CN213769010U

CN213769010U - Buffer and unmanned aerial vehicle landing platform comprising same

Info

Publication number: CN213769010U
Application number: CN202022707615.1U
Authority: CN
Inventors: 张鸿飞; 夏金周; 戚佳东; 张帅
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-07-23
Anticipated expiration: 2030-11-20

Abstract

The invention discloses a buffer device and an unmanned aerial vehicle landing platform comprising the same, wherein two ends of the buffer device are respectively connected to a supporting plate or a base of the unmanned aerial vehicle landing platform, the buffer device comprises a resetting mechanism and a sliding mechanism which slides back and forth relative to the supporting plate, the resetting mechanism is connected to the sliding mechanism and is compressed or stretched along with the sliding of the sliding mechanism, the buffer device also comprises a locking mechanism, one end of the locking mechanism is fixed on the supporting plate or the base, and the other end of the locking mechanism can slide along the direction close to the sliding mechanism and is clamped with the sliding mechanism to limit the sliding of the sliding mechanism; the other end of the locking mechanism can also slide in a direction away from the sliding mechanism and be disengaged from the sliding mechanism. Carry out the locking through locking mechanical system to sliding mechanism to avoid the resilience force of the return mechanism among the aircraft whereabouts in-process buffer to cause the injury to unmanned aerial vehicle.

Description

Buffer and unmanned aerial vehicle landing platform comprising same

Technical Field

The invention relates to the technical field of unmanned aerial vehicles, in particular to a buffering device and an unmanned aerial vehicle landing platform comprising the same.

Background

An unmanned aircraft, abbreviated as "drone" in english and abbreviated as "UAV", is an unmanned aircraft that is operated by means of a radio remote control device and a self-contained program control device, or is operated autonomously, either completely or intermittently, by an onboard computer, and is often better suited to perform dangerous tasks than a piloted aircraft. Because the territory area of our country is great, and many topography relief are all very complicated, when there is not way omnidirectional surveying, alright gather in order to utilize the data of aerial survey unmanned aerial vehicle to the topography.

After the unmanned aerial vehicle finishes data acquisition, a landing platform is needed to enable the unmanned aerial vehicle to land safely, most of existing unmanned aerial vehicle landing platforms adopt springs to buffer the falling inertia of the unmanned aerial vehicle, but the resilience of the springs often causes secondary damage to the unmanned aerial vehicle; and if the unmanned aerial vehicle meets a gust of wind in the falling process, the unmanned aerial vehicle deviates from the original falling route, and then the unmanned aerial vehicle needs to be lifted again and lands again.

Disclosure of Invention

The invention provides a buffering device and an unmanned aerial vehicle landing platform comprising the same, and aims to overcome the defects that an unmanned aerial vehicle landing platform in the prior art only adopts a spring to buffer the inertia of the unmanned aerial vehicle landing and the resilience of the spring causes secondary damage to the unmanned aerial vehicle.

The invention solves the technical problems through the following technical scheme:

a buffer device, the two ends of the buffer device are respectively connected with two oppositely arranged supporting plates on an unmanned aerial vehicle landing platform, or the two ends of the buffer device are respectively connected with the supporting plates and a base of the unmanned aerial vehicle landing platform, the buffer device comprises a reset mechanism and a sliding mechanism which slides back and forth relative to the supporting plates, the reset mechanism is connected with the sliding mechanism and is compressed or stretched along with the sliding of the sliding mechanism, the buffer device is characterized in that,

the buffer device further comprises a locking mechanism, one end of the locking mechanism is fixed to the supporting plate or the base, and the other end of the locking mechanism can slide along the direction close to the sliding mechanism and is clamped with the sliding mechanism to limit the sliding of the sliding mechanism; the other end of the locking mechanism can also slide in a direction away from the sliding mechanism and is disengaged from the sliding mechanism.

Preferably, the locking mechanism includes a housing and a locking lever, the housing is fixed to the support plate or the base, one end of the locking lever is slidably disposed in the housing, and an end of the other end of the locking lever is in clamping connection with the sliding mechanism or is separated from the sliding mechanism.

