WO2022057112A1

WO2022057112A1 - Suspension liquid cold gas dynamic spray system and application thereof

Info

Publication number: WO2022057112A1
Application number: PCT/CN2020/135687
Authority: WO
Inventors: 卢静; 解路; 吴应东; 汤烈明; 孙澄川; 李挺
Original assignee: 季华实验室
Priority date: 2020-09-15
Filing date: 2020-12-11
Publication date: 2022-03-24
Also published as: CN112090609B; CN112090609A

Abstract

A suspension liquid cold gas dynamic spray system and an application thereof. The suspension liquid cold gas dynamic spray system comprises a control device (1), a spray gun device (4), a primary gas supply device (6), a liquid conveying air supply device (9), and a suspension liquid feeder (10). According to the system, nanoscale material powder is conveyed by using a liquid as a medium, a suspension liquid is dispersed into atomized droplets by means of an atomizing nozzle (11), the nanoscale powder droplets are carried by heating gas to enter a spray gun (4), the droplets are accelerated in the Laval spray gun (4) and then sprayed to a base material, and finally deposition is performed on the surface of the base material to form a nano material coating. A cold spraying technology is used for preparing the nano material coating, the process advantages of the cold spraying technology can be combined, the consistency of the microstructure of the coating and the microstructure of an original nano material is guaranteed, the material is prevented from being modified in the spraying process, and therefore the characteristics of high bonding strength, low porosity and the like of the nano material coating are kept to the maximum extent.

Description

Suspension Cold Air Power Spraying System and Its Application

technical field

The invention relates to the technical field of cold air power spraying, in particular to a suspension cold air power spraying system and its application.

Background technique

Air-conditioning spraying technology is a new technology for surface modification of materials that is easy to operate, safe and green. Cold air dynamic spraying refers to the formation of a dense coating by shooting the coating powder onto the substrate by supersonic gas and solid two-phase airflow at room temperature or lower temperature. Since the spraying technology does not have high temperature heating, the adverse effects of high temperature oxidation, gasification, phase change, ablation, etc. on the coating performance during the spraying process are reduced, making it suitable for aerospace, additive manufacturing, rail transit and other fields. Broad application prospects.

Due to the high strength of nanomaterials, less microcracks, excellent thermal shock resistance, and low wear, nanocoatings have become a very important research direction in the field of surface engineering in recent years. At present, thermal spraying technology is mainly used for the preparation of nanoscale material coatings. However, the high temperature in the thermal spraying process will change the physical properties of nanomaterials, and an ideal nanomaterial coating cannot be obtained. Therefore, the use of cold spraying technology to prepare nanomaterial coatings can combine the technological advantages of cold spraying technology to ensure the consistency of the microstructure of the nanomaterial coating with the original nanomaterials, and avoid the modification of nanomaterials. However, due to the small particle size and poor fluidity of nano-scale particles, the spray deposition efficiency is low, and the deposition effect is not ideal. Therefore, the combination of nano-materials and cold air power spray technology has not been effectively applied.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a suspension cold air dynamic spraying system with high deposition efficiency and its application.

A suspension cold air power spraying system, comprising a control device, a spray gun device, a main gas supply device, a liquid supply air supply device and a suspension feeder, the spray gun device includes a spray gun;

the main gas supply device communicates with the main gas input port of the spray gun;

The liquid-feeding gas supply device is communicated with the suspension feeder;

The suspension feeder is communicated with the liquid material input port of the spray gun;

The spray gun device, the suspension feeder, the main gas supply device and the liquid supply gas supply device are all connected to the control device, respectively.

In one embodiment, the main gas supply device includes a liquid gas storage device, a vaporization device, a buffer device and a pressure regulating device connected in sequence, the liquid gas storage device is used for storing liquefied gas, and the vaporization device is used for The liquefied gas is vaporized, the buffer device is used to store the vaporized high-pressure main gas, and the pressure regulating device is used to adjust the high-pressure main gas to a preset pressure and output it at a constant pressure.

In one embodiment, the main gas supply device provides main gas for the spray gun, and the main gas is at least one of nitrogen, helium and air.

In one embodiment, the spray gun device further includes a robot arm, the spray gun is fixed on the robot arm, and the control device is connected to the robot arm.

In one embodiment, the manipulator can perform three-axis movement and three-axis rotation in space.

