WO2023109690A1

WO2023109690A1 - Display bracket

Info

Publication number: WO2023109690A1
Application number: PCT/CN2022/138058
Authority: WO
Inventors: 尤小东; 王宏军
Original assignee: 尤小东
Priority date: 2021-12-14
Filing date: 2022-12-09
Publication date: 2023-06-22
Also published as: CN114135767A

Abstract

A display bracket, comprising a base (100), a connector (200), a first connecting arm (300), a second connecting arm (400), and an elastic assembly (500), wherein the base is provided with a first hinge point (110) and a second hinge point (120); the connector is provided with a third hinge point (210) and a fourth hinge point (220); a first end of the first connecting arm is hinged to the first hinge point, and a second end of the first connecting arm is hinged to the third hinge point; a first end of the second connecting arm is hinged to the second hinge point, and a second end of the second connecting arm is hinged to the fourth hinge point; the first hinge point, the second hinge point, the third hinge point, the fourth hinge point, the first connecting arm and the second connecting arm together form a quadrangular structure; and the elastic assembly comprises an elastic member (510) for providing an elastic force, and when the connector moves from a high point to a low point or moves from a low point to a high point, an included angle between the elastic member and the first connecting arm remains constant.

Description

A monitor stand

This application claims the priority of the Chinese patent application with the application number 202111524751.X and the title of the invention "a display stand" submitted to the China Patent Office on December 14, 2021, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to a display stand.

Background technique

The height-adjustable display stand in the related art mostly adopts a quadrilateral structure plus a fixed support point, and the support point often uses elastic elements such as fixed springs or gas springs to provide a certain elastic force to make the support overcome the gravity of the display and keep the support hovering state.

Fig. 1 is a structural schematic diagram of an existing display stand, as shown in Fig. 1, the ends of the upper connecting arm 2 and the lower connecting arm 3 of the display stand are respectively hinged with the base 1 and the connecting head 4, thereby constructing In addition, one end of the elastic balance mechanism (including the adjusting rod 8 and the elastic member 7) is hinged to the upper connecting arm, and the other end is hinged to the connecting head. After adjusting the display and the elastic balance mechanism to reach a balance, the display can rotate up and down freely and stop freely. During the process of the display rotating up and down, the elastic member will be continuously stretched, and the elastic force will increase. The clamp of the elastic force balance mechanism and the upper connecting arm The angle will decrease, changing from 6° to 5°, and then changing to 3°, so that the torque will not change, so that during the up and down rotation, the torque provided by the elastic member 7 will be the same at any position, so that any position Free to stop.

In the process of adjusting the height and angle of the monitor above, the angle between the elastic balance mechanism and the upper connecting arm will change. Therefore, a certain space needs to be reserved in the design of the monitor bracket so that To adapt to the angle change between the elastic balance mechanism and the upper connecting arm, thus making the display stand relatively large in size. How to reduce the volume of this type of display stand by rationalizing the design is an urgent problem to be solved.

Contents of the invention

The purpose of the embodiments of the present application is to provide a display stand, which is beneficial to reduce the volume of the display stand. The specific technical scheme is as follows:

The embodiment of the present application proposes a monitor bracket, including: a base, a connecting head, a first connecting arm, a second connecting arm and an elastic assembly, the base is provided with a first hinge point and a second hinge point; When installing the display, the connecting head is provided with a third hinge point and a fourth hinge point; the first end of the first connecting arm is hinged on the first hinge point, and the second end of the first connecting arm is hinged on the The third hinge point; the first end of the second connecting arm is hinged at the second hinge point, and the second end of the second connecting arm is hinged at the fourth hinge point; the first hinge Point, the second hinge point, the third hinge point and the fourth hinge point form a quadrilateral structure with the first connecting arm and the second connecting arm; the elastic component is configured to balance the gravity of the display, and the elastic The assembly includes an elastic member for providing elastic force, and when the connecting head moves from a high point to a low point or from a low point to a high point, the angle between the elastic member and the first connecting arm stable.

