High frequency plasma cutting gun

Abstract

The present invention discloses a high-frequency plasma cutting gun, wherein the large inner diameter cylindrical structure of the gun head body has an injection molded body, an insulator, a diverter, a flow guide tube, an electrode and a cutting nozzle inside, the injection molded body and the large inner diameter cylindrical structure are anti-rotationally matched, the diverter boss is inserted into the injection molded body, the flow guide tube is installed in the diverter cavity, a flow guide cavity is inside the flow guide tube, the electrode is arranged outside the flow guide tube and has an annular airflow gap between the electrode and the flow guide tube, a first diverter channel is provided on the diverter, the first diverter channel is connected to the diverter cavity, a second diverter channel is provided between the insulator and the protective cap, the cutting nozzle is connected to the bottom of the electrode, a vortex ring is provided between the cutting nozzle and the diverter, a vortex hole is provided on the surface of the vortex ring, and a plasma arc gap is provided between the electrode and the cutting nozzle. In the above manner, the high-frequency plasma cutting gun of the present invention has anti-slip and anti-rotation characteristics, the gun head is replaceable, and the airflow fully surrounds and refluxes to various parts of the gun head, effectively reducing the high temperature of the gun head and consumables and improving the service life.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to a high-frequency plasma cutting gun. Background Art

[0002] The existing high-frequency plasma gun heads have many shortcomings in production: the gun head molding is complex, the parts are numerous, the manufacturing cost is high, and some parts cannot be repaired if damaged.

[0003] 1) Gun tip molding is complex: Gun tip molding requires a dedicated injection molding machine to perform injection molding operations to form an injection molded body to shape and insulate the gun tip. This requires a dedicated injection molding machine, which places high precision requirements on the initial parts and components, and results in high production costs.

[0004] 2) Parts cannot be replaced and the damage rate is high: the insulator is pressed into the inside of the gun head and is bonded to the surrounding metal parts through injection molding. If it is damaged and cannot be replaced, the entire gun head will be scrapped;

[0005] 3) Many parts and high manufacturing cost: The joints at the tail of the trachea are complicated and numerous. After being assembled using the rolling process, threaded joints are screwed in. This leads to too many joints at the tail, multiple joints, and multiple parts, which increases the manufacturing cost. The structure tends to be complicated, increasing the risk of air leakage. Summary of the Invention

[0006] The main technical problem solved by the present invention is to provide a high-frequency plasma cutting gun with anti-escape and anti-rotation characteristics. The gun head can be replaced and repaired to extend the service life of the gun head. The airflow inside the gun head fully surrounds and refluxes to all parts of the gun head, effectively reducing the high temperature of the gun head and consumables and improving their service life.

[0007] In order to solve the above technical problems, the present invention adopts a technical solution: providing a high-frequency plasma cutting gun, comprising: a gun head body, the gun head body comprising a large inner diameter cylindrical structure, the cavity of the large inner diameter cylindrical structure is sequentially assembled with an injection molded body, an insulator, a diverter, a flow guide tube, an electrode and a cutting nozzle,

[0008] The top of the injection molding body is locked in contact with the large inner diameter cylindrical structure. The boss on the top of the diverter is inserted into the bottom of the injection molding body. The guide tube is installed in the inner cavity of the diverter. The guide tube has a guide cavity inside to form an air flow channel. The electrode sleeve is arranged outside the guide tube and has an annular air flow gap between it and the guide tube.

[0009] The diverter is provided with a first diverter channel, which is connected to the inner cavity of the diverter. An insulator is provided between the protective cap outside the large inner diameter cylindrical structure and the diverter, and a second diverter channel is provided between the insulator and the protective cap.

[0010] The cutting nozzle is connected to the bottom end of the electrode. A vortex ring is provided between the cutting nozzle and the diverter. The surface of the vortex ring is evenly distributed with vortex holes. A plasma arc gap is provided between the electrode and the cutting nozzle for blowing out the plasma arc.

[0011] In a preferred embodiment of the present invention, a first step surface is provided at the junction of the top of the diverter and the injection molded body. The injection molded body contacts and cooperates with the boss at the top of the diverter via the first step surface. The injection molded body is injection molded using insulating resin glue.