Preferably, the locking mechanism further includes a first elastic element, the first elastic element is sleeved on the locking rod, and the first elastic element is compressed by the locking rod, or the first elastic element applies a restoring force to the locking rod to move the locking rod in a direction close to the sliding mechanism.

Preferably, the locking mechanism further includes a positioning plate fixed to the locking rod and located in the housing, and two ends of the first elastic element respectively abut against the positioning plate and an inner bottom surface of the housing.

Preferably, the locking mechanism further comprises a pull rod, the pull rod is fixed at the bottom of the locking rod, and the extending direction of the pull rod is perpendicular to the extending direction of the locking rod.

Preferably, the sliding mechanism comprises a sliding rod, a plurality of positioning grooves are arranged on the sliding rod at intervals along the length direction of the sliding rod, and the locking rod is clamped with the positioning grooves.

Preferably, the positioning groove is provided with a first guiding and sliding portion, the locking rod is provided with a second guiding and sliding portion, and the first guiding and sliding portion is matched with the second guiding and sliding portion.

Preferably, the sliding mechanism further comprises a fixed block, a connecting block and a push rod, the fixed block is fixed on the base, the sliding rod penetrates through a hole in the fixed block and is connected with the fixed block in a sliding mode, the connecting block is fixed on the sliding rod, the push rod is hinged with the connecting block, and one end, away from the connecting block, of the push rod is hinged with the supporting plate;

or, the fixed block is fixed in the backup pad, the slide bar pass on the fixed block hole with fixed block sliding connection, the connecting block is fixed in the slide bar, the push rod with the connecting block is articulated, the push rod deviate from the one end of connecting block with the base is articulated.

Preferably, the reset mechanism includes a second elastic element and a reset block, the reset block is fixed to the sliding rod, the second elastic element is sleeved on the sliding rod, and two ends of the second elastic element respectively abut against one side of the reset block and one side of the supporting plate.

Preferably, a first guide limiting groove is formed in the supporting plate, and the end of the reset block is slidably arranged in the first guide limiting groove.

Preferably, a first protruding block is fixed at an end of the reset block, first limiting plates are fixed at two sides of an opening of the first guiding limiting groove, the first protruding block is located in the first guiding limiting groove, and the first limiting plate limits the first protruding block to be separated from the first guiding limiting groove.

Preferably, a second limiting plate is further fixed to the supporting plate, and one end, away from the reset block, of the second elastic element abuts against the second limiting plate.

The utility model provides an unmanned aerial vehicle landing platform, includes base and backup pad, its characterized in that, it contains as above buffer, each unmanned aerial vehicle landing platform contains a plurality ofly buffer.

Preferably, unmanned aerial vehicle descending platform includes two backup pads, two the backup pad sets up relatively, two the backup pad passes through buffer connects, is located the top the backup pad can be to being close to or keeping away from and being located the below the direction of backup pad removes.

Preferably, unmanned aerial vehicle descending platform still includes position control device, position control device one end is fixed in the base, position control device's the other end connect in be located the below the backup pad, be located the below the backup pad passes through position control device can be along the transverse direction or the longitudinal direction removal of base.

Preferably, the position adjusting device includes a telescopic rod, one end of the telescopic rod is fixed to the base, the other end of the telescopic rod is connected to the support plate located below, and the telescopic rod can be extended or compressed along the axial direction thereof.

Preferably, the position adjusting device further comprises a supporting member, a second guiding and limiting groove is formed in the supporting member, a second protruding block is fixed at the end of the telescopic rod, and the second protruding block is slidably arranged in the second guiding and limiting groove.

Preferably, the base is provided with an accommodating cavity with an open top, the bottom end of the supporting piece is located in the accommodating cavity, the position adjusting device further comprises a fixing plate, the fixing plate is fixed on the base, and one end of the telescopic rod, which deviates from the supporting piece, is fixed on the fixing plate.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: the utility model discloses a buffer fixes in the backup pad or on the base through the one end with a locking mechanism, with its other end and buffer's sliding mechanism joint or break away from in order to realize that locking mechanism carries out the locking to sliding mechanism's slip, and then avoids the resilience force of the answer mechanism among the aircraft whereabouts in-process buffer to cause the injury to unmanned aerial vehicle.

