Trigger switch for direct current signal and on-off large current based on Hall signal control

Abstract

The utility model discloses a direct current signal and large current on-off trigger switch based on Hall signal control, which relates to the technical field of trigger switches, and comprises a base body, an upper cover and a push shaft, one end of the push shaft is arranged in a box body formed by the base body and the upper cover, and the other end of the push shaft extends out of the box body; a push shaft is arranged on the base body, a movable contact arm is arranged below the push shaft, a movable contact arm support and a first static contact pin are arranged below the movable contact arm, the movable contact arm is arranged on the movable contact arm support, and the movable contact arm support and the first static contact pin are both fixed on the base body; the utility model has the advantages of stable contact, wear resistance, main current control and no need of software evaluation, so that the speed regulation is firmer when the electric tool vibrates in use, the instant disconnection is reduced by large-current contact control, and the service life is prolonged. And therefore, the situations of unstable work of the electric tool, jumping of the speed of the electric tool and poor contact of a main control contact of the electric tool caused by instantaneous disconnection are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of trigger switches, in particular to a trigger switch which is based on a direct current signal controlled by a Hall signal and switches a large current. Background Art

[0002] Currently, the DC trigger switches of this type on the market generally realize the control of electronic signals through mechanical structures such as reed contact and circuit board contact, contact point contact, etc., which have the following defects: 1. The mechanical contact is unstable, so that when the power tool is used and vibrates, the mechanical contact is not reliable and there is a momentary disconnection phenomenon, causing unstable operation of the power tool; 2. The reversing mechanical contact is worn and disconnected instantly, which will cause the direction of the power tool to reverse, causing harm to the human body; 3. When the speed regulation mechanical contact is disconnected instantly or the circuit board is severely worn, it will cause the speed of the power tool to jump and become unstable; 4. When the mechanical contact of the switch is not good, it will cause the power tool to stop instantly or the speed to be unstable; the mechanical contact life is relatively short, and current users have increasingly higher requirements for the service life cycle of power tools. Mechanical wear can no longer meet the current market's increasing demand for power tools.

[0003] Therefore, the existing technology cannot meet the current market's increasing demand for power tools. To this end, research on a trigger switch that combines a DC signal controlled by a Hall signal with a fast on-off DC high voltage and large current is imperative.

[0004] In view of this, there is an urgent need for a trigger switch based on a DC signal controlled by a Hall signal and capable of switching large currents. Utility Model Content

[0005] In view of the problems existing in the prior art, the present invention solves the problem with the following technical structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A trigger switch for switching high currents and direct currents based on Hall signal control includes a base, an upper cover, and a push shaft. One end of the push shaft is disposed within a housing formed by the base and the upper cover, and the other end extends out of the housing.

[0008] A moving contact arm is provided below the push shaft, and a moving contact arm bracket and a first static contact foot are provided below the moving contact arm, the moving contact arm is provided on the moving contact arm bracket, and the moving contact arm bracket and the first static contact foot are both fixed on the base body; a swinging sub-spring is provided at the bottom of the push shaft, and a swinging sub-spring is provided at one end away from the push shaft, and the swinging sub-spring rests on the top of the moving contact arm; a bend is provided on the moving contact arm, and a protrusion matching the bend is provided on the moving contact arm bracket, and the moving contact arm can rotate with the protrusion as a fulcrum; a first moving contact is provided on the end of the moving contact arm matching the first static contact foot, and a static contact matching the first moving contact is provided on the first static contact foot.

[0009] It is further characterized in that

[0010] A circuit board assembly is provided on one side of the push shaft, a speed regulation Hall element is provided on the side of the circuit board assembly close to the push shaft, and a speed regulation magnet group cooperating with the speed regulation Hall element is provided on the side of the push shaft close to the circuit board assembly.

[0011] A reversing lever is provided above the push shaft, and a reversing spring is provided at one end of the reversing lever;

[0012] A commutation Hall element is provided on the side of the circuit board assembly away from the push shaft, and a commutation magnet is provided on the side of the commutation lever close to the circuit board assembly.

