CN221037328U - Millimeter wave radar deformation measuring device capable of being adjusted at multiple angles - Google Patents

Abstract

The utility model relates to the field of deformation measuring devices, in particular to a millimeter wave radar deformation measuring device capable of being adjusted at multiple angles. Technical problems: the existing measuring device is used for measuring deformation conditions of building construction or geology generally, because the device is used in an environment where dust is more and sundries are easy to fall, the shell and key parts of the device can be directly damaged by hard sundries falling, so that equipment is invalid and damaged, and when the measuring device is used for measuring multi-angle measuring objects, a great amount of time is consumed by manual adjustment, and the problem of measuring efficiency of object deformation is reduced. The technical scheme is as follows: the millimeter wave radar deformation measuring device capable of being adjusted at multiple angles comprises a supporting platform, an auxiliary supporting component, a lifting component, an angle adjusting component, a limiting plate, a protection dustproof component and a damping component; utilize driving motor drive rotary rod rotatory, the rotary rod drives the fixed block and connects and detect the radar and follow the inside rotatory angle regulation of swivelling chute.

Description

Millimeter wave radar deformation measuring device capable of being adjusted at multiple angles

Technical Field

The utility model relates to the field of deformation measuring devices, in particular to a millimeter wave radar deformation measuring device capable of being adjusted at multiple angles.

Background

The millimeter wave radar deformation measuring device is equipment based on millimeter wave radar technology and is used for measuring deformation and deformation of a target object, the working frequency of the millimeter wave radar system is located in millimeter wave band, the millimeter wave radar has higher frequency and shorter wavelength, the millimeter wave radar measures deformation, the millimeter wave radar technology is used for measuring the deformation and deformation of the target object, when the millimeter wave radar is used for deformation, the millimeter wave radar deformation measuring device capable of being adjusted at multiple angles is needed, the existing measuring device is used for measuring deformation conditions of building construction or geology generally, because the device is used in an environment where sundries fall easily occurs due to more dust, the shell and key parts of the device can be damaged directly due to the fact that the hard sundries fall, so that the equipment is invalid and damaged, and when the measuring device is used for measuring the multi-angle measuring object, a large amount of time is consumed by manual adjustment, and the measuring efficiency of deformation of the object is reduced; therefore, we propose a millimeter wave radar deformation measuring device capable of being adjusted at multiple angles so as to solve the problems set forth in the above.

Disclosure of utility model

In order to overcome the existing measuring device, because the device is used in an environment that dust is more and easy to fall, the shell and key parts of the device can be directly damaged by the falling of hard sundries, so that equipment is invalid and damaged, and the measuring device needs to be manually adjusted when measuring a multi-angle measuring object, so that a large amount of time is consumed, and the problem of measuring efficiency of deformation of the object is reduced.

The technical scheme of the utility model is as follows: a millimeter wave radar deformation measuring device capable of being adjusted at multiple angles comprises a supporting platform, an auxiliary supporting component, a lifting component, an angle adjusting component, a limiting plate, a protection dustproof component and a damping component; the limiting plate for supporting the radar is arranged above the supporting platform, the lifting component for adjusting the height of the limiting plate is arranged at the center of the lower end of the limiting plate, the auxiliary supporting component for lifting and adjusting the auxiliary lifting component is arranged between the supporting platform and the limiting plate, the angle adjusting component for fixing and driving the radar to adjust the angle for detection is arranged at the center of the upper end of the limiting plate, the protection dustproof component for protecting the radar from external impact and dust intrusion is arranged at the outer side of the angle adjusting component, and the damping component for slowing down the shaking of the device is arranged at the lower end of the supporting platform.

