Microswitch structure
By designing swingable conductive connectors and contacts of multi-contact structures in micro switches, combined with the transmission elements of support plates and elastic parts, the problems of poor contact and unstable waveform caused by traditional micro switch contact structures are solved. , improves the reliability and control efficiency of the switch.
Patent Information
- Application Number
- CN202420112406.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-16
AI Technical Summary
The contact structure of traditional micro switches is usually bumpy or flat, which leads to problems such as poor contact and unstable waveform during use.
A micro switch structure is designed, wherein the conductive connection member is swingable, the first conductive contact can swing between the second conductive contact and the third conductive contact, the second conductive contact and the third conductive contact are The multi-contact structure ensures that even if a contact is poor, it can be turned on, and switch control is achieved through the transmission element composed of the support plate and the elastic member.
It improves the reliability of the micro switch, avoids poor contact and unstable waveforms, and realizes rapid switching operations and stable control of signals or circuits.
Smart Images
Figure CN222260841U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switches, in particular to a micro switch structure. Background Art
[0002] As a control element, micro switches often need to cooperate with other elements to connect or disconnect signals or circuits. The existing micro switch structure is generally a mechanical contact type, that is, it provides at least one pair of moving contacts and static contacts that are coordinated by springs. The external mechanical force acts on the actuating element through a transmission element (pin, button, lever, roller, etc.). The actuating element is generally implemented by a spring. When the spring is subjected to a critical point, it produces an instantaneous elastic deformation action, so that the moving contact at the end of the spring quickly connects or disconnects with the static contact. When the force on the transmission element is removed, the spring produces a reverse instantaneous elastic recovery under the action of its own elastic force, and the moving contact at the end of the spring instantly completes the reverse action. This makes the existing micro switch have the characteristics of small contact spacing, short action stroke, small pressing force, rapid connection and disconnection, and the spring only provides instantaneous elastic force in the direction of the small action stroke of the moving contact. Therefore, the reliability of the contact structure is very important for the micro switch. However, the contact structure of a traditional micro switch is usually a convex point or a flat surface, which makes it easy for the micro switch to have problems such as poor contact and unstable waveform during use. Utility Model Content
[0003] The utility model provides a micro switch structure to solve the problem that the contact structure of a traditional micro switch is usually a convex point or a flat surface, which makes it easy to cause poor contact and unstable waveform during the use of the micro switch.
[0004] A micro switch structure provided by the present application includes: a base, a first terminal, a second terminal and a third terminal, wherein the first terminal, the second terminal and the third terminal respectively penetrate the base along the thickness direction of the base; a conductive connecting member, one end of the conductive connecting member is conductively connected to the first terminal, and the other end of the conductive connecting member is provided with a first conductive contact; the second terminal is provided with a second conductive contact, and the third terminal is provided with a third conductive contact, and the second conductive contact and the third conductive contact are both multi-contact structures; the conductive connecting member is swingably arranged so that the first conductive contact can swing between the second conductive contact and the third conductive contact to contact the second conductive contact or the third conductive contact.
[0005] According to the above technical features, the utility model realizes the switching control of signals or circuits through a simple micro switch structure. Specifically, the first terminal is a common terminal, the second terminal and the third terminal are respectively a normally open terminal and a normally closed terminal. Due to the swingable setting of the conductive connecting piece, when the first conductive contact on the conductive connecting piece is close to the second conductive contact of the second terminal under the action of external force and conflicts with the second conductive contact, the normally open terminal is turned on, completing the micro switch opening action; when the first conductive contact on the conductive connecting piece is close to the third terminal under the action of external force and conflicts with the third conductive contact, the normally closed terminal is turned on, completing the micro switch closing action.
[0006] In the utility model, the second conductive contact and the third conductive contact are both multi-contact structures, so that when the third conductive contact abuts against the second conductive contact or the third conductive contact, even if one of the contacts is poorly contacted, conduction can still be achieved, thereby improving the reliability of the micro switch structure.
