A miniature cam switch

Abstract

The application discloses a micro cam switch and relates to the technical field of cam switches. The outer wall of a conductive sheet is connected with the inner wall of a mounting shell through a spring. A moving contact is fixedly connected to the side of the conductive sheet close to a rotating rod. The inner wall of the mounting shell is fixedly connected with a stationary contact. The outer wall of the stationary contact is in contact with the outer wall of the moving contact. The outer wall of the side of a sliding block close to a cam is fixedly connected with a protruding block. The side of the conductive sheet away from the cam is provided with a moving mechanism. The front side of a front plate is provided with a rotating mechanism. The application is provided with a power supply module, an electromagnet, a magnet and an insulating connecting frame. The energy of the capacitor is released instantaneously to drive the electromagnet to move at the moment when the moving contact and the stationary contact are disconnected. The moving contact is quickly separated from the stationary contact by using magnetic repulsion. The arc discharge phenomenon caused by the slow rotation of the cam by human beings is effectively reduced. The application has the characteristics of high practicability and improved power-off reaction speed of the micro cam switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cam switch, in particular to a micro cam switch. BACKGROUND

[0002] At present, the micro cam switch is widely used in household appliances, automation devices, instruments and meters and other occasions requiring circuit on-off control, due to its compact structure, simple operation, high mechanical stability and other characteristics, it is suitable for application environment with limited space but requiring frequent switching operation. However, in the process of frequent on-off, the traditional micro cam switch has the following technical problems:

[0003] Firstly, since the cam structure continuously drives the closure and disconnection of the internal contact during rotation, the contact is easy to arc discharge at the moment of on-off, especially in the case of slow disconnection speed or large load current, the arc not only causes contact ablation, but also may produce high temperature in the narrow space, causing local carbonization and even component damage;

[0004] Secondly, the return spring in the traditional micro switch is easy to cause metal fatigue after long-term frequent compression deformation, resulting in insufficient rebound force, thereby causing poor contact or "virtual connection" phenomenon of the contact, affecting the reliability of the circuit, especially in the trend of device miniaturization and high-frequency operation, the problem is more prominent;

[0005] The existing patent with publication number CN100361245C discloses a quick on-off self-cleaning cam switch, which adopts a support located at the concave point of the cam for off state, and located at the convex point of the cam for on state. In the rotation process of the switch, the cam rotation causes the support to slide parallelly, and the metal supporting member moves simultaneously, the moving contact on both sides of the metal supporting member moves at a very fast speed under the action of the spring force after exceeding the balance position, realizing the quick on and off of the moving and static contacts, and improving the on and off speed of the contacts. However, the device uses the cam to drive the movement of the metal supporting member, and the spring will cause insufficient contact pressure between the moving and static contacts due to metal fatigue during long-term use, thereby causing poor contact;

[0006] Therefore, how to improve the off reaction speed of the micro cam switch in limited space, suppress the arc, improve the contact stability, and visually monitor the spring fatigue state, is one of the key problems in the technical optimization of the device, and an improved scheme of the micro cam switch with compact structure, rapid response and high reliability is urgently needed. SUMMARY

[0007] The present application aims to provide a micro cam switch to solve the problems in the background art.

[0008] In order to solve the above technical problems, the present application provides the following technical solutions: a miniature cam switch, comprising a mounting shell, a front plate is arranged on the front side of the mounting shell, the inside of the mounting shell is a hollow structure, and a rear plate is fixedly connected to the rear side of the mounting shell, a rotating plate is rotatably connected to the front side of the front plate through a bearing, a rotating rod is fixedly connected to the rear side of the rotating plate, the rotating rod penetrates through the front plate and the mounting shell and extends to the inside of the mounting shell, a cam is fixedly connected to the outer wall of the rotating rod in the inside of the mounting shell, a side plate is fixedly connected to the inner wall of the mounting shell, a sliding block is slidably connected to the outer wall of the side plate, a conductive sheet is fixedly connected to the side of the sliding block away from the rotating rod, the outer wall of the conductive sheet is connected to the inner wall of the mounting shell through a spring, a moving contact is fixedly connected to the side of the conductive sheet close to the rotating rod, a stationary contact is fixedly connected to the inner wall of the mounting shell, the outer wall of the stationary contact is in contact with the outer wall of the moving contact, a protruding block is fixedly connected to the outer wall of the side of the sliding block close to the cam, a moving mechanism is arranged on the side of the conductive sheet away from the cam, and a rotating mechanism is arranged on the front side of the front plate.

