A self-cleaning nozzle, spraying device and control system

Abstract

This invention relates to a self-cleaning nozzle, spraying device, and control system, comprising a housing, a mixing chamber within the housing, a first chamber and a second chamber on opposite sides of the mixing chamber, an outlet communicating with the mixing chamber on one side of the housing, and an air inlet communicating with the mixing chamber, a first liquid supply port communicating with the first chamber and a second liquid supply port communicating with the second chamber on the side of the housing away from the outlet; a mixing column is provided within the mixing chamber, and a first liquid outlet communicating with the first chamber and a second liquid outlet communicating with the second chamber are respectively opened on the inner wall of the mixing chamber, with the first and second liquid outlets respectively arranged opposite to the mixing column; the above design prevents nozzle clogging, avoids manual cleaning of the nozzle by workers before the next use of the spray gun, and the invention has a simple structure, low cost, and is easy to manufacture, effectively saving on-site preparation time and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of spray gun self-cleaning technology, and in particular to a self-cleaning nozzle, spraying device and control system. Background Technology

[0002] A spray gun is a device that uses the rapid release of liquid or compressed air as its power source. A spray gun contains a nozzle, which is manufactured in a flat shape. It is easy to replace, has a low cost, and can effectively prevent the nozzle from falling off and wearing out.

[0003] At airports, train stations, and ports, passengers often carry a lot of luggage. If packaging is damaged during transport, leading to contaminant leakage, professionals cannot immediately reach the scene to analyze the contaminants. Currently, spray guns are often used to spray two-component emergency curing agents onto the contaminants. The spray gun requires the two types of polyurethane to be thoroughly mixed before spraying. After mixing, the polyurethane foams, expands, and cures in a very short time. When the spray gun stops spraying, a small amount of mixed polyurethane liquid remains in the spray gun nozzle. This residual mixed polyurethane liquid expands and cures rapidly, clogging the mixing chamber and nozzle of the spray gun. This causes the nozzle to become clogged and unable to spray the next time, rendering the equipment unusable. Manual cleaning is time-consuming, labor-intensive, and inefficient.

[0004] Therefore, in view of the above problems, the present invention urgently needs to provide a self-cleaning nozzle, a spraying device and a control system. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning nozzle, spraying device, and control system. The design of the spraying device and control system solves the problem that after the existing spray gun stops spraying, a small amount of mixed polyurethane liquid remains in the nozzle and blocks the mixing chamber.

[0006] A self-cleaning nozzle includes a housing, a mixing chamber inside the housing, a first chamber and a second chamber on both sides of the mixing chamber, an outlet communicating with the mixing chamber on one side of the housing, and an air inlet communicating with the mixing chamber, a first liquid supply port communicating with the first chamber and a second liquid supply port communicating with the second chamber on the side of the housing away from the outlet.

[0007] The mixing chamber is equipped with a mixing column. The inner wall of the mixing chamber is provided with a first liquid outlet communicating with the first chamber and a second liquid outlet communicating with the second chamber. The first liquid outlet and the second liquid outlet are respectively arranged opposite to the mixing column.

[0008] A one-way valve A is installed in the first chamber close to the first liquid outlet, a one-way valve B is installed in the second chamber close to the second liquid outlet, and a compressed air one-way valve is installed in the mixing chamber close to the air inlet.

[0009] Preferably, the ratio of the diameter of the mixing chamber closest to the first and second liquid outlets to the diameter of the mixing column is 8:5, the ratio of the diameter of the first liquid outlet to the diameter of the mixing column is 5:3, and the ratio of the diameter of the second liquid outlet to the diameter of the mixing column is 5:3. This is the most preferred scheme.

[0010] Preferably, the top of the housing is provided with a first groove, the center of the first groove is provided with a threaded through hole communicating with the mixing chamber, the inner wall of the mixing chamber is provided with an embedded hole corresponding to the upper and lower parts of the threaded through hole, the mixing column includes a screw rod that passes through the threaded through hole, one end of the screw rod is provided with a limiting plate embedded in the first groove, and the other end of the screw rod passes through the threaded through hole and is embedded in the embedded hole.

