Detachable springback-free plasma cutting gun head

Abstract

The utility model discloses a detachable springback-free plasma cutting gun head which is formed by assembling mechanical structures of all parts, is convenient to install and easy to disassemble and 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 utility model relates to ion cutting technical field more specifically, relate to a detachable non-rebound plasma cutting torch head. BACKGROUND

[0002] The plasma cutting torch head commonly used in prior art is connected by injection molding wood each part together, and cannot be disassembled after injection molding, and the torch head cannot be repaired when damaged, the pressure generated during injection molding of the wood can extrude and deform the internal parts of the torch head, resulting in reduced cutting accuracy, and the injection molding wood cannot be ensured to have no pores or cracks, which can cause short circuit and burnout of the torch head, in addition, the copper part in the torch head is only clamped by a cross slot when connected with the electrode, the contact area is small, the resistance is large, and the torch head is easy to heat after electrification, thereby shortening the service life of the accessory. UTILITY MODEL CONTENTS

[0003] In view of the problems existing in the prior art, the utility model provides a detachable non-rebound plasma cutting torch head, the torch head is assembled by the mechanical structure of each part, convenient to install and simple to disassemble, and the torch head can be repaired, on the other hand, the torch head is matched by the mechanical structure, and is not disturbed by the uncertain factor of external injection molding pressure, the accuracy of the torch head is more accurate, and the cutting quality is higher, on the other hand, the double protection of the insulating cover and the heat shrink tube makes the positive and negative electrode distance of the torch head very far, and eliminates the possibility of short circuit and ignition, on the other hand, the internal copper part in the torch head is internally provided with a stepped surface that can be in contact with the electrode plane, so that the electrical contact area of the accessory is larger, thereby prolonging the service life of the accessory.

[0004] The technical scheme of the utility model is as follows: a detachable non-rebound plasma cutting torch head, comprising an insulating part, a support seat, a connecting part, an internal copper part, an insulating cover, a copper air pipe, a heat shrink tube, an arc leading 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 stepped through hole with a thin proximal end and a thick distal end, and the stepped surface in the middle of the support seat stepped through hole is a support seat inner hole stepped surface; the distal end of the support seat stepped through hole has a support seat inner O-ring groove, a plurality of support seat radial small holes are formed in the support seat stepped through hole between the support seat inner O-ring groove and the support seat inner hole stepped surface; the support seat proximal end surface of the support seat has an eccentric support seat axial eccentric hole, the support seat axial eccentric hole does not interfere with the support seat stepped through hole, the arc leading wire is connected in the support seat axial eccentric hole and is compressed or welded, and the arc leading wire terminal is crimped with the other end of the arc leading wire.

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

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

[0008] The inner hole of the insulating piece is an insulating piece through hole, and the insulating piece through hole sequentially has an insulating piece internal stepped surface, an insulating piece distal end annular groove, an insulating piece proximal end annular groove, and an insulating piece internal thread from the distal end to the proximal end;

[0009] The diameter of the thin section of the outer circle of the insulating piece is smaller than the minimum inner hole diameter of the support seat stepped through hole, the diameter of the thick section of the outer circle of the insulating piece is smaller than the maximum inner hole diameter of the support seat stepped through hole, the insulating piece internal thread is matched with the connecting piece external thread, a plurality of insulating piece radial small holes are distributed on the insulating piece distal end annular groove, the insulating piece radial small holes cannot interfere with the insulating piece axial small holes, and the insulating piece internal stepped surface cannot interfere with the insulating piece axial small holes;

[0010] The insulating piece and the connecting piece pass through the support seat stepped through hole from both ends of the support seat, and are connected through the connecting piece external thread and the insulating piece internal thread, until the outer circle stepped surface of the insulating piece is attached to the inner hole stepped surface of the support seat, and the connecting piece stepped surface is attached to the proximal end surface of the support seat, so as to compress the support seat;

[0011] The first sealing ring is located in the O-ring groove in the support seat, and is compressed by the outer circle surface of the insulating piece to play a sealing role;

