CN219626500U

CN219626500U - Mini DC speed regulating switch

Info

Publication number: CN219626500U
Application number: CN202320553311.5U
Authority: CN
Inventors: 倪圣珑; 朱寿富; 薛垒垒
Original assignee: Zhejiang Jiaben Electronics Co ltd
Current assignee: Zhejiang Jiaben Electronics Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-09-01
Anticipated expiration: 2033-03-15

Abstract

The miniature direct current speed regulation switch comprises a base body, a lower cover, an upper cover and a push shaft, wherein one end of the push shaft is arranged in a box body formed by the base body and the lower cover, and the other end extends out of the box body; a movable contact assembly contacted with the push shaft and a movable contact bracket supporting the movable contact assembly are arranged above the push shaft, and a movable contact spring sheet group is arranged between the movable contact assembly and the movable contact bracket; a static contact pin assembly and an output pin are arranged above the moving contact pin assembly, and an input pin is arranged on one side of the push shaft; the movable contact assembly comprises a movable contact group and a movable contact group arranged on the movable contact group, and the static contact pin assembly comprises a static contact pin and a static contact group arranged on the static contact pin. The lower part of the pushing shaft is provided with a circuit board assembly, the circuit board assembly is provided with a control circuit and a programming interface, the programming interface extends out of the lower part of the base body circuit board assembly and is provided with an MOS tube, and the MOS tube, the moving contact support, the static contact pin, the output pin and the input pin are respectively connected with the circuit board assembly.

Description

Mini DC speed regulating switch

Technical Field

The present disclosure relates to speed regulating switches, and more particularly to a miniature dc speed regulating switch.

Background

The direct current speed regulation switch in the current market has larger size and mainly has the following defects:

1. the existing direct current speed regulating switch is large in size, so that the handle of the electric tool is required to be designed thicker, the problem that the user is easy to fatigue is caused by thicker handle, and when the user works at high altitude, the danger that the electric tool falls off if the user is tired is easy to occur, and the requirement of national safety standard is not met.

2. The radiating fins of the existing direct current speed regulating switch are designed on two sides of the switch, the radiating fins are tightly attached to the handle of the electric tool, when a user works for a long time, the continuous heating of the switch can be transmitted to the hand of the user, and when the user reaches a higher temperature, the user can release the electric tool due to self-protection, so that the electric tool falls off danger can occur, and the requirements of national safety standards are not met.

Therefore, it is imperative to design a miniature DC speed regulating switch.

Disclosure of Invention

The switch in the present disclosure aims to overcome the defects of the prior art and provide a mini-type direct current speed regulation switch.

The technical scheme of the miniature direct current speed regulation switch in the present disclosure is: the novel multifunctional box comprises a base body, a lower cover, an upper cover and a pushing shaft, wherein one end of the pushing shaft is arranged in a box body formed by the base body and the lower cover, and the other end of the pushing shaft extends out of the box body;

a movable contact assembly in contact with the push shaft and a movable contact bracket supporting the movable contact assembly are arranged above the push shaft, a movable contact spring sheet group is arranged between the movable contact assembly and the movable contact bracket, a static contact pin assembly and an output pin are arranged above the movable contact assembly, and an input pin is arranged on one side of the push shaft; the movable contact assembly comprises a movable contact group and a movable contact group arranged on the movable contact group, and the static contact pin assembly comprises a static contact pin and a static contact group arranged on the static contact pin;

the circuit board assembly is arranged below the pushing shaft, the control circuit and the programming interface are arranged on the circuit board assembly, the programming interface extends out of the base body, the MOS tube is arranged below the circuit board assembly, and the MOS tube, the moving contact support, the static contact pin, the output pin and the input pin are respectively connected with the circuit board assembly.

The miniature direct current speed regulation switch in the present disclosure further comprises the following auxiliary technical schemes:

in one embodiment, the control circuit comprises an electronic speed regulating circuit, a battery over-temperature protection circuit, a motor over-current protection circuit, an under-voltage protection circuit and an electric quantity display circuit;

and the circuit board is integrated with a capacitor, a resistor, an inductor, a thermistor, an LED output and control integrated chip.

