Slewing bearing hoisting clamp

Abstract

The invention relates to the technical field of hoisting clamps, and discloses a slewing bearing hoisting clamp. Comprising a threaded screwing mechanism, two elastic pre-tightening mechanisms, a longitudinal hollow shell, a longitudinal telescopic rod and a first spiral spring, wherein the longitudinal telescopic rod can move in the axial direction of the longitudinal hollow shell, the end of the longitudinal telescopic rod can structurally abut against the upper surface of the slewing bearing body, and the first spiral spring is installed in the longitudinal hollow shell and exerts downward elastic acting force on the longitudinal telescopic rod. The slewing bearing hoisting clamp can be screwed into an internal thread hole of a slewing bearing, so that effective connection of the slewing bearing is achieved, and after the slewing bearing hoisting clamp is connected with the slewing bearing, the equipment can enable a pre-tightening effect to be generated between an internal thread structure and an external thread structure, so that the probability that in the hoisting process, the hoisting time is shortened is reduced, and the hoisting efficiency is improved. And the loosening phenomenon between the threads due to mechanical vibration and rotation is avoided, so that the stability and the safety degree of equipment in the working process are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting jigs, and specifically to a swing bearing lifting jig. Background Art

[0002] A swing bearing is a large bearing that can withstand combined loads and can simultaneously bear large axial, radial loads and overturning moments. Swing bearings are widely used in the real industry and are known as the joints of machines. They are important transmission components necessary for machinery that needs to make relative rotational movements between two objects and simultaneously bear axial forces, radial forces, and overturning moments. With the rapid development of the machinery industry, swing bearings have been widely used in industries such as ship equipment, construction machinery, light industry machinery, metallurgical machinery, medical machinery, and industrial machinery. When swing bearings are produced, lifting jigs are needed for movement to facilitate the processing process.

[0003] For example, the Chinese patent with the publication number "CN214114672U" discloses "a swing bearing lifting jig". Its main structure includes a swing bearing, and a fixing mechanism is arranged inside the swing bearing. The fixing mechanism includes a robotic arm. The robotic arm is located inside the swing bearing. A first empty groove is opened on the bottom surface of the robotic arm. A first threaded sleeve is arranged inside the first empty groove. A limiting block is arranged inside the first empty groove. A second threaded sleeve is arranged outside the limiting block. The second threaded sleeve is threadedly connected to the first threaded sleeve. A bottom support is movably connected inside the first empty groove. One end of the bottom support is located outside the robotic arm, and the top surface of the bottom support is connected to the bottom surface of the swing bearing. A second empty groove is opened inside the robotic arm. A spring is fixedly connected inside the second empty groove. The other end surface of the spring is fixedly connected to a resisting block. Through the arranged fixing mechanism, the swing bearing can be better fixed to the robotic arm, and the disassembly is convenient and will not cause damage to the swing bearing. On the basis of improving work efficiency, the swing bearing is well protected.

[0004] However, when the swing bearing is assembled, since the swing bearing needs to be assembled on a platform, and during the assembly process, the inner ring and outer ring of the swing bearing need to be lifted and adjusted. However, the above swing bearing lifting jig needs to dive below the inner ring and outer ring of the swing bearing. At this time, the structure located below the swing bearing will affect its laying flat on the upper surface of the platform, resulting in the inability to assemble the inner ring and outer ring. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a rotary bearing lifting fixture that can be screwed into the internal threaded hole of the rotary bearing to achieve an effective connection to the rotary bearing. Moreover, after being connected to the rotary bearing, the device can cause a pre-tightening effect between the internal threaded structure and the external threaded structure, thereby reducing the occurrence of loosening phenomena between the threads due to mechanical vibration and rotation during the lifting process, and further improving the stability and safety of the device during operation, thus solving the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solution: A rotary bearing lifting fixture includes a first support plate with a lifting ring installed on its upper surface, a hook insertion hole provided in the lifting ring, two second support plates provided on both symmetric sides of the first support plate, a longitudinal connecting rod fixedly installed at the bottom of the second support plate, and a first connecting plate fixedly installed at the bottom of the longitudinal connecting rod. It also includes a threaded screwing mechanism, which internally has a third support plate fixedly installed at the bottom of the two first connecting plates, a first rotating shaft rotatably installed in the third support plate through a bearing, and an external threaded rod fixedly installed at the bottom of the first rotating shaft and capable of being screwed into the internal threaded hole of the rotary bearing; and two elastic pre-tightening mechanisms, which internally have a longitudinal hollow outer shell fixedly installed at the bottom of the threaded screwing mechanism and in a hollow state, a longitudinal telescopic rod capable of axially moving along the longitudinal hollow outer shell and with its end capable of structurally abutting against the upper surface of the rotary bearing body, and a first helical spring installed inside the longitudinal hollow outer shell and exerting a downward elastic force on the longitudinal telescopic rod.

