CN220143733U

CN220143733U - Self-cleaning nozzle, spraying device and control system

Info

Publication number: CN220143733U
Application number: CN202321516180.XU
Authority: CN
Inventors: 边勇; 尚士进; 孟瑞; 蔡波; 刘福秀; 刘若思; 董建蕊
Original assignee: China Customs Science And Technology Research Center
Current assignee: China Customs Science And Technology Research Center
Priority date: 2023-06-14
Filing date: 2023-06-14
Publication date: 2023-12-08
Anticipated expiration: 2033-06-14

Abstract

The utility model relates to a self-cleaning nozzle, a spraying device and a control system, which comprise a shell, wherein a mixing chamber is arranged in the shell, a first chamber and a second chamber are respectively arranged at two sides of the mixing chamber, a spraying port communicated with the mixing chamber is arranged at one side of the shell, an air inlet communicated with the mixing chamber is respectively arranged at one side of the shell away from the spraying port, a first liquid supply port communicated with the first chamber, and a second liquid supply port communicated with the second chamber; the mixing chamber is internally provided with a mixing column, the inner wall of the mixing chamber is respectively provided with a first liquid outlet communicated with the first chamber and a second liquid outlet communicated with the second chamber, and the first liquid outlet and the second liquid outlet are respectively arranged opposite to the mixing column; the spray gun is simple in structure, low in cost and easy to manufacture, the on-site working preparation time is effectively saved, and the working efficiency is improved.

Description

Self-cleaning nozzle, spraying device and control system

Technical Field

The utility model relates to the technical field of self-cleaning of spray guns, in particular to a self-cleaning spray nozzle, a spray device and a control system.

Background

The spray gun is a device which uses liquid or compressed air to quickly release the liquid or compressed air as power, and comprises a nozzle which is manufactured to be flat; the gun head is convenient to replace, low in cost and capable of effectively preventing the gun head from falling off and wearing.

At airports, stations, ports and the like, passengers carry more luggage, if the packing is damaged in the transportation process to cause leakage of pollutants, professionals cannot reach the scene for analyzing the pollutants in the first time, and currently, a spray gun is used for spraying bi-component emergency curing agents to the pollutants, and the spray gun is required to fully mix the two polyurethanes and then spray the two polyurethanes. After polyurethane mixes, can foam, inflation, solidification in very short time, after the spray gun stops spraying, there is a small amount of polyurethane liquid after mixing to remain in the spray gun nozzle, and the mixed polyurethane liquid of remaining can quick inflation solidification, blocks up mixing chamber and nozzle in the spray gun, causes when using next time, and the nozzle blocks up unable blowout, the unable reuse phenomenon of equipment, and manual cleaning is wasted time and energy, and efficiency is not high.

Accordingly, there is a need in the art to provide a self-cleaning nozzle, a spray device and a control system.

Disclosure of Invention

The utility model aims to provide a self-cleaning nozzle, a spraying device and a control system, which are designed to solve the problem that a small amount of mixed polyurethane liquid remains in the nozzle to block a mixing cavity after the spraying of the existing spray gun is stopped.

The self-cleaning nozzle comprises a shell, wherein a mixing chamber is arranged in the shell, a first chamber and a second chamber are respectively arranged at two sides of the mixing chamber, a jet orifice communicated with the mixing chamber is arranged at one side of the shell, an air inlet communicated with the mixing chamber is respectively arranged at one side of the shell away from the jet orifice, a first liquid supply port communicated with the first chamber, and a second liquid supply port communicated with the second chamber;

the mixing chamber is internally provided with a mixing column, the inner wall of the mixing chamber is respectively provided with a first liquid outlet communicated with the first chamber and a second liquid outlet communicated with the second chamber, and the first liquid outlet and the second liquid outlet are respectively arranged opposite to the mixing column;

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

Preferably, the ratio of the diameter of the mixing chamber immediately adjacent to the first and second outlets to the diameter of the mixing column is 8:5, the diameter ratio of the first liquid outlet to the mixing column is 5:3, the diameter ratio of the second liquid outlet to the mixing column is 5:3 is the most preferred scheme.