According to the display stand in the embodiment of the present application, a quadrilateral structure is adopted, and the height of the display support can be changed by changing the position of each side of the quadrilateral structure, and at the same time, the elastic member is used to balance the gravity of the display, so that the display can hover at any height . In addition, the elastic component includes an elastic member for providing elastic force, and when the connecting head moves from a high point to a low point or from a low point to a high point, the angle between the elastic member and the first connecting arm is fixed In other words, during the process of adjusting the height of the display stand, the angle between the elastic member and the first connecting arm remains constant. Since the angle between the elastic member and the first connecting arm remains constant, the monitor support does not need to reserve a space for the elastic member to change its angle during design, which is beneficial to reduce the overall volume of the display support, and further It is beneficial to meet the lightweight design requirements of the display stand.

In some embodiments of the present application, the elastic member includes a spring, and when the connecting head moves from a high point to a low point or from a low point to a high point, the axis of the spring is connected to the first connection. The included angle between the arms is fixed; the elastic assembly also includes a linkage rod, the linkage rod includes a rod body and a movable part arranged on the rod body, and the first end of the rod body is hinged to the base , the movable part is arranged at the second end of the rod body, the movable part is movably connected to the first connecting arm, and the end of the spring is connected to the movable part.

In some embodiments of the present application, the first end of the rod body of the linkage rod is hinged to the second hinge point.

In some embodiments of the present application, the movable part and the rod body are in an integral structure or in a separate structure.

In some embodiments of the present application, the movable part is a sliding shaft, a roller or a roller arranged at the second end of the rod.

In some embodiments of the present application, a guide part is provided on the first connecting arm, and at least a part of the movable part is limited to the guide part.

In some embodiments of the present application, the movable part is connected to an end of the spring close to the connecting head, or the movable part is connected to an end of the spring close to the base.

In some embodiments of the present application, the elastic member includes a spring, and when the connecting head moves from a high point to a low point or from a low point to a high point, the axis of the spring is connected to the first connection. The angle between the arms is fixed; the elastic assembly also includes a flexible traction piece and a guide piece, one end of the flexible traction piece is installed on the end of the spring close to the connector, and the flexible traction piece The other end is connected to the connecting head, the guide member is arranged on the first connecting arm or the second connecting arm, and the guide member is configured to guide the flexible traction member during the movement of the flexible traction member .

In some embodiments of the present application, the flexible traction member is a traction rope.

In some embodiments of the present application, the guide member is a pulley, and the flexible traction member is tensioned on the pulley; or, the guide member is a pipe structure, and the flexible traction member passes through the pipe structure. Or, the guide member is a groove structure, and the flexible traction member passes through the groove structure.

In some embodiments of the present application, the elastic member further includes a screw rod, a first threaded sleeve and a rotating shaft, the first threaded sleeve is fixedly connected to the spring, and the screw rod and the first threaded sleeve are threadedly engaged , the rotating shaft is sleeved on the screw rod, and the screw rod is rotatably mounted on the first hinge point through the rotating shaft.

In some embodiments of the present application, the first connecting arm includes a first shell and a second shell, and the first shell and the second shell are buckled together in an opposing manner to define a receiving cavity ; The second connecting arm and the elastic component are arranged in the accommodating cavity.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can obtain other embodiments according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of an existing display stand;

Fig. 2 is a cross-sectional view of a display bracket of some embodiments of the present application;

Figure 3 is an exploded view of a display stand in some embodiments of the present application;

Fig. 4 is a cross-sectional view of a display bracket in some other embodiments of the present application;

Fig. 5 is an exploded view of a display stand according to some other embodiments of the present application.

The marks in the accompanying drawings are as follows:

Base 100, first hinge point 110, second hinge point 120;

Connecting head 200, third hinge point 210, fourth hinge point 220;

The first connecting arm 300, the guide part 310, the pulley 320, the first shell 330, and the second shell 340;

the second connecting arm 400;

Elastic component 500, elastic member 510, screw rod 520, rotating shaft 521, first threaded sleeve 530, spring 540, linkage rod 550, movable part 560, flexible traction member 570, second threaded sleeve 580;

Panel assembly 600.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art based on this application belong to the scope of protection of this application.

