A powder spray gun configured with a light assembly

Abstract

A powder spray gun configured with a lamp assembly, comprising a spray gun body and a lamp assembly mounted on the spray gun body, a high-voltage bag for generating high-voltage static electricity is arranged in the spray gun body, the spray gun body is provided with a trigger switch for controlling the powder spraying work of the powder spray gun, the spray gun body is connected with a powder pump through a powder pipe, and the powder pump is connected with a powder tank through the powder pipe; the trigger switch is connected with a control host through an electric circuit, the control host is used for controlling the work of the powder spray gun; the trigger switch is connected with the high-voltage bag and the powder pump in parallel through an electric circuit, the trigger switch is connected with the lamp assembly through an electric control switch, and the electric control switch is connected with the control host through an electric circuit and an electric signal double-line connection; in the working control of the lamp assembly, the powder spray gun has at least three mode controls, can meet various application requirements of the powder spray gun, and has higher applicability.

Description

Technical Field

[0001] This utility model belongs to the field of powder coating technology, specifically relating to a powder spray gun equipped with a lamp assembly. Background Technology

[0002] The core components of an electrostatic powder spray gun include a powder supply tank, a spray gun, and a controller. Its working principle involves charging the powder particles, causing them to adhere to the workpiece surface and ultimately form a coating that combines protective and decorative functions.

[0003] In actual production, this type of coating operation often uses powder spray guns that can generate high-voltage static electricity. This tool can create a special electric field environment with high voltage and low current. When powder particles pass through it, they are given a negative charge and thus adhere tightly to the workpiece to be coated.

[0004] Powder spray guns come in two types: handheld and automatic. When using a handheld powder spray gun, the operator needs to hold the gun and spray the workpiece, visually adjusting the spraying process to ensure even coating. To allow the operator to clearly observe the powder application on the workpiece and to facilitate manual spraying in low-light conditions, a light assembly can be installed on the powder spray gun to assist the operator.

[0005] Existing powder spray guns, as shown in Chinese patent document CN 115178388 B, disclose a powder spray gun with an integrated or modified lamp, including a gun body and a lamp assembly. The lamp assembly is mounted on the gun body and includes a lamp and a circuit electrically connected to the lamp. The circuit is configured to supply electrical energy to the lamp inductively when a voltage multiplier is activated. In the lamp assembly control of this powder spray gun, the circuit supplies electrical energy to the lamp when the voltage multiplier is activated, and this electrical energy is obtained inductively. Since the powder spray gun is in the powder spraying state when the voltage multiplier is activated, and in the deactivated state when the voltage multiplier is deactivated, this powder spray gun also has the following drawbacks:

[0006] The lighting assembly cannot be controlled by the operator according to their needs; for example, if the operator does not need the lighting assembly when using a powder spray gun, the lighting assembly cannot be turned off; if the operator does not need powder spraying but needs the lighting assembly to check the condition of the workpiece, the lighting assembly cannot be turned on separately.

[0007] The lamp assembly is powered by the circuit inductance. Inside the powder spray gun, there is a voltage multiplier. The discharge needle is connected to the voltage multiplier to release static electricity. There will be interference between the electric field generated by the inductance and the discharge needle. Some powder will not acquire static electricity, which will affect the spraying effect of the powder spray gun. Utility Model Content

[0008] In order to overcome at least some of the shortcomings of the prior art, the present invention provides a powder spray gun with a lamp assembly.

[0009] The technical solution provided by this utility model is as follows:

[0010] A powder spray gun with a lamp assembly includes a spray gun body and a lamp assembly, the lamp assembly being mounted on the spray gun body. The spray gun body contains a high-voltage transformer for generating high-voltage static electricity. The spray gun body also has a trigger switch for controlling powder spraying operations. A powder pump is connected to the spray gun body via a powder tube, and the powder pump is connected to a powder tank via a powder tube. The trigger switch is connected to a control host via a circuit, and the control host controls the operation of the powder spray gun. The trigger switch is connected in parallel with the high-voltage transformer and the powder pump via a circuit. The trigger switch is also connected to the lamp assembly via an electronic control switch, which has both electrical and signal connections with the control host.