Preferably, the telescopic rod is connected with the auxiliary limiting plate through the bushing to push the radar to stably lift and adjust, extra support is provided when the limiting plate is adjusted, the radar is kept stable in adjustment at different heights, the stability of the device is improved, the telescopic push rod is pushed by the air cylinder to push the radar to lift and adjust automatically, the workload of manual operation is reduced, the operation efficiency is improved, the accuracy of measurement is improved, the rotary groove is used for fixing the semicircular slide block to connect the fixed block to limit the detection radar, the movement range and the angle of the radar are accurately controlled, thereby realizing more accurate and controllable multi-angle measurement, utilizing a driving motor to drive a rotating rod to rotate, the rotating rod drives a fixed block to be connected with a detection radar to rotate along the inside of a rotating groove to adjust the detection angle, realizing accurate rotation control of the radar, thereby ensuring high-precision angle adjustment and measurement of the target, enabling the detection radar to flexibly adjust according to the detection angle, can meet the measurement requirements under different angles, provides wider application range, covers the radar by adopting a telescopic cover plate to realize telescopic adjustment along the outer end of a fixed column, the radar is completely covered and protected when the device is not in use, so as to avoid the adverse effect of dust, sundries or bad weather on the radar, meanwhile, the device is prevented from being used in an environment that dust is more and sundries are prone to falling, the shell and other key parts of the device can be directly damaged when the hard sundries fall, the use safety of the device is improved, the auxiliary spring is sleeved on the telescopic column to provide shock absorption for the device, the shock and impact of the device are reduced, the impact caused by the external shock is absorbed, the key parts of equipment are protected, the damage and abrasion are reduced, and the stability of the equipment in the working process is maintained.

As the preference, auxiliary stay subassembly is equipped with the multiunit, multiunit auxiliary stay subassembly is around setting along supporting platform's upper end, auxiliary stay subassembly is including stopper, dead lever, bush and telescopic link, the dead lever is located the inside of stopper, the outer wall cover of dead lever is equipped with the bush, the one end of bush is equipped with the telescopic link, the one end and the limiting plate fixed connection of bush are kept away from to the telescopic link, through adopting the supplementary limiting plate of bush-connected telescopic link to promote radar stable lift adjustment, provide extra support when limiting plate adjusts, keep the radar at the stability of not co-altitude mixture control, improve device's stability.

As the preference, lifting assembly is including cylinder and flexible push rod, and the cylinder is located supporting platform's lower extreme, is equipped with flexible push rod between cylinder and the supporting platform, and flexible push rod passes supporting platform and extends to the upper end and be connected with the limiting plate, promotes the radar through adopting the cylinder to promote flexible push rod and goes up and down, realizes automatic lift adjustment, has reduced manual operation's work load, has improved the efficiency of operation, helps improving the accuracy of measurement.

As the preference, angle adjusting part is including fixed block, rotating electrical machines, rotary rod, detection radar, slide bar and semicircle slider, the rotary tank that holds angle adjusting part has been seted up to the upper end of limiting plate, and the fixed block is located the top in rotary tank, and the outer end of fixed block is equipped with detects the radar, and the lower extreme of fixed block is equipped with the semicircle slider, and it detects the radar to connect the fixed block spacing through adopting the fixed semicircle slider of rotary tank, accurate control radar's range of motion and angle to realize more accurate and controllable multi-angle measurement.

As the preference, the inside of semicircle slider is equipped with the slide bar, and the slide bar passes the semicircle slider and extends to the swivelling chute inner wall, and the sliding tray that holds the slide bar and slide is offered to the inner wall of swivelling chute, and the top of fixed block is equipped with driving motor, driving motor with be equipped with the rotary rod between the fixed block, the rotary rod passes the fixed block and extends to the inside of limiting plate, and rotatory through adopting driving motor drive rotary rod, the rotary rod drives the fixed block to connect and detects the radar and along the inside rotatory regulation detection angle of swivelling chute, realizes the accurate rotary control to the radar to ensure to carry out high accuracy's angle regulation and measurement to the target, make to detect the radar and can carry out nimble regulation according to detection angle, can adapt to the measurement demand under the different angles, provide wider range of application.

As the preference, protection dustproof subassembly is including link, spacing, fixed column and flexible apron, the outer end of link is equipped with spacing, the inside of link is equipped with the fixed column, the outer wall of fixed column is equipped with flexible apron, flexible apron is flexible along the outer end activity of fixed column, the holding tank that holds flexible apron has been seted up to the upper end of limiting plate, cover the radar through adopting flexible apron along the flexible regulation of fixed column outer end, cover and protect the radar completely when the device is not used, in order to avoid dust, debris or bad weather to the adverse effect of radar, avoid the device to use in the more easy environment that takes place debris to drop of dust simultaneously, hard debris drops can direct damage the shell and other key parts of device, increase device safety in utilization.