[0007] Furthermore, the second conductive contact includes a first second conductive sub-contact and a second conductive sub-contact. When the first conductive contact contacts the second conductive contact, it can contact the first second conductive sub-contact and / or the second conductive sub-contact.
[0008] According to the above technical features, the second conductive contact in the utility model is a multi-contact structure, specifically, including a second sub-conductive contact 1 and a second sub-conductive contact 2. The second sub-conductive contact 1 and the second sub-conductive contact 2 can both abut and conduct with the first conductive contact, thereby improving the reliability of the micro switch, thereby avoiding problems such as poor contact and unstable waveform of the micro switch during use.
[0009] Further, the third conductive contact includes a third sub-conductive contact 1 and a third sub-conductive contact 2, and when the first conductive contact contacts the third conductive contact, it can contact the third sub-conductive contact 1 and / or the third sub-conductive contact 2.
[0010] According to the above technical features, the third conductive contact in the utility model is a multi-contact structure, specifically, including a third sub-conductive contact 1 and a third sub-conductive contact 2. The third sub-conductive contact 1 and the third sub-conductive contact 2 can both abut and conduct with the first conductive contact, thereby improving the reliability of the micro switch, thereby avoiding problems such as poor contact and unstable waveform of the micro switch during use.
[0011] Furthermore, it also includes a support plate and an elastic member, one end of the support plate is supported on the base, the other end of the support plate is swingably arranged, and the other end of the support plate is connected to the conductive connecting member through the elastic member.
[0012] According to the above technical features, the support plate and the elastic part constitute a transmission element. When an external force acts on the other end of the support plate or the elastic part on the other end, the support plate swings and the elastic part deforms. The elastic part pulls the conductive connecting part to change the original position of the first conductive contact on the conductive connecting part, thereby realizing the switching control of the micro switch.
[0013] Furthermore, the elastic member is a spring, one end of the spring is connected to the other end of the support plate, and the other end of the spring is connected to the other end of the conductive connecting member.
[0014] According to the above technical features, the spring has the characteristics of elastic deformation after being loaded and returning to its original state after being unloaded, so that when the elastic part is compressed by external force, it can pull the conductive connecting part to make the switch turned on or off; when the external force disappears, the elastic part rebounds, prompting the conductive connecting part to automatically reset, and then the switch is turned off or on.
[0015] Furthermore, the second conductive contact and the third conductive contact are arranged at intervals along the thickness direction of the base, and the first conductive contact is located between the second conductive contact and the third conductive contact.
[0016] According to the above technical features, since the first conductive contact is located between the second conductive contact and the third conductive contact, the first conductive contact only needs to move a short stroke to contact the second conductive contact and the third conductive contact, so that the switch operates quickly.
[0017] Furthermore, the first terminal includes a first conductive column and a second conductive column, and the conductive connector includes a first conductive support plate and a second conductive support plate, and the first conductive support plate and the second conductive support plate are supported on the first conductive column and the second conductive column respectively.
[0018] According to the above technical features, the conductive connector is conductively connected to the first terminal through the first conductive support plate and the second conductive support plate, respectively, to improve the installation stability of the conductive connector. At the same time, in the utility model, the first conductive column and the second conductive column are respectively formed with a slide groove adapted to the first conductive support plate and the second conductive support plate, and one end of the conductive connector is movably connected to the first terminal, thereby realizing a swingable setting of the conductive connector.
[0019] Furthermore, the first conductive pillar and the second conductive pillar are arranged in parallel, and the first conductive support plate and the second conductive support plate are arranged in parallel.
[0020] According to the above technical features, the utility model reduces the volume of the micro switch by rationally utilizing the internal space of the micro switch. Specifically, the first conductive column and the second conductive column extend along the thickness direction of the base respectively, and there is a gap between the first conductive column and the second conductive column, and the other end of the support plate is located in the gap; correspondingly, there is a gap between the first conductive support plate and the second conductive support plate, and the elastic member is installed in the gap. When the other end of the support plate swings, the other end of the support plate causes the elastic member to deform, and when the deformation reaches a critical value, the elastic member drives the conductive connector to move, so that the first conductive contact contacts the second conductive contact or the third conductive contact.
