CN112756125A

CN112756125A - Plasma spraying device and method

Info

Publication number: CN112756125A
Application number: CN202011581056.2A
Authority: CN
Inventors: 汪嵘; 王井彩; 黄永海
Original assignee: Anhui Zhongke Dayu Technology Co ltd
Current assignee: Anhui Zhongke Dayu Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-05-07

Abstract

The invention discloses a plasma spraying device and a plasma spraying method, which comprise a plasma spray gun, a gas tank and a powder feeder, wherein the plasma spray gun comprises a gun body, one end of the gun body is connected with one end of an atomizing cap, the other end of the atomizing cap is provided with a spray head, and the spray head is provided with a spray nozzle; a coating inlet is arranged between the gun body and the atomizing cap, and an adjusting valve is arranged on the coating inlet; one end of the gun body, which is far away from the spray head, is connected with a handle, a trigger is movably arranged on the handle, one side of the handle is provided with a spray amplitude adjusting knob, a spray flow adjusting knob is arranged below the spray amplitude adjusting knob, the lower end surface of the handle is provided with a gas inlet, and one side of the gas inlet is provided with a gas adjusting knob; the coating inlet is connected with a powder feeder, and spraying materials are conveyed into the spray head for heat treatment; the gas inlet is connected with a gas tank; the invention belongs to the technical field of spraying equipment.

Description

Plasma spraying device and method

Technical Field

The invention belongs to the technical field of mechanical products, and particularly relates to a plasma spraying device and a plasma spraying method.

Background

Plasma spraying is another new, versatile precision spraying method that follows flame spraying. The method uses electric energy to convert mixed gas such as argon, hydrogen or helium into high-temperature plasma, forms plasma gas flow in an anode, and sprays metal or metal oxide and metal carbide on the surface of a workpiece by using the high-temperature and high-speed plasma gas flow to form a coating. The plasma spraying method is suitable for spraying high-melting-point materials, the speed of spraying particles is high, the coating is compact, the bonding strength is high, and the spraying materials are not easy to oxidize due to the fact that inert gas is used as working gas. Most industrial atmospheric plasma spray equipment therefore prefers this method of spraying.

The plasma spraying device with the publication number of CN109023217B comprises a base, a workbench, a protective cover and a mixing box, wherein electric hydraulic cylinders are mounted at the tops of the base through bolts, coating boxes are mounted between the electric hydraulic cylinders through mounting plates, pressure pumps are arranged at the tops of the coating boxes through mounting pieces, the workbench is mounted on output shafts of the electric hydraulic cylinders through the bolts, a level sensor is arranged on one side of the workbench through a mounting groove, the protective cover is connected to the top of the workbench through a rotating shaft, an air inlet is formed in one side of the protective cover, a cooling fan is mounted in the air inlet through a screw, a temperature controller is arranged on the inner top of the protective cover through the mounting groove, and a plasma generator is mounted at the inner bottom of the protective cover through a; in order to solve the problems, the plasma spraying device has a large size, is inconvenient to use, and is inconvenient to switch spraying materials; to this end, a solution is now provided.

Disclosure of Invention

The invention aims to provide a plasma spraying device and a plasma spraying method.

The purpose of the invention can be realized by the following technical scheme: a plasma spraying device comprises a plasma spray gun, a gas tank and a powder feeder, wherein the plasma spray gun comprises a gun body, one end of the gun body is connected with one end of an atomizing cap, the other end of the atomizing cap is provided with a spray head, and the spray head is provided with a spray nozzle; a coating inlet is arranged between the gun body and the atomizing cap, and an adjusting valve is arranged on the coating inlet; one end of the gun body, which is far away from the spray head, is connected with a handle, a trigger is movably arranged on the handle, one side of the handle is provided with a spray amplitude adjusting knob, a spray flow adjusting knob is arranged below the spray amplitude adjusting knob, the lower end surface of the handle is provided with a gas inlet, and one side of the gas inlet is provided with a gas adjusting knob; the coating inlet is connected with a powder feeder, and the gas inlet is connected with a gas tank.

Further, atomizing cap one end surface is provided with the screw thread, rifle body one end is provided with the screw thread mounting hole, atomizing cap spiro union is on the screw thread mounting hole, atomizing cap bilateral symmetry is provided with the locator card post, be provided with the coating orifice between the locator card post, coating orifice bilateral symmetry is provided with a plurality of atomization holes.

