Gas mixing spray gun

Abstract

The utility model relates to a gas mixing spray gun and belongs to the technical field of spray guns. The spray gun comprises a gun body and a gun cap, the foremost end of the gun body is provided with a material spraying hole and an air outlet hole, the gun cap is provided with a through hole and an air spraying hole, an air cavity is formed between the air outlet hole and the air spraying hole, and air enters the air cavity through the air outlet hole after entering the gun body and then is sprayed out through the air spraying hole, so that the air sprayed out of the spray gun stably keeps high pressure. And the materials are uniformly atomized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of spray gun, concretely relates to a mixed gas spray gun. BACKGROUND

[0002] The mixed gas spray gun is a kind of spray equipment driven by compressed air or electric power, mainly used to pressurize paint and spray through nozzle, form extremely fine mist paint liquid, and rapidly spray to the surface of coated object to form paint film.However, the existing mixed gas spray gun has the problems of small air pressure and unstable air pressure. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art is solved.For this purpose, the utility model provides a mixed gas spray gun.

[0004] The purpose of the utility model can be realized by the following technical schemes:

[0005] A kind of mixed gas spray gun, comprising

[0006] Gun body, the front end of the gun body is left with spray hole and gas outlet hole;

[0007] Gun cap, the front end of the gun body is connected, the gas cavity is left between the gun cap and gun body, the gun cap is left with gas injection hole and through hole, one end of the gas injection hole is communicated with the gas cavity, the other end of the gas injection hole is communicated with the outside world;

[0008] The material that the gun body is sprayed through the spray hole is sprayed to the outside world, and the gas that the gun body is sprayed through the gas outlet hole is sprayed to the outside world from the gas injection hole after passing through the gas cavity.

[0009] According to some embodiments of the utility model, the gun body includes air inlet assembly, feed assembly and control assembly;The control assembly can reciprocate between an open position and a closed position;

[0010] The air inlet assembly includes air inlet and air inlet channel, the air inlet and the gas outlet hole are connected with two ends of the air inlet channel respectively and communicated through the air inlet channel when the control assembly leaves the closed position;

[0011] The feed assembly includes feed inlet and feed channel, the feed inlet and the spray hole are connected with two ends of the feed channel respectively and communicated through the feed channel when the control assembly leaves the closed position;

[0012] When the control assembly is located in the closed position, one end of the control assembly is in the air inlet channel and makes the air inlet and the gas outlet hole isolated from each other, and the other end of the control assembly is in the feed channel and makes the feed inlet and the spray hole isolated from each other.

[0013] According to some embodiments of the present application, at least a part of the feeding channel is arranged in front of the air inlet channel, the control assembly is arranged between the feeding channel and the air inlet channel, the displacement of the control assembly from the closed position to the open position is the displacement of the control assembly from the closed position backward, and a limiting assembly is further arranged behind the air inlet channel, which is used for limiting the amplitude of the displacement of the control assembly from the closed position backward.

[0014] According to some embodiments of the present application, the air inlet channel comprises a first air inlet channel and a second air inlet channel, one end of the first air inlet channel is connected with the air inlet, the other end of the first air inlet channel is connected with one end of the second air inlet channel, and the other end of the second air inlet channel is connected with the air outlet hole.

[0015] The feeding channel comprises a first feeding channel and a second feeding channel, one end of the first feeding channel is connected with the feeding inlet, the other end of the first feeding channel is connected with one end of the second feeding channel, and the other end of the second feeding channel is connected with the material ejection hole.

[0016] When the control assembly is in the closed position, the control assembly abuts at the connection of the first air inlet channel and the second air inlet channel and the connection of the first feeding channel and the second feeding channel, respectively.

[0017] According to some embodiments of the present application, the control assembly comprises a handle, a thimble and an air plug, the handle is connected with one end of the thimble and one end of the air plug, respectively, when the control assembly is in the closed position, the other end of the thimble is located between the first feeding channel and the second feeding channel and separates the first feeding channel and the second feeding channel from each other, and the other end of the air plug is located between the first air inlet channel and the second air inlet channel and separates the first air inlet channel and the second air inlet channel from each other.

[0018] According to some embodiments of the present application, the other end of the thimble is fixedly connected with a thimble bead, the thimble bead is made of tungsten, and a filter screen is further arranged between the feeding inlet and the feeding channel.

