CN220135161U

CN220135161U - Support frame

Info

Publication number: CN220135161U
Application number: CN202321071518.5U
Authority: CN
Inventors: 邹青青; 袁然亮
Original assignee: Shenzhen Weiji Technology Co ltd
Current assignee: Shenzhen Weiji Technology Co ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2023-12-05
Anticipated expiration: 2033-05-06

Abstract

The embodiment of the utility model discloses a bracket, which comprises a support arm assembly and a driving assembly, wherein the support arm assembly comprises a plurality of support arms which are sequentially connected, and two adjacent support arms can relatively rotate so as to enable the support arm assembly to be switched between different states; the driving assembly is arranged at the joint of the two adjacent supporting arms and comprises a main body, a rotating rod and a driving piece, wherein the main body comprises a first limiting disc and a second limiting disc which are axially arranged; the bull stick rotationally wears to establish the main part along circumference, and the bull stick includes the body of rod and the stop block in the body of rod outside is located to the cover, and the both ends of the body of rod are connected with two adjacent support arms respectively, and the stop block is located between first spacing dish and the second spacing dish, and the driving piece can drive first spacing dish and second spacing dish and move towards being close to each other or the direction that keeps away from to make first spacing dish and second spacing dish centre gripping or loosen the stop block, thereby rotate along circumference or remove bull stick along circumference pivoted restriction with restriction in order to restrict the bull stick.

Description

Support frame

Technical Field

The utility model relates to the technical field of brackets, in particular to a bracket.

Background

The traditional support is usually provided with a spring or a damping structure at the joint of two adjacent support arms to realize locking of the support arms so as to fix the support arms to hover at a certain angle, however, due to the fact that the pretightening force provided for the support arms by the spring or the damping structure is relatively weak, the support arms are often difficult to lock stably, and the support arms for installing loads are easy to shake in the actual use process.

Disclosure of Invention

Based on this, it is necessary to provide a bracket capable of improving the locking stability of the support arm.

A stent, comprising:

the support arm assembly comprises a plurality of support arms which are connected in sequence, and two adjacent support arms can rotate relatively so as to enable the support arm assembly to be switched between different states; and

the driving assembly is arranged at the joint of two adjacent supporting arms and comprises a main body, a rotating rod and a driving piece, wherein the main body comprises a first limiting disc and a second limiting disc which are axially arranged; the rotary rod rotationally wears to establish along circumference the main part, the rotary rod includes the body of rod and cover are located the stop block in the body of rod outside, the both ends of the body of rod are connected with two adjacent support arms respectively, the stop block is located first spacing dish with between the second spacing dish, the driving piece with at least one transmission connection in first spacing dish and the second spacing dish, the driving piece can drive first spacing dish with the second spacing dish is towards being close to each other or the direction that keeps away from removes, so that first spacing dish with second spacing dish centre gripping or loosen the stop block, thereby with restriction the rotary rod is rotated along circumference or is released the restriction of rotation along circumference of rotary rod, and then with restriction two adjacent support arms's relative rotation, perhaps release the restriction of relative rotation of two adjacent support arms.

In one embodiment, the driving member can drive the first limiting disc to rotate along the circumferential direction, and the first limiting disc can also axially approach and abut against the stop block to limit the rotation of the rotating rod along the circumferential direction while the first limiting disc rotates along the circumferential direction.

In one embodiment, the first limiting disc comprises a plurality of first driving parts distributed along the circumferential direction, the main body further comprises a sleeve and a first limiting structure arranged between the sleeve and the first limiting disc, the first limiting structure comprises a plurality of first limiting parts distributed along the circumferential direction, the first limiting parts are provided with first transition surfaces, and the thickness of each first limiting part in the axial direction of the area where the first transition surface is located is gradually increased along the opposite direction; the first limiting plate is provided with a plurality of first spherical holes distributed along the circumferential direction, the first driving part is a sphere, and the first driving part is movably arranged in the first spherical holes; when the first limiting disc rotates along the circumferential direction, the first driving part can move from one end of the first transition surface, which is smaller in axial thickness, to one end of the first transition surface, which is larger in axial thickness, so that the first driving part abuts against the stop block, and further the first limiting disc limits the rotating rod to rotate along the reverse direction, but does not limit the rotating rod to rotate along the forward direction.