[0009] The moving mechanism comprises a transmission assembly, a power supply module and an electromagnet, and the electromagnet can move relative to the mounting shell.

[0010] The power supply module can be charged when the moving contact and the stationary contact are in contact, and can supply power to the electromagnet after the moving contact and the stationary contact are separated.

[0011] The electromagnet can drive the conductive sheet to move away from the cam after the moving contact and the stationary contact are separated by the cam pushing the protruding block to displace.

[0012] According to the above technical solutions, the cam is a columnar structure with a groove arranged on the outer wall, one end of the protruding block extends to the inside of the groove of the outer wall of the cam, and the cam can rotate to push the protruding block to translate.

[0013] According to the above technical solutions, the upper part of the conductive sheet and the lower part of the conductive sheet are both provided with moving contacts, the inner wall of the mounting shell is provided with stationary contacts corresponding to the positions of the moving contacts, and the moving contact and the stationary contact can be separated after the protruding block is pushed by the cam.

[0014] According to the above technical solutions, the transmission assembly further comprises an insulating connecting frame, one end of the insulating connecting frame is fixedly connected to the outer wall of the conductive sheet away from the cam, the other end of the insulating connecting frame is fixedly connected to the outer wall of the electromagnet away from the conductive sheet, the inner wall of the mounting shell is fixedly connected with an extension rod, one end of the extension rod extends to between the electromagnet and the conductive sheet, the outer wall of one end of the extension rod between the electromagnet and the conductive sheet is fixedly connected with a fixed sleeve, and a magnet is fixedly connected to the middle part of the fixed sleeve.

[0015] According to the technical scheme, the outer wall of the power supply module is fixedly connected with the inner wall of the mounting shell, and the power supply module comprises a capacitor module, which is used for storing electric energy during contact and power supply of the moving contact and the stationary contact and releasing the energy at the moment of disconnection of the moving contact and the stationary contact.

[0016] The power supply module further comprises a rectification and voltage stabilization module and a MOSFET control module, and the MOSFET control module is used for controlling the charge and discharge of the capacitor module and conducting the discharge path at the moment of disconnection of the moving contact and the stationary contact.

[0017] The input end of the power supply module is electrically connected with the conducting path between the moving contact and the stationary contact, and the output end of the power supply module is electrically connected with the electromagnet.

[0018] According to the technical scheme, the side of the electromagnet close to the magnet is opposite to the side of the magnet close to the electromagnet in magnetic polarity after the electromagnet is powered on, and the repulsive force between the electromagnet and the magnet after the electromagnet is powered on is greater than the force required for spring deformation.

[0019] According to the technical scheme, the rotating mechanism comprises a baffle, the outer wall of the baffle is fixedly connected with the front side of the rotating plate, the front side of the baffle is connected with a rotating sleeve through a ratchet structure, the rotating sleeve is fixedly connected with a pressing plate on the side close to the rotating plate, the pressing plate is fixedly connected with a pressure detection module on the side close to the baffle, the outer wall of one side of the pressure detection module is in contact with the outer wall of the baffle, and the front side of the rotating sleeve is fixedly connected with a display module.

[0020] According to the technical scheme, the ratchet mechanism at the connection between the rotating plate and the rotating sleeve can only support the rotating sleeve to drive the pressing plate to rotate towards the side of the baffle, and the pressure detection module is electrically connected with the display module.

[0021] Compared with the prior art, the present application has the following beneficial effects: by arranging the cam and the groove structure on the outer wall of the cam, the cam can drive the cam block to translate along the predetermined track when the rotating rod rotates, so that the moving contact and the stationary contact on the conductive sheet can realize controllable contact and separation, thereby realizing stable on-off control of the micro switch in a limited space and improving the reliability and accuracy of circuit switching.

[0022] By arranging the power supply module, the electromagnet, the magnet and the insulating connecting frame, the electromagnet is driven to move by the instantaneous release of energy of the capacitor at the moment of disconnection of the moving contact and the stationary contact, the moving contact is quickly separated from the stationary contact by using magnetic repulsion, the electric arc discharge phenomenon caused by too slow rotation of the cam is effectively reduced, and the durability and safety of the device are improved.

[0023] By setting the structure with electromagnetic drive conductive sheet movement, combined with the spring elastic energy storage and rebound, the convex block can hit the cam after the conductive sheet instantaneous movement, and then cause the conductive sheet and the moving contact to vibrate as a whole, effectively removing the particles and electrostatic adsorption on the surface of the moving contact due to contact with the static contact, significantly improving the contact stability after multiple actions, preventing false connection and sharp discharge problems.