Preferably, the top of the shell is provided with a first groove, the center of the first groove is provided with a threaded through hole communicated with the mixing cavity, the inner wall of the mixing cavity is provided with an embedded hole which is correspondingly arranged up and down with the threaded through hole, the mixing column comprises a screw rod which is penetrated and assembled with the threaded through hole, one end of the screw rod is provided with a limiting plate which is embedded in the first groove, and the other end of the screw rod penetrates from the threaded through hole and is embedded in the embedded hole.

Preferably, processing holes are formed in two sides of the shell, and plugs are plugged in the processing holes.

Preferably, the shell and the mixing column are made of aluminum alloy, and the outer surfaces of the shell and the mixing column are provided with an oxide layer.

Preferably, the housing is provided with mounting holes extending longitudinally through the housing.

Preferably, the air inlet, the first liquid supply port, the second liquid supply port, the ejection port and the processing hole are all provided with internal threads.

Preferably, the first chamber diameter is smaller than the first liquid supply port diameter; the diameter of the second cavity is smaller than that of the second liquid supply port; the mixing chamber diameter is smaller than the inlet and outlet diameters.

The utility model provides an injection device, which comprises a self-cleaning nozzle, wherein a first liquid supply port is communicated with a first liquid tank through a pipeline, and an electromagnetic valve A and a first liquid pump are arranged on the pipeline, which is communicated with the first liquid tank, of the first liquid supply port; the second liquid supply port is communicated with a second liquid tank through a pipeline, and an electromagnetic valve B and a second liquid pump are arranged on the pipeline for communicating the second liquid supply port with the second liquid tank; the air inlet is communicated with an air source through a pipeline, and a compressed air electromagnetic valve and an air pump are arranged on the pipeline for communicating the air inlet with the air source.

The utility model relates to a control system of an injection device, which comprises

The electronic switch is used for sending the opening digital signals of the electromagnetic valve A, the electromagnetic valve B and the compressed air electromagnetic valve to the control unit;

the control unit is used for receiving the switch digital signal of the electronic switch, converting the switch digital signal into a switch value signal, sending the switch value signal to the electromagnetic valve A, the first liquid pump, the electromagnetic valve B, the second liquid pump, the compressed air electromagnetic valve and the air pump, and controlling the electromagnetic valve A, the first liquid pump, the electromagnetic valve B, the second liquid pump, the compressed air electromagnetic valve and the air pump to be simultaneously opened;

the device is also used for controlling the electromagnetic valve A, the first liquid pump, the electromagnetic valve B and the second liquid pump to be closed simultaneously, and the compressed air electromagnetic valve and the air pump are closed after 5 seconds of delay; the device is also used for controlling the opening and closing sizes of the solenoid valve A, the solenoid valve B and the compressed air solenoid valve, regulating the hydraulic pressure in the first cavity and the second cavity and regulating the air pressure in the mixing cavity;

the electromagnetic valve A is used for receiving a switching value signal of the control unit and controlling whether the first liquid tank conveys liquid to the first cavity or not;

the first liquid pump is used for receiving the switching value signal of the control unit and controlling whether the first liquid tank conveys liquid to the first cavity or not;

the electromagnetic valve B is used for receiving the switching value signal of the control unit and controlling whether the second liquid tank conveys liquid to the second cavity;

the second liquid pump is used for receiving the switching value signal of the control unit and controlling whether the second liquid tank conveys liquid to the second cavity or not;

the compressed air electromagnetic valve is used for receiving the switching value signal of the control unit and controlling whether the air source transmits compressed air to the mixing chamber or not;

and the air pump is used for receiving the switching value signal of the control unit and controlling whether the air source transmits compressed air to the mixing chamber.

Preferably, the hydraulic pressure in the first chamber and the second chamber is equal to the air pressure in the mixing chamber, the hydraulic pressure and the air pressure being equal to or greater than 2mp.

