A plasma cutting gun head common to high frequency and non-high frequency

Abstract

The present invention provides a plasma cutting gun head for high frequency and non-high frequency, comprising an electrode, a flow divider, a nozzle and an outer nozzle; when the gun head only replaces the flow divider in the accessory, the conversion between high frequency and non-high frequency can be achieved. The gun head includes a joint nut, an air pipe, a top cover, a piston rod, a support seat, a compression spring, a sealing ring, and a crown spring; the piston rod can slide axially in the inner hole of the support seat, and its sliding stroke is limited by the support seat and the top cover. A compression spring is arranged between the piston rod and the top cover to realize the reset of the piston rod, and the top cover and the support seat are interference fit to form a whole; a crown spring is arranged in the inner hole of the piston rod to fix the electrode on the piston rod; one end of the air pipe is connected to the top cover, and the other end is connected to the joint nut; the gun head can be used on both high-frequency plasma cutting power supplies and non-high-frequency plasma cutting power supplies.

Description

Technical Field

[0001] The invention relates to the technical field of ion cutting, and more particularly to a plasma cutting gun head for use with both high-frequency and non-high-frequency plasma cutting guns. Background Art

[0002] Material processing devices such as plasma cutting, flame cutting and lasers are widely used for cutting and marking workpieces. Plasma cutting generally includes a cutting body, an electrode mounted in the body, a nozzle with a central hole, electrical connections, channels for cooling and arc control fluids, swirl rings (i.e., diverters) to control the flow pattern of the fluid, and a power source. The gas used in the cutting can be an inert or reactive gas. The plasma arc produced by the cutting is an ionized jet of high temperature and high momentum plasma gas contraction.

[0003] Compared with traditional flame cutting, plasma cutting is faster, more efficient and of better quality when the thickness is less than 25mm. Compared with laser cutting, it has obvious advantages in cutting cost, which is almost 1 / 3 of laser cutting, and laser is only suitable for cutting thin plates, with a narrow application range. In addition, CNC plasma cutting combined with automatic nesting programming software can increase material utilization by 5% to 10%. If 20 million tons of steel are cut annually, 1 million to 2 million tons of steel can be saved each year, which is worth tens of billions of yuan. Therefore, in industrially developed countries, there has been a trend of replacing flame cutting machines and laser cutting machines with CNC plasma cutting machines. Therefore, research and promotion of plasma cutting technology has important significance and far-reaching development prospects.

[0004] In the prior art, plasma cutting is commonly used. The plasma cutting gun heads used with high-frequency plasma cutting power sources are limited to high-frequency gun heads, and the plasma cutting gun heads used with non-high-frequency plasma cutting power sources are limited to non-high-frequency gun heads. This will increase costs and make operation and management inconvenient. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a plasma cutting gun head and accessories for high-frequency and non-high-frequency use, with the purpose of realizing the common use of high-frequency and non-high-frequency plasma cutting gun heads by simply replacing the diverter in the accessories, thereby saving costs; another purpose is that the combination of the electrode and the crown spring can make the coaxiality of the electrode and the gun head more accurate, thereby achieving better cutting effect.

[0006] The technical solution of the present invention is: a high-frequency plasma cutting gun head, comprising a support seat, the support seat comprising an upper large inner diameter cylindrical structure and a lower small inner diameter cylindrical structure, a plurality of support seat axial small holes are opened from top to bottom in the side wall of the small inner diameter cylindrical structure; the top of the support seat axial small hole is connected to the cavity of the large inner diameter cylindrical structure, and the bottom is connected to the bottom end of the small inner diameter cylindrical structure;

[0007] A top cover is arranged inside the large inner diameter cylindrical structure, the outer side of the top cover is interference fit with the inner side of the top of the support seat, a threaded hole connected to the air pipe is opened at the center of the top cover, and one or more radial holes of the top cover connected to the threaded hole are opened on the side wall of the top cover at the bottom of the threaded hole for gas circulation;