In one embodiment, the driving member can drive the first limit disk and the second limit disk to rotate in opposite directions along the circumferential direction at the same time; when the first limiting disc and the second limiting disc rotate along the circumferential direction towards opposite directions, the first limiting disc can also axially approach and abut against the stop block, and the second limiting disc can axially approach and abut against the stop block.

In one embodiment, the first limiting disc comprises a plurality of first driving parts distributed along the circumferential direction, the main body further comprises a sleeve and a first limiting structure arranged between the sleeve and the first limiting disc, the first limiting structure comprises a plurality of first limiting parts distributed along the circumferential direction, the first limiting parts are provided with first transition surfaces, and the thickness of each first limiting part in the axial direction of the area where the first transition surface is located is gradually increased along the opposite direction; the first limiting plate is provided with a plurality of first spherical holes distributed along the circumferential direction, the first driving part is a sphere, and the first driving part is movably arranged in the first spherical holes; when the first limiting disc rotates along the circumferential direction, the first driving part can move from one end of the first transition surface with smaller axial thickness to one end of the first transition surface with larger axial thickness, so that the first driving part abuts against the stop block, and the first limiting disc is used for limiting the rotating rod to rotate along the reverse direction but not limiting the rotating rod to rotate along the forward direction;

the second limiting disc comprises a plurality of second driving parts which are distributed along the circumferential direction, the main body further comprises a second limiting structure which is arranged between the sleeve and the second limiting disc, and the second limiting structure comprises a plurality of second limiting parts which are distributed along the circumferential direction; the second limiting parts are provided with second transition surfaces, and the thickness of each second limiting part in the axial direction of the area where the second transition surface is located is gradually increased along the positive direction; the second limiting plate is provided with a plurality of second spherical holes distributed along the circumferential direction, the second driving part is a sphere, and the second driving part is movably arranged in the second spherical holes; when the second limiting disc rotates along the circumferential direction, the second driving part can move from one end of the second transition surface with smaller axial thickness to one end of the second transition surface with larger axial thickness, so that the second driving part abuts against the stop block, and the second limiting disc can limit the rotating rod to rotate along the forward direction but not limit the rotating rod to rotate along the reverse direction.

In one embodiment, the sleeve comprises a first shell and a second shell, the first shell and the second shell are spliced to form a containing cavity, the first limiting disc and the second limiting disc are limited in the containing cavity, the first limiting structure is located between the first shell and the first limiting disc, and the second limiting structure is located between the second shell and the second limiting disc.

In one embodiment, the driving piece comprises a key, a first movable block, a second movable block, a connecting rod and a reset piece, wherein the key is elastically arranged on one of the supporting arms, and the first movable block and the second movable block are both linked with the key; the first movable block and the second movable block are provided with driving surfaces, the driving surfaces are inclined surfaces or curved surfaces, the connecting rod is in transmission connection with the first limiting disc and the second limiting disc at the same time, and the connecting rod moves along the driving surfaces, so that the connecting rod can drive the first limiting disc and the second limiting disc to rotate; the reset piece is circumferentially arranged between the first limiting disc and the second limiting disc.

In one embodiment, the driving piece further comprises a first connecting block and a second connecting block, the first connecting block is linked with the first limiting disc, the second connecting block is linked with the second limiting disc, the connecting rod penetrates through the first connecting block and the second connecting block, two ends of the connecting rod can be lapped on two driving surfaces and can move along the two driving surfaces, the first limiting disc is driven to rotate with the second limiting disc, and the resetting piece is circumferentially arranged between the first connecting block and the second connecting block.