Compared with the prior art, the self-cleaning nozzle, the spraying device and the control system provided by the utility model have the following improvements:

1. according to the self-cleaning nozzle provided by the utility model, the first liquid outlet and the second liquid outlet which are oppositely arranged are designed, the mixing column is designed between the first liquid outlet and the second liquid outlet, and when the self-cleaning nozzle is used for spraying, liquid in the first cavity and the liquid in the second cavity respectively impact the mixing column from the first liquid outlet and the second liquid outlet, so that the two liquids are fully mixed, the mixing column is detachably connected with the shell, and the interior of the nozzle is convenient to clean in the later stage of use.

2. The processing holes are formed in the two sides of the shell, the processing holes are plugged with plugs, so that the first liquid outlet and the second liquid outlet are conveniently cleaned in the later use period, and liquid deposition in the first liquid outlet and the second liquid outlet is avoided, and the liquid spraying effect is prevented from being influenced.

3. The compressed air electromagnetic valve is closed 5 seconds later than the electromagnetic valve A and the electromagnetic valve B when the injection is stopped, residual mixed liquid is completely discharged from the injection port by utilizing compressed gas for the first time, the nozzle is prevented from being blocked, workers are prevented from manually cleaning the nozzle before using the spray gun next time, the structure is simple, the cost is low, the manufacture is easy, the site work preparation time is effectively saved, and the work efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view (cross-sectional view) of a self-cleaning nozzle according to the present utility model;

FIG. 2 is a schematic view (cross-sectional view) of the self-cleaning nozzle according to the present utility model;

FIG. 3 is a schematic view (perspective) of a mixing column according to the present utility model;

FIG. 4 is a schematic view (perspective view) of the self-cleaning nozzle according to the present utility model;

FIG. 5 is a schematic view of a spray device according to the present utility model;

fig. 6 is a control system diagram of the injection device according to the present utility model.

Reference numerals illustrate:

1. a housing; 11. a first groove; 12. a threaded through hole; 13. an embedded hole; 14. processing a hole; 15. a mounting hole; 2. a mixing chamber; 3. a first chamber; 4. a second chamber; 21. an ejection port; 22. an air inlet; 221. a compressed air one-way valve; 31. a first liquid supply port; 32. a one-way valve A; 41. a second liquid supply port; 42. a one-way valve B; 5. a mixing column; 51. a limiting plate; 6. a first liquid tank; 61. a solenoid valve A; 62. a first liquid pump; 7. a second liquid tank; 71. a solenoid valve B; 72. a second liquid pump; 8. a gas source; 81. a compressed air solenoid valve; 82. an air pump.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, 2 and 3, the self-cleaning nozzle provided in this embodiment includes a housing 1, a mixing chamber 2 is provided in the housing 1, two sides of the mixing chamber 2 are respectively provided with a first chamber 3 and a second chamber 4, one side of the housing 1 is provided with an ejection port 21 communicated with the mixing chamber 2, one side of the housing 1 far from the ejection port 21 is respectively provided with an air inlet 22 communicated with the mixing chamber 2, a first liquid supply port 31 communicated with the first chamber 3, and a second liquid supply port 41 communicated with the second chamber 4; the mixing chamber 2 is internally provided with a mixing column 5, the inner wall of the mixing chamber 2 is respectively provided with a first liquid outlet communicated with the first chamber 3 and a second liquid outlet communicated with the second chamber 4, and the first liquid outlet and the second liquid outlet are respectively opposite to the mixing column 5; a one-way valve A32 is arranged in the first chamber 3 close to the first liquid outlet, a one-way valve B42 is arranged in the second chamber 4 close to the second liquid outlet, and a compressed air one-way valve 221 is arranged in the mixing chamber 2 close to the air inlet 22.