[0024] By setting the rotating sleeve, pressure detection module and display module, the pressure value required for spring deformation is displayed during the disconnection of the switch, which facilitates the user to judge whether the spring has metal fatigue or performance attenuation, avoids the poor contact or false contact phenomenon of the moving contact and the static contact due to insufficient spring force, and ensures the reliability and service life of the device under high frequency operation. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation on the application. In the drawings:

[0026] Figure 1 is a perspective view of the present application;

[0027] Figure 2 is a rear side structure schematic view of the present application;

[0028] Figure 3 is a schematic view of the internal structure of the mounting shell of the present application;

[0029] Figure 4 is a schematic view of the local structure of the present application;

[0030] Figure 5 is a schematic view of the moving mechanism structure of the present application;

[0031] Figure 6 is a schematic view of the split structure of the rotating mechanism of the present application;

[0032] Figure 7 is a schematic view of the rear side structure of the rotating sleeve of the present application;

[0033] In the drawings: 1, mounting shell; 2, front plate; 3, rear plate; 4, rotating plate; 5, rotating rod; 6, cam; 7, side plate; 8, sliding block; 9, conductive sheet; 10, spring; 11, moving contact; 12, convex block; 13, moving mechanism; 14, rotating mechanism; 15, static contact; 301, power supply module; 302, insulating connecting frame; 303, electromagnet; 304, extension rod; 305, fixed sleeve; 306, magnet; 401, baffle; 402, rotating sleeve; 403, pressing plate; 404, pressure detection module; 405, display module. DETAILED DESCRIPTION

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0035] Embodiment one:

[0036] Please refer to Figures 1-3 The present application provides a technical solution: a micro cam switch, comprising a mounting shell 1, the front side of the mounting shell 1 is provided with a front plate 2, the inside of the mounting shell 1 is a hollow structure, and the rear side of the mounting shell 1 is fixedly connected with a rear plate 3, the front side of the front plate 2 is rotatably connected with a rotating plate 4 through a bearing, the rear side of the rotating plate 4 is fixedly connected with a rotating rod 5, the rotating rod 5 penetrates the front plate 2, the mounting shell 1 and extends to the inside of the mounting shell 1, the outer wall of the rotating rod 5 at the inside of the mounting shell 1 is fixedly connected with a cam 6, the inner wall of the mounting shell 1 is fixedly connected with a side plate 7, the outer wall of the side plate 7 is slidably connected with a sliding block 8, the side away from the rotating rod 5 of the sliding block 8 is fixedly connected with a conductive sheet 9, the outer wall of the conductive sheet 9 is connected with the inner wall of the mounting shell 1 through a spring 10, the side close to the rotating rod 5 of the conductive sheet 9 is fixedly connected with a moving contact 11, and the inner wall of the mounting shell 1 is fixedly connected with a stationary contact 15, the outer wall of the stationary contact 15 is in contact with the outer wall of the moving contact 11, the outer wall of the side close to the cam 6 of the sliding block 8 is fixedly connected with a protruding block 12, the side away from the cam 6 of the conductive sheet 9 is provided with a moving mechanism 13, the front side of the front plate 2 is provided with a rotating mechanism 14, the cam 6 is a columnar structure with a groove on the outer wall, one end of the protruding block 12 extends to the inside of the groove on the outer wall of the cam 6, and the cam 6 can rotate, the cam 6 can push the protruding block 12 to translate during the rotating process, the upper part of the conductive sheet 9 and the lower part of the conductive sheet 9 are both provided with the moving contact 11, the positions corresponding to the moving contact 11 of the inner wall of the mounting shell 1 are both provided with the stationary contact 15, and the protruding block 12 can make the moving contact 11 separate from the stationary contact 15 after being pushed by the cam 6;