In one embodiment, a fixing block for fixing the MOS tube is arranged between the circuit board assembly and the MOS tube, the top of the fixing block is connected with the circuit board assembly, and the bottom of the fixing block is connected with the lower cover;

and a heat-conducting silicone grease layer is smeared on one side of the MOS tube, which is close to the heat-radiating fin.

In one embodiment, a reversing assembly is arranged above the base body;

the reversing assembly comprises a reversing turntable, a reversing movable contact group arranged at the bottom of the reversing turntable, and a welding sheet group and an output terminal group which are arranged below the reversing movable contact group, wherein the welding sheet group is connected with the static contact pin and the output pin;

the reversing turntable is characterized in that a through hole is formed in the side face of the reversing turntable, a steel ball spring is arranged in the through hole, steel balls are arranged at two ends of the steel ball spring, an upper cover groove is formed in the inner side of the upper cover, and the steel balls can jump in the upper cover groove.

In one embodiment, the switch further comprises a diode disposed on the base body, one end of the diode is connected to the output pin, and the other end of the diode is connected to the static contact pin.

In one embodiment, a connecting block is arranged at the top of the fixed block, and a connecting hole matched with the connecting block is arranged on the circuit board; the bottom of the fixed block is provided with a connecting column, the MOS tube is provided with a connecting plate, the connecting plate is provided with a mounting hole, and the connecting column penetrates through the mounting hole to fix the MOS tube on the fixed block;

the connecting column is provided with a connecting column through hole, the lower cover is provided with a lower cover through hole, the radiating fin is provided with a radiating fin through hole, and the fastener sequentially penetrates through the radiating fin through hole, the lower cover through hole and the connecting column through hole to fix the radiating fin on the lower cover and the fixing block.

In one embodiment, a speed regulating reed is arranged at the bottom of the pushing shaft, and the speed regulating reed can slide on the surface of the circuit board assembly under the driving of the pushing shaft.

In one embodiment, one end of the movable contact group is provided with a movable contact bending group, and the push shaft is provided with a push shaft clamping block group matched with the movable contact bending group;

the middle part of the moving contact group is provided with a moving contact clamping groove group, the moving contact bracket is provided with a bracket groove group matched with the moving contact clamping groove group, and the moving contact group can rotate by taking the bracket groove group as a fulcrum;

the movable contact support is provided with a support clamping hole group, the movable contact group is provided with a movable contact clamping hole group, one end of the movable contact spring sheet group is arranged in the support clamping hole group, and the other end of the movable contact spring sheet group is arranged in the movable contact clamping hole group;

the upper cover is provided with an arc hole, the top of the reversing turntable is provided with a reversing handle, and the reversing handle extends out of the upper cover through the arc hole and can rotate in the arc hole so as to drive the reversing movable contact group arranged in the reversing turntable to rotate.

In one embodiment, the switch further comprises a return inner spring, a return outer spring, a positioning post, a sealing ring and a trigger;

one end of the push shaft, which is arranged in the box body, is provided with a push shaft hole, a brake block is arranged in the push shaft hole, one end of the reset inner spring is inserted into the reset outer spring, the other end of the reset inner spring is propped against the brake block, one end of the reset outer spring is arranged in the push shaft hole, and the other end of the reset outer spring is arranged on the positioning column;

the base body is provided with a base body semicircular groove, the lower cover is provided with a lower cover semicircular groove, and the sealing ring is arranged in a circular groove formed by the base body semicircular groove and the lower cover semicircular groove;

the trigger is arranged on the pushing shaft and extends out of one end of the box body.

In one embodiment, a push shaft groove is formed in one side, close to the circuit board assembly, of the push shaft, a fixed column is arranged in the push shaft groove, and the speed regulating reed is arranged in the push shaft groove and fixed on the fixed column;

the base body is provided with a first base body strip-shaped hole, a second base body strip-shaped hole, a third base body strip-shaped hole and a fourth base body strip-shaped hole, one end of the static contact pin extends out of the base body through the first base body strip-shaped hole, and the other end of the static contact pin is clamped on the base body through the second base body strip-shaped hole; one end of the output pin extends out of the base body through the third strip-shaped hole of the base body, and the other end of the output pin is clamped on the base body through the fourth strip-shaped hole of the base body;

the movable contact support extends out of the box body through the first strip-shaped hole of the lower cover, and the input pin extends out of the box body through the second strip-shaped hole of the lower cover.

