Pump built-in air plasma cutting system

Abstract

The invention discloses a pump built-in air plasma cutting system, a built-in pump in the system only provides cutting gas and does not provide cooling gas, dust diffusion caused by the cooling gas in the cutting process can be effectively reduced, and the built-in pump is small in power and size and convenient to integrate and transport. The system is more economical and environment-friendly. According to the pump built-in plasma cutting system, an air compressor is integrated into a plasma cutting power supply, cutting gas is provided for a plasma cutting gun, and a water pump is used for providing cooling liquid for the plasma cutting gun. The usage amount of compressed air is reduced, and the cooling efficiency is improved through cooling liquid. Therefore, the size of the built-in pump is reduced, and the built-in pump can be integrated into the plasma cutting power supply more easily. And the output quantity of high-pressure gas of the plasma cutting gun is reduced by 70% after the liquid is used for cooling. Therefore, dust diffusion and noise generation can be reduced.

Description

Technical Field

[0001] This invention relates to the field of cutting, and more specifically, to a pump-integrated air plasma cutting system. Background Technology

[0002] Existing pump-integrated air plasma cutting systems require both cooling and cutting air. This places high demands on the built-in pump. The need for cooling air also results in a large dust dispersion range during the cutting process. Furthermore, these systems require high-powered, bulky pumps, hindering integration. Insufficient cooling of the cutting head and nozzle reduces their lifespan. Finally, these systems generate significant noise. Summary of the Invention

[0003] To address the problems of existing technologies, this invention provides a pump-integrated air plasma cutting system. The built-in pump in this system only provides cutting gas and not cooling gas, effectively reducing dust diffusion caused by cooling gas during the cutting process. The built-in pump has a smaller power and size, facilitating integration and transportation. This system is more economical and environmentally friendly. The pump-integrated plasma cutting system integrates an air compressor into the plasma cutting power supply, providing cutting gas to the plasma cutting gun and a water pump to provide cooling liquid to the plasma cutting gun. This reduces the amount of compressed air used and improves cooling efficiency with cooling liquid. This reduces the size of the built-in pump, making it easier to integrate into the plasma cutting power supply. Using liquid cooling reduces the high-pressure gas output of the plasma cutting gun by 70%, thereby reducing dust diffusion and noise generation.

[0004] The technical solution of the present invention is: a pump-integrated air plasma cutting system, including a pump-integrated plasma cutting power supply, a pump-integrated plasma cutting gun, a cooling liquid container, a water pump, and an electrode clamp;

[0005] The pump-embedded plasma cutting power supply integrates an air compressor. The air outlet of the air compressor is connected to the "-" connection port of the pump-embedded plasma cutting power supply. One end of the gas-electric pipe of the pump-embedded plasma cutting gun is connected to the "-" connection port of the pump-embedded plasma cutting power supply, and the other end of the gas-electric pipe of the pump-embedded plasma cutting gun is connected to the gun head air inlet pipe of the gun head. The other end of the gas-electric pipe of the pump-embedded plasma cutting gun is also connected to the terminal block of the gun head. Compressed air from the air compressor enters the gun head through the gun head air inlet pipe and flows out from the eccentric small hole on the insulating component inside the gun head, forming a rotating airflow, which is finally ejected from the nozzle inside the gun head. The air compressor is controlled to provide only cutting compressed air to the pump-embedded plasma cutting gun.

[0006] The cooling liquid container contains coolant, and the water pump is installed inside the coolant. The water outlet is connected to one end of the inlet pipe of the plasma cutting gun built into the pump, and the other end of the inlet pipe of the plasma cutting gun built into the pump is connected to the inlet pipe of the gun head. The outlet pipe of the gun head is connected to one end of the outlet pipe of the plasma cutting gun built into the pump, and the other end of the outlet pipe of the plasma cutting gun built into the pump is connected to the inside of the cooling liquid container. The coolant enters the gun head through the inlet pipe of the plasma cutting gun built into the pump and the inlet pipe of the gun head, then flows out through the outlet pipe of the gun head, and then flows back to the cooling liquid container through the outlet pipe of the plasma cutting gun built into the pump, completing the cooling cycle.

