Detachable springback-free plasma cutting gun head

Abstract

The invention discloses a detachable springback-free plasma cutting gun head. The gun head is assembled and formed through mechanical structures of all parts, installation is convenient, disassembly is easy, and the gun head can be maintained. On the other hand, the gun head is matched through a mechanical structure and is not interfered by an uncertain factor, namely external injection molding pressure, the precision of the gun head is more accurate, and the cutting quality is higher; on the other hand, due to dual protection of the insulating cover and the heat shrink tube, the distance between the positive electrode and the negative electrode of the gun head is very long, and the possibility of short-circuit ignition is eradicated; and on the other hand, a step surface which can be in contact with an electrode plane is arranged in the copper piece in the gun head, so that the electric contact area of the accessory is larger, and the service life of the accessory is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ion cutting, and more particularly to a detachable non-rebound plasma cutting gun head. Background Art

[0002] The plasma cutting gun head commonly used in the prior art is made of injection-molded bakelite to connect various parts together. It cannot be disassembled after injection molding, and the gun head cannot be repaired if it is damaged. The pressure generated during the injection molding of bakelite will squeeze and deform the internal parts of the gun head, resulting in reduced cutting accuracy. At the same time, it is also impossible to ensure that the injection-molded bakelite is free of pores or cracks, which may cause short circuit and burning of the gun head. In addition, the copper parts and electrodes in the gun head are connected only by cross groove clamping, which has a small contact area and high resistance. It is easy to get hot after power is turned on, thereby shortening the service life of the accessories. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a detachable rebound-free plasma cutting gun head, which is assembled and formed by the mechanical structure of various parts, is easy to install, simple to disassemble, and can be repaired; on the other hand, the gun head is more precise and has higher cutting quality through the coordination of the mechanical structure and is not affected by the uncertain factor of external injection molding pressure; on the other hand, due to the double protection of the insulating cover and the heat shrink tube, the positive and negative poles of the gun head are very far apart, eliminating the possibility of short circuit and sparking; on another hand, a step surface that can contact the electrode plane is built into the copper part of the gun head, so that the electrical contact area of ​​the accessory is larger, thereby extending the service life of the accessory.

[0004] The technical solution of the present invention is: a detachable non-rebound plasma cutting gun head, comprising an insulating member, a support seat, a connecting member, an inner copper member, an insulating cover, a copper air pipe, a heat shrink tube, an arc-starting wire, a first sealing ring and a second sealing ring;

[0005] The support seat is a cylindrical part made of conductive material, the center of the support seat is a support seat step through hole that is thin at the proximal end and thick at the distal end, the step surface in the middle of the support seat step through hole is the step surface of the support seat inner hole; the distal end of the support seat step through hole has an O-ring groove in the support seat, and the support seat step through hole between the O-ring groove in the support seat and the step surface of the support seat inner hole is provided with a plurality of penetrating support seat radial small holes; an eccentric support seat axial eccentric hole is provided on the proximal end face of the support seat, the support seat axial eccentric hole does not interfere with the support seat step through hole, the arc starting wire is connected to the support seat axial eccentric hole, and is pressed or welded; the arc starting wire terminal is crimped to the other end of the arc starting wire.

[0006] The connector is a cylindrical part made of insulating material, the center of the connector is a connector through hole, the proximal end of the connector through hole is a connector internal thread, the outer circle of the connector is composed of three sections: the distal end is the connector external thread, the middle section is the connector smooth round surface, and the proximal end is the connector milling flat structure; the diameter of the connector smooth round surface is smaller than the minimum inner hole diameter of the support seat step through hole, and the maximum radial length of the connector milling flat structure is greater than the minimum inner hole diameter of the support seat step through hole; a connector step surface is formed between the connector smooth round surface and the connector milling flat structure;

[0007] The insulating part is a cylindrical part made of insulating material, the outer circle of the insulating part is a step-like structure of the insulating part with a thin proximal end and a thick distal end, the proximal end of the outer circle of the thick diameter section of the insulating part has an insulating part annular groove, and a plurality of insulating part axial small holes are distributed on the distal end surface of the insulating part, the insulating part axial small holes are connected to the distal end surface of the insulating part and the insulating part annular groove, and the insulating part axial small holes shall not interfere with the insulating part O-ring groove;