[0012] The inner copper piece is an axial part made of conductive material, the proximal end of the central inner copper piece through hole is an inner copper piece internal thread, the proximal end outer surface of the inner copper piece is an inner copper piece milling flat, the middle part of the outer surface of the inner copper piece has an inner copper piece O-ring groove, an inner copper piece external thread is arranged between the inner copper piece milling flat and the inner copper piece O-ring groove, the maximum radial dimension of the inner copper piece milling flat structure is greater than the inner hole dimension of the proximal end of the connecting piece, the inner copper piece is inserted into the connecting piece through hole and connected through the inner copper piece external thread and the connecting piece internal thread until the step surface of the inner copper piece milling flat structure is attached to the proximal end surface of the proximal end of the connecting piece;

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

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

[0015] The heat shrink tube is an insulating part that can be shrunk by heating, and is sleeved on the copper air pipe, one end of the heat shrink tube abuts against the proximal end surface of the inner copper piece.

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

[0017] Further, the inner diameter of the proximal end annular groove of the insulating part is greater than the diameter of the connecting piece through hole.

[0018] The inner hole of the inner copper piece near the distal end has an inner copper piece inner step surface, and the distal end of the inner copper piece is an axial inner copper piece cross groove structure.

[0019] The pawl is made of wear-resistant material and has a certain resilience, and the pawl has an axial pawl cross groove structure.

[0020] The axial groove number and groove width of the pawl cross groove of the pawl and the inner copper piece cross groove of the inner copper piece are consistent, and the pawl cannot be detached after being connected with the middle part of the distal end of the inner copper piece.

[0021] After the inner copper piece is inserted into the connecting piece through hole, the pawl is located in the proximal end annular groove of the insulating part and plays a role of constraining resilience.

[0022] Further, an outer O-ring groove of the support seat is arranged on the distal end outer circle of the radial small hole of the support seat, and a third sealing ring is located in the outer O-ring groove of the support seat to prevent leakage of cooling gas when the outer nozzle is assembled.

[0023] Further, the outer circle of the coarse diameter section insulating piece has a distal end insulating piece O-ring groove; and the fourth sealing ring is located in the insulating piece O-ring groove and used for preventing leakage of plasma cutting gas when the arc igniter is assembled.

[0024] Further, the inner diameter of the proximal end annular groove of the insulating piece is greater than the diameter of the through hole of the connecting piece;

[0025] The distal end inner hole diameter of the inner copper piece is smaller than the stepped inner hole diameter of the proximal end annular groove of the insulating piece, so that the electrode can be in surface contact with the inner copper piece, the distal end outer circle surface of the inner copper piece is matched with the distal end inner hole surface of the connecting piece, and the concentricity is ensured; and the coil spring is located in the proximal end annular groove of the insulating piece and tightly encircles the electrode.

[0026] The utility model discloses a detachable non-rebound plasma cutting gun head, and the gun head is assembled by the mechanical structure of various parts, convenient to install, simple to disassemble, and the gun head can be maintained. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of the plasma cutting gun head using the utility model.

[0028] Figure 2 It is a sectional view of the plasma cutting gun head and vulnerable part using the utility model.

[0029] Figure 3 It is a gas flow schematic view of the plasma cutting gun head using the utility model.

[0030] Figure 4 It is an exploded view of the plasma cutting gun head using the utility model.

[0031] Figure 5 It is a sectional view of the cutting gun head using the second embodiment of the utility model.

[0032] Wherein:

[0033] 1-insulating piece 2-claw 3-supporting seat

[0034] 4-connecting piece 5-inner copper piece 6-insulating cover

[0035] 7-copper gas pipe 8-heat shrink tube 9-arc igniting wire

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

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

[0038] 16 - arc striking device 17 - nozzle 18 - outer nozzle

[0039] 19 - protective cap 20 - inner hole of copper tube 21 - inner hole of inner copper piece

[0040] 22 - inner hole of electrode 23 - radial hole of electrode 24 - radial hole of insulating piece 25 - first gas chamber 26 - gas inlet hole of arc striking device 27 - second gas chamber

[0041] 28 - gas outlet of arc striking device 29 - third gas chamber 30 - axial hole of insulating piece 31 - fourth gas chamber 32 - radial hole of support seat 33 - gas hole for cooling nozzle

[0042] 34 - fifth gas chamber 35 - central hole of protective cap 36 - vortex hole of nozzle