Further, coating entry surface is provided with first connector and second connector, first connector and second connector all set up in coating entry downside, coating entry one side port is installed the governing valve, including the knob, be provided with the hollow tube on the knob, the feed port has all been seted up with terminal surface down to the hollow tube up end, the cover is equipped with the sealing washer on the hollow tube, and a sealing washer and a knob side surface laminating.

Furthermore, the handle is divided into a first part and a second part, a positioning block is arranged between the first part and the second part, the height of the positioning block is smaller than that of the lower end face of the trigger, and insulating paint is coated on the surface of the handle.

Further, the one end that the handle is close to the rifle body is provided with the axis of rotation, the axis of rotation runs through handle movable mounting on the handle, trigger upper end bilateral symmetry is provided with the installation piece, two the mounting hole has all been seted up on the installation piece, the trigger passes through the mounting hole cup joint in the axis of rotation, the trigger surface has been seted up and has been penetrated the hole site.

Further, a first connecting rod is arranged on one side surface of the spraying amplitude adjusting knob, a thread is arranged on one end surface, close to the spraying amplitude adjusting knob, of the first connecting rod, a spring is sleeved on the first connecting rod, a first packing block is installed at one end of the first connecting rod, a spring fixing ring is installed between the first packing block and the spring, one end of the spring is connected with the first connecting rod, the other end of the spring is connected with the spring fixing ring, and the first packing block is attached to the inner side of the atomizing cap.

Further, spraying flow control knob side surface is provided with the second connecting rod, the second connecting rod is provided with the screw near the one end surface of spraying flow control knob, the second connecting rod passes to pierce through the hole site and extends to the internal extension of rifle and links to each other with the second compels tight piece, the second compels tight piece and is located coating entry top.

Further, the powder feeder comprises a first storage box and a second storage box, the first storage box is connected with the first connector through a first paint conveying pipe, and the second storage box is connected with the second connector through a second paint conveying pipe.

Further, the gas inlet is communicated with a gas channel, a threaded hole is formed in the surface of the gas channel, a third connecting rod is arranged on the gas adjusting knob, the third connecting rod penetrates through the lower end of the handle and is installed on the threaded hole, and the gas inlet is connected with a gas tank through a gas pipe; the air channel is close to the trigger and is provided with an air valve, one end of the air valve is embedded and installed on the air channel, and one end of the air valve is adjusted to the inside of the air channel through rotating the air valve, so that the air channel is closed, and the function of temporarily controlling air to enter is achieved.

A method of using a plasma spray device, the method of using comprising the steps of:

the first step is as follows: electrifying the device, enabling gas to enter the gas channel through the gas pipe by adjusting the air valve, and adjusting the gas flow by adjusting the gas adjusting knob;

the second step is that: starting a powder feeder, enabling two kinds of spraying materials to respectively enter a first storage box and a second storage box on the powder feeder, enabling the spraying materials to enter a coating inlet through a first conveying pipe and a second conveying pipe, adjusting a feeding hole to be opposite to a required spraying material connecting port by rotating an adjusting valve, enabling the spraying materials to enter a hollow pipe through the feeding hole, then enabling the spraying materials to reach a spray head through the coating inlet for heat treatment, and finally enabling the treated spraying materials to pass through an atomizing cap and then be sprayed out through a spray nozzle;

the third step: in the spraying process, the first connecting rod on the spray width adjusting knob moves inwards by rotating the spray width adjusting knob, so that the first pressing block at the front end is attached to the atomizing hole on the atomizing cap, and the spraying range of the spraying material is adjusted; through rotating spraying flow control knob, the second connecting rod on the spraying flow control knob moves inwards to make the second compel tight piece of front end realize hindering the coating import, and then influence spraying material's blowout volume.