[0021] Furthermore, it also includes a micro button and a shell, the shell is buckled on the base, the first terminal, the second terminal, the third terminal, the conductive connector, the support plate and the elastic member are located in the shell; the micro button penetrates the shell and contacts the other end of the support plate.
[0022] According to the above technical features, the housing is used to protect the first terminal, the second terminal, the third terminal, the conductive connector, the support plate and the elastic member inside the housing to prevent damage to the internal components. The micro-switch button is used to transmit the external force to the other end of the support plate.
[0023] Furthermore, the micro-button can move along the thickness direction of the base to drive the other end of the support plate to swing.
[0024] According to the above technical features, the micro button is used to control the opening or closing of the micro switch. Specifically, in the utility model, the second conductive contact and the third conductive contact are arranged at intervals along the thickness direction of the base, the first conductive contact is located between the second conductive contact and the third conductive contact, and the other end of the support plate is connected to the conductive connecting member through an elastic member, and then the other end of the support plate swings along the thickness direction of the base, so that the first conductive contact on the conductive connecting member can contact the second conductive contact or the third conductive contact.
[0025] Beneficial effects:
[0026] 1. The utility model realizes the switch control of the signal or circuit through a simple micro switch structure. Specifically, the first terminal is a common terminal, the second terminal and the third terminal are respectively a normally open terminal and a normally closed terminal. Due to the swingable setting of the conductive connecting member, when the first conductive contact on the conductive connecting member is close to the second conductive contact of the second terminal under the action of external force and conflicts with the second conductive contact, the normally open terminal is connected to complete the micro switch opening action; when the first conductive contact on the conductive connecting member is close to the third terminal under the action of external force and conflicts with the third conductive contact, the normally closed terminal is connected to complete the micro switch closing action.
[0027] 2. In the present invention, the second conductive contact and the third conductive contact are both multi-contact structures, so that when the third conductive contact abuts against the second conductive contact or the third conductive contact, even if one of the contacts is poorly contacted, they can still be turned on, thereby improving the reliability of the micro switch structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0029] Figure 2 This is a schematic diagram of the structure of the utility model in use state;
[0030] Figure 3 This is a schematic diagram of the packaging structure of the utility model.
[0031] Reference numerals:
[0032] 1- Base;
[0033] 2-first terminal, 21-first conductive column, 22-second conductive column;
[0034] 3-second terminal, 31-second conductive contact, 311-second sub-conductive contact 1, 312-second sub-conductive contact 2;
[0035] 4-third terminal, 41-third conductive contact, 411-third sub-conductive contact 1, 412-third sub-conductive contact 2;
[0036] 5-conductive connecting member, 51-first conductive contact, 52-first conductive support plate, 53-second conductive support plate;
[0037] 6-support plate, 7-elastic member, 8-micro-button, 9-housing.
[0038] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION
[0039] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.
[0040] like Figure 1 As shown, the present embodiment provides a micro switch structure, including: a base 1, a first terminal 2, a second terminal 3 and a third terminal 4, the first terminal 2, the second terminal 3 and the third terminal 4 respectively penetrate the base 1 along the thickness direction of the base 1; a conductive connector 5, one end of the conductive connector 5 is conductively connected to the first terminal 2, and the other end of the conductive connector 5 is provided with a first conductive contact 51; the second terminal 3 is provided with a second conductive contact 31, and the third terminal 4 is provided with a third conductive contact 41, and the second conductive contact 31 and the third conductive contact 41 are both multi-contact structures (multi-contact structures refer to two or more contact structures); the conductive connector 5 is swingably arranged so that the first conductive contact 51 can swing between the second conductive contact 31 and the third conductive contact 41 to contact the second conductive contact 31 or the third conductive contact 41.