[0007] Preferably, the threaded screwing mechanism includes a third support plate. The center of the third support plate is provided with a first shaft body installation hole with open ends on both sides. On both sides of the third support plate, there are two fourth support plates that are integrally formed with it and in a symmetric state. Inside the first shaft body installation hole of the third support plate, a rotatable first rotating shaft is installed through a bearing. The top of the first rotating shaft is provided with a concave first shaft body fixing groove. The bottom of the first rotating shaft is fixedly installed with a second connecting plate. The bottom of the second connecting plate is fixedly installed with a third connecting plate. The bottom of the third connecting plate is provided with an external threaded rod integrally formed with it.

[0008] Preferably, the rod body of the external threaded rod is provided with an external threaded structure, and this threaded structure matches the internal threaded holes in the inner ring and outer ring of the rotary bearing.

[0009] Preferably, the elastic preload mechanism comprises a longitudinal hollow shell, the top end of the longitudinal hollow shell is provided with a No. 4 connecting plate which is an integral structure with it and fixedly mounted on the bottom end of the No. 4 support plate, the interior of the longitudinal hollow shell is provided with a longitudinal component movable cavity, the bottom end of the longitudinal hollow shell is provided with a No. 1 shaft body through-hole connecting the space below it and the bottom end of the longitudinal component movable cavity, the longitudinal hollow shell is provided with a limit plate which can move axially along the longitudinal component movable cavity inside the longitudinal component movable cavity, a No. 1 coil spring is provided on the top of the limit plate, a longitudinal telescopic rod which passes through the No. 1 shaft body through-hole is fixedly mounted on the bottom end of the limit plate, and a contact head is fixedly mounted on the bottom end of the longitudinal telescopic rod.

[0010] Preferably, the initial length of the No. 1 coil spring is greater than the depth of the movable cavity of the longitudinal component, and one end of the No. 1 coil spring abuts against the top end of the movable cavity of the longitudinal component, and the bottom end abuts against the upper end surface of the limit plate.

[0011] Preferably, the horizontal height of the bottom end of the longitudinal hollow shell is not lower than the horizontal height of the top end of the external threaded rod.

[0012] Preferably, it also includes a torque strength controllable linkage mechanism, which is internally provided with a hollow disk body that can rotate under the twisting action of a wrench, an inner rotating column that can drive the No. 1 rotating shaft to rotate, and an arc-shaped contact plate that can enable the hollow disk body and the inner rotating column to be linked by friction.

