A bearing extractor and a bearing drawing method

Abstract

The application relates to a bearing puller and a bearing drawing method. The bearing puller comprises a hydraulic cylinder, a connecting disc, a plurality of puller claws, a pressing disc and a vibration generator. The connecting disc comprises a connecting body, a plurality of cantilever arms, a plurality of supporting legs and a mounting hole. The connecting body is disc-shaped, and the mounting hole is formed on the connecting body and used for fixing the hydraulic cylinder. The outer edge of the bottom of the connecting body extends radially outward to form the cantilever arms, and the outer edge of the bottom of the connecting body extends downward to form the supporting legs. The bottom of the puller claw is inwardly provided with a force applying boss which is adapted to be engaged with a force applying groove of a bearing to be drawn. The pressing disc comprises a pressing disc body, a limiting step and an annular column surface. The vibration generator is fixed to the bottom surface of the pressing disc body. The damping pull rod is arranged between the connecting disc and the pressing disc. The application provides the bearing puller and the bearing drawing method, which are convenient for pulling out the inner ring of the bearing, reduce the operation difficulty and are safe and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine assembly, and particularly relates to a bearing extractor and a bearing drawing method. BACKGROUND

[0002] In order to ensure installation accuracy, the bearing at the rotor of an aero-engine is generally in interference fit, and the inner ring of the bearing is heated or the rotor shaft is cooled to realize assembly of the bearing inner ring. However, when the bearing inner ring needs to be disassembled, especially after engine test run is completed, the disassembly force of the bearing inner ring is huge, and the bearing is difficult to pull out.

[0003] The prior art generally adopts a form that a threaded transmission drives a pull claw to pull out the bearing. However, this method needs large manpower, has large operation difficulty, and the pull claw has large deformation in the force application process. The deformation is restored instantaneously at the moment of pulling out the bearing inner ring, and the bearing inner ring is easily bounced out, which can easily cause damage. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a bearing extractor and a bearing drawing method, which facilitates pulling out of the bearing inner ring, reduces operation difficulty, and is safe and reliable.

[0005] Specifically, the present application provides a bearing extractor, which comprises:

[0006] a hydraulic cylinder;

[0007] a connecting disc comprising a connecting body, a cantilever, a supporting leg and a mounting hole, the connecting body is disc-shaped, the mounting hole is formed on the connecting body, the hydraulic cylinder is fixed on the connecting body through the mounting hole, a plurality of cantilevers are extended outward in the radial direction from the outer edge of the bottom of the connecting body, and a plurality of supporting legs are extended downward from the outer edge of the bottom of the connecting body;

[0008] a plurality of pull claws, the top of the pull claw is provided with an assembly hole, the assembly hole is fixed in cooperation with the cantilever, the bottom of the pull claw is formed with a force application boss inward, the force application boss is suitable for clamping with a force application groove of a bearing to be drawn, and a plurality of pull claws are enclosed in the connecting disc;

[0009] a pressure disc comprising a pressure disc body, a limiting step and an annular column, the limiting step is formed on the top of the pressure disc body and fixed in cooperation with the shape of the bottom of the supporting leg, the annular column is downwardly extended on the bottom of the pressure disc body, and the bottom of the annular column is matched with the inner surface of a rotor on which the bearing is assembled;

[0010] a vibration generator fixed on the bottom surface of the pressure disc body;

[0011] a damping pull rod arranged between the connecting disc and the pressure disc, one end of the damping pull rod is fixedly connected with the connecting disc, and the other end of the damping pull rod is fixedly connected with the pressure disc.

[0012] According to one embodiment of the present application, the mounting hole edge of the connecting body is internally threaded, the bottom of the hydraulic cylinder is fixedly screwed with the mounting hole, and the piston rod of the hydraulic cylinder extends into the mounting hole and is attached to the top surface of the pressure plate.

[0013] According to one embodiment of the present application, the cross section of the cantilever is rectangular, the assembly hole of the puller jaw is matched with the cantilever, and the puller jaw is adapted to move in the radial direction of the connecting plate for assembly.