The implementation of the switch in the present disclosure includes the following technical effects:

1. the miniature direct current speed regulation switch concentrates the intelligent speed regulation function and the protection control function on the circuit board inside the switch, so that the assembly process of the electric tool becomes very simple, and the switch software can be changed at any time to realize different functions.

2. The direct-current integrated speed regulation switch does not need to be externally connected with other control boards, so that the wiring inside the electric tool is very few, only 2 input wires and 2 output wires are needed, and additionally 1 battery temperature detection line, LED and other output lines are added, so that the assembly process of the electric tool is greatly simplified. In addition, the programming interface in the present disclosure is also exposed to the switch, and after the plug is plugged, the program in the switch can be read, changed, etc. at any time, so that the program in the switch is very convenient to modify and read.

3. The miniature direct current speed regulating switch has a small and exquisite appearance, can design the handle of the electric tool to be very thin, and can greatly improve the grasping force of hands without easy fatigue.

4. The switch disclosed by the utility model is novel in structure and high in integration level, and can be widely applied to various direct-current charging type electric tools such as direct-current charging type electric drills, direct-current charging type electric hammers and the like, and the switch meets the national safety standard.

Drawings

Fig. 1 is a perspective view of a miniature dc speed regulating switch of the present disclosure.

Fig. 2 is a rear perspective view of the miniature dc speed regulating switch of the present disclosure.

Fig. 3 is a cross-sectional view of the main body of the miniature dc speed regulating switch of the present disclosure.

Fig. 4 is a cross-sectional view of the back of the main body of the miniature dc speed regulating switch of the present disclosure.

Fig. 5 is an exploded view of the miniature dc speed regulating switch of the present disclosure.

Fig. 6 is an assembly view of a main body assembly of the miniature dc speed regulating switch of the present disclosure.

Fig. 7 is an assembled schematic diagram of a push shaft assembly of a miniature dc speed regulating switch of the present disclosure.

Fig. 8 is a front view of a circuit board assembly of the miniature dc speed regulating switch of the present disclosure.

Fig. 9 is a front screen printing view of a circuit board assembly of the miniature dc speed regulating switch of the present disclosure.

Fig. 10 is a back side circuit diagram of a circuit board assembly of the miniature dc speed regulating switch of the present disclosure.

Fig. 11 is a rear screen printing view of a circuit board assembly of the miniature dc speed regulating switch of the present disclosure.

Fig. 12 is a schematic circuit diagram of a miniature dc speed regulating switch of the present disclosure.

Fig. 13 is a circuit functional diagram of a miniature dc speed regulating switch of the present disclosure.

In the figure, a 1-base body, a 2-lower cover, a 3-upper cover, a 4-push shaft, a 5-movable contact assembly, a 6-movable contact support, a 7-movable contact spring sheet group, an 8-static contact pin assembly, a 9-output pin, a 10-input pin, an 11-circuit board assembly, a 12-programming interface, a 13-MOS tube, a 14-fixed block, a 15-radiating fin, a 16-fastener, a 17-reversing assembly, a 18-diode, a 19-speed regulating reed, a 20-reset inner spring, a 21-reset outer spring, a 22-positioning column, a 23-sealing ring, a 24-trigger, a 25-brake block, a 41-push shaft groove, a 42-push shaft clamping block group, a 411-fixed column, a 51-movable contact group, a 52-movable contact group and a 511-movable contact bending group, 512-moving contact clamping groove group, 513-moving contact clamping hole group, 61-bracket groove group, 62-bracket clamping hole group, 81-static contact pin, 82-static contact group, 111-connecting hole, 131-connecting plate, 132-mounting hole, 141-connecting block, 142-connecting column, 171-reversing turntable, 172-reversing moving contact group, 173-welding piece group, 174-output terminal group, 175-steel ball spring, 176-steel ball, 177-reversing spring group, 1711-through hole, 1712-reversing handle, 101-base semicircular groove, 102-base first bar hole, 103-base second bar hole, 104-base third bar hole, 105-base fourth bar hole, 106-wedge blocks, 201-lower cover semicircular grooves, 202-lower cover first strip-shaped holes, 203-lower cover second strip-shaped holes, 204-rectangular holes and 301-arc-shaped holes.

