Non-contact signal switch
Through contactless signal switch, Hall sensors and magnetic inductors are used to detect magnet positions to achieve contactless speed regulation, solving the arc and wear problems of traditional mechanical contact switches and improving the safety and accuracy of the switch.
Patent Information
- Application Number
- CN202420962204.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-07
AI Technical Summary
Traditional mechanical contact switches are prone to arcing when they are opened and closed, which affects the safety of use, and the wear of the speed control carbon film leads to a decrease in the speed control accuracy.
The contactless signal switch is adopted, and the Hall sensor is used to detect the position of the speed-regulating magnet and emit a signal. The magnetic inductor induces the position of the opening and closing magnets, and controls the output power and switching state of the electrical equipment through the electrical signal, avoiding contact wear and arcing.
It solves the problem that traditional mechanical contact switches are prone to arcing and reduced speed regulation accuracy when opening and closing, and improves the working safety and service life of the switch.
Smart Images
Figure CN222674297U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of switches, and in particular relates to a contactless signal switch. Background Art
[0002] The switch is one of the most commonly used electrical components in electrical equipment. Switches with speed regulation function are usually used on power tools. Such switches are usually mechanical. The switch opening and closing and speed regulation are achieved by the contact between the metal spring and the carbon film on the PCB. When using this switch, the contact between the metal spring and the carbon film may generate an arc, affecting the safety of use. In addition, the long-term friction between the metal spring and the carbon film will cause the carbon film to wear, which will lead to changes in the resistance of the carbon film, resulting in a decrease in the speed regulation accuracy and affecting the completeness of the use of the power tool. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a contactless signal switch to solve the technical problems that the traditional mechanical contact switch is prone to arc generation during opening and closing, affecting the safety of the switch, and the speed regulating carbon film is worn, causing the speed regulating accuracy to decrease.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a contactless signal switch, comprising a shell, a push rod movably plugged into the shell, the push rod can slide back and forth along its axial direction, one end of the push rod extends out of the shell, the other end is inserted into the shell and fixedly connected with a slider, the slider is slidably connected to the inner wall of the shell and the sliding direction is parallel to the axial direction of the push rod, the slider is elastically connected to the shell through an elastic member, the elastic member is compressed when the push rod moves into the shell, and the elastic member is reset when the push rod is released to push the push rod to move out of the shell and reset, a PCB board is also arranged in the shell, a Hall sensor is arranged on the PCB board, a speed regulating magnet corresponding to the Hall sensor is connected to the slider, the Hall sensor and the speed regulating magnet are discretely arranged along the sliding direction of the slider, the speed regulating magnet moves synchronously with the slider, the Hall sensor detects the position of the speed regulating magnet and sends a signal, a magnetic sensor is also arranged on the PCB board, an opening and closing magnet cooperating with the magnetic sensor is connected to the slider, the magnetic sensor and the opening and closing magnet are arranged in a direction perpendicular to the axial direction of the push rod, the magnetic sensor is used to detect the position of the opening and closing magnet, and the opening and closing magnet and the Hall sensor are staggered.
[0005] As a preferred solution, the PCB board is parallel to the axial direction of the push rod and is arranged on one side of the slider. One side of the slider is provided with an assembly hole extending along the axial direction of the push rod, and the speed regulating magnet is installed in the assembly hole. The other side of the slider is provided with an assembly groove perpendicular to the axial direction of the push rod, and the opening and closing magnet is embedded in the assembly groove.
[0006] As a preferred solution, the PCB board is connected with a speed regulation signal output wire, at least one power input wire, an opening and closing signal output wire and a ground wire. The speed regulation signal output wire is electrically connected to the signal output pin of the Hall sensor through the printed circuit on the PCB board, the power input wire supplies power to the Hall sensor and the magnetic sensor through the printed circuit on the PCB board, the opening and closing signal output wire is electrically connected to the output pin of the magnetic sensor through the printed circuit on the PCB board, and the ground pins of the Hall sensor and the magnetic sensor are both electrically connected to the ground wire through the printed circuit on the PCB board.