[0008] The bottom of the top cover is provided with a blind hole capable of accommodating a compression spring, and the bottom surface of the blind hole supports the compression spring; the outer circle of the bottom of the top cover is clearance-matched with the inner side surface of the large inner diameter cylindrical structure to form a first air chamber connected with the radial small hole of the top cover and the axial small hole of the support seat;

[0009] A piston rod is arranged in the support seat, and the piston rod is a hollow rod-shaped structure. The boss on the top of the piston rod is inserted into the compression spring. The boss surface on the top of the piston rod can support the compression spring and can contact and cooperate with the step surface at the bottom of the top cover to limit the position. The bottom of the piston rod is inserted into the small inner diameter cylindrical structure, and the outer diameter of the bottom of the piston rod is equal to the inner diameter of the small inner diameter cylindrical structure, and can move up and down along the axial direction inside the small inner diameter cylindrical structure.

[0010] A crown spring is arranged inside the bottom of the piston rod, and the top boss of the electrode is inserted into the crown spring inside the bottom of the piston rod and clamped by the crown spring. The crown spring is composed of spring pieces in the circumferential direction and is evenly distributed, which can ensure that the electrode and the piston rod have good coaxiality, thereby improving the cutting quality. The top boss of the electrode can support the bottom surface of the piston rod and can contact and cooperate with the step surface at the bottom of the support seat to limit the position;

[0011] A high-frequency diverter and a nozzle are provided at the bottom of the electrode, one end of the high-frequency diverter contacts the electrode, and the other end contacts the nozzle; the outer nozzle is connected to the bottom of the support seat by a thread, and the internal step of the outer nozzle contacts the nozzle, so that the electrode, the high-frequency diverter and the nozzle are completely fixed, and at this time, the electrode and the nozzle always remain separated; the second air chamber formed between the high-frequency diverter and the outer nozzle, the gap between the nozzle and the outer nozzle, the radial holes of the high-frequency diverter, the inner holes of the nozzle, the nozzle holes and the axial holes of the support seat are connected to form a gas channel, providing the required air gap for the machine when high-frequency arcing is performed.

[0012] Furthermore, one end of the air pipe is connected to the threaded hole on the top of the top cover, and the other end is connected to the joint nut; the joint nut is a rotating body with good conductive properties, with a through hole in the center, which can accommodate the air pipe, and one end of the outside is provided with a thread that can be connected to the cable connector, and the other end is provided with a milled edge that can fix the gun head when connecting the cable connector.

[0013] Furthermore, the gun head can be used for bakelite injection molding and can also be used for a molded handle shell.

[0014] The present invention also provides a non-high-frequency plasma cutting gun head, comprising a support seat, wherein the support seat comprises an upper large inner diameter cylindrical structure and a lower small inner diameter cylindrical structure, wherein a plurality of support seat axial small holes are opened from top to bottom in the side wall of the small inner diameter cylindrical structure; the top of the support seat axial small hole is connected to the cavity of the large inner diameter cylindrical structure, and the bottom is connected to the bottom end of the small inner diameter cylindrical structure;

[0015] A top cover is arranged inside the large inner diameter cylindrical structure, the outer side of the top cover is interference fit with the inner side of the top of the support seat, a threaded hole connected to the air pipe is opened at the center of the top cover, and one or more radial holes of the top cover connected to the threaded hole are opened on the side wall of the top cover at the bottom of the threaded hole for gas circulation;

[0016] The bottom of the top cover is provided with a blind hole capable of accommodating a compression spring, and the bottom surface of the blind hole supports the compression spring; the outer circle of the bottom of the top cover is clearance-matched with the inner side surface of the large inner diameter cylindrical structure to form a first air chamber connected with the radial small hole of the top cover and the axial small hole of the support seat;

[0017] A piston rod is arranged in the support seat, and the piston rod is a hollow rod-shaped structure. The boss on the top of the piston rod is inserted into the compression spring. The boss surface on the top of the piston rod can support the compression spring and can contact and cooperate with the step surface at the bottom of the top cover to limit the position. The bottom of the piston rod is inserted into the small inner diameter cylindrical structure, and the outer diameter of the bottom of the piston rod is equal to the inner diameter of the small inner diameter cylindrical structure, and can move up and down along the axial direction inside the small inner diameter cylindrical structure.

