Supersonic spraying equipment

Abstract

The utility model relates to the technical field of spraying equipment, in particular to supersonic spraying equipment. The equipment comprises a box body, an oil-water separator, a powder feeder, a bidirectional silicon controlled rectifier and a direct current source are arranged in the box body, a power interface, an air switch and a temperature control meter are arranged on the box body, the air inlet end of the oil-water separator is connected with an air source, the air outlet end of the oil-water separator is connected with a spray gun, the powder feeder is connected with the spray gun, and the power interface is connected with the air switch. The air switch is electrically connected with the bidirectional silicon controlled rectifier, the temperature control meter and the direct current source, the temperature control meter is electrically connected with the bidirectional silicon controlled rectifier, the bidirectional silicon controlled rectifier is electrically connected with the heating wire, the heating wire is arranged in the spray gun, and a thermocouple is arranged on the spray gun and electrically connected with the temperature control meter. The heating temperature of the spray gun can be controlled through the temperature control meter, the thermocouple and the bidirectional silicon controlled rectifier, it is guaranteed that sprayed airflow reaches the preset temperature, the spraying effect is improved, the oil-water separator can reduce the content of water in compressed air, and the service life of the heating wire is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying equipment, in particular to supersonic spraying equipment. Background Art

[0002] Over time, workpieces wear out their surfaces, and replacing them with new ones can easily lead to a waste of resources. Repairing these worn parts, especially large ones that are difficult to disassemble and transport, is crucial for on-site repair, saving costs and achieving high economic benefits. Thermal spraying has traditionally been used, but this method requires harsh conditions, high temperatures, and is expensive. Furthermore, the outermost layer of the coating can have transverse cracks and poor density.

[0003] Cold spraying technology is a new material surface modification technology that is easy to operate, safe and pollution-free. Cold spraying refers to the process of using supersonic gas and solid two-phase airflow to shoot coating powder onto a substrate to form a dense coating at room temperature or a lower temperature. Therefore, there is no high-temperature heating of coating material powder particles in cold spraying technology, and there is no high-temperature oxidation, gasification, melting, crystallization and other effects that affect the performance of the coating. It can produce corrosion-resistant, friction-resistant, reinforcing, insulating, conductive and magnetic coatings on the surface of metal, glass and ceramic workpieces. In cold spraying technology, the spraying gas pressure and spraying gas temperature are the core process parameters. Constant gas pressure and temperature determine the implementation effect of the cold spraying process. Therefore, we need to control them at a constant value to meet the spraying requirements, thereby improving the cold spraying effect of the powder particles.

[0004] Chinese patent application number 202321672501.5 discloses a cold spray integrated control cabinet, which includes a controller and a cabinet, a spray gun for metal powder spraying, a gas control module and a powder feeder arranged on the cabinet, the gas control module is electrically connected to the controller, the gas control module has a gas input interface and a gas output interface, the gas input interface is connected to the gas source, the gas output interface of the gas control module is connected to the spray gun and the powder feeder respectively, the controller can adjust the gas pressure flowing to the spray gun and the powder feeder in real time according to the pressure value of the gas flowing to the spray gun and the powder feeder, wherein the powder feeder includes a powder feeding tank and a discharge component, the discharge component includes a shell of a hollow cylindrical structure, the powder feeding tank is located above the shell, and the powder outlet is located in the powder feeding tank. Below, the powder feeding tank is connected to the interior of the shell through the powder outlet, and a feeding cavity is provided in the discharge component, and the feeding cavity is located inside the shell. A feeding disk is rotatably arranged in the shell, and a plurality of feeding troughs distributed around the center of the feeding disk are opened on the feeding disk. The motor drives the feeding disk to rotate, so that the feeding cavity can be moved to correspond to the discharge port or the air path. The feeding disk drives the several feeding cavities on it to move, so that the feeding cavity corresponds to the discharge port or the air path. When the feeding cavity corresponds to the powder outlet, the metal powder in the powder feeding tank can enter the feeding cavity. When the feeding cavity with metal powder moves to correspond to the air path, the flowing gas drives the metal powder in the feeding cavity to flow out from the gas output interface through the air path, and the gas output interface is connected to the spray gun pipeline.

