Lifting cantilever device for hollow axle ultrasonic flaw detector
By designing a lifting cantilever device in the hollow axle ultrasonic flaw detector and using a rotary locking handle to lock the rotating seat, the problems of shaking and collision of the detection device are solved, and a safe moving process is achieved.
Patent Information
- Application Number
- CN202422599400.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing hollow axle ultrasonic flaw detector is prone to shaking when the detection device is moved, increasing the risk of collision and making the movement process unsafe.
A lifting cantilever device is designed, which includes a lifting mechanism, a rotating mechanism, an extended swing mechanism and a connecting mechanism. A rotating locking hole is set on the fixed shaft, the rotating seat is connected to the rotating arm, and the rotating seat is locked to the fixed shaft using a rotating locking handle to limit the rotation of the rotating seat and prevent shaking.
It effectively prevents the detection device from shaking during movement, reduces the risk of collision, and improves the safety of the movement process.
Smart Images
Figure CN223426598U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ultrasonic flaw detection, in particular to a lifting cantilever device for a hollow axle ultrasonic flaw detector. Background Art
[0002] Ultrasonic flaw detectors for hollow axles emit ultrasonic waves to detect fatigue damage on EMU axles, enabling timely maintenance, preventing accidents, and ensuring the safe operation of EMUs. Existing ultrasonic flaw detectors for hollow axles typically incorporate a lifting mechanism to raise and lower the detection device, as well as a rotating mechanism to rotate it. However, the flexible rotation mechanism causes the detection device to wobble during movement, increasing the risk of collision and making the movement unsafe. Utility Model Content
[0003] The main technical problem solved by the utility model is to provide a lifting cantilever device for a hollow axle ultrasonic flaw detector, which solves the problem that the existing ultrasonic flaw detector will shake when driving the detection device to move, increasing the risk of collision and making the moving process unsafe.
[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a lifting cantilever device for a hollow axle ultrasonic flaw detector, comprising:
[0005] Lifting mechanism;
[0006] A rotating mechanism is connected to the lifting mechanism. The rotating mechanism includes a base, a fixed shaft, a rotating seat, a rotating locking handle and a rotating arm. The base is arranged at the top of the lifting mechanism. The lifting mechanism can drive the base to move vertically. The bottom of the fixed shaft is connected to the base. A plurality of rotating locking holes are provided in the circumferential direction of the fixed shaft. The rotating seat sleeve is provided on the periphery of the fixed shaft. The rotating seat can rotate relative to the fixed shaft. The rotating locking handle is connected to the rotating seat. One end of the rotating locking handle has a rotating locking pin. A first through hole is provided on the side wall of the rotating seat. The rotating locking pin can enter the rotating seat through the first through hole and be inserted into the rotating locking hole to limit the rotation of the rotating seat. The head end of the rotating arm is connected to the rotating seat.
[0007] The extended swing mechanism includes a swing connection base and an extension arm, wherein the swing connection base is hinged to the tail end of the rotating arm and is also connected to the extension arm;
[0008] The connecting mechanism is connected to the expansion arm, and the connecting mechanism is used to connect the detection device, and the detection device is used to emit ultrasonic waves to perform flaw detection on the hollow axle.
[0009] In some embodiments, the upper end of the fixed shaft is provided with a first bearing, the lower end of the fixed shaft is provided with a second bearing, and the top of the rotating seat is provided with a shaft end retaining ring and a bearing washer. The shaft end retaining ring is provided at the upper end of the fixed shaft, the shaft end retaining ring is fixedly connected to the fixed shaft, and the bearing washer is located between the first bearing and the shaft end retaining ring.
[0010] In some embodiments, a first hinge seat is provided at the tail end of the rotating arm, a hinge shaft is provided on the first hinge seat, and the swing connection seat is rotatably connected to the hinge shaft.