Referring to FIG. 2 , an embodiment of the present application proposes a display stand, which includes a base 100 , a connecting head 200 , a first connecting arm 300 , a second connecting arm 400 and an elastic component 500 . Specifically, the base 100 is provided with a first hinge point 110 and a second hinge point 120, the connector 200 is used to install the display, the connector 200 is provided with a third hinge point 210 and a fourth hinge point 220, the first connection The first end of the arm 300 is hinged at the first hinge point 110, the second end of the first connecting arm 300 is hinged at the third hinge point 210, the first end of the second connecting arm 400 is hinged at the second hinge point 120, The second end of the second connecting arm 400 is hinged to the fourth hinge point 220 . The elastic assembly 500 is configured to balance the gravity of the display, and the elastic assembly 500 includes an elastic member 510 for providing elastic force. When the connecting head 200 moves from a high point to a low point or from a low point to a high point, the angle between the elastic member 510 and the first connecting arm 300 remains constant.

Specifically, the first hinge point 110, the second hinge point 120, the third hinge point 210, and the fourth hinge point 220 can be used as four points of a quadrilateral structure, and correspondingly, the base 100, the connecting head 200, the first connecting arm 300 and the second connecting arm 400 can be used as the four sides of the quadrilateral structure, thereby forming a quadrilateral structure. Based on the quadrilateral structure of the display stand, the height of the display stand can be adjusted. During the height adjustment process, the elastic component 500 is used to balance the gravity of the display so that the display can hover at any height.

According to the display stand in the embodiment of the present application, a quadrilateral structure is adopted, and the height of the display support can be changed by changing the position of each side of the quadrilateral structure, and at the same time, the elastic member is used to balance the gravity of the display, so that the display can hover at any height . In addition, the elastic assembly 500 includes an elastic member 510 for providing elastic force, and when the connecting head 200 moves from a high point to a low point or from a low point to a high point, the connection between the elastic member 510 and the first connecting arm 300 The included angle between the elastic member 510 and the first connecting arm 300 is always kept constant during the process of adjusting the height of the display stand. Since the angle between the elastic member 510 and the first connecting arm 300 remains constant, the monitor support does not need to leave a space for the elastic member 510 to realize the angle change when designing the display support, so it is beneficial to reduce the overall size of the display support. The volume is beneficial to meet the lightweight design requirements of the monitor stand.

2 and 3, in some embodiments, the elastic member 510 includes a spring 540, the axis of the spring 540 is in line with the first The included angle between the connecting arms 300 is constant. The elastic assembly 500 also includes a linkage rod 550. The linkage rod 550 includes a rod body and a movable part 560 arranged on the rod body. One end of the rod body is hinged to the base 100, and the movable part 560 is arranged on the second end of the rod body. The movable part 560 Connected to the first connecting arm 300 in a movable manner, the end of the spring 540 is connected to the movable part 560 .

Wherein, the angle between the elastic member 510 and the first connecting arm 300 specifically refers to the angle between the axis of the spring 540 and the length direction of the first connecting arm 300 .

When the height of the display is adjusted, the connecting head 200 is raised or lowered relative to the base 100, so that the positions of the third hinge point 210 and the fourth hinge point 220 relative to the first hinge point 110 and the second hinge point 120 changes, thus, the first connecting arm 300 is rotated around the first hinge point 110, and the second connecting arm 400 is rotated around the second hinge point 120. During this process, the length of the linkage rod 550 will not change, so , being limited by the linkage rod 550, the movable part 560 will move relative to the first connecting arm 300, so that the length of the spring 540 changes, so that the elastic force generated by the spring 540 can be balanced with the gravity of the display, This in turn enables the display to hover freely at various height positions.

Further, the first end of the rod body of the linkage rod 550 is hinged to the second hinge point 120 . Thus, the second connecting arm 400 and the rod body are jointly connected to the second hinge point 120 on the base 100, thereby improving the utilization rate of the hinge point, that is, there is no need to separately set an additional hinge point for the linkage rod 550, which is beneficial to Save processing cost.