[0008] The inner hole of the insulating member is an insulating member through hole, and the insulating member through hole is, from the far end to the near end, an insulating member inner step surface, an insulating member far end annular groove, an insulating member near end annular groove and an insulating member inner thread in sequence;

[0009] The diameter of a section with a thinner outer diameter of the insulating member is smaller than the minimum inner diameter of the step through hole of the support seat, and the diameter of a section with a thicker outer diameter of the insulating member is smaller than the maximum inner diameter of the step through hole of the support seat, the inner thread of the insulating member just matches the outer thread of the connecting member, and a plurality of radial holes of the insulating member are distributed on the annular groove at the distal end of the insulating member, and the radial holes of the insulating member shall not interfere with the axial holes of the insulating member, and the inner step surface of the insulating member shall not interfere with the axial holes of the insulating member;

[0010] The insulating member and the connecting member pass through the step through hole of the supporting seat from both ends of the supporting seat, and are connected by the external thread of the connecting member and the internal thread of the insulating member, until the outer circular step surface of the insulating member abuts against the step surface of the inner hole of the supporting seat, and the step surface of the connecting member abuts against the proximal end surface of the supporting seat, thereby pressing the supporting seat;

[0011] The first sealing ring is located in the O-ring groove in the support seat and is pressed by the outer cylindrical surface of the insulating member to play a sealing role;

[0012] The inner copper part is an axial part made of conductive material, the proximal end of the central inner copper part through hole of the inner copper part is an inner copper part internal thread, the proximal outer surface of the inner copper part is a milled inner copper part, an inner copper part O-ring groove is provided in the middle of the outer surface of the inner copper part, an inner copper part external thread is provided between the milled inner copper part and the inner copper part O-ring groove, the maximum radial dimension of the milled inner copper part structure is larger than the inner hole dimension of the proximal end of the connector, the inner copper part is inserted from the through hole of the connector, and is connected to the inner copper part external thread and the connector internal thread by the inner copper part external thread, until the step surface of the milled inner copper part structure fits with the proximal end surface of the proximal end of the connector;

[0013] The second sealing ring is located in the O-ring groove of the inner copper part and is pressed by the inner circular surface of the connecting part to play a sealing role;

[0014] The copper air pipe is a tubular part made of conductive material, and one end of the copper air pipe has an external copper air pipe thread, and the external copper air pipe thread is connected to the internal thread of the inner copper part;

[0015] The heat shrinkable tube is an insulating part that can shrink when heated, and is sleeved on the copper air pipe, with one end of the heat shrinkable tube supporting the proximal end surface of the inner copper part;

[0016] The insulating cover is a part made of insulating material, which covers the milled flat structure of the inner copper part, and the inner hole of the insulating cover presses the heat shrink tube tightly.

[0017] Furthermore, the inner diameter of the proximal annular groove of the insulating member is larger than the diameter of the through hole of the connecting member;

[0018] The inner copper part has an inner copper part inner step surface near the inner hole at the far end, and the far end of the inner copper part is an axial inner copper part cross groove structure;

[0019] The claw is made of wear-resistant material and has a certain resilience, and the claw is provided with an axial claw cross groove structure;

[0020] The number and width of the axial grooves of the claw cross groove of the claw and the inner copper cross groove of the inner copper part are consistent, and the claw shall not fall off after being connected to the middle part of the distal end of the inner copper part;

[0021] After the inner copper piece passes through the through hole of the connecting piece, the clamping claw will be located in the annular groove at the proximal end of the insulating piece to play a role in restraining rebound.

[0022] Furthermore, there is an outer O-ring groove of the support seat on the outer circle of the distal end of the radial hole of the support seat; the third sealing ring is located in the outer O-ring groove of the support seat, and is used to prevent leakage of cooling gas when assembling the outer nozzle.

[0023] Furthermore, an insulating O-ring groove is provided at the far end of the outer circle of the thick diameter section insulating part; a fourth sealing ring is located in the insulating O-ring groove and is used to prevent leakage of plasma cutting gas when assembling the arc starter.