[0013] Preferably, the torque strength controllable linkage mechanism comprises a hollow disk body and an inner rotating column, the upper end surface of the hollow disk body is provided with a hexagonal rotating head with an integral structure therewith, the center of the hollow disk body is provided with a columnar component mounting cavity, the center of the bottom end of the hollow disk body is provided with a No. 2 shaft body mounting hole, the shaft body of the No. 2 rotating shaft is installed inside the No. 2 shaft body mounting hole through a bearing, the center of the columnar component mounting cavity is provided with an inner rotating column, the bottom center of the inner rotating column is provided with a No. 2 shaft body fixing groove for installing the No. 2 rotating shaft, the bottom end of the No. 2 rotating shaft is fixedly installed inside the No. 1 rotating shaft, and the hollow disk body is in position A plurality of circular array-type transverse component movable cavities are arranged on the periphery of the cylindrical component mounting cavity, and the transverse component movable cavities and the circumferential side surfaces of the cylindrical component mounting cavity are connected through the No. 1 and No. 2 shaft body through-holes, and the hollow disk body is provided with an inner movable plate capable of axially moving along the cylindrical component mounting cavity, and a No. 2 coil spring is provided at one end of the inner movable plate, and a connecting shaft body penetrating the No. 1 and No. 2 shaft body through-holes is fixedly installed at the other end of the inner movable plate, and an arc-shaped resistance plate that resists the circumferential surface of the inner rotating cylinder is fixedly installed at one end of the connecting shaft body located inside the cylindrical component mounting cavity.

[0014] Preferably, one end of the second helical spring abuts against one end face of the inner movable plate, and the other end abuts against one end face of the transverse component activity cavity, and the second helical spring is in a compressed state.

[0015] Preferably, the structural radius of the concave surface of the arc-shaped abutting plate matches the structural radius of the inner rotating column.

[0016] Compared with the prior art, the present invention provides a swing bearing lifting fixture, which has the following beneficial effects:

[0017] It can be screwed into the internal thread hole of the swing bearing, so as to realize the effective connection of the swing bearing. Moreover, after being connected to the swing bearing, the device can cause a pre-tightening effect between the internal thread structure and the external thread structure, thereby reducing the occurrence of loosening phenomena between the threads due to mechanical vibration and rotation during the hoisting process, and further improving the stability and safety degree of the device during the working process. Description of the Drawings

[0018] Figure 1 is a perspective view of the present invention;

[0019] Figure 2 is a perspective sectional view of the present invention;

[0020] Figure 3 is a perspective view of the threaded screwing mechanism in the present invention;

[0021] Figure 4 is a perspective sectional view of the threaded screwing mechanism in the present invention;

[0022] Figure 5 is a perspective sectional view of the elastic pre-tightening mechanism in the present invention;

[0023] Figure 6 is a perspective sectional view of the torque strength controllable linkage mechanism in the present invention from the first perspective;

[0024] Figure 7 is a perspective sectional view of the torque strength controllable linkage mechanism in the present invention from the second perspective.

[0025] Wherein: 1. First support plate; 2. Hoisting ring; 3. Hook insertion hole; 4. Second support plate; 5. Longitudinal connecting rod; 6. First connecting plate; 7. Threaded screwing mechanism; 71. Third support plate; 72. First shaft mounting hole; 73. Fourth support plate; 74. First rotating shaft; 75. Second connecting plate; 76. First shaft fixing groove; 77. Third connecting plate; 78. External threaded rod; 8. Elastic preloading mechanism; 81. Longitudinal hollow housing; 82. Fourth connecting plate; 83. Longitudinal component moving cavity; 84. First shaft perforation; 85. Limiting plate; 86. First helical spring; 87. Longitudinal telescopic rod; 88. Contact head; 9. Torque strength controllable linkage mechanism; 91. Hollow disk body; 92. Hexagonal rotating head; 93. Cylindrical component mounting cavity; 94. Second shaft mounting hole; 95. Transverse component moving cavity; 96. Second shaft perforation; 97. Inner moving plate; 98. Second helical spring; 99. Arc-shaped contact plate; 910. Inner rotating column; 911. Second shaft fixing groove; 912. Second rotating shaft. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1 and Figure 2 , a swing bearing lifting fixture, including a first support plate 1 with a hoisting ring 2 installed on its upper surface, a hook insertion hole 3 provided in the hoisting ring 2, two second support plates 4 provided on both symmetrical sides of the first support plate 1, a longitudinal connecting rod 5 fixedly installed at the bottom of the second support plate 4, and a first connecting plate 6 fixedly installed at the bottom end of the longitudinal connecting rod 5. Insert the hook of the hoisting equipment into the hook insertion hole 3, and then the hoisting equipment can be started to drive the inner ring or outer ring of the swing bearing to move.