[0019] According to some embodiments of the present application, the air ejection hole comprises a first air ejection hole and a second air ejection hole, the first air ejection hole is arranged on the upper and lower sides of the through hole and ejects air toward the direction of the material ejected through the through hole, and the second air ejection hole is arranged on the left and right sides of the through hole and ejects air toward the direction of the material ejected through the through hole.

[0020] According to some embodiments of the utility model, the air cavity includes first air cavity and second air cavity, first air cavity set in the material spraying hole upper and lower four around, second air cavity set in first air cavity upper and lower four around, one end of first air cavity and one end of second air cavity are connected with the air inlet channel, first air jet and the other end of first air cavity are communicated, second air jet and the other end of second air cavity are communicated.

[0021] According to some embodiments of the utility model, the air outlet hole includes first air outlet hole and second air outlet hole, both ends of first air outlet hole are connected between first air cavity and air inlet channel, both ends of second air outlet hole are connected between second air cavity and air inlet channel.

[0022] According to some embodiments of the utility model, still include adjusting assembly, adjusting assembly can be displaced forward and backward, when adjusting assembly adjusts to the most front, one end of adjusting assembly and first air outlet hole abut and make first air outlet hole and air inlet channel are mutually isolated, when adjusting assembly leaves the most front and displaces backward, first air outlet hole and air inlet channel are mutually connected.

[0023] The utility model embodiment has at least the following technical effects:

[0024] 1. The gun body and the gun cap are provided with air cavity, and the gas is sprayed out through the air jet after entering the air cavity, so that the gas sprayed out of the spray gun is stable and maintains high pressure, and the material is uniformly atomized.

[0025] 2. The top bead is made of tungsten material, which can improve the corrosion resistance and durability of the top bead. DRAWINGS

[0026] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the drawings.

[0027] Fig. 1 The appearance drawing provided in an embodiment of the utility model;

[0028] Fig. 2 The cross-sectional view provided in an embodiment of the utility model;

[0029] Fig. 3 The exploded view provided in an embodiment of the utility model;

[0030] Fig. 4 The partial structure drawing provided in an embodiment of the utility model;

[0031] Fig. 5 The partial structure drawing provided in an embodiment of the utility model;

[0032] Fig. 6 The structural schematic diagram provided in an embodiment of the utility model.

[0033] The figure mark: 100, the gun body; 111, the first air hole; 112, the second air hole; 120, the material hole; 131, the first air cavity; 132, the second air cavity; 133, the ring; 200, the gun cap; 210, the through hole; 221, the first air jet; 222, the second air jet; 300, the air inlet assembly; 310, the air inlet; 321, the first air passage; 322, the second air passage; 400, the material inlet assembly; 410, the material inlet; 421, the first material passage; 422, the second material passage; 430, the filter screen; 500, the control assembly; 510, the handle; 520, the thimble; 521, the top pearl; 530, the air plug; 600, the adjusting assembly; 700, the limiting assembly. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0035] Please refer to Figs. 1-2 The utility model provides a kind of gas mixing spray gun in an embodiment, comprising

[0036] Gun body 100, the front end of gun body 100 is left with material hole 120 and air hole;

[0037] Gun cap 200 is connected to the front end of gun body 100, and air cavity is left between gun cap 200 and gun body 100, and gun cap 200 is left with air jet and through hole 210 on it, one end of air jet is communicated with air cavity, and the other end of air jet is communicated with outside;

[0038] Material that gun body 100 sprays out through material hole 120 passes through through hole 210 and sprays to outside, and gas that gun body 100 sprays out through air hole is sprayed to outside from air jet after passing through air cavity.

[0039] In the embodiment, the mixed gas spray gun comprises a gun body 100 and a gun cap 200. The front end of the gun body 100 is provided with a material spraying hole 120 and an air outlet hole. The gun cap 200 is threadedly connected to the front end of the gun body 100, and an annular air cavity is formed between the gun body 100 and the gun cap 200. Two groups of air injection holes and a central through hole 210 are formed in the gun cap 200. One end of the air injection hole is communicated with the air cavity, and the other end is inclined to the direction of the through hole 210. The through hole 210 is coaxially aligned with the material spraying hole 120 of the gun body 100. An air cavity is arranged between the gun body 100 and the gun cap 200, and the air cavity is arranged between the air outlet hole and the air injection hole. After the gas enters the gun body 100, the gas first enters the air cavity through the air outlet hole and then is sprayed out of the spray gun through the air injection hole. The air cavity can buffer the gas. The gas first passes through the air cavity and then is sprayed out of the air injection hole, so that the gas sprayed out of the spray gun is stable and maintains a high pressure, and the material is uniformly atomized.