Preferably, the damping component is provided with a plurality of groups, the damping component is arranged along the lower end of the supporting platform in a surrounding manner, the damping component comprises a rubber plate, an auxiliary spring and a telescopic column, the telescopic column is arranged between the rubber plate and the supporting platen, the auxiliary spring is sleeved at the outer end of the telescopic column, spring damping is arranged on the inner side of the auxiliary spring, the auxiliary spring is sleeved on the telescopic column to provide damping for the device, external vibration and impact received by the device are relieved, impact caused by the external vibration is absorbed, key parts of the device are protected, damage and abrasion are reduced, and stability of the device in the working process is maintained.

The utility model has the beneficial effects that:

1. Compared with the traditional measuring device, the telescopic rod is connected through the bushing to assist the limiting plate to push the radar to stably lift and adjust, extra support is provided when the limiting plate is adjusted, the radar is kept stable in adjustment at different heights, the stability of the device is improved, the telescopic push rod is pushed by the air cylinder to push the radar to lift and adjust, automatic lifting and adjusting is achieved, the workload of manual operation is reduced, the operation efficiency is improved, and the measuring accuracy is improved.

2. Through adopting rotatory groove fixed semicircle slider to connect fixed block spacing detection radar, accurate control radar's motion scope and angle to realize more accurate and controllable multi-angle measurement, utilize driving motor drive rotary rod rotatory, the rotary rod drives the fixed block and connects detection radar along rotatory inslot portion rotation regulation angle, realize the accurate rotation control to the radar, thereby ensure to carry out high accuracy angle regulation and measurement to the target, make detection radar can carry out nimble regulation according to detection angle, can adapt to the measurement demand under the different angles, provide wider range of application.

3. Through adopting flexible apron to cover the radar along the flexible regulation of fixed column outer end, cover and protect the radar completely when the device is not used, in order to avoid dust, debris or bad weather to the adverse effect of radar, avoid the device to use in the more easy environment that takes place debris to drop of dust simultaneously, hard debris drops can direct damage the shell and other key parts of device, increase device safety in utilization, use the flexible post to establish auxiliary spring and provide the shock attenuation to the device, the outside vibrations and the impact that alleviate the device received, absorb the impact that outside vibrations brought, the key parts of protective apparatus, reduce damage and wearing and tearing, the stability of holding equipment in the course of the work.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of an angle adjusting assembly according to the present utility model;

FIG. 3 is a schematic view of a dustproof protection component according to the present utility model;

fig. 4 is a schematic structural view of the auxiliary supporting component of the present utility model.

Reference numerals illustrate: 1. a support platform; 2. an auxiliary support assembly; 201. a limiting block; 202. a fixed rod; 203. a bushing; 204. a telescopic rod; 3. a lifting assembly; 301. a cylinder; 302. a telescopic push rod; 4. an angle adjustment assembly; 401. a fixed block; 402. a rotating electric machine; 403. a rotating rod; 404. detecting a radar; 405. a slide bar; 406. a semicircular slide block; 5. a limiting plate; 6. protecting the dustproof component; 601. a connecting frame; 602. a limit bar; 603. fixing the column; 604. a retractable cover plate; 7. a shock absorbing assembly; 701. a rubber plate; 702. an auxiliary spring; 703. and (5) a telescopic column.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

Referring to fig. 1-4, the present utility model provides an embodiment: the millimeter wave radar deformation measuring device capable of being adjusted at multiple angles comprises a supporting platform 1, an auxiliary supporting component 2, a lifting component 3, an angle adjusting component 4, a limiting plate 5, a protection dustproof component 6 and a damping component 7; the limiting plate 5 of supporting radar is installed to supporting platform 1's top, the lifting unit 3 of adjusting limiting plate 5 height is installed at limiting plate 5's lower extreme center, install auxiliary supporting component 2 that auxiliary lifting unit 3 goes up and down to adjust between supporting platform 1 and the limiting plate 5, angle adjusting part 4 that fixed and drive radar angle of adjustment detected is installed at limiting plate 5's upper end center, protection dustproof subassembly 6 that protection radar avoided external impact and dust to invade is installed to angle adjusting part 4's outside, damping subassembly 7 that the damping device rocked is installed to supporting platform 1's lower extreme.