[0028] In order to achieve a threaded connection relationship, thereby reducing the connection contact area and not affecting the assembly work of the inner ring or outer ring of the swing bearing, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, it is necessary to set up a threaded screwing mechanism 7, which internally has a third support plate 71 fixedly installed at the bottoms of two first connecting plates 6, a first rotating shaft 74 rotatably installed in the third support plate 71 through a bearing, and an external threaded rod 78 fixedly installed at the bottom end of the first rotating shaft 74 and capable of being screwed into the internal threaded hole of the slewing bearing. Select an external threaded rod 78 that matches the internal threaded hole in the inner ring or outer ring of the slewing bearing, and fixedly install the external threaded rod 78 at the bottom of the second connecting plate 75. When the first rotating shaft 74 rotates, it will drive the external threaded rod 78 to rotate, so that the external threaded rod 78 is screwed into the internal threaded hole of the inner ring or outer ring, realizing a threaded connection relationship.

[0029] Regarding the specific structure of the threaded screwing mechanism 7, please refer to Figure 3 and Figure 4 , including a third support plate 71. The center of the third support plate 71 is provided with a first shaft body installation hole 72 with open ends at both ends. Two fourth support plates 73 that are integrally formed with and symmetric to the third support plate 71 are provided on both sides of the third support plate 71. The third support plate 71 is internally installed with a rotatable first rotating shaft 74 through a bearing in the first shaft body installation hole 72. The top end of the first rotating shaft 74 is provided with a concave first shaft body fixing groove 76. The bottom end of the first rotating shaft 74 is fixedly installed with a second connecting plate 75. The bottom end of the second connecting plate 75 is fixedly installed with a third connecting plate 77. The bottom end of the third connecting plate 77 is provided with an external threaded rod 78 integrally formed with it. The rod body of the external threaded rod 78 is provided with an external thread structure, and this thread structure matches the internal threaded holes in the inner ring and outer ring of the slewing bearing.

[0030] To improve the stability of the thread structure during operation, please refer to Figure 1 , Figure 2 and Figure 5 , it is necessary to set up two elastic preloading mechanisms 8, which internally have a longitudinal hollow outer shell 81 fixedly installed at the bottom of the threaded screwing mechanism 7 and in a hollow state inside, a longitudinal telescopic rod 87 capable of axially moving along the longitudinal hollow outer shell 81 and the end of which can structurally abut against the upper surface of the slewing bearing body, and a first spiral spring 86 installed inside the longitudinal hollow outer shell 81 and exerting a downward elastic force on the longitudinal telescopic rod 87. When the external threaded rod 78 is screwed into the internal threaded hole of the inner ring or outer ring, the abutting head 88 will abut against the upper annular end face of the inner ring or outer ring. At this time, the longitudinal telescopic rod 87 will contract into the longitudinal component activity cavity 83, and the limiting plate 85 will cause the first spiral spring 86 to be compressed. The first spiral spring 86 provides an elastic force, and this force will act on the upper surface of the inner ring or outer ring. At the same time, it makes the internal thread structure and the external thread structure generate the same reaction force at the connection, achieving a preloading effect, thereby improving the stability of the thread structure during operation.