[0011] As a further technical solution of this utility model, a constant current source circuit is provided between the electric control switch and the lamp assembly. The electric control switch, the constant current source circuit and the lamp assembly are connected in sequence through a circuit. The constant current source circuit is used to provide a constant current to the lamp assembly.

[0012] As a further technical solution of this utility model, the lamp assembly is also provided with a light control switch, the trigger switch is also circuit-connected to a control switch, the control switch is circuit-connected to the light control switch circuit, the light control switch is circuit-connected to the constant current source circuit, and the control host is connected to the control switch via an electrical signal.

[0013] As a further technical solution of this utility model, the lamp assembly is detachably installed on the spray gun body by means of a snap-fit.

[0014] As a further technical solution of this utility model, the lamp assembly includes a lamp housing, a lamp control circuit board, a light source board, a positive terminal board, and a negative terminal board. The lamp control circuit board and the light source board are installed inside the lamp housing. The lamp control circuit board and the light source board are electrically connected. The lamp control circuit board provides power to the light source board and controls the light source board to emit light. The front side of the lamp housing is provided with a light outlet. The light emitted by the light source board is emitted outward through the light outlet to achieve illumination. The bottom of the lamp housing is provided with a power connection hole. The positive terminal board and the negative terminal board are located in the power connection hole. The positive terminal board and the negative terminal board are respectively connected to the lamp control circuit board through a circuit.

[0015] As a further technical solution of this utility model, the spray gun body includes a spray gun shell and a contact spring assembly. The spray gun shell has a mounting cavity for installing the contact spring assembly. The contact spring assembly is installed in the mounting cavity. The top of the spray gun shell has two pop-out holes. The top of the contact spring assembly has an upwardly protruding positive terminal and a negative terminal. The positive terminal and the negative terminal extend from the two pop-out holes respectively. When the lamp assembly is assembled on the spray gun body, the positive terminal contacts the positive terminal plate to achieve electrical connection, and the negative terminal contacts the negative terminal plate to achieve electrical connection.

[0016] As a further technical solution of this utility model, the contact spring assembly includes a movable plate, a telescopic column, a spring, and a telescopic guide sleeve. The telescopic guide sleeve is fixed to the bottom of the mounting cavity. The telescopic guide sleeve is axially fitted onto the outside of the telescopic column from the bottom end. The spring is axially fitted onto the outside of the telescopic column from the top end. The movable plate is fixed to the top end of the telescopic column. The two ends of the spring are respectively limited by the bottom surface of the movable plate and the top surface of the telescopic guide sleeve. The positive and negative contact terminals are both fixedly mounted on the movable plate. The positive and negative contact terminals are respectively connected to a trigger switch via a circuit.

[0017] The beneficial effects of this utility model are as follows: the operator can control the operation of the spray gun body and the lamp assembly through the control host and trigger switch. When the spray gun body needs to perform powder spraying, the operator presses the trigger switch, and the control host controls the high-voltage pack and powder pump to work, and the spray gun body sprays out electrostatic powder. In terms of lamp assembly operation control, the powder spray gun has at least three control modes, which can meet the various applicable needs of the powder spray gun and has higher applicability. Moreover, the lamp assembly obtains power through the circuit connection to the control host, which will not interfere with the electric field generated by the discharge needle, so that the powder sprayed by the powder spray gun can stably obtain electrostatic charge. In addition, the current transmitted by the control host to the lamp assembly through the circuit is a low voltage, and the current and voltage only need to be 5V or 12V, which can effectively improve the safety of the lamp assembly operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure of the powder spray gun in this embodiment;

[0019] Figure 2 This is a schematic diagram of the electrical connection of the powder spray gun in this embodiment;

[0020] Figure 3 This is a circuit diagram of the constant current source circuit in this embodiment;

[0021] Figure 4 This is a partial cross-sectional view showing the connection between the spray gun body and the lamp assembly in this embodiment;

[0022] Figure 5 for Figure 4 Enlarged view of section A;