In one embodiment, the driving piece further comprises a first connecting column and a second connecting column, the first connecting column penetrates through the first connecting block and is connected with the first limiting disc, the second connecting column penetrates through the second connecting block and is connected with the second limiting disc, and the connecting rod is located between the first connecting column and the second connecting column.

In one embodiment, the stand further comprises a connection mount for connecting the stand to an external support structure, the connection mount being provided on one of the support arms.

According to the support provided by the utility model, the two adjacent support arms can relatively rotate, so that the angle of bearing equipment mounted on the support arms can be adjusted to an optimal state at any time according to the use requirement, meanwhile, the driving piece can drive the first limit disc and the second limit disc to move towards the direction close to each other, so that the first limit disc and the second limit disc clamp the stop block to limit the rotating rod to rotate along the circumferential direction, the support arms can be stably locked by limiting the relative rotation of the two adjacent support arms, the support arms can be stably suspended at a certain angle by the pretightening force, and when the support arms are required to be unlocked, the driving piece can drive the first limit disc and the second limit disc to move towards the direction far away from each other, so that the stop block is released by the first limit disc and the second limit disc.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a bracket in an embodiment;

FIG. 2 is a schematic view of the drive assembly of the bracket shown in FIG. 1;

fig. 3 is an exploded view of the drive assembly shown in fig. 2.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, "and/or" throughout this document includes three schemes, taking a and/or B as an example, including a technical scheme, a technical scheme B, and a technical scheme that both a and B satisfy; in addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

As shown in fig. 1, the present utility model provides a stand 10, where the stand 10 includes a support arm assembly 100 and a driving assembly 200, and the support arm assembly 100 includes a plurality of support arms 110 connected in sequence, where the support arms 110 are used to mount a carrying device, and the carrying device may be a photographic device or a photographic expansion fitting, and the photographic device may be a video camera or a video camera, and the photographic expansion fitting may be a photographic lamp, a microphone, a light supplement lamp, a flash lamp, and the like.

In an embodiment, the number of the supporting arms 110 may be two, it is understood that in other embodiments, the number of the supporting arms 110 may be more than three, and in particular, in this embodiment, the number of the supporting arms 110 is four, the four supporting arms 110 are sequentially connected end to end, the four supporting arms 110 are respectively a first supporting arm 111, a second supporting arm 112, a third supporting arm 113 and a fourth supporting arm 114, the length of the second supporting arm 112 is greater than the length of the first supporting arm 111, and the length of the third supporting arm 113 is greater than the length of the fourth supporting arm 114.

Adjacent support arms 110 are capable of relative rotation to switch the arm assembly 100 between different states. In particular, in the embodiment shown in fig. 1, when the arm assembly 100 is in the first state, the first support arm 111 and the second support arm 112 are disposed in parallel, and the first support arm 111 and the second support arm 112 extend in the same direction, the second support arm 112 forms an acute angle with the third support arm 113, and the third support arm 113 forms an obtuse angle with the fourth support arm 114. It will be appreciated that the angle formed between adjacent support arms 110 can be switched to a variety of different angles as desired by the user when the arm assembly 100 is switched to other states.

As shown in fig. 2 and 3, the driving assembly 200 is disposed at the joint of two adjacent support arms 110, the driving assembly 200 includes a main body 210, a rotating rod 220 and a driving member 230, and the main body 210 includes a first limiting disc 211 and a second limiting disc 212 arranged along the axial direction; the rotating rod 220 is rotatably penetrating the main body 210 along the circumferential direction, the rotating rod 220 comprises a rod body 221 and a stop block 222 sleeved outside the rod body 221, in this embodiment, the stop block 222 is disc-shaped, and it is understood that in other embodiments, the shape of the stop block 222 can be any shape.