Detailed Description

The switch in the present disclosure will be described in detail below with reference to the embodiments and the accompanying drawings, and it should be noted that the described embodiments are only intended to facilitate understanding of the switch in the present disclosure, and are not meant to be limiting.

The orientation of the present utility model is described above, below, left and right by referring to the drawings, and is not limited to the protection scope.

The miniature direct current speed regulation switch in the disclosure, as shown in fig. 1-5, comprises a base body 1, a lower cover 2, an upper cover 3 and a push shaft 4, wherein one end of the push shaft 4 is arranged in a box body formed by the base body 1 and the lower cover 2, and the other end extends out of the box body;

a moving contact assembly 5 in contact with the pushing shaft 4 and a moving contact support 6 supporting the moving contact assembly 5 are arranged above the pushing shaft 4, a moving contact spring piece group 7 is arranged between the moving contact assembly 5 and the moving contact support 5, one end of the moving contact spring piece group 7 is connected with the moving contact support 5, and the other end is connected with the moving contact support 6; a static contact pin assembly 8 and an output pin 9 are arranged above the movable contact assembly 5, and an input pin 10 is arranged on one side of the push shaft 4;

the lower part of the push shaft 4 is provided with a circuit board assembly 11, the circuit board assembly 11 is provided with a control circuit and a programming interface 12, the programming interface 12 extends out of the base body 1, the lower part of the circuit board assembly 11 is provided with a MOS tube 13, and the MOS tube 13, the moving contact support 6, the static contact pin 8, the output pin 9 and the input pin 10 are respectively connected with the circuit board assembly 11. It will be appreciated that the programming interface 12 may also be referred to as a quick connect terminal receptacle.

As shown in fig. 5, the moving contact assembly 5 includes a moving contact group 51 and a moving contact group 52 disposed on the moving contact group 51, and the stationary contact pin assembly 8 includes a stationary contact pin 81 and a stationary contact group 82 disposed on the stationary contact pin 81.

In this embodiment, the moving contact support 6, the input pin 10, the stationary contact pin and the output pin 9 are provided with protrusions, and the moving contact support 6, the input pin 10, the stationary contact pin 81 and the output pin 9 are respectively welded to the corresponding different welding points on the circuit board assembly 11 through the protrusions.

In the embodiment, the control circuit is arranged on the circuit board, so that the switch in the embodiment does not need to be externally connected with other control boards, the wiring inside the electric tool is very few, and only 2 input wires, 2 output wires, 1 battery temperature detection wire, an LED and other output wires are needed, and the assembly process of the electric tool is greatly simplified; the programming interface 12 is arranged on the circuit board, and the programming interface 12 extends out of the base body 1, so that operations such as reading, changing and the like can be performed on the internal program of the switch by plugging a matched plug on the programming interface 12, and the internal program of the switch is convenient to modify and read.

Specifically, as shown in fig. 8-12, the control circuit includes an electronic speed regulating circuit, a battery over-temperature protection circuit, a motor over-current protection circuit, an under-voltage protection circuit and an electric quantity display circuit, wherein the electronic speed regulating circuit is used for realizing the speed regulating function of the switch, the battery over-temperature protection circuit is used for realizing the over-temperature protection of the battery, the motor over-current protection circuit is used for carrying out over-current protection on the motor, the under-voltage protection circuit is used for realizing the under-voltage protection of the switch, and the electric quantity display circuit is used for realizing the electric quantity display of the battery;

the circuit board is integrated with a capacitor, a resistor, an inductor, a thermistor, an LED output and control integrated chip, and the capacitor, the resistor, the inductor, the thermistor, the LED output and control integrated chip is used for forming an electronic speed regulating circuit, a battery over-temperature protection circuit, a motor over-current protection circuit, an under-voltage protection circuit and an electric quantity display circuit.

As shown in fig. 5-7, a fixing block 14 for fixing the MOS tube 13 is arranged between the circuit board assembly 11 and the MOS tube 13, the top of the fixing block 14 is connected with the circuit board assembly 11, and the bottom of the fixing block 14 is connected with the lower cover 2;

the cooling fin 15 contacting with the MOS tube 13 is arranged below the MOS tube 13, and a heat conduction silicone grease layer is smeared on one side of the MOS tube 13 close to the cooling fin 15.