[0024] Furthermore, the inner diameter of the proximal annular groove of the insulating member is larger than the diameter of the through hole of the connecting member;

[0025] The inner hole diameter at the distal end of the inner copper part is smaller than the step inner hole diameter of the proximal annular groove of the insulating part, ensuring that the electrode can contact the surface of the inner copper part. The outer cylindrical surface at the distal end of the inner copper part fits with the inner hole surface at the distal end of the connecting part to ensure concentricity. The drum spring is located in the proximal annular groove of the insulating part to clamp the electrode.

[0026] The beneficial effects of the present invention are as follows: providing a detachable rebound-free plasma cutting gun head, which is assembled and formed by the mechanical structures of various parts, is easy to install, simple to disassemble, and can be repaired; on the other hand, the gun head is more precise and has higher cutting quality through the cooperation of the mechanical structure and is not affected by the uncertain factor of external injection molding pressure; on the other hand, due to the double protection of the insulating cover and the heat shrink tube, the positive and negative poles of the gun head are very far apart, eliminating the possibility of short circuit and sparking; on another hand, a step surface that can contact the electrode plane is built into the copper part of the gun head, so that the electrical contact area of ​​the accessory is larger, thereby extending the service life of the accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a plasma cutting gun head using the present invention.

[0028] Figure 2 It is a cross-sectional view of a plasma cutting gun head and consumable parts using the present invention.

[0029] Figure 3 It is a schematic diagram of gas flow using the plasma cutting gun head of the present invention.

[0030] Figure 4 The figure is an exploded view of a plasma cutting gun head using the present invention.

[0031] Figure 5 It is a cross-sectional view of a cutting gun head using the second embodiment of the present invention.

[0032] in:

[0033] 1-Insulation 2-Claw 3-Support seat

[0034] 4-Connector 5-Inner copper part 6-Insulation cover

[0035] 7-Copper air pipe 8-Heat shrink tube 9-Arc starter wire

[0036] 10-arc-starting wire terminal 11-fourth sealing ring 12-first sealing ring

[0037] 13- third sealing ring 14- second sealing ring 15- electrode

[0038] 16-arc starter 17-nozzle 18-external nozzle

[0039] 19-protection cap 20-inner hole of copper air pipe 21-inner hole of inner copper part

[0040] 22-electrode inner hole 23-electrode radial small hole 24-insulator radial small hole 25-first air chamber 26-arc starter air inlet 27-second air chamber

[0041] 28-arc starter outlet 29-third air chamber 30-axial small hole of insulating part 31- fourth air chamber 32- radial small hole of support seat 33- nozzle cooling hole

[0042] 34-fifth air chamber 35-center hole of protective cap 36-swirl hole of nozzle

[0043] 37-sixth air chamber 38-center hole of nozzle 39-proximal end surface of support seat 40-step surface of inner hole of support seat 41-external thread of copper air pipe 42-O-ring groove in support seat 43- O-ring groove outside the support seat 44- axial eccentric hole of the support seat 45- internal thread of the connecting piece

[0044] 46- step surface of connector 47- round surface of connector 48- external thread of connector

[0045] 49- milling flat structure of connector 50- annular groove of insulator 51- O-ring groove of insulator

[0046] 52-claw cross groove 53-insulating part inner step surface 54-insulating part distal end annular groove

[0047] 55- annular groove at the proximal end of the insulator 56- internal thread of the insulator 57- internal thread of the internal copper part

[0048] 58-Inner step surface of inner copper part 59-Cross groove of inner copper part 60-Milling flat of inner copper part

[0049] 61-internal copper part external thread 62-internal copper part O-ring groove 63-drum spring

[0050] 64-Another example of inner copper part 65-Outer circular step surface of insulating part 66-Milling flat step surface of inner copper part DETAILED DESCRIPTION

[0051] Embodiment 1

[0052] The plasma cutting gun head of the present invention is further described in detail with reference to the accompanying drawings.

[0053] The plasma cutting gun head of the present invention is a detachable non-rebound plasma cutting gun head, which is convenient to maintain and has better insulation performance. The rebound mechanism is not inside the gun head, and the cutting accuracy is better.