In one embodiment, the spray gun includes a Laval nozzle and a water cooling jacket, the Laval nozzle is provided with the main gas input port and the liquid material input port, and the water cooling jacket is wrapped around the puller nozzle. Exterior of the Vaal Nozzle.

In one embodiment, the suspension feeder is provided with an air inlet pipeline and a liquid outlet pipeline;

One end of the air intake pipeline is communicated with the liquid feeding gas supply device, and one end of the air intake pipeline is arranged above the liquid level of the suspension in the suspension feeder;

One end of the liquid outlet pipeline is communicated with the liquid material input port of the spray gun, and one end of the liquid outlet pipeline is arranged below the liquid level of the suspension in the suspension feeder.

In one embodiment, it also includes an atomizing nozzle, the atomizing nozzle is arranged between the suspension feeder and the spray gun, the atomizing nozzle is provided with a gas inlet, a liquid inlet and an atomizing vapor outlet, The gas inlet is communicated with the gas outlet of the liquid feeding gas supply device, the liquid inlet is communicated with the liquid outlet pipe of the suspension feeder, the atomizing steam outlet of the atomizing nozzle and the spray gun The said liquid material input port is connected.

In one embodiment, it further includes a gas heating device, the control device is connected to the gas heating device, the gas heating device is arranged between the main gas supply device and the spray gun, and the main gas supply device The output port of the gas heating device is communicated with the input port of the gas heating device, and the output port of the gas heating device is communicated with the main gas input port of the spray gun.

In one embodiment, the gas heating device includes a main heater, an auxiliary heater and a heat preservation device arranged in sequence, and the main gas output from the main gas supply device passes through the main heater, the auxiliary heater and the heat preservation device in sequence. The holding device reaches a preset gas temperature.

In one embodiment, it further includes a water cooling device, the control device is connected to the water cooling device, the water cooling device includes a first water cooling circuit and a second water cooling circuit, and the first water cooling circuit is connected to the spray gun The water cooling circuit is connected to form the first circulating cooling circuit;

The second water cooling circuit is communicated with the water cooling circuit of the gas heater to form a second circulating cooling circuit.

In one embodiment, the main heater, the auxiliary heater and the outside of the heat preservation device are respectively provided with a water cooling circuit, and the second water cooling circuit is respectively connected with the water cooling circuit of the main heater, The water cooling circuit of the auxiliary heater communicates with the water cooling circuit of the heat preservation device.

In one embodiment, a sample stage is further included, the sample stage is used for fixing the spraying substrate, and the spray gun is used for spraying the spraying base material fixed on the sample stage.

In one embodiment, the sample stage is capable of biaxial movement in a plane perpendicular to the spraying direction.

In one embodiment, a dedusting device is further included, and the dedusting device is used to collect the powder after spraying.

In one embodiment, the dust removal device includes a gravity separation dust collector and a filter cartridge dust collector connected in sequence.

The application of the suspension cold air dynamic spraying system in the preparation method of the coating, the preparation method of the coating comprises the following steps:

The powder with poor flowability is prepared to form a suspension;

Using the suspension cold air power spraying system and the cold air power spraying method, the suspension is sprayed on the surface of the substrate to form a coating on the surface of the substrate.

In the above-mentioned suspension cold air power spraying system, the liquid feeding air supply device is used to provide compressed air to the suspension feeder to transport the suspension, and the suspension feeder is used to transport the suspension to the spray gun. The main gas supply is used to deliver gas to the spray gun. The powder particles are transported to the spray gun in the medium of suspension and sprayed to the surface of the substrate through the spray gun to form a coating. The above-mentioned suspension cold air dynamic spraying system uses the form of suspension for spraying and conveying, which improves the fluidity of ultrafine powder particles, ensures high deposition efficiency of ultrafine powder particles in cold spraying, and improves the quality of the coating. The above suspension cold air dynamic spraying system is suitable for the preparation of coatings of nano-scale materials, and also suitable for the preparation of coatings of other nano- or sub-micron-scale materials with different particle sizes.

The control device is used to control the operation of the spray gun device, the suspension feeder, the main gas supply device and the liquid supply gas supply device. The spraying process parameters can be set globally through the control device, which can maximize the integrity of the spraying process parameters. It also increases the simplicity of parameter control.

