Bearing seat shaft head end cover disassembly device and disassembly method

Abstract

The present invention discloses a bearing seat shaft head end cover disassembly device and a disassembly method thereof, and belongs to the technical field of bearing seat assembly. The present invention includes a positioning member and a driving assembly, wherein the driving assembly is symmetrically arranged in two groups, and the two driving assemblies jointly drive the positioning member to move along the axial direction of the shaft head end cover; wherein the driving assembly includes a housing and a cam arranged on the housing, and the rotation of the cam drives the housing to move, thereby driving the movement of the positioning member. The present invention utilizes the bearing seat locking plate as the positioning basis of the entire disassembly device, and applies an axial thrust to the shaft head end cover through the cam design to complete the disassembly of the shaft head end cover. Compared with the traditional disassembly method of repeated knocking, it not only reduces the work intensity and improves the efficiency of disassembly, but also effectively avoids the deformation of the shaft head end cover.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing seat assembly, and more specifically, relates to a bearing seat shaft head end cover disassembly device and a disassembly method thereof. Background Art

[0002] When assembling the working rolls of the 2# galvanized line in the roller room of the Cold Rolling Plant No. 1 of Maanshan Iron & Steel Co., Ltd. Cold Rolling General Plant, the shaft head end cover used to push and pull the rolls during the roll change on the rolling line covered the bolts for disassembling the rolls and the bearing seats. When assembling the rolls, the shaft head end cover of the bearing seat must be removed first. The step on the shaft head end cover and the end hole of the bearing seat are clearance-matched. When the clamping bolts of the shaft head end cover are unscrewed, the shaft head end cover is still connected to the bearing seat because the clearance between the step on the shaft head end cover and the end hole of the bearing seat is small.

[0003] On-site operators usually use a sledgehammer or copper rod to knock the shaft head gap left and right, so that there is a certain gap between the shaft head end cover and the bearing seat, and then use a crowbar to pry on both sides until the shaft head end cover is removed. However, this disassembly method is labor-intensive, unsafe and inefficient; at the same time, long-term use of a sledgehammer and copper rod to knock and swing to remove the shaft head end cover will damage the size or shape of the matching shaft head end cover step and the bearing seat end hole, affecting the matching properties of the step and the bearing seat end hole; in addition, it is also easy to cause deformation of the shaft head end cover, interfering with the production of the draw hook for online roller change. Therefore, it is necessary to design a disassembly device that is safe, efficient and not easy to damage the shaft head end cover.

[0004] After searching, the Chinese patent application No. 20172055448309 discloses a support roller bearing seat disassembly device. The application includes a support plate, a stud bolt tie rod and a hydraulic jack; the back of the support plate is provided with a plurality of reinforcing rib plates, and the reinforcing rib plates are provided with at least two pieces in the horizontal and vertical directions respectively, and the support plate is also provided with a plurality of bolt holes, two horizontal bolt holes are provided on the upper side and two vertical bolt holes are provided on the lower side, for inserting the stud bolt tie rod; the application connects the support plate with the bearing seat through the stud bolt tie rod, and the hydraulic jack is provided between the support plate and the bearing seat, and the pressure is slowly applied to finally pull out the bearing seat. However, the application is for the shaft head end cover, which covers the bolts for disassembling the bearing seat, and the problem of how to safely and efficiently disassemble the shaft head end cover during roller assembly has not been effectively solved. Summary of the invention

[0005] 1. Problems to be solved

[0006] When disassembling the existing bearing seat, the shaft head end cover needs to be repeatedly knocked, which leads to high labor intensity, low disassembly efficiency and easy deformation of the shaft head end cover. The present invention provides a bearing seat shaft head end cover disassembly device and a disassembly method thereof. The technical solution of the present invention can not only complete the disassembly work safely and efficiently, but also is not easy to cause damage to the shaft head end cover.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] A bearing seat shaft head end cover disassembly device of the present invention includes a positioning member and a driving assembly, wherein the driving assembly is symmetrically arranged in two groups, and the two groups of driving assemblies jointly drive the positioning member to move along the axial direction of the shaft head end cover; wherein the driving assembly includes a shell and a cam arranged on the shell, and the rotation of the cam drives the shell to move, thereby driving the movement of the positioning member.