[0007] Furthermore, the air inlet pipe of the gun head is connected to the air inlet of the vent hole opened on the outer copper part of the gun head, and the air outlet of the vent hole opened on the outer copper part of the gun head is located in the inner annular air chamber of the outer copper part of the gun head. The outer copper part of the gun head is fixedly sleeved on the outside of the insulating part. The inner annular air chamber of the outer copper part of the gun head corresponds to the position of the eccentric small holes evenly distributed around the bottom of the insulating part, so that the gas in the annular air chamber can flow out from the eccentric small holes on the insulating part to form a rotating airflow.

[0008] Furthermore, the external thread in the middle of the insulating component and the internal thread of the outer copper part of the gun head are screwed together, and the screwing point is filled with anti-leakage thread sealant; an anti-leakage sealing ring is installed at the small diameter end of the bottom of the insulating component, and the eccentric small hole is located between the external thread in the middle of the insulating component and the small diameter end of the bottom of the insulating component.

[0009] Furthermore, the water inlet pipe of the nozzle is connected to the water inlet of the water inlet hole opened on the outer copper part of the nozzle, and the water outlet of the water inlet hole is located in the outer annular coolant flow chamber of the outer copper part of the nozzle, which is covered by a cooling cover; the water outlet pipe of the nozzle is connected to the water outlet of the water outlet hole opened on the outer copper part of the nozzle, and the water inlet of the water outlet hole is located in the outer annular coolant flow chamber of the outer copper part of the nozzle; so that the coolant can enter the interior of the nozzle from the water inlet pipe and then flow out through the water outlet pipe.

[0010] Furthermore, the cooling cover and the outer copper part of the gun head are connected together by threads, and a leak-proof sealing ring is installed at the far end of the internal thread at the bottom of the cooling cover to prevent coolant from flowing out from the joint surface.

[0011] Furthermore, the water pump is powered separately and starts 3 seconds before the built-in plasma cutting gun is activated. This ensures that the built-in plasma cutting gun starts after the water pump is operational.

[0012] Furthermore, the power supply for the water pump is led out from the power switch output terminal of the built-in plasma cutting power supply. The water pump begins operation when the built-in plasma cutting power supply is turned on.

[0013] Furthermore, the rated operating voltage of the water pump is ≤24V.

[0014] Furthermore, the water pump is equipped with a filter at its inlet.

[0015] Furthermore, one end of the arc-starting wire in the built-in plasma cutting gun is connected to the arc-starting interface of the built-in plasma cutting power supply, and the other end of the arc-starting wire is connected to the gun head water inlet pipe. The gun head water inlet pipe is connected to the outer copper part of the gun head, and the nozzle is installed at the other end of the outer copper part of the gun head. The above path constitutes the "+" pole of the circuit required for arc starting.

[0016] One end of the copper wire in the gas cable of the plasma cutting gun built into the pump is connected to the "-" terminal interface of the plasma cutting power supply built into the pump, and the other end of the copper wire is connected to the terminal block of the gun head. The terminal block is fixed to one end of the piston rod by bolts, and an electrode is installed on the other end of the piston rod. The above path constitutes the "-" pole of the circuit required for arc initiation and cutting.

[0017] The beneficial effects of this invention are: it provides a pump-integrated air plasma cutting system. The system mainly includes a pump-integrated plasma cutting power supply, a pump-integrated plasma cutting gun, a water tank (cooling liquid container), and a water pump. The pump-integrated plasma cutting power supply integrates an air compressor into the plasma cutting power supply, providing compressed cutting gas to the plasma cutting gun. The pump-integrated plasma cutting gun includes a gun head and a cable. The gun head consists of a water inlet pipe, an air inlet pipe, a water outlet pipe, a sealing ring, a terminal block, an air chamber cover, a piston rod, insulating components, an outer copper component, a cooling cover, a spring, and screws. The cable includes an outer sheath, a gas cable, a water inlet pipe, and a water outlet pipe. Air, under the action of the built-in pump, forms high-pressure gas, which enters the air inlet pipe in the gun head through the gas inlet pipe of the cable, and then, through the vortex-forming structure inside the gun head, generates a spiral airflow, which is finally ejected from the nozzle of the plasma cutting gun head. The water pump is the power source that provides cooling liquid to the plasma cutting gun built into the pump. It delivers the coolant from the water tank to the inlet pipe of the plasma gun head inside the pump, and then through the outlet pipe of the plasma gun head into the return pipe in the cable, finally flowing back into the water tank to complete the cooling cycle.