[0013] A V-shaped groove is provided on the reversing spring piece, and a protrusion that matches the V-shaped groove is provided at one end of the reversing lever.

[0014] A circular groove is provided on one side of the reversing lever close to the circuit board assembly, and the reversing magnet is provided in the circular groove.

[0015] The speed regulating magnet group includes a first speed regulating magnet and a second speed regulating magnet with different polarities. Two first rectangular grooves are provided on a side of the push shaft close to the circuit board assembly. The first speed regulating magnet and the second speed regulating magnet are respectively disposed in the two first rectangular grooves.

[0016] A slide groove is provided on one side of the two first rectangular grooves, and the speed regulation Hall element moves relatively in the slide groove.

[0017] One end of the push shaft extending out of the box body is provided with a trigger.

[0018] One end of the push shaft is away from the trigger and resets the spring.

[0019] A positioning column is provided at one end of the push shaft away from the trigger, and the return spring is sleeved on the positioning column.

[0020] An inner sealing ring and an outer sealing ring are provided at the position where the push shaft extends out of the box body.

[0021] The above structure of the utility model can achieve the following beneficial effects:

[0022] The trigger switch provided by the utility model has protrusions on both sides of the movable contact arm bracket against the bend of the movable contact arm, so that the movable contact arm can rotate with the protrusions on the movable contact arm bracket as a fulcrum; and under the action of the swing sub-spring, the movable contact arm is closely in contact with the movable contact arm bracket, so that it is not easy to heat up, and the switch is turned on and off stably;

[0023] The trigger switch provided by the utility model has a signal on-off function. When the switch trigger is released, the circuit board is completely de-energized, so that the leakage current of the power tool battery is zero, which can effectively extend the battery life and reduce the risk caused by excessive battery discharge, meeting the national safety standards.

[0024] The trigger switch provided by the utility model can not only realize the functions of turning the power tool on and off, regulating speed and voltage, but also realize the reversing function of the power tool. All of these functions are controlled by electronic signals. The switch has excellent on and off performance, making the power tool durable and meeting national safety standards.

[0025] The utility model has stable contact, wear resistance, main current control, and does not require software evaluation, so that the speed regulation is more reliable when the power tool is used with vibration. The large current contact control reduces the occurrence of instantaneous disconnection, thereby reducing the unstable operation of the power tool caused by instantaneous disconnection, the jump of the power tool speed, and the poor contact of the main control contacts of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of this application;

[0027] Figure 2 This is a schematic diagram of the structure inside the box of this application;

[0028] Figure 3 This is a schematic diagram of the structure explosion of this application;

[0029] Figure 4 This is a schematic diagram of the structure when the switch is disconnected in this application;

[0030] Figure 5 This is a schematic diagram of the structure when the switch is turned on in this application;

[0031] Figure 6 This is a structural diagram of the push shaft in the initial state in this application;

[0032] Figure 7 This is a structural diagram of the push shaft in the operating state in this application;

[0033] Figure 8 This is a structural diagram of the reversing lever in the present application in its initial state;

[0034] Figure 9 This is a structural diagram of the reversing lever in the present application in the operating state.

[0035] In the figure: 1. base body; 2. upper cover; 3. push shaft; 31. first rectangular groove; 32. slide groove; 4. return spring; 5. moving contact arm; 51. bend; 52. first moving contact; 6. moving contact arm bracket; 61. protrusion; 7. first static contact foot; 71. static contact; 8. swing member; 9. swing member spring; 10. trigger; 11. circuit board assembly; 12. Hall element for speed regulation; 13. magnet group for speed regulation; 131. first magnet for speed regulation; 132. second magnet for speed regulation; 14. reversing lever; 141. circular groove; 142. protrusion; 15. reversing spring; 16. Hall element for reversing; 17. reversing magnet; 18. positioning column; 19. inner sealing ring; 20. outer sealing ring. DETAILED DESCRIPTION

[0036] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0038] The following is combined with Figures 1-9 This application is described in further detail.