[0007] As a preferred solution, a positioning pin parallel to the sliding direction of the slider is arranged in the shell, the elastic member is a pre-compressed coil spring, a spring hole is opened at the end of the slider facing away from the push rod, one end of the coil spring is inserted into the spring hole, and the other end is sleeved on the positioning pin, and a radially outward protruding convex ring is arranged at the end of the positioning pin away from the slider, and the end of the coil spring away from the slider abuts against the convex ring. Under the action of the elastic force of the coil spring, the end of the positioning pin away from the slider abuts against the inner wall of the shell.
[0008] As a preferred solution, the shell includes a base and a cover body connected to each other up and down, and a semicircular groove is respectively opened on the side wall on the same side of the base and the cover body, and the two semicircular grooves are connected to form a through hole for the push rod to pass through.
[0009] As a preferred solution, there are two power input wires, and the two power input wires are connected to the Hall sensor and the magnetic sensor respectively.
[0010] As a preferred solution, an electromagnetic shielding layer is arranged outside the shell, and the electromagnetic shielding layer is a metal shell coated outside the shell or a coating plated on the outer wall of the shell.
[0011] The beneficial effect of the utility model is as follows: the utility model uses a Hall sensor to detect the position of the speed regulating magnet, which is equivalent to detecting the depth of the user pressing the push rod, and then sends the detected result to the controller of the electrical device in the form of an electrical signal. The controller can control the output power of the electrical device according to the strength of the received electrical signal, such as controlling the output speed of the electric tool, thereby realizing the speed regulation function. The utility model also uses a magnetic sensor to sense the position of the opening and closing magnet, and sends the detection result to the controller of the electrical device in the form of an electrical signal. The controller can close or disconnect the power switch of the load output circuit according to the signal sent by the magnetic sensor. Since the Hall sensor does not need to contact each other when detecting the position of the speed regulating magnet, and no current passes between the two, it will not cause wear and will not generate arcs, and the same is true between the magnetic sensor and the opening and closing magnet. Therefore, the utility model can solve the technical problems that the traditional mechanical contact switch is prone to arcing when opening and closing, affecting the safety of the switch, and the speed regulating carbon film is worn, causing the speed regulation accuracy to decrease, which greatly improves the working safety of the switch and extends the service life of the switch. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:
[0013] Figure 1 It is a three-dimensional exploded view of the switch of the utility model;
[0014] Figure 2 It is a structural schematic diagram of the push rod slider of the utility model;
[0015] Figure 3 It is a three-dimensional exploded view of the housing of the utility model;
[0016] Figure 1~Figure 3 In: 1. Shell, 1a. Base, 1b. Cover, 2. Push rod, 3. Slider, 4. Elastic part, 5. PCB board, 6. Hall sensor, 7. Speed control magnet, 8. Magnetic sensor, 9. Open and close magnet, 10. Assembly hole, 11. Assembly slot, 12. Speed control signal output wire, 13. Power input wire, 14. Open and close signal output wire, 15. Ground wire, 16. Positioning pin, 17. Spring hole, 18. Convex ring, 19. Semicircular groove, 20. Electromagnetic shielding layer. DETAILED DESCRIPTION
[0017] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.
