Brush motor brake circuit structure, electric saw, grass trimmer and hedge trimmer

Abstract

The utility model belongs to the technical field of brush motors, and particularly relates to a brush motor brake circuit structure, an electric saw, a grass trimmer and a hedge trimmer, which comprises a circuit mounting box, and a first pin, a second pin and a third pin are arranged outside the circuit mounting box; a wiring terminal; the adjusting switch is used for connecting the wiring terminal, and the adjusting block is used for driving the adjusting switch to be conducted with the wiring terminal; the direct-current motor is connected with a power supply; a three-pin microswitch structure is formed by the first pin, the second pin, the third pin and the adjusting switch, and reverse connection of the switch is achieved by closing different paths of the three-pin microswitch. After the motor is turned off, current generated when the motor cuts magnetic induction lines due to inertia rotation flows back to the interior of the motor again, so that reverse braking is generated to achieve rapid braking of the motor, braking is not achieved in an external force mode, operation is easy, and safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of brushed motors, and in particular relates to a brushed motor braking circuit structure and an electric saw, a grass trimmer and a hedge trimmer. Background Art

[0002] A brushed motor is a motor that contains a brush device that converts electrical energy into mechanical energy or mechanical energy into electrical energy. It is usually used in ordinary equipment and has a long service life. The working life of a brushed motor is about several hundred hours. The cost of replacing the brushes in a brushed motor is low, and the economic benefit is high. It is often used as the power output part of daily electrical tools.

[0003] The patent with publication number CN 201813254 U discloses a braking device, and in particular, relates to a braking device for a brushed DC motor. A braking device for a brushed DC motor comprises a bracket arranged on a motor housing, a start contact and a brake contact are arranged at relative positions in the bracket, a hole is arranged on the bracket, a joystick is movably sleeved on the hole, a return spring is sleeved on one end of the joystick, one end of the return spring abuts on the bottom surface of the upper end of the joystick, and the other end abuts on the bracket, an insulating pressure plate is arranged on the joystick, and the insulating pressure plate is located between the start contact and the brake contact.

[0004] The above device also has the following technical problems: when the motor is disconnected from the current and completes the work, in order to make the driving end of the motor stop quickly, the prior art often adopts the method of adding brake pads and contacts to the rotating end of the motor to achieve the braking of the driving end of the motor; using this braking method will cause wear to the rotating end of the motor, and the braking efficiency is low, and it is very easy to cause vibration and damage to the driving end of the motor due to the rigid contact between the brake pad and the rotating end. Therefore, it is necessary to design a circuit structure that can achieve the rapid braking of the DC brushed motor. Utility Model Content

[0005] The purpose of the utility model is to provide a brush motor brake circuit structure and an electric saw, a grass trimmer, and a hedge trimmer to solve the problems raised in the above background technology. The following technical solution is provided: a brush motor brake circuit structure, comprising:

[0006] A circuit installation box, wherein a first pin, a second pin and a third pin are arranged on the outside of the circuit installation box;

[0007] The wiring terminal is composed of a reverse terminal and a forward terminal, wherein the reverse terminal and the forward terminal are connected to the second pin and the third pin respectively;

[0008] The regulating switch is hingedly arranged on the inner end wall of the circuit installation box and is used to connect the wiring terminal, and one end of the first pin is connected to the regulating switch;

[0009] The regulating block is arranged at the lower end wall of the circuit installation box, and is used to drive the regulating switch to be connected with the wiring terminal;

[0010] A DC motor, wherein two ends of the DC motor are respectively connected to a first pin and a second pin;

[0011] The power supply is connected between the second and third pins and is used to power the circuit.