[0043] 37 - sixth gas chamber 38 - central hole of nozzle 39 - end face of proximal end of support seat 40 - stepped face of inner hole of support seat 41 - external thread of copper tube 42 - groove for O-ring of support seat 43 - groove for O-ring of support seat 44 - axial eccentric hole of support seat 45 - internal thread of connecting piece

[0044] 46 - stepped face of connecting piece 47 - smooth surface of connecting piece 48 - external thread of connecting piece

[0045] 49 - milled flat structure of connecting piece 50 - annular groove of insulating piece 51 - groove for O-ring of insulating piece

[0046] 52 - cross groove of clamping claw 53 - stepped face of inner hole of insulating piece 54 - annular groove of distal end of insulating piece

[0047] 55 - annular groove of proximal end of insulating piece 56 - internal thread of insulating piece 57 - internal thread of inner copper piece

[0048] 58 - stepped face of inner hole of inner copper piece 59 - cross groove of inner copper piece 60 - milled flat of inner copper piece

[0049] 61 - external thread of inner copper piece 62 - groove for O-ring of inner copper piece 63 - coil spring

[0050] 64 - another example of inner copper piece 65 - stepped face of outer round of insulating piece 66 - stepped face of milled flat of inner copper piece DETAILED DESCRIPTION

[0051] Example One

[0052] The plasma cutting torch head of the present application is further described in detail in combination with the drawings.

[0053] The plasma cutting torch head of the present application is a detachable non-rebound plasma cutting torch head, which is convenient to maintain, has better insulation performance, and has a rebound mechanism outside the torch head, thus having better cutting precision.

[0054] As shown in Figure 1 A detachable non-rebound plasma cutting torch head comprises an insulating part 1, a clamping jaw 2, a support seat 3, a connecting part 4, an inner copper part 5, an insulating cover 6, a copper gas pipe 7, a heat shrink tube 8, an arc striking wire 9, an arc striking 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] As shown in Figure 2 The support seat 3 is a cylindrical part made of a conductive material, the center of the support seat 3 is a support seat stepped through hole with a thin proximal end and a thick distal end, and the stepped surface in the middle of the support seat stepped through hole is a support seat inner hole stepped surface 40. The distal end of the support seat stepped through hole has a support seat inner O-ring groove 42, and a plurality of support seat radial small holes 32 are formed in the support seat stepped through hole between the support seat inner O-ring groove 42 and the support seat inner hole stepped surface 40. The support seat proximal end surface 39 of the support seat 3 has an eccentric support seat axial eccentric hole 44, the support seat axial eccentric hole 44 does not interfere with the support seat stepped through hole, the arc striking wire 9 is connected in the support seat axial eccentric hole 44 and is crimped or welded. The arc striking wire terminal 10 is crimped to the other end of the arc striking wire 9.

[0056] The connecting part 4 is a cylindrical part made of an insulating material, the center of the connecting part 4 is a connecting part through hole, the proximal end of the connecting part through hole is a connecting part inner thread 45, and the outer circle of the connecting part 4 is composed of three sections: a connecting part outer thread 48 at the distal end, a connecting part smooth surface 47 at the middle section, and a connecting part milled flat structure 49 at the proximal end. The diameter of the connecting part smooth surface 47 is smaller than the minimum inner hole diameter of the support seat stepped through hole, and the maximum radial length of the connecting part milled flat structure 49 is greater than the minimum inner hole diameter of the support seat stepped through hole. The connecting part stepped surface 46 is formed between the connecting part smooth surface 47 and the connecting part milled 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 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 face of the insulating part 1, the insulating part axial small holes 30 communicate the distal end face of the insulating part 1 and the insulating part annular groove 50, the insulating part axial small holes 30 cannot interfere with the insulating part O-ring groove 51.

[0058] The inner hole of the insulating part 1 is an insulating part through hole, the insulating part through hole sequentially has an insulating part inner stepped face 53, an insulating part distal end annular groove 54, an insulating part proximal end annular groove 55 and an insulating part inner thread 56 from the distal end to the proximal end.