[0005] The above-mentioned cold spray integrated control cabinet can monitor the pressure value of the gas flowing to the spray gun and adjust it in real time. However, in this process, the gas flowing to the spray gun may carry water vapor, thereby reducing the service life of the spray gun. At the same time, it does not have the function of monitoring the gas temperature in the spray gun, which will not only affect the spraying effect, but also reduce the service life of the spray gun if the temperature is too high. In addition, its powder feeder has a complex structure and a high production cost, which is not conducive to popularization and use. For ultrafine powder, its powder particle size is small, easy to agglomerate, and has poor fluidity. In the actual powder feeding process, it is easy to have unstable powder feeding and blockage, which affects the spraying quality. Utility Model Content

[0006] The purpose of the utility model is to solve the technical problems that the powder feeder in the existing cold spray integrated control cabinet has a complex structure, high production cost, and is prone to unstable powder feeding and clogging for ultrafine powder, which affects the spraying quality. The utility model provides a supersonic spraying equipment. By setting a temperature control meter and a thermocouple, the heating temperature in the spray gun can be better monitored, the service life of the spray gun can be increased, and the air flow ejected from the nozzle can be ensured to reach a preset temperature, thereby improving the spraying effect and spraying quality. The oil-water separator can reduce the water content in the compressed air and improve the heating efficiency.

[0007] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a supersonic spraying equipment, including a box body, an oil-water separator, a powder feeder, a bidirectional thyristor and a DC source are arranged in the box body, a power supply interface, an air switch and a temperature control meter are arranged on the box body, the air inlet end of the oil-water separator is connected to the air source through a pipeline, the air outlet end of the oil-water separator is connected to the spray gun through a pipeline, the powder feeder is connected to the spray gun through a pipeline, the power supply interface is connected to the air switch, the air switch is electrically connected to the bidirectional thyristor, the temperature control meter and the DC source respectively through a contactor, the temperature control meter is electrically connected to the bidirectional thyristor, the bidirectional thyristor is also electrically connected to the heating wire, the heating wire is arranged in the spray gun, a thermocouple is arranged on the spray gun, and the thermocouple is electrically connected to the temperature control meter.

[0008] Furthermore, a powder feeding port is provided at the upper end of the powder feeder, a powder bin is provided in the powder feeder, an opening is provided at the bottom of the powder bin, a shaft sleeve is provided at the lower end of the powder bin, a through hole is provided on the shaft sleeve opposite to the opening and passing through the shaft sleeve above and below, a powder feeding motor is provided at the upper end of the powder feeder, the powder feeding motor is electrically connected to the DC source, the output shaft of the powder feeding motor is connected to the stirring shaft through a coupling, the lower end of the stirring shaft passes through the bottom opening of the powder bin and extends into the through hole of the shaft sleeve and fits in the gap of the through hole, the part of the stirring shaft located in the through hole is provided with an external thread, a funnel is provided at the lower end of the shaft sleeve, the lower end of the funnel extends out of the powder feeder and is connected to the powder outlet interface through a pipeline, the powder outlet interface is connected to the spray gun through a pipeline, and the powder outlet interface is provided on the box body.

[0009] Furthermore, a speed regulating knob is provided on the box body, and the speed regulating knob is electrically connected to the powder feeding motor.

[0010] Furthermore, a material detector is provided on the powder bin, and the material detector is electrically connected to an alarm indicator light, and the alarm indicator light is provided on the box body.

[0011] Furthermore, a vibration motor is installed on the powder bin, and the vibration motor is electrically connected to a DC source.