The invention has the beneficial effects that:

1. the spray head is arranged on the gun body, the atomizing cap is arranged at the spray head, the spraying material reaches the spray head through the coating inlet for heat treatment, the spraying material after heat treatment is atomized by the atomizing cap and then is directly sprayed out of the spray nozzle, and meanwhile, the first packing block is enabled to interact with the atomizing hole on the atomizer by adjusting the spray amplitude adjusting knob, so that the spray amplitude and range of the spraying material are adjusted, and the spraying effect is changed; on the other hand, the structure of the spraying device can be simplified through the gun-shaped design by adjusting the spraying flow adjusting knob and the second packing block, so that the spraying device can be operated by hands and can adjust the spraying effect in real time according to the requirement;

2. the invention can simultaneously convey two different spraying materials to the paint inlet by arranging the first connector and the second connector at the paint inlet and respectively connecting the first connector and the second connector with the first storage box and the second storage box on the powder feeder, a regulating valve is arranged at one end of the paint inlet, a hollow pipe is arranged on the regulating valve, corresponding feed inlets are arranged on the upper surface and the lower surface of the hollow pipe, the positions of the two feed inlets are respectively opposite to the first connector and the second connector, the spraying material enters the first connector from the first storage box through the first conveying pipe and then enters the hollow pipe from the feed inlet, and then enters the paint inlet through a port on one side of the hollow pipe, meanwhile, the feeding hole at the second connector is positioned above the hollow pipe, so that the spraying material in the second storage box cannot enter the hollow pipe; when the spraying materials need to be converted, the regulating valve is rotated, the position of the corresponding feed inlet is adjusted to the required spraying materials, and the switching of the spraying materials can be realized.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the atomizing cap of the present invention;

FIG. 4 is a schematic view of a regulator valve according to the present invention;

FIG. 5 is a schematic view of the trigger construction of the present invention;

FIG. 6 is a schematic view of the structure of the spray amplitude adjusting knob of the present invention;

fig. 7 is a schematic structural view of a spray flow adjusting knob according to the present invention.

In the figure: 1. a gun body; 2. an atomizing cap; 201. positioning the clamp column; 202. an atomization orifice; 203. spraying a coating; 3. a spray head; 4. a nozzle; 5. a coating inlet; 6. adjusting a valve; 601. a knob; 602. a seal ring; 603. a feed port; 604. a hollow tube; 7. a first connector; 8. a second connector; 9. a grip; 10. a trigger; 1001. mounting blocks; 1002. mounting holes; 1003. penetrating hole sites; 11. a spray amplitude adjusting knob; 1101. a first connecting rod; 1102. a spring; 1103. a spring fixing ring; 1104. a first packing block; 12. spraying a flow adjusting knob; 1201. a second connecting rod; 1202. a second packing block; 13. a gas inlet; 14. a gas adjusting knob; 1401. a third connecting rod; 15. positioning blocks; 16. a powder feeder; 1601. a first storage box; 1602. a second storage box; 17. a gas tank; 18. a first paint delivery tube; 19. a second paint delivery tube; 20. a gas channel; 21. a rotating shaft; 22. an air valve.

Detailed Description

As shown in fig. 1-7, a plasma spraying device comprises a plasma spray gun, a gas tank 17 and a powder feeder 16, wherein the plasma spray gun comprises a gun body 1, one end of the gun body 1 is connected with one end of an atomizing cap 2, the other end of the atomizing cap 2 is provided with a spray head 3, and the spray head 3 is provided with a spray nozzle 4; a coating inlet 5 is arranged between the gun body 1 and the atomizing cap 2, and an adjusting valve 6 is arranged on the coating inlet 5; the end, far away from the spray head 3, of the gun body 1 is connected with a handle 9, the handle 9 is divided into a first part and a second part, a positioning block 15 is arranged between the first part and the second part, the height of the positioning block 15 is smaller than that of the lower end face of a trigger 10, insulating paint is coated on the surface of the handle, and the spray head 3 is prevented from generating an electric leakage condition and causing injury to a human body in the heating process by coating the insulating paint on the surface of the handle 9; a trigger 10 is movably mounted on the grip 9, a spray amplitude adjusting knob 11 is arranged on one side of the grip 9, a spray flow adjusting knob 12 is arranged below the spray amplitude adjusting knob 11, a gas inlet 13 is mounted on the lower end face of the grip 9, and a gas adjusting knob 14 is arranged on one side of the gas inlet 13; the coating inlet 5 is connected with a powder feeder 16, the gas inlet 13 is connected with a gas tank 17, and the gas tank 17 conveys corresponding gas into a gas channel 20 through a gas pipe.