[0014] According to one embodiment of the present application, the bearing puller further comprises a limiting ring, the bottom outer edge of the puller jaw is formed with a limiting arc surface, the limiting ring is adapted to be sleeved outside a plurality of puller jaws, and the limiting ring is fixedly matched with the limiting arc surface to limit the radial and axial movement of the puller jaw.

[0015] According to one embodiment of the present application, a first connecting hole is arranged on the connecting body, a second connecting hole is arranged on the pressure plate body, the top end of the damping pull rod is fixedly screwed with the first connecting hole through a first screw, and the bottom end of the damping pull rod is fixedly screwed with the second connecting hole through a second screw.

[0016] According to one embodiment of the present application, three damping pull rods are arranged between the connecting body and the pressure plate body, and the length direction of the damping pull rods is consistent with the pulling direction of the bearing puller.

[0017] According to one embodiment of the present application, the distance between the three top ends of the three damping pull rods is equal, and the centers of the three top ends are located on the axis of the connecting body.

[0018] According to one embodiment of the present application, a third connecting hole is arranged on the pressure plate body, and the vibration generator is fixedly screwed with the third connecting hole through a third screw.

[0019] According to one embodiment of the present application, the bearing puller further comprises an elastic washer, and the vibration generator is fixed on the bottom surface of the pressure plate body through the third screw and the elastic washer.

[0020] The present application also provides a bearing pulling method, which is suitable for the bearing puller described above, and a bearing inner ring is interference-fitted on a rotor, the upper periphery of the bearing inner ring is provided with a force applying groove, and the bearing pulling method comprises the following steps:

[0021] S1, the vibration generator is fixed to the pressure plate, the connecting plate is connected with the pressure plate through the damping pull rod, the connecting plate and the pressure plate are pressed against each other, the damping pull rod is shortened, and the supporting leg is in contact with the limiting step;

[0022] S2, put the pressure disc into the rotor, and fix the annular cylindrical surface to the inner wall of the rotor;

[0023] S3, install a plurality of pullers, the pullers are matched with the cantilever through the assembly hole, are slid along the radial direction of the connecting disc, and are fixed by clamping the force application boss of the puller in the force application groove;

[0024] S4, fix the hydraulic cylinder to the connecting disc through the mounting hole of the connecting body, and make the piston rod of the hydraulic cylinder pass through the mounting hole and abut against the top surface of the pressure disc;

[0025] S5, start the vibration generator, the hydraulic cylinder continues to apply pressure, the bearing inner ring is gradually pulled out, and the damping pull rod is gradually lengthened;

[0026] S6, at the moment when the bearing inner ring is separated from the rotor, the damping pull rod applies damping effect to avoid the bearing inner ring from bouncing out;

[0027] S7, complete the disassembly of the bearing inner ring, and unload the bearing puller.

[0028] The bearing puller and the bearing pulling method provided by the application facilitate the pulling out of the bearing inner ring on the rotor, reduce the operation difficulty, and are safe and reliable.

[0029] It should be understood that the above general description and the following detailed description of the application are exemplary and illustrative, and are intended to provide further explanation of the application described. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the application, and they are collected and constitute a part of the application, the drawings show embodiments of the application, and together with the specification, they play a role in explaining the principles of the application.

[0031] In the drawings:

[0032] Figure 1 The assembly schematic view of the bearing puller of one embodiment of the application is shown.

[0033] Figure 2 The use state view of the bearing puller of one embodiment of the application is shown.

[0034] Figure 3 is Figure 2 The structure schematic view of the bearing inner ring and the rotor in

[0035] Figure 4A The structure schematic view of the connecting disc of the bearing puller of one embodiment of the application is shown.

[0036] Figure 4BA partial sectional view of a connecting disc of a bearing extractor is shown.

[0037] Figure 5 A structural schematic view of a pull claw of a bearing extractor is shown.

[0038] Figure 6A A structural schematic view of a pressing disc of a bearing extractor is shown. Figure 1 .

[0039] Figure 6B A structural schematic view of a pressing disc of a bearing extractor is shown. Figure 2 .

[0040] Figure 7 A flow chart of a bearing extraction method is shown.