Specifically, as shown in fig. 5, a connection block 141 may be provided on the top of the fixed block 14, and a connection hole 111 to be fitted with the connection block 141 may be provided on the circuit board, preferably, two connection blocks 141 may be provided on the top of the fixed block 14, and two connection holes 111 to be fitted with the connection blocks 141 may be provided on the circuit board at the same time to connect the fixed block 14 to the circuit board; meanwhile, a connecting column 142 is arranged at the bottom of the fixed block 14, a connecting plate 131 is arranged on the MOS tube 13, and a mounting hole 132 is arranged on the connecting plate 131, wherein the connecting column 142 penetrates through the mounting hole 132 to fix the MOS tube 13 on the fixed block 14; further, a connecting post through hole is formed in the connecting post 142, a lower cover 2 through hole is formed in the lower cover 2, a heat sink 15 through hole is formed in the heat sink 15, and a fastener 16 is inserted through the heat sink 15 through hole, the lower cover 2 through hole and the connecting post through hole in order to fix the heat sink 15 to the lower cover 2 and the fixing block 14, wherein the fastener 16 may be a self-tapping screw.

In this embodiment, the fixing block 14 can be used to place the MOS tube 13 for movement, and the heat-conducting silicone grease smeared on the metal surface of the MOS tube 13 can effectively transfer the heat generated by the MOS tube 13 to the outside of the switch through the heat sink 15, so as to reduce the possibility of the influence on the MOS tube 13 and the failure of the function of the control circuit board 11 as much as possible.

As shown in fig. 1-5, a reversing component 17 is arranged above the base body 1;

the reversing assembly 17 comprises a reversing turntable 171, a reversing movable contact group 172 arranged at the bottom of the reversing turntable 171, and a welding sheet group 173 and an output terminal group 174 which are arranged below the reversing movable contact group 172, wherein the welding sheet group 173 is connected with the static contact pin 8 and the output pin 9; a reversing spring is arranged between the reversing movable contact group 172 and the reversing turntable 171.

It can be understood that the outer surface of the top of the base body in this embodiment is provided with a first groove group and a second groove group, the soldering tab group 173 is disposed in the first groove group, and the output terminal group 174 is disposed in the second groove group.

Further, as shown in fig. 5, a through hole 1711 may be provided on the side of the reversing turntable 171, a steel ball spring 175 may be provided in the through hole 1711, and further steel balls 176 may be provided at both ends of the steel ball spring 175, and an upper cover groove may be provided on the inner side of the upper cover 3, so that the reversing turntable 171 drives the steel balls 176 to jump in the upper cover groove when rotating, so that the reversing turntable 171 has an obvious gear feel when rotating, and in particular, the upper cover may be provided as a V-shaped groove.

It should be noted that, as shown in fig. 5, a reversing spring set 177 is disposed between the reversing movable contact set 172 and the reversing turntable 171, one end of the reversing spring set 177 is disposed on a top positioning column of the reversing turntable 171, and the other end of the reversing spring set 177 is disposed on a positioning column of the reversing movable contact set 172.

In this embodiment, two reversing turntable grooves are disposed at the bottom of the reversing turntable 171, and the reversing movable contact group 172 is disposed in the reversing turntable grooves, so that when the reversing turntable 171 is rotated, the reversing turntable drives the reversing movable contact group 172 to switch between the welding piece group 173 and the output terminal group 174, thereby realizing the reversing function of the switch.

Since the bonding pad group 173 is connected to the stationary contact pin 81 and the output pin 9, when the switch reversing lever is shifted to the right direction, the output pin 174 is connected to the adjacent bonding pad through the reversing movable contact 172, and when the reversing turntable 171 is rotated in the second direction (e.g., counterclockwise) to the left direction, the reversing function is realized by connecting the reversing movable contact group 172 to the other bonding pad in the bonding pad group 173. When the switch reversing handle is shifted to the middle gear, the output pin 174 is not contacted with the welding sheet group 173, so that the switching-off function of the switch reversing is realized.