[0041] In this embodiment, the switch control of the signal or circuit is realized by a simple micro switch structure. Specifically, the first terminal 2 is a common terminal, the second terminal 3 and the third terminal 4 are respectively a normally open terminal and a normally closed terminal. Since the conductive connecting member 5 is swingable, when the first conductive contact 51 on the conductive connecting member 5 is close to the second conductive contact 31 of the second terminal 3 under the action of external force and conflicts with the second conductive contact 31, the normally open terminal is turned on and the micro switch is turned on; when the first conductive contact 51 on the conductive connecting member 5 is close to the third terminal 4 under the action of external force and conflicts with the third conductive contact 41, the normally closed terminal is turned on and the micro switch is turned off.
[0042] In this embodiment, the second conductive contact 31 and the third conductive contact 41 are both multi-contact structures, so that when the third conductive contact 41 abuts against the second conductive contact 31 or the third conductive contact 41, even if one of the contacts is in poor contact, they can still be turned on, thereby improving the reliability of the micro switch structure.
[0043] like Figure 2 As shown, the second conductive contact 31 includes a second sub-conductive contact 1 311 and a second sub-conductive contact 2 312 . When the first conductive contact 51 contacts the second conductive contact 31 , it can contact the second sub-conductive contact 1 311 and / or the second sub-conductive contact 2 312 .
[0044] In this embodiment, the second conductive contact 31 is preferably a double-contact structure, and the second sub-conductive contact 311 and the second sub-conductive contact 312 can both abut against and conduct with the first conductive contact 51, and a certain angle is formed between the second sub-conductive contact 311 and the second sub-conductive contact 312, so that the first conductive contact 51 is not easily misaligned when abutting against the second conductive contact 31, thereby improving the reliability of the micro switch and reducing the production cost.
[0045] like Figure 2 As shown, the third conductive contact 41 includes a third sub-conductive contact 1 411 and a third sub-conductive contact 2 412 . When the first conductive contact 51 contacts the third conductive contact 41 , it can contact the third sub-conductive contact 1 411 and / or the third sub-conductive contact 2 412 .
[0046] In this embodiment, the third conductive contact 41 is preferably a double-contact structure, and the third sub-conductive contact 411 and the third sub-conductive contact 412 can both abut against and conduct with the first conductive contact 51, and an angle is formed between the third sub-conductive contact 411 and the third sub-conductive contact 412, so that the first conductive contact 51 and the third conductive contact 41 are not easily misaligned when abutting against each other, thereby improving the reliability of the micro switch and avoiding problems such as poor contact and unstable waveform of the micro switch during use.
[0047] like Figure 1 and Figure 2 As shown, it also includes a support plate 6 and an elastic member 7. One end of the support plate 6 is supported on the base 1, and the other end of the support plate 6 is swingably arranged, and the other end of the support plate 6 is connected to the conductive connecting member 5 through the elastic member 7.
[0048] In this embodiment, the support plate 6 and the elastic member 7 constitute a transmission element. When an external force acts on the other end of the support plate 6 or the elastic member 7 on the other end, the support plate 6 swings and the elastic member 7 is deformed. The elastic member 7 pulls the conductive connecting member 5 to change the original position of the first conductive contact 51 on the conductive connecting member 5, thereby realizing the switch control of the micro switch.
[0049] like Figure 1 and Figure 2 As shown, the elastic member 7 is a spring, one end of which is connected to the other end of the support plate 6, and the other end of which is connected to the other end of the conductive connector 5. In this embodiment, the spring has the characteristics of elastic deformation after being loaded and restoration after being unloaded, so that when the elastic member 7 is pressed by an external force, it can pull the conductive connector 5 to turn the switch on or off; when the external force disappears, the elastic member 7 rebounds, prompting the conductive connector 5 to automatically reset, thereby turning the switch off or on.