The application of the above-mentioned suspension cold air dynamic spraying system in the coating preparation method, by preparing ultrafine powder particles to form a suspension, and then spraying by cold air dynamic spraying, the fluidity of the ultrafine powder particles is effectively improved, ensuring that The higher deposition efficiency of ultra-fine powder particles in cold spraying improves the quality of the coating.

Description of drawings

FIG. 1 is a schematic diagram of a suspension cold air dynamic spraying system according to an embodiment.

FIG. 2 is a schematic structural diagram of a main gas supply device according to an embodiment.

FIG. 3 is a schematic structural diagram of a spray gun according to an embodiment.

FIG. 4 is a schematic diagram of a suspension feeding process according to an embodiment.

FIG. 5 is a work order diagram of the control system according to an embodiment.

FIG. 6 is a working flow chart of spraying by the cold air dynamic spraying system of the suspension shown in FIG. 1 .

FIG. 7 is a flow chart of the application of the suspension cold air dynamic spraying system shown in FIG. 1 in the coating preparation method.

Among them, 1 is the control panel, 2 is the control cabinet, 3 is the manipulator, 4 is the spray gun, 5 is the sample stage, 6 is the main gas supply device, 7 is the gas heating device, 8 is the water cooling device, and 9 is the liquid supply gas supply device, 10 is a suspension feeder, 11 is an atomizing nozzle, 12 is a dust removal device, 13 is a storage device, 14 is a vaporization device, 15 is a buffer device, 16 is a pressure regulating device, 17 is the first pressure reducing valve, 18 is the first flow meter, 19 is the Laval nozzle, 20 is the water cooling jacket, 22 is the second pressure reducing valve, and 24 is the second flow meter.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be understood that the relationship indicating orientation or position such as "up" is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship that is usually placed when the product of the invention is used. , or the orientation or positional relationship commonly understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , so it should not be construed as a limitation of the present invention.

Furthermore, the terms "first", "second", etc. are only used to differentiate the description and should not be construed to indicate or imply relative importance.

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , an embodiment of a suspension cold air power spraying system includes a control device, a spray gun device, a main air supply device 6 , a liquid supply air supply device 9 and a suspension feeder 10 , and the spray gun device includes a spray gun 4 .

The main gas supply device 6 communicates with the main gas input port of the spray gun 4 .

The liquid-feeding gas supply device 9 communicates with the suspension feeder 10 .

The suspension feeder 10 communicates with the liquid material input port of the spray gun 4 .

The spray gun device, the suspension feeder 10, the main gas supply device 6 and the liquid supply gas supply device 9 are all connected to the control device, respectively.

In the above-mentioned suspension cold air power spraying system, the liquid feeding air supply device 9 is used to provide compressed air to the suspension feeder 10 to deliver the suspension, and the suspension feeder 10 is used to deliver the suspension to the spray gun 4 . The main gas supply device 6 is used to deliver the main gas for spraying to the spray gun 4 . The suspension can be sprayed onto the surface of the substrate through the spray gun 4 to form a nano-coating. The above-mentioned suspension cold air dynamic spraying system uses the suspension feeder 10 to spray and transport the suspension prepared by the Chaoxu powder material, which improves the fluidity of the ultra-fine powder material and ensures the high deposition of ultra-fine powder particles in the cold spraying. efficiency, improving the quality of the coating. The above-mentioned suspension cold air dynamic spraying system is suitable for the preparation of coatings of nano-scale materials, and also suitable for the preparation of coatings of other materials with different particle sizes.

The control device is used to control the spray gun device, the suspension feeder 10, the main gas supply device 6 and the liquid supply gas supply device 9 to work. The integrity also increases the simplicity of parameter control.

As shown in FIG. 2 , the main gas supply device 6 includes a liquid gas storage device, a vaporization device, a buffer device and a pressure regulating device which are connected in sequence. The liquid gas storage device 13 is used for storing liquefied gas. The vaporizing device 14 is used for vaporizing the liquefied gas. The buffer device 15 is used to store the vaporized high-pressure main gas. The pressure regulating device 16 is used to adjust the high pressure main gas to a preset pressure and output it at a constant pressure. The liquid gas storage device 13 and the vaporization device 14 ensure a sufficient supply of main gas. The buffer device 15 ensures the short-term air supply demand when the air source is insufficient. The pressure regulating device 16 satisfies the continuous and stable air pressure output. The four links jointly ensure the stability of the gas supply link of the spraying process.