Drawings

Fig. 1 is the utility model discloses preferred embodiment's unmanned aerial vehicle landing platform's that contains buffer structure schematic diagram.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1.

Fig. 3 is an enlarged schematic view of a portion B in fig. 1.

Description of reference numerals:

base 1

Position adjusting device 2

Fixing plate 21

Telescopic rod 22

Accommodating cavity 23

Support 24

Second guide limit groove 25

Second bump 26

Sliding mechanism 3

Supporting plate 31

Fixed block 32

Slide bar 33

Connecting block 34

Push rod 35

Resetting mechanism 4

First guide limit groove 41

First bump 42

Reset block 43

Second elastic element 44

Second limit plate 45

Locking mechanism 5

Housing 51

Locking lever 52

First elastic element 53

Positioning plate 54

Pull rod 55

Positioning slot 56

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 1 to 3, this embodiment provides a buffer device, sets up on unmanned aerial vehicle descends the platform for when unmanned aerial vehicle descends, cushion unmanned aerial vehicle's inertia. Unmanned aerial vehicle descending platform includes backup pad 31 and base 1, connects through buffer between backup pad 31 and the base 1. The both ends of buffer connect respectively in the backup pad 31 of two relative settings on unmanned aerial vehicle descending platform, perhaps, buffer's both ends connect respectively in the backup pad and the base 1 on unmanned aerial vehicle descending platform.

The buffer device comprises a reset mechanism 4 and a sliding mechanism 3 which slides back and forth relative to the support plate 31, wherein the reset mechanism 4 is connected with the sliding mechanism 3 and is compressed or stretched along with the sliding of the sliding mechanism 3. The buffer device further comprises a locking mechanism 5, one end of the locking mechanism 5 is fixed on the support plate 31 or the base 1, and the other end of the locking mechanism 5 can slide along the direction close to the sliding mechanism 3 and is clamped with the sliding mechanism 3 so as to limit the sliding mechanism 3 to slide; the other end of the lock mechanism 5 is also slidable in a direction away from the slide mechanism 3 and disengaged from the slide mechanism 3.

Absorb the kinetic energy that unmanned aerial vehicle descends the in-process and produce through the cooperation of slide mechanism 3 and canceling release mechanical system 4, carry out the locking to slide mechanism 3 through locking mechanical system 5, and then carry out the locking to canceling release mechanical system 4 to prevent that unmanned aerial vehicle from descending the restoring force drive slide mechanism 3 of canceling release mechanical system 4 after targetting in place and sliding, and then drive backup pad 31 and kick-back and lead to causing the injury to unmanned aerial vehicle.

The locking mechanism 5 includes a housing 51 fixed to the support plate 31 or the base 1, and a locking lever 52, one end of which is slidably disposed in the housing, and an end of the other end of the locking lever 52 is engaged with the sliding mechanism 3 or disengaged from the sliding mechanism 3. The mechanism of the housing is not limited, and in this embodiment, the housing has a cylindrical structure, and the locking rod 52 passes through holes in the upper and lower covers of the housing and slides back and forth along the axial direction of the housing 51.

The locking mechanism 5 further includes a first elastic element 53, the first elastic element 53 is sleeved on the locking rod 52, the first elastic element 53 is compressed by the locking rod 52, or the first elastic element 53 applies a restoring force to the locking rod 52 to move the locking rod 52 to a direction approaching the sliding mechanism 3. Wherein, the first elastic element 53 is a spring. The locking mechanism 5 further comprises a positioning plate 54, and a through hole is formed in the middle of the positioning plate 54, and the locking rod 52 passes through the through hole to be fixed with the positioning plate 54. The positioning disc 54 and the locking rod 52 can be fixed through threaded connection, that is, an internal thread is arranged in a through hole of the positioning disc 54, an external thread is arranged on the locking rod 52, and the positioning disc 54 and the locking rod 52 are fixed through threaded matching; the fixing may also be performed by welding. The positioning disc 54 is located inside the housing, and both ends of the first elastic element 53 respectively abut against the positioning disc 54 and the inner bottom surface of the housing 51. The locking mechanism 5 further includes a pull rod 55, the pull rod 55 is fixed to the bottom of the locking rod 52, and the extension direction of the pull rod 55 is perpendicular to the extension direction of the locking rod 52. The pull rod 55 is used for limiting the locking rod 52, and the pull rod 55 is also used for facilitating the force application to the locking rod 52 during unlocking.

