Driving device for synchronous lifting of lead screw

Abstract

The invention discloses a driving device for lead screw synchronous lifting, and relates to the field of lead screw driving. According to the supporting table, a connecting piece is arranged at the bottom of the supporting table, a locking bolt is connected to the supporting table in a threaded penetrating mode, and one end of the locking bolt is connected with the connecting piece in a threaded penetrating mode; the ball screw is located on the supporting table; a transmission mechanism used for enabling the ball screw to ascend and descend is arranged on the supporting table, a driving mechanism used for enabling the transmission mechanism to operate is arranged on the supporting table, and a tensioning mechanism is arranged at the top of the supporting table. According to the ball screw, by means of the arrangement mode that the driving mechanism is matched with the installation piece, the synchronous wheel, the tapered roller bearing and the fastening nut and the transmission mode that the installation piece, the synchronous wheel and the tapered roller bearing enable the ball screws to ascend and descend, the installation piece rotates and the ball screws do not rotate, synchronous ascending and descending operation of the multiple ball screws is facilitated, the structure is simple, and the practicability is high. Operation is convenient, transmission efficiency is improved, and the requirement for concentricity of the lead screw does not need to be considered.

Description

Technical Field

[0001] The invention relates to the field of screw rod driving, in particular to a driving device for synchronous lifting of a screw rod. Background Art

[0002] Screw rods are usually a commonly used driving component. Screw rods are widely used and there are many types of screw rods, including ball screws. When multiple ball screws are used in combination, they usually form a screw drive module, which is also called a linear drive. The screw drive module is mainly used for linear movement of parts. The screw drive module is usually equipped with a drive device, which can make multiple screws rise and fall synchronously.

[0003] The screw lifting drive device in the prior art usually includes a driving member, a ball screw, a fixed seat, two synchronous wheels and a synchronous belt. The fixed seat supports both the driving member and the ball screw, and the two synchronous wheels and the synchronous belt enable the driving member to drive the ball screw to perform lifting operations.

[0004] If multiple ball screws are required for lifting operations, it is usually necessary to set up multiple driving parts and fixed seats, and then use them in an arranged manner. However, this method will have a complex structure, resulting in a large space occupation area, and there will be poor synchronization and low transmission efficiency. Therefore, it is necessary to use a streamlined drive device to achieve multi-screw synchronous transmission. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a driving device for synchronously lifting and lowering screw rods, which solves the problem that multiple ball screws are provided with multiple driving devices for lifting operations, the driving device has a complex structure, occupies a large space and has poor synchronization.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A driving device for synchronous lifting of a screw rod, comprising:

[0007] A support platform, wherein a connecting piece is provided at the bottom of the support platform, a locking bolt is threadedly inserted and connected to the top of the support platform, and one end of the locking bolt is threadedly inserted and connected to the connecting piece;

[0008] A ball screw, wherein the ball screw is located on a support platform;

[0009] The support platform is provided with a transmission mechanism for lifting and lowering the ball screw, the support platform is provided with a driving mechanism for operating the transmission mechanism, and the top of the support platform is provided with a tensioning mechanism.

[0010] Preferably, the transmission mechanism comprises:

[0011] A mounting part, wherein the ball screw is located inside the mounting part;

[0012] A synchronous wheel, wherein the synchronous wheel is sleeved on the outside of the mounting member;

[0013] A tapered roller bearing, wherein the tapered roller bearing is sleeved on the outside of the mounting member;

[0014] A fixing nut is located at the bottom of the mounting member, and the fixing nut is located at the bottom of the tapered roller bearing.

[0015] Preferably, an assembly ring is embedded in the interior of the synchronous wheel, the mounting piece is slidably inserted and connected with the inner cavity of the assembly ring, a fixing hole is provided at the top of the assembly ring, an assembly seat is fixedly connected to the bottom of the support platform, the tapered roller bearing is located inside the assembly seat, a through groove matching the mounting piece is provided at the top of the support platform, a mounting hole is provided on the outer wall of the locking nut, and an anti-drop bolt is threadedly inserted and connected to the inner cavity of the mounting hole.