Referring to fig. 1-2, in this embodiment, the auxiliary supporting component 2 is provided with multiple groups, the multiple groups of auxiliary supporting components 2 are arranged around the upper end of the supporting platform 1, the auxiliary supporting component 2 comprises a limiting block 201, a fixing rod 202, a bushing 203 and a telescopic rod 204, the fixing rod 202 is located inside the limiting block 201, the bushing 203 is sleeved on the outer wall of the fixing rod 202, one end of the bushing 203 is provided with the telescopic rod 204, one end of the telescopic rod 204, far away from the bushing 203, is fixedly connected with the limiting plate 5, the telescopic rod 204 is connected with the limiting plate 5 through the bushing 203, the auxiliary limiting plate 5 pushes the radar to stably lift and adjust, additional support is provided when the limiting plate 5 is adjusted, the stability of the radar at different heights is maintained, the stability of the device is improved, the lifting component 3 comprises an air cylinder 301 and a telescopic push rod 302, the air cylinder 301 is located at the lower end of the supporting platform 1, the telescopic push rod 302 is arranged between the air cylinder 301 and the supporting platform 1, the telescopic push rod 302 extends to the upper end through the supporting platform 1 to be connected with the limiting plate 5, the automatic lifting and adjusting is realized through pushing the telescopic push rod 302 to lift and the radar by adopting the air cylinder 301 to push, the automatic lifting and the manual operation is reduced, the operating efficiency is improved, and the accuracy of measurement is improved.

Referring to fig. 2-3, in this embodiment, angle adjustment assembly 4 includes fixed block 401, rotating electrical machines 402, rotary rod 403, detect radar 404, slide bar 405 and semicircle slider 406, the rotary groove that holds angle adjustment assembly 4 has been seted up to the upper end of limiting plate 5, fixed block 401 is located the top of rotary groove, the outer end of fixed block 401 is equipped with detects radar 404, the lower extreme of fixed block 401 is equipped with semicircle slider 406, through adopting rotary groove fixed semicircle slider 406 to connect fixed block 401 spacing detect radar 404, the motion scope and the angle of accurate control radar, thereby realize more accurate and controllable multi-angle measurement, the inside of semicircle slider 406 is equipped with slide bar 405, slide bar 405 passes semicircle slider 406 and extends to the rotary groove inner wall, the sliding groove that holds slide bar 405 and slide is equipped with driving motor in the top of fixed block 401, be equipped with rotary rod 403 between the driving motor with fixed block 401, rotary rod 403 passes the inside that fixed block 401 extends to limiting plate 5, through adopting driving motor to drive rotary rod 403 to rotate, the fixed block 401 is connected and is detected radar 404 along the inside rotation adjustment angle of rotary groove, thereby realize the accurate and can not carry out the angle adjustment to the radar, thereby can guarantee the accurate measurement with the accurate angle adjustment, can not be adjusted with the angle is realized, can be adjusted with the angle according to the needs, the accuracy is adjusted.

Referring to fig. 2-4, in this embodiment, protection dustproof component 6 is including link 601, spacing 602, fixed column 603 and flexible apron 604, the outer end of link 601 is equipped with spacing 602, the inside of link 601 is equipped with fixed column 603, the outer wall of fixed column 603 is equipped with flexible apron 604, flexible apron 604 is flexible along the outer end activity of fixed column 603, the holding tank that holds flexible apron 604 has been seted up to the upper end of limiting plate 5, through adopting flexible apron 604 to cover the radar along the flexible regulation of fixed column 603 outer end, cover and protect the radar completely when the device is not used, in order to avoid dust, debris or adverse weather to the adverse effect of radar, avoid the device to use in the more easy environment that takes place debris drop of dust, hard debris drop can direct damage the shell and other key parts of device, increase device safety in utilization, damper 7 is equipped with the multiunit, multiunit damper 7 is around setting along the lower end of supporting platform 1, damper 7 is equipped with the rubber plate, auxiliary spring 702 and flexible post 703, be equipped with between the rubber plate and the supporting platen, the outer end of spring 703 is equipped with the auxiliary spring 702, the outer sleeve that is equipped with auxiliary spring 703 is equipped with, the outside damping device that is equipped with the auxiliary spring 703 is used, the outside damping device is worn and damaged to the outside the key device is provided with the auxiliary spring 703, the outside damping device is reduced, the outside damping device is used to the damping device is protected, the outside is protected the device is worn and is damaged to the auxiliary device is provided.