The two ends of the rod body 221 are respectively connected with the two adjacent support arms 110, the stop block 222 is located between the first limit disc 211 and the second limit disc 212, the driving piece 230 is in transmission connection with at least one of the first limit disc 211 and the second limit disc 212, and the driving piece 230 can drive the first limit disc 211 and the second limit disc 212 to move towards a direction approaching or separating from each other, so that the first limit disc 211 and the second limit disc 212 clamp or release the stop block 222, and the rotation of the rotating rod 220 along the circumferential direction is limited or the limitation of the rotation of the rotating rod 220 along the circumferential direction is released, and the relative rotation of the two adjacent support arms 110 is limited or the limitation of the relative rotation of the two adjacent support arms 110 is released. It should be noted that, the "circumferential direction" as used herein refers to a rotation direction of one support arm 110 relative to the adjacent other support arm 110, and the "axial direction" as used herein refers to a direction perpendicular to the circumferential direction.

According to the support 10 provided by the utility model, the two adjacent support arms 110 can relatively rotate, so that the angle of bearing equipment mounted on the support arms 110 can be adjusted to an optimal state at any time according to the use requirement, meanwhile, the driving piece 230 can drive the first limiting disc 211 and the second limiting disc 212 to move towards the direction close to each other, so that the first limiting disc 211 and the second limiting disc 212 clamp the stop block 222 to limit the rotation of the rotating rod 220 along the circumferential direction, the stable locking of the support arms 110 is realized by limiting the relative rotation of the two adjacent support arms 110, the pretightening force of the support arms 110, which is fixedly suspended at a certain angle, is more stable, and when the unlocking is required, the driving piece 230 drives the first limiting disc 211 and the second limiting disc 212 to move towards the direction far away from each other, so that the stop block 222 is released by the first limiting disc 211 and the second limiting disc 212.

In an embodiment, the driving member 230 can drive the first limiting plate 211 to rotate circumferentially, and the first limiting plate 211 can axially approach and abut against the stop block 222 to limit the rotation of the rotating rod 220 in the circumferential direction while the first limiting plate 211 rotates in the circumferential direction.

In an embodiment, the driving member 230 can drive the first limiting plate 211 and the second limiting plate 212 to rotate in opposite directions along the circumferential direction at the same time; when the first limiting plate 211 and the second limiting plate 212 rotate in opposite directions along the circumferential direction, the first limiting plate 211 can also axially approach and abut against the stop block 222, and the second limiting plate 212 can axially approach and abut against the stop block 222.

Specifically, when the first limit disk 211 rotates in the forward direction, the second limit disk 212 rotates in the reverse direction, and when the first limit disk 211 rotates in the reverse direction, the second limit disk 212 rotates in the forward direction, and one of the "forward rotation" and the "reverse rotation" herein may be understood to be rotating in the clockwise direction, and the other may be understood to be rotating in the counterclockwise direction. When the first limit disk 211 and the second limit disk 212 rotate in opposite directions in the circumferential direction, the first limit disk 211 can also axially approach and abut against the stopper 222, and the second limit disk 212 can also axially approach and abut against the stopper 222. When the first and second limiting plates 211 and 212 abut against the stopper 222, the rotation of the rotating lever 220 is restricted.

As shown in fig. 3, further, the first limiting plate 211 includes a plurality of first driving parts 2112 arranged along a circumferential direction, the main body 210 further includes a sleeve 240 and a first limiting structure 250 disposed between the sleeve 240 and the first limiting plate 211, the first limiting structure 250 includes a plurality of first limiting parts 251 arranged along a circumferential direction, the first limiting parts 251 are provided with first transition surfaces, and a thickness of each first limiting part 251 in an axial direction of a region where the first transition surface is located is gradually increased along an opposite direction; the first limiting plate 211 is provided with a plurality of first spherical holes 2114 distributed along the circumferential direction, the first driving part 2112 is a sphere, and the first driving part 2112 is movably arranged in the first spherical holes 2114; when the first limiting plate 211 rotates circumferentially, the first driving portion 2112 can move from the end with the smaller axial thickness of the first transition surface to the end with the larger axial thickness of the first transition surface, so that the first driving portion 2112 abuts against the stop block 222, and the first limiting plate 211 further limits the rotation of the rotating rod 220 in the reverse direction but does not limit the rotation of the rotating rod 220 in the forward direction, that is, the rotating rod 220 can rotate in the forward direction or cannot rotate in the forward direction under the action of the first driving portion 2112.