[0012] In the technical solution, during the operation of the DC brushless motor, after the switch of the DC motor is disconnected, the DC motor end load output will continue to rotate for a certain period of time due to inertia; in order to prevent the output end of the DC motor from running after power failure, the motor end is quickly braked;

[0013] Press the adjustment block with your hand, and the adjustment block drives the adjustment switch to swing. When the adjustment switch swings, it is separated from the forward terminal and connected to the reverse terminal;

[0014] In the initial state, the spring is connected to the first pin through a wire, the first pin is connected to the DC motor through a wire, the other end of the DC motor is connected to the power supply through a wire and then connected to the third pin, at this time the whole circuit is closed. The motor starts working;

[0015] When the regulating block drives the regulating switch to swing, the regulating switch is disconnected from the positive terminal and connected to the reverse terminal. At this time, the entire circuit is disconnected, and the two ends of the DC motor are connected through the second pin, the regulating switch and the first pin. At this time, the DC motor rotates due to inertia, and the DC motor cuts the magnetic flux lines inside to generate current (dynamic electricity). The current flow direction at this time is opposite to the power supply direction of the power supply. Therefore, the current generated by inertia is connected to the DC motor itself, which has a braking effect on the rotation of the DC motor, ensuring that the DC motor can be quickly stopped under its own inertial rotation;

[0016] The first pin, the second pin, the third pin and the regulating switch arranged inside the internal circuit installation box constitute a three-pin micro switch structure, and the braking stop of the DC motor end is finally achieved by closing different paths of the three-pin micro switch.

[0017] In any of the above technical solutions, further, a spring is provided at the upper end of the regulating switch, the spring is in a compressed state, and the upper end of the spring is fixedly connected to the end wall of the circuit installation box.

[0018] In the technical solution, the spring is in a compressed state, which ensures that the regulating switch and the positive terminal are in a normally closed state, thereby ensuring the stability of the DC motor during operation.

[0019] In any of the above technical solutions, further, a push rod is fixedly provided on the upper end of the adjustment block, and the upper end of the push rod always abuts against the lower side of the spring.

[0020] In the present technical solution, the push rod is made of insulating material. When the upper end of the push rod moves, the upper end of the push rod slides and rubs against the lower end of the regulating switch, driving the spring to swing in the vertical direction, thereby ensuring that the regulating switch can be connected to the reverse terminal and the forward terminal respectively.

[0021] An electric saw with a brushed motor brake circuit, comprising:

[0022] An electric saw housing, a power source is arranged at the lower end of the electric saw housing, a circuit installation box is arranged in the middle of the electric saw housing, a DC motor is arranged at one side of the electric saw housing, and a saw blade is arranged at one end of the DC motor;

[0023] A button is hingedly provided on the housing of the electric saw, and the upper side of the button abuts against the adjusting block for reverse braking of the saw blade.

[0024] In the present technical solution, the DC motor drives the saw blade to rotate after starting, and the saw blade is the load end. Since the adjustment block is placed inside the electric saw casing, the adjustment block is driven to move by pressing a button, and then the movement of the adjustment block controls the opening and closing states of the adjustment switch and the reverse terminal and the forward terminal, thereby realizing reverse conduction of the DC motor and rapid braking of the saw blade.

[0025] A hedge trimmer with a brush motor brake circuit, comprising:

[0026] A hedge trimmer housing is provided, a handle is provided on one side of the hedge trimmer housing, a power supply is arranged in the hedge trimmer housing, a circuit installation box is arranged at the upper end of the hedge trimmer housing, a DC motor is arranged at the lower end of the handle; and a hedge trimmer chain is provided on one side of the DC motor, a button is provided in the middle of the hedge trimmer housing, the button is abutted against the adjustment block, and is used for reverse braking of the hedge trimmer chain.

[0027] In the present technical solution, after the DC motor is started, it drives the hedge trimmer chain to rotate. The hedge trimmer chain is the load end. Since the adjustment block is placed inside the hedge trimmer housing, the adjustment block is driven to move by pressing a button, and then the movement of the adjustment block controls the opening and closing states of the adjustment switch and the reverse terminal and the forward terminal, thereby achieving rapid braking and stopping of the hedge trimmer chain.

[0028] A grass trimmer with a brush motor brake circuit, comprising:

[0029] A lawn mower housing, a handle is provided on the upper side of the lawn mower housing, a power supply is arranged at the lower end of the lawn mower housing, a circuit installation box is provided on the upper side of the lawn mower housing, a button is provided on the upper side of the circuit installation box, and a DC motor is provided on one side of the lawn mower housing, one end of the DC motor is connected to a lawn mower head, and the button is abutted against the adjustment block for reverse braking of the DC motor.