[0039] refer to Figure 1-Figure 3The trigger switch shown in the figure, which is based on a Hall signal-controlled DC signal and switches large currents, includes a base body 1, an upper cover 2 and a push shaft 3. One end of the push shaft 3 is arranged in a box body formed by the base body 1 and the upper cover 2, and the other end extends out of the box body. In order to facilitate the operation of the push shaft 3, a trigger 10 is provided at the end of the push shaft 3 extending out of the box body, and a reset spring 4 is provided at the end of the push shaft 3 away from the trigger 10. A positioning column 18 is provided at the end of the push shaft 3 away from the trigger 10, and the reset spring 4 is sleeved on the positioning column 18. In this way, by pressing the trigger 10, the push shaft 3 can be easily pushed into the box body. The design of the reset spring 4 makes the reset spring 4 be compressed when the push shaft 3 moves into the box body. When the trigger 10 is released, the elastic force of the reset spring 4 resets the push shaft 3.

[0040] refer to Figure 3 and Figure 5 As shown, a movable contact arm 5 is provided below the push shaft 3, and a movable contact arm bracket 6 and a first static contact foot 7 are provided below the movable contact arm 5. The movable contact arm 5 is provided on the movable contact arm bracket 6, and the movable contact arm bracket 6 and the first static contact foot 7 are both fixed to the base body 1; a swing sub-spring 9 is provided at the bottom of the push shaft 3, and a swing sub-spring 9 is provided with a swing sub-spring 8 at one end away from the push shaft 3, and the swing sub-spring 9 rests on the top of the movable contact arm 5; a bend 51 is provided on the movable contact arm 5, and a protrusion 61 that cooperates with the bend 51 is provided on the movable contact arm bracket 6, and the movable contact arm 5 can rotate with the protrusion 61 as a fulcrum; a protrusion 61 that cooperates with the first static contact foot 7 on the movable contact arm 5 A first moving contact 52 is provided at the end, and a static contact 71 adapted to the first moving contact 52 is provided on the first static contact foot 7. In this way, when in use, the push shaft 3 moves relative to the box body, and the protrusions 61 on both sides of the movable contact arm bracket 6 are pressed against the bend 51 of the movable contact arm 5, so that the movable contact arm 5 can rotate with the protrusion 61 on the movable contact arm bracket 6 as a fulcrum; and under the action of the swing sub-spring 9, the movable contact arm 5 is closely contacted with the movable contact arm bracket 61, so that it is not easy to heat up, making the switch on and off very crisp, with excellent on and off performance, making the power tool durable. For example, when the trigger 10 is pressed, Figure 5As shown, the push shaft 3 moves to the left under the drive of the trigger 10, so as to drive the swing member 8 and the swing member spring 9 provided on the push shaft 3 to move from right to left. When the swing member 8 passes the highest point in the middle of the movable contact arm 5, the swing member spring 9 is severely squeezed and suddenly released, thereby driving the movable contact arm to rotate with the mating part of the protrusion on the movable contact arm 5 and the protrusion on the movable contact arm bracket as the fulcrum, so that the movable contact arm 5 jumps rapidly in the clockwise direction under the action of the swing member spring 9, thereby making the first movable contact 52 on the movable contact arm 5 and the second movable contact 53 on the movable contact arm 5 move in a clockwise direction. The static contact 71 on the first static contact foot 7 makes quick contact, realizing the quick connection function of the switch. When the trigger 10 is released, the push shaft 3 is gradually reset under the action of the reset spring 4, and the swing member 8 and the swing member spring 9 on the push shaft 3 move to the right as the push shaft 3 is reset. When the swing member 8 passes the highest point in the middle of the moving contact arm 5, the swing member spring 9 is severely squeezed and suddenly released, thereby driving the moving contact 24 on the moving contact arm 5 to quickly separate from the static contact 25 on the first static contact foot 6, realizing the quick disconnection function of the switch.