[0018] A crown spring is arranged inside the bottom of the piston rod, and the top boss of the electrode is inserted into the crown spring inside the bottom of the piston rod and clamped by the crown spring. The crown spring is composed of spring pieces in the circumferential direction and is evenly distributed, which can ensure that the electrode and the piston rod have good coaxiality, thereby improving the cutting quality. The top boss of the electrode can support the bottom surface of the piston rod and can contact and cooperate with the step surface at the bottom of the support seat to limit the position;

[0019] A non-high-frequency diverter and a nozzle are provided at the bottom of the electrode, one end of the non-high-frequency diverter contacts the bottom of the support seat, and the other end contacts the nozzle; the outer nozzle is connected to the bottom of the support seat by a thread, and the internal step of the outer nozzle contacts the nozzle, so that the non-high-frequency diverter and the nozzle are completely fixed, so that the second air chamber formed between the high-frequency diverter and the outer nozzle, the gap between the nozzle and the outer nozzle, the radial holes of the high-frequency diverter, the inner holes of the nozzle, the nozzle holes and the axial holes of the support seat are connected; at this time, the electrode is subjected to the elastic force of the compression spring and contacts the nozzle, and when a sufficient amount of gas flows in, the electrode will compress the compression spring and separate from the nozzle.

[0020] Furthermore, one end of the air pipe is connected to the threaded hole on the top of the top cover, and the other end is connected to the joint nut; the joint nut is a rotating body with good conductive properties, with a through hole in the center, which can accommodate the air pipe, and one end of the outside is provided with a thread that can be connected to the cable connector, and the other end is provided with a milled edge that can fix the gun head when connecting the cable connector.

[0021] Furthermore, the gun head can be used for bakelite injection molding and can also be used for a molded handle shell.

[0022] The present invention also provides a plasma cutting gun head for high frequency and non-high frequency, comprising a support seat, wherein the support seat comprises an upper large inner diameter cylindrical structure and a lower small inner diameter cylindrical structure, wherein a plurality of support seat axial small holes are opened from top to bottom in the side wall of the small inner diameter cylindrical structure; the top of the support seat axial small hole is connected to the cavity of the large inner diameter cylindrical structure, and the bottom is connected to the bottom end of the small inner diameter cylindrical structure;

[0023] A top cover is arranged inside the large inner diameter cylindrical structure, the outer side of the top cover is interference fit with the inner side of the top of the support seat, a threaded hole connected to the air pipe is opened at the center of the top cover, and one or more radial holes of the top cover connected to the threaded hole are opened on the side wall of the top cover at the bottom of the threaded hole for gas circulation;

[0024] The bottom of the top cover is provided with a blind hole capable of accommodating a compression spring, and the bottom surface of the blind hole supports the compression spring; the outer circle of the bottom of the top cover is clearance-matched with the inner side surface of the large inner diameter cylindrical structure to form a first air chamber connected with the radial small hole of the top cover and the axial small hole of the support seat;

[0025] A piston rod is arranged in the support seat, and the piston rod is a hollow rod-shaped structure. The boss on the top of the piston rod is inserted into the compression spring. The boss surface on the top of the piston rod can support the compression spring and can contact and cooperate with the step surface at the bottom of the top cover to limit the position. The bottom of the piston rod is inserted into the small inner diameter cylindrical structure, and the outer diameter of the bottom of the piston rod is equal to the inner diameter of the small inner diameter cylindrical structure, and can move up and down along the axial direction inside the small inner diameter cylindrical structure.