[0037] In the application process of the device, the front plate 2 and the mounting shell 1 are respectively fixedly installed to predetermined positions, two static contacts 15 are connected to an external circuit through wires, the two static contacts 15 are not in contact to form an open circuit, the cam 6 is rotated in the mounting shell 1 by the rotation of the rotating rod 5, and due to the groove structure of the outer wall of the cam 6, the surface groove of the cam 6 is rotated to the side of the protruding block 12, so that the spring 10 supports the conductive sheet 9 and the movable contact 11 to move to the side close to the cam 6, at this time, since the two static contacts 15 are connected to an external power supply, the conductive sheet 9 moves to contact the two static contacts 15, the current passes through the two movable contacts 11, the conductive sheet 9 and the static contacts 15 to form a passage, thereby making the circuit connected, when the rotating rod 5 is rotated to continuously rotate the cam 6, the cam 6 pushes the protruding block 12 to the side away from the cam 6, so that the conductive sheet 9 and the movable contact 11 move to the side away from the cam 6, and the spring 10 is compressed to deform and store energy, at this time, the movable contact 11 is disconnected from the static contact 15, thereby making the circuit disconnected and stopping power supply, and this process can complete the power supply and disconnection process.

[0038] Example two:

[0039] Please refer to Figures 1-5On the basis of embodiment one, a technical solution is provided: the moving mechanism 13 comprises a transmission assembly, a power supply module 301 and an electromagnet 303. The electromagnet 303 can move relative to the mounting shell 1. The power supply module 301 can be charged when the movable contact 11 contacts the static contact 15, and can supply power to the electromagnet 303 after the movable contact 11 separates from the static contact 15. The electromagnet 303 can drive the conductive sheet 9 to move away from the cam 6 after the cam 6 pushes the protrusion 12 to displace the movable contact 11 and separate from the static contact 15. The transmission assembly further comprises an insulating connecting frame 302. One end of the insulating connecting frame 302 is fixedly connected to the outer wall of the conductive sheet 9 away from the cam 6. The other end of the insulating connecting frame 302 is fixedly connected to the outer wall of the electromagnet 303. The inner wall of the mounting shell 1 is fixedly connected with an extension rod 304. One end of the extension rod 304 extends to between the electromagnet 303 and the conductive sheet 9. The outer wall of one end of the extension rod 304 between the electromagnet 303 and the conductive sheet 9 is fixedly connected with a fixed sleeve 305. The middle part of the fixed sleeve 305 is fixedly connected with a magnet 306. The outer wall of the power supply module 301 is fixedly connected with the inner wall of the mounting shell 1. The power supply module 301 comprises a capacitor module. The capacitor module is used to store electrical energy during the contact and power supply of the movable contact 11 and the static contact 15, and release energy at the moment of disconnection of the movable contact 11 and the static contact 15. The power supply module 301 further comprises a rectifier and voltage stabilizing module and a MOSFET control module. The MOSFET control module is used to control the charge and discharge of the capacitor module, and turn on the discharge path at the moment of disconnection of the movable contact 11 and the static contact 15. The input end of the power supply module 301 is electrically connected with the conduction path between the movable contact 11 and the static contact 15. The output end of the power supply module 301 is electrically connected with the electromagnet 303. The side of the electromagnet 303 close to the magnet 306 is opposite to the side of the magnet 306 close to the electromagnet 303 after the electromagnet 303 is powered on. The repulsive force between the electromagnet 303 and the magnet 306 is greater than the force required for the spring 10 to deform after the electromagnet 303 is powered on.

[0040] When the movable contact 11 contacts the static contact 15 to form a conduction path, the capacitor module in the power supply module 301 is charged, so that the capacitor module is charged to a value close to the voltage of the main circuit. When the circuit is closed, the cam 6 pushes the protrusion 12 to move. At the moment of disconnection of the movable contact 11 and the static contact 15, the power supply module 301 supplies power to the electromagnet 303, so that the electromagnet 303 generates instantaneous magnetism. The electromagnet 303 moves away from the magnet 306 due to the repulsive force between the electromagnet 303 and the magnet 306. The electromagnet 303 drives the insulating connecting frame 302 and the conductive sheet 9 to move away from the static contact 15 instantaneously, thereby reducing the arc discharge between the movable contact 11 and the static contact 15 caused by slow speed when rotating the cam 6, and reducing the possibility of damage to the device caused by high temperature and arc discharge in a narrow space.