As shown in fig. 5, the upper cover 3 is provided with an arc hole 301, the top of the reversing turntable 171 is provided with a reversing handle 1712, and the reversing handle 1712 extends out of the upper cover 3 through the arc hole 301 and can rotate in the arc hole 301, so as to drive the reversing movable contact set arranged in the reversing turntable 171 to rotate.

As shown in fig. 1-2 and 5, the switch further includes a diode 18 disposed on the base body 1, one end of the diode 18 is connected to the output pin 9, and the other end of the diode 18 is connected to the static contact pin 81. The diode 18 can absorb the reverse electromotive force generated by the switch when the duty ratio of the motor is the null output in the PWM pulse speed regulation process, and the reverse electromotive force is also called spike voltage, so that the circuit elements and the MOS tube on the switch circuit board assembly 11 are effectively protected.

As shown in fig. 3-5, a speed regulating reed 19 is arranged at the bottom of the push shaft 4, and the speed regulating reed 19 can slide on the surface of the circuit board assembly 11 under the drive of the push shaft 4.

Specifically, a push shaft groove 41 may be provided on the push shaft 4 at a side close to the circuit board assembly 11, and a fixing post 411 may be provided in the push shaft groove 41, and the speed reed 19 may be provided in the push shaft groove 41 and fixed to the fixing post 411.

As shown in fig. 5, one end of the moving contact group 51 is provided with a moving contact bending group 511, and the pushing shaft 4 is provided with a pushing shaft clamping block group 42 matched with the moving contact bending group 511;

a moving contact clamping groove group 512 is arranged in the middle of the moving contact group, a support groove group 61 matched with the moving contact clamping groove group 512 is arranged on the moving contact support 6, and the moving contact group can rotate by taking the support groove group 61 as a fulcrum;

a bracket clamping hole group 62 is arranged on the movable contact bracket 6, a movable contact clamping hole group 513 is arranged on the movable contact group 51, one end of the movable contact spring sheet group 7 is arranged in the bracket clamping hole group 62, and the other end is arranged in the movable contact clamping hole group 513;

the switch also comprises a reset inner spring 20, a reset outer spring 21, a positioning column 22, a sealing ring 23 and a trigger 24;

the push shaft 4 is arranged at one end in the box body, a push shaft hole is formed in the push shaft hole, a brake block 25 is arranged in the push shaft hole, one end of a reset inner spring 20 is inserted into the reset outer spring 21, the other end of the reset inner spring is propped against the brake block 25, one end of the reset outer spring 21 is arranged in the push shaft hole, the other end of the reset outer spring is arranged on the positioning column 22, when the switch is released, the brake block 25 can directly short-circuit two poles of a motor, and the reverse electromotive force of the motor is quickly reduced to zero, so that a braking function is realized.

The base body 1 is provided with a base body semicircular groove 101, the lower cover 2 is provided with a lower cover semicircular groove 201, and the sealing ring 23 is arranged in a circular groove formed by the base body semicircular groove 101 and the lower cover semicircular groove 201;

the trigger 24 is disposed on the pushing shaft 4 at one end extending out of the box.

As shown in fig. 5, the base body 1 is provided with a first base body bar hole 102, a second base body bar hole 103, a third base body bar hole 104 and a fourth base body bar hole 105, one end of the static contact pin extends out of the base body 1 through the first base body bar hole 102, and the other end is clamped on the base body 1 through the second base body bar hole 103; one end of the output pin 9 extends out of the base body 1 through the base body third strip-shaped hole 104, and the other end is clamped on the base body 1 through the base body fourth strip-shaped hole 105;

the lower cover 2 is provided with a first lower cover strip hole 202 and a second lower cover strip hole 203, the moving contact support 6 extends out of the box body through the first lower cover strip hole 202, and the input pin 10 extends out of the box body through the second lower cover strip hole 203.

As shown in fig. 5-6, wedge blocks 105 are disposed on two outer sidewalls of the base body 1, and rectangular holes 204 matched with the first wedge blocks 105 are disposed on two sides of the lower cover 2.

It can be appreciated that in this public embodiment, can be provided with round recess in lower cover 2, base body 1 below all is provided with round boss, just forms the maze after the equipment is accomplished and to inserting the structure, can realize the dustproof function of main part position.