[0011] Preferably, machining holes are provided on both sides of the housing, and the machining holes are sealed with threaded plugs.

[0012] Preferably, the shell and the mixing column are made of aluminum alloy, and the outer surface of the shell and the mixing column is provided with an oxide layer.

[0013] Preferably, the housing has a mounting hole that extends longitudinally through the housing.

[0014] Preferably, the air inlet, the first liquid supply port, the second liquid supply port, the spray outlet, and the machining hole are all provided with internal threads.

[0015] Preferably, the diameter of the first chamber is smaller than the diameter of the first liquid supply port; the diameter of the second chamber is smaller than the diameter of the second liquid supply port; and the diameter of the mixing chamber is smaller than the diameters of the air inlet and the nozzle.

[0016] This invention provides a spraying device, including a self-cleaning nozzle, a first liquid supply port connected to a first liquid tank via a pipeline, and an electromagnetic valve A and a first liquid pump installed on the pipeline connecting the first liquid supply port and the first liquid tank; a second liquid supply port connected to a second liquid tank via a pipeline, and an electromagnetic valve B and a second liquid pump installed on the pipeline connecting the second liquid supply port and the second liquid tank; and an air inlet connected to an air source via a pipeline, and a compressed air electromagnetic valve and an air pump installed on the pipeline connecting the air inlet and the air source.

[0017] The present invention provides a control system for a spraying device, comprising:

[0018] Electronic switches are used to send digital signals to the control unit to open solenoid valves A, B, and the compressed air solenoid valve.

[0019] The control unit is used to receive the digital switching signal from the electronic switch, convert the digital switching signal into a switching signal, and send the switching signal to solenoid valve A, the first liquid pump, solenoid valve B, the second liquid pump, the compressed air solenoid valve, and the air pump to control solenoid valve A, the first liquid pump, solenoid valve B, the second liquid pump, the compressed air solenoid valve, and the air pump to open simultaneously.

[0020] It is also used to control the simultaneous closure of solenoid valve A, the first liquid pump, solenoid valve B, and the second liquid pump, and to close the compressed air solenoid valve and the air pump after a 5-second delay; it is also used to control the opening and closing of solenoid valve A, solenoid valve B, and the compressed air solenoid valve, to adjust the hydraulic pressure in the first chamber and the second chamber, and to adjust the air pressure in the mixing chamber.

[0021] Solenoid valve A is used to receive the switching signal from the control unit and control whether the first liquid tank delivers liquid to the first chamber.

[0022] The first liquid pump is used to receive the switching signal from the control unit and control whether the first liquid tank delivers liquid to the first chamber.

[0023] Solenoid valve B is used to receive the switching signal from the control unit and control whether the second liquid tank delivers liquid to the second chamber.

[0024] The second liquid pump is used to receive the switching signal from the control unit and control whether the second liquid tank delivers liquid to the second chamber.

[0025] The compressed air solenoid valve is used to receive the switching signal from the control unit and control whether the air source delivers compressed gas to the mixing chamber.

[0026] The air pump is used to receive the switching signals from the control unit and control whether the air source delivers compressed gas to the mixing chamber.

[0027] Preferably, the hydraulic pressure in the first chamber and the second chamber is equal to the air pressure in the mixing chamber, and the hydraulic pressure plus the air pressure is greater than or equal to 2 MPa.

[0028] The self-cleaning nozzle, spraying device, and control system provided by this invention have the following advantages compared with the prior art:

[0029] 1. The self-cleaning nozzle provided by the present invention is designed with a first liquid outlet and a second liquid outlet arranged opposite to each other, and a mixing column is designed between the first liquid outlet and the second liquid outlet. During spraying, the liquid in the first chamber and the second chamber impacts the mixing column from the first liquid outlet and the second liquid outlet respectively, so that the two liquids are fully mixed. The mixing column is detachably connected to the housing, which facilitates the cleaning of the nozzle interior in the later stages of use.