[0010] Furthermore, a first connecting piece is provided on the housing, and the cam is rotatably arranged on the housing via the first connecting piece.

[0011] Furthermore, the driving assembly also includes a support rod, one end of which is connected to the second connecting piece on the shell, and the other end of which is connected to the third connecting piece on the positioning piece.

[0012] Furthermore, a reinforcing rod is provided between the two supporting rods, the reinforcing rod has an arc section, and the connecting end surface between the reinforcing rod and the supporting rod is an inclined surface.

[0013] Furthermore, the shell includes a front plate, a top plate and a side plate, wherein the first connecting member and the second connecting member are both arranged on the front plate, and a slot for installing the cam is also opened on the front plate.

[0014] Furthermore, the positioning member includes a body and a positioning groove formed on the body, two third connecting members are symmetrically arranged on both sides of the positioning groove, and the positioning groove includes a square groove and an arc groove connected to each other.

[0015] Furthermore, the first connecting member, the second connecting member and the third connecting member are all hinge pairs formed by a connecting sleeve and a connecting nut, wherein the coaxiality of the connecting nut and the connecting sleeve of each hinge pair is ≤0.2 mm.

[0016] Furthermore, the axis of the hinge pair on the positioning member is at the same height as the axis of the arc-shaped groove, thereby ensuring that the thrust can act in the axial direction of the shaft head and roller neck.

[0017] Furthermore, the connecting sleeve and the connecting nut of the first connecting member are respectively located on both sides of the notch, and the welding surface between the connecting sleeve of the first connecting member and the shell is a plane, thereby improving the firmness of the welding between the two and at the same time, helping to save space.

[0018] Furthermore, the driving assembly also includes a force-adding rod, both ends of which are respectively connected to corresponding cams. By setting the force-adding rod, the synchronization of the rotation of the two cams can be ensured.

[0019] The method for disassembling the shaft head end cover using the above disassembly device comprises the following steps:

[0020] Step 1: Installation

[0021] The positioning piece is clamped on the step on the shaft head roller neck through the positioning groove, and the housing is clamped on the bearing seat locking plate through the top plate to realize the positioning and installation of the entire disassembly device;

[0022] Step 2: Disassembly

[0023] The cam is driven to rotate by the force rod, and the cam generates an extrusion thrust on the bearing seat locking plate. The reaction force of the extrusion thrust is transmitted to the positioning part through the housing and the support rod. The positioning part pushes the step on the shaft head roller neck, causing the shaft head end cover to generate a thrust relative to the bearing seat, and finally the shaft head end cover is squeezed out of the end hole of the bearing seat to complete the disassembly work.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) A bearing seat shaft head end cover disassembly device of the present invention comprises a drive assembly and a positioning member, wherein the drive assembly is mounted on the bearing seat locking plate through a housing, thereby providing a stable support force point for the entire drive assembly, and the positioning member is clamped at the step of the shaft head roller neck through a positioning groove, and at the same time, the thrust generated on the bearing seat locking plate when the cam rotates is utilized, and the reaction force of the thrust is finally converted into the axial thrust of the shaft head end cover through the transmission of the housing, the support rod and the positioning member, thereby realizing the disassembly of the shaft head end cover; compared with the traditional disassembly method of repeated knocking, the disassembly device of the present invention not only reduces the work intensity and improves the disassembly efficiency, but also effectively avoids the deformation of the shaft head end cover.

[0027] (2) In a bearing seat shaft head end cover disassembly device of the present invention, a positioning groove is provided on the positioning member, and the positioning groove is a U-shaped groove, which includes a square groove and a semicircular groove, wherein the semicircular groove clamps the entire positioning member on the shaft head roller neck. The setting of the square groove ensures the stability of the connection between the positioning member and the shaft head roller neck; at the same time, it also ensures the contact stability between the positioning member and the step on the shaft head roller neck, so that when the positioning member is subjected to force, the shaft head step can provide stable support for it.

