009] By adopting the technical feature of opening water holes on the guide plate, the number of which is equal to that of the centrifugal blades and the positions of which are corresponding, the accumulated water in the water accumulation chamber can evenly pass through the guide plate through the water holes to reach the water absorption chamber under the negative pressure generated by the water absorption chamber, and finally be thrown to the drainage chamber by the centrifugal blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] Figure 1 It is a schematic diagram of the sealing mechanism of the oil film bearing on the roller shaft in the prior art.

[0012] Figure 2 It is a schematic diagram of the sealing mechanism of the oil film bearing on the roller shaft of the rolling mill of the present invention.

[0013] Figure 3 It is a schematic diagram of the structure of the aluminum ring in the present invention.

[0014] Figure 4 yes Figure 3 AA section enlarged schematic diagram. DETAILED DESCRIPTION

[0015] See also Figure 1 - Figure 4 ,in Figure 1 The sealing mechanism of the oil film bearing on the roller shaft in the prior art is a schematic diagram. The sealing mechanism of the oil film bearing on the roller shaft in the prior art mainly includes a sealing cover 1, a water seal 2, an aluminum ring 3 and a multi-limb sealing ring 4. The sealing cover 1 is installed at the end of the oil film bearing seat 5. Figure 1 7 is a tapered sleeve of the oil film bearing, 8 is a bushing of the oil film bearing, the water seal 2 is installed at the end of the sealing cover to form a water seal between the sealing cover and the end face of the roller 6, and the multi-limb sealing ring 4 is sleeved on the roller neck conical surface of the roller 6. Figure 1 41 is the water-sealing limb, and 42 is the auxiliary lip. The cross section of the aluminum ring 3 is in the shape of a Chinese character "几", and has an annular plate 31. An annular guide plate 32 is connected to the inner circumference of one side of the annular plate, and an L-shaped baffle plate 33 is connected to the outer circumference. The end of the guide plate abuts against the multi-limb sealing ring 4. The space between the aluminum ring 3, the multi-limb sealing ring 4 and the sealing cover 1 forms a water accumulation chamber 101. The space between the aluminum ring 3, the multi-limb sealing ring 4 and the cone surface of the roller neck of the roller 6 forms a water absorption chamber 102. The space between the water seal 2, the aluminum ring 3 and the end face of the roller 6 forms a drainage chamber 103. The main difference between the present invention and the prior art is the structure of the aluminum ring 3. In the above-mentioned prior art, the aluminum ring 3 abuts against the end face of the roller 6 through a number of rubber nails 9 evenly distributed on the other side of the annular plate. For the specific structure of the aluminum ring 3 in the present invention, please refer to Figure 2 , Figure 3 and Figure 4 The other side of the annular plate 31 in the aluminum ring 3 is evenly spaced with centrifugal blades 34 along the circumferential direction, and each centrifugal blade is covered with a rubber cushion 35 matching the outer contour of the centrifugal blade. The aluminum ring 3 is pressed against the end face of the roller 6 through the rubber cushion 35 outside the centrifugal blades 34 on the other side of the annular plate 31. The guide plate 32 is provided with water holes 36. The number of water holes 36 on the guide plate 32 is equal to the number of centrifugal blades 34 on the annular plate 31, and the position of the water holes on the guide plate corresponds to the position of the centrifugal blades on the annular plate.

Claims

1. A sealing mechanism for an oil film bearing on a roll shaft, comprising a sealing cover (1), a water seal (2), an aluminum ring (3) and a multi-limb sealing ring (4). The sealing cover (1) is installed at the end of the bearing seat (5) of the oil film bearing. The water seal (2) is installed at the end of the sealing cover to form a water seal between the sealing cover and the end face of the roll (6). The multi-limb sealing ring (4) is sleeved on the tapered surface of the roll neck of the roll (6). The cross-section of the aluminum ring (3) is in the shape of "ji", having an annular plate (31). An annular guide plate (32) is connected to the inner circumference on one side of the annular plate, and a baffle plate (33) with an L-shaped cross-section is connected to the outer circumference. The end of the guide plate abuts against the multi-limb sealing ring (4). A water accumulation cavity (101) is formed in the space between the aluminum ring (3), the multi-limb sealing ring (4) and the sealing cover (1). A water absorption cavity (102) is formed in the space between the aluminum ring (3), the multi-limb sealing ring (4) and the tapered surface of the roll neck of the roll (6). A drainage cavity (103) is formed in the space between the water seal (2), the aluminum ring (3) and the end face of the roll (6). It is characterized in that: On the other side of the annular plate (31), centrifugal blades (34) are evenly distributed at intervals along the circumferential direction. A rubber buffer pad (35) matching the external contour shape of each centrifugal blade is sleeved outside each centrifugal blade. The aluminum ring (3) abuts against the end face of the rolling roll (6) through the rubber buffer pad (35) outside the centrifugal blades (34) on the other side of its annular plate (31).

2. The sealing mechanism of the oil film bearing on the roll shaft as described in claim 1, characterized in that: Water passing holes (36) are provided in the guide plate (32).

3. The sealing mechanism of the oil film bearing on the roll shaft according to claim 2, characterized in that: The number of the water passing holes (36) in the guide plate (32) is equal to the number of the centrifugal blades (34) on the annular plate (31), and the positions of the water passing holes on the guide plate correspond to the positions of the centrifugal blades on the annular plate.

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