[0030] In the present technical solution, one end of the DC motor is connected to the mowing head. After the DC motor is started, the inertia causes the mowing rope to be thrown out of the mowing head. The adjustment block is driven to move by pressing a button, and the movement of the adjustment block controls the opening and closing states of the adjustment switch and the reverse terminal and the forward terminal, thereby realizing rapid braking and stopping of the DC motor.

[0031] The beneficial effects of the utility model are as follows: a three-pin micro switch structure is formed by setting the first pin, the second pin, the third pin and the adjustment switch, and the switch reverse connection is achieved by closing different paths of the three-pin micro switch; after the motor is turned off, the current generated by the motor cutting the magnetic flux lines due to inertial rotation flows back to the inside of the motor again, thereby generating reverse braking to achieve rapid braking of the motor, and this braking does not achieve braking by external force, and the operation is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the utility model;

[0033] Figure 2 It is a schematic diagram of the electric saw in the utility model;

[0034] Figure 3 yes Figure 2 A partial enlarged schematic diagram of

[0035] Figure 4 It is a schematic diagram of the hedge trimmer in the utility model;

[0036] Figure 5 It is a schematic diagram of a grass trimmer in the utility model.

[0037] The reference numerals in the figure are: 10, circuit installation box; 11, first pin; 12, second pin; 13, third pin; 20, wiring terminal; 21, reverse terminal; 22, forward terminal; 30, adjustment switch; 31, spring; 40, adjustment block; 41, push rod; 42, button; 50, DC motor; 51, saw blade; 52, hedge trimmer chain; 53, mower head; 60, power supply; 70, electric saw casing; 80, mower casing; 81, handle; 90, mower housing; 91, grip. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0039] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] Embodiment 1:

[0041] like Figure 1 As shown, this embodiment provides a brushed motor braking circuit structure, including:

[0042] A circuit installation box 10, the outside of which is provided with a first pin 11, a second pin 12 and a third pin 13;

[0043] The connection terminal 20 is composed of a reverse terminal 21 and a forward terminal 22, and the reverse terminal 21 and the forward terminal 22 are connected to the second pin 12 and the third pin 13 respectively;

[0044] The regulating switch 30 is hingedly arranged at the inner end wall of the circuit installation box 10 and is used to connect the wiring terminal 20, and one end of the first pin 11 is connected to the regulating switch 30;

[0045] The regulating block 40 is arranged at the lower end wall of the circuit installation box 10, and the regulating block 40 is used to drive the regulating switch 30 to be connected with the connecting terminal 20;

[0046] A DC motor 50, two ends of the DC motor 50 are respectively connected to a first pin 11 and a second pin 12;

[0047] The power supply 60 is connected to the second pin 12 and the third pin 13 and is used for powering the circuit.

[0048] In the technical solution, during the operation of the DC brushless motor, after the switch of the DC motor is disconnected, the output end of the DC motor 50 will continue to rotate for a certain period of time due to inertia; in order to prevent the output end of the DC motor 50 from running after power failure, the motor end is quickly braked;

[0049] The hand presses the adjustment block 40, and the adjustment block 40 drives the adjustment switch 30 to swing. When the adjustment switch 30 swings, it is separated from the forward terminal 22 and connected to the reverse terminal 21;

[0050] In the initial state, the spring 31 is connected to the first pin 11 through a wire, the first pin 11 is connected to the DC motor 50 through a wire, the other end of the DC motor 50 is connected to the power supply 60 through a wire and then connected to the third pin 13, and the whole circuit is closed. The motor starts to work;

[0051] When the regulating block 40 drives the regulating switch 30 to swing, the regulating switch 30 is disconnected from the positive terminal 22 and connected to the reverse terminal 21. At this time, the entire circuit is disconnected, and the two ends of the DC motor 50 are connected through the second pin 12, the regulating switch 30 and the first pin 11. At this time, the DC motor 50 rotates due to inertia, and the DC motor 50 cuts the magnetic flux lines to generate current (dynamic electricity). The current flow direction at this time is opposite to the power supply direction of the power supply 60. Therefore, the current generated by inertia is connected to the DC motor 50 itself, which has a braking effect on the rotation of the DC motor 50, ensuring that the DC motor 50 can be quickly stopped under its own inertial rotation;

[0052] The first pin 11, the second pin 12, the third pin 13 and the regulating switch 30 provided inside the internal circuit installation box 10 constitute a three-pin micro switch structure, and the DC motor 50 is finally braked to a stop by closing different paths of the three-pin micro switch.