[0012] In a preferred embodiment of the present invention, the inner side of the top end portion of the large inner diameter cylindrical structure has an arc-shaped protrusion, and the outer side of the top end portion of the injection molding body has an arc-shaped groove that matches the arc-shaped protrusion. When the large inner diameter cylindrical structure is connected to the injection molding body, the arc-shaped protrusion at the top end is embedded in the arc-shaped groove to form a anti-rotation fit.

[0013] In a preferred embodiment of the present invention, a second step surface is provided at the junction of the shunt and the first insulator, and the first insulator and the shunt are in contact and fit via the second step surface.

[0014] In a preferred embodiment of the present invention, the top end of the flow guide tube is provided with a first external thread, the junction of the flow diverter and the flow guide tube is provided with a first internal thread, and the flow guide tube and the flow diverter are threadedly connected.

[0015] In a preferred embodiment of the present invention, the junction between the bottom end of the flow guide tube and the electrode has an arc surface, and the bottom end of the flow guide tube and the electrode are in contact through the arc surface.

[0016] In a preferred embodiment of the present invention, a second external thread is provided at the top end of the electrode, a second internal thread is provided at the junction of the diverter and the electrode, and the diverter and the electrode are connected by threads.

[0017] In a preferred embodiment of the present invention, the insulator and the gun head body are separated, and the insulator includes a first insulator and a second insulator which are separated. The first insulator and the second insulator are separated.

[0018] A third internal thread is formed on the bottom of the first insulator, and a third external thread is formed on the top of the second insulator. The first insulator and the second insulator are connected by threads.

[0019] In a preferred embodiment of the present invention, the gun head body also includes an air pipe, which is inserted into the injection molded body and the diverter and communicates with the guide tube. The tail of the air pipe is connected to the tail connector by threaded buckle.

[0020] In a preferred embodiment of the present invention, the gas flows into the air flow channel inside the guide tube through the air pipe, and then flows into the annular air flow gap between the guide tube and the electrode for reflux.

[0021] Then it flows out from the first diversion channel of the diverter, passes through the second diversion channel between the insulator and the protective cap, surrounds the vortex ring to generate vortex, and then passes through the vortex holes on the surface of the vortex ring into the plasma arc gap between the electrode and the cutting nozzle, blowing out the plasma arc to form a cutting arc.

[0022] The beneficial effects of the present invention are as follows: the high-frequency plasma cutting gun of the present invention has anti-escape and anti-rotation characteristics, the gun head can be replaced and repaired after the insulator is damaged, thereby extending the service life of the gun head, and the air flow fully surrounds and refluxes to all parts of the gun head, effectively reducing the high temperature of the gun head and consumables and increasing their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0024] Figure 1 It is a structural schematic diagram of a preferred embodiment of a high-frequency plasma cutting gun of the present invention;

[0025] Figure 2 yes Figure 1 A partial enlarged view of middle A;

[0026] The components in the accompanying drawings are marked as follows: 1. cutting nozzle, 2. electrode, 201. second external thread, 202. plasma arc gap, 3. swirl ring, 4. protective cap, 5. diverter, 501. first step surface, 502. second step surface, 503. first internal thread, 504. second internal thread, 505. first diversion channel, 506. second diversion channel, 6. flow guide tube, 601. first external thread, 602. arc surface, 603. air flow channel, 604. annular air flow gap, 7. insulator, 701. first insulator, 702. second insulator, 703. third internal thread, 704. fourth external thread, 8. injection molding body, 801. arc groove, 9. air pipe, 10. tail joint, 11. large inner diameter cylindrical structure, 1101. arc protrusion. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figures 1 to 2 , embodiments of the present invention include:

[0029] A high-frequency plasma cutting gun includes a gun head body, which includes a large inner diameter cylindrical structure 11, and an injection molded body 8, an insulator 7, a diverter 5, a flow guide tube 6, an electrode 2 and a cutting nozzle 1 are sequentially assembled inside the cavity of the large inner diameter cylindrical structure 11.

[0030] The gun head body also includes an air pipe 9, which is inserted into the injection molded body 8 and the diverter 5 and communicates with the guide tube. The tail of the air pipe 9 is connected to the tail connector 10 by threaded buckle, which is simple and efficient, saves costs and reduces the risk of air leakage.

[0031] The injection molded body 8 is molded inside the large inner diameter cylindrical structure 11. The injection molded body 8 is injection molded using insulating resin glue. The insulating resin glue has high hardness and good molding. After the trachea 9 is inserted into the injection molded body 8, the colloid is strong and hard after solidification, which can ensure that the trachea 9 is not easy to loosen or rotate.