According to the utility model, through the structural design, the mixing column 5 is designed between the first liquid outlet and the second liquid outlet by utilizing the first liquid outlet and the second liquid outlet which are oppositely arranged, so that the liquids sprayed out of the first liquid outlet and the second liquid outlet can be fully mixed, the liquids are uniformly mixed, and the rapid solidification of the mixed liquid is further realized; the liquid in the first cavity 3 and the second cavity 4 is impacted to mix the post 5 from first liquid outlet and second liquid outlet respectively, makes two kinds of liquid intensive mixing, and the high-pressure gas that air inlet 22 got into simultaneously can be with the high-speed blowout of mixed liquid, and the post 5 of mixing simultaneously can narrow gas runner, and then the velocity of flow when changing liquid mixing and to the vortex effect of liquid, reaches intensive mixing's effect. When the spraying is stopped, the residual mixed liquid is completely discharged from the spraying outlet 21 by using the compressed gas, so that the nozzle is prevented from being blocked, and a worker is prevented from manually cleaning the nozzle before using the spray gun next time. Meanwhile, as the first liquid outlet and the second liquid outlet are opposite to the mixing column 5, redundant liquid at the first liquid outlet and the second liquid outlet can be brought out when high-pressure air passes through, so that the first liquid outlet and the second liquid outlet are prevented from being blocked by residual curing agent; the utility model has simple structure, low cost, easy manufacture, good spraying effect and high working efficiency.

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

the ratio of the diameter of the mixing chamber 2 to the diameter of the mixing column 5, which is close to the first liquid outlet and the second liquid outlet, is (6-10): 5, the diameter of the mixing chamber 2 can be reduced, so that a gas circulation channel is narrowed, compressed air can be forced to flow through the first liquid outlet and the second liquid outlet at high speed, and residual liquid can be carried out, blown off and emptied.

The diameter ratio of the first liquid outlet to the mixing column (5) is (4-7): 3, the diameter ratio of the second liquid outlet to the mixing column (5) is (4-7): 3, the flow speed during liquid mixing and the detour effect on the liquid can be related, and the mixing effect of the two liquids is further affected.

In a particular embodiment, in a particular preparation, the ratio of the diameter of the mixing chamber 2 immediately adjacent to the first and second outlets to the diameter of the mixing column 5 is 8:5, the diameter ratio of the first liquid outlet to the mixing column 5 is 5:3, the diameter ratio of the second liquid outlet to the mixing column 5 is 5:3.

the processing can be performed according to a set proportion, and the details are not repeated here.

Through the design, the utility model can fully mix two different liquids, achieves the aim of quick solidification and enables the on-site spraying work to be smoothly carried out.

As shown in fig. 4, the top of the housing 1 in this embodiment is provided with a first groove 11, the center of the first groove 11 is provided with a threaded through hole 12 communicated with the mixing chamber 2, and the inner wall of the mixing chamber 2 is provided with embedded holes 13 which are arranged up and down corresponding to the threaded through hole 12; the mixing column 5 comprises a screw rod penetrating through the threaded through hole 12, one end of the screw rod is provided with a limiting plate 51 embedded in the first groove 11, and the other end of the screw rod penetrates through the threaded through hole 12 and is embedded in the embedded hole 13.

Through the design of the structure, the shell 1 and the mixing column 5 are detachably connected by the threaded through hole 12 and the screw, so that later replacement is facilitated, meanwhile, the interior of the mixing chamber 2 is conveniently cleaned regularly, and the normal use of the later stage is ensured.

As shown in fig. 1, processing holes 14 are formed in both sides of the housing 1, and the processing holes 14 are plugged with plugs.

According to the utility model, through the structural design, a worker can conveniently process the transverse cavity in the nozzle, the processing process is simpler and more convenient, the processing hole 14 is sealed by utilizing the plug in the spraying and cleaning processes of the nozzle, the sealing performance of the whole nozzle is ensured, the first liquid outlet and the second liquid outlet are conveniently cleaned in the regular cleaning process, and the curing agent is prevented from being deposited on the first liquid outlet and the second liquid outlet, so that the spraying effect of liquid is influenced.

According to the utility model, 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 oxide layers.