[0026] A crown spring is arranged inside the bottom of the piston rod, and the top boss of the electrode is inserted into the crown spring inside the bottom of the piston rod and clamped by the crown spring. The crown spring is composed of spring pieces in the circumferential direction and is evenly distributed, which can ensure that the electrode and the piston rod have good coaxiality, thereby improving the cutting quality. The top boss of the electrode can support the bottom surface of the piston rod and can contact and cooperate with the step surface at the bottom of the support seat to limit the position;

[0027] When the power source used is a high-frequency power source, a high-frequency diverter and a nozzle are provided at the bottom of the electrode, one end of the high-frequency diverter contacts the electrode, and the other end contacts the nozzle; the outer nozzle is connected to the bottom of the support seat by threads, and the inner step of the outer nozzle contacts the nozzle, so that the electrode, the high-frequency diverter and the nozzle are completely fixed, and at this time, the electrode and the nozzle are always kept in a separated state; so that the second air chamber formed between the high-frequency diverter and the outer nozzle, the gap between the nozzle and the outer nozzle, the radial small hole of the high-frequency diverter, the inner hole of the nozzle, the nozzle small hole and the axial small hole of the support seat are connected to form a gas channel, so as to provide the required air gap for the machine when high-frequency arc is struck;

[0028] When the power source used is a non-high-frequency power source, a non-high-frequency diverter and a nozzle are provided at the bottom of the electrode, one end of the non-high-frequency diverter contacts the bottom of the support seat, and the other end contacts the nozzle; the outer nozzle is connected to the bottom of the support seat by a thread, and the internal step of the outer nozzle contacts the nozzle, thereby completely fixing the non-high-frequency diverter and the nozzle, so that the second air chamber formed between the high-frequency diverter and the outer nozzle, the gap between the nozzle and the outer nozzle, the radial holes of the high-frequency diverter, the inner holes of the nozzle, and the nozzle holes are connected to the axial holes of the support seat; at this time, the electrode is subjected to the elastic force of the compression spring and contacts the nozzle, and when a sufficient amount of gas flows in, the electrode will compress the compression spring and separate from the nozzle.

[0029] Furthermore, one end of the air pipe is connected to the threaded hole on the top of the top cover, and the other end is connected to the joint nut; the joint nut is a rotating body with good conductive properties, with a through hole in the center, which can accommodate the air pipe, and one end of the outside is provided with a thread that can be connected to the cable connector, and the other end is provided with a milled edge that can fix the gun head when connecting the cable connector.

[0030] Furthermore, the gun head can be used for bakelite injection molding and can also be used for a molded handle shell.

[0031] The beneficial effects of the present invention are: providing a plasma cutting gun head that is common to high-frequency and non-high-frequency, and the conversion between the high-frequency gun head and the non-high-frequency gun head can be achieved by simply replacing the diverter in the accessories, which saves costs on the one hand, and on the other hand, the coaxiality accuracy of the electrode and the crown spring is higher after matching, achieving a better cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of a plasma cutting gun head and high-frequency accessories using the present invention.

[0033] Figure 2 The figure is an exploded view of the plasma cutting gun head and high frequency accessories using the present invention.

[0034] Figure 3 It is a schematic diagram of gas flow using the plasma cutting gun head and high-frequency accessories of the present invention.

[0035] Figure 4 It is a cross-sectional view of a plasma cutting gun head and non-high frequency accessories using the present invention.

[0036] Figure 5 The figure is an exploded view of the plasma cutting gun head and non-high frequency accessories using the present invention.

[0037] Figure 6 It is a schematic diagram of gas flow using the plasma cutting gun head and non-high frequency accessories of the present invention.

[0038] Figure 7 It is a schematic diagram of the plasma cutting gun head of the present invention being used on a handle after injection molding.

[0039] Figure 8 It is a schematic diagram of using the plasma cutting gun head of the present invention directly on a handle.