[0032] Furthermore, the top of the injection molding body 8 and the contact point of the large inner diameter cylindrical structure 11 are anti-rotationally matched: the inner side of the top of the large inner diameter cylindrical structure 11 has an arc-shaped protrusion 1101, and the outer side of the top of the injection molding body 8 has an arc-shaped groove 801 that matches the arc-shaped protrusion 1101.

[0033] When the large inner diameter cylindrical structure 11 is connected to the injection molded body 8, the arc-shaped protrusion 1101 at the top is embedded in the arc-shaped groove 801 to form a rotation-proof fit, further ensuring that the trachea 9 has anti-escape and anti-rotation properties after being inserted into the injection molded body 8 and the large inner diameter cylindrical structure 11.

[0034] The boss at the top of the diverter 5 is inserted into the bottom of the injection molding body 8, wherein a first step surface 501 is provided at the junction of the top of the diverter 5 and the injection molding body 8. The injection molding body 8 and the boss at the top of the diverter are in contact and fit through the first step surface 501, which can limit the upward movement of the diverter 5.

[0035] An insulator 7 is provided between the protective cap 4 and the diverter 5 outside the large inner diameter cylindrical structure 11 , and the insulator 7 is separated from the gun head body.

[0036] The insulator 7 includes a first insulator 701 and a second insulator 702 which are separately arranged. The first insulator 701 and the second insulator 702 are separately arranged to ensure that the insulator 7 can be replaced after being damaged, thereby extending the service life of the gun head.

[0037] A second step surface 502 is provided at the junction of the diverter 5 and the first insulator 701 . The first insulator 701 and the diverter 5 are in contact and fit with each other via the second step surface 502 , which can further restrict the diverter 5 from moving upward.

[0038] The guide tube 6 is installed in the inner cavity of the diverter 5. The top end of the guide tube 6 is provided with a first external thread 601. The junction between the diverter 5 and the guide tube 6 is provided with a first internal thread 503. The guide tube 6 and the diverter 5 are threadedly connected.

[0039] The electrode 2 is sleeved outside the flow guide tube 6 . The bottom end of the flow guide tube 6 and the electrode 2 are connected at a circular arc surface 602 . The bottom end of the flow guide tube 6 and the electrode 2 are in contact through the circular arc surface 602 .

[0040] The top end of the electrode 2 is provided with a second external thread 201 , and the junction of the diverter 5 and the electrode 2 is provided with a second internal thread 504 , so the diverter 5 and the electrode 2 are connected by threads.

[0041] A third internal thread 703 is formed at the bottom of the first insulator 701 , and a third external thread 704 is formed at the top of the second insulator 702 . The first insulator 701 and the second insulator 702 are connected by threads.

[0042] The flow guide tube 6 has a flow guide cavity inside to form an air flow channel 603. There is an annular air flow gap 604 between the electrode 2 and the flow guide tube 6. The diverter 5 is provided with a first diverter channel 505, which is connected to the inner cavity of the diverter 5. A second diverter channel 506 is provided between the insulator 7 and the protective cap 4.

[0043] The cutting nozzle 1 is connected to the bottom end of the electrode 2. A vortex ring 3 is provided between the cutting nozzle 1 and the diverter 5. The surface of the vortex ring 3 is evenly distributed with vortex holes. There is a plasma arc gap 202 between the electrode 2 and the cutting nozzle 1 to blow out the plasma arc.

[0044] The above-mentioned air flow channel 603, annular air flow gap 604, first diversion channel 505, second diversion channel 506, vortex hole and plasma arc gap 202 together form a gas path for gas circulation, which can ensure that the gas fully circulates back to all parts of the gun tip, reducing the high temperature of the gun tip and consumables.

[0045] In the present invention, the insulator 7 and the eddy current ring 3 are made of polymer materials, which are wear-resistant and high-temperature-resistant, have high mechanical strength, good insulation, are durable, and are easy to replace.

[0046] The working principle of the high-frequency plasma cutting gun of the present invention is:

[0047] The gas flows into the air flow channel 603 inside the guide tube 6 through the air pipe 9, and then flows into the annular air flow gap 604 between the guide tube 6 and the electrode 2 for reflux.