[0011] In some embodiments, a plurality of swing locking holes are provided at the bottom of the swing connection seat, and the plurality of swing locking holes are distributed along the circumferential direction of the swing connection seat. The extended swing mechanism also includes a swing locking handle, and one end of the swing locking handle has a swing locking pin. The swing locking handle is connected to the first hinge seat, and a second through hole is provided on the first hinge seat. The swing locking pin can enter the first hinge seat through the second through hole and be inserted into the swing locking hole to limit the swing of the swing connection seat.
[0012] In some embodiments, a limiting protrusion is provided on one side of the swing connection seat close to the extension arm, and the limiting protrusion is used to limit the swing of the swing connection seat.
[0013] In some embodiments, a second hinged seat is provided at one end of the extension arm close to the connecting mechanism, and the second hinged seat is hinged to the connecting mechanism.
[0014] In some embodiments, the connecting mechanism includes a sleeve, a spring, a sliding rod and a connecting piece. The upper end of the sleeve is connected to the expansion arm, the spring is located inside the sleeve, the sliding rod is partially arranged inside the sleeve, the sliding rod can slide vertically relative to the sleeve and squeeze the spring, the lower end of the sliding rod extends from the sleeve and is connected to the connecting piece, and the connecting piece is used to connect the detection device.
[0015] In some embodiments, the sliding rod includes a top cap portion and a rod body portion, the rod body portion is connected to the lower end of the top cap portion, the top cap portion is connected to the spring, and the rod body portion extends from the sleeve and is connected to the connecting piece.
[0016] In some embodiments, the top cap portion is a friction disc, a friction ring is sleeved on the friction disc, the friction ring fits against the inner surface of the sleeve, and the friction ring can slide along the inner surface of the sleeve.
[0017] In some embodiments, the lifting mechanism includes a mounting seat, a fixed column, a lifting column, a ball screw, a drive motor, a first pulley, a second pulley and a synchronous belt. The drive motor and the fixed column are arranged on the mounting seat, the lifting column is arranged in the fixed column and can slide vertically relative to the fixed column, the ball screw is threadedly installed inside the lifting column, the first pulley, the second pulley and the synchronous belt are arranged in the mounting seat, the drive motor is connected to the first pulley, the first pulley and the second pulley are connected through a synchronous belt, and the second pulley is connected to the ball screw.
[0018] The beneficial effects of the utility model are as follows: by arranging multiple rotation locking holes in the circumferential direction of the fixed shaft, the rotating seat sleeve is arranged on the periphery of the fixed shaft, the rotating seat is connected to the rotating arm, the rotating seat can rotate relative to the fixed shaft, further driving the rotating arm to rotate, and the rotating arm is connected to the detection device through the extended swing mechanism and the connecting mechanism, thereby driving the detection device to rotate, the rotation locking handle is connected to the rotating seat, and a first through hole is provided on the side wall of the rotating seat. When the rotating mechanism drives the detection device to rotate to a suitable position, the rotation locking pin at the front end of the rotation locking handle enters the rotating seat through the first through hole and is inserted into the rotation locking hole, thereby locking the rotating seat and the fixed shaft, limiting the rotation of the rotating seat, preventing shaking when the detection device is subsequently driven to move, reducing the risk of collision, and making the moving process safer. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;
[0020] Figure 2 This is a front view of a lifting mechanism according to an embodiment of the present utility model;
[0021] Figure 3 This is a structural diagram of a rotating mechanism according to an embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram of the exploded structure of the rotating mechanism of one embodiment of the utility model;
[0023] Figure 5 This is a structural diagram of an extended swing mechanism according to an embodiment of the present invention;
[0024] Figure 6 This is a structural diagram of an embodiment of the present invention when the swing connection seat and the first hinge seat are hinged;
[0025] Figure 7 It is a schematic diagram of the exploded structure of the connecting mechanism of one embodiment of the utility model. DETAILED DESCRIPTION
[0026] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.
[0027] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the technical field of this utility model. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.