[0018] like Figure 1~Figure 3The contactless signal switch shown includes a shell 1 and a push rod 2 movably plugged into the shell 1. The push rod 2 can slide back and forth along its axial direction. One end of the push rod 2 extends out of the shell 1, and the other end is inserted into the shell 1 and fixedly connected with a slider 3. The slider 3 is slidably connected to the inner wall of the shell 1 and the sliding direction is parallel to the axial direction of the push rod 2. The slider 3 is elastically connected to the shell 1 through an elastic member 4. When the push rod 2 moves into the shell 1, the elastic member 4 is compressed. When the push rod 2 is released, the elastic member 4 resets and pushes the push rod 2 to move out of the shell 1 and reset. In this embodiment, the elastic member 4 is preferably a coil spring. In actual applications, elastic rubber pads, memory foam, elastic reset films, etc. can also be used as the elastic member 4. A PCB board 5 is also provided in the housing 1, and a Hall sensor 6 is provided on the PCB board 5. A speed regulating magnet 7 corresponding to the Hall sensor 6 is connected to the slider 3. The Hall sensor 6 and the speed regulating magnet 7 are discretely arranged along the sliding direction of the slider 3. The speed regulating magnet 7 moves synchronously with the slider 3. The Hall sensor 6 detects the position of the speed regulating magnet 7 and transmits it to the controller of the electrical device (not shown in the figure) in the form of an electrical signal. The controller adjusts the output power according to the received electrical signal. A magnetic sensor 8 is also provided on the PCB board 5. An opening and closing magnet 9 cooperating with the magnetic sensor 8 is connected to the slider 3. The magnetic sensor 8 and the opening and closing magnet 9 are arranged in a direction perpendicular to the axial direction of the push rod 2. When the push rod 2 is not subjected to external force, the slider 3 is in a stationary state under the elastic force of the elastic member 4, and the opening and closing magnet 9 is just opposite to the magnetic sensor 8. The magnetic sensor 8 is used to detect the position of the opening and closing magnet 9 and send a signal of switch opening or closing to the controller. Different from the Hall sensor 6 , the magnetic sensor 8 outputs a switch-off signal when it detects that the switch magnet 9 is within a set range in its circumferential direction, and outputs a switch-off signal when the switch magnet 9 is out of the set range.
[0019] In order to eliminate the influence of the magnetic field of the switching magnet 9 on the Hall sensor 6 , the switching magnet 9 and the Hall sensor 6 are arranged in a staggered manner.
[0020] like Figure 1 As shown, the PCB board 5 in this embodiment is parallel to the axial direction of the push rod 2 and is arranged on one side of the slider 3. A mounting hole 10 extending along the axial direction of the push rod 2 is provided on one side of the slider 3. The speed regulating magnet 7 is installed in the mounting hole 10, so that the speed regulating magnet 7 can synchronize the movement of the push rod 2, so that the Hall sensor 6 can accurately output the moving distance of the push rod 2, and realize the precise speed regulation function. A mounting groove 11 perpendicular to the axial direction of the push rod 2 is provided on the other side of the slider 3, and the opening and closing magnet 9 is embedded in the mounting groove 11. The speed regulating magnet 7 and the opening and closing magnet 9 are controlled simultaneously by the same slider 3, so that the contactless signal switch operation is more convenient.
[0021] As an improvement to the above technical solution, the PCB board 5 in this embodiment is connected with a speed control signal output wire 12, a power input wire 13, an opening and closing signal output wire 14 and a ground wire 15. The speed control signal output wire 12 is electrically connected to the signal output pin of the Hall sensor 6 through the printed circuit on the PCB board 5, and the electrical signal output by the Hall sensor 6 is transmitted to the outside through the speed control signal output wire 12. The power input wire 13 supplies power to the Hall sensor 6 and the magnetic sensor 8 through the printed circuit on the PCB board 5, and the opening and closing signal output wire 14 is electrically connected to the output pin of the magnetic sensor 8 through the printed circuit on the PCB board 5, and the electrical signal output by the magnetic sensor 8 is transmitted to the outside through the opening and closing signal output wire 14. The ground pins of the Hall sensor 6 and the magnetic sensor 8 are both electrically connected to the ground wire 15 through the printed circuit on the PCB board 5.
[0022] In practical applications, two power input wires 13 can also be used to power the Hall sensor 6 and the magnetic sensor 8 respectively, which can improve the working stability of the Hall sensor 6 and the magnetic sensor 8 respectively, and can cut off the power supply circuit of the Hall sensor 6 when the switch is in the off state, thereby avoiding the standby power consumption of the Hall sensor 6.
[0023] In this embodiment, a positioning pin 16 parallel to the sliding direction of the slider is provided in the housing, the elastic member 4 is a pre-compressed coil spring, a spring hole 17 is provided at the end of the slider 3 facing away from the push rod 2, one end of the coil spring is inserted into the spring hole 17, and the other end is sleeved on the positioning pin 16, and a radially outwardly protruding convex ring 18 is provided at the end of the positioning pin 16 away from the slider 3, and the end of the coil spring away from the slider 3 abuts against the convex ring 18. Under the action of the elastic force of the coil spring, the end of the positioning pin 16 away from the slider 3 abuts against the inner wall of the housing 1. The positioning pin 16 is provided to facilitate the working stability of the coil spring as the elastic member 4 and to avoid radial bending of the coil spring. However, the positioning pin 16 is not necessarily provided.