[0054] like Figure 1 As shown, a detachable rebound-free plasma cutting gun head includes an insulating part 1, a clamping claw 2, a supporting seat 3, a connecting part 4, an inner copper part 5, an insulating cover 6, a copper air pipe 7, a heat shrink tube 8, an arc starting wire 9, an arc starting wire terminal 10, a first sealing ring 12, a second sealing ring 14, a third sealing ring 13 and a fourth sealing ring 14.

[0055] like Figure 2 As shown, the support seat 3 is a cylindrical part made of conductive material. The center of the support seat 3 is a support seat step through hole that is thin at the proximal end and thick at the distal end. The step surface in the middle of the support seat step through hole is the support seat inner hole step surface 40. There is an O-ring groove 42 in the support seat at the distal end of the support seat step through hole. A plurality of penetrating support seat radial small holes 32 are provided in the support seat step through hole between the O-ring groove 42 in the support seat and the support seat inner hole step surface 40. An eccentric support seat axial eccentric hole 44 is provided on the support seat proximal end face 39 of the support seat 3. The support seat axial eccentric hole 44 does not interfere with the support seat step through hole. The arc-starting wire 9 is connected in the support seat axial eccentric hole 44 and is pressed or welded. The arc-starting wire terminal 10 is crimped to the other end of the arc-starting wire 9.

[0056] The connector 4 is a cylindrical part made of insulating material, the center of the connector 4 is a connector through hole, the proximal end of the connector through hole is a connector internal thread 45, and the outer circle of the connector 4 is composed of three sections: the distal end is a connector external thread 48, the middle section is a connector smooth round surface 47, and the proximal end is a connector milling flat structure 49. The diameter of the connector smooth round surface 47 is smaller than the minimum inner hole diameter of the support seat step through hole, and the maximum radial length of the connector milling flat structure 49 is greater than the minimum inner hole diameter of the support seat step through hole. A connector step surface 46 is formed between the connector smooth round surface 47 and the connector milling flat structure 49.

[0057] The insulating part 1 is a cylindrical part made of insulating material. The outer circle of the insulating part 1 is a stepped structure of the insulating part that is thin at the proximal end and thick at the distal end. The proximal end of the outer circle of the thick diameter section of the insulating part has an insulating part annular groove 50, and a plurality of insulating part axial holes 30 are distributed on the distal end surface of the insulating part 1. The insulating part axial holes 30 connect the distal end surface of the insulating part 1 and the insulating part annular groove 50, and the insulating part axial holes 30 shall not interfere with the insulating part O-ring groove 51.

[0058] The inner hole of the insulating member 1 is an insulating member through hole, and the insulating member through hole comprises, from the far end to the near end, an insulating member inner step surface 53, an insulating member far end annular groove 54, an insulating member near end annular groove 55 and an insulating member inner thread 56.

[0059] The diameter of a section with a thinner outer diameter of the insulating part 1 is smaller than the minimum inner hole diameter of the step through hole of the support seat, and the diameter of a section with a thicker outer diameter of the insulating part 1 is smaller than the maximum inner hole diameter of the step through hole of the support seat. The inner thread 56 of the insulating part just matches with the outer thread 48 of the connecting part. A plurality of radial holes 24 of the insulating part are distributed on the annular groove 54 at the distal end of the insulating part. The radial holes 24 of the insulating part shall not interfere with the axial holes 30 of the insulating part, and the inner step surface 53 of the insulating part shall not interfere with the axial holes 30 of the insulating part.

[0060] The insulating member 1 and the connecting member 4 pass through the support seat step through hole from both ends of the support seat 3 and are connected through the connecting member external thread 48 and the insulating member internal thread 56 until the outer cylindrical step surface of the insulating member 1 abuts against the support seat inner hole step surface 40 and the connecting member step surface 46 abuts against the support seat proximal end surface 39, thereby pressing the support seat.

[0061] The first sealing ring 12 is located in the O-ring groove 42 in the support seat and is pressed by the outer circumferential surface of the insulating member 1 to perform a sealing function.