[0028] Figure 1-Figure 7 The present invention shows an embodiment of a lifting cantilever device for a hollow axle ultrasonic flaw detector, comprising a lifting mechanism 1, a rotating mechanism 2, an extended swinging mechanism 3 and a connecting mechanism 4, wherein the lifting mechanism 1 is connected to the rotating mechanism 2, and the lifting mechanism 1 can drive the rotating mechanism 2 to move up and down in the vertical direction; the rotating mechanism 2 is connected to the extended swinging mechanism 3, and the extended swinging mechanism 3 can swing relative to the circumference of the rotating mechanism 2; the extended swinging mechanism 3 is connected to the connecting mechanism 4, and the connecting mechanism 4 is used to connect a detection device and can fine-tune the vertical height of the detection device; the detection device can emit ultrasonic waves to perform flaw detection on hollow axles.
[0029] Specifically, in Figure 3 and Figure 4 In the embodiment, the rotating mechanism 2 includes a base 21, a fixed shaft 22, a rotating seat 23, a rotating locking handle 24 and a rotating arm 25. The base 21 is arranged at the top end of the lifting mechanism 1, and the lifting mechanism 1 can drive the base 21 to move vertically. The bottom of the fixed shaft 22 is connected to the base 21. A plurality of rotating locking holes 221 are provided in the circumferential direction of the fixed shaft 22. The rotating seat 23 is sleeved on the periphery of the fixed shaft 22. The rotating seat 23 can rotate relative to the fixed shaft 22. The rotating locking handle 24 is connected to the rotating seat 23. The front end of the rotating locking handle 24 is provided with a rotating locking pin 241. A first through hole 231 is provided on the side wall of the rotating seat 23. The rotating locking pin 241 can enter the rotating seat 23 through the first through hole 231 and be inserted into the rotating locking hole 221 to limit the rotation of the rotating seat 23. The head end 251 of the rotating arm 25 is connected to the rotating seat 23.
[0030] Combine Figure 3 and Figure 5As shown, the extension swing mechanism 3 comprises a swing connecting seat 31 and an extension arm 32, the swing connecting seat 31 is hinged with the tail end 252 of the rotating arm 25, and the swing connecting seat 31 is also connected with the extension arm 32; the connecting mechanism 4 is connected with the extension arm 32, and the connecting mechanism 4 is used for connecting the detection device.
[0031] In the utility model, the base 21 is vertically moved by the lifting mechanism 1, the fixed shaft 22 is connected with the base 21, a plurality of rotating locking holes 221 are arranged in the circumferential direction of the fixed shaft 22, the rotating seat 23 is sleeved on the periphery of the fixed shaft 22, the rotating seat 23 is connected with the rotating arm 25, the rotating seat 23 can rotate relative to the fixed shaft 22, further drives the rotating arm 25 to rotate, the rotating arm 25 is connected with the detection device through the extension swing mechanism 3 and the connecting mechanism 4, so that the detection device is driven to rotate, the rotating locking handle 24 is connected with the rotating seat 23, the first through hole 231 is arranged on the side wall of the rotating seat 23, after the rotating mechanism 2 drives the detection device to rotate to the appropriate position, the rotating locking bolt 241 at the front end of the rotating locking handle 24 is made to enter the rotating seat 23 through the first through hole 231 and is inserted into the rotating locking hole 221, so that the rotating seat 23 is locked with the fixed shaft 22, the rotating seat 23 is limited to rotate, and the detection device is prevented from shaking when being driven to move subsequently, the risk of collision is reduced, and the moving process is safer.
[0032] The rotating locking handle 24 can insert the rotating locking bolt 241 into the rotating locking hole 221 by the pushing mode, or the rotating locking bolt 241 can also be made to extend by the rotating mode and is inserted into the rotating locking hole 221.