[0012] Furthermore, the spray gun includes a shell, a Laval nozzle is provided at the front end of the shell, a powder inlet is provided on the Laval nozzle, the powder inlet is connected to the powder feeder through a pipeline, a nozzle is provided at the front end of the Laval nozzle, a sealing flange is provided inside the shell, a sealing air pipe is connected to one side of the sealing flange, the sealing air pipe is communicated with the Laval nozzle, an insulation layer is provided between the sealing air pipe and the shell, a ceramic body is provided in the sealing air pipe, a plurality of through grooves facing the Laval nozzle are provided on the ceramic body along its longitudinal direction, a heating wire is passed through the through groove, an air inlet pipe is passed through the sealing flange, one end of the air inlet pipe extends into the sealing air pipe, the other end of the air inlet pipe passes through the shell and extends to the outside of the spray gun and is connected to the air outlet end of the oil-water separator through a pipeline, a pressure switch is provided on the air inlet pipe, the pressure switch is provided in the shell, and a powder spraying switch is also provided at the rear end of the spray gun, and the powder spraying switch is electrically connected to the powder feeding motor.

[0013] Furthermore, the spray gun is also provided with a heating control switch, and the heating control switch is electrically connected to the bidirectional thyristor and the temperature control meter respectively.

[0014] Furthermore, the spraying equipment also includes a current measuring device, which includes an ammeter and a current transformer. The ammeter is arranged on the box body and is connected to the air switch through a contactor. The current transformer is arranged on the wire connecting the bidirectional thyristor and the heating wire.

[0015] Furthermore, the box body is also provided with a pressure gauge, an air inlet interface and an air outlet interface, one end of the air inlet interface is connected to the air source, and the other end of the air inlet interface is connected to the pressure gauge and the air inlet end of the oil-water separator through pipelines, the air outlet end of the oil-water separator is connected to one end of the air outlet interface, and the other end of the air outlet interface is connected to the spray gun through a pipeline.

[0016] Furthermore, a start switch and a stop switch are also provided on the box body, and the start switch and the stop switch are connected in series and electrically connected to the air switch.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The utility model provides a supersonic spraying device, which can better monitor the heating temperature in the spray gun by setting a temperature control meter and a thermocouple. The cooperation of the bidirectional thyristor and the spray gun heating control switch can better ensure that the airflow ejected from the nozzle reaches the preset temperature, thereby improving the spraying effect and spraying quality. The oil-water separator is used to separate water and gas, reduce the water content in the compressed air, increase the service life of the heating wire, improve the heating efficiency in the spray gun, and ensure the spraying quality. The equipment has the characteristics of high integration, good stability, and wide applicability.

[0019] (2) The utility model relates to a supersonic spraying device, in which a powder feeding motor in a powder feeder drives a stirring shaft to rotate to stir the powder particles in a powder bin. The external thread structure at the lower end of the stirring shaft ensures continuous and stable powder feeding. The speed regulating knob can adjust the powder feeding amount, thereby ensuring stable spraying quality. The utility model has a simple structure, is easy to manufacture and has low cost.

[0020] (3) The utility model provides a supersonic spraying device, in which a material detector is provided on the powder bin of the powder feeder, and an alarm indicator light is provided on the box body. The material detector and the alarm indicator light can better prompt the replenishment of powder.

[0021] (4) The utility model provides a supersonic spraying device, in which a vibration motor is installed on the powder bin of the powder feeder, which can vibrate the powder attached to the powder bin to ensure that the inner wall of the powder bin can be cleaned by vibration while the powder is being fed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the supersonic spraying equipment of this utility model Figure 1 .

[0023] Figure 2 The structure of the supersonic spraying equipment of this utility model Figure 2 .

[0024] Figure 3 This is a schematic diagram of the internal structure of the powder feeder of the supersonic spraying equipment of the present utility model.

[0025] Figure 4 This is a schematic diagram of the internal structure of the spray gun of the supersonic spraying equipment of the present invention.