The outer surface of one end of the atomizing cap 2 is provided with threads, one end of the gun body 1 is provided with a thread mounting hole 1002, the threads are matched with the thread mounting hole 1002, the atomizing cap 2 is in threaded connection with the thread mounting hole 1002, the two sides of the atomizing cap 2 are symmetrically provided with positioning clamp columns 201, a coating spray hole 203 is arranged between the positioning clamp columns 201, the two sides of the coating spray hole 203 are symmetrically provided with a plurality of atomizing holes 202, a spraying material is subjected to heat treatment in a spray head 3 through plasma, and then the spraying material is atomized through the atomizing holes 202 on the atomizing cap 2, so that the sprayed spraying material is more uniform and wider in range; the surface of the coating inlet 5 is provided with a first connector 7 and a second connector 8, the first connector 7 and the second connector 8 are both arranged at the lower side of the coating inlet 5, the first connector 7 and the second connector 8 are communicated with the coating inlet 5, a port at one side of the coating inlet 5 is provided with an adjusting valve 6, the adjusting valve 6 comprises a knob, the knob is provided with a hollow tube 604, the upper end surface and the lower end surface of the hollow tube 604 are both provided with feed holes, the hollow tube 604 is inserted into the coating inlet 5, the two feed holes 603 on the upper surface are respectively opposite to the first connector 7 and the second connector 8, when the adjusting valve 6 is rotated, the opposite direction of the feed holes 603 is adjusted, so that whether the spraying material can enter the hollow tube 604 through the first connector 7 and the second connector 8 and then enter the coating inlet 5 is controlled, the hollow tube 604 is sleeved with a sealing ring 602, the sealing ring 602 is attached to one side surface of the knob 601, and the knob 601 is sealed with one end of the coating inlet 5 through the sealing ring 602, so that the leakage of the spraying material is avoided; one end of the handle 9 close to the gun body 1 is provided with a rotating shaft 21, the rotating shaft 21 penetrates through the handle 9 and is movably installed on the handle 9, mounting blocks 1001 are symmetrically arranged on two sides of the upper end of the trigger 10, mounting holes 1002 are formed in the mounting blocks 1001, the trigger 10 is connected to the rotating shaft 21 in a sleeved mode through the mounting holes 1002, and penetrating hole sites 1003 are formed in the surface of the trigger 10.

11 side surface of spraying width adjust knob is provided with head rod 1101, head rod 1101 is close to the terminal surface of spraying width adjust knob 11 and is provided with the screw thread, spring 1102 has been cup jointed on head rod 1101, first compel tight piece 1104 is installed to the one end of head rod 1101, first compel tight piece 1104 and spring 1102 between install the solid fixed ring 1103 of spring, spring 1102's one end links to each other with head rod 1101, and spring 1102's the other end links to each other with solid fixed ring 1103 of spring, first compel

tight piece

1104 and 2 inboard laminating of atomizing cap.

The surface of one side of the spraying flow adjusting knob 12 is provided with a second connecting rod 1201, the surface of one end, close to the spraying flow adjusting knob 12, of the second connecting rod 1201 is provided with threads, the second connecting rod 1201 penetrates through the penetrating hole 1003 and extends into the gun body 1 to be connected with a second packing block 1202, the second packing block 1202 is located above the paint inlet 5, the second packing block 1202 moves towards the paint inlet 5 by rotating the knob, the second packing block 1202 blocks the paint inlet 5, the spraying flow of the spraying material is reduced, meanwhile, the knob is rotated in the opposite direction, the second packing block 1202 can be far away from the paint inlet 5, the spraying flow of the spraying material is increased, and the required spraying effect is obtained by controlling the spraying flow.