[0016] Preferably, the mounting member comprises:

[0017] A mounting flange, the mounting flange is located at the top of the assembly ring, and the mounting flange is located inside the synchronous wheel, a fastening bolt is threadedly inserted and connected to the top of the mounting flange, and one end of the fastening bolt is threadedly inserted and connected to the inner cavity of the fixing hole;

[0018] The guide rod is located inside the tapered roller bearing, the guide rod is provided with an external thread on the outside, the inner wall of the locking nut is provided with an internal thread matching the external thread, and the guide rod is provided with a screw hole matching the end of the anti-dropping bolt on the outside.

[0019] Preferably, the driving mechanism comprises:

[0020] A driving motor, wherein the driving motor is located at the bottom of the supporting platform;

[0021] A driving wheel, the driving wheel is rotatably disposed on the top of the support platform;

[0022] The guide wheel is rotatably arranged on the top of the support platform, and the guide wheel, the driving wheel and the synchronous wheel are provided with a synchronous belt for making them rotate synchronously.

[0023] Preferably, the driving motor comprises:

[0024] A mounting foot, wherein the mounting foot is fixedly connected to the drive motor, a connecting bolt is threadedly inserted and connected to the bottom of the mounting foot, and one end of the connecting bolt is threadedly inserted and connected to the support platform;

[0025] The output end of the driving motor is connected to the driving shaft in a transmission manner, and a through hole matching the driving shaft is formed on the top of the supporting platform.

[0026] Preferably, the drive motor further comprises a fixing key, wherein the fixing key is fixedly connected to the outside of the drive shaft, and the inner wall of the drive wheel is provided with a keyway matching with the fixing key, and the drive wheel is clamped to the outside of the drive shaft via the fixing key.

[0027] Preferably, the tensioning mechanism comprises:

[0028] A tension wheel, the outer wall of which is in contact with the synchronous belt, and the tension wheel is located on the top of the support platform;

[0029] The sliding seat is slidably arranged on the top of the supporting platform.

[0030] Preferably, the tensioning mechanism further comprises:

[0031] A fixed seat, the fixed seat is fixedly connected to the top of the support platform, an adjusting column is inserted and connected through the inner cavity thread of the fixed seat, and one end of the adjusting column is rotatably connected to the sliding seat;

[0032] A fixed shaft is fixedly connected to the bottom end of the inner wall of the sliding seat, the tensioning wheel is rotatably inserted and connected to the outside of the fixed shaft, and a limiting plate is installed on the top of the fixed shaft.

[0033] Preferably, a sliding groove is provided on the top of the support platform, and the sliding seat is slidably inserted and connected with the inner cavity of the sliding groove. An assembly groove is provided on the top of the sliding seat, and the inner cavity of the assembly groove is slidably inserted and connected with a mounting column. The bottom end of the inner wall of the sliding groove is provided with a groove matching the mounting column, and the outer wall of the mounting column is threadedly inserted and connected with a locking nut, and the locking nut is located at the bottom of the support platform.

[0034] The present invention discloses a driving device for synchronous lifting of a screw rod, which has the following beneficial effects:

[0035] 1. The ball screw uses a setting mode in which a driving mechanism and a mounting part, a synchronous wheel, a tapered roller bearing and a fixing nut are matched. The mounting part, the synchronous wheel and the tapered roller bearing enable the ball screw to be lifted and lowered, the mounting part rotates, and the ball screw does not rotate. At the same time, the driving wheel and the synchronous belt on the driving mechanism are used to rotate multiple synchronous wheels at the same time. The support platform supports multiple ball screws, which is conducive to the synchronous lifting and lowering operation of multiple ball screws. The structure is simple, easy to operate, easy to save occupied area, and ensure the synchronization of the rotation of multiple ball screws, improve the transmission efficiency, and there is no need to consider the concentricity requirements of the screws;

[0036] 2. The tensioning wheel, sliding seat, adjusting column, mounting column, locking nut, fixed seat and fixed shaft are arranged in a coordinated manner. The tensioning wheel rotates outside the fixed shaft, the sliding seat supports the tensioning wheel, and the adjusting column pushes the sliding seat to move, so that the tensioning wheel squeezes the synchronous belt, which is beneficial to adjust the tension of the synchronous belt and makes it easy for multiple synchronous wheels and drive wheels to rotate synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 It is a structural schematic diagram of the ball screw of the present invention;

[0040] Figure 3 For the present invention Figure 2 Enlarged view of the rotating cover.