[0026] In the figure: 1. Box body, 2. Box door, 3. Support leg, 4. Roller, 5. Pillar, 6. Handle, 7. Partition, 8. Oil-water separator, 9. Powder feeder, 901. Powder bin, 902. Powder bin support, 903. Bushing, 904. Tightening nut, 905. Funnel support, 906. Funnel, 907. Powder feed motor, 908. Powder feed motor output shaft, 909. Coupling, 910. Stirring shaft, 911. Material detector, 912. Vibration motor, 10. Contactor, 11. DC power source, 12. Bidirectional thyristor, 13. First fuse, 14. Second fuse, 15. Third fuse, 16. Air switch, 17. Power interface, 18. Spray gun control interface, 19 .Thermocouple interface, 20. Spray gun heating interface, 21. Pressure gauge, 22. Air inlet interface, 23. Air outlet interface, 24. Powder outlet interface, 25. Start switch, 26. Stop switch, 27. Temperature controller, 28. Ammeter, 29. Speed control knob, 30. Alarm indicator light, 31. Spray gun, 3101. Housing, 3102. Laval nozzle, 3103. Powder inlet, 3104. Nozzle, 3105. Sealing flange, 3106. Sealing air pipe, 3107. Insulation layer, 3108. Ceramic body, 3109. Through slot, 3110. Heating wire, 3111. Air inlet pipe, 3112. Pressure switch, 3113. Powder spray switch, 3114. Heating control switch. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the specific embodiments.

[0028] like Figure 1-4 The supersonic spraying equipment shown includes a box body 1, two supporting legs 3 are provided on one side of the bottom of the box body 1, two rollers 4 are provided on the other side of the bottom of the box body 1, two pillars 5 are provided on one side of the upper end of the box body 1, and the pillars 5 and the rollers 4 are located on the same side, and a handle 6 is provided on the top of the box body 1, and the handle 6 is provided close to one side of the pillar 5. By arranging the rollers 4, the pillars 5 and the handle 6, the spraying equipment can be conveniently moved.

[0029] The front and rear sides of the box body 1 are respectively provided with a box door 2, and a partition 7 is provided in the box body 1. The partition 7 divides the box body 1 into two front and rear storage spaces. An oil-water separator 8 and a powder feeder 9 are provided in one of the storage spaces, and a contactor 10, a DC source 11, a bidirectional thyristor 12, a first fuse 13, a second fuse 14 and a third fuse 15 are provided in the other storage space. The setting of the partition 7 and the box door 2 can facilitate the connection of various components and the arrangement of wires, and also facilitate the maintenance of the components.

[0030] One end of the box body 1 is provided with an air switch 16, a power interface 17, a spray gun control interface 18, a thermocouple interface 19, a spray gun heating interface 20, a pressure gauge 21, an air inlet interface 22, an air outlet interface 23 and a powder outlet interface 24, among which the power interface 17, the spray gun control interface 18, the thermocouple interface 19 and the spray gun heating interface 20 all adopt aviation plug connectors, which are convenient for plugging and unplugging and easy to operate; the upper end of the box body 1 is provided with a start switch 25, a stop switch 26 and a temperature control meter 27, the air switch 16 is connected to the 220V AC power supply through the power interface 17, and is used to power the spray equipment. The start switch 25 and the stop switch 26 are connected in series and electrically connected to the air switch 16 through the first fuse 13, and the start-stop switch is used for powering on and off the spray equipment.

[0031] The air switch 16 is electrically connected to the DC source 11, the bidirectional thyristor 12 and the temperature controller 27 through the contactor 10, respectively. A second fuse 13 is connected in series between the contactor 10 and the bidirectional thyristor 12, and a third fuse 15 is connected in series between the contactor 10 and the temperature controller 27. The first control end of the bidirectional thyristor 12 is electrically connected to the first signal output end of the temperature controller 27, the second control end of the bidirectional thyristor 12 and the second signal output end of the temperature controller 27 are electrically connected to the heating control switch 3114 through the spray gun control interface 18, and the heating control switch 3114 is provided on the spray gun 31. The main output end of the bidirectional thyristor 12 and the power supply end of the temperature controller 27 are electrically connected to the heating wire 3110 through the spray gun heating interface 20. The heating wire 3110 is provided in the spray gun 31. A thermocouple (not shown in the figure) is provided on the spray gun 31, and the thermocouple is electrically connected to the temperature controller 27 through the thermocouple interface 19.

[0032] The spraying equipment also includes a current measuring device, which includes an ammeter 28 and a current transformer. The ammeter 28 is arranged at the upper end of the box 1. The ammeter 28 is connected to the air switch 16 through the contactor 10. The current transformer is mounted on the wire connecting the bidirectional thyristor 12 and the heating wire 3110. The current transformer is located inside the box 1. During the heating process, the current during heating is detected by the current transformer.