[0040] In a further embodiment of the utility model, the gun body 100 comprises an air inlet assembly 300, a material inlet assembly 400 and a control assembly 500. The control assembly 500 can move back and forth between an open position and a closed position.

[0041] The air inlet assembly 300 comprises an air inlet 310 and an air inlet channel. The air inlet 310 and the air outlet hole are respectively connected to two ends of the air inlet channel and are communicated through the air inlet channel when the control assembly 500 is away from the closed position.

[0042] The material inlet assembly 400 comprises a material inlet 410 and a material inlet channel. The material inlet 410 and the material spraying hole 120 are respectively connected to two ends of the material inlet channel and are communicated through the material inlet channel when the control assembly 500 is away from the closed position.

[0043] When the control assembly 500 is in the closed position, one end of the control assembly 500 is in the air inlet channel and separates the air inlet 310 and the air outlet hole from each other. The other end of the control assembly 500 is in the material inlet channel and separates the material inlet 410 and the material spraying hole 120 from each other.

[0044] In the embodiment, the control assembly 500 controls the flow of material and air at the same time. When the control assembly 500 is in the closed position, the two ends of the control assembly 500 are respectively inserted into the necked sections of the material inlet channel and the air inlet channel, and the flow of material in the material inlet channel and the flow of air in the air inlet channel are blocked. When the control assembly 500 is away from the closed position, the material inlet channel and the air inlet channel are opened, and the spray gun normally sprays air and material.

[0045] In a further embodiment of the utility model, a reset assembly is arranged. When the control assembly 500 is away from the closed position, the reset assembly provides a force to the control assembly 500 to make the control assembly 500 move towards the closed position. Without external force, the control assembly 500 is kept in the closed position.

[0046] In some embodiments, the reset component can be a spring, one end of the spring is arranged at the rear of the handle 510 and connected with the handle 510, and the other end of the spring is arranged at the part of the gun body 100 located at the rear of the handle 510, when the user pulls the handle 510 to displace rearward, the handle 510 drives the control component 500 to displace from the closed position to the open position, when the user stops pulling the handle 510, the handle 510 displaces forward under the action of the spring and drives the control component 500 to displace to the closed position.

[0047] Of course, the reset component can also be arranged in other ways.

[0048] In further embodiments of the utility model, when the control component 500 just leaves the closed position to displace to the open position, the air inlet channel is first opened, so that the gas in the air inlet channel flows normally and is sprayed out through the air injection hole, when the control component 500 leaves the closed position to displace a distance to the open position and the gas has been sprayed out through the air injection hole, the material inlet channel is then opened, so that the material flows in the material inlet channel and is sprayed out through the material injection hole 120.

[0049] In this embodiment, when the user controls the spray gun to work through the control component 500, the spray gun first sprays the gas and then sprays the material, which avoids the situation that the gas pressure is insufficient or unstable when the gas and the material are sprayed at the same time, so that the first sprayed part of the material cannot be fully atomized, further leading to poor material spraying effect or waste of material.

[0050] In further embodiments of the utility model, a rebound device is further arranged, the rebound device is used for controlling the control component 500 to rebound to the closed position under the condition that no external force acts.

[0051] In further embodiments of the utility model, the material inlet channel is arranged in front of the air inlet channel, the control component 500 is arranged between the material inlet channel and the air inlet channel, the displacement of the control component 500 from the closed position to the open position is the displacement of the control component 500 from the closed position rearward, and a limiting component 700 is further arranged at the rear of the air inlet channel, the limiting component 700 is used for limiting the amplitude of the displacement of the control component 500 from the closed position rearward.

[0052] In this embodiment, the rear of the control component 500 is provided with the limiting component 700 which can displace forward and rearward, when the limiting component 700 is at the most rear position, the control component 500 can normally displace between the open position and the closed position, that is, the control component 500 controls the material inlet channel and the air inlet channel to open to the maximum position, when the limiting component 700 is adjusted to the front position, the displacement of the control component 500 to the open position can be limited or even the control component 500 cannot displace to the open position from the closed position, so as to limit the maximum opening degree of the material inlet channel and the air inlet channel.