Further, the main gas supply device 6 provides the main gas for the spray gun 4, and the main gas can be at least one of nitrogen, helium and air.

In the embodiment shown in FIG. 1 , the spray gun device further includes a manipulator, the spray gun 4 is fixed on the manipulator, and the control device is connected to the manipulator.

Further, the manipulator can perform three-axis movement and three-axis rotation in space. The spray gun 4 is fixed on the manipulator 3 through the flange, and under the clamping of the manipulator 3, the corresponding spraying action is completed with a preset spraying trajectory.

Please refer to FIG. 3 , the spray gun 4 includes a Laval nozzle 19 and a water cooling jacket 20 . The Laval nozzle 19 is provided with a main gas input port and a liquid material input port, and the water cooling jacket 20 is wrapped outside the Laval nozzle 19 . There is a water cooling circuit on the water cooling jacket 20 . The water cooling circuit on the water cooling jacket 20 can remove the heat around the spray gun 4 through the water circulation, and keep its temperature within a reasonable range.

Referring to FIG. 4 , the suspension feeder 10 is provided with an inlet pipeline and a liquid outlet pipeline. One end of the air inlet pipeline is communicated with the liquid feeding air supply device 9 , and the other end of the air inlet pipeline is arranged above the liquid level of the suspension in the suspension feeder 10 . One end of the liquid outlet pipeline is communicated with the liquid material input port of the spray gun 4 , and the other end of the liquid outlet pipeline is arranged below the liquid level of the suspension in the suspension feeder 10 .

Specifically, the suspension feeder 10 includes a cylinder body and a cover body, and the cover body is provided on the cylinder body. Both the liquid outlet pipeline and the air intake pipeline are arranged on the cover body. The compressed gas provided by the liquid-feeding gas supply device 9 pressurizes the suspension feeder 10 through the inlet pipeline, so that the suspension flows out from the liquid outlet pipeline based on the pressure. Further, a first decompression valve 17 is provided in front of the intake pipeline, and the first decompression valve 17 is used to control the pressure of the compressed gas. A flow meter 18 is provided behind the liquid outlet pipeline, and the flow meter 18 is used to observe the feeding rate.

In the embodiment shown in FIG. 1 , the cold air power spraying system for the suspension further includes an atomizing nozzle 11 , and the atomizing nozzle 11 is arranged between the suspension feeder 10 and the spray gun 4 . The atomizing nozzle 11 is provided with a gas inlet, a liquid inlet and an atomizing vapor outlet. The gas inlet is communicated with the gas outlet of the liquid feeding gas supply device 9 , the liquid inlet is communicated with the liquid outlet pipe of the suspension feeder 10 , and the atomizing steam outlet of the atomizing nozzle 11 is communicated with the liquid material input port of the spray gun 4 . The atomizing nozzle 11 atomizes the suspension into dispersed small droplets by gas-liquid mixing. By setting the atomizing nozzle 11, the suspension is atomized before being sent to the spray gun 4, and the suspension can be atomized into small dispersed droplets, thereby accelerating the evaporation of the suspension to ensure the spraying quality.

The gas inlet, liquid inlet and atomizing steam outlet of the atomizing nozzle are distributed in a "T" shape. Referring to FIG. 4 , further, a second pressure reducing valve 22 and a second flow meter 24 are provided between the gas inlet of the atomizing nozzle 11 and the gas outlet of the liquid feeding gas supply device 9 .

In the embodiment shown in FIG. 1, the suspension cold air power spraying system also includes a gas heating device 7, the control device is connected with the gas heating device 7, and the gas heating device 7 is provided between the main gas supply device 6 and the spray gun 4, the main The output port of the gas supply device 6 communicates with the input port of the gas heating device 7 , and the output port of the gas heating device 7 communicates with the main gas input port of the spray gun 4 .

In one embodiment, the gas heating device 7 includes a three-stage heater, wherein the first stage is a main heater, the second stage is an auxiliary heater, and the third stage is a heat preservation device. The main heater, the auxiliary heater and the heat preservation device are arranged in sequence. The main gas output from the main gas supply device 6 reaches the preset gas temperature through the main heater, the auxiliary heater and the heat preservation device in sequence. The gas reaching the preset temperature enters the main gas input port of the spray gun 4 through the pipeline. The three-stage heating ensures the efficiency and stability of the gas heating.