[0041] refer to Figure 3-Figure 7 As shown, a circuit board assembly 11 is provided on one side of the push shaft 3, a speed regulating Hall element 12 is provided on the side of the circuit board assembly 11 close to the push shaft 3, a speed regulating magnet group 13 is provided on the side of the push shaft 3 close to the circuit board assembly 11, and the speed regulating magnet group 13 includes a first speed regulating magnet 131 and a second speed regulating magnet 132 with different polarities, and two first rectangular grooves 31 are provided on the side of the push shaft 3 close to the circuit board assembly 11, and the first speed regulating magnet 131 and the second speed regulating magnet 132 are respectively arranged in the two first rectangular grooves 31; a slide groove 32 is provided on one side of the two first rectangular grooves 31, and the speed regulating Hall element 12 moves relatively in the slide groove 32, so that when the trigger 1 is engaged, the first magnet 131 and the second magnet 132 are engaged. When the trigger 10 is in a free state, the first speed regulating magnet 131 and the second speed regulating magnet 132 are respectively located on one side of the speed regulating Hall element 12, wherein the second speed regulating magnet 132 is close to the speed regulating Hall element 12, and the first speed regulating magnet 131 is away from the speed regulating Hall element 12; when the trigger 10 is pressed, the second speed regulating magnet 132 and the push shaft 3 move linearly together. During the movement, the distance between the first speed regulating magnet 131 and the speed regulating Hall element 12 gradually decreases, and the distance between the second speed regulating magnet 132 and the speed regulating Hall element gradually increases; until the trigger 14 is fully pressed to the maximum stroke, during this process, the signal of the speed regulating Hall element 12 gradually changes, thereby realizing the speed regulation function of the switch.

[0042] refer to Figure 3 、 Figure 8 and Figure 9As shown, a reversing lever 14 is provided above the push shaft 3, and a reversing spring 15 is provided at one end of the reversing lever 14; a V-shaped groove is provided on the reversing spring 15, and a protrusion 142 that cooperates with the V-shaped groove is provided at one end of the reversing lever 14 to improve the stability of the connection between the reversing lever 14 and the reversing spring 15. A reversing Hall element 16 is provided on the side of the circuit board assembly 11 away from the push shaft 3, a reversing magnet 17 is provided on the side of the reversing lever 14 close to the circuit board assembly 11, and a circular groove 141 is provided on the side of the reversing lever 14 close to the circuit board assembly 11. The magnet 17 is arranged in the circular groove 141. In this way, when the reversing lever 14 is in the initial state, the commutation Hall element 16 is located in the middle and lower part of the commutation magnet 17; when the reversing lever 14 is moved in the forward direction, the position of the commutation magnet 17 arranged on the reversing lever 14 relative to the commutation Hall element 16 changes, and cooperates with the commutation Hall element 16 to realize the conversion of the Hall signal; when the reversing lever 16 is moved in the reverse direction, the commutation Hall element 16 is located in the middle and lower part of the reversing lever magnet 17, so that the reversing function of the switch can be realized without the conversion of the Hall signal.

[0043] Further optimization is that, in order to improve the sealing performance inside the box and prevent foreign matter from entering the box, an inner sealing ring 19 and an outer sealing ring 20 are provided at the position where the push shaft 3 extends out of the box.

[0044] In summary, the present invention has stable and wear-resistant contacts, and the main current control does not require software evaluation, making the speed regulation more reliable when the power tool is in vibration. The high-current contact control reduces the occurrence of instantaneous disconnection, thereby reducing the unstable operation of the power tool, the jump in the speed of the power tool, and the poor contact of the main control contacts of the power tool caused by instantaneous disconnection.