Wherein, slide mechanism 3 includes slide bar 33, fixed block 32, connecting block 34 and push rod 35, and fixed block 32 fixes on base 1, and slide bar 33 passes hole and fixed block 32 sliding connection on the fixed block 32, and connecting block 34 is fixed with slide bar 33, and push rod 35 is articulated with connecting block 34, and push rod 35 deviates from the one end of connecting block 34 and base 1 is articulated. It is also possible that the fixing block 32 is fixed on the supporting plate 31, and one end of the push rod 35 departing from the connecting block 34 is hinged with the base 1. In this embodiment, two buffer devices are connected to the bottom surface of the support plate 31, and two buffer devices are connected to the top of the base 1. The fixing block 32 of the slide mechanism 3 connected to the base 1 is fixed to the base 1, and the fixing block 32 of the slide mechanism 3 connected to the support plate 31 is fixed to the support plate 31. One ends of the four push rods 35 are respectively hinged with the connecting block 34, and the ends of the four push rods 35, which are far away from the connecting block 34, are hinged with each other, so that a cross structure as shown in fig. 3 is formed. When the aircraft lands on support plate 31, the aircraft applies a downward pressure to support plate 31, causing support plate 31 to move downward, which in turn causes pushrod 35 to rotate. The pushing rod 35 applies a pushing force to the connecting block 34 to move the connecting block 34 in the direction of the pushing force, so as to drive the sliding rod 33 to slide relative to the fixed block 32. A plurality of positioning grooves 56 are formed at intervals along the length of the slide rod 33, and the locking lever 52 is engaged with the positioning grooves 56 to prevent the slide rod 33 from further sliding. The positioning groove 56 is provided with a first guiding sliding part, the locking lever 52 is provided with a second guiding sliding part, and the first guiding sliding part is matched with the second guiding sliding part. As shown in fig. 2, the first reverse sliding portion is an arc structure of one side of the positioning groove 56, and the second guide sliding portion is an arc structure of the end portion of the locking lever 52.

The reset mechanism 4 includes a second elastic element 44 and a reset block 43, the reset block 43 is fixed to the sliding rod 33, the second elastic element 44 is sleeved on the sliding rod 33, and two ends of the second elastic element 44 respectively abut against one side of the reset block 43 and one side of the supporting plate 31. In an embodiment, the second elastic element 44 is a spring. The restoring force of the second elastic element 44 provides resistance to the sliding of the sliding rod 33, when the pushing force exerted by the pushing rod 35 on the connecting block 34 is greater than the resilience force of the second elastic element 44, the second elastic element 44 is compressed, and the generated elastic deformation of the second elastic element 44 absorbs the kinetic energy of the downward movement of the support 24, in other words, the second elastic element 44 buffers the inertia generated by the descent of the drone; when push rod 35 applys thrust on connecting block 34 and is less than second elastic element 44's resilience force, second elastic element 44 kick-backs, and at this moment, if not locking slide bar 33, backup pad 31 will upwards move under second elastic element 44's restoring force, and then cause the injury to unmanned aerial vehicle. In the present embodiment, the lock mechanism 5 locks the slide lever 33, and this is avoided.

When the locked sliding mechanism 3 needs to be unlocked, the pull rod 55 is pulled downwards, so that the locking rod 52 is separated from the sliding rod 33, at this time, the restoring force of the second elastic element 44 drives the restoring piece to rebound, the restoring piece drives the sliding rod 33 to slide along the movement direction of the restoring piece, meanwhile, the push rod 35 is driven to slide along the restoring direction of the restoring piece, the push rod 35 can drive the support plate 31 to move upwards, and then the position of the support plate 31 is restored.