[0033] In some embodiments, in combination Figure 1 and Figure 2 As shown, the lifting mechanism 1 comprises a mounting seat 11, a fixed column 12, a lifting column 13, a ball screw 14, a driving motor 15, a first pulley 16, a second pulley 17 and a synchronous belt 18, the driving motor 15 and the fixed column 12 are arranged on the mounting seat 11, the lifting column 13 is arranged in the fixed column 12 and can vertically slide relative to the fixed column 12, the ball screw 14 is screw-mounted in the inside of the lifting column 13, the first pulley 16, the second pulley 17 and the synchronous belt 18 are arranged in the mounting seat 11, the driving motor 15 is connected with the first pulley 16, the first pulley 16 is connected with the second pulley 17 through the synchronous belt 18, and the second pulley 17 is connected with the ball screw 14. The first pulley 16 is driven to rotate by the driving motor 15, the first pulley 16 and the second pulley 17 are connected through the synchronous belt 18, the second pulley 17 also rotates synchronously, the second pulley 17 drives the ball screw 14 to rotate after rotating, the ball screw 14 drives the lifting column 13 to vertically slide relative to the fixed column 12 after rotating, the lifting column 13 is connected with the base 21, and the base 21 is driven to ascend or descend.
[0034] In some embodiments, as Figure 3 and Figure 4 As shown, in Figure 4 In the embodiment, the upper end of the fixed shaft 22 is sleeved with a first bearing 26, the lower end of the fixed shaft 22 is sleeved with a second bearing 30, and the top of the rotating seat 23 is provided with a shaft end retaining ring 27 and a bearing washer 28. The shaft end retaining ring 27 is provided at the upper end of the fixed shaft 22 and is fixedly connected to the fixed shaft 22. The bearing washer 28 is located between the first bearing 26 and the shaft end retaining ring 27. By providing the shaft end retaining ring 27 and the bearing washer 28, the shaft end retaining ring 27 is connected to the fixed shaft 22. The shaft end retaining ring 27 positions the end of the fixed shaft 22 through its own elastic deformation and friction with the end of the fixed shaft 22. The bearing washer 28 is located between the first bearing 26 and the shaft end retaining ring 27. The bearing washer 28 fills the gap between the first bearing 26 and the shaft end retaining ring 27, and plays a buffering and shock-absorbing role when the first bearing 26 is subjected to vibration and impact.
[0035] In some embodiments, as Figure 3 As shown, the tail end 252 of the rotating arm 25 is provided with a first articulated seat 29, and the first articulated seat 29 is a C-shaped opening structure. The first articulated seat 29 is provided with an articulated shaft 20, and the swing connection seat 31 is rotatably connected to the articulated shaft 20, thereby improving the reliability of the articulation between the first articulated seat 29 and the swing connection seat 31.
[0036] In some embodiments, combined Figure 3-Figure 6 As shown, in Figure 5 In the embodiment, a plurality of swing locking holes 311 are provided at the bottom of the swing connection seat 31. The plurality of swing locking holes 311 are distributed along the circumferential direction of the swing connection seat 31. Figure 3 In the embodiment, the extended swing mechanism 3 further includes a swing locking handle 33 having a swing locking pin 331 at its front end. The swing locking handle 33 is connected to the first hinge seat 29. The first hinge seat 29 is provided with a second through hole 291. The swing locking pin 331 can pass through the second through hole 291 into the first hinge seat 29 and be inserted into the swing locking hole 311 to limit the swing of the swing connection seat 31. When the swing connection seat 31 is swung to a suitable position, the swing locking handle 33 is operated, and the swing locking pin 331 passes through the second through hole 291 into the first hinge seat 29 and is inserted into the swing locking hole 311, thereby locking the swing connection seat 31 to the first hinge seat 29, preventing the swing connection seat 31 from shaking and providing greater safety.
[0037] In some embodiments, combined Figure 1 、 Figure 5 and Figure 6As shown, a limiting protrusion 312 is provided on one side of the swing connection base 31 near the extension arm 32. The limiting protrusion 312 is used to limit the swing of the swing connection base 31. During the swinging process of the extension arm 32, as the angle between the extension arm 32 and the rotating arm 25 continues to decrease, the limiting protrusion 312 eventually stops at the first hinge seat 29, thereby limiting the swing of the swing connection base 31 and preventing the extension arm 32 from colliding with the rotating arm 25.