[0053] The limiting assembly 700 is rotatably connected with the gun body 100, one end of the limiting assembly 700 is arranged outside the gun body 100 for a user to rotate and adjust the limiting assembly 700, the other end of the limiting assembly 700 is arranged inside the gun body 100 for limiting the control assembly 500, the user rotates and adjusts the limiting assembly 700 to make the limiting assembly 700 displace forward and backward between a most forward position and a last position, when the limiting assembly 700 displaces forward to the most forward position, the other end of the limiting assembly 700 abuts against the last end of the control assembly 500, so that the control assembly 500 is kept in the closed position and cannot displace toward the open position, when the limiting assembly 700 displaces backward from the most forward position, a gap is left between the other end of the limiting assembly 700 and the last end of the control assembly 500, so that the control assembly 500 can displace from the closed position toward the open position until the last end of the control assembly 500 abuts against the other end of the limiting assembly 700 again.

[0054] In further embodiments of the present application, the air inlet channel comprises a first air inlet channel 321 and a second air inlet channel 322, one end of the first air inlet channel 321 is connected with the air inlet 310, the other end of the first air inlet channel 321 is connected with one end of the second air inlet channel 322, the other end of the second air inlet channel 322 is connected with the air outlet hole;

[0055] The feeding channel comprises a first feeding channel 421 and a second feeding channel 422, one end of the first feeding channel 421 is connected with the feeding inlet 410, the other end of the first feeding channel 421 is connected with one end of the second feeding channel 422, the other end of the second feeding channel 422 is connected with the material spraying hole 120.

[0056] When the control assembly 500 is in the closed position, the control assembly 500 abuts against the connection position of the first air inlet channel 321 and the second air inlet channel 322 and the connection position of the first feeding channel 421 and the second feeding channel 422 respectively.

[0057] The control assembly 500 comprises a handle 510, a thimble 520 and an air plug 530, one end of the handle 510 is connected with one end of the thimble 520 and one end of the air plug 530 respectively, when the control assembly 500 is in the closed position, the other end of the thimble 520 is located between the first feeding channel 421 and the second feeding channel 422 and separates the first feeding channel 421 and the second feeding channel 422 from each other, the other end of the air plug 530 is located between the first air inlet channel 321 and the second air inlet channel 322 and separates the first air inlet channel 321 and the second air inlet channel 322 from each other.

[0058] In further embodiments of the present application, the other end of the thimble 520 is fixedly connected with a thimble bead 521, the thimble bead 521 is made of tungsten.

[0059] In the embodiment, the metal tungsten has high hardness, corrosion resistance and other characteristics, the top bead 521 is a component for blocking the flow of high-pressure material, and is made of metal tungsten, so that the corrosion resistance and durability of the top bead 521 can be improved.

[0060] In further embodiments of the utility model, the air injection hole includes a first air injection hole 221 and a second air injection hole 222, the first air injection hole 221 is arranged on the upper and lower sides of the through hole 210 and sprays air towards the direction of the material sprayed through the through hole 210, and the second air injection hole 222 is arranged on the left and right sides of the through hole 210 and sprays air towards the direction of the material sprayed through the through hole 210.

[0061] Please refer to Figs. 3-5 In the embodiment, the second air injection hole 222 sprays air towards the direction of the through hole 210, so that the material sprayed through the through hole 210 is fully atomized, the first air injection hole 221 sprays air towards the direction of the through hole 210, limits the diffusion of the atomized material, and the material is sprayed on the specified position.

[0062] In further embodiments of the utility model, the air cavity includes a first air cavity 131 and a second air cavity 132, the first air cavity 131 and the second air cavity 132 are connected with the air inlet channel, the first air injection hole 221 is in communication with the first air cavity 131, and the second air injection hole 222 is in communication with the second air cavity 132. The first air cavity 131 and the second air cavity 132 are further provided with a partition ring 133 for dividing the first air cavity 131 and the second air cavity 132, the first air cavity 131 is arranged around the material injection hole 120 in the up, down, left and right directions, and the second air cavity 132 is arranged around the first air cavity 131 in the up, down, left and right directions.