[0033] One end of the air inlet interface 22 is connected to the air source, and the other end of the air inlet interface 22 is connected to the pressure gauge 21 and the air inlet end of the oil-water separator 8 through pipelines. The air outlet end of the oil-water separator 8 is connected to one end of the air outlet interface 23, and the other end of the air outlet interface 23 is connected to the spray gun 31 through a pipeline. The oil-water separator 8 is used to separate water and gas, reduce the water content in the compressed air, better dry the compressed gas, increase the service life of the spray gun, and improve the heating efficiency in the spray gun.

[0034] A powder feeding port is provided at the upper end of the powder feeder 9, a powder bin 901 is provided in the powder feeder 9 through a powder bin support 902, an opening is provided at the bottom of the powder bin 901, a shaft sleeve 903 is provided at the lower end of the powder bin 901, the shaft sleeve 903 is screwed and fixed to the powder bin support 902 by tightening the nut 904, a through hole is provided on the shaft sleeve 903 which is opposite to the opening of the powder bin 901 and passes through the shaft sleeve above and below, a powder feeding motor 907 is provided at the upper end of the powder feeder 9, the powder feeding motor 907 is electrically connected to the DC source 11, the output shaft 908 of the powder feeding motor is connected to the stirring shaft 910 through a coupling 909, and the lower end of the stirring shaft 910 passes through the bottom opening of the powder bin 901 and extends into the through hole of the shaft sleeve 903 and In coordination with the clearance of the through hole, the part of the stirring shaft 910 located in the through hole is provided with an external thread, and the lower end of the powder feeder 9 is provided with a funnel 906 through the funnel holder 905. The funnel 906 is located below the shaft sleeve 903 and is aligned with the through hole of the shaft sleeve 903. The lower end of the funnel 906 extends out of the powder feeder 9 and is connected to the powder outlet interface 24 through a pipeline. The powder outlet interface 24 is connected to the spray gun 31 through a pipeline. By providing an external thread structure at the lower end of the stirring shaft 910, the powder can be effectively pushed to fall into the funnel 906 at the lower end of the powder feeder 9, thereby ensuring continuous and stable powder feeding, and then ensuring stable spraying quality. It has a simple structure, is easy to manufacture, has a low cost, and is easy to promote and use.

[0035] Preferably, a speed regulating knob 29 is also provided on the top of the box body 1, and the speed regulating knob 29 is electrically connected to the powder feeding motor 907. By setting the speed regulating knob 29, the amount of powder feeding can be adjusted to ensure high-precision control of the powder feeding amount to better meet the needs of spraying.

[0036] Preferably, a material detector 911 is provided on the powder bin 901, and the material detector 911 is electrically connected to the alarm indicator light 30, and the alarm indicator light 30 is provided on the upper side of the box body 1. By providing the material detector 911 and the alarm indicator light 30, it is possible to better prompt to replenish the powder.

[0037] Preferably, a vibration motor 912 is installed on the powder bin 901, and the vibration motor 912 is electrically connected to the DC source 11. By setting the vibration motor 912, the powder attached to the powder bin 901 can be vibrated off, ensuring that the inner wall of the powder bin 801 can be vibrated and cleaned while the powder is being delivered.