[0041] Embodiment three:

[0042] Please refer toFigures 1-5 On the basis of embodiment one and embodiment two, a technical solution is provided: at the moment when the moving contact 11 is disconnected from the static contact 15, the electromagnet 303 will drive the conductive sheet 9 to move away from the static contact 15 side instantaneously. During this process, since the repulsive force between the electromagnet 303 and the magnet 306 after the electromagnet 303 is powered on is greater than the force required for the spring 10 to deform, the conductive sheet 9 will compress the spring 10 to shrink and deform. Subsequently, since the power supply module 301 instantaneously ends the discharge, at this time the speed of the hand rotating cam 6 has not caused the outer wall of the cam 6 to contact the position of the rotating protrusion 12, so at this time the spring 10 will rebound, thereby causing the spring 10 to push the protrusion 12 to hit the outer wall of the cam 6, causing the conductive sheet 9 and the moving contact 11 to vibrate, causing the debris and adhesives generated by the contact between the moving contact 11 and the static contact 15 and electrostatic adsorption to be shaken off, avoiding the situation of poor contact or generating sharp discharge when subsequently contacting the static contact 15, and ensuring the stability of use.

[0043] Embodiment four:

[0044] Please refer to Figures 1-7 On the basis of embodiment one, embodiment two, and embodiment three, a technical solution is provided: the rotating mechanism 14 includes a baffle 401, the outer wall of the baffle 401 is fixedly connected to the front side of the rotating plate 4, the baffle 401 is connected to a rotating sleeve 402 through a ratchet structure on the front side, the rotating sleeve 402 is fixedly connected to a pressing plate 403 on the side close to the rotating plate 4, the pressing plate 403 is fixedly connected to a pressure detection module 404 on the side close to the baffle 401, the outer wall of one side of the pressure detection module 404 is in contact with the outer wall of the baffle 401, and the front side of the rotating sleeve 402 is fixedly connected to a display module 405. The ratchet mechanism at the connection between the rotating plate 4 and the rotating sleeve 402 can only support the rotating sleeve 402 to rotate the pressing plate 403 towards the side of the baffle 401, and the pressure detection module 404 is electrically connected to the display module 405.

[0045] When it is necessary to close the device to form a break between the moving contact 11 and the static contact 15, the rotating sleeve 402 needs to be rotated to the right by hand, which will cause the pressure detection module 404 to be squeezed between the pressing plate 403 and the baffle 401. The display module 405 is electrically connected to the pressure detection module 404, so the display module 405 will display the pressure value of the pressure detection module 404. Since the electromagnet 303 only starts to work after the moving contact 11 is disconnected from the static contact 15, before the moving contact 11 is separated from the static contact 15, the rotating sleeve 402 needs to be rotated to make the cam 6 first push the protrusion 12 to move. During this process, the pressure on the pressure detection module 404 depends on the pressure required for the spring 10 to deform, thereby enabling the staff to intuitively display the pressure required for the spring 10 to deform when closing the device, avoiding the situation of weak rebound caused by metal fatigue of the spring 10 due to frequent opening and closing, thereby avoiding the situation of virtual connection and poor contact between the moving contact 11 and the static contact 15, and thereby avoiding the situation of arc discharge caused by the gap.

[0046] The present application provides a micro-cam switch suitable for high-frequency operation scenarios, which realizes accurate on-off control between the moving contact 11 and the static contact 15 by setting the cam 6 with a groove structure to drive the linkage assembly; in combination with the power supply module 301, the electromagnet 303 and the magnet 306, the contacts are quickly separated at the moment of disconnection, significantly reducing the risk of arc discharge; the spring 10 energy storage rebound structure is introduced, which triggers micro-vibration to remove contact impurities by impact after disconnection, improving contact stability; in addition, the deformation pressure of the elastic member can be monitored through the rotating mechanism 14, which assists in judging the elastic fatigue state, effectively improving the reliability, safety and service life of the device in the frequent switching process.

[0047] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0048] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and does not limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or replace some technical features with equivalent ones. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A micro cam switch, comprising a mounting shell (1), the front side of the mounting shell (1) is provided with a front plate (2), the inside of the mounting shell (1) is a hollow structure, and the rear side of the mounting shell (1) is fixedly connected with a rear plate (3), the front side of the front plate (2) is rotatably connected with a rotating plate (4) through a bearing, the rear side of the rotating plate (4) is fixedly connected with a rotating rod (5), the rotating rod (5) penetrates through the front plate (2) and the mounting shell (1) and extends to the inside of the mounting shell (1), the outer wall of the rotating rod (5) at the inside of the mounting shell (1) is fixedly connected with a cam (6), the inner wall of the mounting shell (1) is fixedly connected with a side plate (7), the outer wall of the side plate (7) is slidably connected with a sliding block (8), the side, away from the rotating rod (5), of the sliding block (8) is fixedly connected with a conductive sheet (9), the outer wall of the conductive sheet (9) is connected with the inner wall of the mounting shell (1) through a spring (10), the side, close to the rotating rod (5), of the conductive sheet (9) is fixedly connected with a moving contact (11), the inner wall of the mounting shell (1) is fixedly connected with a stationary contact (15), the outer wall of the stationary contact (15) is in contact with the outer wall of the moving contact (11), and the outer wall, close to the cam (6), of the sliding block (8) is fixedly connected with a protruding block (12). The conductive sheet (9) is provided with a moving mechanism (13) away from one side of the cam (6), and the front side of the front plate (2) is provided with a rotating mechanism (14); The moving mechanism (13) comprises a transmission assembly, a power supply module (301) and an electromagnet (303), and the electromagnet (303) can move relative to the installation shell (1); The power supply module (301) can be charged when the movable contact (11) contacts the static contact (15), and can supply power to the electromagnet (303) after the movable contact (11) is separated from the static contact (15); The electromagnet (303) can drive the conductive sheet (9) to move away from one side of the cam (6) after the cam (6) pushes the cam (6) to separate the movable contact (11) from the static contact (15).