[0059] The diameter of the thin diameter section of the outer circle of the insulating part 1 is smaller than the minimum inner hole diameter of the support seat stepped through hole, the diameter of the thick diameter section of the outer circle of the insulating part 1 is smaller than the maximum inner hole diameter of the support seat stepped through hole, the insulating part inner thread 56 just matches the connecting part outer thread 48, a plurality of insulating part radial small holes 24 are distributed on the insulating part distal end annular groove 54, the insulating part radial small holes 24 cannot interfere with the insulating part axial small holes 30, the insulating part inner stepped face 53 also cannot interfere with the insulating part axial small holes 30.

[0060] The insulating part 1 and the connecting part 4 pass through the support seat stepped through hole from both ends of the support seat 3, and are connected through the connecting part outer thread 48 and the insulating part inner thread 56, until the outer circle stepped face of the insulating part 1 is attached to the support seat inner hole stepped face 40, and the connecting part stepped face 46 is attached to the proximal end face 39 of the support seat, thereby compressing the support seat.

[0061] The first sealing ring 12 is located in the support seat inner O-ring groove 42, and is compressed by the outer circle face of the insulating part 1 to play a sealing role.

[0062] The inner copper part 5 is an axial part made of conductive material, the proximal end of the central inner copper part through hole of the inner copper part 5 is an inner copper part inner thread 57, the proximal end outer surface of the inner copper part 5 is an inner copper part milling flat 60, the outer surface of the inner copper part 5 has an inner copper part O-ring groove 62 in the middle, an inner copper part outer thread 61 is arranged between the inner copper part milling flat 60 and the inner copper part O-ring groove 62, the maximum radial dimension of the structure of the inner copper part milling flat 60 is greater than the inner hole dimension of the proximal end of the connecting part 4, the inner copper part 5 passes into the connecting part through hole, and is connected through the inner copper part outer thread 61 and the connecting part inner thread 45, until the stepped face of the structure of the inner copper part milling flat 60 is attached to the proximal end face of the proximal end of the connecting part 4.

[0063] The second sealing ring 14 is located in the inner copper part O-ring groove 62, and is compressed by the inner circle face of the connecting part 4 to play a sealing role.

[0064] The copper tube 7 is a tubular part made of conductive material, one end of the copper tube 7 has a copper tube external thread 41, which is connected with the internal copper piece internal thread 57.

[0065] The heat shrink tube 8 is an insulating piece that can be shrunk by heating, which is sleeved on the copper tube 7, and one end of the heat shrink tube 8 abuts against the proximal end face of the internal copper piece 5.

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

[0067] The inner diameter of the proximal end annular groove 55 of the insulating piece is greater than the diameter of the through hole of the connecting piece. The inner hole of the internal copper piece 5 near the distal end has an internal copper piece internal step face 58, and the distal end of the internal copper piece 5 is an axial internal copper piece cross groove 59 structure. The claw 2 is made of wear-resistant material and has a certain resilience, and the claw 2 has an axial claw cross groove 52 structure. The axial groove number and groove width of the claw cross groove 52 of the claw 2 and the internal copper piece cross groove 59 of the internal copper piece 5 are consistent, and the claw 2 cannot be detached after being connected with the middle part of the distal end of the internal copper piece 5. After the internal copper piece 5 passes through the through hole of the connecting piece, the claw 2 will be in the proximal end annular groove 55 of the insulating piece to play a role in restraining resilience.

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

[0069] The distal end of the outer circle of the coarse diameter section insulating piece has an insulating piece O-ring groove 51. The fourth sealing ring 11 is located in the insulating piece O-ring groove 51, which is used to prevent the leakage of plasma cutting gas when assembling the arc igniter.

[0070] As shown in Figure 3 , 4 A detachable non-resilient plasma cutting gun head vulnerable part, comprising: an electrode 15, an arc igniter 16, a nozzle 17, an outer nozzle 18 and a protective cap 19.

[0071] The chamber between the outer nozzle 18, the insulating piece 1, the arc igniter 16 and the nozzle 17 is the first gas chamber 25, the arc igniter 16 has an internal movable chamber which is the second gas chamber 27, the chamber between the electrode 15 and the arc tube is the third gas chamber, the chamber between the support seat 3 and the insulating piece 1 is the fourth gas chamber, the chamber between the nozzle 17 and the protective cap 19 is the fifth gas chamber 34, and the chamber between the electrode 15 and the nozzle 17 is the sixth chamber.