During operation, the detection radar 404 is firstly installed in the rotating groove at the upper end of the limiting plate 5, after the detection radar 404 is fixed, the telescopic push rod 302 is used for supporting the center of the bottom of the limiting plate 5, meanwhile, multiple groups of telescopic rods 204 are used for auxiliary connection and fixation, after the detection radar 404 is fixed, the detection radar 404 is moved to a detection position, the telescopic column 703 is used for sleeving the auxiliary spring 702 to provide shock absorption for the bottom of the device, shock brought by external shock is absorbed, key parts of equipment are protected, damage and abrasion are reduced, after the detection radar 404 is carried to a designated position, the cylinder 301 is used for pushing the telescopic push rod 302 to push the limiting plate 5 to lift and adjust along the upper end of the supporting platform 1, meanwhile, the telescopic rod 204 stretches and slides along the inside of the bushing 203, the auxiliary limiting plate 5 pushes the radar to stably lift and adjust, the bushing 203 can rotate along the outer side of the fixed rod 202, the lifting and tilting angle of the telescopic push rod 302 is followed, the lifting joint is provided for the limiting plate 5 to adjust, and stability of the radar at different heights is kept.

After limiting plate 5 drives detection radar 404 to adjust to the assigned position, start driving motor drive rotary rod 403 is rotatory, rotary rod 403 drives the inside slide bar 405 of semicircle slider 406 and rotates clockwise along the sliding tray inboard, make detection radar 404 along the inside rotatory regulation detection angle of rotary tray, realize the accurate rotary control to the radar, ensure to carry out high accuracy angle adjustment and measurement to the target, make detection radar 404 can carry out nimble regulation according to the detection angle, can adapt to the measurement demand under the different angles, provide more extensive detection range and detect deformation degree, before detection radar 404 detects, stir flexible apron 604 and open along the flexible regulation of fixed column 603 outer end, make the radar spill detect, reverse stir when the device does not use, with flexible apron 604 joint in limiting plate 5 upper end holding tank, cover and protect the radar completely, prevent that hard debris from dropping can directly damage the shell of device and other key parts, realize the multi-angle radar angle adjustment and measure deformation.

Through the steps, the bushing 203 is adopted to connect the telescopic rod 204 to assist the limiting plate 5 to push the radar to stably lift and adjust, extra support is provided when the limiting plate 5 is adjusted, the radar is kept stable at different heights, the stability of the device is improved, the telescopic push rod 302 is pushed by the air cylinder 301 to push the radar to lift and adjust, automatic lifting and adjusting are realized, the workload of manual operation is reduced, the operation efficiency is improved, the accuracy of measurement is improved, the fixed block 401 is connected with the rotary groove fixed semicircular slide block 406 to limit the detection radar 404, the movement range and the angle of the radar are precisely controlled, more precise and controllable multi-angle measurement is realized, the rotary rod 403 is driven by the driving motor to rotate, the fixed block 401 is driven by the rotary rod 403 to connect the detection radar 404 to rotate along the inside of the rotary groove to adjust the detection angle, the precise rotation control of the radar is realized, thereby ensuring high-precision angle adjustment and measurement on a target, enabling the detection radar 404 to flexibly adjust according to the detection angle, adapting to measurement requirements under different angles, providing wider application range, covering the radar along the outer end of the fixed column 603 by adopting the telescopic cover plate 604 for telescopic adjustment, completely covering and protecting the radar when the device is not in use, avoiding adverse effects of dust, sundries or bad weather on the radar, simultaneously avoiding that the device is used in an environment where the dust is more prone to falling of sundries, the shell and other key parts of the device can be directly damaged by the falling of the hard sundries, increasing the use safety of the device, providing shock absorption for the device by using the telescopic column 703 to sleeve the auxiliary spring 702, absorbing the shock brought by the external shock, protecting the key parts of equipment, reducing damage and abrasion, maintaining the stability of the device during operation.