[0028] (3) A bearing seat shaft head end cover disassembly device of the present invention, wherein the connecting piece adopts a hinge pair composed of a connecting sleeve and a connecting nut, and a flexible connection is formed by bolts or pins. When the rotating cam pushes the bearing seat locking plate, the shell may be subjected to uneven force. The flexible connection can effectively alleviate the damage to the shaft head end cover device caused by uneven force.

[0029] (4) In a bearing seat shaft head end cover disassembly device of the present invention, the axis of the hinge pair on the positioning member is at the same height as the axis of the arc groove, so that the thrust can act in the axial direction of the shaft head roller neck; at the same time, the welding surface between the connecting sleeve of the first connecting member and the front plate adopts a flattening design, which can improve the welding strength between the two on the one hand, and make the cam closer to the end face of the locking plate on the other hand, so that the overall structure of the cam can be designed to be smaller, thereby ensuring the utilization of space.

[0030] (5) In a bearing seat shaft head end cover disassembly device of the present invention, the force-adding rod is made into a whole and is used to drive the two cams to rotate synchronously at the same time, thereby ensuring the consistency of the rotation of the two cams and avoiding uneven force on the two cams, which may cause the shaft head end cover to tilt, thereby affecting the smooth progress of the disassembly operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a bearing seat shaft head end cover disassembly device of the present invention;

[0032] Figure 2 It is a schematic diagram of the assembly between the cam and the housing in the present invention;

[0033] Figure 3 It is a structural schematic diagram of the housing in the present invention;

[0034] Figure 4 is a side view of the housing in the present invention;

[0035] Figure 5 It is a structural schematic diagram of the positioning member in the present invention;

[0036] Figure 6 is a side view of the positioning member in the present invention;

[0037] Figure 7 It is a structural schematic diagram of the reinforcing rod in the present invention;

[0038] Figure 8 It is a structural schematic diagram of the force adding rod in the present invention;

[0039] Fig. 9 It is a schematic diagram of the installation of the disassembly device of the present invention.

[0040] In the figure: 11, shaft head roll neck; 12, bearing seat locking plate;

[0041] 2. drive assembly; 21. housing; 211. front plate; 212. top plate; 213. side plate; 214. notch;

[0042] 22. Cam; 23. Support rod; 24. First connecting member; 25. Second connecting member; 26. Reinforcement rod; 261. Arc segment; 27. Force rod;

[0043] 3. Positioning member; 31. Main body; 32. Positioning groove; 321. Square groove; 322. Arc groove; 33. Third connecting member. DETAILED DESCRIPTION

[0044] As described in the background technology, in order to solve the problem of manually knocking to complete the disassembly of the shaft head end cover, it is necessary to first find a suitable force application point. This force application point not only needs to provide stable support for the disassembly tool, but also needs to ensure that the thrust applied is as consistent as possible with the axis of the shaft head end cover to prevent damage to the shaft head end cover and cause deformation. According to the structural characteristics of the bearing seat, two symmetrically arranged locking plates on the bearing seat are selected as the force application point, and the center lines of the two locking plates are consistent with the axial direction of the shaft head end cover. A bearing seat shaft head end cover disassembly device of the present invention uses the bearing seat locking plate as the installation support point and the step on the shaft head roller neck as the force point. By applying external force, the step of the shaft head roller neck is subjected to axial thrust, thereby completing the disassembly of the shaft head end cover.

[0045] The present invention is further described below in conjunction with specific embodiments.

[0046] Example 1

[0047] A bearing seat shaft head end cover disassembly device according to the present embodiment includes a drive assembly 2 and a positioning member 3, wherein the drive assembly 2 is symmetrically arranged in two groups, and the two groups of drive assemblies 2 jointly drive the positioning member 3 to move along the axial direction of the shaft head end cover; the positioning member 3 is positioned and matched with the shaft head end cover on the one hand, and is used to connect with the drive assembly 2 on the other hand to transmit the driving force of the drive assembly 2 to the positioning member 3, thereby completing the disassembly of the shaft head end cover.

[0048] refer to Figure 1 , Figure 2 , Fig. 9As shown, the driving assembly 2 includes a housing 21, a cam 22 and a support rod 23. The housing 21 is mounted on the bearing seat locking plate 12, thereby providing a stable support point for the entire driving assembly 2. The cam 22 is rotatably arranged in the housing 21, and the support rod 23 is used to complete the connection between the housing 21 and the positioning member 3; the positioning member 3 is clamped at the step of the shaft head roll neck 11. In addition, the driving assembly 2 also includes a force rod 27, the two ends of which are respectively connected to the corresponding cams 22, and are used to drive the two cams 22 to rotate synchronously.