[0038] The spray gun 31 includes a shell 3101, a Laval nozzle 3102 is provided at the front end of the shell 3101, a powder inlet 3103 is provided on the Laval nozzle 3102, the powder inlet 3103 is connected to the powder outlet interface 24 through a pipeline, a nozzle 3104 is provided at the front end of the Laval nozzle 3102, a sealing flange 3105 is provided inside the shell 3101, a sealing air pipe 3106 is connected to one side of the sealing flange 3105, the sealing air pipe 3106 is connected to the Laval nozzle 3102, an insulation layer 3107 is provided between the sealing air pipe 3106 and the shell 3101, a ceramic body 3108 is provided in the sealing air pipe 3106, a plurality of through grooves 3109 facing the Laval nozzle 3102 are provided on the ceramic body 3107 along its longitudinal direction, and a heating Wire 3110, an air inlet pipe 3111 is passed through the sealing flange 3105, one end of the air inlet pipe 3111 extends into the sealing air pipe 3106, and the other end of the air inlet pipe 3111 passes through the shell 3101 and extends to the outside of the spray gun 31 and is connected to the air outlet interface 23 through a pipeline. A pressure switch 3112 is also provided on the air inlet pipe 3111, and the pressure switch 3112 is located in the shell 3101. A powder spraying switch 3113 is also provided at the rear end of the spray gun 31, and the powder spraying switch 3113 is electrically connected to the powder feeding motor 907. After the pressure switch 3112 is actuated, the compressed gas is heated through the heating wire 3110, which can ensure ventilation before heating, thereby increasing the service life of the heating wire 3110. When the heating temperature reaches the set value, the powder spraying switch 3113 can be turned on to start the powder spraying operation.

[0039] The working principle of the supersonic spraying equipment of the present invention is as follows: the powder to be sprayed is added into the powder bin 901 through the powder adding port, the air source is connected to the air inlet interface 22, the air outlet interface 23 is connected to the spray gun 31, the powder outlet interface 24 is connected to the spray gun 31, the spray gun heating control switch 3114 is connected to the spray gun control interface 18 via an electric wire, the thermocouple is connected to the thermocouple interface 19 via an electric wire, the spray gun heating wire 3110 is connected to the spray gun heating interface 20 via an electric wire, the start switch 25 is turned on, the spraying temperature is set on the temperature control meter 27, the air source is turned on, the spray gun 31 starts to ventilate, the pressure gauge 21 can monitor the gas pressure value flowing to the spray gun 31, and the gas pressure flowing to the spray gun 31 can be adjusted in real time according to the pressure value to meet the spraying process requirements, after the pressure switch 3112 in the spray gun 31 is actuated, the spray gun heating control switch 3114 is turned on. 114, the heating wire 3110 is heated. After it is heated to the set temperature, the powder spraying switch 3113 is turned on, and the powder feeding motor 907 is started. The powder feeding motor 907 drives the stirring shaft 910 to rotate to achieve stirring of the powder particles in the powder bin 901. The threaded structure at the lower end of the stirring shaft 910 can smoothly push the powder into the funnel 906, and the powder is transported to the spray gun 31 through the pipeline. The powder feeding amount can be controlled by adjusting the speed control knob 29. The powder amount in the powder bin 901 is detected by the level detector 911. When the powder reaches the set value, the alarm indicator light 30 lights up to prompt the replenishment of powder. During the spraying process, the thermocouple detects the temperature in the spray gun 31 and compares it with the set value of the temperature control meter 27, so as to realize real-time adjustment of the spraying temperature to meet the spraying process requirements and improve the spraying quality. After the spraying is completed, the equipment is turned off by the stop switch 26.

[0040] The utility model relates to a supersonic spraying device. By arranging a temperature control meter and a thermocouple, the heating temperature in the spray gun can be better monitored. By cooperating with a bidirectional thyristor and a spray gun heating control switch, the air flow ejected from the nozzle can be better guaranteed to reach a preset temperature, thereby improving the spraying effect and spraying quality. The oil-water separator is used to separate water and gas, reduce the water content in the compressed air, increase the service life of the spray gun, and at the same time improve the heating efficiency in the spray gun. The device has the characteristics of high integration, good stability, and wide applicability.

[0041] The above content is a further detailed description of the present invention in conjunction with the preferred technical solution, and the specific implementation of the present invention cannot be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered as within the scope of protection of the present invention.

Claims

1. A supersonic spraying device, characterized in that: It includes a box body, in which an oil-water separator, a powder feeder, a bidirectional thyristor and a DC source are arranged, and a power supply interface, an air switch and a temperature controller are arranged on the box body. The air inlet end of the oil-water separator is connected to the air source through a pipeline, and the air outlet end of the oil-water separator is connected to the spray gun through a pipeline. The powder feeder is connected to the spray gun through a pipeline, the power supply interface is connected to the air switch, and the air switch is electrically connected to the bidirectional thyristor, the temperature controller and the DC source respectively through a contactor. The temperature controller is electrically connected to the bidirectional thyristor, and the bidirectional thyristor is also electrically connected to the heating wire. The heating wire is arranged in the spray gun, and a thermocouple is arranged on the spray gun, and the thermocouple is electrically connected to the temperature controller.