[0031] For the specific structure of the elastic preload mechanism 8, please refer to Figure 5 , including a longitudinal hollow shell 81, the top of the longitudinal hollow shell 81 is provided with a No. 4 connecting plate 82 which is an integral structure with it and fixedly installed at the bottom of the No. 4 supporting plate 73, the interior of the longitudinal hollow shell 81 is provided with a longitudinal component active cavity 83, the bottom end of the longitudinal hollow shell 81 is provided with a No. 1 shaft body through hole 84 which connects the space below it and the bottom end of the longitudinal component active cavity 83, the longitudinal hollow shell 81 is provided with a limit plate 85 which can move axially along the longitudinal component active cavity 83 inside the longitudinal component active cavity 83, the limit plate A No. 1 coil spring 86 is placed on the top of 85, and a longitudinal telescopic rod 87 passing through the No. 1 shaft through-hole 84 is fixedly installed on the bottom end of the limit plate 85, and a contact head 88 is fixedly installed on the bottom end of the longitudinal telescopic rod 87. The initial length of the No. 1 coil spring 86 is greater than the depth of the longitudinal component movable cavity 83, and one end of the No. 1 coil spring 86 contacts the top of the longitudinal component movable cavity 83, and the bottom end contacts the upper end surface of the limit plate 85. The horizontal height of the bottom end of the longitudinal hollow shell 81 is not lower than the horizontal height of the top end of the external threaded rod 78.

[0032] In order to prevent the external thread structure in the external thread rod 78 and the internal thread structure in the slewing bearing from being deformed due to excessive tightening torque, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7 , it is necessary to set a torque strength controllable linkage mechanism 9, which is provided with a hollow disk body 91 that can rotate under the action of a wrench, an inner rotating column 910 that can drive the No. 1 rotating shaft 74 to rotate, and an arc-shaped contact plate 99 that can make the hollow disk body 91 and the inner rotating column 910 linked by friction. When the hexagonal rotating head 92 is screwed with a wrench, the hexagonal rotating head 92 will drive the No. 2 rotating shaft 912 to rotate through the arc-shaped contact plate 99 and the inner rotating column 910, and then drive the No. 1 rotating shaft 74. When the screwing strength between the internal thread structure and the external thread structure is greater than the force formed by the maximum static friction between the internal rotating column 910 and the arc-shaped contact plate 99, the internal rotating column 910 and the arc-shaped contact plate 99 cannot continue to be linked, and relative rotation occurs between the hollow disk 91 and the arc-shaped contact plate 99, which does not cause the torque resistance to continue to increase, thereby preventing the external thread structure in the external thread rod 78 and the internal thread structure in the slewing bearing from being deformed due to excessive screwing torque strength.

[0033] For the specific structure of the torque intensity controllable linkage mechanism 9, please refer to Figure 6 and Figure 7, including a hollow disk body 91 and an inner rotating column 910, the upper end surface of the hollow disk body 91 is provided with a hexagonal rotating head 92 of an integral structure therewith, the center of the hollow disk body 91 is provided with a columnar component mounting cavity 93, the bottom end center of the hollow disk body 91 is provided with a No. 2 shaft mounting hole 94, the shaft body of the No. 2 rotating shaft 42 is mounted inside the No. 2 shaft mounting hole 94 through a bearing, the center of the columnar component mounting cavity 93 is provided with an inner rotating column 910, the bottom center of the inner rotating column 910 is provided with a No. 2 shaft fixing groove 911 for mounting the No. 2 rotating shaft 912, the bottom end of the No. 2 rotating shaft 912 is fixedly mounted inside the No. 1 rotating shaft 74, the hollow disk body 91 is provided with a plurality of annular array-type transverse component active cavities 95 on the periphery of the columnar component mounting cavity 93, the transverse component active cavities 95 and the columnar component mounting cavity 9 The circumferential side surfaces of 3 are connected through No. 1 and No. 2 shaft body through holes 96, and the hollow disk body 91 is provided with an inner movable plate 97 capable of axial movement along the cylindrical component mounting cavity 93 inside the cylindrical component mounting cavity 93, and a No. 2 coil spring 98 is placed at one end of the inner movable plate 97, and a connecting shaft body passing through the No. 1 and No. 2 shaft body through holes 96 is fixedly installed at the other end of the inner movable plate 97, and an arc-shaped contact plate 99 that abuts against the circumferential surface of the inner rotating column 910 is fixedly installed at one end of the connecting shaft body located inside the cylindrical component mounting cavity 93, one end of the No. 2 coil spring 98 abuts against one end surface of the inner movable plate 97, and the other end abuts against one end surface of the transverse component movable cavity 95, and the No. 2 coil spring 98 is in a compressed state, and the structural radius of the inner concave surface of the arc-shaped contact plate 99 matches the structural radius of the inner rotating column 910.