[0049] The bearing seat shaft head end cover disassembly device of this embodiment rotates the cam 22 so that the cam 22 generates a pushing force on the bearing seat locking plate 12, and the reaction force of the pushing force is transmitted to the positioning member 3 through the housing 21 and the support rod 23. The positioning member 3 is clamped at the step of the shaft head roll neck 11, so that the shaft head end cover generates a thrust relative to the bearing seat, and finally the shaft head end cover is squeezed out of the end hole of the bearing seat to complete the disassembly work.

[0050] Specifically, refer to Figure 3 , Figure 4 As shown, the shell 21 in this embodiment is welded by three steel plates, namely a front plate 211, a top plate 212 and a side plate 213, and the joints between the plates are processed with mutually matching grooves, which are preferably 4*45° grooves.

[0051] The front plate 211 is provided with a first connecting member 24 and a second connecting member 25. The cam 22 is rotatably mounted on the front plate 211 through the first connecting member 24, thereby ensuring that there is a rotational space for movement between the cam 22 and the locking plate. When the cam 22 rotates, one end of the cam 22 can abut against the bearing seat locking plate 12 to generate a certain thrust. The second connecting member 25 is used to connect the support rod 23. A notch 214 is also machined on the front plate 211, and the cam 22 is mounted on the notch 214 through the first connecting member 24.

[0052] The main function of the top plate 212 is to complete the installation and positioning between the housing 21 and the bearing seat locking plate 12, and to clamp the top plate 212 above the bearing seat locking plate 12 to provide a stable support point for the housing 21; at the same time, to ensure that the central axis of the entire drive assembly 2 is basically consistent with the axis of the shaft head.

[0053] The side plate 213 is used to position the housing 21 on the side of the bearing seat locking plate 12 on the one hand; on the other hand, it plays a role in providing strength support for the lateral force generated when the housing 21 is subjected to force.

[0054] like Figure 5 , Figure 6As shown, the positioning member 3 includes a body 31 and a positioning groove 32 provided on the body 31. The positioning groove 32 is a U-shaped groove as a whole, which includes a square groove 321 and an arc groove 322. Among them, the arc groove 322 is preferably a semicircular groove, which is used to clamp the entire positioning member 3 on the shaft head roll neck 11. The setting of the square groove 321 ensures the stability of the clamping between the positioning member 3 and the shaft head roll neck 11; at the same time, it ensures the contact stability between the positioning member 3 and the step on the shaft head roll neck 11, so that when the positioning member 3 is subjected to force, the shaft head step can provide stable support for it.

[0055] In addition, the positioning member 3 is further provided with a third connecting member 33 for connecting the support rod 23 . Two third connecting members 33 are provided and are symmetrically arranged on both sides of the positioning groove 32 .

[0056] Specifically in this embodiment, the cam 22 is elliptical in shape, and the surface of the elliptical cam 22 is quenched to increase the hardness of the surface of the cam 22 and improve the wear resistance of the cam 22. At the same time, a handle is provided on the cam 22 for driving the cam 22, and a mounting hole is also provided on the handle for mounting the force adding rod 27.

[0057] The first connecting member 24, the second connecting member 25 and the third connecting member 33 are all hinge pairs formed by connecting sleeves and connecting nuts. The coaxiality between the connecting nut and the connecting sleeve of each hinge pair is ≤0.2 mm to prevent interference during assembly.

[0058] The axis of the hinge pair on the positioning member 3 is at the same height as the axis of the arc groove 322 , so that the thrust can act on the axis in the axial direction of the head roll neck 11 .

[0059] The connecting sleeve and the connecting nut of the first connecting member 24 are respectively located on both sides of the slot 214 , and the cam 22 can be rotatably connected with the connecting sleeve and the connecting nut through a pin shaft. At the same time, the driving part of the cam 22 extends into the shell 21 through the slot 214 , and the handle part is located outside the shell 21 .