[0050] The second conductive contact 31 and the third conductive contact 41 are spaced apart in the thickness direction of the base 1, and the first conductive contact 51 is located between the second conductive contact 31 and the third conductive contact 41. As described above, one end of the support plate 6 is supported on the base 1. Figure 1 and Figure 2 The other end of the support plate 6 shown extends upward along the thickness direction of the base 1, and the other end of the support plate 6 is connected to the conductive connector 5 through the elastic member 7, so that the first conductive contact 51 on the conductive connector 5 has a tendency to move upward along the thickness direction of the base 1. Then, when there is no external force interference, the first conductive contact 51 abuts against the third conductive contact 41 of the normally closed terminal of the third terminal 4, and the micro switch is in a normally closed state. When an external force acts on the other end of the support plate 6, causing it to swing downward along the thickness direction of the base 1, the other end of the support plate 6 pulls the conductive connector 5 through the elastic member 7, so that the first conductive contact 51 is away from the third conductive contact 41 and close to the second conductive contact 31 of the normally open terminal of the second terminal 3, and the micro switch is in an open state.
[0051] This embodiment makes full use of space and reduces the size of the micro switch. At the same time, since the first conductive contact 51 is located between the second conductive contact 31 and the third conductive contact 41, the first conductive contact 51 only needs to move a short stroke to contact the second conductive contact 31 and the third conductive contact 41, and the switch operates quickly.
[0052] like Figure 1 and Figure 2 As shown, the first terminal 2 includes a first conductive column 21 and a second conductive column 22, and the conductive connector 5 includes a first conductive support plate 52 and a second conductive support plate 53, and the first conductive support plate 52 and the second conductive support plate 53 are respectively supported on the first conductive column 21 and the second conductive column 22. The conductive connector 5 is conductively connected to the first terminal 2 through the first conductive support plate 52 and the second conductive support plate 53, respectively, to improve the installation stability of the conductive connector 5. At the same time, in this embodiment, the first conductive column 21 and the second conductive column 22 are respectively formed with a sliding groove adapted to the first conductive support plate 52 and the second conductive support plate 53, and one end of the conductive connector 5 is movably connected to the first terminal 2, thereby realizing the swingable setting of the conductive connector 5.
[0053] like Figure 1 and Figure 2 As shown, the first conductive pillar 21 and the second conductive pillar 22 are arranged in parallel, and the first conductive support plate 52 and the second conductive support plate 53 are arranged in parallel.
[0054] This embodiment reduces the volume of the micro switch by reasonably utilizing the internal space of the micro switch. Specifically, the first conductive column 21 and the second conductive column 22 extend along the thickness direction of the base 1 respectively, and there is a gap between the first conductive column 21 and the second conductive column 22, and the other end of the support plate 6 is located in the gap; correspondingly, there is a gap between the first conductive support plate 52 and the second conductive support plate 53, and the elastic member 7 is installed in the gap. When the other end of the support plate 6 swings along the thickness direction of the base 1, the other end of the support plate 6 causes the elastic member 7 to deform. When the deformation reaches a critical value, the elastic member 7 drives the conductive connector 5 to move, so that the first conductive contact 51 contacts the second conductive contact 31 or the third conductive contact 41.
[0055] like Figure 2 and Figure 3 As shown, it also includes a micro button 8 and a shell 9, the shell 9 is buckled on the base 1, and the first terminal 2, the second terminal 3, the third terminal 4, the conductive connector 5, the support plate 6 and the elastic member 7 are located in the shell 9; the micro button 8 penetrates the shell 9 and contacts the other end of the support plate 6. The shell is used to protect the first terminal 2, the second terminal 3, the third terminal 4, the conductive connector 5, the support plate 6 and the elastic member 7 inside it to prevent damage to the internal components. The micro button 8 is used to transmit external force to the other end of the support plate 6.