By the design, the aluminum material has low cost, light weight and convenient carrying, and the surface is provided with the oxide layer for protecting and prolonging the service life of the nozzle.

As shown in fig. 2, the housing 1 of the present embodiment is provided with four mounting holes 15 penetrating the housing 1 longitudinally.

According to the utility model, through the structural design, the installation position of the electronic switch is reserved, so that the electronic switch can be conveniently installed subsequently.

Specifically, the air inlet 22, the first liquid supply port 31, the second liquid supply port 41, the ejection port 21, and the processing hole 14 are provided with female screws.

Through the structural design, the utility model is convenient for the air inlet 22 to be connected with the air source 8 through a pipeline, is convenient for the first liquid supply port 31 to be connected with the first liquid tank 6 and the second liquid supply port 41 to be connected with the second liquid tank 7, ensures the overall tightness through the screw design, is convenient for the ejection port 21 to be connected with the flat head water nozzle, and can help the nozzle to eject the fan-shaped mixed liquid, so that the ejection area is increased, and the working efficiency is improved.

The diameter of the first chamber 3 of the present embodiment is smaller than the diameter of the first liquid supply port 31; the diameter of the second chamber 4 is smaller than that of the second liquid supply port 41; the mixing chamber 2 has a diameter smaller than the diameters of the inlet port 22 and the outlet port 21.

Through the structural design, the compressed gas obtains larger pressure to smoothly spray the two liquids, so that the two liquids obtain larger pressure to impact the mixing column 5, and the liquids are fully mixed.

As shown in fig. 5, the present utility model provides an injection device, comprising a self-cleaning nozzle, a first liquid supply port 31 is communicated with a first liquid tank 6 through a pipeline, and a solenoid valve a61 and a first liquid pump 62 are installed on the pipeline where the first liquid supply port 31 is communicated with the first liquid tank 6; the second liquid supply port 41 is communicated with the second liquid tank 7 through a pipeline, and an electromagnetic valve B71 and a second liquid pump 72 are arranged on the pipeline for communicating the second liquid supply port 41 with the second liquid tank 7; the air inlet 22 is communicated with the air source 8 through a pipeline, and a compressed air electromagnetic valve 81 and an air pump 82 are arranged on the pipeline of the air inlet 22 communicated with the air source 8.

Through the design, the electronic switch is controlled to send signals to the electromagnetic valve, and whether the liquid in the liquid tank is externally sprayed or not is controlled by the electromagnetic valve A61, the electromagnetic valve B71 and the compressed air electromagnetic valve 81, so that the working efficiency is intelligently and conveniently improved.

As shown in FIG. 6, the present utility model provides a control system of an injection device, comprising

An electronic switch for sending switching instructions of the solenoid valve a61, the first liquid pump 62, the solenoid valve B71, the second liquid pump 72, the compressed air solenoid valve 81 and the air pump 82 to the control unit;

the control unit is used for receiving the switch digital signal of the control unit, converting the switch digital signal into a switch value signal, sending the switch value signal to the electromagnetic valve A61, the first liquid pump 62, the electromagnetic valve B71, the second liquid pump 72, the compressed air electromagnetic valve 81 and the air pump 82, and controlling the electromagnetic valve A61, the first liquid pump 62, the electromagnetic valve B71, the second liquid pump 72, the compressed air electromagnetic valve 81 and the air pump 82 to be simultaneously opened; the control device is also used for controlling the solenoid valve A61, the first liquid pump 62, the solenoid valve B71 and the second liquid pump 72 to be closed simultaneously, and the compressed air solenoid valve 81 and the air pump 82 are closed after 5 seconds; the hydraulic control device is also used for controlling the opening and closing sizes of the solenoid valve A61, the solenoid valve B71 and the compressed air solenoid valve 81, regulating the hydraulic pressure in the first chamber and the second chamber and regulating the air pressure in the mixing chamber;

the electromagnetic valve A is used for receiving a switching value signal of the control unit and controlling whether the first liquid tank 6 conveys liquid to the first chamber 3 or not;