[0060] In addition, the connecting sleeve of the first connecting member 24 is flattened, that is, the welding surface between the connecting sleeve of the first connecting member 24 and the front plate 211 is a plane. This design can improve the welding strength between the two, and on the other hand, it can make the cam 22 closer to the end face of the locking plate, and the overall structure of the cam 22 can be designed to be smaller, thereby ensuring the utilization of space.

[0061] The support rod 23 is For a steel pipe with an outer diameter and wall thickness of 3mm, since the shaft end cover and the end hole of the bearing seat are clearance fit, the axial force for disassembling the shaft end cover is mainly the friction and torque between the end hole of the bearing seat and the end cover generated by the gravity of the shaft end cover. This type of steel pipe can already meet the strength requirements of the shaft end cover disassembly bracket.

[0062] The two ends of the support rod 23 are heated and hammered flat, and the thickness of the flat surface is 10mm-0.3 / -0.5mm; at the same time, mounting holes are processed on the flat plane, and then the connection between the support rod 23 and the corresponding threaded pair can be completed by bolts. In addition, in order to ensure that the end of the support rod 23 can be easily inserted between the corresponding connecting nut and the connecting sleeve, the welding size between the connecting nut and the connecting sleeve used to install the support rod 23 is 10+0.3 / +0.1mm. Ensure that the minimum gap between the support rod inserted into the connecting nut and the connecting sleeve is 0.4mm, and the maximum gap is 0.8mm, to prevent interference between the end of the support rod 23 and the connecting nut and the connecting sleeve when force is applied, resulting in damage to the shaft head disassembly device.

[0063] In this embodiment, a hinge pair formed by a connecting sleeve and a connecting nut is used as a connecting member, and a flexible connection is formed by bolts or pins. When the rotating cam 22 pushes the bearing seat locking plate 12, the housing 21 may be subjected to uneven force. The flexible hinge pair formed by the connecting sleeve and the connecting nut can effectively alleviate the damage to the shaft head end cover device caused by uneven force.

[0064] like Figure 8 As shown, the force rod 27 is one of the accessories of the entire drive assembly 2. The round tube design is used to consider that the overall weight is light and has sufficient rigidity to meet the squeezing and pushing force of the shaft head end cover removal. The force rod 27 is made into a whole to drive the two cams 22 at the same time. The reason is that the consistency of the rotation of the two cams 22 is considered to avoid uneven force on the two cams 22, which causes the shaft head end cover to be skewed, thereby affecting the smooth disassembly operation.

[0065] Combination Figure 1 , Figure 7 As shown in the embodiment of the present invention, a bearing seat shaft head end cover disassembly device is provided with a reinforcing rod 26 between the two support rods 23. The reinforcing rod 26 is also made of The steel pipe has a wall thickness of 3mm. In order to ensure the fit between the two ends of the reinforcing rod 26 and the support rod 23, both ends of the reinforcing rod 26 have a certain inclination angle. An arc section 261 is designed near the middle of the reinforcing rod 26. Preferably, the arc section 261 is an R70mm inner arc, and the two ends of the inner arc are R40mm for bend transition. This design is mainly considered to cross The shaft head and neck are also designed to be easy to take.

[0066] The disassembly device of this embodiment is used to disassemble the shaft head end cover, which includes the following steps:

[0067] First, the positioning member 3 is clamped on the step on the shaft head roll neck 11 through the positioning groove 32. Then, the housing 21 is clamped on the bearing seat locking plate 12 through the top plate 212 to achieve the positioning and installation of the entire disassembly device.

[0068] Then, the two cams 22 are driven to rotate synchronously through the force rod 27, and the cam 22 abuts against the end face of the bearing seat locking plate 12, generating a certain extrusion thrust on the bearing seat locking plate 12. The reaction force of the extrusion thrust is transmitted to the positioning member 3 through the housing 21 and the support rod 23. The positioning member 3 pushes the step of the shaft head roller neck 11, so that the shaft head end cover generates a thrust relative to the bearing seat. Since the shaft head end cover and the end hole of the bearing seat are clearance-matched, the resistance between the two is mainly the gravity of the shaft head end cover and the friction force of the end hole of the bearing seat and some torque. When the thrust received at the step of the shaft head roller neck 11 is greater than the axial resistance of the shaft head end cover, the shaft head end cover will be squeezed out from the end hole of the bearing seat, thereby completing the disassembly work.