[0063] In further embodiments of the utility model, the air outlet hole includes a first air outlet hole 111 and a second air outlet hole 112, two ends of the first air outlet hole 111 are connected between the first air cavity 131 and the air inlet channel, and two ends of the second air outlet hole 112 are connected between the second air cavity 132 and the air inlet channel.

[0064] In the embodiment, after the gas flows through the air inlet channel, the gas flows to the first air outlet hole 111 and the second air outlet hole 112 respectively, the gas flowing to the first air outlet hole 111 is sprayed through the first air injection hole 221 after passing through the first air cavity 131, and the gas flowing to the second air outlet hole 112 is sprayed through the second air injection hole 222 after passing through the second air cavity 132. The two air cavities are arranged, which is helpful to adjust the pressure of the first air injection hole 221 and the second air injection hole 222 respectively.

[0065] Please refer to Fig. 2 , Fig. 6In a further embodiment of the present invention, an adjustment component 600 is also included. The adjustment component 600 can be moved back and forth. When the adjustment component 600 is adjusted to the frontmost position, one end of the adjustment component 600 abuts against the first air outlet 111 and isolates the first air outlet 111 from the air intake channel. When the adjustment component 600 moves away from the frontmost position and moves backward, the first air outlet 111 and the air intake channel are connected to each other.

[0066] In this embodiment, the adjustment component 600 is rotatably connected to the gun body 100. Rotating the adjustment component 600 can control the adjustment component 600 to move back and forth. One end of the adjustment component 600 is located outside the gun body 100 for the user to rotate. The other end of the adjustment component 600 is located inside the gun body 100. The first air outlet 111 is located directly in front of the other end of the adjustment component 600, and the second air outlet 112 is located to the side front of the other end of the adjustment component 600. The amount of gas flowing from the air intake channel to the first air outlet 111 is controlled by the position of the adjustment component 600, while the amount of gas flowing from the air intake channel to the second air outlet 112 is not controlled by the position of the adjustment component 600. When the adjusting component 600 moves backward, the gap between the other end of the adjusting component 600 and the first air outlet 111 increases, the amount of gas flowing into the first air outlet 111 from the air inlet channel increases, the air pressure in the first air chamber 131 increases, the pressure of the gas ejected from the first jet hole 221 increases, and the atomized material is more restricted and shrinks into a circular spray. When the adjusting component 600 moves forward, the gap between the other end of the adjusting component 600 and the first air outlet 111 decreases, the amount of gas flowing into the first air outlet 111 from the air inlet channel decreases, the air pressure in the first air chamber 131 decreases, the pressure of the gas ejected from the first jet hole 221 decreases, the atomized material is less restricted, and the material disperses into a thin, elongated spray.

[0067] In a further embodiment of this utility model, a filter screen 430 is also provided between the feed inlet 410 and the feed channel.

[0068] In this embodiment, the filter 430 is cylindrical; please refer to the following for details. Fig. 2 The material enters the filter screen 430 through the feed inlet 410 at the bottom of the filter screen 430, and after being filtered by the filter screen 430, it enters the filter screen 430 and then flows upward to the spray hole 120.

[0069] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A gas mixing lance, characterized in that Comprising a barrel (100), a front end of the barrel (100) is left with a material ejection hole (120) and a gas outlet hole; a barrel cap (200) is connected to the front end of the barrel (100), a gas cavity is left between the barrel cap (200) and the barrel (100), the barrel cap (200) is left with a gas ejection hole and a through hole (210), one end of the gas ejection hole is communicated with the gas cavity, and the other end of the gas ejection hole is communicated with the outside; The material ejected by the barrel (100) through the material ejection hole (120) is ejected to the outside through the through hole (210), and the gas ejected by the barrel (100) through the gas outlet hole is ejected to the outside from the gas ejection hole after passing through the gas cavity.

2. A gas mixing lance according to claim 1, characterized in that The barrel (100) comprises an air inlet assembly (300), a material inlet assembly (400) and a control assembly (500); the control assembly (500) can move back and forth between an open position and a closed position; The air inlet assembly (300) comprises an air inlet (310) and an air inlet channel, the air inlet (310) and the gas outlet hole are respectively connected to two ends of the air inlet channel and communicated through the air inlet channel when the control assembly (500) is away from the closed position; The material inlet assembly (400) comprises a material inlet (410) and a material inlet channel, the material inlet (410) and the material ejection hole (120) are respectively connected to two ends of the material inlet channel and communicated through the material inlet channel when the control assembly (500) is away from the closed position; When the control assembly (500) is in the closed position, one end of the control assembly (500) is in the air inlet channel and separates the air inlet (310) and the gas outlet hole from each other, and the other end of the control assembly (500) is in the material inlet channel and separates the material inlet (410) and the material ejection hole (120) from each other.