[0053] like Figure 1 As shown, specifically, a spring 31 is provided at the upper end of the regulating switch 30 , the spring 31 is in a compressed state, and the upper end of the spring 31 is fixedly connected to the end wall of the circuit installation box 10 .

[0054] In the present technical solution, the spring 31 is in a compressed state, which ensures that the regulating switch 30 and the positive terminal 22 are in a normally closed state, thereby ensuring the stability of the DC motor 50 during operation.

[0055] like Figure 1 As shown, specifically, a push rod 41 is fixedly provided on the upper end of the adjustment block 40 , and the upper end of the push rod 41 always abuts against the lower side of the spring 31 .

[0056] In the present technical solution, the top rod 41 is made of insulating material. When the upper end of the top rod 41 moves, the upper end of the top rod 41 slides and rubs against the lower end of the regulating switch 30, driving the spring 31 to swing in the vertical direction, thereby ensuring that the regulating switch 30 can be connected to the reverse terminal 21 and the forward terminal 22 respectively.

[0057] Embodiment 2:

[0058] like Figure 2 ,3 As shown, an electric saw with a brush motor brake circuit comprises:

[0059] The electric saw housing 70, the power supply 60 is arranged at the lower end of the electric saw housing 70, the circuit installation box 10 is arranged in the middle of the electric saw housing 70, the DC motor 50 is arranged on one side of the electric saw housing 70, and a saw blade 51 is arranged at one end of the DC motor 50;

[0060] A button 42 is hingedly provided on the electric saw housing 70 , and the upper side of the button 42 abuts against the adjustment block 40 for reverse braking of the saw blade 51 .

[0061] In the present technical solution, after the DC motor 50 is started, it drives the saw blade 51 to rotate, and the saw blade 51 is the load end. Since the adjustment block 40 is placed inside the electric saw housing 70, the adjustment block 40 is driven to move by pressing the button 42, and then the movement of the adjustment block 40 controls the opening and closing states of the adjustment switch 30 and the reverse terminal 21 and the forward terminal 22, thereby realizing reverse conduction of the DC motor 50 and realizing rapid braking of the saw blade 51.

[0062] Embodiment 3:

[0063] like Figure 4 As shown, a hedge trimmer with a brush motor brake circuit comprises:

[0064] A hedge trimmer housing 80 is provided, a handle 81 is provided on one side of the hedge trimmer housing 80, a power supply 60 is arranged in the hedge trimmer housing 80, a circuit installation box 10 is arranged at the upper end of the hedge trimmer housing 80, and a DC motor 50 is arranged at the lower end of the handle 81; and a hedge trimmer chain 52 is provided on one side of the DC motor 50, and a button 42 is provided in the middle of the hedge trimmer housing 80, and the button 42 is against the adjustment block 40 for reverse braking of the hedge trimmer chain 52.

[0065] In the present technical solution, after the DC motor 50 is started, it drives the hedge trimmer chain 52 to rotate. The hedge trimmer chain 52 is the load end. Since the adjustment block 40 is placed inside the hedge trimmer housing 80, the adjustment block 40 is driven to move by pressing the button 42, and then the movement of the adjustment block 40 controls the opening and closing states of the adjustment switch 30 and the reverse terminal 21 and the forward terminal 22, thereby realizing the rapid braking of the hedge trimmer chain 52.

[0066] Embodiment 3:

[0067] like Figure 5 As shown, a lawn mower with a brush motor brake circuit comprises:

[0068] A lawn mower housing 90 is provided with a handle 91 on the upper side of the lawn mower housing 90, a power supply 60 is arranged at the lower end of the lawn mower housing 90, a circuit installation box 10 is provided on the upper side of the lawn mower housing 90, a button 42 is provided on the upper side of the circuit installation box 10, and a DC motor 50 is provided on one side of the lawn mower housing 90, one end of the DC motor 50 is connected to a lawn mower head 53, and the button 42 is abutted against the adjustment block 40 for reverse braking of the DC motor 50.