[0072] As shown in Figure 4 ​As shown, the total airflow enters from the inner hole 20 of the copper gas pipe, passes through the inner hole 21 of the inner copper component and the inner hole 22 of the electrode, and enters the first gas chamber 25 through the radial holes 23 of the electrode and 24 of the insulating component. It then splits into three airflow paths: one is the pre-cooling airflow, which enters the fifth gas chamber 34 through the nozzle cooling air hole 33 and is then blown out through the central hole 35 of the protective cap. Another is the post-cooling airflow, which enters the second gas chamber 27 through the arc inlet 26, causing the piston inside the arc initiator 16 to rebound and trigger the arc. The airflow then flows through the arc inlet 28 into the third gas chamber 29, then through the axial hole 30 of the insulating component into the fourth gas chamber 31, and finally flows out of the gun head through the radial hole 32 of the support base. The third is the cutting airflow, which rotates from the nozzle vortex hole 36 into the sixth gas chamber 37 and is then blown out through the central hole 38 of the nozzle to produce a plasma arc.

[0073] Example 2

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

[0075] The above description is only a preferred embodiment of the present utility model. 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 utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A detachable non-rebound plasma cutting torch head, characterized by: The insulating piece (1), the support seat (3), the connecting piece (4), the inner copper piece (5), the insulating cover (6), the copper air pipe (7), the heat shrink tube (8), the arc leading wire (9), the first sealing ring (12) and the second sealing ring (14) are included. The support seat (3) is a cylindrical part made of conductive material, the center of the support seat (3) is a support seat stepped through hole with a thin proximal end and a thick distal end, the stepped surface in the middle of the support seat stepped through hole is a support seat inner hole stepped surface (40), the distal end of the support seat stepped through hole has a support seat inner O-ring groove (42), a plurality of support seat radial small holes (32) are arranged in the support seat stepped through hole between the support seat inner O-ring groove (42) and the support seat inner hole stepped surface (40), the support seat proximal end surface (39) of the support seat (3) has an eccentric support seat axial eccentric hole (44), the support seat axial eccentric hole (44) does not interfere with the support seat stepped through hole, and the arc leading wire (9) is connected in the support seat axial eccentric hole (44); 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 inner thread (45), the outer circle of the connecting piece (4) is composed of three sections: a distal end connecting piece outer thread (48), a middle connecting piece smooth surface (47), and a proximal end connecting piece milling flat structure (49), the diameter of the connecting piece smooth surface (47) is smaller than the minimum inner hole diameter of the support seat stepped 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 stepped through hole; the connecting piece smooth surface (47) and the connecting piece milling flat structure (49) form a connecting piece stepped surface (46); The insulating piece (1) is a cylindrical part made of insulating material, the outer circle of the insulating piece (1) is a stepped 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 piece has an insulating piece annular groove (50), a plurality of insulating piece axial small holes (30) are distributed on the distal end surface of the insulating piece (1), the insulating piece axial small holes (30) communicate the distal end surface of the insulating piece (1) and the insulating piece annular groove (50), and the insulating piece axial small holes (30) cannot interfere with the insulating piece O-ring groove (51); The inner hole of the insulating piece (1) is an insulating piece through hole, and the insulating piece through hole sequentially comprises an insulating piece inner stepped surface (53), an insulating piece distal end annular groove (54), an insulating piece proximal end annular groove (55), and an insulating piece inner thread (56) from the distal end to the proximal end. The diameter of the thinner section of the outer circle of the insulating piece (1) is smaller than the minimum inner hole diameter of the stepped through hole of the support base, the diameter of the thicker section of the outer circle of the insulating piece (1) is smaller than the maximum inner hole diameter of the stepped through hole of the support base, the inner thread (56) of the insulating piece just fits the outer thread (48) of the connecting piece, the annular groove (54) of the distal end of the insulating piece is provided with a plurality of radial small holes (24) of the insulating piece, the radial small holes (24) of the insulating piece do not interfere with the axial small holes (30) of the insulating piece, and the inner stepped surface (53) of the insulating piece also does not interfere with the axial small holes (30) of the insulating piece; The insulating piece (1) and the connecting piece (4) pass through the stepped through hole of the support base (3) from both ends of the support base, and are connected through the outer thread (48) of the connecting piece and the inner thread (56) of the insulating piece, until the outer circle stepped surface of the insulating piece (1) is attached to the inner hole stepped surface (40) of the support base, and the connecting piece stepped surface (46) is attached to the proximal end surface (39) of the support base, so as to compress the support base; The first sealing ring (12) is located in the O-shaped ring groove (42) of the support base, and is compressed by the outer surface of the insulating piece (1) to play a sealing role; The inner copper piece (5) is an axial part made of conductive material, the proximal end of the central through hole of the inner copper piece (5) is an inner thread (57) of the inner copper piece, the proximal end of the outer surface of the inner copper piece (5) is a milled flat surface (60) of the inner copper piece, the outer surface of the inner copper piece (5) has an O-shaped ring groove (62) in the middle, and the milled flat surface (60) of the inner copper piece and the O-shaped ring groove (62) of the inner copper piece are provided with an outer thread (61) of the inner copper piece, the maximum radial dimension of the structure of the milled flat surface (60) of the inner copper piece is greater than the inner hole size of the proximal end of the connecting piece (4), the inner copper piece (5) passes into the through hole of the connecting piece, and is connected through the outer thread (61) of the inner copper piece and the inner thread (45) of the connecting piece, until the stepped surface of the structure of the milled flat surface (60) of the inner copper piece is attached to the proximal end surface of the proximal end of the connecting piece (4); The second sealing ring (14) is located in the O-shaped ring groove (62) of the inner copper piece, and is compressed by the inner surface of the connecting piece (4) to play a sealing role; The copper air pipe (7) is a tubular part made of conductive material, and has an outer thread (41) at one end, which is connected with the inner thread (57) of the inner copper piece; The heat shrink tube (8) is an insulating piece that can be shrunk by heating, which is sleeved on the copper air pipe (7), and one end of the heat shrink tube (8) abuts against the proximal end surface of the inner copper piece (5); The insulating cover (6) is a part made of insulating material, which covers the structure of the milled flat surface (60) of the inner copper piece, and the inner hole of the insulating cover (6) compresses the heat shrink tube (8).