[0023] Figure 6 This is an exploded view of the spray gun housing and the electrical contact spring assembly in this embodiment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0027] like Figures 1 to 6As shown, this embodiment discloses a powder spray gun with a lamp assembly, including a spray gun body 1 and a lamp assembly 2. The lamp assembly 2 is mounted on the spray gun body 1. The spray gun body 1 is provided with a high-voltage transformer 11 for generating high-voltage static electricity. The spray gun body 1 is provided with a trigger switch 12 for controlling the powder spraying operation of the powder spray gun. The spray gun body 1 is connected to a powder pump 3 through a powder pipe. The powder pump 3 is connected to a powder tank 4 through a powder pipe. The trigger switch 12 is connected to a control host 5 through a circuit. The control host 5 is used to control the operation of the powder spray gun. The trigger switch 12 is connected in parallel to the high-voltage transformer 11 and the powder pump 3 through a circuit. The trigger switch 12 is connected to the lamp assembly 2 through an electronic control switch 6. The electronic control switch 6 and the control host 5 have a dual-line connection of circuit and electrical signal. In this embodiment, the operator can control the operation of the spray gun body 1 and the lamp assembly 2 via the control host 5 and trigger switch 12. When the spray gun body 1 needs to perform powder coating, the operator presses the trigger switch 12, and the control host 5 controls the high-voltage coil 11 and powder pump 3 to operate, causing the spray gun body 1 to spray out electrostatically charged powder. The operator can also control the state of the electronic control switch 6 via the control host 5. When the control host 5 controls the electronic control switch 6 to be in the closed state, the operator presses the trigger switch 12, and the current output from the control host 5 passes through the trigger switch 12 and the electronic control switch 6, and is then input to the lamp assembly 2, causing the lamp assembly 2 to emit light. This ensures that when the spray gun body 1 is spraying, the lamp assembly 2 will start illuminating synchronously. When the control host 5 controls the electric control switch 6 to be in the open state, the operator presses the trigger switch 12. The current output by the control host 5 passes through the trigger switch 12 and cannot be input to the lamp assembly 2 through the electric control switch 6. At this time, the spray gun body 1 is spraying, and the lamp assembly 2 does not start illuminating. When the control host 5 controls the electric control switch 6 to be in the closed state, the operator operates the control host 5 to output current to the connection circuit between the control host 5 and the electric control switch 6. The current passes through the electric control switch 6 and is input to the lamp assembly 2, and the lamp assembly 2 remains in the constantly lit state. Therefore, the powder spray gun in this embodiment has three control modes for the lighting of the lamp assembly 2, which can meet the various applicable needs of the powder spray gun and has higher applicability. Moreover, the lamp assembly 2 obtains power through the circuit connection to the control host 5, which will not interfere with the electric field generated by the discharge needle, so that the powder sprayed by the powder spray gun can stably obtain static electricity. In addition, the current transmitted from the control host 5 to the lamp assembly 2 through the circuit is a weak current, and the current and voltage only need to be 5V or 12V, which can effectively improve the safety of the lamp assembly 2 during operation.

[0028] As a further implementation of this embodiment, a constant current source circuit 7 is also provided between the electronic control switch 6 and the lamp assembly 2. The electronic control switch 6, the constant current source circuit 7, and the lamp assembly 2 are connected sequentially through a circuit. The constant current source circuit 7 is used to provide a constant current to the lamp assembly 2, thereby stabilizing the operating current of the lamp assembly 2 and ensuring that the lamp assembly 2 can work normally. When the operator controls the lamp assembly 2 to be in a constantly lit state through the control host 5, the electronic control switch 6 is in a closed state. The control host 5 outputs current to the connection circuit between the control host 5 and the electronic control switch 6. This current is then input to the lamp assembly 2 after passing through the electronic control switch 6. If the operator also operates the trigger switch 12 on the spray gun body 1 to perform powder spraying, the control host 5 will also output current to the lamp assembly 2 through the trigger switch 12 and the electronic control switch 6. The current received by the lamp assembly 2 is twice the rated current. If the current is not processed, it can easily cause overcurrent damage to the lamp assembly 2. This embodiment, by setting a constant current source circuit 7 between the electronic control switch 6 and the lamp assembly 2, keeps the input current of the lamp assembly 2 constant, avoiding overcurrent damage to the lamp assembly 2.