the first liquid pump is used for receiving a switching value signal of the control unit and controlling whether the first liquid tank 6 is used for conveying liquid to the first cavity 3 or not;

a solenoid valve B for receiving a switching value signal of the control unit and controlling whether the second liquid tank 7 delivers liquid to the second chamber 4;

the second liquid pump is used for receiving the switching value signal of the control unit and controlling whether the second liquid tank 7 is used for conveying liquid to the second cavity 4;

the compressed air electromagnetic valve is used for receiving a switching value signal of the control unit and controlling whether the air source 8 transmits compressed air to the mixing chamber 2 or not;

and the air pump is used for receiving the switching value signal of the control unit and controlling whether the air source 8 supplies compressed air to the mixing chamber 2.

Through the system design, the utility model is more convenient for staff to control whether the nozzle sprays outwards or not, so that the on-site emergency work is smoothly carried out.

The working process of the control system is as follows:

spraying a nozzle: the electronic switch is manually pressed down, the electromagnetic valve A61, the first liquid pump 62, the electromagnetic valve B71, the second liquid pump 72, the compressed air electromagnetic valve 81 and the air pump 82 are started, two liquids are respectively fed into the first chamber 3 and the second chamber 4 from the first liquid tank 6 and the second liquid tank 7 under the action of the first liquid pump 62 and the second liquid pump 72, compressed air enters the mixing chamber 2, at the moment, the check valve A32, the check valve B42 and the compressed air check valve 221 sense pressure to be automatically opened, so that the two liquids respectively enter the mixing chamber 2 from two opposite directions, impact the mixing column 5, and are sprayed out from the spraying port 21 under the action of compressed air.

The nozzle stops spraying: the electronic switch is closed, the electromagnetic valve A61, the first liquid pump 62, the electromagnetic valve B71 and the second liquid pump 72 are closed, the compressed air electromagnetic valve 81 and the air pump 82 are closed after 5 seconds, the electromagnetic valve A61 and the electromagnetic valve B71 are closed, the first liquid tank 6 and the second liquid tank 7 stop conveying liquid to the first chamber 3 and the second chamber 4, but the air source 8 still continues conveying gas to the mixing chamber 2, at the moment, the check valve A32 and the check valve B42 are not automatically closed after sensing pressure, the mixed liquid is prevented from flowing back, the compressed air check valve 221 is also closed after 5 seconds, and residual polyurethane liquid in the nozzle is sprayed out under the action of the compressed air, so that the self-cleaning process is completed.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A self-cleaning nozzle, characterized in that: the device comprises a shell (1), wherein a mixing chamber (2) is arranged in the shell (1), a first chamber (3) and a second chamber (4) are respectively arranged at two sides of the mixing chamber (2), an ejection port (21) communicated with the mixing chamber (2) is arranged at one side of the shell (1), an air inlet (22) communicated with the mixing chamber (2) is respectively arranged at one side of the shell (1) away from the ejection port (21), a first liquid supply port (31) communicated with the first chamber (3) and a second liquid supply port (41) communicated with the second chamber (4);

a mixing column (5) is arranged in the mixing chamber (2), a first liquid outlet communicated with the first chamber (3) and a second liquid outlet communicated with the second chamber (4) are respectively formed in the inner wall of the mixing chamber (2), and the first liquid outlet and the second liquid outlet are respectively opposite to the mixing column (5);

a one-way valve A (32) is arranged in the first chamber (3) close to the first liquid outlet, a one-way valve B (42) is arranged in the second chamber (4) close to the second liquid outlet, and a compressed air one-way valve (221) is arranged in the mixing chamber (2) close to the air inlet (22).

2. A self-cleaning nozzle according to claim 1, characterized in that: the ratio of the diameter of the mixing chamber (2) to the diameter of the mixing column (5) in close proximity to the first and second liquid outlets is (6-10): 5, the diameter ratio of the first liquid outlet to the mixing column (5) is (4-7): 3, the diameter ratio of the second liquid outlet to the mixing column (5) is (4-7): 3.