In some embodiments, the movable part 560 and the rod body may be an integrated structure, that is, the movable part 560 is processed synchronously after the rod body 560 is formed, and the two are integrated. In some other embodiments, the movable part 560 and the rod body may also be of a split structure, that is, the two are independent parts after being processed and formed, and are connected together by assembly.

Further, the movable part 560 may be a sliding shaft, a roller, or a roller, etc., arranged at the second end of the rod body. When the movable part 560 is a sliding shaft, the movable part 560 moves in a manner of sliding relative to the first connecting arm 300 . When the movable part 560 is a roller or a roller, the movable part 560 moves in a manner of rolling relative to the first connecting arm 300 , at this time, it is beneficial to reduce the friction when the movable part 560 slides relative to the first connecting arm 300 Force, so that the movable part 560 moves more smoothly.

In some embodiments, the first connecting arm 300 is provided with a guide part 310, at least a part of the structure of the movable part 560 is limited by the guide part 310, and the direction of movement of the movable part 560 can be restricted by the guide part 310, that is, That is to say, the movable part 560 needs to slide along the guide part 310, so that it is more beneficial to ensure that the spring 540 is in a fixed angle state relative to the first connecting arm 300, so as to prevent the spring 540 from angular deviation during the stretching process.

It can be understood that, in the above-mentioned embodiment, the elastic force provided by the spring 540 can be a tensile force or a compressive force. Specifically, an adaptive design can be carried out according to the different acting positions of the elastic force pair, which is not discussed in the present application. Do limit.

Further, the movable part 560 may be connected to one end of the spring 540 close to the connection head 200 , and in some other embodiments, the movable part 560 may also be connected to one end of the spring 540 close to the base 100 . Specifically, when the elastic force provided by the spring 540 is tension, the movable part 560 can be arranged at one end of the spring 540 close to the connector 200; and when the elastic force provided by the spring 540 is compression, The movable part 560 may be disposed at one end of the spring 540 close to the base 100 . In both cases, the elastic force of the spring 540 can be stretched and stretched to a state in balance with the gravity of the display.

Please refer to FIG. 4 and FIG. 5. In other embodiments, the elastic member 510 includes a spring 540. When the connecting head 200 moves from a high point to a low point or from a low point to a high point, the axis of the spring 540 is in line with the first The included angle between the connecting arms 300 is constant. The elastic assembly 500 also includes a flexible traction member 570 and a guide member. One end of the flexible traction member 570 is installed on the end of the spring 540 close to the connector 200, the other end of the flexible traction member 570 is connected to the connector 200, and the guide member is arranged on the first connection. On the arm 300 or the second connecting arm 400 , the guide is configured to guide the flexible traction member 570 during the movement of the flexible traction member 570 .

When the height of the display is adjusted, the connecting head 200 is raised or lowered relative to the base 100, so that the positions of the third hinge point 210 and the fourth hinge point 220 relative to the first hinge point 110 and the second hinge point 120 changes, thereby making the first connecting arm 300 rotate around the first hinge point 110, and the second connecting arm 400 rotate around the second hinge point 120. During this process, the stressed state of the spring 540 changes. The length of the traction member 570 changes when pulled, so that when the display is at a new height, the elastic force generated by the spring 540 can rebalance with the gravity of the display. Based on the above principles, it is possible to enable the display to hover freely at various height positions. In addition, a guide is provided on the first connecting arm 300 or the second connecting arm 400. When the length of the spring 540 changes and the flexible traction member 570 moves, under the guidance of the guide, the flexible traction member 570 can be guaranteed to The direction of the traction force applied to the spring 540 is collinear with the axial direction of the spring 540 , so that it is beneficial to ensure that the angle between the elastic member 510 and the first connecting arm 300 remains unchanged.

Further, the flexible traction member 570 may be a traction rope, a traction belt and the like.

In some embodiments, the guide member is a pulley 320 , and the flexible traction member 570 is tensioned on the pulley 320 . Using the pulley 320 as a guide, on the one hand, it can play a role in guiding the movement of the flexible traction member 570; Friction is generated between them, thereby helping to prevent the flexible traction member 570 from rubbing.