[0029] Specifically, the constant current source circuit 7 includes a sampling resistor R1, a transistor Q1, a transistor Q2, and a bias resistor R2. The current input terminal of the constant current source circuit 7 is connected to the positive terminal of the sampling resistor R1 and the emitter of the transistor Q2 through a circuit. The negative terminal of the sampling resistor R1 is connected to the emitter of the transistor Q1 and the base of the transistor Q2 through a circuit. The collector of the transistor Q2 is connected to the base of the transistor Q1 and the positive terminal of the bias resistor R2 through a circuit. The emitter of the transistor Q1 is connected to the positive terminal of the lamp assembly 2 through a circuit. The negative terminal of the lamp assembly 2 is connected to the negative terminal of the bias resistor R2 through a circuit. Both transistors Q1 and Q2 are PNP type transistors. The conduction voltage of transistor Q2 is set to the voltage when the rated current of lamp assembly 2 flows through sampling resistor R1. That is, when the input current of constant current source circuit 7 is less than or equal to the rated current of lamp assembly 2, transistor Q2 is not conducting, and transistor Q1 is in saturation conduction state. The circuit is approximately "straight-through," and the output current of constant current source circuit 7 equals the input current, both output to lamp assembly 2 to provide operating current. When the input current of constant current source circuit 7 is greater than the rated current of lamp assembly 2, transistor Q2 conducts, and transistor Q1 exits saturation and enters the linear amplification region. The output current of transistor Q1 is limited, and the input current of constant current source circuit 7 is shunt by transistors Q1 and Q2. The larger the input current of constant current source circuit 7, the greater the conduction degree of transistor Q2, shunting more input current; the lower the conduction degree of transistor Q1, the smaller the output current, thus keeping the output current of constant current source circuit 7 constant at the rated current of lamp assembly 2. Since the current output from each circuit of the control unit to the lamp assembly 2 is the rated current of the lamp assembly 2, there is no situation where the current input to the constant current source circuit 7 is less than the rated current of the lamp assembly 2. Therefore, the constant current source circuit 7 does not need to increase the input current to the rated current of the lamp assembly 2 before outputting when the input current is less than the rated current of the lamp assembly 2.

[0030] As a further implementation of this embodiment, the lamp assembly 2 is also equipped with a light control switch 8, and the trigger switch 12 is also electrically connected to a control switch 9. The control switch 9 is electrically connected to the light control switch 8 circuit, and the light control switch 8 is electrically connected to the constant current source circuit 7. The control host 5 is connected to the control switch 9 via an electrical signal. When the operator wants the powder spray gun to perform spraying operations in a dimly lit environment, the lamp assembly 2 automatically turns on the illumination; and when performing spraying operations in a dimly lit environment, the lamp assembly 2 automatically turns off the illumination. At this time, the operator can achieve this function by controlling the control switch 6 to open and the control switch 9 to close through the control host 5. When the control switch 6 is open, current cannot flow to the lamp assembly 2 through the control switch 6. When the control switch 9 is closed, when the operator presses the trigger switch 12, the powder spray gun performs spraying operations. At this time, if the light control switch 8 senses that the ambient brightness is dim, the light control switch 8 closes and the lamp assembly 2 turns on the illumination; if the light control switch 8 senses that the ambient brightness is dim, the light control switch 8 opens and the lamp assembly 2 turns off the illumination.