[0040] in:

[0041] 1-Plasma cutting gun head 2-Electrode 3-Non-high frequency shunt

[0042] 4- Nozzle 5- External nozzle 6- High frequency diverter

[0043] 7-Joint nut 8-Trachea 9-Injection bakelite

[0044] 10-top cover 11-compression spring 12-piston rod

[0045] 13-first O-ring 14-second O-ring 15-support seat

[0046] 16-Crown Spring

[0047] 21-threaded hole of top cover 22-radial small hole of top cover 23-first air chamber

[0048] 24- axial small hole of support seat 25- second air chamber 26- radial small hole of diverter

[0049] 27-Inner hole of nozzle 28-Gap between nozzle and outer nozzle 29-Small hole of nozzle DETAILED DESCRIPTION

[0050] The plasma cutting gun head and its accessories used for high frequency and non-high frequency of the present invention are further described in detail in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] The invention discloses a plasma cutting gun head and accessories thereof which are common to high frequency and non-high frequency. The conversion between the high frequency plasma cutting gun head and the non-high frequency plasma cutting gun head is realized by replacing a diverter.

[0053] The high-frequency plasma cutting gun head includes a support seat 15, which is made of a conductive material and includes a large inner diameter cylindrical structure at the top and a small inner diameter cylindrical structure at the bottom. A plurality of support seat axial small holes 24 are opened from top to bottom in the side wall of the small inner diameter cylindrical structure. The top of the support seat axial small hole 24 is connected to the cavity of the large inner diameter cylindrical structure, and the bottom is connected to the bottom end of the small inner diameter cylindrical structure.

[0054] A top cover 10 is arranged inside the large inner diameter cylindrical structure. The top cover 10 is made of a conductive material. The outer side of the top is interference fit with the inner side of the top of the support seat 15. A threaded hole connected to the air pipe 8 is provided at the center of the top of the top cover 10. One or more radial holes 22 in the top cover that are connected to the threaded hole are provided on the side wall of the top cover at the bottom of the threaded hole for gas circulation. One end of the air pipe 8 is connected to the threaded hole at the top of the top cover 10, and the other end is connected to the joint nut 7. No arc starting wire is required on the gun head. The arc is started by contacting the nozzle and the workpiece to be cut, and then further transferred to a cutting arc. The joint nut 7 is a rotating body with good conductive properties. There is a through hole in the center. The through hole can accommodate the air pipe 8. One end of the outside is provided with a thread that can be connected to the cable connector. The other end is provided with a milling edge that can fix the gun head when the cable connector is connected.

[0055] The bottom of the top cover 10 is provided with a blind hole capable of accommodating the compression spring 11, and the bottom surface of the blind hole supports the compression spring 11. The outer circle of the bottom of the top cover 10 is gap-matched with the inner side surface of the large inner diameter cylindrical structure, forming a first air chamber 23 connected with the radial small hole 22 of the top cover and the axial small hole 24 of the support seat.

[0056] A piston rod 12 is arranged in the support seat 15. The piston rod 12 is made of a conductive material and is a hollow rod-shaped structure. The top boss of the piston rod 12 is inserted into the compression spring 11. The top boss surface of the piston rod 12 can support the compression spring 11 and can contact and limit with the step surface at the bottom of the top cover 10. The outer diameter of the compression spring is smaller than the inner diameter of the blind hole of the top cover, and its inner diameter is larger than the outer diameter of the piston rod boss. The bottom of the piston rod 12 is inserted into the small inner diameter cylindrical structure, and the outer diameter of the bottom of the piston rod 12 is equal to the inner diameter of the small inner diameter cylindrical structure, and can move up and down axially inside the small inner diameter cylindrical structure.

[0057] A crown spring 16 is provided inside the bottom of the piston rod 12, and the top boss of the electrode 2 is inserted into the crown spring 16 inside the bottom of the piston rod 12 and clamped by the crown spring 16. The crown spring is composed of spring pieces in the circumferential direction and is evenly distributed, which can ensure that the electrode and the piston rod have good coaxiality, thereby improving the cutting quality. The top boss surface of the electrode 2 can support the bottom surface of the piston rod 12 and can contact and cooperate with the step surface at the bottom of the support seat 15 for limiting.

[0058] After the support seat and the top cover are interference fit, the piston rod is restricted between the support seat and the top cover, the compression spring is compressed between the piston rod and the top cover, and the piston rod can slide axially in the inner hole of the support seat and be acted upon by the elastic force of the compression spring.