The powder feeder 16 comprises a first magazine 1601 and a second magazine 1602, the first magazine 1601 is connected with the first connector 7 through a first paint delivery pipe 18, the second magazine 1602 is connected with the second connector 8 through a second paint delivery pipe 19, the first magazine 1601 and the second magazine 1602 are arranged on the powder feeder 16 at the same time, and the first magazine 1601 and the second magazine 1602 can be filled with different spraying materials at the same time, so that the device can use and switch the two spraying materials at the same time; the gas inlet 13 is communicated with the gas channel 20, a threaded hole is formed in the surface of the gas channel 20, a third connecting rod 1401 is arranged on the gas adjusting knob 14, the third connecting rod 1401 penetrates through one side of the handle 9, the lower end of the third connecting rod 1401 is installed on the threaded hole, the third connecting rod 1401 on the gas adjusting knob 14 penetrates through the threaded hole and rotates into the gas channel 20, and the third connecting rod 1401 enters the gas channel 20 by rotating the gas adjusting knob 14, so that the third connecting rod 1401 blocks the gas channel 20 to a certain extent, and the gas flow adjusting effect is achieved; the gas inlet 13 is connected with a gas tank 17 through a gas pipe; an air valve 22 is installed at a position, close to the trigger 10, of the air passage 20, one end of the air valve 22 is embedded in the air passage 20, and one end of the air valve 22 is adjusted to the inside of the air passage 20 by rotating the air valve 22, so that the air passage 20 is closed, and air in the air passage 20 is prevented from flowing through.

the first step is as follows: the device is electrified, air enters the air channel 20 through the air pipe by adjusting the air valve 22, and the third connecting rod 1401 extends into the air channel 20 by adjusting the air adjusting knob 14 in the using process, so that a certain blocking effect is formed, and the air flow is adjusted;

the second step is that: starting the powder feeder 16, enabling the first storage box 1601 and the second storage box 1602 on the powder feeder 16 to respectively contain two kinds of spraying materials, enabling the spraying materials to enter the coating inlet 5 through the first conveying pipe and the second conveying pipe, adjusting the feed hole to be opposite to a required spraying material connecting port by rotating the adjusting valve 6, enabling the spraying materials to enter the hollow pipe 604 through the feed hole, then reaching the spray head 3 through the coating inlet 5 for heat treatment, and finally enabling the treated spraying materials to pass through the atomizing cap 2 and then be sprayed out through the nozzle 4;

the third step: in the spraying process, the first connecting rod 1101 on the spray width adjusting knob 11 moves inwards by rotating the spray width adjusting knob 11, so that the first fastening block 1104 at the front end is attached to the atomizing hole 202 on the atomizing cap 2, and the spraying range of the spraying material is adjusted under the matching action of the trigger 10 and the spring; by rotating the spraying flow adjusting knob 12, the second connecting rod 1201 on the spraying flow adjusting knob 12 moves inward, so that the second packing block 1202 at the front end blocks the paint inlet, and the function of controlling the spraying amount of the spraying material is realized.

The working principle of the invention is as follows: after the device is electrified, the spray head 3 starts to perform heating work, then the air valve 22 is opened, the inert gas in the gas tank 17 enters the gas channel 20 through the gas tank 17, the third connecting rod 1401 can stretch and retract in the gas channel 20 by rotating the gas adjusting knob 14, and the inert gas can be blocked in the gas channel 20 to a certain extent by the action of the third connecting rod 1401 in the gas channel 20, so that the flow of the inert gas in the gas channel 20 is limited, and the function of controlling the gas flow is further performed; the powder feeder 16 is provided with a first storage box 1601 and a second storage box 1602, the first storage box 1601 and the second storage box 1602 can store two different painting materials simultaneously, the first storage box 1601 and the second storage box 1602 are respectively connected with a first paint delivery pipe 18 and a second paint delivery pipe 19, so as to be respectively connected with a first connector 7 and a second connector 8, under the action of the powder feeder 16, the painting materials in the first storage box 1601 and the second storage box 1602 can be delivered to a paint inlet 5 through the first paint delivery pipe 18 and the second paint delivery pipe 19, one end of the paint inlet 5 is provided with a regulating valve 6, a knob of the regulating valve 6 is connected with a hollow pipe 604, two feed holes 603 are oppositely arranged on two sides of the regulating valve 604, the two feed holes 603 are respectively opposite to the first connector 7 and the second connector 8, and by rotating the regulating valve 6, the orientation of the two feeding holes 603 on the hollow tube 604 can be changed, the first connector 7 or the second connector 8 of the feeding holes 603 are opposite, so that the spraying material can enter the hollow tube 604 through the first connector 7 or the second connector 8, and because the two feeding holes 603 are opposite, only one spraying material can enter the hollow tube 604, after the spraying material enters the hollow tube 604, the spraying material enters the paint inlet 5 from one end of the hollow tube 604 far away from the knob, the spraying material reaches the spray head 3 through the paint inlet 5, after the spraying material is subjected to the heating treatment of the plasma at the spray head 3, the spraying material subjected to the heat treatment is atomized under the action of the atomizing cap 2, and finally sprayed out from the nozzle 4, the surface of the atomizing cap 2 is provided with a plurality of atomizing holes 202, the distribution of the atomization holes 202 ensures that the spraying width of the spraying material is larger after the spraying material passes through the atomization cap 2, and the spraying effect is more uniform; a spray amplitude adjusting knob 11 and a spray flow adjusting knob 12 are arranged on one side of the gun body 1, a first connecting rod 1101 is connected to the spray amplitude adjusting knob 11, one end of the first connecting rod 1101 is connected with a first packing block 1104, and the first packing block 1104 can be used for realizing the sealing function on the atomizing hole 202 on the atomizing cap 2 by rotating the spray amplitude adjusting knob 11, so that the spray amplitude is limited when the spray material is sprayed out, the spray amplitude of the spray material is controlled, and the required spray effect is adjusted; the spraying flow adjusting knob 12 is connected with a second connecting rod 1201, the second connecting rod 1201 penetrates through a mounting hole 1002 in the trigger 10, a second packing block 1202 is installed at one end of the second connecting rod 1201, the second packing block 1202 is located at the position of the paint inlet 5, and the flow of the spraying material at the position of the paint inlet 5 is limited by the second packing block 1202 when entering the spray head 3 by adjusting the spraying flow adjusting knob 12, so that the spraying flow is controlled.