[0031] As a further embodiment of this invention, the lamp assembly 2 is detachably mounted on the spray gun body 1 via a snap-fit ​​mechanism. The lamp assembly 2 includes a lamp housing 21, a lamp control circuit board 22, a light source board 23, a positive electrode terminal 24, and a negative electrode terminal 25. The lamp control circuit board 22 and the light source board 23 are installed inside the lamp housing 21 and are electrically connected. The lamp control circuit board 22 provides power to the light source board 23 and controls the light source board 23 to emit light. The front side of the lamp housing 21 has a light outlet 211, through which the light emitted by the light source board 23 is emitted to provide illumination. The bottom of the lamp housing 21 has a power connection hole 212, within which the positive electrode terminal 24 and the negative electrode terminal 25 are located. 4 and the negative terminal plate 25 are respectively connected to the lamp control circuit board 22 through the circuit; the spray gun body 1 includes a spray gun shell 13 and a terminal spring assembly 14. The spray gun shell 13 is provided with a mounting cavity 131 for installing the terminal spring assembly 14. The terminal spring assembly 14 is installed in the mounting cavity 131. The top of the spray gun shell 13 is provided with two pop-out holes 132. The top of the terminal spring assembly 14 is provided with an upwardly protruding positive terminal 141 and a negative terminal 142. The positive terminal 141 and the negative terminal 142 extend out from the two pop-out holes 132 respectively. When the lamp assembly 2 is assembled on the spray gun body 1, the positive terminal 141 contacts the positive terminal plate 24 to achieve electrical connection, and the negative terminal 142 contacts the negative terminal plate 25 to achieve electrical connection. During the installation of the lamp assembly 2 onto the spray gun body 1, the bottom of the lamp housing 21 presses the positive terminal 141 and the negative terminal 142 into the two pop-out holes 132. When the lamp assembly 2 is fully installed, the positive terminal 141 and the negative terminal 142 are directly below the connection holes 212. The lamp housing 21 does not exert downward pressure on the positive terminal 141 and the negative terminal 142. Under the action of elasticity, the positive terminal 141 and the negative terminal 142 pop out and contact the positive terminal plate 24 and the negative terminal plate 25 respectively to achieve electrical connection. When disassembling the lamp assembly 2, it can be disassembled by reverse release and disconnected from the spray gun body 1. In this embodiment, the circuit connection between the lamp assembly 2 and the spray gun body 1 can achieve a quick and convenient connection, facilitating the assembly and disassembly of the lamp assembly 2 and the spray gun body 1.

[0032] Specifically, the contact spring assembly 14 includes a movable plate 143, a telescopic column 144, a spring 145, and a telescopic guide sleeve 146. The telescopic guide sleeve 146 is fixed to the bottom of the mounting cavity 131. The telescopic guide sleeve 146 is axially fitted onto the outside of the telescopic column 144 from the bottom end. The spring 145 is axially fitted onto the outside of the telescopic column 144 from the top end. The movable plate 143 is fixed to the top end of the telescopic column 144. The two ends of the spring 145 are respectively limited by the bottom surface of the movable plate 143 and the top surface of the telescopic guide sleeve 146. The positive contact terminal 141 and the negative contact terminal 142 are both fixedly installed on the movable plate 143. The positive contact terminal 141 and the negative contact terminal 142 are respectively connected to the trigger switch 12 through a circuit. To improve the balance of the telescopic movement of the contact spring assembly 14, two or more sets of the telescopic column 144, spring 145, and telescopic guide sleeve 146 can be provided. When the positive contact terminal 141 and the negative contact terminal 142 are subjected to downward pressure, the movable plate 143 compresses the spring 145 downward, and the positive contact terminal 141, the negative contact terminal 142, the movable plate 143, and the telescopic column 144 move downward together until the positive contact terminal 141 and the negative contact terminal 142 are pressed into the two ejection holes 132, and the lamp assembly 2 can be inserted and fastened onto the spray gun body 1. When the positive terminal 141 and the negative terminal 142 are not subjected to downward pressure, under the elastic force of the spring 145, the positive terminal 141, the negative terminal 142, the movable plate 143 and the telescopic column 144 move upward together, and the positive terminal 141 and the negative terminal 142 extend out from the pop-out hole 132 and come into contact with the positive terminal plate 24 and the negative terminal plate 25 respectively.