[0034] When in use, insert the hook of the lifting equipment into the hook socket 3, select the external threaded rod 78 that matches the internal threaded hole in the inner ring or outer ring of the slewing bearing, and fix the external threaded rod 78 on the bottom of the second connecting plate 75. Use a wrench to screw the hexagonal rotating head 92. The hexagonal rotating head 92 will drive the second rotating shaft 912 to rotate through the arc-shaped contact plate 99 and the inner rotating column 910, and then drive the first rotating shaft 74. When the first rotating shaft 74 rotates, it will drive the external threaded rod 78 to rotate, so that the external threaded rod 78 is screwed into the internal threaded hole of the inner ring or the outer ring. When the external threaded rod 78 is screwed into the internal threaded hole of the inner ring or the outer ring, the abutment head 88 will abut against the upper annular end surface of the inner ring or the outer ring. At this time, the longitudinal telescopic rod 87 will shrink into the movable cavity 83 of the longitudinal component, and the limit plate 85 will compress the No. 1 coil spring 86. The No. 1 coil spring 86 provides an elastic force, which will act on the upper surface of the inner ring or the outer ring. At the same time, the internal thread structure and the external thread structure will generate the same reaction force at the connection point, which has a pre-tightening effect, so that the lifting equipment can be started to drive the inner ring or outer ring of the slewing bearing to move.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slewing bearing lifting fixture, comprising a first support plate (1) with a lifting ring (2) mounted on its upper surface, a hook insertion hole (3) provided in the lifting ring (2), two second support plates (4) arranged on both symmetric sides of the first support plate (1), a longitudinal connecting rod (5) fixedly installed at the bottom of the second support plate (4), and a first connecting plate (6) fixedly installed at the bottom end of the longitudinal connecting rod (5), characterized in that: Further included is a threaded screwing mechanism (7), inside which there are a third support plate (71) fixedly installed at the bottom of two first connecting plates (6), a first rotating shaft (74) rotatably installed in the third support plate (71) through a bearing, and an external threaded rod (78) fixedly installed at the bottom end of the first rotating shaft (74) and capable of being screwed into the internal threaded hole of the slewing bearing; and two elastic preloading mechanisms (8), inside which there are a longitudinal hollow outer shell (81) fixedly installed at the bottom of the threaded screwing mechanism (7) and in a hollow state inside, a longitudinal telescopic rod (87) capable of moving axially along the longitudinal hollow outer shell (81) and with its end capable of structurally abutting against the upper surface of the slewing bearing body, and a first helical spring (86) installed inside the longitudinal hollow outer shell (81) and exerting a downward elastic force on the longitudinal telescopic rod (87).

2. The slewing bearing lifting fixture according to claim 1, wherein: The threaded screwing mechanism (7) includes a third support plate (71). A first shaft body installation hole (72) with both ends open is provided at the center of the third support plate (71). Two fourth support plates (73) which are integrally formed with and symmetric to the third support plate (71) are provided on both sides of the third support plate (71). A rotatable first rotating shaft (74) is installed in the first shaft body installation hole (72) of the third support plate (71) through a bearing. An inwardly concave first shaft body fixing groove (76) is provided at the top end of the first rotating shaft (74). A second connecting plate (75) is fixedly installed at the bottom end of the first rotating shaft (74). A third connecting plate (77) is fixedly installed at the bottom end of the second connecting plate (75). An external threaded rod (78) integrally formed with the third connecting plate (77) is provided at the bottom end of the third connecting plate (77).

3. The slewing bearing lifting fixture according to claim 2, wherein: An external thread structure is provided on the rod body of the external threaded rod (78), and this thread structure matches the internal threaded holes in the inner ring and outer ring of the slewing bearing.