[0041] Figure 4 It is a structural schematic diagram of the tapered roller bearing of the present invention.

[0042] Figure 5 It is a structural schematic diagram of the synchronous wheel of the present invention.

[0043] Figure 6 It is a structural schematic diagram of the fixing nut of the present invention.

[0044] Figure 7 It is a schematic diagram of the structure of the drive shaft of the present invention.

[0045] Figure 8 It is a schematic diagram of the structure of the fixed shaft of the present invention.

[0046] In the figure: 1. support platform; 2. connecting part; 3. driving mechanism; 31. driving motor; 311. mounting foot; 312. connecting bolt; 313. driving shaft; 314. fixing key; 32. driving wheel; 33. synchronous belt; 34. guide wheel; 4. transmission mechanism; 41. mounting part; 411. mounting flange; 412. guide rod; 413. external thread; 42. synchronous wheel; 421. assembly ring; 43. tapered roller bearing; 44. fixing nut; 441. internal thread; 442. mounting hole; 45. fixing bolt; 46. anti-slip bolt; 5. tensioning mechanism; 51. tensioning wheel; 52. sliding seat; 53. adjusting column; 54. mounting column; 55. locking nut; 56. fixing seat; 57. fixing shaft; 6. ball screw; 7. locking bolt. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The embodiment of the present application solves the problem that the drive device used for multiple ball screws occupies a large space area and has poor synchronization by providing a drive device for synchronous lifting of the screw rods. The drive motor 31 drives the drive shaft 313 to rotate, thereby rotating the drive wheel 32, and the drive wheel drives the synchronous belt 33 to transmit, thereby rotating multiple synchronous wheels 42. The synchronous wheel 42 drives the mounting part 41 to rotate on the tapered roller bearing 43, and then the ball screw 6 is extended in a certain direction for lifting operation, so that the ball screw 6 drives the transmission tooling to move.

[0049] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] The embodiment of the invention discloses a driving device for synchronous lifting of a screw rod.

[0051] According to the attached Figure 1 As shown in Figure 8, it includes a support platform 1, which is conducive to supporting multiple ball screws 6. A connecting piece 2 and a ball screw 6 are provided at the bottom of the support platform 1. A locking bolt 7 is threadedly inserted and connected to the top of the support platform 1, which is conducive to the installation and disassembly of the connecting piece 2. One end of the locking bolt 7 is threadedly inserted and connected to the connecting piece 2. The ball screw 6 is located on the support platform 1.

[0052] Furthermore, a transmission mechanism 4 for lifting and lowering the ball screw 6 is provided on the support platform 1, and a driving mechanism 3 for operating the transmission mechanism 4 is provided on the support platform 1, which is conducive to the operation of the transmission mechanism 4 and then the ball screw 6 is extended in a certain direction. A tensioning mechanism 5 is provided on the top of the support platform 1.