[0024] like Figure 3 As shown, the housing 1 in this embodiment includes a base 1a and a cover 1b connected to each other up and down, and a semicircular groove 19 is respectively opened on the side wall of the base 1a and the cover 1b on the same side, and the two semicircular grooves 19 are connected to form a through hole for the push rod to pass through.
[0025] As a further improvement to the above technical solution, in this embodiment, an electromagnetic shielding layer 20 is further provided on the outside of the housing 1, and the electromagnetic shielding layer is a coating having an electromagnetic shielding effect and coated on the outer wall of the housing 1. In practical applications, a metal shell can also be added to the outside of the housing 1 as the electromagnetic shielding layer 20, or a metal layer can be provided on the outer wall of the housing 1 by insert injection molding.
[0026] The electromagnetic shielding layer 20 can effectively isolate the influence of the induced magnetic field generated by the external circuit of the shell on the Hall sensor 6 in the shell 1, and can also isolate the electromagnetic induction problem of the movement of the speed regulating magnet 7 and the opening and closing magnet 9 inside the shell 1 on the external circuit of the shell 1, thereby avoiding the external circuit from generating induced current due to the movement of the speed regulating magnet 7 and the opening and closing magnet 9.
[0027] The working process of the utility model is: first, the contactless signal switch (referred to as "switch") described in the utility model is connected to the electrical equipment. Taking the electric tool as an example, the switch is connected to the electric tool, so that the Hall sensor 6 and the magnetic sensor 8 are electrically connected to the controller (MCU) of the electric tool respectively to realize signal transmission, and at the same time, the PCB board 5 is powered by the power system of the electric tool, so that the Hall sensor 6 and the magnetic sensor 8 are powered to work. The ground pins of the Hall sensor 6 and the magnetic sensor 8 are connected to the ground wire inside the electric tool, thereby completing the connection of the switch.
[0028] When the switch is not pressed, the switch magnet 9 is directly opposite to the magnetic sensor 8, and the magnetic sensor 8 does not output a signal. When the user presses the push rod 2 of the switch, the slider moves to Figure 1 As shown in the figure, the opening and closing magnet 9 gradually slides away from the magnetic sensor 8. When the opening and closing magnet 9 slides away from the magnetic sensor 8 by a certain distance, the magnetic sensor 8 outputs an electrical signal to the controller of the power tool, and the controller controls the power supply system to supply power to the load after receiving the signal. Conversely, when the opening and closing magnet 9 gradually approaches the magnetic sensor 8 and the distance between the two reaches a predetermined value, the magnetic sensor 8 stops outputting electrical signals to the controller, and the controller controls the power supply system to stop supplying power to the load.
[0029] When the opening and closing magnet 9 moves, the speed regulating magnet 7 also moves, causing the distance between the speed regulating magnet 7 and the Hall sensor 6 to change, resulting in a change in the signal strength output by the Hall sensor 6. The controller controls the output power of the power supply system when supplying power to the load according to the signal strength output by the Hall sensor 6. The deeper the user presses the push rod 2, the higher the output power of the controller when the power supply system supplies power to the load. In this way, contactless speed regulation is achieved.
[0030] The above-mentioned specific working process only illustrates a specific working process by way of example. In actual operation, the working process can be appropriately adjusted according to the working conditions. For example, the power supply circuit of the Hall sensor 6 can be controlled by a controller to cut off the power supply of the Hall sensor 6 when the switch is in the disconnected state, and to turn on the power supply of the Hall sensor 6 when the switch is in the closed state, so as to eliminate the power consumption of the Hall sensor 6 when the switch is in the disconnected state.
[0031] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.