[0062] The inner copper part 5 is an axial part made of conductive material, and the proximal end of the central inner copper part through hole of the inner copper part 5 is the inner copper part internal thread 57, and the proximal outer surface of the inner copper part 5 is the inner copper part milling flat 60. There is an inner copper part O-ring groove 62 in the middle of the outer surface of the inner copper part 5, and an inner copper part external thread 62 is provided between the inner copper part milling flat 60 and the inner copper part O-ring groove 62. The maximum radial dimension of the inner copper part milling flat 60 structure is larger than the inner hole dimension of the proximal end of the connector 4, and the inner copper part 5 is inserted from the connector through hole and is connected to the connector internal thread 45 through the inner copper part external thread 62 until the step surface of the inner copper part milling flat 60 structure fits with the proximal end face of the proximal end of the connector 4.

[0063] The second sealing ring 14 is located in the inner copper O-ring groove 62 and is pressed by the inner circular surface of the connecting member 4 to perform a sealing function.

[0064] The copper air pipe 7 is a tubular part made of conductive material. One end of the copper air pipe 7 is provided with a copper air pipe external thread 41 , and the copper air pipe external thread 41 is connected to the internal copper part internal thread 57 .

[0065] The heat shrink tube 8 is an insulating member that can shrink when heated and is sleeved on the copper air pipe 7 , with one end of the heat shrink tube 8 supporting the proximal end surface of the inner copper member 5 .

[0066] The insulating cover 6 is a part made of insulating material, covering the inner copper part milling flat 60 structure, and the inner hole of the insulating cover 6 presses the heat shrink tube 8 tightly.

[0067] The inner diameter of the proximal annular groove 55 of the insulating part is larger than the diameter of the through hole of the connecting part. The inner hole of the inner copper part 5 near the distal end has an inner copper part inner step surface 58, and the distal end of the inner copper part 5 is an axial inner copper part cross groove 59 structure. The claw 2 is made of wear-resistant material and has a certain resilience. The claw 2 has an axial claw cross groove 52 structure. The number and width of the axial grooves of the claw cross groove 52 of the claw 2 and the inner copper part cross groove 59 of the inner copper part 5 are consistent, and the claw 2 shall not fall off after being connected to the middle of the distal end of the inner copper part 5. After the inner copper part 5 is inserted from the through hole of the connecting part, the claw 2 will be in the proximal annular groove 55 of the insulating part to play a role in restraining rebound.

[0068] There is a support seat outer O-ring groove 43 on the outer circle of the distal end of the support seat radial small hole 32. The third sealing ring 13 is located in the support seat outer O-ring groove 43 and is used to prevent leakage of cooling gas when assembling the outer nozzle.

[0069] The far end of the outer circle of the thick diameter section insulating member has an insulating member O-ring groove 51. The fourth sealing ring 11 is located in the insulating member O-ring groove 51 and is used to prevent leakage of plasma cutting gas when assembling the arc starter.

[0070] like Figure 3 , 4 As shown, the consumable parts of a detachable non-rebound plasma cutting gun head include: an electrode 15, an arc starter 16, a nozzle 17, an outer nozzle 18 and a protective cap 19.

[0071] The chamber between the outer nozzle 18 and the insulating part 1, the arc starter 16 and the nozzle 17 is the first air chamber 25, there is a movable chamber inside the arc starter 16 as the second air chamber 27, the chamber between the electrode 15 and the arc starting tube is the third air chamber, the chamber between the support seat 3 and the insulating part 1 is the fourth air chamber, the chamber between the nozzle 17 and the protective cap 19 is the fifth air chamber 34, and the chamber between the electrode 15 and the nozzle 17 is the sixth chamber.

[0072] like Figure 4As shown, the total airflow enters from the inner hole 20 of the copper air pipe, passes through the inner hole 21 of the inner copper part and the inner hole 22 of the electrode, enters the first air chamber 25 through the radial holes 23 of the electrode and the radial holes 24 of the insulating part, and then is divided into three airflows: one is the front cooling airflow, which enters the fifth air chamber 34 from the nozzle cooling air hole 33, and then blows out from the central hole 35 of the protective cap. One is the rear cooling airflow, which enters the second air chamber 27 from the arc starter air inlet 26, at which time the piston inside the arc starter 16 rebounds to trigger the arc, and then the airflow flows into the third air chamber 29 through the arc starter air outlet 28, and then flows into the fourth air chamber 31 through the axial hole 30 of the insulating part, and finally flows out of the outside of the gun head through the radial holes 32 of the support seat. Another one is the cutting airflow, which rotates from the nozzle vortex hole 36 to enter the sixth air chamber 37, and then blows out the plasma arc from the central hole 38 of the nozzle.