[0053] It should be noted that the transmission mechanism 4 includes a mounting member 41, a synchronous wheel 42, a tapered roller bearing 43 and a fixing nut 44. The mounting member 41 is non-standard in configuration. The mounting member 41 is conducive to lifting and lowering the ball screw 6 inside the mounting member 41. The ball screw 6 is lifted and lowered by rotating the mounting member 41 without considering the concentricity requirement of the ball screw 6. It is also conducive to installing the synchronous wheel 42 and the tapered roller bearing 43. The synchronous wheel 42 is conducive to rotating the mounting member 41, thereby facilitating the lifting and lowering of the ball screw 6. The tapered roller bearing 43 is conducive to reducing the friction of the mounting member 41, facilitating the smooth rotation of the ball screw 6. The fixing nut 44 is conducive to contact with the bottom of the mounting member 41. The ball screw 6 is threadedly inserted and connected to the inside of the mounting piece 41. The mounting piece 41 includes a mounting flange 411 and a guide rod 412. The mounting flange 411 is conducive to being connected with the assembly ring 421 on the synchronous wheel 42, which is convenient for installing and fixing the mounting piece 41. The guide rod 412 is conducive to installing the tapered roller bearing 43 and is also conducive to matching with the fixing nut 44. The mounting flange 411 is located at the top of the assembly ring 421, and the mounting flange 411 is located inside the synchronous wheel 42. The top of the mounting flange 411 is threadedly inserted and connected with a fixing bolt 45, which is conducive to installing and removing the mounting piece 41 and the synchronous wheel 42. One end of the fixing bolt 45 is inserted and connected with the inner cavity thread of the fixing hole, the guide rod 412 is located inside the tapered roller bearing 43, and the outside of the guide rod 412 is provided with an external thread 413, which is conducive to the threaded connection of the fixing nut 44 and the guide rod 412, and the inner wall of the fixing nut 44 is provided with an internal thread 441 that matches the external thread 413, and the outside of the guide rod 412 is provided with a screw hole that matches the end of the anti-dropping bolt 46, the synchronous wheel 42 is sleeved on the outside of the mounting member 41, the tapered roller bearing 43 is sleeved on the outside of the mounting member 41, the fixing nut 44 is located at the bottom of the mounting member 41, and the fixing nut 44 is located at the bottom of the tapered roller bearing 43, and the inside of the synchronous wheel 42 is embedded with an assembly ring 421, which is conducive to The mounting flange 411 is installed and supported, which is also conducive to limiting the rotation position of the synchronous wheel 42. The mounting piece 41 is slidably and interlacedly connected with the inner cavity of the assembly ring 421. A fixing hole is provided on the top of the assembly ring 421, and an assembly seat is fixedly connected to the bottom of the support platform 1, which is conducive to installing and supporting the tapered roller bearing 43. The tapered roller bearing 43 is located inside the assembly seat. A through groove matching the mounting piece 41 is provided on the top of the support platform 1. A mounting hole 442 is provided on the outer wall of the locking nut 44. The inner cavity of the mounting hole 442 is threadedly interlaced with an anti-slip bolt 46, which is conducive to limiting the relative position of the locking nut 44 and the guide rod 412, and avoiding the locking nut 44 from loosening due to self-rotation.

[0054] More specifically, the driving mechanism 3 includes a driving motor 31, a driving wheel 32 and a guide wheel 34. The driving motor 31 is electrically connected to the motor switch through an external power supply. The driving motor 31 is conducive to driving the driving shaft 313 to rotate, and then to driving the driving wheel 32 to rotate. The driving wheel 32 is conducive to driving the synchronous belt 33 for transmission. The guide wheel 34 is conducive to guiding the synchronous belt 33. The driving motor 31 is located at the bottom of the support platform 1. The driving motor 31 includes a mounting foot 311, a driving shaft 313 and a fixing key 314. The mounting foot 311 and the connecting bolt 312 are conducive to installing and disassembling the driving motor 31. The mounting foot 311 is fixedly connected to the driving motor 31. The bottom of the mounting foot 311 is threadedly interspersed with a connecting bolt 312. One end of the connecting bolt 312 is threadedly interspersed with the support platform 1. The output end of the driving motor 31 is connected to the driving shaft 313 for transmission. A through hole matching the driving shaft 313 is provided on the top of the support platform 1. The fixed key 314 is fixedly connected to the outside of the driving shaft 313. The inner wall of the driving wheel 32 is provided with a keyway matching the fixed key 314, which is conducive to the assembly operation of the driving wheel 32. The driving wheel 32 is clamped to the outside of the driving shaft 313 through the fixed key 314. The driving wheel 32 is rotatably set on the top of the support platform 1. The guide wheel 34 is rotatably set on the top of the support platform 1. The guide wheel 34, the driving wheel 32 and the synchronous wheel 42 are provided with a synchronous belt 33 for making them rotate synchronously. During the transmission process of the synchronous belt 33, multiple synchronous wheels 42 and guide wheels 34 are rotated synchronously, which is conducive to the synchronous lifting of multiple ball screws 6 and improves the synchronization. The synchronous belt 33 is made of polyurethane with steel wire.