[0041] bearing extractor 100

[0042] hydraulic cylinder 101

[0043] connecting disc 102

[0044] pull claw 103

[0045] pressing disc 104

[0046] vibration generator 105

[0047] damping pull rod 106

[0048] connecting body 107

[0049] cantilever 108

[0050] foot 109

[0051] mounting hole 110

[0052] assembly hole 111

[0053] force applying boss 112

[0054] pressing disc body 113

[0055] limiting step 114

[0056] annular cylindrical surface 115

[0057] limiting ring 116

[0058] first connecting hole 117

[0059] second connecting hole 118

[0060] first screw 119

[0061] Second screw 120

[0062] Third connecting hole 121

[0063] Third screw 122

[0064] Elastic washer 123

[0065] Limiting camber 124

[0066] Bearing inner ring 201

[0067] Rotor 202

[0068] Force applying groove 203 DETAILED DESCRIPTION

[0069] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict.

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0071] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0072] The foregoing is a summary and thus contains only the most basic embodiment. The application can be practiced with the specific embodiments and options described herein, and it can also be practiced without such specific embodiments and options. Furthermore, the foregoing summary should not limit the scope of the application to a single feature or option described herein. Accordingly, no single feature or option is a requisite for a practice of the application. Unless otherwise specifically explained herein, the relative arrangements of parts, sequences of processes, numerical expressions, and values stated in these embodiments are not meant to limit the scope of the present application. Also, it is understood that the dimensions of the various parts shown in the drawings are not drawn to scale. Techniques, methods, and devices known to those of ordinary skill can not be discussed in detail because such can be understood by persons skilled in the relevant art. In the examples shown and discussed herein, any specific values are to be interpreted as merely exemplary, and not limiting. Other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters refer to like parts throughout the several views of the drawings and, as such, no further discussions on such will be separately undertaken since such will be understood from the description below.

[0073] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", and "top", "bottom" are generally based on the orientation or positional relationships shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the parts themselves.

[0074] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned at 90 degrees or in other orientations in other different ways, and the spatial relative descriptions used herein should be interpreted accordingly.

[0075] Moreover, it needs to be explained that the use of the words "first", "second" and the like is merely intended to distinguish the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, although the terms used in the present application are selected from commonly known terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and the detailed meanings thereof are described in the relevant part of the description. In addition, the present application is required to be understood not only by the actual terms used, but also by the meaning implied by each term.

[0076] Figure 1 The assembly diagram of the bearing extractor of one embodiment of the present application is shown. Figure 2 The use state diagram of the bearing extractor of one embodiment of the present application is shown. Figure 3 Figure 2 The structural diagram of the bearing inner ring and the rotor in the bearing extractor. As shown in the figure, a bearing extractor 100 mainly comprises a hydraulic cylinder 101, a connecting disc 102, a plurality of pull claws 103, a pressing disc 104, a vibration generator 105 and a damping pull rod 106. Referring to Figure 2 and Figure 3 The assembly of the bearing inner ring 201 is mainly achieved by heating the bearing inner ring 201 or cooling the rotor 202, and the force applying groove 203 is arranged on the bearing inner ring 201. The bearing extractor 100 provided by the present application is mainly used for assembling to the rotor 202 and the bearing inner ring 201, and the purpose is to pull the bearing inner ring 201 away from the rotor 202.

[0077] Figure 4A The structural diagram of the connecting disc of the bearing extractor of one embodiment of the present application is shown. Figure 4B The partial sectional view of the connecting disc of the bearing extractor of one embodiment of the present application is shown. As shown in Figure 1 , the connecting disc 102 comprises a connecting body 107, a cantilever 108, a supporting leg 109 and a mounting hole 110. The connecting body 107 is disc-shaped, and the mounting hole 110 is formed on the connecting body 107, and the hydraulic cylinder 101 is fixed on the connecting body 107 through the mounting hole 110. A plurality of cantilevers 108 extend radially outward from the outer edge of the bottom of the connecting body 107, and a plurality of supporting legs 109 extend downward from the outer edge of the bottom of the connecting body 107.