In order to limit and guide the reset block 43 and the second elastic element 44, a first guide limiting groove 41 is formed in the support plate 31 or the base 1, and an end of the reset block 43 is slidably disposed in the first guide limiting groove 41. A first protrusion 42 is fixed at an end of the reset block 43, first limiting plates are fixed at two sides of an opening of the first guiding limiting groove 41, the first protrusion 42 is located in the first guiding limiting groove 41, and the first limiting plates limit the first protrusion 42 to be separated from the first guiding limiting groove 41. A second limiting plate 45 is further fixed on the supporting plate 31, and one end of the second elastic element 44 departing from the reset block 43 abuts against the second limiting plate 45.

As shown in fig. 1, the present embodiment further provides an unmanned aerial vehicle landing platform, which includes a base 1 and a supporting plate 31, and includes the above buffering devices, and each unmanned aerial vehicle landing platform includes a plurality of buffering devices.

In this embodiment, unmanned aerial vehicle landing platform includes two backup pads 31, and two backup pads 31 set up relatively, and two backup pads 31 pass through buffer and connect, and the backup pad 31 that is located the top can be to being close to or keeping away from the direction removal of the backup pad 31 that is located the below.

Unmanned aerial vehicle descending platform still includes

position control device

2, and 2 one end of position control device are fixed in base 1, and position control device 2's the other end is connected in the backup pad 31 that is located the below, and the backup pad 31 that is located the below can be along the horizontal direction or the longitudinal direction removal of base 1 through position control device 2. The position adjusting device 2 comprises an expansion link 22, one end of the expansion link 22 is fixed on the base 1, the other end of the expansion link 22 is connected to the support plate 31, the expansion link 22 can be extended or compressed along the axial direction of the expansion link 22, and the expansion link 22 is an electric expansion link 22.

The position adjusting device 2 further comprises a supporting member 24, a second guiding and limiting groove 25 is formed in the supporting member 24, a second protruding block 26 is fixed at the end portion of the telescopic rod 22, and the second protruding block 26 is slidably arranged in the second guiding and limiting groove 25. The base 1 is provided with an accommodating cavity 23 with an open top, the bottom end of the supporting piece 24 is positioned in the accommodating cavity 23, the position adjusting device 2 further comprises a fixing plate 21, the fixing plate 21 is fixed on the base 1, and one end of the telescopic rod 22 departing from the supporting piece 24 is fixed on the fixing plate 21.

In the present embodiment, two position adjusting devices 2 are provided between the lower support plate 31 and the base 1, and the two position adjusting devices 2 control the position adjustment of the support plate 31 in the lateral direction and the position adjustment in the longitudinal direction, respectively. When the position in the transverse direction needs to be adjusted, the support member 24 is pushed or pulled to slide in the transverse direction in the accommodating cavity by stretching or compressing the electric telescopic rod 22, and the support plate 31 is further pushed or pulled to slide in the transverse direction, in the process, the electric telescopic rod 22 in the position adjusting device 2 for controlling the longitudinal sliding of the support plate 31 does not act, but the electric telescopic rod 22 slides in the transverse direction along the accommodating cavity on the support member 24. When the position adjustment in the longitudinal direction of the support plate 31 is required, the working principle is the same.

The unmanned aerial vehicle landing platform that this embodiment provided, simple structure, can adjust the position of backup pad 31 through electric telescopic handle, thereby when the skew backup pad 31 of unmanned aerial vehicle whereabouts, can adjust the position of backup pad 31, thereby avoid needing to carry out the trouble that rises and falls again to unmanned aerial vehicle, and lock slide mechanism 3 and canceling release mechanical system 4 through locking mechanical system 5, the resilience after avoiding second elastic element 44 to contract can cause the injury to unmanned aerial vehicle.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A buffer device, the two ends of the buffer device are respectively connected with two oppositely arranged supporting plates on an unmanned aerial vehicle landing platform, or the two ends of the buffer device are respectively connected with the supporting plates and a base of the unmanned aerial vehicle landing platform, the buffer device comprises a reset mechanism and a sliding mechanism which slides back and forth relative to the supporting plates, the reset mechanism is connected with the sliding mechanism and is compressed or stretched along with the sliding of the sliding mechanism, the buffer device is characterized in that,

2. The damping device according to claim 1, wherein the locking mechanism includes a housing and a locking lever, the housing is fixed to the support plate or the base, one end of the locking lever is slidably disposed in the housing, and an end of the other end of the locking lever is engaged with or disengaged from the sliding mechanism.