[0056] like Figure 2 and Figure 3 As shown, the micro-button 8 can move along the thickness direction of the base 1 to drive the other end of the support plate 6 to swing. As described above, one end of the support plate 6 is supported on the base 1. Figure 1 and Figure 2 The other end of the support plate 6 shown extends upward along the thickness direction of the base 1, and the other end of the support plate 6 is connected to the conductive connector 5 through the elastic member 7, so that the first conductive contact 51 on the conductive connector 5 has a tendency to move upward along the thickness direction of the base 1. Then, when there is no external force interference, the first conductive contact 51 abuts against the third conductive contact 41 of the normally closed terminal of the third terminal 4, and the micro switch is in a normally closed state. When an external force acts on the other end of the support plate 6, causing it to swing downward along the thickness direction of the base 1, the other end of the support plate 6 pulls the conductive connector 5 through the elastic member 7, so that the first conductive contact 51 is away from the third conductive contact 41 and close to the second conductive contact 31 of the normally open terminal of the second terminal 3, and the micro switch is in an open state.
[0057] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0058] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.
Claims
1. A micro switch structure, characterized in that: include: A base (1), a first terminal (2), a second terminal (3) and a third terminal (4), wherein the first terminal (2), the second terminal (3) and the third terminal (4) respectively penetrate the base (1) along the thickness direction of the base (1); A conductive connecting member (5), one end of the conductive connecting member (5) being conductively connected to the first terminal (2), and the other end of the conductive connecting member (5) being provided with a first conductive contact (51); The second terminal (3) is provided with a second conductive contact (31), the third terminal (4) is provided with a third conductive contact (41), and both the second conductive contact (31) and the third conductive contact (41) are multi-contact structures; The conductive connecting member (5) is swingably arranged so that the first conductive contact (51) can swing between the second conductive contact (31) and the third conductive contact (41) to contact the second conductive contact (31) or the third conductive contact (41).
2. The micro switch structure according to claim 1, characterized in that: The second conductive contact (31) comprises a second sub-conductive contact one (311) and a second sub-conductive contact two (312); when the first conductive contact (51) contacts the second conductive contact (31), it can contact the second sub-conductive contact one (311) and / or the second sub-conductive contact two (312).
3. The micro switch structure according to claim 1 or 2, characterized in that: The third conductive contact (41) comprises a third sub-conductive contact one (411) and a third sub-conductive contact two (412); when the first conductive contact (51) contacts the third conductive contact (41), it can contact the third sub-conductive contact one (411) and / or the third sub-conductive contact two (412).
4. The micro switch structure according to claim 1, characterized in that: It also includes a support plate (6) and an elastic member (7), one end of the support plate (6) is supported on the base (1), the other end of the support plate (6) is swingably arranged, and the other end of the support plate (6) is connected to the conductive connecting member (5) via the elastic member (7).
5. The micro switch structure according to claim 4, characterized in that: The elastic member (7) is a spring, one end of which is connected to the other end of the support plate (6), and the other end of which is connected to the other end of the conductive connecting member (5).
6. The micro switch structure according to claim 1, characterized in that: The second conductive contact (31) and the third conductive contact (41) are arranged at intervals along the thickness direction of the base (1), and the first conductive contact (51) is located between the second conductive contact (31) and the third conductive contact (41).
7. The micro switch structure according to claim 1, characterized in that: The first terminal (2) comprises a first conductive column (21) and a second conductive column (22), and the conductive connecting member (5) comprises a first conductive support plate (52) and a second conductive support plate (53), wherein the first conductive support plate (52) and the second conductive support plate (53) are respectively supported on the first conductive column (21) and the second conductive column (22).
8. The micro switch structure according to claim 7, characterized in that: The first conductive column (21) and the second conductive column (22) are arranged in parallel, and the first conductive support plate (52) and the second conductive support plate (53) are arranged in parallel.
9. The micro switch structure according to claim 4, characterized in that: It also comprises a micro-motion button (8) and a shell (9), wherein the shell (9) is buckled on the base (1), and the first terminal (2), the second terminal (3), the third terminal (4), the conductive connecting member (5), the support plate (6) and the elastic member (7) are located inside the shell (9); the micro-motion button (8) penetrates the shell (9) and contacts the other end of the support plate (6).
10. The micro switch structure according to claim 9, characterized in that: The micro-motion button (8) is capable of moving along the thickness direction of the base (1) to drive the other end of the support plate (6) to swing.