[0069] The bearing seat shaft head cover disassembly device of the present embodiment uses the bearing seat locking plate 12 as the positioning basis of the entire disassembly device, and applies axial thrust to the shaft head cover through the cam 22 design to complete the disassembly of the shaft head cover. Compared with the traditional disassembly method of repeated knocking, it not only reduces the work intensity and improves the disassembly efficiency, but also effectively avoids the deformation of the shaft head cover.

[0070] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A bearing seat shaft head end cover disassembly device, characterized in that: The invention comprises a positioning member (3) and a driving assembly (2), wherein the driving assembly (2) is symmetrically arranged in two groups, and the two groups of driving assemblies (2) jointly drive the positioning member (3) to move in a horizontal direction; wherein the driving assembly (2) comprises a housing (21) and a cam (22) arranged on the housing (21), and the rotation of the cam (22) drives the housing (21) to move in a horizontal direction; The housing (21) is provided with a first connecting member (24), and the cam (22) is rotatably arranged on the housing (21) via the first connecting member (24); The driving assembly (2) further comprises a support rod (23), one end of which is connected to a second connecting member (25) on the housing (21), and the other end of which is connected to a third connecting member (33) on the positioning member (3); The housing (21) comprises a front plate (211), a top plate (212) and a side plate (213); the first connecting member (24) and the second connecting member (25) are both arranged on the front plate (211); and a notch (214) for installing the cam (22) is also provided on the front plate (211); The connection points between the front plate (211), the top plate (212) and the side plate (213) are all processed with grooves, and the driving part of the cam (22) extends into the housing (21) through the notch (214).

2. A bearing seat shaft head end cover disassembly device according to claim 1, characterized in that: A reinforcing rod (26) is provided between the two supporting rods (23), the reinforcing rod (26) has an arc section (261), and the connecting end surface between the reinforcing rod (26) and the supporting rod (23) is an inclined surface.

3. A bearing seat shaft head end cover disassembly device according to any one of claims 1-2, characterized in that: The positioning member (3) comprises a body (31) and a positioning groove (32) provided on the body (31); two third connecting members (33) are symmetrically arranged on both sides of the positioning groove (32); and the positioning groove (32) comprises a square groove (321) and an arc groove (322) which are connected to each other.

4. A bearing seat shaft head end cover disassembly device according to claim 3, characterized in that: The first connecting member (24), the second connecting member (25) and the third connecting member (33) are all hinge pairs formed by a connecting sleeve and a connecting nut, wherein the coaxiality between the connecting nut and the connecting sleeve of each hinge pair is ≤0.2 mm.

5. A bearing seat shaft head end cover disassembly device according to claim 4, characterized in that: The axis of the hinge pair on the positioning member (3) is at the same height as the axis of the arc-shaped groove (322); the connecting sleeve and the connecting nut of the first connecting member (24) are respectively located on both sides of the notch (214); and the welding surface between the connecting sleeve of the first connecting member (24) and the housing (21) is a plane.

6. A bearing seat shaft head end cover disassembly device according to claim 3, characterized in that: The driving assembly (2) further comprises a force-adding rod (27), both ends of which are respectively connected to corresponding cams (22).

7. A method for disassembling a shaft end cover using the disassembly device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Installation The positioning member (3) is clamped on the step on the shaft head roller neck (11) through the positioning groove (32), and the housing (21) is clamped on the bearing seat locking plate (12) through the top plate (212), so as to realize the positioning and installation work of the entire disassembly device; Step 2: Disassembly The cam (22) is driven to rotate by the force-adding rod (27), and the cam (22) generates a pushing force on the bearing seat locking plate (12). The reaction force of the pushing force is transmitted to the positioning member (3) through the housing (21) and the support rod (23). The positioning member (3) pushes the step on the shaft head roller neck (11), so that the shaft head end cover generates a thrust relative to the bearing seat, and finally the shaft head end cover is squeezed out of the end hole of the bearing seat, thereby completing the disassembly work.

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