The foregoing is illustrative and explanatory of the structure of the invention, and various modifications, additions or substitutions in a similar manner to the specific embodiments described may be made by those skilled in the art without departing from the structure or scope of the invention as defined in the claims. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific circumstances, and in the present invention, unless otherwise specifically stated or defined, a first feature "on" or "under" a second feature may be directly contacting the first and second features, or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Claims

1. A plasma spraying device comprises a plasma spray gun, a gas tank (17) and a powder feeder (16), and is characterized in that the plasma spray gun comprises a gun body (1), one end of the gun body (1) is connected with one end of an atomizing cap (2), the other end of the atomizing cap (2) is provided with a spray head (3), and the spray head (3) is provided with a spray nozzle (4); a coating inlet (5) is arranged between the gun body (1) and the atomizing cap (2), and an adjusting valve (6) is arranged on the coating inlet (5); the utility model discloses a spray gun, including rifle body (1), shower nozzle (3), spray amplitude adjust knob (11), spray flow adjust knob (12) are provided with to the one end that keeps away from shower nozzle (3) of rifle body (1) is connected with handle (9), movable mounting has trigger (10) on handle (9), and one side of handle (9) is provided with spray amplitude adjust knob (11), spray amplitude adjust knob (11) below is provided with spraying flow adjust knob (12), terminal surface installs gas inlet (13) under handle (9), gas inlet (13) one side is provided with gas adjust knob (14), be connected with gas pitcher (17) on gas inlet (13), be connected with on coating.

2. The plasma spraying device according to claim 1, wherein the outer surface of one end of the atomizing cap (2) is provided with threads, one end of the gun body (1) is provided with a threaded mounting hole (1002), the atomizing cap (2) is screwed on the threaded mounting hole (1002), positioning clamp columns (201) are symmetrically arranged on two sides of the atomizing cap (2), the paint spray holes (203) are arranged between the positioning clamp columns (201), and a plurality of atomizing holes (202) are symmetrically arranged on two sides of the paint spray holes (203).

3. The plasma spraying device according to claim 1, wherein a first connector (7) and a second connector (8) are arranged on the surface of the coating inlet (5), the first connector (7) and the second connector (8) are both arranged on the lower side of the coating inlet (5), an adjusting valve (6) is installed at a port on one side of the coating inlet (5), the coating spraying device comprises a knob (601), a hollow tube (604) is arranged on the knob (601), feed holes (603) are respectively formed in the upper end face and the lower end face of the hollow tube (604), a sealing ring (602) is sleeved on the hollow tube (604), and the sealing ring (602) is attached to the surface on one side of the knob (601).