[0033] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A powder spray gun configured with a lamp assembly, characterized in that: The device includes a spray gun body (1) and a lamp assembly (2). The lamp assembly (2) is mounted on the spray gun body (1). The spray gun body (1) is equipped with a high-voltage transformer (11) for generating high-voltage static electricity. The spray gun body (1) is equipped with a trigger switch (12) for controlling the powder spraying operation of the powder spray gun. The spray gun body (1) is connected to a powder pump (3) through a powder pipe. The powder pump (3) is connected to a powder tank (4) through a powder pipe. The trigger switch (12) is connected to a control host (5) through a circuit. The control host (5) is used to control the operation of the powder spray gun. The trigger switch (12) is connected in parallel to the high-voltage transformer (11) and the powder pump (3) through a circuit. The trigger switch (12) is connected to the lamp assembly (2) through an electric control switch (6). The electric control switch (6) and the control host (5) have a dual circuit connection of electrical signal and electrical circuit.

2. The powder spray gun with lamp assembly according to claim 1, characterized in that: A constant current source circuit (7) is also provided between the electronic control switch (6) and the lamp assembly (2). The electronic control switch (6), the constant current source circuit (7) and the lamp assembly (2) are connected in sequence through a circuit. The constant current source circuit (7) is used to provide a constant current to the lamp assembly (2).

3. A powder spray gun with a lamp assembly according to claim 2, characterized in that: The lamp assembly (2) is also provided with a light control switch (8), and the trigger switch (12) is also connected to a control switch (9). The control switch (9) is connected to the light control switch (8) circuit through a circuit. The light control switch (8) is connected to the constant current source circuit (7) through a circuit through a circuit. The control host (5) is connected to the control switch (9) through an electrical signal.

4. A powder spray gun with a lamp assembly according to claim 1, characterized in that: The lamp assembly (2) is detachably mounted on the spray gun body (1) by means of a snap fastener.

5. A powder spray gun with a lamp assembly according to claim 4, characterized in that: The lamp assembly (2) includes a lamp housing (21), a lamp control circuit board (22), a light source board (23), a positive terminal board (24), and a negative terminal board (25). The lamp control circuit board (22) and the light source board (23) are installed inside the lamp housing (21). The lamp control circuit board (22) and the light source board (23) are electrically connected. The lamp control circuit board (22) provides power to the light source board (23) and controls the light source board (23) to emit light. The front side of the lamp housing (21) is provided with a light outlet (211). The light emitted by the light source board (23) is emitted outward through the light outlet (211) to achieve illumination. The bottom of the lamp housing (21) is provided with a power connection hole (212). The positive terminal board (24) and the negative terminal board (25) are located inside the power connection hole (212). The positive terminal board (24) and the negative terminal board (25) are respectively connected to the lamp control circuit board (22) through circuits.

6. A powder spray gun with a lamp assembly according to claim 5, characterized in that: The spray gun body (1) includes a spray gun shell (13) and a contact spring assembly (14). The spray gun shell (13) has a mounting cavity (131) for installing the contact spring assembly (14). The contact spring assembly (14) is installed in the mounting cavity (131). The top of the spray gun shell (13) has two pop-out holes (132). The top of the contact spring assembly (14) has an upwardly protruding positive terminal (141) and a negative terminal (142). The positive terminal (141) and the negative terminal (142) extend out from the two pop-out holes (132). When the lamp assembly (2) is assembled on the spray gun body (1), the positive terminal (141) contacts the positive terminal plate (24) to achieve electrical connection, and the negative terminal (142) contacts the negative terminal plate (25) to achieve electrical connection.

7. A powder spray gun with a lamp assembly according to claim 6, characterized in that: The contact spring assembly (14) includes a movable plate (143), a telescopic column (144), a spring (145), and a telescopic guide sleeve (146). The telescopic guide sleeve (146) is fixed to the bottom of the mounting cavity (131). The telescopic guide sleeve (146) is axially fitted onto the outside of the telescopic column (144) from the bottom end of the telescopic column (144). The spring (145) is axially fitted onto the outside of the telescopic column (144) from the top end of the telescopic column (145). 4) On the outside, the movable plate (143) is fixed to the top of the telescopic column (144), and the two ends of the spring (145) are respectively limited by the bottom surface of the movable plate (143) and the top surface of the telescopic guide sleeve (146); the positive terminal (141) and the negative terminal (142) are both fixedly installed on the movable plate (143), and the positive terminal (141) and the negative terminal (142) are respectively connected to the trigger switch (12) through the circuit.

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