3. a self-cleaning nozzle according to claim 1, characterized in that: the top of casing (1) is equipped with first recess (11), first recess (11) center be equipped with mix threaded through hole (12) of cavity (2) intercommunication, mix cavity (2) inner wall offer with threaded through hole (12) upper and lower correspond embedded hole (13) that set up, mix post (5) include with threaded through hole (12) wears the screw rod of dress, screw rod one end is equipped with limiting plate (51) in embedding first recess (11), the screw rod other end penetrates and embedded in embedded hole (13) from threaded through hole (12).

4. A self-cleaning nozzle according to claim 1, characterized in that: processing holes (14) are formed in two sides of the shell (1), and plugs are plugged in the processing holes (14).

5. A 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 oxide layers.

6. A self-cleaning nozzle according to claim 1, characterized in that: the housing (1) is provided with a mounting hole (15) penetrating the housing (1) longitudinally.

7. A 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 ejection port (21) and the processing hole (14) are all provided with internal threads.

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

9. An ejector device, characterized in that: comprising a self-cleaning nozzle according to any one of claims 1-8, the first liquid supply port (31) being in communication with the first liquid tank (6) via a pipeline, the pipeline of the first liquid supply port (31) in communication with the first liquid tank (6) being provided with an electromagnetic valve a (61) and a first liquid pump (62); the second liquid supply port (41) is communicated with the second liquid tank (7) through a pipeline, and an electromagnetic valve B (71) and a second liquid pump (72) are arranged on the pipeline for communicating the second liquid supply port (41) with the second liquid tank (7); the air inlet (22) is communicated with the air source (8) through a pipeline, and a compressed air electromagnetic valve (81) and an air pump (82) are arranged on the pipeline for communicating the air inlet (22) with the air source (8).

10. A control system based on the injection device of claim 9, comprising

An electronic switch for sending switch digital signals of the electromagnetic valve A (61), the first liquid pump (62), the electromagnetic valve B (71), the second liquid pump (72), the compressed air electromagnetic valve (81) and the air pump (82) to the control unit;

the control unit is used for receiving the switch digital signal of the electronic switch, converting the switch digital signal into a switch value signal, and sending the switch value signal to the electromagnetic valve A (61), the first liquid pump (62), the electromagnetic valve B (71), the second liquid pump (72), the compressed air electromagnetic valve (81) and the air pump (82), and controlling the electromagnetic valve A (61), the first liquid pump (62), the electromagnetic valve B (71), the second liquid pump (72), the compressed air electromagnetic valve (81) and the air pump (82) to be simultaneously opened;

the device is also used for controlling the electromagnetic valve A (61), the first liquid pump (62), the electromagnetic valve B (71) and the second liquid pump (72) to be closed simultaneously, and the compressed air electromagnetic valve (81) and the air pump (82) to be closed in a delayed manner; the device is also used for controlling the opening and closing sizes of the electromagnetic valve A (61), the electromagnetic valve B (71) and the compressed air electromagnetic valve (81), regulating the hydraulic pressure in the first cavity and the second cavity and regulating the air pressure in the mixing cavity;

the electromagnetic valve A is used for receiving a switching value signal of the control unit and controlling whether the first liquid tank (6) conveys liquid to the first chamber (3);

the first liquid pump is used for receiving a switching value signal of the control unit and controlling whether the first liquid tank (6) conveys liquid to the first chamber (3);

the electromagnetic valve B is used for receiving a switching value signal of the control unit and controlling whether the second liquid tank (7) conveys liquid to the second chamber (4);

the second liquid pump is used for receiving the switching value signal of the control unit and controlling whether the second liquid tank (7) conveys liquid to the second chamber (4);

the compressed air electromagnetic valve is used for receiving a switching value signal of the control unit and controlling whether the air source (8) transmits compressed air to the mixing chamber (2);

and the air pump is used for receiving the switching value signal of the control unit and controlling whether the air source (8) transmits compressed air to the mixing chamber (2).