[0073] Embodiment 2

[0074] like Figure 5 As shown, in this embodiment, the inner copper part 64 may not have a cross groove structure, and the distal inner hole diameter of the inner copper part 64 is smaller than the step inner hole diameter of the proximal annular groove 55 of the insulating part, ensuring that the electrode can contact the surface of the inner copper part. In this embodiment, the distal outer cylindrical surface of the inner copper part 64 fits with the distal inner hole surface of the connecting part 4 to ensure concentricity, and the claw 2 is replaced by a drum spring 63, which is located in the proximal annular groove 55 of the insulating part to tighten the electrode.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A detachable non-rebound plasma cutting gun head, characterized in that: It comprises an insulating part (1), a supporting seat (3), a connecting part (4), an inner copper part (5), an insulating cover (6), a copper air pipe (7), a heat shrink tube (8), an arc-starting wire (9), a first sealing ring (12) and a second sealing ring (14); The support seat (3) is a cylindrical part made of conductive material, the center of the support seat (3) is a support seat step through hole which is thin at the proximal end and thick at the distal end, the step surface in the middle of the support seat step through hole is the support seat inner hole step surface (40); the distal end of the support seat step through hole has an inner O-ring groove (42) for the support seat, and a plurality of penetrating support seat radial small holes (32) are provided in the support seat step through hole between the inner O-ring groove (42) for the support seat and the inner hole step surface (40) for the support seat; an eccentric support seat axial eccentric hole (44) is provided on the support seat proximal end surface (39) of the support seat, the support seat axial eccentric hole (44) does not interfere with the support seat step through hole, and the support seat axial eccentric hole (44) is connected to an arc-starting wire (9); The connecting piece (4) is a cylindrical part made of insulating material. The center of the connecting piece (4) is a connecting piece through hole. The proximal end of the connecting piece through hole is a connecting piece internal thread (45). The outer circle of the connecting piece (4) is composed of three sections: the distal end is a connecting piece external thread (48), the middle section is a connecting piece smooth round surface (47), and the proximal end is a connecting piece milling flat structure (49); the diameter of the connecting piece smooth round surface (47) is smaller than the minimum inner hole diameter of the support seat step through hole, and the maximum radial length of the connecting piece milling flat structure (49) is greater than the minimum inner hole diameter of the support seat step through hole; a connecting piece step surface (46) is formed between the connecting piece smooth round surface (47) and the connecting piece milling flat structure (49); The insulating part (1) is a cylindrical part made of insulating material. The outer circle of the insulating part (1) is an insulating part step-like structure with a thin proximal end and a thick distal end. The proximal end of the outer circle of the thick diameter section of the insulating part has an insulating part annular groove (50). A plurality of insulating part axial small holes (30) are distributed on the distal end surface of the insulating part (1). The insulating part axial small holes (30) are connected to the distal end surface of the insulating part (1) and the insulating part annular groove (50). The insulating part axial small holes (30) shall not interfere with the insulating part O-ring groove (51). The inner hole of the insulating member (1) is an insulating member through hole, and the insulating member through hole comprises, from the far end to the near end, an insulating member inner step surface (53), an insulating member far end annular groove (54), an insulating member near end annular groove (55), and an insulating member inner thread (56); The diameter of a section of the insulating member (1) with a thinner outer diameter is smaller than the minimum inner diameter of the step through hole of the support seat, and the diameter of a section of the insulating member (1) with a thicker outer diameter is smaller than the maximum inner diameter of the step through hole of the support seat. The inner thread (56) of the insulating member just matches the outer thread (48) of the connecting member. A plurality of radial holes (24) of the insulating member are distributed on the annular groove (54) at the distal end of the insulating member. The radial holes (24) of the insulating member shall not interfere with the axial holes (30) of the insulating member, and the inner step surface (53) of the insulating member shall not interfere with the axial holes (30) of the insulating member. The insulating member (1) and the connecting member (4) pass through the step through hole of the supporting seat from both ends of the supporting seat (3) and are connected by the external thread (48) of the connecting member and the internal thread (56) of the insulating member until the outer cylindrical step surface of the insulating member (1) abuts against the step surface (40) of the inner hole of the supporting seat and the step surface (46) of the connecting member abuts against the proximal end surface (39) of the supporting seat, thereby pressing the supporting seat; The first sealing ring (12) is located in the O-ring groove (42) in the support seat and is pressed by the outer circumferential surface of the insulating member (1) to perform a sealing function; The inner copper part (5) is an axial part made of conductive material. The inner copper part inner thread (57) is located at the proximal end of the central inner copper part through hole of the inner copper part (5). The proximal outer surface of the inner copper part (5) is an inner copper part milling flat (60). An inner copper part O-ring groove (62) is located in the middle of the outer surface of the inner copper part (5). An inner copper part outer thread (62) is provided between the inner copper part milling flat (60) and the inner copper part O-ring groove (62). The maximum radial dimension of the inner copper part milling flat (60) structure is greater than the inner hole dimension of the proximal end of the connecting part (4). The inner copper part (5) is inserted into the connecting part through hole and connected to the inner copper part outer thread (62) and the connecting part inner thread (45) until the step surface of the inner copper part milling flat (60) structure fits the proximal end surface of the proximal end of the connecting part (4). The second sealing ring (14) is located in the O-ring groove (62) of the inner copper part and is pressed by the inner circular surface of the connecting part (4) to play a sealing role; The copper air pipe (7) is a tubular part made of a conductive material. One end of the copper air pipe (7) is provided with a copper air pipe external thread (41), and the copper air pipe external thread (41) is connected to the internal thread (57) of the inner copper part. The heat shrink tube (8) is an insulating part that can shrink when heated and is sleeved on the copper air pipe (7), with one end of the heat shrink tube (8) supporting the proximal end surface of the inner copper part (5); The insulating cover (6) is a part made of insulating material, covering the milled flat structure (60) of the inner copper part, and the inner hole of the insulating cover (6) presses the heat shrink tube (8) tightly.