[0059] like Figure 1-3 As shown, when the high-frequency diverter 6 is used, the electrode 2 is provided with the high-frequency diverter 6 and the nozzle 4 at the bottom, and one end of the high-frequency diverter 6 contacts the electrode 2, and the other end contacts the nozzle 4. The outer nozzle 5 is connected to the support seat 15 of the plasma cutting gun head 1 by threading, and its internal step contacts the nozzle 4, so that the electrode 2, the diverter 6 and the nozzle 4 are completely fixed. At this time, the electrode 2 and the nozzle 4 are always kept separated. The gas flows into the top cover threaded hole 21 through the gas pipe 8, flows into the first air chamber 23 formed by the top cover 10, the support seat 15 and the piston rod 12 through the radial small hole 22 connected to the threaded hole 21, and then flows into the second air chamber 25 formed by the diverter 6 and the outer nozzle 5 through the axial small hole 24 inside the support seat 15. A part of the gas passes through the radial small hole 26 of the diverter 6 to generate vortex, and flows into the inner hole 27 of the nozzle, and then flows out from the nozzle small hole 29 to form a cutting airflow. Another part of the gas flows out through the gap 28 between the outer nozzle 5 and the nozzle 4 to form a cooling airflow.

[0060] like Figure 4-6As shown, when the power source used is a non-high-frequency power source, the rest of the structure is the same as above, and only a non-high-frequency diverter 3 needs to be replaced. One end of the non-high-frequency diverter 3 contacts the support seat 15, and the other end contacts the nozzle 4. The outer nozzle 5 is connected to the support seat 15 of the plasma cutting gun head 1 through a thread, and its internal step contacts the nozzle 4, so that the non-high-frequency diverter 3 and the nozzle 4 are completely fixed. At this time, the electrode 2 is subjected to the elastic force of the compression spring 11 and contacts the nozzle 4. When there is enough gas flow, the electrode 2 will separate from the nozzle 4. The gas flows into the top cover threaded hole 21 through the air pipe 8, and flows into the first air chamber 23 formed by the top cover 10, the support seat 15 and the piston rod 12 through the radial small hole 22 connected to the threaded hole 21. On the one hand, the piston rod 12 is pushed to slide axially to the far end. On the other hand, it flows into the second air chamber 25 formed by the diverter 3 and the outer nozzle 5 through the axial small hole 24 inside the support seat 15. A part of the gas passes through the radial holes 26 of the flow divider 3 to generate eddy currents and flows into the inner hole 27 of the nozzle, which pushes the electrode 2 to slide toward the axial distal end on the one hand, and flows out through the nozzle holes 29 on the other hand to form a cutting gas flow. The remaining part of the gas flows out through the gap 28 between the outer nozzle 5 and the nozzle 4 to form a cooling gas flow. When the gas source is closed, the compression spring 11 releases the elastic force and the rebound force, pushing the piston rod 12 to reset to the axial proximal end, and at the same time, the electrode 2 is clamped by the crown spring 16 and resets together, contacting the nozzle 4.

[0061] The high-frequency shunt 6 and the non-high-frequency shunt 3 may be made of ceramic, bakelite, bakelite, PEEK or VESPER.

[0062] Embodiment 2: The plasma cutting gun head used for high frequency and non-high frequency cutting of the present invention can be injection molded. Figure 7 shown.

[0063] Embodiment 3: The plasma cutting gun head used for high frequency and non-high frequency cutting of the present invention can also be assembled in a handle for use. Figure 8 shown.