[0030] 2. The housing of the present invention has machining holes on both sides, and the machining holes are sealed with threaded plugs, which facilitates the cleaning of the first liquid outlet and the second liquid outlet in the later stage of use, and avoids liquid deposition in the first liquid outlet and the second liquid outlet, which affects the liquid spraying effect.

[0031] 3. In this invention, the compressed air solenoid valve closes 5 seconds later than solenoid valves A and B when spraying stops. The compressed gas is used to discharge all the remaining mixed liquid from the spray outlet immediately, preventing nozzle blockage and avoiding the need for manual cleaning of the nozzles before the next use of the spray gun. This invention has a simple structure, low cost, and is easy to manufacture, effectively saving on-site preparation time and improving work efficiency. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram (cross-sectional view) of the self-cleaning nozzle structure described in this invention;

[0034] Figure 2 This is a schematic diagram (cross-sectional view) of the self-cleaning nozzle structure described in this invention;

[0035] Figure 3 A schematic diagram (three-dimensional view) of the hybrid column structure described in this invention;

[0036] Figure 4 This is a schematic diagram (perspective view) of the self-cleaning nozzle structure described in this invention;

[0037] Figure 5 This is a schematic diagram of the spraying device described in this invention;

[0038] Figure 6 This is a control system diagram of the injection device described in this invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Housing; 11. First groove; 12. Threaded through hole; 13. Embedded hole; 14. Machining hole; 15. Mounting hole; 2. Mixing chamber; 3. First chamber; 4. Second chamber; 21. Spray outlet; 22. Air inlet; 221. Compressed air check valve; 31. First liquid supply port; 32. Check valve A; 41. Second liquid supply port; 42. Check valve B; 5. Mixing column; 51. Limiting plate; 6. First liquid tank; 61. Solenoid valve A; 62. First liquid pump; 7. Second liquid tank; 71. Solenoid valve B; 72. Second liquid pump; 8. Air source; 81. Compressed air solenoid valve; 82. Air pump. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Example 1

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a self-cleaning nozzle, including a housing 1. The housing 1 has a mixing chamber 2 inside, and a first chamber 3 and a second chamber 4 are respectively provided on both sides of the mixing chamber 2. One side of the housing 1 has a spray outlet 21 communicating with the mixing chamber 2, and the side of the housing 1 away from the spray outlet 21 has an air inlet 22 communicating with the mixing chamber 2, a first liquid supply port 31 communicating with the first chamber 3, and a second liquid supply port 41 communicating with the second chamber 4. The mixing chamber 2 has a mixing column 5 inside, and the inner wall of the mixing chamber 2 has a first liquid outlet communicating with the first chamber 3 and a second liquid outlet communicating with the second chamber 4. The first liquid outlet and the second liquid outlet are respectively arranged opposite to the mixing column 5. A one-way valve A32 is installed in the first chamber 3 close to the first liquid outlet, a one-way valve B42 is installed in the second chamber 4 close to the second liquid outlet, and a compressed air one-way valve 221 is installed in the mixing chamber 2 close to the air inlet 22.

[0046] Through the above-described structural design, this invention utilizes a mixing column 5 positioned between a first and second liquid outlet, ensuring thorough mixing of the liquids ejected from both outlets. This uniform mixing facilitates rapid solidification of the mixture. Liquids in the first chamber 3 and the second chamber 4 impact the mixing column 5 from the first and second outlets, further enhancing mixing. Simultaneously, high-pressure gas entering through the air inlet 22 propels the mixture at high speed. The mixing column 5 also narrows the gas flow path, altering the flow rate and turbulence during mixing, thus achieving complete mixing. Upon stopping spraying, compressed gas completely expels the remaining mixture from the nozzle 21, preventing nozzle clogging and eliminating the need for manual nozzle cleaning before the next use. Meanwhile, since the first and second liquid outlets are positioned opposite to the mixing column 5, excess liquid at the first and second liquid outlets can be carried out when high-pressure gas passes through, preventing residual curing agent from clogging the first and second liquid outlets. This invention has a simple structure, low cost, and is easy to manufacture, while also providing good spraying effect and improving work efficiency.