[0078] Figure 5 The structural diagram of the pull claw of the bearing extractor of another embodiment of the present application is shown. As shown in the figure, the top of the pull claw 103 is provided with an assembly hole 111, and the assembly hole 111 is fixed in cooperation with the cantilever 108. The bottom of the pull claw 103 is inwardly formed with a force applying boss 112, and the force applying boss 112 is adapted to be engaged with the force applying groove 203 of the bearing inner ring 201 to be pulled. A plurality of pull claws 103 are enclosed in the connecting disc 102.​

[0079] Figure 6A Structure diagram of the pressing plate of the bearing extractor Figure 1 . Figure 6B Structure diagram of the pressing plate of the bearing extractor Figure 2 . As shown in the figure, the pressing plate 104 comprises a pressing plate body 113, a limiting step 114 and an annular column surface 115. The limiting step 114 is formed on the top of the pressing plate body 113, and cooperates with the shape of the bottom of the leg 109 of the connecting plate 102 to fix and limit the pressing plate 104 in the radial and axial directions. The annular column surface 115 is formed on the bottom of the pressing plate body 113 and extends downward, and the bottom of the annular column surface 115 cooperates with the inner surface of the rotor 202 which is equipped with the bearing inner ring 201.

[0080] The vibration generator 105 is fixed on the bottom surface of the pressing plate body 113. The vibration generator 105 functions to apply vibration energy to loosen the bearing inner ring 201 and the rotor 202.

[0081] The damping pull rod 106 is arranged between the connecting plate 102 and the pressing plate 104. One end of the damping pull rod 106 is fixedly connected with the connecting plate 102, and the other end is fixedly connected with the pressing plate 104.

[0082] The bearing extractor 100 provided by the present application uses the hydraulic cylinder 101 to replace the manual pulling, and the pulling force generated by the hydraulic cylinder 101 is transmitted to the puller 103 through the connecting plate 102. The vibration generator 105 applies vibration energy to loosen the bearing inner ring 201 and the rotor 202. Thus, only a relatively small force is needed to pull out the bearing inner ring 201. In addition, the damping pull rod 106 forms a safety protection to prevent the bearing inner ring 201 from being bounced out due to the deformation recovery at the moment of pulling out, thereby avoiding the harm to the operator.

[0083] Preferably, the mounting hole 110 of the connecting body 107 is formed with an internal thread, the bottom of the hydraulic cylinder 101 is fixedly screwed with the mounting hole 110, and the piston rod of the hydraulic cylinder 101 extends into the mounting hole 110 and is attached to the top surface of the pressing plate 104.

[0084] Preferably, with reference to Figure 4A and Figure 4B , the cross section of the cantilever 108 is rectangular. The assembly hole 111 of the puller 103 cooperates with the cantilever 108, and the puller 103 is adapted to move along the radial direction of the connecting plate 102, which is equivalent to sliding along the cantilever 108 to the center. A plurality of pullers 103 correspond to a plurality of cantilevers 108 one by one, and the plurality of pullers 103 are gathered to the center to complete the assembly of the puller 103.

[0085] Preferably, with reference to Figure 1 , Figure 2 andFigure 5 The bearing extractor 100 further comprises a limiting ring 116. The bottom outer edge of the pull claw 103 forms a limiting arc surface 124, and the limiting ring 116 is adapted to be sleeved on the plurality of pull claws 103. After the plurality of pull claws 103 are assembled in place, the limiting ring 116 is sleeved from above, and the limiting ring 116 is fixed with the limiting arc surface 124 of the pull claw 103 in a shape matching manner to limit the radial and axial movement of the pull claw 103. The force applying boss 112 of the pull claw 103 is firmly clamped with the force applying groove 203.

[0086] Preferably, referring to Figure 1 , Figure 4A , Figure 4B , Figure 6A and Figure 6B , the connecting body 107 is provided with a first connecting hole 117, and the pressure plate body 113 is provided with a second connecting hole 118. The top end of the damping pull rod 106 is fixedly screwed with the first connecting hole 117 by a first screw 119, and the bottom end of the damping pull rod 106 is fixedly screwed with the second connecting hole 118 by a second screw 120.

[0087] Preferably, three damping pull rods 106 are arranged between the connecting body 107 and the pressure plate body 113, and the length direction of the damping pull rods 106 is consistent with the pulling direction of the bearing extractor 100. More preferably, the three top ends of the three damping pull rods 106 are equal in distance from each other, and the centers of the three top ends are located on the axis of the connecting body 107. This structure enables the damping pull rods 106 to apply balanced damping force, preventing accidents from occurring when the bearing inner ring 201 is pulled out.