The above-mentioned suspension cold air power spraying system transports the powder material with liquid as the medium, disperses the suspension into atomized droplets through the atomizing nozzle 11, and carries the powder droplets into the spray gun 4 through the heating gas, where the Laval spray gun 4 After moderate acceleration, it is sprayed to the substrate, and finally deposited on the surface of the substrate to form a coating.

In the embodiment shown in FIG. 1, the suspension cooling air power spraying system further includes a water cooling device 8, the control device is connected to the water cooling device 8, and the water cooling device 8 includes a first water cooling circuit and a second water cooling circuit, the first water cooling The circuit communicates with the water cooling circuit of the spray gun 4 to form a first circulating cooling circuit. The second water cooling circuit communicates with the water cooling circuit of the gas heater 6 to form a second circulating cooling circuit.

In one embodiment, a water cooling circuit is provided outside the main heater, the auxiliary heater, and the heat preservation device, respectively, and the second water cooling circuit is respectively connected to the water cooling circuit of the main heater, the water cooling circuit of the auxiliary heater, and the heat preservation device. The water cooling circuit is connected.

The water cooling device 8 is used to cool the high temperature equipment in the suspension cold air power spraying system by water circulation, so as to ensure the continuous stability of the operation of the suspension cold air power spraying system.

In the embodiment shown in FIG. 1 , the suspension cold air dynamic spraying system further includes a sample stage 5 , the sample stage 5 is used to fix the sprayed substrate, and the spray gun 4 is used to spray the fixed substrate on the sample stage. The sample stage 5 is placed at a certain distance in front of the muzzle of the spray gun 4 .

In one embodiment, the sample stage 5 is capable of biaxial movement in a plane perpendicular to the spraying direction. That is, the sample stage 5 can move along the X axis and the Y axis of the plane coordinate system on a plane perpendicular to the spraying direction. The spray gun 4 can perform three-axis movement and three-axis rotation in space under the clamping of the manipulator 5. That is, the spray gun 4 can move along the X-axis, Y-axis and Z-axis of the earth coordinate system and rotate around the X-axis, Y-axis and Z-axis of its own coordinate system under the grip of the manipulator 5 . Therefore, the spray gun 4 and the sample stage 5 can be combined to achieve relative motion under eight degrees of freedom. During spraying, the spray gun 4 and the sample stage 5 can be converted in different directions and distances to meet the size contours of different substrates and the process flow. process requirements.

In the embodiment shown in FIG. 1 , the suspension cold air dynamic spraying system further includes a dust removal device 12 , and the dust removal device 12 is used to collect powder that is not deposited on the surface of the substrate after spraying.

In one embodiment, the dedusting device 12 includes two stages of dedusting. Specifically, the dust removal device 12 is installed below the sample stage 5 . The dust removal device 12 includes a two-stage dust collector. The first stage is a gravity separation dust collector, and the second stage is a filter cartridge dust collector. The gravity separation dust collector and the filter cartridge dust collector are connected in sequence. Gravity separation dust collector can use gravity to complete the primary screening of powder particles with larger particle size. The filter cartridge dust collector further sieves the powder particles with smaller particle size. Two-stage dust removal can reduce the impact of larger particles on the filter cartridge, prolong the service life of the filter cartridge, and can recover the residual powder particles roughly according to the powder particle size, which ensures the environmental protection of the spraying technology and facilitates the recovery of powder particles. Reuse.

In the embodiment shown in FIG. 1 , the control device includes a control panel 1 and a control cabinet 2 . The control panel 1 is connected with the control cabinet 2 through a circuit. The control panel 1 can set the process parameters and display the parameter changes in the spraying process in real time. The parameter settings on the control panel 1 are converted into electrical signals and input to the control cabinet 2, so as to realize the communication connection and control with each device. Specifically, the work instruction flow of the control device can be seen in FIG. 5 . The manipulator 3 , the main gas supply device 6 , the gas heating device 7 , the water cooling device 8 and the liquid feeding gas supply device 9 all realize data transmission and control with the control cabinet 2 through the circuit.