[0018] The built-in air pump of the plasma cutting gun only supplies cutting gas to the plasma cutting gun, not cooling gas. The cooling gas requirement is approximately 3-5 times that of the cutting gas, thus reducing the power and size of the air compressor in this cutting system. This allows for easier integration of the air compressor into the plasma cutting power supply, saving costs and facilitating use and transportation. Replacing the cooling gas with a water pump-supplied cooling liquid results in significantly improved cooling performance; liquid cooling is 5 to 10 times more efficient than air cooling. The noise level is also greatly reduced, effectively lowering operating costs and making the system more environmentally friendly. Furthermore, eliminating the need for cooling gas effectively solves the problem of insufficient air pressure in traditional pump-driven cutting power supplies, which can lead to reduced cutting capacity. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of the pump-integrated air plasma cutting system;

[0020] Figure 2(a) is a top view of the gun head;

[0021] Figure 2(b) is a cross-sectional view along the AA direction in Figure 2(a);

[0022] Figure 2(c) is a cross-sectional view along the CC direction in Figure 2(a);

[0023] Figure 3 Schematic diagram of the piston rod of the air plasma cutting gun head built into the pump;

[0024] Figure 4 Schematic diagram of the insulating component of the air plasma cutting gun head built into the pump;

[0025] Figure 5 A schematic diagram of the outer copper part of the air plasma cutting torch head built into the pump.

[0026] In the picture:

[0027] symbol name symbol name 1 Pump with built-in plasma cutting gun 2 The pump has a built-in plasma cutting power supply. 3 bucket 4 water pump 5 Electrode clip 6 nozzle inlet pipe 7 quick connector 8 nozzle water pipe 9 air intake tube of the gun head 10 Terminal blocks 11 nozzle 12 bolt 13 Leak-proof sealing ring 14 Cooling shroud 15 Leak-proof sealing ring 16 outer copper parts of the gun head 17 external nozzle 18 Insulating components 19 sealing ring 20 Piston rod 21 spring 22 Air chamber cover 23 bolt 101 outer skin 102 Pneumatic tube 103 control lines 104 Arc 105 water outlet pipe 106 Inlet pipe 107 spearhead 108 switch 201 air compressor 161 Vent 162 Water inlet 163 Water outlet Detailed Implementation

[0028] The following describes specific embodiments of a pump-embedded air plasma cutting system according to the present invention. These embodiments are only a few examples of the embodiments of the present invention. All embodiments involved in this invention are within the protection scope of the claims of this invention.

[0029] like Figure 1 As shown, the pump-built-in air plasma cutting system mainly includes: a pump-built-in plasma cutting power supply 2, a pump-built-in plasma cutting gun 1, a water tank 3 (cooling liquid container), a water pump 4, and an electrode clamp 5. The pump-built-in plasma cutting gun 1 includes: an outer casing 101, an air-electric pipe 102, a control line 103, an arc-starting line 104, a water outlet pipe 105, a water inlet pipe 106, a gun head 107, and a switch 108.

[0030] The "control" port of the built-in plasma cutting power supply 2 is connected to one end of the control line 103 of the built-in plasma cutting gun 1, and the other end of the control line 103 is connected to the switch 108 of the built-in plasma cutting gun 1.

[0031] One end of the arc-starting wire 104 in the built-in plasma cutting gun 1 is connected to the arc-starting interface of the built-in plasma cutting power supply 2, and the other end of the arc-starting wire 104 is connected to the gun head water inlet pipe 6 of the gun head 107. The gun head water inlet pipe 6 is connected to the gun head outer copper part 16, and the nozzle 11 is installed at the other end of the gun head outer copper part 16. The above path constitutes the "+" pole of the circuit required for arc starting.

[0032] One end of the copper wire in the gas cable of the built-in plasma cutting gun 1 is connected to the "-" terminal interface of the built-in plasma cutting power supply 2, and the other end of the copper wire is connected to the terminal 10 of the gun head 107. The terminal 10 is fixed to one end of the piston rod 20 by bolts 23, and the other end of the piston rod 20 is equipped with an electrode 12. The above path constitutes the "-" pole of the circuit required for arc initiation and cutting.