Claims
1. A contactless signal switch, comprising a housing (1), a push rod (2) movably plugged into the housing (1), the push rod (2) being able to slide back and forth along its axial direction, one end of the push rod (2) extending out of the housing (1), the other end being inserted into the housing (1) and fixedly connected with a slider (3), the slider (3) being slidably connected to the inner wall of the housing (1) and the sliding direction being parallel to the axial direction of the push rod (2), the slider (3) being elastically connected to the housing (1) via an elastic member (4), the elastic member (4) being compressed when the push rod (2) moves into the housing (1), and the elastic member (4) being reset when the push rod (2) is released to push the push rod (2) to move out of the housing (1) and reset, characterized in that: A PCB board (5) is also arranged in the housing (1), a Hall sensor (6) is arranged on the PCB board (5), a speed regulating magnet (7) corresponding to the Hall sensor (6) is connected to the slider (3), the Hall sensor (6) and the speed regulating magnet (7) are discretely arranged along the sliding direction of the slider (3), the speed regulating magnet (7) and the slider (3) move synchronously, the Hall sensor (6) detects the position of the speed regulating magnet (7) and sends a signal, a magnetic sensor (8) is also arranged on the PCB board (5), an opening and closing magnet (9) cooperating with the magnetic sensor (8) is connected to the slider (3), the magnetic sensor (8) and the opening and closing magnet (9) are arranged in a direction perpendicular to the axial direction of the push rod (2), the magnetic sensor (8) is used to detect the position of the opening and closing magnet (9), and the opening and closing magnet (9) and the Hall sensor (6) are arranged in a staggered manner.
2. The contactless signal switch according to claim 1, characterized in that: The PCB board (5) is parallel to the axial direction of the push rod (2) and is arranged on one side of the slider (3); one side of the slider (3) is provided with an assembly hole (10) extending along the axial direction of the push rod (2); the speed regulating magnet (7) is installed in the assembly hole (10); the other side of the slider (3) is provided with an assembly groove (11) perpendicular to the axial direction of the push rod (2); the opening and closing magnet (9) is embedded in the assembly groove (11).
3. The contactless signal switch according to claim 1, characterized in that: The PCB board (5) is connected to a speed regulation signal output wire (12), at least one power input wire (13), an opening and closing signal output wire (14) and a ground wire (15); the speed regulation signal output wire (12) is electrically connected to a signal output pin of a Hall sensor (6) via a printed circuit on the PCB board (5); the power input wire (13) supplies power to the Hall sensor (6) and the magnetic sensor (8) via the printed circuit on the PCB board (5); the opening and closing signal output wire (14) is electrically connected to an output pin of the magnetic sensor (8) via the printed circuit on the PCB board (5); and the ground pins of the Hall sensor (6) and the magnetic sensor (8) are both electrically connected to the ground wire (15) via the printed circuit on the PCB board (5).
4. The contactless signal switch according to claim 1, characterized in that: A positioning pin (16) is arranged in the housing and is parallel to the sliding direction of the slider. The elastic member (4) is a pre-compressed coil spring. A spring hole (17) is provided at one end of the slider (3) facing away from the push rod (2). One end of the coil spring is inserted into the spring hole (17), and the other end is sleeved on the positioning pin (16). A radially outwardly protruding convex ring (18) is arranged at one end of the positioning pin (16) away from the slider (3). The end of the coil spring away from the slider (3) abuts against the convex ring (18). Under the action of the elastic force of the coil spring, the end of the positioning pin (16) away from the slider (3) abuts against the inner wall of the housing (1).
5. The contactless signal switch according to claim 1, characterized in that: The housing (1) comprises a base (1a) and a cover (1b) connected to each other in an upper and lower manner. A semicircular groove (19) is respectively provided on the side walls on the same side of the base (1a) and the cover (1b). The two semicircular grooves (19) are butted together to form a through hole for the push rod to pass through.
6. The contactless signal switch according to claim 3, characterized in that: There are two power input wires (13), and the two power input wires (13) are connected to the Hall sensor (6) and the magnetic sensor (8) respectively.
7. The contactless signal switch according to any one of claims 1 to 6, characterized in that: An electromagnetic shielding layer (20) is provided outside the shell (1), and the electromagnetic shielding layer is a metal shell coated outside the shell (1) or a coating plated on the outer wall of the shell.