Further, the second limiting disc 212 includes a plurality of second driving portions 2122 arranged along the circumferential direction, the main body 210 further includes a second limiting structure disposed between the sleeve 240 and the second limiting disc 212, and the second limiting structure includes a plurality of second limiting portions arranged along the circumferential direction; the second limiting parts are provided with second transition surfaces, and the thickness of each second limiting part in the axial direction of the area where the second transition surface is located is gradually increased along the forward direction; the second limiting disc 212 is provided with a plurality of second spherical holes 2124 distributed along the circumferential direction, the second driving part 2122 is a sphere, and the second driving part 2122 is movably arranged in the second spherical holes 2124; when the second limiting disc 212 rotates circumferentially, the second driving portion 2122 can move from the end with the smaller axial thickness of the second transition surface to the end with the larger axial thickness of the second transition surface, so that the second driving portion 2122 abuts against the stop block 222, and the second limiting disc 212 further limits the rotation of the rotating rod 220 in the forward direction but does not limit the rotation of the rotating rod 220 in the reverse direction, that is, the rotating rod 220 can rotate in the reverse direction or cannot rotate in the reverse direction under the action of the second driving portion 2122.

Based on the first driving portion 2112 being a sphere that is movably disposed, the second driving portion 2122 being a sphere that is movably disposed, when the first limiting plate 211 and the second limiting plate 212 are driven to rotate by the driving member 230, the first driving portion 2112 and the second driving portion 2122 roll to the positions with the highest thickness on the opposite transition surfaces respectively, at this time, the pressure of the stop block 222 pressing the first driving portion 2112 and the second driving portion 2122 will be greater and greater, and the first driving portion 2112 and the second driving portion 2122 will limit the rod 221 and the stop block 222 to rotate in the forward direction and rotate in the reverse direction respectively. When unlocking is needed, the driving piece 230 can drive the first limiting disc 211 and the second limiting disc 212 to rotate reversely, so that the first limiting disc 211 and the second limiting disc 212 respectively drive the first driving portion 2112 and the second driving portion 2122 to move to the positions with lower thicknesses of the corresponding transition surfaces, and the first driving portion 2112 and the second driving portion 2122 are not abutted against the opposite transition surfaces, so that rolling friction is reduced.

As shown in fig. 3, further, the main body 210 further includes a first snap ring 270 and a second snap ring 280, the first snap ring 270 is sleeved on the outer side of the rod 221, the first snap ring 270 is sandwiched between the first limiting disc 211 and the stop block 222, and the first snap ring 270 is used for limiting the first driving portion 2112 in the first spherical hole 2114, so as to prevent the first driving portion 2112 from falling out relative to the first spherical hole 2114; specifically, the first snap ring 270 includes a plurality of first clamping portions 272 arranged in the circumferential direction, and the plurality of first clamping portions 272 are respectively in one-to-one correspondence with the plurality of first driving portions 2112.

The second clamping ring 280 is sleeved on the outer side of the rod body 221, and the second clamping ring 280 is clamped between the second limiting disc 212 and the stop block 222, wherein the second clamping ring 280 is used for limiting the second driving part 2122 in the second spherical hole 2124 and preventing the second driving part 2122 from falling out of the second spherical hole 2124; specifically, the second snap ring 280 includes a plurality of second clamping portions 282 arranged in the circumferential direction, and the plurality of second clamping portions 282 are respectively in one-to-one correspondence with the plurality of second driving portions 2122.