[0045] In addition, in the existing mechanical contact, the reed contacts the copper foil of the circuit board, so the current output can only be within 1A. When used in high-current power tools such as electric chain saws, electric circular saws, profile cutting machines and aluminum saws, the current output must be at least 50A or higher. Therefore, the existing technology cannot meet the use requirements. The present application contacts the first moving contact 52 with the static contact 71, so that a larger current can be output to meet the current output of at least 50A or higher, thereby achieving freedom from the software evaluation risk of the original signal control. Therefore, the operation can be achieved using a mechanical structure without the need to use software to control the risk.

[0046] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. A trigger switch based on a DC signal controlled by a Hall signal and capable of switching large currents, characterized in that: It comprises a base body (1), an upper cover (2) and a push shaft (3), wherein one end of the push shaft (3) is arranged in a box body formed by the base body (1) and the upper cover (2), and the other end extends out of the box body; A movable contact arm (5) is provided below the push shaft (3), a movable contact arm bracket (6) and a first static contact foot (7) are provided below the movable contact arm (5), the movable contact arm (5) is provided on the movable contact arm bracket (6), and the movable contact arm bracket (6) and the first static contact foot (7) are both fixed on the base body (1); a swinging sub-spring (9) is provided at the bottom of the push shaft (3), a swinging sub-spring (9) is provided at one end away from the push shaft (3), and the swinging sub-spring (9) is provided with a swinging sub-spring (8). (8) rests against the top of the movable contact arm (5); a bend (51) is provided on the movable contact arm (5), a protrusion (61) that matches the bend (51) is provided on the movable contact arm bracket (6), and the movable contact arm (5) can rotate with the protrusion (61) as a fulcrum; a first movable contact (52) is provided on one end of the movable contact arm (5) that matches the first static contact foot (7), and a static contact (71) that matches the first movable contact (52) is provided on the first static contact foot (7).

2. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 1, characterized in that: A circuit board assembly (11) is provided on one side of the push shaft (3); a speed regulating Hall element (12) is provided on the side of the circuit board assembly (11) close to the push shaft (3); and a speed regulating magnet group (13) cooperating with the speed regulating Hall element (12) is provided on the side of the push shaft (3) close to the circuit board assembly (11).

3. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 2, characterized in that: A reversing lever (14) is provided above the push shaft (3), and a reversing spring (15) is provided at one end of the reversing lever (14); A commutation Hall element (16) is provided on the side of the circuit board assembly (11) away from the push shaft (3), and a commutation magnet (17) is provided on the side of the commutation lever (14) close to the circuit board assembly (11).

4. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 3, characterized in that: A V-shaped groove is provided on the reversing spring piece (15), and a protrusion (142) that matches the V-shaped groove is provided on one end of the reversing lever (14).

5. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 4, characterized in that: A circular groove (141) is provided on the side of the reversing lever (14) close to the circuit board assembly (11), and the reversing magnet (17) is arranged in the circular groove (141).

6. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 2, characterized in that: The speed regulating magnet group (13) comprises a first speed regulating magnet (131) and a second speed regulating magnet (132) having different polarities; two first rectangular slots (31) are provided on a side of the push shaft (3) close to the circuit board assembly (11); the first speed regulating magnet (131) and the second speed regulating magnet (132) are respectively provided in the two first rectangular slots (31); A slide groove (32) is provided on one side of the two first rectangular grooves (31), and the speed regulating Hall element (12) moves relatively in the slide groove (32).

7. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 1, characterized in that: A trigger (10) is provided at one end of the push shaft (3) extending out of the box body.

8. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 7, characterized in that: The push shaft (3) has a return spring (4) at one end away from the trigger (10).

9. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 8, characterized in that: A positioning column (18) is provided at one end of the push shaft (3) away from the trigger (10), and the return spring (4) is sleeved on the positioning column (18).

10. The trigger switch for switching large currents based on a DC signal controlled by a Hall signal according to claim 1, characterized in that: An inner sealing ring (19) and an outer sealing ring (20) are provided at the position where the push shaft (3) extends out of the box body.

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