The working process of the speed regulating switch of the direct-current integrated trigger 24 provided by the disclosure is as follows:

when the trigger 24 is pressed, the push shaft 4 moves rightward under the driving of the trigger 24, the push shaft 4 is gradually separated from the tail part of the push contact group 51, under the action of the moving contact spring sheet group 7, the moving contact group 51 rotates clockwise by taking the bracket groove group 61 on the moving contact bracket 6 as a fulcrum, and after the moving contact 52 on the moving contact group 51 contacts with the fixed contact group 82 on the fixed contact 81, so that the switching-on function of the switch is realized, at the moment, the circuit board assembly 11 is switched on by current, and the circuit board assembly 11 outputs a control signal to the MOS tube 13.

When the trigger 24 is continuously pressed, the push shaft 4 is driven to slide rightwards continuously, the speed regulating reed 19 arranged on one side of the push shaft 4 is driven to slide rightwards on the circuit board assembly 11, the speed regulating reed 19 slides rightwards on the resistor strip, the output resistance on the circuit board assembly 11 is gradually reduced, the control signal of the relevant speed regulating voltage rising output by the integrated control chip on the circuit board assembly 11 is transmitted to the MOS tube 13, the gradually rising voltage is output to the electric tool through the output terminal group 174, and therefore the electronic speed regulating and boosting functions of the electric tool are realized.

When the trigger 24 is loosened, the push shaft 4 is gradually reset under the action of the reset outer spring 21 and the reset inner spring 20, the push shaft 4 slides leftwards to drive the speed regulating reed 19 to slide leftwards, the speed regulating reed 19 slides leftwards on the resistor belt, the output resistance on the circuit board assembly 11 gradually becomes larger, the integrated control chip on the circuit board assembly 11 outputs a control signal for reducing the speed regulating voltage, and the control signal is transmitted to the MOS tube 13 to output the gradually reduced voltage to the electric tool through the output terminal group 174, so that the electronic speed regulating and voltage reducing function of the switch is realized; and finally, the pushing shaft 4 presses the tail part on the movable contact group, so that the switch is disconnected, the circuit board assembly 11 is completely not electrified, the switch does not output, and the disconnection function of the switch is realized.

When the reversing turntable 171 is shifted, the reversing turntable 171 drives the reversing movable contact group 172 to rotate, and the welding piece and the output terminal group 174 are switched, so that the reversing function of the electric tool is realized.

As shown in fig. 8-13, the present disclosure provides a dc integrated trigger 24 speed regulating switch, and the circuit operation principle thereof is as follows:

BAT is a battery pack, B+ is an anode of the battery pack, B-is a cathode of the battery pack, M is a direct current brush motor, K1 is a main switch, K3 is a brake pad, D5 is a freewheeling diode 18, Q6 is a MOSFET, and PWM is used for controlling the on-time of the motor so as to realize speed control. R20 is the internal resistance of the negative electrode pin, and the current of the loop is collected. T1 is a thermistor mounted next to the lithium battery to detect the battery temperature.

1. When trigger 24 is depressed, K3 is opened and then K1 is closed, and circuit board assembly 1127 is powered up, providing VCC1 voltage through MUN5313, and providing VDD operating power to the chip through R1, C1, Z1, R3, R4, C7. When the VDD voltage is greater than the reset voltage of the chip U1, U1 starts to operate. After the U1 software delays for 50ms, the voltage of B+ is detected through R22, R23, R24 and C11, the temperature of the battery is detected through T1, R27, R28 and C12, if the battery is normal, the lighting function is realized through R8, Q1, LEDs and RL1, the electric quantity display function is realized through L1, L2, L3, LR9, R10 and R11, and the conduction time of Q2 is controlled to be prolonged through U2, R2, C2, R13, D4 and Z2, so that the voltage rise and the rotation speed rise of the electric tool are realized.

2. When the trigger 24 is slowly released, the conducting time of Q2 is controlled to be shortened through U2, R2, C2, R13, D4 and Z2, so that the voltage of the electric tool is reduced, the rotating speed is also reduced, the trigger 24K1 is continuously released to be disconnected, and when the VDD voltage is smaller than the U1 reset voltage, the circuit board is powered off, the MC51F003A4 stops working, and the MOS tube 13 does not output voltage. Until trigger 24 is completely released, K3 is closed, at which time the poles of the motor are shorted directly, thus realizing the braking function of the electric tool.