[0048] Then it flows out from the first diversion channel 505 of the diverter 5, passes through the second diversion channel 506 between the insulator 7 and the protective cap 4, surrounds the vortex ring 3 to generate vortex, and then passes through the vortex holes on the surface of the vortex ring 3 into the plasma arc gap 202 between the electrode 2 and the cutting nozzle 1, blowing out the plasma arc to form a cutting arc.

[0049] The beneficial effects of the high-frequency plasma cutting gun of the present invention are:

[0050] It is injection molded with insulating resin glue and has a rotation-stopping fit with a large inner diameter cylindrical structure, which has anti-slip and anti-rotation properties. It does not require a dedicated injection molding machine for injection molding, which simplifies the manufacturing process and effectively solves the problem of similar products causing gun tip failure due to continuous high temperature at the tail under abnormal welding conditions.

[0051] The insulator and the gun head are separated. If the insulator is damaged, the gun head can be replaced and repaired to extend the service life of the gun head.

[0052] The airflow channel inside the gun head fully surrounds and refluxes to all parts of the gun head, effectively reducing the high temperature of the gun head and consumables and increasing their lifespan.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-frequency plasma cutting gun, comprising: The gun head body is characterized in that The main body of the gun head includes a large inner diameter cylindrical structure, and the cavity of the large inner diameter cylindrical structure is sequentially assembled with an injection molded body, an insulator, a diverter, a flow guide tube, an electrode and a cutting nozzle. The top of the injection molding body is locked in contact with the large inner diameter cylindrical structure. The boss on the top of the diverter is inserted into the bottom of the injection molding body. The guide tube is installed in the inner cavity of the diverter. The guide tube has a guide cavity inside to form an air flow channel. The electrode sleeve is arranged outside the guide tube and has an annular air flow gap between it and the guide tube. The insulator and the gun head body are separated, and the insulator includes a first insulator and a second insulator which are separated. The first insulator and the second insulator are separated. The bottom of the first insulator forms a third internal thread, the top of the second insulator forms a third external thread, and the first insulator and the second insulator are connected by threads. The top end of the guide tube is provided with a first external thread, the junction of the diverter and the guide tube is provided with a first internal thread, and the guide tube and the diverter are connected by threads. The top of the electrode is provided with a second external thread, and the junction of the diverter and the electrode is provided with a second internal thread, and the diverter and the electrode are connected by threads. The diverter is provided with a first diverter channel, which is connected to the inner cavity of the diverter. An insulator is provided between the protective cap outside the large inner diameter cylindrical structure and the diverter, and a second diverter channel is provided between the insulator and the protective cap. The cutting nozzle is connected to the bottom end of the electrode. A vortex ring is provided between the cutting nozzle and the diverter. The surface of the vortex ring is evenly distributed with vortex holes. There is a plasma arc gap between the electrode and the cutting nozzle to blow out the plasma arc. A first step surface is provided at the junction of the top of the diverter and the injection molding body, the injection molding body and the boss on the top of the diverter are in contact and matched via the first step surface, and the injection molding body is injection-molded by insulating resin glue; A second step surface is provided at the junction of the shunt and the first insulator, and the first insulator and the shunt are in contact and fit via the second step surface; The inner side of the top of the large inner diameter cylindrical structure has an arc-shaped protrusion, and the outer side of the top of the injection molding body has an arc-shaped groove that matches the arc-shaped protrusion. When the large inner diameter cylindrical structure is connected to the injection molding body, the arc-shaped protrusion at the top is embedded in the arc-shaped groove to form a rotation-stop fit.

2. The high-frequency plasma cutting gun according to claim 1, characterized in that: The joint between the bottom end of the flow guide tube and the electrode has an arc surface, and the bottom end of the flow guide tube and the electrode are in contact through the arc surface.

3. The high-frequency plasma cutting gun according to claim 1, characterized in that: The gun head body also includes an air pipe, which is inserted into the injection molded body and the diverter and communicates with the guide pipe. The tail of the air pipe is connected with a tail connector by threaded buckle.

4. The high-frequency plasma cutting gun according to any one of claims 1 to 3, characterized in that: The gas flows into the air flow channel inside the guide tube through the air pipe, and then flows into the annular air flow gap between the guide tube and the electrode for reflux. Then it flows out from the first diversion channel of the diverter, passes through the second diversion channel between the insulator and the protective cap, surrounds the vortex ring to generate vortex, and then passes through the vortex holes on the surface of the vortex ring into the plasma arc gap between the electrode and the cutting nozzle, blowing out the plasma arc to form a cutting arc.

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