2. A micro-cam switch according to claim 1, wherein: The cam (6) is a cylindrical structure with a groove on the outer wall, one end of the cam (12) extends into the groove of the outer wall of the cam (6), and the cam (6) can rotate, and the cam (6) can push the cam (12) to translate during rotation.

3. A micro-cam switch according to claim 2, wherein: The upper part of the conductive sheet (9) and the lower part of the conductive sheet (9) are provided with movable contacts (11), and the inner wall of the installation shell (1) is provided with static contacts (15) corresponding to the positions of the movable contacts (11), and the cam (12) is pushed by the cam (6) to separate the movable contact (11) from the static contact (15).

4. A micro-cam switch according to claim 3, wherein: The transmission assembly further comprises an insulating connecting frame (302), one end of the insulating connecting frame (302) is fixedly connected with the outer wall of the conductive sheet (9) away from the cam (6), the other end of the insulating connecting frame (302) is fixedly connected with the outer wall of the electromagnet (303), the inner wall of the installation shell (1) is fixedly connected with an extension rod (304), one end of the extension rod (304) extends between the electromagnet (303) and the conductive sheet (9), and the outer wall of one end of the extension rod (304) between the electromagnet (303) and the conductive sheet (9) is fixedly connected with a fixed sleeve (305), and the middle part of the fixed sleeve (305) is fixedly connected with a magnet (306).

5. A micro-cam switch according to claim 4, wherein: The outer wall of the power supply module (301) is fixedly connected with the inner wall of the installation shell (1), and the power supply module (301) comprises a capacitor module, which is used for storing electric energy during the contact of the movable contact (11) and the static contact (15), and releasing energy at the moment of disconnection of the movable contact (11) and the static contact (15); The power supply module (301) further comprises a rectifier and voltage stabilizing module and a MOSFET control module, the MOSFET control module is used for controlling the charge and discharge of the capacitor module, and the discharge path is turned on at the moment of disconnection of the movable contact (11) and the static contact (15); The input end of the power supply module (301) is electrically connected with the conduction path between the movable contact (11) and the static contact (15), and the output end of the power supply module (301) is electrically connected with the electromagnet (303).

6. A micro-cam switch according to claim 5, wherein: The opposite magnetic poles of the one side of the electromagnet (303) close to the magnet (306) and the one side of the magnet (306) close to the electromagnet (303) are opposite after the electromagnet (303) is electrified, and the repulsive force between the electromagnet (303) and the magnet (306) is greater than the force required for the deformation of the spring (10).

7. A micro-cam switch according to claim 6, wherein: The rotating mechanism (14) comprises a baffle (401), the outer wall of the baffle (401) is fixedly connected with the front side of the rotating plate (4), the front side of the baffle (401) is connected with a rotating sleeve (402) through a ratchet structure, the rotating sleeve (402) is fixedly connected with a pressing plate (403) close to one side of the rotating plate (4), the pressing plate (403) is fixedly connected with a pressure detection module (404) close to one side of the baffle (401), the outer wall of one side of the pressure detection module (404) is in contact with the outer wall of the baffle (401), and the front side of the rotating sleeve (402) is fixedly connected with a display module (405).

8. A micro-cam switch according to claim 7, wherein: The ratchet mechanism at the connection between the rotating plate (4) and the rotating sleeve (402) can only support the rotating sleeve (402) to drive the pressing plate (403) to rotate towards one side of the baffle (401), and the pressure detection module (404) is electrically connected with the display module (405).

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