3. In the normal speed regulation process of the whole electric tool, the chip continuously detects the current of the motor through R7, R20 and C9 and the voltage and the temperature of the battery through related circuits, if one of the chips is abnormal, the chip starts a protection program to close PWM output, and the motor stops rotating, so that the overcurrent protection and undervoltage protection effects are achieved.

4. After the switch enters a protection state, the chip 10 pin is kept at a low level all the time without loosening the trigger 24 and without disconnecting K1, and the motor does not rotate. When trigger 24 is released and then depressed, the process repeats 1-3.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the switch in the present disclosure, and not for limiting the protection scope of the switch in the present disclosure, although the switch in the present disclosure is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the switch in the present disclosure without departing from the spirit and scope of the technical solution of the switch in the present disclosure.

Claims

1. The miniature direct current speed regulation switch is characterized by comprising a base body, a lower cover, an upper cover and a push shaft, wherein one end of the push shaft is arranged in a box body formed by the base body and the lower cover, and the other end of the push shaft extends out of the box body;

a movable contact assembly in contact with the pushing shaft and a movable contact bracket supporting the movable contact assembly are arranged above the pushing shaft, and a movable contact spring sheet group is arranged between the movable contact assembly and the movable contact bracket; a static contact pin assembly and an output pin are arranged above the movable contact pin assembly, and an input pin is arranged on one side of the push shaft; the movable contact assembly comprises a movable contact group and a movable contact group arranged on the movable contact group, and the static contact pin assembly comprises a static contact pin and a static contact group arranged on the static contact pin;

a circuit board assembly is arranged below the pushing shaft, a control circuit and a programming interface are arranged on the circuit board assembly, and the programming interface extends out of the base body; and an MOS tube is arranged below the circuit board assembly, and the MOS tube, the moving contact support, the static contact pin, the output pin and the input pin are respectively connected with the circuit board assembly.

2. The miniature dc speed switch of claim 1, wherein: the control circuit comprises an electronic speed regulating circuit, a battery over-temperature protection circuit, a motor over-current protection circuit, an under-voltage protection circuit and an electric quantity display circuit;

3. A miniature dc speed regulating switch according to claim 1 or 2, characterized in that: a fixed block for fixing the MOS tube is arranged between the circuit board assembly and the MOS tube, the top of the fixed block is connected with the circuit board assembly, and the bottom of the fixed block is connected with the lower cover;

4. A miniature dc speed regulating switch according to claim 1 or 2, characterized in that: a reversing assembly is arranged above the base body;

5. A miniature dc speed regulating switch according to claim 1 or 2, characterized in that: the switch also comprises a diode arranged on the base body, one end of the diode is connected with the output pin, and the other end of the diode is connected with the static contact pin.

6. A miniature dc speed switch as defined in claim 3 wherein: the top of the fixed block is provided with a connecting block, and the circuit board is provided with a connecting hole matched with the connecting block; the bottom of the fixed block is provided with a connecting column, the MOS tube is provided with a connecting plate, the connecting plate is provided with a mounting hole, and the connecting column penetrates through the mounting hole to fix the MOS tube on the fixed block;

7. A miniature dc speed regulating switch according to claim 1 or 2, characterized in that: the bottom of the pushing shaft is provided with a speed regulating reed, and the speed regulating reed can slide on the surface of the circuit board assembly under the drive of the pushing shaft.

8. The miniature dc speed switch of claim 4, wherein: one end of the movable contact group is provided with a movable contact bending group, and the push shaft is provided with a push shaft clamping block group matched with the movable contact bending group;

9. A miniature dc speed regulating switch according to claim 1 or 2, characterized in that: the switch also comprises a reset inner spring, a reset outer spring, a positioning column, a sealing ring and a trigger;

10. The miniature dc speed switch of claim 7, wherein: a push shaft groove is formed in one side, close to the circuit board assembly, of the push shaft, a fixed column is arranged in the push shaft groove, and the speed regulating reed is arranged in the push shaft groove and fixed on the fixed column;