[0088] Preferably, the pressure plate body 113 is provided with a third connecting hole 121, and the vibration generator 105 is fixedly screwed with the third connecting hole 121 by a third screw 122.

[0089] Preferably, the bearing extractor 100 further comprises a resilient washer 123. The vibration generator 105 is fixed on the bottom surface of the pressure plate body 113 by the third screw 122 and the resilient washer 123. The resilient washer 123 is arranged to strengthen the fastening effect of the third screw 122 and prevent the third screw 122 from loosening.

[0090] The application further provides a bearing pulling method suitable for the bearing extractor 100 described above. Conventionally, the bearing inner ring 201 is assembled on the rotor 202 with interference, and the upper periphery of the bearing inner ring 201 is provided with a force applying groove 203. The bearing pulling method comprises the following steps:

[0091] S1, the vibration generator 105 is fixed to the pressure plate 104, the connecting plate 102 is connected with the pressure plate 104 through the damping pull rod 106, the connecting plate 102 and the pressure plate 104 are pressed against each other, the damping pull rod 106 is shortened, and the supporting leg 109 is in contact with the limiting step 114. When the piston rod of the hydraulic cylinder 101 is in contact with the pressure plate 104, the pressure plate 104 is axially and radially limited, so that the centering of the connecting plate 102 and the pressure plate 104 is maintained.

[0092] S2, the pressure plate 104 is placed in the rotor 202, and the annular cylindrical surface 115 is fixedly attached to the inner wall of the rotor 202.

[0093] S3, a plurality of pull claws 103 are loaded from the side, the pull claws 103 are matched with the cantilever 108 through the assembly hole 111, are slid along the radial direction of the connecting plate 102, and are matched with the force applying protrusions 112 of the plurality of pull claws 103 and the force applying grooves 203. The limiting ring 116 is sleeved from above, the radial and axial movement of the pull claws 103 is limited, the force applying protrusions 112 of the plurality of pull claws 103 are firmly matched with the force applying grooves 203.

[0094] S4, the hydraulic cylinder 101 is fixed to the connecting plate 102 through the mounting hole 110 of the connecting body 107, and the piston rod of the hydraulic cylinder 101 passes through the mounting hole 110 and is attached to the top surface of the pressure plate 104.

[0095] S5, the vibration generator 105 is started, the hydraulic cylinder 101 continues to apply pressure, the bearing inner ring 201 is gradually pulled out, and the damping pull rod 106 is gradually lengthened. Because the pulling-out speed is relatively slow, the damping pull rod 106 does not generate additional resistance.

[0096] S6, at the moment when the bearing inner ring 201 is separated from the rotor 202, the damping pull rod 106 applies damping to avoid the bearing inner ring 201 from bouncing out.

[0097] S7, the bearing puller 100 is unloaded after the bearing inner ring 201 is disassembled.

[0098] The bearing puller and the bearing pulling method provided by the application have the following advantages.

[0099] 1. The hydraulic cylinder is used to pull out the pull claw, and the vibration generator is arranged at the pressure plate, so that the bearing inner ring is vibrated to reduce the sticking during the pulling-out process of the bearing inner ring and reduce the pulling-out force.

[0100] 2. The damping pull rod is arranged between the pressure plate and the connecting plate, the damping pull rod is slowly pulled out during the pulling-out process of the bearing inner ring, the pulling force is small, and the pulling-out force is not additionally increased, but the damping pull rod plays a damping role at the moment when the bearing inner ring is pulled out, so that the pulling force is not released at the moment, and the connecting plate and the bearing inner ring are prevented from bouncing out.