[0038] In some embodiments, combined Figure 1 and Figure 5 As shown, a second hinge seat 34 is provided at one end of the extension arm 32 close to the connection mechanism 4, and the second hinge seat 34 is hinged to the connection mechanism 4. By hingedly connecting the second hinge seat 34 to the connection mechanism 4, the connection is more reliable and the movement process of the detection device is more stable.
[0039] In some embodiments, combined Figure 1 、 Figure 5 and Figure 7 As shown, in Figure 7 In the figure, the connecting mechanism 4 includes a sleeve 41, a spring 42, a sliding rod 43 and a connecting piece 44. The upper end of the sleeve 41 is connected to the extension arm 32, the spring 42 is located inside the sleeve 41, and the sliding rod 43 is partially arranged inside the sleeve 41. The sliding rod 43 can slide vertically relative to the sleeve 41 and squeeze the spring 42. The lower end of the sliding rod 43 extends from the sleeve 41 and is connected to the connecting piece 44. The connecting piece 44 is used to connect the detection device. By arranging the spring 42 inside the sleeve 41 and partially arranging the sliding rod 43 inside the sleeve 41, the sliding rod 43 can slide vertically relative to the sleeve 41 and squeeze the spring 42. The lower end of the sliding rod 43 extends from the sleeve 41 and is connected to the connecting piece 44. The connecting piece 44 is connected to the detection device. When the vertical height of the detection device needs to be adjusted, the vertical height of the detection device is first preliminarily adjusted by the lifting mechanism 1, and then the sliding rod 43 is synchronously adjusted in combination with the height of the hollow axle to be detected, thereby changing the stroke of the spring 42 and thus changing the vertical position of the sliding rod 43, thereby further realizing fine-tuning of the vertical height of the detection device.
[0040] In some embodiments, as Figure 7 As shown, the sliding rod 43 includes a top cap portion 431 and a rod body portion 432. The rod body portion 432 is connected to the lower end of the top cap portion 431, and the top cap portion 431 is connected to the upper end of the spring 42. The rod body portion 432 extends from the sleeve 41 and is connected to the connecting member 44. As the top cap portion 431 slides relative to the sleeve 41 and compresses the spring 42, the sliding is more stable and the contact effect with the spring 42 is better.
[0041] In some embodiments, as Figure 7As shown, the top cap part 431 is a friction disc, a friction slip ring 45 is sleeved on the friction disc, the friction slip ring 45 is attached to the inner surface of the sleeve 41, and the friction slip ring 45 can slide along the inner surface of the sleeve 41. By sleeving the friction slip ring 45 on the top cap part 431, when the rod body part 432 is pulled, the friction slip ring 45 slides along the inner surface of the sleeve 41, improving the stability of the sliding process.
[0042] Therefore, the utility model discloses a kind of lifting cantilever devices for hollow axle ultrasonic flaw detector, including lifting mechanism, rotating mechanism, extension swing mechanism and connecting mechanism, rotating mechanism includes base, fixed shaft, rotating seat, rotating locking handle and rotating arm, base is set at the top of lifting mechanism, fixed shaft is connected with base, and a plurality of rotating locking holes are set in the circumferential direction of fixed shaft, rotating seat is sleeved on the periphery of fixed shaft, rotating locking handle is connected with rotating seat, and rotating locking handle has rotating locking bolt at front end, first through-hole is formed in the side wall of rotating seat.When rotating mechanism drives detection device to rotate to appropriate position, rotating locking handle is operated, so that rotating locking bolt is inserted into rotating seat from first through-hole, and is inserted into rotating locking hole, so that rotating seat is locked with fixed shaft, the rotation of rotating seat is limited, shaking when subsequent detection device is moved is prevented, the risk of collision is reduced, and movement process is safer.
[0043] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation using the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.