[0047] In this embodiment, the diameter ratio of the mixing chamber 2 adjacent to the first and second liquid outlets to the diameter of the mixing column 5 is (6-10):5, the diameter ratio of the first liquid outlet to the diameter of the mixing column 5 is (4-7):3, and the diameter ratio of the second liquid outlet to the diameter of the mixing column 5 is (4-7):3.

[0048] The design of the mixing chamber 2, which is close to the first liquid outlet and the second liquid outlet, with a diameter ratio of (6-10):5 to the diameter of the mixing column 5, can reduce the diameter of the mixing chamber 2, making the gas flow channel narrower. This forces compressed air to flow at high speed through the first liquid outlet and the second liquid outlet, which can carry out, blow away and empty the residual liquid.

[0049] The design of the diameter ratio of the first liquid outlet to the mixing column (5) of the present invention being (4-7):3, and the diameter ratio of the second liquid outlet to the mixing column (5) being (4-7):3, can affect the flow rate during liquid mixing and the flow effect around the liquid, further affecting the mixing effect of the two liquids.

[0050] In a specific implementation plan, during the specific preparation process, the diameter ratio of the mixing chamber 2 adjacent to the first and second liquid outlets to the diameter of the mixing column 5 is 8:5, the diameter ratio of the first liquid outlet to the diameter of the mixing column 5 is 5:3, and the diameter ratio of the second liquid outlet to the diameter of the mixing column 5 is 5:3.

[0051] Processing can be carried out according to the set proportions, which will not be elaborated here.

[0052] Through the above design, this invention enables two different liquids to be fully mixed, achieving rapid curing and allowing on-site spraying work to proceed smoothly.

[0053] like Figure 4 As shown, the top of the housing 1 in this embodiment is provided with a first groove 11, and the center of the first groove 11 is provided with a threaded through hole 12 communicating with the mixing chamber 2. The inner wall of the mixing chamber 2 is provided with an embedded hole 13 corresponding to the upper and lower parts of the threaded through hole 12. The mixing column 5 includes a screw that passes through the threaded through hole 12. One end of the screw is provided with a limiting plate 51 embedded in the first groove 11, and the other end of the screw passes through the threaded through hole 12 and is embedded in the embedded hole 13.

[0054] Through the design of the above structure, the present invention utilizes the threaded through hole 12 and the screw to achieve a detachable connection between the housing 1 and the mixing column 5, which facilitates later replacement and also makes it convenient to clean the inside of the mixing chamber 2 regularly, ensuring normal use in the future.

[0055] like Figure 1 As shown, machining holes 14 are provided on both sides of the housing 1, and the machining holes 14 are sealed with threaded plugs.

[0056] Through the above-mentioned structural design, the present invention facilitates the processing of the transverse chamber inside the nozzle, making the processing process simpler and more convenient. During the nozzle spraying and cleaning process, the processing hole 14 is sealed with a thread plug to ensure the overall sealing of the nozzle. Furthermore, during regular cleaning, it is convenient to clean the first and second liquid outlets, preventing the hardener from depositing in the first and second liquid outlets and affecting the liquid spraying effect.

[0057] The shell 1 and the mixing column 5 of the present invention are made of aluminum alloy, and the outer surface of the shell 1 and the mixing column 5 is provided with an oxide layer.

[0058] Through the above design, the aluminum material is low-cost, lightweight, and easy to carry, and the surface is protected by an oxide layer to extend the service life of the nozzle.

[0059] like Figure 2 As shown, the housing 1 of this embodiment is provided with four longitudinally penetrating mounting holes 15.