The embodiments of the present utility model have been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model.

Claims (7)

1. The millimeter wave radar deformation measuring device capable of being adjusted at multiple angles comprises a supporting platform (1); the method is characterized in that: the device also comprises an auxiliary supporting component (2), a lifting component (3), an angle adjusting component (4), a limiting plate (5), a protection dustproof component (6) and a damping component (7); limiting plate (5) supporting radar is installed to the top of supporting platform (1), lifting unit (3) of adjusting limiting plate (5) height are installed at the lower extreme center of limiting plate (5), install auxiliary supporting unit (2) that auxiliary lifting unit (3) goes up and down to adjust between supporting platform (1) and limiting plate (5), angle adjusting unit (4) that fixed and drive radar angle of adjustment detected are installed at the upper end center of limiting plate (5), protection dustproof subassembly (6) that protection radar avoided external impact and dust to invade is installed in the outside of angle adjusting unit (4), damping unit (7) that slowing down the device rocked are installed to the lower extreme of supporting platform (1).

2. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 1, wherein: auxiliary stay subassembly (2) are equipped with multiunit, multiunit auxiliary stay subassembly (2) are around setting along the upper end of supporting platform (1), auxiliary stay subassembly (2) are including stopper (201), dead lever (202), bush (203) and telescopic link (204), dead lever (202) are located the inside of stopper (201), the outer wall cover of dead lever (202) is equipped with bush (203), the one end of bush (203) is equipped with telescopic link (204), the one end and limiting plate (5) fixed connection of bush (203) are kept away from to telescopic link (204).

3. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 1, wherein: the lifting assembly (3) comprises an air cylinder (301) and a telescopic push rod (302), wherein the air cylinder (301) is located at the lower end of the supporting platform (1), the telescopic push rod (302) is arranged between the air cylinder (301) and the supporting platform (1), and the telescopic push rod (302) penetrates through the supporting platform (1) to extend to the upper end to be connected with the limiting plate (5).

4. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 1, wherein: the angle adjusting assembly (4) comprises a fixed block (401), a rotating motor (402), a rotating rod (403), a detection radar (404), a sliding rod (405) and a semicircular sliding block (406), a rotating groove for accommodating the angle adjusting assembly (4) is formed in the upper end of the limiting plate (5), the fixed block (401) is located above the rotating groove, the outer end of the fixed block (401) is provided with the detection radar (404), and the lower end of the fixed block (401) is provided with the semicircular sliding block (406).

5. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 4, wherein: the inside of semicircle slider (406) is equipped with slide bar (405), and slide bar (405) pass semicircle slider (406) and extend to rotatory inslot wall, and the gliding sliding tray of holding slide bar (405) has been seted up to the inner wall in rotatory groove, and the top of fixed block (401) is equipped with driving motor, is equipped with rotary rod (403) between driving motor and fixed block (401), and rotary rod (403) pass the inside that fixed block (401) extended to limiting plate (5).

6. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 1, wherein: the protection dustproof assembly (6) comprises a connecting frame (601), limiting strips (602), fixing columns (603) and a telescopic cover plate (604), wherein the limiting strips (602) are arranged at the outer ends of the connecting frame (601), the fixing columns (603) are arranged in the connecting frame (601), the telescopic cover plate (604) is arranged on the outer wall of the fixing columns (603), the telescopic cover plate (604) stretches out and draws back along the outer end of the fixing columns (603), and a containing groove for containing the telescopic cover plate (604) is formed in the upper end of the limiting plate (5).

7. The multi-angle adjustable millimeter wave radar deformation measuring device according to claim 1, wherein: the shock-absorbing assembly (7) is provided with a plurality of groups, the shock-absorbing assembly (7) is arranged along the lower end of the supporting platform (1) in a surrounding mode, the shock-absorbing assembly (7) comprises a rubber plate (701), an auxiliary spring (702) and a telescopic column (703), the telescopic column (703) is arranged between the rubber plate (701) and the supporting platen, the auxiliary spring (702) is sleeved at the outer end of the telescopic column (703), and spring damping is arranged at the inner side of the auxiliary spring (702).