[0033] like Figure 2a , Figure 2b , Figure 2c As shown, the nozzle 107 includes: a nozzle inlet pipe 6, a quick connector 7, a terminal block 10, a nozzle outlet pipe 8, a nozzle air inlet pipe 9, a nozzle 11, an electrode 12, a leak-proof sealing ring 13, a cooling cover 14, a leak-proof air sealing ring 15, and so on. Figure 5 The gun head outer copper part 16 and outer nozzle 17 shown are as follows: Figure 4 The insulating component 18 and sealing ring 19 shown are as follows: Figure 3 The piston rod 20, spring 21, air chamber cover 22, and bolt 23 are shown.

[0034] The spring 21 is fitted onto the piston rod 20, with one end contacting the inner end face of the air chamber cover and the other end contacting the outer stepped surface of the piston rod 20. The spring 21 is a compression spring, providing reset energy for the piston rod 20. One end of the piston rod 20 is hexagonal, engaging with the hexagonal hole of the air chamber cover 22 to prevent rotation of the piston rod 20. The internal thread of the insulating component 18 is screwed into the external thread of the air chamber cover and secured with thread-locking adhesive. One end of the insulating component 18 has evenly distributed eccentric holes to form a rotating airflow. One end of the piston rod 20 has a central hole with radial holes communicating with it at both ends. Compressed air passes through the above path, entering the air chamber formed by the insulating component 18, the piston rod 20, and the sealing ring 15, pushing the piston rod 20 to move axially. The terminal 10 is fixed to the piston rod 20 by bolts 23. The electrode 7 is threaded onto the piston rod 20. The nozzle 11 is threaded onto the outer copper part 16 of the nozzle head. The outer nozzle 17 is threaded onto the outer copper part 16.

[0035] The built-in plasma cutting power supply 2 integrates an air compressor 201. The air outlet of the air compressor 201 is connected to the "-" connection port of the built-in plasma cutting power supply 2. One end of the gas-electric pipe 102 of the built-in plasma cutting gun 1 is connected to the "-" connection port of the built-in plasma cutting power supply 2, and the other end of the gas-electric pipe 102 of the built-in plasma cutting gun 1 is connected to the gun head air inlet pipe 9 of the gun head 107 of the built-in plasma cutting gun 1. At the same time, the other end of the gas-electric pipe 102 of the built-in plasma cutting gun 1 is also connected to the terminal 10 of the gun head 107. The compressed air from the air compressor 201 enters the gun head 107 through the gun head air inlet pipe 9, and flows out from the eccentric small hole on the insulating part 18 inside the gun head 107 to form a rotating airflow, which is finally ejected from the nozzle 11 inside the gun head 107. The air compressor 201 is controlled to supply only cutting compressed air to the built-in plasma cutting gun 1.

[0036] Specifically, the air inlet pipe 9 of the gun head is connected to the air inlet of the vent hole 161 on the outer copper part 16 of the gun head. The air outlet of the vent hole 161 on the outer copper part 16 of the gun head is located in the annular air chamber inside the outer copper part 16 of the gun head. The outer copper part 16 of the gun head is fixedly sleeved on the outside of the insulating part 18. The annular air chamber inside the outer copper part 16 of the gun head corresponds to the position of the eccentric small holes evenly distributed around the bottom of the insulating part 18, so that the gas in the annular air chamber can flow out from the eccentric small holes on the insulating part 18 to form a rotating airflow. The external thread in the middle of the insulating part 18 and the internal thread of the outer copper part 16 of the gun head are screwed together, and the screw joint is filled with anti-leakage thread sealant. An anti-leakage sealing ring 15 is installed at the small diameter end of the bottom of the insulating part 18, and the eccentric small hole is located between the external thread in the middle of the insulating part 18 and the small diameter end of the bottom of the insulating part 18.