[0060] The present invention, through the above structural design, reserves a position for the installation of electronic switches, which facilitates the subsequent installation of electronic switches.

[0061] Specifically, the air inlet 22, the first liquid supply port 31, the second liquid supply port 41, the spray outlet 21, and the machining hole 14 are all provided with internal threads.

[0062] Through the above structural design, the present invention facilitates the connection of the air inlet 22 to the air source 8 via a pipeline, facilitates the connection of the first liquid supply port 31 to the first liquid tank 6, facilitates the connection of the second liquid supply port 41 to the second liquid tank 7, the threaded design further ensures the overall sealing performance, and facilitates the connection of the spray outlet 21 to the flat-head water nozzle. The flat-head water nozzle can help the nozzle spray out a fan-shaped mixture, increase the spray area, and improve work efficiency.

[0063] In this embodiment, the diameter of the first chamber 3 is smaller than the diameter of the first liquid supply port 31; the diameter of the second chamber 4 is smaller than the diameter of the second liquid supply port 41; and the diameter of the mixing chamber 2 is smaller than the diameter of the air inlet 22 and the nozzle 21.

[0064] Through the above structural design, the present invention enables the compressed gas to obtain greater pressure to smoothly eject the two liquids, and enables the two liquids to impact the mixing column 5 with greater pressure, so that the liquids are fully mixed.

[0065] like Figure 5 As shown, the present invention provides a spraying device, including a self-cleaning nozzle, a first liquid supply port 31 connected to a first liquid tank 6 via a pipeline, and a solenoid valve A61 and a first liquid pump 62 installed on the pipeline connecting the first liquid supply port 31 and the first liquid tank 6; a second liquid supply port 41 connected to a second liquid tank 7 via a pipeline, and a solenoid valve B71 and a second liquid pump 72 installed on the pipeline connecting the second liquid supply port 41 and the second liquid tank 7; and an air inlet 22 connected to an air source 8 via a pipeline, and a compressed air solenoid valve 81 and an air pump 82 installed on the pipeline connecting the air inlet 22 and the air source 8.

[0066] Through the above design, the present invention controls the electronic switch to send a signal to the solenoid valve, and uses solenoid valve A61, solenoid valve B71 and compressed air solenoid valve 81 to control whether the liquid in the liquid tank is sprayed outward, which intelligently and conveniently improves work efficiency.

[0067] like Figure 6 As shown, the present invention provides a control system for a jetting device, including...

[0068] An electronic switch is used to send switching commands to the control unit for solenoid valve A61, first liquid pump 62, solenoid valve B71, second liquid pump 72, compressed air solenoid valve 81, and air pump 82.

[0069] The control unit receives digital switching signals from the control unit, converts these signals into switching signals, and sends them to solenoid valve A61, first liquid pump 62, solenoid valve B71, second liquid pump 72, compressed air solenoid valve 81, and air pump 82. This controls the simultaneous opening of solenoid valve A61, first liquid pump 62, solenoid valve B71, second liquid pump 72, compressed air solenoid valve 81, and air pump 82. It also controls the simultaneous closing of solenoid valve A61, first liquid pump 62, solenoid valve B71, and second liquid pump 72, with compressed air solenoid valve 81 and air pump 82 closing after a 5-second delay. Furthermore, it controls the opening and closing of solenoid valve A61, solenoid valve B71, and compressed air solenoid valve 81, adjusting the hydraulic pressure in the first and second chambers and regulating the air pressure in the mixing chamber.

[0070] Solenoid valve A is used to receive the switching signal from the control unit and control whether the first liquid tank 6 delivers liquid to the first chamber 3.

[0071] The first liquid pump is used to receive the switching signal from the control unit and control whether the first liquid tank 6 delivers liquid to the first chamber 3.

[0072] Solenoid valve B is used to receive the switching signal from the control unit and control whether the second liquid tank 7 delivers liquid to the second chamber 4.