2. The detachable non-rebound plasma cutting gun head according to claim 1, characterized in that: The inner diameter of the proximal annular groove (55) of the insulating member is larger than the diameter of the through hole of the connecting member; The inner copper part (5) has an inner copper part inner step surface (58) near the inner hole at the far end, and the far end of the inner copper part (5) is an axial inner copper part cross groove (59) structure; The clamping claw (2) is made of a wear-resistant material and has a certain resilience. The clamping claw (2) is provided with an axial clamping claw cross groove (52) structure. The number and width of the axial grooves of the claw cross groove (52) of the claw (2) and the inner copper cross groove (59) of the inner copper part (5) are consistent, and the claw (2) shall not fall off after being connected to the middle of the distal end of the inner copper part (5); After the inner copper part (5) passes through the through hole of the connecting part, the clamping claw (2) will be located in the proximal annular groove (55) of the insulating part to play a role in restraining rebound.

3. The detachable non-rebound plasma cutting gun head according to claim 1, characterized in that: An outer O-ring groove (43) of the support seat is located on the outer circle of the distal end of the radial small hole (32) of the support seat; the third sealing ring (13) is located in the outer O-ring groove (43) of the support seat and is used to prevent leakage of cooling gas when assembling the outer nozzle.

4. The detachable non-rebound plasma cutting gun head according to claim 1, characterized in that: An insulating O-ring groove (51) is provided at the far end of the outer circle of the thick diameter section insulating part; a fourth sealing ring (11) is located in the insulating O-ring groove (51) and is used to prevent leakage of plasma cutting gas when assembling the arc starter.

5. The detachable non-rebound plasma cutting gun head according to claim 1, characterized in that: The inner diameter of the proximal annular groove (55) of the insulating member is larger than the diameter of the through hole of the connecting member; The inner hole diameter at the distal end of the inner copper part is smaller than the step inner hole diameter of the proximal annular groove (55) of the insulating part, ensuring that the electrode can contact the surface of the inner copper part. The outer circular surface at the distal end of the inner copper part fits with the inner hole surface at the distal end of the connecting part (4) to ensure concentricity. The drum spring (63) is located in the proximal annular groove (55) of the insulating part to clamp the electrode.

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