3. The damper of claim 2, wherein the lock mechanism further comprises a first resilient member that is fitted over the lock lever, the first resilient member being compressed by the lock lever, or the first resilient member applying a return force to the lock lever to move the lock lever in a direction approaching the slide mechanism.

4. The damper of claim 3, wherein the locking mechanism further comprises a positioning plate fixed to the locking lever and located within the housing, and wherein both ends of the first resilient element abut against the positioning plate and an inner bottom surface of the housing, respectively.

5. The draft gear according to claim 3, wherein said lock mechanism further comprises a pull rod fixed to a bottom of said lock lever, said pull rod extending in a direction perpendicular to an extending direction of said lock lever.

6. The draft gear according to claim 2, wherein said slide mechanism includes a slide bar having a plurality of positioning grooves formed therein at intervals along a length thereof, said lock lever being engaged with said positioning grooves.

7. The draft gear according to claim 6, wherein a first slide guide portion is provided on said positioning groove, a second slide guide portion is provided on said lock lever, and said first slide guide portion is engaged with said second slide guide portion.

8. The damping device according to claim 6, wherein the sliding mechanism further comprises a fixed block, a connecting block and a push rod, the fixed block is fixed on the base, the sliding rod passes through a hole on the fixed block and is slidably connected with the fixed block, the connecting block is fixed on the sliding rod, the push rod is hinged with the connecting block, and one end of the push rod, which is far away from the connecting block, is hinged with the supporting plate;

9. The damping device according to claim 6, wherein the restoring mechanism includes a second elastic element and a restoring block, the restoring block is fixed to the sliding rod, the second elastic element is sleeved on the sliding rod, and two ends of the second elastic element respectively abut against one side of the restoring block and one side of the supporting plate.

10. The damping device according to claim 9, wherein the support plate is provided with a first guiding and limiting groove, and an end of the reset block is slidably disposed in the first guiding and limiting groove.

11. The damping device according to claim 10, wherein a first protrusion is fixed to an end of the reset block, first position-limiting plates are fixed to two sides of an opening of the first guiding-limiting groove, the first protrusion is located in the first guiding-limiting groove, and the first position-limiting plate limits the first protrusion from being separated from the first guiding-limiting groove.

12. The damping device according to claim 9, wherein a second limiting plate is further fixed to the supporting plate, and an end of the second elastic element, which is away from the reset block, abuts against the second limiting plate.

13. An unmanned aerial vehicle landing platform comprising a base and a support plate, wherein the unmanned aerial vehicle landing platform comprises a plurality of cushioning devices as claimed in any one of claims 1 to 12.

14. An unmanned aerial vehicle landing platform of claim 13, wherein the unmanned aerial vehicle landing platform comprises two support plates, two of the support plates are disposed opposite to each other, the two support plates are connected through the buffering device, and the support plate located above can move towards a direction close to or away from the support plate located below.

15. An unmanned aerial vehicle landing platform of claim 14, further comprising a position adjustment device, one end of the position adjustment device being fixed to the base, the other end of the position adjustment device being connected to the support plate located below, the support plate located below being movable along a lateral or longitudinal direction of the base by the position adjustment device.

16. An unmanned aerial vehicle landing platform of claim 15, wherein the position adjustment device comprises a telescoping rod, one end of the telescoping rod is fixed to the base, the other end of the telescoping rod is connected to the support plate below, and the telescoping rod can be extended or compressed along its axial direction.

17. An unmanned aerial vehicle landing platform of claim 16, wherein the position adjustment device further comprises a support member, the support member is provided with a second guiding and limiting groove, the end of the telescopic rod is fixed with a second projection, and the second projection is slidably disposed in the second guiding and limiting groove.

18. An unmanned aerial vehicle landing platform of claim 17, wherein the base is provided with an accommodating cavity with an open top, the bottom end of the support member is located in the accommodating cavity, the position adjustment device further comprises a fixing plate, the fixing plate is fixed to the base, and one end of the telescopic rod, which is far away from the support member, is fixed to the fixing plate.