Bearing extractor

Abstract

The utility model discloses a bearing extractor, which relates to the technical field of underground maintenance and comprises a support plate, a hanger and a support pillar. The supporting plate is arranged on the outer side of the bearing needing to be pulled out and is parallel to the bearing. A hanging rack and a support pillar are mounted on the base; the two hanging frames are located on the left side and the right side of the bearing correspondingly. The hanging rack comprises a connecting hook which is detachably mounted on the supporting plate and a supporting plate which can extend into the inner side of the bearing and is supported on the inner side surface of the bearing; the connecting hook is fixed on the supporting plate; the top column is arranged in the center of the two hanging frames and is in threaded connection with the supporting plate. One end of the jacking column is propped against the mounting shaft of the bearing by screwing the jacking column; and the other end penetrates through the supporting plate and is fixed with a handle. The bearing is supported from the inner side face of the bearing through the supporting plate, the stress area of the bearing is increased, and bearing deformation or damage caused by local stress is avoided; the screw propulsion of the support pillar provides stable dismounting force, and the damage risk of the shaft body is obviously reduced.

Description

A bearing puller Technical Field

[0001] This utility model relates to the field of downhole maintenance technology, and in particular to a bearing puller. Background Technology

[0002] In underground coal mine maintenance operations, bearings and shafts are usually fitted with an interference fit, making disassembly difficult. Existing puller tools are mostly two-jaw or three-jaw structures. During disassembly, localized force can easily damage the outer ring of the bearing, while the inner ring remains on the shaft. This not only increases the difficulty of subsequent disassembly but may also damage the shaft. Summary of the Invention

[0003] The purpose of this invention is to provide a bearing puller that, through the synergistic action of the symmetrical bracket and the top column, achieves uniform force disassembly of the bearing inner ring, thereby improving disassembly efficiency.

[0004] To achieve the above objectives, this utility model provides a bearing puller, comprising a support plate, a bracket, and a top column; the support plate is disposed on the outside of the bearing to be pulled out and is parallel to the bearing; the bracket and the top column are mounted on it; two brackets are provided, located on the left and right sides of the bearing respectively; the bracket includes a connecting hook detachably mounted on the support plate and a support plate that can extend into the inside of the bearing and support its inner side; the connecting hook is fixed to the support plate; the top column is disposed at the center of the two brackets and is screwed to the support plate; by screwing the top column, one end of the top column abuts against the mounting shaft of the bearing; the other end protrudes from the support plate and is fixed with a handle.

[0005] With the above structure, the bearing is supported from the inner side by the support plate, increasing the force-bearing area and avoiding bearing deformation or damage caused by localized stress. The helical propulsion of the top column provides stable disassembly force, significantly reducing the risk of shaft damage. Through the synergistic effect of the symmetrical brackets and the top column, uniform force disassembly of the bearing inner ring is achieved, improving disassembly efficiency.

[0006] Preferably, multiple limiting grooves are evenly arranged above the support plate; the bracket is installed in any of these limiting grooves. This design allows for adjustment of the bracket's installation position according to bearings of different diameters, thereby increasing the device's applicability.

[0007] Preferably, the support plate has a mountain-shaped structure, higher in the middle and lower on both sides, with the limiting grooves symmetrically arranged along the two inclined surfaces of the support plate. This structural design enhances the structural strength of the mountain-shaped support plate and the arc-shaped transition surface, preventing tool deformation.

[0008] Preferably, the connecting hook has a gate-shaped structure, with its upper part hooked into the limiting groove and its lower part fixed to the support plate. This structure facilitates the fixing and installation of the connecting hook.

[0009] Preferably, the limiting groove is a semi-circular arc-shaped groove, with an arc-shaped transition surface between the upper opening of the groove and the top surface of the support plate. This structural design enhances the structural strength of the mountain-shaped support plate and the arc-shaped transition surface, preventing tool deformation.

[0010] Preferably, the side of the support plate extending into the bottom of the inner side of the bearing has an arc-shaped opening. The arc-shaped openings of the two support plates are positioned opposite each other and form a near-circular shape. The diameter of the near-circular shape is larger than the diameter of the gear shaft, and the arc-shaped opening avoids the gear shaft. This structural design maximizes the contact area between the support plate and the inner side of the bearing, further dispersing stress and preventing damage to the bearing.

[0011] Preferably, the support plate extends to the inner ring of the bearing. With this structural arrangement,

[0012] Preferably, a hammer is slidably mounted on one end of the top column, which protrudes from the support plate. Limiting blocks are fixed vertically on the top column, and the hammer slides vertically between the two limiting blocks. This structural design allows the inner ring to also bear a certain supporting force.