As shown in fig. 2 and 3, further, the sleeve 240 includes a first shell 241 and a second shell 242, the first shell 241 and the second shell 242 are spliced to form a receiving cavity, the first limiting plate 211 and the second limiting plate 212 are limited in the receiving cavity, the first limiting structure 250 is located between the first shell 241 and the first limiting plate 211, the second limiting structure is located between the second shell 242 and the second limiting plate 212, and two ends of the rod 221 extend out of the first shell 241 and the second shell 242 respectively. The first limiting structure 250 may be directly formed on the first housing 241, or the first limiting structure 250 may be independent of the first housing 241, and the second limiting structure may be directly formed on the second housing 242, or the second limiting structure may be independent of the second housing 242. In particular, in the present embodiment, the first limiting structure 250 is directly formed on the first housing 241, and the second limiting structure is directly formed on the second housing 242.

As shown in fig. 1 and 3, the driving member 230 includes a key 231, a first movable block 232, a second movable block 233, a connecting rod 234 and a reset member 235, the key 231 is elastically disposed on one of the support arms 110, in this embodiment, the key 231 is elastically disposed on the fourth support arm 114, the first movable block 232 and the second movable block 233 are both linked with the key 231, specifically, the first movable block 232 is disposed on the first housing 241, the second movable block 233 is disposed on the second housing 242, the first movable block 232 and the second movable block 233 both have a driving surface 2322, the driving surface 2322 is an inclined surface or a curved surface, the connecting rod 234 is simultaneously in transmission connection with the first limiting disc 211 and the second limiting disc 212, and the connecting rod 234 moves along the driving surface 2322, so that the connecting rod 234 can drive the first limiting disc 211 and the second limiting disc 212 to rotate; the restoring member 235 may be a spring, and the restoring member 235 is circumferentially disposed between the first limiting plate 211 and the second limiting plate 212. Through setting up button 231 on the support arm 110 elasticity, the user only need carry out the one key operation of pressing button 231 downwards like this, can unlock the rotation restriction of two adjacent support arms 110, and is more convenient.

As shown in fig. 3, further, the driving member 230 further includes a first connecting block 236 and a second connecting block 237, the first connecting block 236 is linked with the first limiting disc 211, the second connecting block 237 is linked with the second limiting disc 212, specifically, the first connecting block 236 and the second connecting block 237 are located between the first movable block 232 and the second movable block 233, the first connecting rod 234 is arranged between the first connecting block 236 and the second connecting block 237 in a penetrating manner, two ends of the connecting rod 234 can be lapped on two driving surfaces 2322 and can move along the two driving surfaces 2322, and further the first limiting disc 211 and the second limiting disc 212 are driven to rotate, and the resetting member 235 is circumferentially arranged between the first connecting block 236 and the second connecting block 237.

Further, the driving member 230 further includes a first connecting post 238 and a second connecting post 239, the first connecting post 238 is disposed through the first connecting block 236 and connected with the first limiting plate 211 to realize the linkage between the first connecting block 236 and the first limiting plate 211, and the second connecting post 239 is disposed through the second connecting block 237 and connected with the second limiting plate 212 to realize the linkage between the second connecting block 237 and the second limiting plate 212, and the connecting rod 234 is disposed between the first connecting post 238 and the second connecting post 239. Specifically, the first connecting post 238 is integrally formed with the first limiting plate 211, and the second connecting post 239 is integrally formed with the second limiting plate 212.

As shown in fig. 1, further, the stand 10 further includes a connection base 300 for connecting the stand 10 to an external support structure, the connection base 300 being provided on one of the support arms 110. Specifically, the connection base 300 is disposed at one end of the first support arm 111, the connection base 300 may be a quick-mounting base, a magnetic attraction base, a clip, a threaded connection member, a threaded hole, or the like, and the external support structure may be a table, or other support structures.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims

1. A stent, comprising:

2. The bracket of claim 1, wherein the drive member is configured to drive the first limit disk to rotate in a circumferential direction, and wherein the first limit disk is further configured to axially abut and bear against the stop block to limit the rotation of the rotating lever in the circumferential direction while the first limit disk rotates in the circumferential direction.