Please refer to Figure 6 at the same time, the working process of the suspension cold air power spraying system is as follows: First, set the process parameters through the control panel 1, including the main air pressure, main air temperature, suspension feeding pressure, spraying trajectory, water cooling temperature, etc., the setting is completed. Then start the system; then the control cabinet 2 recognizes the command and sends control signals to each device respectively, and each device starts operation immediately after receiving the signal; after the liquid gas supply device 9 is started, it starts to pressurize the suspension feeder 10 to transport the suspension, the suspension The liquid is mixed with the gas by the atomizing nozzle 11 and atomized into small droplets and then enters the spray gun 4; at the same time, the main gas supply device 6 starts to supply gas, and the main gas reaches the preset temperature after passing through the gas heating device 7 and also enters the spray gun 4; the atomized liquid After the droplets and the main gas are delivered to the spray gun 4, the manipulator 3 clamps the spray gun 4 to start working with the preset spraying trajectory, and the water cooling device 8 in spraying continues to perform water circulation cooling on the spray gun 4 and the gas heating device 7; until all the spraying tasks are completed. After that all devices stop working and are in standby state.

In addition, please refer to FIG. 7, the application of the suspension cold air dynamic spraying system in the coating preparation method is clarified, that is, the specific steps in which the suspension cold air dynamic spraying system is used to prepare the nanocoating layer are clarified, so the The preparation method of the coating specifically comprises the following steps:

S10, preparing the ultrafine powder to form a suspension.

In S10, the powder can be nano-scale powder or other particle size sub-micron-scale powder.

S20. Using the suspension cold air power spraying system and the cold air power spraying method, spray the powder particles carried by the suspension onto the surface of the substrate to form a coating on the surface of the substrate.

In S20, in the step of spraying the suspension on the surface of the substrate by means of cold air power spraying, the cold air power spraying system can be used for the cold air power spraying.

The preparation method of the above-mentioned nano-coating, by preparing ultra-fine powder particles to form a suspension, and then spraying by means of cold air dynamic spraying, the fluidity of the ultra-fine powder particles is effectively improved, and the deposition of higher particles in the cold spraying is guaranteed. efficiency, improving the quality of the coating.

The above-mentioned suspension cold air power spraying system has the following advantages:

(1) The preparation of nano-coatings by cold spraying technology can combine the technological advantages of cold spraying technology to ensure the consistency of the microstructure of the coating with the original nanomaterials, avoid the modification of materials during the spraying process, and maximize the The high bonding strength and low porosity of the nano-coating can be maintained to a certain extent.

(2) The suspension cold air power spraying system includes a suspension feeder 10 and an atomizing nozzle 11. By controlling the pressure and flow of the liquid feeding gas and the atomizing gas, the feeding speed and atomization effect of the suspension can be adjusted to improve the different Spraying process quality of nanomaterials.

(3) The suspension cold air dynamic spraying system supports eight-degree-of-freedom spatial position adjustment, which can realize the conversion of the direction and distance of the spray gun 4 relative to the sample stage 5 during spraying, and realize multi-angle and multi-directional spraying. The size profile of the material selects different technological processes.

(4) The suspension cold air power spraying system includes an independent water cooling device 8, which can perform water circulation cooling on high temperature devices such as the gas heating device 7 and the spray gun 4 in real time, improving the continuity of long-term spraying.

(5) The gas heating device 7 includes a three-stage gas heater, which improves the stability of the heating temperature of the main gas for spraying and ensures the stability of the spraying process.

(6) The dust removal device 12 includes a two-stage dust collector, which can recycle the residual powder particles by particle size, which ensures the environmental protection degree of the spraying technology and facilitates the recycling and reuse of the powder particles.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the present invention. the scope of protection of the invention.

Claims

A suspension cold air power spraying system is characterized in that it includes a control device, a spray gun device, a main gas supply device, a liquid supply gas supply device and a suspension feeder, and the spray gun device includes a spray gun;

the main gas supply device communicates with the main gas input port of the spray gun;

The liquid-feeding gas supply device is communicated with the suspension feeder;

The suspension feeder is communicated with the liquid material input port of the spray gun;