[0013] Preferably, the handle is located at the lower limiting block position. This design reduces the distance between the handle and the threaded hole, preventing the top post from breaking or being damaged when the handle is turned forcefully.

[0014] Preferably, the handle is provided with a socket into which a pry bar can be inserted to extend the handle's length. This design extends the lever arm of the pry bar, significantly reducing operational effort, and is particularly suitable for operations in confined downhole spaces.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] This utility model provides a bearing puller that solves the technical problem of low efficiency and easy deformation or damage to the bearing when pulling it off the gear shaft in the prior art. This utility model achieves uniform force disassembly of the bearing inner ring through the synergistic action of the symmetrical hanger and the top column, thereby improving the disassembly efficiency. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the fit between a bearing puller and a gear shaft according to this utility model;

[0018] Figure 2 is a side sectional view of Figure 1;

[0019] Figure 3 is a magnified view of part A in Figure 2;

[0020] Figure 4 is a structural schematic diagram of a bearing puller according to this utility model;

[0021] Figure 5 is a schematic diagram of the hanging bracket.

[0022] In the diagram, 1 is the support plate, 11 is the threaded hole, 12 is the limiting groove, 2 is the hanger, 21 is the connecting hook, 22 is the support plate, 3 is the top column, 31 is the handle, 311 is the insertion hole, 32 is the limiting block, 4 is the hammer, 8 is the bearing, and 81 is the gear shaft. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] The orientations mentioned in this specification are based on the orientation of the bearing puller of this utility model when it is working normally, and do not limit its orientation during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0025] A bearing puller for removing a bearing 8 from a gear shaft 81, wherein the inner ring of the bearing 8 is fixed to the gear shaft 81, while the outer ring is free.

[0026] Example 1:

[0027] As shown in Figures 1-5, a bearing puller includes a support plate 1, a bracket 2, and a top column 3. The support plate 1 is positioned outside the bearing 8 to be pulled out and is parallel to the bearing 8. The bracket 2 and the top column 3 are mounted on the support plate 1.

[0028] There are two hangers 2, located on the left and right sides of the bearing 8 respectively. The hanger 2 includes a connecting hook 21 that is detachably mounted on the support plate 1 and a support plate 22 that can extend into the inside of the bearing 8 and support its inner side.

[0029] Multiple limiting grooves 12 are evenly arranged on the top of the support plate 1; the connecting hook 21 is installed in any of the limiting grooves 12 for positioning. The support plate 1 has a mountain-shaped structure, higher in the middle and lower on both sides, and the limiting grooves 12 are symmetrically arranged along the two sloping sides of the support plate 1. The sloping surfaces extend its length, maximizing the number of limiting grooves 12. The limiting groove 12 is a semi-circular arc-shaped groove, and an arc-shaped transition surface is provided between the upper groove opening and the top surface of the support plate 1. The mountain-shaped support plate 1 and the arc-shaped transition surface enhance the structural strength and prevent tool deformation.

[0030] The connecting hook 21 has a gate-shaped structure, with its upper part hooked into the limiting groove 12 and its lower part fixed to the support plate 22. The cooperation between the limiting groove 12 and the gate-shaped hook enables the quick positioning of the hanger 2. The installation position of the connecting hook 21 can be adjusted according to bearings 8 of different diameters, thereby increasing the applicability of the device.

[0031] An arc-shaped opening is provided on one side of the support plate 22 that extends into the bottom of the inner side of the bearing 8. The arc-shaped openings of the two support plates 22 are arranged opposite each other and form a near-circular shape. The arc-shaped opening avoids the gear shaft 81. This structure maximizes the contact area between the support plate 22 and the inner side of the bearing 8, further dispersing stress and preventing damage to the bearing 8.

[0032] The support plate 22 can selectively extend to the inner ring of the bearing 8, thereby allowing the inner ring to also bear a certain supporting force. Of course, this setting can be adjusted by selecting different brackets 2 according to the different installation positions and spaces of the bearing 8. Whether the support plate 22 extends to the inner ring of the bearing 8 is not limited in this embodiment.

[0033] The top post 3 is located at the center of the two brackets 2 and is screwed onto the support plate 1. The support plate 1 has a threaded hole 11 at its center. The top post 3 is a bolt post that mates with the threaded hole 11. The top post 3 is screwed into the threaded hole 11. By screwing the top post 3, one end of the top post 3 is pressed against the gear shaft 81 of the bearing 8; the other end protrudes from the support plate 1 and is fixed with a handle 31.