3. A gas mixing lance according to claim 2, characterized in that At least a part of the material inlet channel is arranged in front of the air inlet channel, the control assembly (500) is arranged between the material inlet channel and the air inlet channel, the displacement of the control assembly (500) from the closed position to the open position is the displacement of the control assembly (500) from the closed position backward, and a limiting assembly (700) is further arranged behind the air inlet channel, the limiting assembly (700) is used for limiting the amplitude of the displacement of the control assembly (500) from the closed position backward.

4. A gas mixing lance according to claim 2, characterized in that The air inlet channel comprises a first air inlet channel (321) and a second air inlet channel (322), one end of the first air inlet channel (321) is connected to the air inlet (310), the other end of the first air inlet channel (321) is connected to one end of the second air inlet channel (322), and the other end of the second air inlet channel (322) is connected to the gas outlet hole; The feeding channel comprises a first feeding channel (421) and a second feeding channel (422), one end of the first feeding channel (421) is connected with the feeding port (410), the other end of the first feeding channel (421) is connected with one end of the second feeding channel (422), and the other end of the second feeding channel (422) is connected with the feeding hole (120); When the control assembly (500) is in the closed position, the control assembly (500) abuts at the connection of the first air inlet channel (321) and the second air inlet channel (322) and the connection of the first feeding channel (421) and the second feeding channel (422) respectively.

5. A gas mixing lance according to claim 4, characterized in that The control assembly (500) comprises a handle (510), a thimble (520) and an air plug (530), one end of the handle (510) is connected with one end of the thimble (520) and one end of the air plug (530) respectively; when the control assembly (500) is in the closed position, the other end of the thimble (520) is located between the first feeding channel (421) and the second feeding channel (422) and separates the first feeding channel (421) and the second feeding channel (422) from each other, and the other end of the air plug (530) is located between the first air inlet channel (321) and the second air inlet channel (322) and separates the first air inlet channel (321) and the second air inlet channel (322) from each other.

6. A gas mixing lance according to claim 5, characterized in that The other end of the thimble (520) is fixedly connected with a thimble bead (521), the thimble bead (521) is made of tungsten, and a filter screen (430) is further arranged between the feeding port (410) and the feeding channel.

7. A gas mixing lance according to claim 2, characterized in that The air injection hole comprises a first air injection hole (221) and a second air injection hole (222), the first air injection hole (221) is arranged on the upper and lower sides of the through hole (210) and sprays air towards the material sprayed through the through hole (210), and the second air injection hole (222) is arranged on the left and right sides of the through hole (210) and sprays air towards the material sprayed through the through hole (210).

8. A gas mixing lance according to claim 7, characterized in that The air cavity comprises a first air cavity (131) and a second air cavity (132), the first air cavity (131) is arranged around the feeding hole (120) on the upper, lower, left and right sides, the second air cavity (132) is arranged around the first air cavity (131) on the upper, lower, left and right sides, one end of the first air cavity (131) and one end of the second air cavity (132) are connected with the air inlet channel, the other end of the first air injection hole (221) is in communication with the first air cavity (131), and the other end of the second air injection hole (222) is connected with the second air cavity (132).

9. A gas mixing lance according to claim 8, characterized in that The air outlet hole comprises a first air outlet hole (111) and a second air outlet hole (112), both ends of the first air outlet hole (111) are connected between the first air cavity (131) and the air inlet channel, and both ends of the second air outlet hole (112) are connected between the second air cavity (132) and the air inlet channel.

10. A gas mixing lance according to claim 9, characterized in that Further comprising an adjusting assembly (600) which is displaceable forward and backward, when the adjusting assembly (600) is adjusted to the most forward position, one end of the adjusting assembly (600) abuts against the first air outlet hole (111) and isolates the first air outlet hole (111) from the air inlet channel, when the adjusting assembly (600) is displaced backward from the most forward position, the first air outlet hole (111) is communicated with the air inlet channel.

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