[0064] The above are only preferred embodiments 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 principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A plasma cutting gun head for high frequency and non-high frequency, characterized in that: The support seat (15) comprises an upper cylindrical structure with a large inner diameter and a lower cylindrical structure with a small inner diameter, and a plurality of support seat axial small holes (24) are opened from top to bottom in the side wall of the cylindrical structure with a small inner diameter; the top of the support seat axial small hole (24) is connected to the cavity of the cylindrical structure with a large inner diameter, and the bottom is connected to the bottom end of the cylindrical structure with a small inner diameter; A top cover (10) is arranged inside the large inner diameter cylindrical structure, the outer side of the top of the top cover (10) is interference fit with the inner side of the top of the support seat (15), a threaded hole connected to the air pipe (8) is opened at the center of the top of the top cover (10), and one or more top cover radial small holes (22) connected to the threaded hole are opened on the side wall of the top cover at the bottom of the threaded hole to allow gas to flow; The bottom of the top cover (10) is provided with a blind hole capable of accommodating a compression spring (11), and the bottom surface of the blind hole supports the compression spring (11); the outer circle of the bottom of the top cover (10) is clearance-matched with the inner side surface of the large inner diameter cylindrical structure, forming a first air chamber (23) that is in communication with the radial small hole (22) of the top cover and the axial small hole (24) of the support seat; A piston rod (12) is arranged in the support seat (15), and the piston rod (12) is a hollow rod-shaped structure. The top boss of the piston rod (12) is inserted into the compression spring (11). The top boss surface of the piston rod (12) can support the compression spring (11) and can contact and cooperate with the step surface at the bottom of the top cover (10) to limit the position; the bottom of the piston rod (12) is inserted into the small inner diameter cylindrical structure, and the outer diameter of the bottom of the piston rod (12) is equal to the inner diameter of the small inner diameter cylindrical structure, and can move up and down along the axial direction inside the small inner diameter cylindrical structure; A crown spring (16) is arranged on the inner side of the bottom of the piston rod (12); the top boss of the electrode (2) is inserted into the crown spring (16) on the inner side of the bottom of the piston rod (12) and is clamped by the crown spring (16); the top boss surface of the electrode (2) can support the bottom surface of the piston rod (12) and can contact and cooperate with the step surface at the bottom of the support seat (15) to limit the position; When the power source used is a high-frequency power source, a high-frequency shunt (6) and a nozzle (4) are provided at the bottom of the electrode (2), one end of the high-frequency shunt (6) contacts the electrode (2), and the other end contacts the nozzle (4); the outer nozzle (5) is connected to the bottom of the support seat (15) by means of a thread, and the inner step of the outer nozzle (5) contacts the nozzle (4), thereby completely fixing the electrode (2), the high-frequency shunt (6) and the nozzle (4), and at this time, the electrode (2) and the nozzle (4) are always kept in a separated state; so that the second air chamber (25) formed between the high-frequency shunt (6) and the outer nozzle (5), the gap between the nozzle (4) and the outer nozzle (5), the radial small hole (26) of the high-frequency shunt, the inner hole (27) of the nozzle, the small hole (29) of the nozzle and the axial small hole (24) of the support seat are connected; When the power source used is a non-high-frequency power source, a non-high-frequency diverter (3) and a nozzle (4) are provided at the bottom of the electrode (2), one end of the non-high-frequency diverter (3) contacts the bottom of the support seat (15), and the other end contacts the nozzle (4); the outer nozzle (5) is connected to the bottom of the support seat (15) by means of a thread, and the inner step of the outer nozzle (5) contacts the nozzle (4), thereby completely fixing the non-high-frequency diverter (3) and the nozzle (4), so that the second air chamber (25) formed between the high-frequency diverter (6) and the outer nozzle (5), the gap between the nozzle (4) and the outer nozzle (5), the radial small hole (26) of the high-frequency diverter, the inner hole (27) of the nozzle, the small hole (29) of the nozzle and the axial small hole (24) of the support seat are connected; at this time, the electrode (2) is subjected to the elastic force of the compression spring (11) and contacts the nozzle (4), and when a sufficient amount of gas flows in, the electrode (2) will compress the compression spring (11) and separate from the nozzle (4); One end of the air pipe (8) is connected to the threaded hole on the top of the top cover (10), and the other end is connected to the joint nut (7); the joint nut (7) has a through hole in the center, the through hole can accommodate the air pipe (8), one end of the outside is provided with a thread, which can be connected to the cable connector, and the other end is provided with a milled edge, which can fix the gun head when the cable connector is connected; The gun head can be used for bakelite injection molding and can also be used for a molded handle shell.

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