3. The bracket according to claim 2, wherein the first limiting plate comprises a plurality of first driving parts distributed along the circumferential direction, the main body further comprises a sleeve and a first limiting structure arranged between the sleeve and the first limiting plate, the first limiting structure comprises a plurality of first limiting parts distributed along the circumferential direction, the first limiting parts are provided with first transition surfaces, and the thickness of each first limiting part in the axial direction of the area where the first transition surface is located is gradually increased along the reverse direction; the first limiting plate is provided with a plurality of first spherical holes distributed along the circumferential direction, the first driving part is a sphere, and the first driving part is movably arranged in the first spherical holes; when the first limiting disc rotates along the circumferential direction, the first driving part can move from one end of the first transition surface, which is smaller in axial thickness, to one end of the first transition surface, which is larger in axial thickness, so that the first driving part abuts against the stop block, and further the first limiting disc limits the rotating rod to rotate along the reverse direction, but does not limit the rotating rod to rotate along the forward direction.

4. The bracket of claim 1, wherein the drive member is capable of simultaneously driving the first and second limit disks to rotate in opposite directions in a circumferential direction; when the first limiting disc and the second limiting disc rotate along the circumferential direction towards opposite directions, the first limiting disc can also axially approach and abut against the stop block, and the second limiting disc can axially approach and abut against the stop block.

5. The bracket according to claim 4, wherein the first limiting plate comprises a plurality of first driving parts distributed along the circumferential direction, the main body further comprises a sleeve and a first limiting structure arranged between the sleeve and the first limiting plate, the first limiting structure comprises a plurality of first limiting parts distributed along the circumferential direction, the first limiting parts are provided with first transition surfaces, and the thickness of each first limiting part in the axial direction of the area where the first transition surface is located is gradually increased along the reverse direction; the first limiting plate is provided with a plurality of first spherical holes distributed along the circumferential direction, the first driving part is a sphere, and the first driving part is movably arranged in the first spherical holes; when the first limiting disc rotates along the circumferential direction, the first driving part can move from one end of the first transition surface with smaller axial thickness to one end of the first transition surface with larger axial thickness, so that the first driving part abuts against the stop block, and the first limiting disc is used for limiting the rotating rod to rotate along the reverse direction but not limiting the rotating rod to rotate along the forward direction;

6. The bracket of claim 5, wherein the sleeve comprises a first housing and a second housing, the first housing and the second housing are spliced to form a receiving cavity, the first spacing disc and the second spacing disc are positioned in the receiving cavity, the first spacing structure is positioned between the first housing and the first spacing disc, and the second spacing structure is positioned between the second housing and the second spacing disc.

7. The bracket of claim 4, wherein the driving member comprises a key, a first movable block, a second movable block, a connecting rod and a reset member, the key is elastically arranged on one of the supporting arms, and the first movable block and the second movable block are both linked with the key; the first movable block and the second movable block are provided with driving surfaces, the driving surfaces are inclined surfaces or curved surfaces, the connecting rod is in transmission connection with the first limiting disc and the second limiting disc at the same time, and the connecting rod moves along the driving surfaces, so that the connecting rod can drive the first limiting disc and the second limiting disc to rotate; the reset piece is circumferentially arranged between the first limiting disc and the second limiting disc.

8. The bracket of claim 7, wherein the driving member further comprises a first connecting block and a second connecting block, the first connecting block is linked with the first limiting disc, the second connecting block is linked with the second limiting disc, the connecting rod is arranged on the first connecting block and the second connecting block in a penetrating manner, two ends of the connecting rod can be lapped on two driving surfaces and can move along the two driving surfaces, the first limiting disc and the second limiting disc are driven to rotate, and the resetting member is arranged between the first connecting block and the second connecting block along the circumferential direction.

9. The bracket of claim 8, wherein the driving member further comprises a first connecting post and a second connecting post, the first connecting post is arranged through the first connecting block and connected with the first limiting plate, the second connecting post is arranged through the second connecting block and connected with the second limiting plate, and the connecting rod is arranged between the first connecting post and the second connecting post.

10. The stand of claim 1 further comprising a connector for connecting the stand to an external support structure, the connector being disposed on one of the support arms.