4. The slewing bearing lifting fixture according to claim 3, wherein: The elastic preloading mechanism (8) includes a longitudinal hollow outer shell (81). A fourth connecting plate (82) integrally formed with and fixedly installed at the bottom end of the fourth support plate (73) is provided at the top end of the longitudinal hollow outer shell (81). A longitudinal component moving cavity (83) is provided inside the longitudinal hollow outer shell (81). A first shaft body through hole (84) communicating the space below it and the bottom end of the longitudinal component moving cavity (83) is provided at the bottom end of the longitudinal hollow outer shell (81). A limiting plate (85) capable of moving axially along the longitudinal component moving cavity (83) is placed inside the longitudinal hollow outer shell (81) at the position of the longitudinal component moving cavity (83). A first helical spring (86) is placed on the top of the limiting plate (85). A longitudinal telescopic rod (87) passing through the first shaft body through hole (84) is fixedly installed at the bottom end of the limiting plate (85). A contact head (88) is fixedly installed at the bottom end of the longitudinal telescopic rod (87).

5. The slewing bearing lifting fixture according to claim 4, characterized in that: The initial length of the first helical spring (86) is greater than the depth of the longitudinal component moving cavity (83), and one end of the first helical spring (86) abuts against the top end of the longitudinal component moving cavity (83), and the bottom end abuts against the upper end face of the limiting plate (85).

6. The slewing bearing lifting fixture according to claim 5, wherein: The horizontal height of the bottom end of the longitudinal hollow housing (81) is not lower than the horizontal height of the top end of the external threaded rod (78).

7. The slewing bearing lifting fixture according to claim 6, wherein: It further includes a torque strength controllable linkage mechanism (9), which internally is provided with a hollow disk body (91) that can rotate under the screwing action of a wrench, an inner rotating column (910) that can drive the first rotating shaft (74) to rotate, and an arc-shaped abutting plate (99) that can make the hollow disk body (91) and the inner rotating column (910) linked by relying on friction.

8. The slewing bearing lifting fixture according to claim 7, wherein: The torque strength controllable linkage mechanism (9) includes a hollow disk body (91) and an inner rotating column (910). The upper end face of the hollow disk body (91) is provided with a hexagonal rotating head (92) with an integral structure therewith. The center of the hollow disk body (91) is provided with a cylindrical component installation cavity (93). The center of the bottom end of the hollow disk body (91) is provided with a second shaft body installation hole (94). The shaft body of the second rotating shaft (42) is installed inside the second shaft body installation hole (94) through a bearing. The inner rotating column (910) is placed at the center of the cylindrical component installation cavity (93). The center of the bottom of the inner rotating column (910) is provided with a second shaft body fixing groove (911) for installing the second rotating shaft (912). The bottom end of the second rotating shaft (912) is fixedly installed inside the first rotating shaft (74). The hollow disk body (91) is provided with a plurality of laterally arranged component moving cavities (95) in an annular array around the cylindrical component installation cavity (93). The laterally arranged component moving cavities (95) and the circumferential side surface of the cylindrical component installation cavity (93) are communicated through a first and second shaft body through hole (96). The hollow disk body (91) places an inner moving plate (97) that can move axially along the cylindrical component installation cavity (93) inside the cylindrical component installation cavity (93). One end of the inner moving plate (97) places a second helical spring (98). The other end of the inner moving plate (97) is fixedly installed with a connecting shaft body that penetrates through the first and second shaft body through hole (96), and one end of the connecting shaft body located inside the cylindrical component installation cavity (93) is fixedly installed with an arc-shaped abutting plate (99) that abuts against the circumferential surface of the inner rotating column (910).

9. The slewing bearing lifting fixture according to claim 8, wherein: One end of the second helical spring (98) abuts against one end face of the inner moving plate (97), and the other end abuts against one end face of the laterally arranged component moving cavity (95), and the second helical spring (98) is in a compressed state.

10. A swing bearing lifting fixture according to claim 9, characterized in that: The structural radius of the concave surface of the arc-shaped abutting plate (99) matches the structural radius of the inner rotating column (910).

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