4. The plasma spraying device according to claim 1, characterized in that the handle (9) is divided into a first part and a second part, a positioning block (15) is arranged between the first part and the second part, the height of the positioning block (15) is smaller than the height of the lower end face of the trigger (10), and the surface of the handle (9) is coated with insulating paint.

5. The plasma spraying device according to claim 1, wherein a rotating shaft (21) is arranged at one end of the handle (9) close to the gun body (1), the rotating shaft (21) penetrates through the handle (9) and is movably mounted on the handle (9), mounting blocks (1001) are symmetrically arranged on two sides of the upper end of the trigger (10), mounting holes (1002) are formed in the two mounting blocks (1001), the trigger (10) is sleeved on the rotating shaft (21) through the mounting holes (1002), and penetrating hole sites (1003) are formed in the surface of the trigger (10).

6. The plasma spraying device according to claim 1, wherein a first connecting rod (1101) is arranged on one side surface of the spray width adjusting knob (11), a thread is arranged on one end surface, close to the spray width adjusting knob (11), of the first connecting rod (1101), a spring (1102) is sleeved on the first connecting rod (1101), a first tightening block (1104) is installed at one end of the first connecting rod (1101), a spring fixing ring (1103) is installed between the first tightening block (1104) and the spring (1102), one end of the spring (1102) is connected with the first connecting rod (1101), the other end of the spring (1102) is connected with the spring fixing ring (1103), and the first tightening block (1104) is attached to the inner side of the atomizing cap (2).

7. A plasma spraying device as claimed in claim 1, wherein a second connecting rod (1201) is provided on one side surface of the spray flow control knob (12), a thread is provided on one end surface of the second connecting rod (1201) near the spray flow control knob (12), the second connecting rod (1201) extends into the gun body (1) through the through hole (1003) and is connected with a second packing block (1202), and the second packing block (1202) is located above the paint inlet (5).

8. A plasma-spraying device as claimed in claim 1, characterized in that the powder feeder (16) comprises a first magazine (1601) and a second magazine (1602), the first magazine (1601) being connected to the first connection (7) via a first paint delivery tube (18), and the second magazine (1602) being connected to the second connection (8) via a second paint delivery tube (19).

9. The plasma spraying device according to claim 1, wherein the gas inlet (13) is communicated with a gas channel (20), a threaded hole is formed in the surface of the gas channel (20), a third connecting rod (1401) is arranged on the gas adjusting knob (14), the third connecting rod (1401) penetrates through the lower end of the handle (9) and is installed on the threaded hole, and the gas inlet (13) is connected with the gas tank (17) through a gas pipe; an air valve (22) is installed on the position, close to the trigger (10), of the air passage (20), and one end of the air valve (22) is installed on the air passage (20) in an embedded mode.

10. A method of using a plasma spray device, the method comprising the steps of:

the first step is as follows: electrifying the device, enabling the gas to enter the gas channel (20) through the gas pipe by adjusting the air valve (22), and adjusting the gas flow by adjusting the gas adjusting knob (14);

the second step is that: the powder feeder (16) is started, two kinds of spraying materials are respectively arranged in a first storage box (1601) and a second storage box (1602) on the powder feeder (16), the spraying materials enter a coating inlet (5) through a first conveying pipe and a second conveying pipe, a regulating valve (6) is rotated, so that a regulating feed hole (603) is opposite to a required spraying material connecting port, the spraying materials enter a hollow pipe (604) through the feed hole (603), then reach a spray head (3) through the coating inlet (5) for heat treatment, and finally the treated spraying materials are sprayed out through a spray nozzle (4) after passing through an atomizing cap (2);

the third step: in the spraying process, a first connecting rod (1101) on the spray width adjusting knob (11) moves inwards by rotating the spray width adjusting knob (11), so that a first pressing block (1104) at the front end is attached to an atomizing hole (202) on an atomizing cap (2), and the spraying range of the spraying material is adjusted; through rotating the spraying flow adjusting knob (12), a second connecting rod (1201) on the spraying flow adjusting knob (12) moves inwards, so that the second packing block (1202) at the front end blocks the paint inlet, and the spraying amount of the spraying material is influenced.