[0073] The second liquid pump is used to receive the switching signal from the control unit and control whether the second liquid tank 7 delivers liquid to the second chamber 4.

[0074] The compressed air solenoid valve is used to receive the switching signal from the control unit and control whether the air source 8 delivers compressed gas to the mixing chamber 2.

[0075] An air pump is used to receive switching signals from the control unit and control whether the air source 8 delivers compressed gas to the mixing chamber 2.

[0076] Through the above system design, the present invention makes it easier for staff to control whether the nozzles spray outwards, thus enabling on-site emergency work to proceed smoothly.

[0077] The working process of the control system:

[0078] Nozzle spraying: Manually press the electronic switch to open solenoid valve A61, first liquid pump 62, solenoid valve B71, second liquid pump 72, compressed air solenoid valve 81, and air pump 82. The two liquids are sent from the first liquid tank 6 and the second liquid tank 7 into the first chamber 3 and the second chamber 4 respectively under the action of the first liquid pump 62 and the second liquid pump 72. Compressed gas enters the mixing chamber 2. At this time, check valve A32, check valve B42, and compressed air check valve 221 sense the pressure and open automatically, so that the two liquids enter the mixing chamber 2 from the first liquid outlet and the second liquid outlet respectively from two opposite directions and impact the mixing column 5. Under the action of compressed air, they are sprayed out from the nozzle 21.

[0079] Nozzle stops spraying: Turn off the electronic switch, close solenoid valve A61, first liquid pump 62, solenoid valve B71 and second liquid pump 72, and close compressed air solenoid valve 81 and air pump 82 after a 5-second delay. Solenoid valves A61 and B71 are closed, and the first liquid tank 6 and the second liquid tank 7 stop supplying liquid to the first chamber 3 and the second chamber 4. However, the air source 8 continues to supply gas to the mixing chamber 2. At this time, check valves A32 and B42 automatically close because they do not sense pressure, preventing the mixed liquid from flowing back. Compressed air check valve 221 also closes after a 5-second delay. The residual polyurethane liquid in the nozzle is sprayed out under the action of compressed air, completing the self-cleaning process.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-cleaning nozzle, characterized in that: Includes a housing (1), a mixing chamber (2) is provided inside the housing (1), a first chamber (3) and a second chamber (4) are provided on both sides of the mixing chamber (2), a spray outlet (21) communicating with the mixing chamber (2) is provided on one side of the housing (1), an air inlet (22) communicating with the mixing chamber (2) is provided on the side of the housing (1) away from the spray outlet (21), a first liquid supply port (31) communicating with the first chamber (3), and a second liquid supply port (41) communicating with the second chamber (4); The mixing chamber (2) is provided with a mixing column (5). The inner wall of the mixing chamber (2) is provided with a first liquid outlet communicating with the first chamber (3) and a second liquid outlet communicating with the second chamber (4). The first liquid outlet and the second liquid outlet are respectively arranged opposite to the mixing column (5). A one-way valve A (32) is installed in the first chamber (3) adjacent to the first liquid outlet, a one-way valve B (42) is installed in the second chamber (4) adjacent to the second liquid outlet, and a compressed air one-way valve (221) is installed in the mixing chamber (2) adjacent to the air inlet (22); the diameter ratio of the mixing chamber (2) adjacent to the first liquid outlet and the second liquid outlet to the diameter of the mixing column (5) is (6-10):5, the diameter ratio of the first liquid outlet to the diameter of the mixing column (5) is (4-7):3, and the diameter ratio of the second liquid outlet to the diameter of the mixing column (5) is... The ratio is (4-7):3; the top of the shell (1) is provided with a first groove (11), the center of the first groove (11) is provided with a threaded through hole (12) communicating with the mixing chamber (2), the inner wall of the mixing chamber (2) is provided with an embedded hole (13) corresponding to the upper and lower of the threaded through hole (12), the mixing column (5) includes a screw that passes through the threaded through hole (12), one end of the screw is provided with a limiting plate (51) embedded in the first groove (11), and the other end of the screw passes through the threaded through hole (12) and is embedded in the embedded hole (13).