[0069] In the present technical solution, one end of the DC motor 50 is connected to the mowing head 53. After the DC motor 50 is started, the mowing rope is thrown out of the mowing head 53 by inertia. The adjustment block 40 is driven to move by pressing the button 42, and then the movement of the adjustment block 40 controls the opening and closing states of the adjustment switch 30 and the reverse terminal 21 and the forward terminal 22, thereby realizing the rapid braking of the DC motor 50.

[0070] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A brushed motor braking circuit structure, characterized in that: include: A circuit installation box (10), wherein a first pin (11), a second pin (12) and a third pin (13) are provided on the outside of the circuit installation box (10); A connection terminal (20) is composed of a reverse terminal (21) and a forward terminal (22), wherein the reverse terminal (21) and the forward terminal (22) are connected to the second pin (12) and the third pin (13) respectively; An adjusting switch (30) is hingedly arranged on the inner end wall of the circuit installation box (10) and is used to connect the wiring terminal (20), and one end of the first pin (11) is connected to the adjusting switch (30); An adjustment block (40) is arranged at the lower end wall of the circuit installation box (10), and the adjustment block (40) is used to drive the adjustment switch (30) to be connected to the connection terminal (20); A direct current motor (50), wherein two ends of the direct current motor (50) are respectively connected to the first pin (11) and the second pin (12); A power source (60) is connected to the second pin (12) and the third pin (13) and is used to supply power to the circuit.

2. A brushed motor braking circuit structure according to claim 1, characterized in that: A spring (31) is provided at the upper end of the regulating switch (30), the spring (31) is in a compressed state, and the upper end of the spring (31) is fixedly connected to the end wall of the circuit installation box (10).

3. A brushed motor braking circuit structure according to claim 2, characterized in that: A push rod (41) is fixedly provided at the upper end of the adjustment block (40), and the upper end of the push rod (41) always abuts against the lower side of the spring (31).

4. An electric saw comprising the brushed motor braking circuit structure according to claim 1, characterized in that: include: An electric saw housing (70), the power source (60) is arranged at the lower end of the electric saw housing (70), the circuit installation box (10) is arranged in the middle of the electric saw housing (70), the DC motor (50) is arranged on one side of the electric saw housing (70), and a saw blade (51) is arranged at one end of the DC motor (50).

5. The electric saw with a brushed motor brake circuit structure according to claim 4, characterized in that: A button (42) is hingedly provided on the electric saw housing (70), and the upper side of the button (42) abuts against the adjustment block (40) for reverse braking of the saw blade (51).

6. A hedge trimmer comprising the brushed motor brake circuit structure of claim 1, characterized in that: include: A hedge trimmer housing (80), a handle (81) is provided on one side of the hedge trimmer housing (80), the power supply (60) is arranged in the hedge trimmer housing (80), the circuit installation box (10) is arranged at the upper end of the hedge trimmer housing (80), and the DC motor (50) is arranged at the lower end of the handle (81); and a hedge trimmer chain (52) is provided on one side of the DC motor (50), and a button (42) is provided in the middle of the hedge trimmer housing (80), and the button (42) abuts against the adjustment block (40) and is used for reverse braking of the hedge trimmer chain (52).

7. A grass trimmer comprising the brush motor brake circuit structure according to claim 1, characterized in that: include: A grass trimmer housing (90), wherein a handle (91) is provided on the upper side of the grass trimmer housing (90), the power supply (60) is arranged at the lower end of the grass trimmer housing (90), a circuit installation box (10) is provided on the upper side of the grass trimmer housing (90), a button (42) is provided on the upper side of the circuit installation box (10), and a DC motor (50) is provided on one side of the grass trimmer housing (90), one end of the DC motor (50) is connected to a grass trimmer head (53), and the button (42) abuts against the adjustment block (40) for reverse braking of the DC motor (50).

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