[0101] As will be apparent to those of ordinary skill in the art, various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A bearing extractor, comprising: a hydraulic cylinder; a connecting disc comprising a connecting body, cantilever arms, supporting legs and mounting holes, the connecting body being disc-shaped, the mounting holes being formed on the connecting body, the hydraulic cylinder being fixed on the connecting body through the mounting holes, the bottom outer edge of the connecting body extending radially outwardly to form a plurality of cantilever arms, the bottom outer edge of the connecting body extending downwardly to form a plurality of supporting legs; a plurality of pull claws, the top of the pull claws being provided with assembly holes, the assembly holes being fixed with the cantilever arms, the bottom of the pull claws being inwardly formed with force applying bosses, the force applying bosses being adapted to engage with force applying grooves of a bearing to be pulled, the plurality of pull claws being enclosed in the connecting disc; a pressing disc comprising a pressing disc body, a limiting step and an annular cylindrical surface, the limiting step being formed on the top of the pressing disc body and being fixed with the bottom of the supporting legs, the annular cylindrical surface being formed on the bottom of the pressing disc body and extending downwardly, the bottom of the annular cylindrical surface being adapted to engage with the inner surface of a rotor on which the bearing is assembled; a vibration generator being fixed on the bottom surface of the pressing disc body; a damping pull rod being arranged between the connecting disc and the pressing disc, one end of the damping pull rod being fixed with the connecting disc, the other end of the damping pull rod being fixed with the pressing disc.

2. The bearing extractor of claim 1, wherein, The mounting hole edge of the connecting body is formed with internal threads, the bottom of the hydraulic cylinder is fixed with the mounting hole through screw threads, and the piston rod of the hydraulic cylinder extends into the mounting hole and is attached to the top surface of the pressing disc.

3. The bearing extractor of claim 1, wherein, The cross section of the cantilever arm is rectangular, the assembly hole of the pull claw is fixed with the cantilever arm, and the pull claw is adapted to move along the radial direction of the connecting disc for assembly.

4. The bearing extractor of claim 1, wherein Further comprising a limiting ring, the bottom outer edge of the pull claw is formed with a limiting arc surface, the limiting ring is adapted to be sleeved outside the plurality of pull claws, and the limiting ring is fixed with the limiting arc surface to limit the radial and axial movement of the pull claw.

5. The bearing extractor of claim 1, wherein, The connecting body is provided with a first connecting hole, the pressing disc body is provided with a second connecting hole, the top end of the damping pull rod is fixed with the first connecting hole through a first screw, and the bottom end of the damping pull rod is fixed with the second connecting hole through a second screw.

6. The bearing extractor of claim 5, wherein, Three damping pull rods are arranged between the connecting body and the pressing disc body, and the length direction of the damping pull rods is consistent with the pulling direction of the bearing extractor.

7. The bearing extractor of claim 6, wherein, The distances between the three top ends of the three damping pull rods are equal, and the centers of the three top ends are located on the axis of the connecting body.

8. The bearing extractor of claim 1, wherein, The pressing disc body is provided with a third connecting hole, and the vibration generator is fixed with the third connecting hole through a third screw.

9. The bearing extractor of claim 8, wherein, Further comprising an elastic washer, and the vibration generator is fixed on the bottom surface of the pressing disc body through the third screw and the elastic washer.

10. A bearing drawing method suitable for the bearing puller as claimed in claim 1, the bearing inner ring being interference fitted on the rotor, the upper periphery of the bearing inner ring being provided with a force applying groove, characterized in that, The bearing pulling method comprises the following steps: S1, fixing the vibration generator on the pressing disc, connecting the connecting disc with the pressing disc through the damping pull rod, pressing the connecting disc and the pressing disc against each other, and contacting and fixing the supporting legs with the limiting step by shortening the damping pull rod; S2, placing the pressing disc inside the rotor, fixing the annular cylindrical surface with the inner wall of the rotor to form centering of the two. S3, multiple pieces of the puller are loaded, the puller is matched with the cantilever through the assembly hole, is slid into along the radial direction of the connecting disc, and the force application boss of the puller is clamped and fixed with the force application groove; S4, the hydraulic cylinder is fixed to the connecting disc through the mounting hole of the connecting body, the piston rod of the hydraulic cylinder is downwardly penetrated through the mounting hole and abuts against the top surface of the pressing disc; S5, the vibration generator is started, the hydraulic cylinder continues to apply pressure, the bearing inner ring is gradually pulled out, and the damping pull rod is gradually lengthened; S6, at the moment when the bearing inner ring is separated from the rotor, the damping pull rod applies damping effect to avoid the bearing inner ring from bouncing out; S7, the disassembly of the bearing inner ring is completed, and the bearing puller is unloaded.

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