In some other embodiments, the guide member is a pipe structure, and the flexible traction member 570 passes through the pipe structure. Specifically, there is a gap between the flexible traction member 570 and the pipe wall of the pipe structure, so that the flexible traction member 570 can move relative to the pipe structure. Wherein, the axis of the pipe structure has a collinear relationship with the spring 540 , thus, it is beneficial to ensure that the included angle between the elastic member 510 and the first connecting arm 300 remains unchanged.

In some other embodiments, the guide member is a groove structure, and the flexible traction member 570 passes through the groove structure. Specifically, there is a gap between the flexible pulling member 570 and the inner wall of the groove structure, so that the flexible pulling member 570 can move relative to the groove structure. Wherein, the center of the groove structure may be located on the extension line of the axis of the spring 540 , thus, it is beneficial to ensure that the included angle between the elastic member 510 and the first connecting arm 300 remains unchanged.

In some embodiments, the elastic member 510 further includes a screw rod 520 and a first threaded sleeve 530 , the first threaded sleeve 530 is fixedly connected with the spring 540 , and the screw rod 520 is threadedly engaged with the first threaded sleeve 530 . By turning the screw rod 520, the relative position of the first threaded sleeve 530 and the screw rod 520 can be adjusted, thereby changing the position of the end of the spring 540, adjusting the initial length of the spring 540, and then changing the bearing capacity of the spring 540. , it is convenient to adjust the load-bearing capacity of the spring 540, so that the elastic force provided by the spring 540 can reach a force balance state with displays of different weights.

Further, the screw rod 520 can be hinged to the first hinge point 110 . In the process of adjusting the height of the display, the first connecting arm 300 will rotate around the first hinge point 110, therefore, the screw rod 520 is hinged with the first hinge point 110, which is beneficial to make the screw rod 520 and the first connecting arm 300 rotates synchronously, which helps to keep the angle between the screw rod 520 and the first connecting arm 300 constant, and further helps to keep the angle between the spring 540 and the first connecting arm 300 constant.

Specifically, a rotating shaft 521 can be sheathed on the screw 520 , and the rotating shaft 521 is perpendicular to the screw 520 , and the screw 520 is further rotated and mounted on the first hinge point 110 through the rotating shaft 521 .

Further, the screw rod 520 is mounted on the first connecting arm 300 in a manner that can rotate around its own axis, so as to adjust the relative position of the first threaded sleeve 530 and the screw rod 520 by rotating the screw rod around its own axis.

Please refer to FIG. 4 , in some embodiments, based on the fact that the elastic assembly 500 further includes a flexible traction member 570 and a guide member, the elastic assembly 500 may further include a second threaded sleeve 580 installed on the far side of the spring 540 One end of the screw rod 520 and one end of the flexible traction member 570 are connected to the second threaded sleeve 580 . In this embodiment, the second threaded sleeve 580 is used as the connecting piece between the spring 540 and the flexible traction member 570, so that it is more beneficial to ensure that the connecting portion of the flexible traction member 570 and the spring 540 is at the center of the spring 540, thereby ensuring Spring 540 is less prone to deflection when stretched or compressed.

2 and 4, in some embodiments, the first connecting arm 300 includes a first shell 330 and a second shell 340, and the first shell 330 and the second shell 340 are snapped together in an opposite manner to An accommodating cavity is defined; the second connecting arm 400 and the elastic component 500 are disposed in the accommodating cavity. In this embodiment, the first connecting arm 300 is presented in the form of a housing, thus providing a space for the elastic component 500 to be installed, and the second connecting arm 400 can also be arranged in the receiving cavity, thereby enabling the user to The elastic component 500 and the second connecting arm 400 cannot be seen, so that the appearance of the display stand is more tidy and aesthetic. In addition, the first connecting arm 300 serves as a shell structure covering the elastic component 500 and the second connecting arm 400, which can also protect the elastic component 500, which can prevent the elastic component 500 from being bumped, and is also beneficial to prevent the elastic component 500 from being hit. Dust and waterproof.