[0055] In particular, the tensioning mechanism 5 includes a tensioning wheel 51, a sliding seat 52, a fixed seat 56 and a fixed shaft 57. The tensioning wheel 51 is conducive to adjusting the tensioning force of the synchronous belt 33 so as to maintain the synchronization of multiple ball screws 6. The sliding seat 52 is conducive to supporting the tensioning wheel 51 and driving the tensioning wheel 51 to move. The fixed seat 56 enables the adjusting column 53 to rotate thereon, which is convenient for supporting the adjusting column 53. The outer wall of the tensioning wheel 51 fits with the synchronous belt 33. The tensioning wheel 51 is located at the top of the support platform 1, and the sliding seat 52 is slidably arranged on the top of the support platform 1. The fixed seat 56 is fixedly connected to the top of the support platform 1. The inner cavity of the fixed seat 56 is threadedly connected with the adjusting column 53, which is conducive to pushing the sliding seat 52 to move, so as to facilitate the tensioning wheel 51 to adjust the degree of extrusion of the synchronous belt 33 for tensioning. Adjustment, one end of the adjusting column 53 is rotatably connected to the sliding seat 52, the fixed shaft 57 is fixedly connected to the bottom end of the inner wall of the sliding seat 52, the tensioning wheel 51 is rotatably inserted and connected to the outside of the fixed shaft 57, and a limiting plate is installed on the top of the fixed shaft 57. A sliding groove is provided on the top of the support platform 1, and the sliding seat 52 is slidably inserted and connected with the inner cavity of the sliding groove. An assembly groove is provided on the top of the sliding seat 52, and the inner cavity of the assembly groove is slidably inserted and connected with a mounting column 54, which is conducive to connecting the sliding seat 52 with the support platform 1 and facilitating the installation and disassembly of the sliding seat 52. A groove matching the mounting column 54 is provided at the bottom end of the inner wall of the sliding groove, and a locking nut 55 is threadedly inserted and connected to the outer wall of the mounting column 54, which is conducive to the installation and disassembly of the mounting column 54, and then it is conducive to the installation and disassembly of the tensioning wheel 51. The locking nut 55 is located at the bottom of the support platform 1.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A driving device for synchronous lifting of a screw rod, comprising: A support platform (1), wherein a connecting piece (2) is provided at the bottom of the support platform (1), a locking bolt (7) is threadedly inserted and connected at the top of the support platform (1), and one end of the locking bolt (7) is threadedly inserted and connected to the connecting piece (2); A ball screw (6), wherein the ball screw (6) is located on the support platform (1); The invention is characterized in that a transmission mechanism (4) for lifting and lowering the ball screw (6) is arranged on the support platform (1), a driving mechanism (3) for operating the transmission mechanism (4) is arranged on the support platform (1), and a tensioning mechanism (5) is arranged on the top of the support platform (1).

2. A driving device for synchronous lifting of a screw rod according to claim 1, characterized in that: The transmission mechanism (4) comprises: A mounting member (41), wherein the ball screw (6) is located inside the mounting member (41); A synchronous wheel (42), wherein the synchronous wheel (42) is sleeved on the outside of the mounting member (41); A tapered roller bearing (43), wherein the tapered roller bearing (43) is sleeved on the outside of the mounting member (41); A fixing nut (44), wherein the fixing nut (44) is located at the bottom of the mounting member (41), and the fixing nut (44) is located at the bottom of the tapered roller bearing (43).

3. A driving device for synchronous lifting of a screw rod according to claim 2, characterized in that: An assembly ring (421) is embedded in the interior of the synchronous wheel (42), the mounting piece (41) is slidably connected to the inner cavity of the assembly ring (421), a fixing hole is provided at the top of the assembly ring (421), an assembly seat is fixedly connected to the bottom of the support platform (1), the tapered roller bearing (43) is located inside the assembly seat, a through groove matching the mounting piece (41) is provided at the top of the support platform (1), a mounting hole (442) is provided on the outer wall of the fixing nut (44), and an anti-drop bolt (46) is threadedly inserted into the inner cavity of the mounting hole (442).