2. A detachable non-rebound plasma cutting torch head according to claim 1, characterized in that: The inner diameter of the annular groove (55) of the proximal end of the insulating piece is greater than the diameter of the through hole of the connecting piece; The inner hole near the distal end of the inner copper piece (5) has an inner stepped surface (58), and the distal end of the inner copper piece (5) is an axial cross groove (59) structure. The pawl (2) is made of wear-resistant material and has certain resilience, and the pawl (2) has an axial pawl cross groove (52) structure; The axial groove number and groove width of the pawl cross groove (52) of the pawl (2) and the inner copper piece cross groove (59) of the inner copper piece (5) are consistent, and the pawl (2) cannot be detached after being connected with the distal end of the inner copper piece (5); After the inner copper piece (5) passes through the through hole of the connecting piece, the pawl (2) will be in the proximal end annular groove (55) of the insulating piece to play a role of restraining resilience.

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

4. A detachable non-rebound plasma cutting torch head according to claim 1, wherein: The distal end of the outer circle of the coarse diameter section insulating piece has an insulating piece O-ring groove (51); the fourth sealing ring (11) is located in the insulating piece O-ring groove (51) and is used to prevent the leakage of plasma cutting gas when assembling the arc igniter.

5. A detachable non-rebound plasma cutting torch head according to claim 1, wherein: The inner diameter of the proximal end annular groove (55) of the insulating piece is greater than the diameter of the through hole of the connecting piece; The distal end inner hole diameter of the inner copper piece is smaller than the stepped inner hole diameter of the proximal end annular groove (55) of the insulating piece, which ensures that the electrode can be in contact with the inner copper piece surface, the distal end outer circle surface of the inner copper piece is fitted with the distal end inner hole surface of the connecting piece (4) to ensure concentricity; the drum spring (63) is located in the proximal end annular groove (55) of the insulating piece to tighten the electrode.

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