The spray gun device, the suspension feeder, the main gas supply device and the liquid supply gas supply device are respectively connected with the control device.
The cold air power spraying system for suspension liquid according to claim 1, wherein the main gas supply device comprises a liquid gas storage device, a vaporization device, a buffer device and a pressure regulating device which are connected in sequence, and the liquid gas storage device uses For storing liquefied gas, the vaporization device is used to vaporize the liquefied gas, the buffer device is used to store the vaporized high-pressure main gas, and the pressure regulating device is used to adjust the high-pressure main gas to preset pressure and constant pressure output.
The cold air power spraying system for suspension according to claim 1, wherein the main gas supply device provides main gas for the spray gun, and the main gas is at least one of nitrogen, helium and air.
The cold air power spraying system for suspension liquid according to claim 1, wherein the spray gun device further comprises a manipulator, the spray gun is fixed on the manipulator, and the control device is connected with the manipulator.
The cold air power spraying system for suspension liquid according to claim 4, wherein the manipulator can perform three-axis movement and three-axis rotation in space.
The cold air power spraying system for suspension liquid according to claim 1, wherein the spray gun comprises a Laval nozzle and a water cooling jacket, and the Laval nozzle is provided with the main gas input port and the liquid material Input port, the water cooling jacket wraps the outside of the Laval nozzle.
The suspension cold air power spraying system according to claim 1, wherein the suspension feeder is provided with an air inlet pipeline and a liquid outlet pipeline;

One end of the air intake pipeline is communicated with the liquid feeding gas supply device, and the other end of the air intake pipeline is arranged above the liquid level of the suspension in the suspension feeder;

One end of the liquid outlet pipeline is communicated with the liquid material input port of the spray gun, and the other end of the liquid outlet pipeline is arranged below the liquid level of the suspension in the suspension feeder.
The cold air power spraying system for suspension according to claim 1, further comprising an atomizing nozzle, wherein the atomizing nozzle is arranged between the suspension feeder and the spray gun, and the atomizing nozzle is arranged between the suspension feeder and the spray gun. There are gas inlet, liquid inlet and atomizing steam outlet, the gas inlet is communicated with the gas outlet of the liquid feeding gas supply device, the liquid inlet is communicated with the liquid outlet pipe of the suspension feeder, the atomization The atomizing vapor outlet of the nozzle communicates with the liquid material input port of the spray gun.
The cold air power spraying system for suspension liquid according to claim 1, characterized in that, it further comprises a gas heating device, the control device is connected with the gas heating device, and the gas heating device is provided on the main gas supply device and the main gas supply device and the gas heating device. Between the spray guns, the output port of the main gas supply device communicates with the input port of the gas heating device, and the output port of the gas heating device communicates with the main gas input port of the spray gun.
The cold air power spraying system for suspension liquid according to claim 9, wherein the gas heating device comprises a main heater, an auxiliary heater and a heat preservation device arranged in sequence, and the main gas output from the main gas supply device passes through in sequence The main heater, the auxiliary heater and the temperature keeping device reach a preset gas temperature.
The suspension cooling air power spraying system according to claim 10, further comprising a water cooling device, the control device is connected to the water cooling device, and the water cooling device comprises a first water cooling circuit and a second water cooling circuit a circuit, the first water cooling circuit is communicated with the water cooling circuit of the spray gun to form a first circulating cooling circuit;

The second water cooling circuit is communicated with the water cooling circuit of the gas heater to form a second circulating cooling circuit.
The cold air power spraying system for suspension liquid according to claim 11, wherein the main heater, the auxiliary heater and the outside of the heat preservation device are respectively provided with water cooling circuits, and the second water cooling circuits are respectively provided with water cooling circuits. It communicates with the water cooling circuit of the main heater, the water cooling circuit of the auxiliary heater and the water cooling circuit of the heat preservation device.
The cold air power spraying system for suspension according to claim 1, further comprising a sample stage, the sample stage is used for fixing the spraying substrate, and the spray gun is used for spraying the spraying fixed on the sample stage The substrate is sprayed.
The cold air dynamic spraying system of suspension liquid according to claim 13, characterized in that, the sample stage can perform biaxial movement on a plane perpendicular to the spraying direction.
The suspension cold air dynamic spraying system according to claim 13, further comprising a dust removal device, the dust removal device is used to collect the powder that is not deposited after spraying.
The suspension cold air dynamic spraying system according to claim 15, wherein the dust removal device comprises a gravity separation dust collector and a filter cartridge dust collector connected in sequence.
The application of the suspension cold air dynamic spraying system as claimed in any one of claims 1-16 in the preparation method of the coating, wherein the preparation method of the coating comprises the following steps:

The powder with poor flowability is prepared to form a suspension;

Using the suspension cold air power spraying system and the cold air power spraying method, the suspension is sprayed on the surface of the substrate to form a coating on the surface of the substrate.