[0037] The water tank 3 contains coolant, and the water pump 4 is located within the coolant. The outlet of the water pump 4 is connected to one end of the inlet pipe 106 of the plasma cutting gun 1 built into the pump. The other end of the inlet pipe 106 of the plasma cutting gun 1 built into the pump is connected to the gun head inlet pipe 6 via a quick connector 7. The gun head outlet pipe 8 is connected to one end of the outlet pipe 105 of the plasma cutting gun 1 built into the pump. The other end of the outlet pipe 105 of the plasma cutting gun 1 built into the pump is connected to the interior of the water tank 3. The coolant enters the gun head through the inlet pipe 106 of the plasma cutting gun 1 built into the pump and the inlet pipe 6 of the gun head, then flows out through the outlet pipe 8 of the gun head, and then flows back to the water tank 3 through the outlet pipe 105 of the plasma cutting gun 1 built into the pump, completing the cooling cycle.

[0038] Specifically, the nozzle inlet pipe 6 is connected to the inlet of the inlet hole 162 on the outer copper part 16 of the nozzle. The outlet of the inlet hole 162 is located in the outer annular coolant flow chamber of the outer copper part 16 of the nozzle. A cooling cover 14 surrounds the outer annular coolant flow chamber of the outer copper part 16 of the nozzle. The nozzle outlet pipe 8 is connected to the outlet of the outlet hole 163 on the outer copper part 16 of the nozzle. The inlet of the outlet hole 163 is located in the outer annular coolant flow chamber of the outer copper part 16 of the nozzle. This allows coolant to enter the nozzle from the nozzle inlet pipe 6 and then flow out through the nozzle outlet pipe 8. The cooling cover 14 and the outer copper part 16 of the nozzle are connected together by threads. A leak-proof sealing ring 13 is installed at the far end of the internal thread at the bottom of the cooling cover 14 to prevent coolant from flowing out from the joint surface.

[0039] In this embodiment, the power supply for the water pump 4 can be provided separately, and the water pump 4 is started 3 seconds before the built-in plasma cutting gun 1 is started. This ensures that the built-in plasma cutting gun starts after the water pump is running. Alternatively, the power supply for the water pump 4 can be led out from the power switch output terminal of the built-in plasma cutting power supply 2. When the built-in plasma cutting power supply is turned on, the water pump starts working.

[0040] The rated operating voltage of the water pump 4 is ≤24V. The water inlet of the water pump 4 is equipped with a filter device.

[0041] The built-in air pump of the plasma cutting gun only supplies cutting gas to the plasma cutting gun, not cooling gas. The cooling gas requirement is approximately 3-5 times that of the cutting gas, thus reducing the power and size of the air compressor in this cutting system. This allows for easier integration of the air compressor into the plasma cutting power supply, saving costs and facilitating use and transportation. Replacing the cooling gas with a water pump-supplied cooling liquid results in significantly improved cooling performance; liquid cooling is 5 to 10 times more efficient than air cooling. The noise level is also greatly reduced, effectively lowering operating costs and making the system more environmentally friendly. Furthermore, eliminating the need for cooling gas effectively solves the problem of insufficient air pressure in traditional pump-driven cutting power supplies, which can lead to reduced cutting capacity.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. The pump has a built-in air plasma cutting system, characterized in that: It includes a built-in plasma cutting power supply (2), a built-in plasma cutting gun (1), a cooling liquid container (3), a water pump (4), and an electrode clamp (5). The built-in plasma cutting power supply (2) of the pump integrates an air compressor (201). The air outlet of the air compressor (201) is connected to the "-" connection port of the built-in plasma cutting power supply (2). One end of the gas-electric pipe (102) of the built-in plasma cutting gun (1) is connected to the "-" connection port of the built-in plasma cutting power supply (2). The other end of the gas-electric pipe (102) of the built-in plasma cutting gun (1) is connected to the air inlet pipe (9) of the gun head (107) of the built-in plasma cutting gun (1). The air compressor (201) is connected to the plasma cutting gun (1) built into the pump, and the other end of the air-electric pipe (102) is also connected to the terminal (10) of the gun head (107); the compressed air of the air compressor (201) enters the gun head (107) through the gun head air inlet pipe (9), and flows out from the eccentric small hole on the insulator (18) inside the gun head (107) to form a rotating airflow, which is finally sprayed out from the nozzle (11) inside the gun head (107); the air compressor (201) is controlled to provide only cutting compressed air to the plasma cutting gun (1) built into the pump; The cooling liquid container (3) contains coolant, and the water pump (4) is installed in the coolant. The outlet of the water pump (4) is connected to one end of the inlet pipe (106) of the plasma cutting gun (1) built into the pump, and the other end of the inlet pipe (106) of the plasma cutting gun (1) built into the pump is connected to the nozzle inlet pipe (6). The nozzle outlet pipe (8) is connected to one end of the outlet pipe (105) of the plasma cutting gun (1) built into the pump, and the other end of the outlet pipe (105) of the plasma cutting gun (1) built into the pump is connected to the interior of the cooling liquid container (3). The coolant enters the interior of the nozzle through the inlet pipe (106) of the plasma cutting gun (1) built into the pump and the nozzle inlet pipe (6), then flows out through the nozzle outlet pipe (8), and then flows back to the cooling liquid container (3) through the outlet pipe (105) of the plasma cutting gun (1) built into the pump, thus completing the cooling cycle.

2. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The air inlet pipe (9) of the gun head is connected to the air inlet of the air vent (161) opened on the outer copper part (16) of the gun head. The air outlet of the air vent (161) opened on the outer copper part (16) of the gun head is located in the inner annular air chamber of the outer copper part (16) of the gun head. The outer copper part (16) of the gun head is fixedly sleeved on the outside of the insulating part (18). The inner annular air chamber of the outer copper part (16) of the gun head corresponds to the position of the eccentric small holes evenly distributed around the bottom of the insulating part (18), so that the gas in the annular air chamber can flow out from the eccentric small holes on the insulating part (18) to form a rotating airflow.

3. The pump-embedded air plasma cutting system according to claim 2, characterized in that: The external thread in the middle of the insulating part (18) and the internal thread of the outer copper part (16) of the gun head are screwed together, and the screwing point is filled with anti-leakage thread sealant; an anti-leakage sealing ring (15) is installed at the small diameter end of the bottom of the insulating part (18), and the eccentric small hole is located between the external thread in the middle of the insulating part (18) and the small diameter end of the bottom of the insulating part (18).

4. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The nozzle inlet pipe (6) is connected to the inlet of the inlet hole (162) on the outer copper part (16) of the nozzle. The outlet of the inlet hole (162) is located at the outer annular coolant flow chamber of the outer copper part (16) of the nozzle. The outer annular coolant flow chamber of the outer copper part (16) of the nozzle is covered by a cooling cover (14). The nozzle outlet pipe (8) is connected to the outlet of the outlet hole (163) on the outer copper part (16) of the nozzle. The inlet of the outlet hole (163) is located at the outer annular coolant flow chamber of the outer copper part (16) of the nozzle. This allows the coolant to enter the nozzle from the nozzle inlet pipe (6) and then flow out through the nozzle outlet pipe (8).

5. The pump-embedded air plasma cutting system according to claim 4, characterized in that: The cooling cover (14) and the outer copper part (16) of the gun head are connected together by threads, and a water-proof sealing ring (13) is installed at the far end of the inner thread at the bottom of the cooling cover (14).

6. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The water pump (4) is powered separately and is started before the plasma cutting gun (1) inside the pump is started.

7. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The power supply for the water pump (4) is drawn from the power switch output terminal of the built-in plasma cutting power supply (2) of the pump.

8. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The rated operating voltage of the water pump (4) is ≤24V.

9. The pump-embedded air plasma cutting system according to claim 1, characterized in that: The water pump (4) is equipped with a filter at its inlet.

10. The pump-embedded air plasma cutting system according to claim 1, characterized in that: One end of the arc-starting wire (104) in the built-in plasma cutting gun (1) is connected to the arc-starting interface of the built-in plasma cutting power supply (2), and the other end of the arc-starting wire (104) is connected to the gun head water inlet pipe (6) of the gun head (107). The gun head water inlet pipe (6) is connected to the gun head outer copper part (16). The nozzle (11) is installed at the other end of the gun head outer copper part (16). The above path constitutes the "+" pole of the circuit required for arc starting. One end of the copper wire in the gas cable of the built-in plasma cutting gun (1) is connected to the "-" end interface of the built-in plasma cutting power supply (2), and the other end of the copper wire is connected to the terminal (10) of the gun head (107). The terminal (10) is fixed to one end of the piston rod (20) by bolts (23), and the other end of the piston rod (20) is equipped with an electrode (12). The above path constitutes the "-" pole of the circuit required for arc initiation and cutting.

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