2. A supersonic spraying equipment according to claim 1, characterized in that: The upper end of the powder feeder is provided with a powder feeding port, a powder bin is provided in the powder feeder, the bottom of the powder bin is provided with an opening, the lower end sleeve of the powder bin is provided with a shaft sleeve, and the shaft sleeve is provided with a through hole opposite to the opening and passing through the shaft sleeve above and below. The upper end of the powder feeder is provided with a powder feeding motor, the powder feeding motor is electrically connected to the DC source, the output shaft of the powder feeding motor is connected to the stirring shaft through a coupling, the lower end of the stirring shaft passes through the bottom opening of the powder bin and extends into the through hole of the shaft sleeve and fits in the gap of the through hole, the part of the stirring shaft located in the through hole is provided with an external thread, and the lower end of the shaft sleeve is provided with a funnel, the lower end of the funnel extends out of the powder feeder and is connected to the powder outlet interface through a pipeline, the powder outlet interface is connected to the spray gun through a pipeline, and the powder outlet interface is provided on the box body.

3. The supersonic spraying equipment according to claim 2, characterized in that: The box body is also provided with a speed regulating knob, and the speed regulating knob is electrically connected to the powder feeding motor.

4. The supersonic spraying equipment according to claim 2, characterized in that: The powder bin is provided with a material detector, and the material detector is electrically connected to an alarm indicator light, and the alarm indicator light is provided on the box body.

5. The supersonic spraying equipment according to claim 2, characterized in that: A vibration motor is installed on the powder bin, and the vibration motor is electrically connected to a DC source.

6. The supersonic spraying equipment according to claim 2, characterized in that: The spray gun includes a shell, a Laval nozzle is provided at the front end of the shell, a powder inlet is provided on the Laval nozzle, the powder inlet is connected to the powder feeder through a pipeline, a nozzle is provided at the front end of the Laval nozzle, a sealing flange is provided inside the shell, a sealing air pipe is connected to one side of the sealing flange, the sealing air pipe is communicated with the Laval nozzle, an insulation layer is provided between the sealing air pipe and the shell, a ceramic body is provided in the sealing air pipe, a plurality of through grooves facing the Laval nozzle are provided on the ceramic body along its longitudinal direction, a heating wire is passed through the through groove, an air inlet pipe is passed through the sealing flange, one end of the air inlet pipe extends into the sealing air pipe, the other end of the air inlet pipe passes through the shell and extends to the outside of the spray gun and is connected to the air outlet end of the oil-water separator through a pipeline, a pressure switch is provided on the air inlet pipe, the pressure switch is provided in the shell, a powder spraying switch is also provided at the rear end of the spray gun, and the powder spraying switch is electrically connected to the powder feeding motor.

7. The supersonic spraying equipment according to claim 1, characterized in that: The spray gun is also provided with a heating control switch, which is electrically connected to the bidirectional thyristor and the temperature control meter respectively.

8. The supersonic spraying equipment according to claim 1, characterized in that: The spraying equipment also includes a current measuring device, which includes an ammeter and a current transformer. The ammeter is arranged on the box and connected to the air switch through a contactor. The current transformer is arranged on the wire connecting the bidirectional thyristor and the heating wire.

9. The supersonic spraying equipment according to claim 1, characterized in that: The box body is also provided with a pressure gauge, an air inlet interface and an air outlet interface. One end of the air inlet interface is connected to the air source, and the other end of the air inlet interface is connected to the pressure gauge and the air inlet end of the oil-water separator through pipelines. The air outlet end of the oil-water separator is connected to one end of the air outlet interface, and the other end of the air outlet interface is connected to the spray gun through a pipeline.

10. The supersonic spraying equipment according to claim 1, characterized in that: The box body is also provided with a start switch and a stop switch, which are connected in series and electrically connected to the air switch.

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