[0034] During installation, hook the two hangers 2 into the corresponding limiting grooves 12 of the support plate 1, and then support the plate 22 on the inner side of the bearing 8; turn the handle 31, and one end of the top column 3 presses against the gear shaft 81 of the bearing 8 to achieve stable installation; continue to turn the handle 31, and the top column 3 gradually applies a stable helical thrust to the gear shaft 81, gradually removing the bearing 8 from the gear shaft 81.

[0035] The bearing 8 is supported from the inner side by the support plate 22, which increases the force-bearing area of ​​the bearing 8 and avoids bearing deformation or damage caused by local force; the spiral propulsion of the top column 3 provides stable disassembly force and significantly reduces the risk of shaft damage.

[0036] Furthermore, the handle 31 is provided with a socket 311, into which a pry bar can be inserted. The pry bar extends the lever arm, greatly reducing the intensity of operation, and is especially suitable for working in narrow spaces downhole.

[0037] Example 2:

[0038] Furthermore, in practical applications, because the bearing 8 and gear shaft 81 have been used for a long time, their connection may become firmly established due to corrosion or other reasons. Forcibly disassembling them could easily damage the bearing 8 and gear shaft 81. Therefore, this embodiment is a further improvement on the first embodiment.

[0039] A hammer 4 is slidably mounted on one end of the top column 3 that protrudes from the support plate 1. Limiting blocks 32 are fixed on the top column 3, and the hammer 4 slides up and down between the two limiting blocks 32.

[0040] When it becomes difficult to turn the handle 31 and it cannot be pushed forward any further, the sliding hammer 4 strikes the limiting block 32, generating a high-frequency vibration force to help loosen the bearing 8. The impact force of the hammer 4 can break the interference fit between the bearing 8 and the gear shaft 81. At the same time, the hammer 4 strikes the limiting block 32 on the side away from the bearing 8. Due to the inertia generated by the impact force, it can drive the support plate 1 to pull the bearing 8 outward. After striking for a while, the handle 31 can be turned again, and the bearing 8 can be disengaged relatively easily. Further optimization of the structure is made by placing the handle 31 at the lower limiting block 32 position. This setting can reduce the distance between the handle 31 and the threaded hole 11, avoiding breakage or damage to the top column 3 when the handle 31 is turned with great force.

[0041] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A bearing puller, characterized in that: The device includes a support plate, a bracket, and a top column. The support plate is positioned on the outside of the bearing to be removed and is parallel to the bearing. The bracket and the top column are mounted on the support plate. There are two brackets, located on the left and right sides of the bearing, respectively. Each bracket includes a connecting hook detachably mounted on the support plate and a support plate that extends into the inside of the bearing and supports its inner surface. The connecting hook is fixed to the support plate. The top column is positioned at the center of the two brackets and is screwed onto the support plate. By screwing the top column, one end of the top column abuts against the mounting shaft of the bearing. Its other end protrudes from the support plate and is fixed with a handle.

2. The bearing puller according to claim 1, characterized in that: Multiple limiting grooves are evenly arranged above the support plate; the hanging bracket is installed in any of the limiting grooves.

3. A bearing puller according to claim 2, characterized in that: The support plate has a mountain-shaped structure with a high center and low sides, and the limiting groove is symmetrically arranged along the two oblique sides of the support plate.

4. A bearing puller according to claim 2, characterized in that: The connecting hook has a gate-shaped structure, with its upper part hooked into the limiting groove and its lower part fixed to the support plate.

5. A bearing puller according to claim 3, characterized in that: The limiting groove is a semi-circular arc groove, and an arc transition surface is provided between the upper groove opening and the top surface of the support plate.

6. A bearing puller according to claim 1, characterized in that: An arc-shaped opening is provided on one side of the support plate that extends into the bottom of the inner side of the bearing. The arc-shaped openings of the two support plates are arranged opposite each other and form a near-circular shape. The diameter of the near-circular shape is larger than the diameter of the gear shaft, and the arc-shaped opening avoids the gear shaft.

7. A bearing puller according to claim 6, characterized in that: The support plate extends to the inner ring of the bearing.

8. A bearing puller according to claim 1, characterized in that: One end of the top column protrudes from the support plate and is fitted with a hammer that slides up and down. Limiting blocks are fixed on the top column, and the hammer slides up and down between the two limiting blocks.

9. A bearing puller according to claim 8, characterized in that: The handle is located at the position of the lower limiting block.

10. A bearing puller according to claim 1, characterized in that: The handle is provided with a socket into which a pry bar can be inserted to extend the length of the handle.

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