Further, the first shell 330 and the second shell 340 may be connected through a connecting piece or a clamping structure, which is not specifically limited in this embodiment.

Referring to FIGS. 2-5 , in some embodiments, a panel assembly 600 is installed on the connector 200 , and the panel assembly 600 is used for installing a display. The panel assembly 600 can be installed on the connector 200 by means of bolts, clamping, etc., which is not limited in this embodiment.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment of the present application is described in a related manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application are included within the protection scope of this application.

Claims

A display stand, characterized in that it comprises:

a base, the base is provided with a first hinge point and a second hinge point;

a connecting head, the connecting head is used for installing the display, and the connecting head is provided with a third hinge point and a fourth hinge point;

a first connecting arm, the first end of the first connecting arm is hinged to the first hinge point, and the second end of the first connecting arm is hinged to the third hinge point;

The second connecting arm, the first end of the second connecting arm is hinged to the second hinge point, the second end of the second connecting arm is hinged to the fourth hinge point, the first hinge point, The second hinge point, the third hinge point and the fourth hinge point form a quadrilateral structure with the first connecting arm and the second connecting arm;

an elastic assembly configured to balance the gravity of the display, the elastic assembly includes an elastic member for providing elastic force, during the movement of the connecting head from a high point to a low point or from a low point to a high point , the angle between the elastic member and the first connecting arm is constant.
The display stand according to claim 1, wherein the elastic member comprises a spring, and when the connecting head moves from a high point to a low point or from a low point to a high point, the axis of the spring is in line with the The included angle between the first connecting arms is fixed;

The elastic assembly also includes a linkage rod, the linkage rod includes a rod body and a movable part arranged on the rod body, the first end of the rod body is hinged to the base, and the movable part is arranged on the At the second end of the rod body, the movable part is movably connected to the first connecting arm, and the end of the spring is connected to the movable part.
The display stand according to claim 2, wherein the first end of the rod body of the linkage rod is hinged to the second hinge point.
The display stand according to claim 2, wherein the movable part and the rod body are in an integral structure or in a separate structure.
The display stand according to claim 2, wherein the movable part is a sliding shaft, a roller or a roller provided at the second end of the rod.
The display stand according to claim 2, wherein a guide part is provided on the first connecting arm, and at least a part of the movable part is limited to the guide part.
The display stand according to claim 2, wherein the movable part is connected to an end of the spring close to the connecting head, or the movable part is connected to an end of the spring close to the base one end.
The display stand according to claim 1, wherein the elastic member comprises a spring, and when the connecting head moves from a high point to a low point or from a low point to a high point, the axis of the spring is in line with the The included angle between the first connecting arms is fixed;

The elastic assembly also includes a flexible traction piece and a guide piece, one end of the flexible traction piece is installed on an end of the spring close to the connector, the other end of the flexible traction piece is connected to the connector, the A guiding element is arranged on the first connecting arm or the second connecting arm, and the guiding element is configured to guide the flexible pulling element during the movement of the flexible pulling element.
The display stand according to claim 8, wherein the flexible traction member is a traction rope.
The display stand according to claim 8, wherein the guide member is a pulley, and the flexible traction member is tensioned on the pulley;

Alternatively, the guide member is a pipe structure, and the flexible traction member passes through the pipe structure;

Alternatively, the guide member is a groove structure, and the flexible traction member passes through the groove structure.
The display stand according to any one of claims 2 to 10, wherein the elastic member further comprises a screw, a first threaded sleeve and a rotating shaft, the first threaded sleeve is fixedly connected to the spring, and the The screw rod and the first threaded sleeve are threadedly engaged, the rotating shaft is sleeved on the screw rod, and the screw rod is rotatably mounted on the first hinge point through the rotating shaft.
The display stand according to any one of claims 1 to 10, wherein the first connecting arm comprises a first shell and a second shell, and the first shell and the second shell are opposite to each other. fastened together in a manner to define an accommodating cavity;

The second connecting arm and the elastic component are arranged in the accommodating cavity.