4. A driving device for synchronous lifting of a screw rod according to claim 3, characterized in that: The mounting member (41) comprises: A mounting flange (411), the mounting flange (411) being located at the top of the assembly ring (421), and the mounting flange (411) being located inside the synchronous wheel (42), a fastening bolt (45) being threadedly inserted and connected at the top of the mounting flange (411), and one end of the fastening bolt (45) being threadedly inserted and connected to the inner cavity of the fixing hole; A guide rod (412), the guide rod (412) is located inside the tapered roller bearing (43), the guide rod (412) is provided with an external thread (413) on the outside, the inner wall of the fixing nut (44) is provided with an internal thread (441) matching with the external thread (413), and the guide rod (412) is provided with a screw hole matching with the end of the anti-detachment bolt (46) on the outside.

5. The driving device for synchronous lifting of a screw rod according to claim 1, characterized in that: The driving mechanism (3) comprises: A driving motor (31), wherein the driving motor (31) is located at the bottom of the supporting platform (1); A driving wheel (32), the driving wheel (32) being rotatably disposed on the top of the support platform (1); A guide wheel (34) is rotatably arranged on the top of the support platform (1); a synchronous belt (33) is provided on the guide wheel (34), the driving wheel (32) and the synchronous wheel (42) for making them rotate synchronously.

6. A driving device for synchronous lifting of a screw rod according to claim 5, characterized in that: The driving motor (31) comprises: A mounting foot (311), the mounting foot (311) being fixedly connected to the driving motor (31), a connecting bolt (312) being threadedly inserted and connected at the bottom of the mounting foot (311), and one end of the connecting bolt (312) being threadedly inserted and connected to the supporting platform (1); A driving shaft (313), the output end of the driving motor (31) is drivingly connected to the driving shaft (313), and a through hole matching the driving shaft (313) is provided on the top of the supporting platform (1).

7. A driving device for synchronous lifting of a screw rod according to claim 6, characterized in that: The driving motor (31) further comprises a fixing key (314), wherein the fixing key (314) is fixedly connected to the outside of the driving shaft (313), and the inner wall of the driving wheel (32) is provided with a keyway matching with the fixing key (314), and the driving wheel (32) is clamped to the outside of the driving shaft (313) via the fixing key (314).

8. The driving device for synchronous lifting of a screw rod according to claim 1, characterized in that: The tensioning mechanism (5) comprises: A tension wheel (51), the outer wall of which is in contact with the synchronous belt (33), and the tension wheel (51) is located on the top of the support platform (1); A sliding seat (52), wherein the sliding seat (52) is slidably arranged on the top of the support platform (1).

9. A driving device for synchronous lifting of a screw rod according to claim 8, characterized in that: The tensioning mechanism (5) further comprises: A fixed seat (56), the fixed seat (56) is fixedly connected to the top of the support platform (1), an adjusting column (53) is inserted and connected through the inner cavity thread of the fixed seat (56), and one end of the adjusting column (53) is rotatably connected to the sliding seat (52); A fixed shaft (57) is fixedly connected to the bottom end of the inner wall of the sliding seat (52); the tensioning wheel (51) is rotatably inserted and connected to the outside of the fixed shaft (57); and a limiting plate is installed on the top of the fixed shaft (57).

10. A driving device for synchronous lifting of a screw rod according to claim 9, characterized in that: The top of the support platform (1) is provided with a sliding groove, the sliding seat (52) is slidably inserted and connected with the inner cavity of the sliding groove, the top of the sliding seat (52) is provided with an assembly groove, the inner cavity of the assembly groove is slidably inserted and connected with a mounting column (54), the bottom end of the inner wall of the sliding groove is provided with a groove matching the mounting column (54), the outer wall of the mounting column (54) is threadedly inserted and connected with a locking nut (55), and the locking nut (55) is located at the bottom of the support platform (1).

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