2. The self-cleaning nozzle according to claim 1, characterized in that: The housing (1) has machining holes (14) on both sides, and the machining holes (14) are sealed with threaded plugs.

3. The self-cleaning nozzle according to claim 1, characterized in that: The shell (1) and the mixing column (5) are made of aluminum alloy, and the outer surfaces of the shell (1) and the mixing column (5) are provided with an oxide layer.

4. The self-cleaning nozzle according to claim 1, characterized in that: The housing (1) is provided with a mounting hole (15) that runs longitudinally through the housing (1).

5. The self-cleaning nozzle according to claim 1, characterized in that: The air inlet (22), the first liquid supply port (31), the second liquid supply port (41), the spray outlet (21), and the machining hole (14) are all provided with internal threads.

6. The self-cleaning nozzle according to claim 1, characterized in that: The diameter of the first chamber (3) is smaller than the diameter of the first liquid supply port (31); the diameter of the second chamber (4) is smaller than the diameter of the second liquid supply port (41); the diameter of the mixing chamber (2) is smaller than the diameter of the air inlet (22) and the nozzle (21).

7. A spraying device, characterized in that: The nozzle includes a self-cleaning nozzle as described in any one of claims 1-6, wherein a first liquid supply port (31) is connected to a first liquid tank (6) via a pipeline, and a solenoid valve A (61) and a first liquid pump (62) are installed on the pipeline connecting the first liquid supply port (31) and the first liquid tank (6); a second liquid supply port (41) is connected to a second liquid tank (7) via a pipeline, and a solenoid valve B (71) and a second liquid pump (72) are installed on the pipeline connecting the second liquid supply port (41) and the second liquid tank (7); and an air inlet (22) is connected to an air source (8) via a pipeline, and a compressed air solenoid valve (81) and an air pump (82) are installed on the pipeline connecting the air inlet (22) and the air source (8).

8. A control system based on the injection device of claim 7, characterized in that, include Electronic switches are used to send digital signals for switching solenoid valve A (61), first liquid pump (62), solenoid valve B (71), second liquid pump (72), compressed air solenoid valve (81) and air pump (82) to the control unit. The control unit is used to receive the digital switching signal of the electronic switch, convert the digital switching signal into a switching signal, and send the switching signal to solenoid valve A (61), first liquid pump (62), solenoid valve B (71), second liquid pump (72), compressed air solenoid valve (81) and air pump (82) to control solenoid valve A (61), first liquid pump (62), solenoid valve B (71), second liquid pump (72), compressed air solenoid valve (81) and air pump (82) to open simultaneously; It is also used to control the simultaneous closure of solenoid valve A (61), the first liquid pump (62), solenoid valve B (71), and the second liquid pump (72), and the delayed closure of compressed air solenoid valve (81) and air pump (82); it is also used to control the opening and closing of solenoid valve A (61), solenoid valve B (71), and compressed air solenoid valve (81), to adjust the hydraulic pressure in the first chamber and the second chamber, and to adjust the air pressure in the mixing chamber; Solenoid valve A is used to receive the switching signal from the control unit and control whether the first liquid tank (6) delivers liquid to the first chamber (3); The first liquid pump is used to receive the switch signal from the control unit and control whether the first liquid tank (6) delivers liquid to the first chamber (3); Solenoid valve B is used to receive the switching signal from the control unit and control whether the second liquid tank (7) delivers liquid to the second chamber (4); The second liquid pump is used to receive the switch signal from the control unit and control whether the second liquid tank (7) delivers liquid to the second chamber (4); The compressed air solenoid valve is used to receive the switching signal from the control unit and control whether the air source (8) delivers compressed gas to the mixing chamber (2); An air pump is used to receive the switching signal from the control unit and control whether the air source (8) delivers compressed gas to the mixing chamber (2).

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