Claims
1. A lifting cantilever device for a hollow axle ultrasonic flaw detector, characterized in that: include: Lifting mechanism; A rotating mechanism is connected to the lifting mechanism, the rotating mechanism comprising a base, a fixed shaft, a rotating seat, a rotating locking handle and a rotating arm, the base is arranged at the top end of the lifting mechanism, the lifting mechanism can drive the base to move vertically, the bottom of the fixed shaft is connected to the base, a plurality of rotating locking holes are provided in the circumferential direction of the fixed shaft, the rotating seat sleeve is provided on the periphery of the fixed shaft, the rotating seat can rotate relative to the fixed shaft, the rotating locking handle is connected to the rotating seat, one end of the rotating locking handle is provided with a rotating locking pin, a first through hole is provided on the side wall of the rotating seat, the rotating locking pin can enter the rotating seat through the first through hole and be inserted into the rotating locking hole to limit the rotation of the rotating seat, and the head end of the rotating arm is connected to the rotating seat; An extended swing mechanism, comprising a swing connection seat and an extension arm, wherein the swing connection seat is hinged to the tail end of the rotating arm, and the swing connection seat is also connected to the extension arm; A connecting mechanism is connected to the expansion arm, and the connecting mechanism is used to connect a detection device, and the detection device is used to emit ultrasonic waves to perform flaw detection on the hollow axle.
2. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 1, characterized in that: The upper end of the fixed shaft is sleeved with a first bearing, the lower end of the fixed shaft is sleeved with a second bearing, the top of the rotating seat is provided with a shaft end retaining ring and a bearing washer, the shaft end retaining ring is provided at the upper end of the fixed shaft, the shaft end retaining ring is fixedly connected to the fixed shaft, and the bearing washer is located between the first bearing and the shaft end retaining ring.
3. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 1, characterized in that: A first hinge seat is provided at the tail end of the rotating arm, a hinge shaft is provided on the first hinge seat, and the swing connection seat is rotatably connected to the hinge shaft.
4. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 3 is characterized in that: A plurality of swing locking holes are provided at the bottom of the swing connection seat, and the plurality of swing locking holes are distributed along the circumferential direction of the swing connection seat. The extended swing mechanism also includes a swing locking handle, and one end of the swing locking handle is provided with a swing locking pin. The swing locking handle is connected to the first hinge seat, and a second through hole is provided on the first hinge seat. The swing locking pin can enter the first hinge seat through the second through hole and be inserted into the swing locking hole to limit the swing of the swing connection seat.
5. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 3, characterized in that: A limiting protrusion is provided on one side of the swing connection seat close to the expansion arm, and the limiting protrusion is used to limit the swing of the swing connection seat.
6. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 1, characterized in that: A second hinged seat is provided at one end of the expansion arm close to the connecting mechanism, and the second hinged seat is hinged to the connecting mechanism.
7. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 1, characterized in that: The connecting mechanism includes a sleeve, a spring, a sliding rod and a connecting piece. The upper end of the sleeve is connected to the expansion arm, the spring is located inside the sleeve, and the sliding rod is partially arranged inside the sleeve. The sliding rod can slide vertically relative to the sleeve and squeeze the spring. The lower end of the sliding rod extends from the sleeve and is connected to the connecting piece. The connecting piece is used to connect the detection device.
8. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 7, characterized in that: The sliding rod includes a top cap portion and a rod body portion, wherein the rod body portion is connected to the lower end of the top cap portion, the top cap portion is connected to the spring, and the rod body portion extends from the sleeve and is connected to the connecting piece.
9. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 8, characterized in that: The top cap portion is a friction disc, a friction ring is sleeved on the friction disc, the friction ring fits the inner surface of the sleeve, and the friction ring can slide along the inner surface of the sleeve.
10. The lifting cantilever device for a hollow axle ultrasonic flaw detector according to claim 1, characterized in that: The lifting mechanism includes a mounting seat, a fixed column, a lifting column, a ball screw, a driving motor, a first pulley, a second pulley and a synchronous belt. The driving motor and the fixed column are arranged on the mounting seat, the lifting column is arranged in the fixed column and can slide vertically relative to the fixed column, the ball screw is threadedly installed in the interior of the lifting column, the first pulley, the second pulley and the synchronous belt are arranged in the mounting seat, the driving motor is connected to the first pulley, the first pulley and the second pulley are connected through the synchronous belt, and the second pulley is connected to the ball screw.