CN213194179U

CN213194179U - Electrostatic powder spray gun

Info

Publication number: CN213194179U
Application number: CN202021813308.5U
Authority: CN
Inventors: 马永明; 张麟
Original assignee: Shanghai Spring Corp ltd
Current assignee: Shanghai Spring Corp ltd; China Spring Corp Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-05-14
Anticipated expiration: 2030-08-26

Abstract

An electrostatic powder spraying gun comprises a spray gun body, an electrostatic enhancement device, an electrostatic enhancement controller, a guide pipe and a powder enhancement spray head. The static enhancement device comprises a conductive liquid storage tank, an atomizing pump, a pressure maintaining container, a booster pump and a pressure sensor; the conductive liquid storage tank, the atomizing pump, the pressure maintaining container and the booster pump are sequentially connected, and the pressure sensor is used for detecting the pressure of the aerial fog in the pressure maintaining container. The powder enhancing nozzle is connected with the front end of the spray gun body and is provided with a central through hole, the hole wall of the central through hole is provided with an aerial fog outlet hole, the outer side surface of the powder enhancing nozzle is provided with an aerial fog inlet, and the aerial fog inlet is communicated with the aerial fog outlet hole; one end of the conduit is communicated with the outlet of the booster pump, and the other end of the conduit is communicated with the aerial fog inlet. The static enhancement controller is connected with the output end of the pressure sensor and is used for respectively controlling the starting and stopping of the atomizing pump and the booster pump. The utility model discloses can increase the thickness of the coating of spraying on the work piece to make the coating thickness more even.

Description

Electrostatic powder spray gun

Technical Field

The utility model relates to a spray gun for dusting.

Background

The traditional electrostatic powder spraying gun utilizes high voltage static to ionize air around a spray gun discharge needle, when powder coating passes through an ionized air area, powder is charged with static electricity, and in an electric field formed by high voltage of the spray gun and a grounded workpiece, the charged powder is adsorbed to the surface of the workpiece under the action of electric field force and compressed air thrust. However, the electrostatic powder adsorption mode has a disadvantage that in the regions of the inner wall, the inner side, the inner cavity and the like with weak electric field of the workpiece, the regions are not easy to adsorb powder during electrostatic spraying due to weak electrostatic shielding electric field and poor powder adsorption capacity, the thickness of the sprayed coating is thin, and finally the workpiece coating is extremely uneven, which not only does not play a good role in corrosion protection, but also wastes more powder.

Disclosure of Invention

The utility model aims to solve the technical problem that a hand-held type electrostatic powder spray gun is provided, it can increase the thickness of the coating of spraying on the work piece to make the coating thickness more even.

The embodiment of the utility model provides an electrostatic powder gun, which comprises a spray gun body; the electrostatic powder gun also comprises an electrostatic enhancement device, an electrostatic enhancement controller, a guide pipe and a powder enhancement spray head; the static enhancement device comprises a conductive liquid storage tank, an atomizing pump, a pressure maintaining container, a booster pump and a pressure sensor; the conductive liquid storage tank, the atomizing pump, the pressure maintaining container and the booster pump are sequentially connected, and the pressure sensor is used for detecting the pressure of the aerial fog in the pressure maintaining container; the powder enhancing nozzle is connected with the front end of the spray gun body and is provided with a central through hole, the hole wall of the central through hole is provided with an aerial fog outlet hole, the outer side surface of the powder enhancing nozzle is provided with an aerial fog inlet, and the aerial fog inlet is communicated with the aerial fog outlet hole; one end of the guide pipe is communicated with the outlet of the booster pump, and the other end of the guide pipe is communicated with the aerial fog inlet; and a first signal input end of the static enhancement controller is connected with an output end of the pressure sensor, and the static enhancement controller is used for respectively controlling the starting and stopping of the atomizing pump and the booster pump.

The utility model discloses at least, have following advantage:

1. the static enhancement device provided by the embodiment of the utility model can apply the conducting liquid aerial fog around the outlet of the spray gun body, so that the humidity around the outlet of the spray gun body is increased, the air ionization effect around the discharge needle of the spray gun is better, the powder electrification effect is enhanced, and the thickness of a coating sprayed on a workpiece can be increased;

2. the utility model discloses electrostatic powder gun is owing to adopted static reinforcing means, can effectively reduce the spray gun and set up voltage and electrostatic field intensity, reaches the effect that effectively weakens electrostatic shielding, and the coating thickness that makes on spraying the work piece is more even.

Drawings

Fig. 1 shows a schematic view of the overall structure of an electrostatic powder gun according to an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a static electricity enhancing apparatus according to an embodiment of the present invention.

Fig. 3 shows an electrical control schematic diagram of a static-enhancement controller according to an embodiment of the present invention.

Detailed Description

The electrostatic powder spraying process mainly comprises two steps of spray gun discharging and powder adsorption of charged particles. Firstly, ionizing air around a discharge needle by a spray gun to charge molecules in the air; then, the powder adsorbs the charged particles when passing through the charged particle region, the powder is charged, and the powder is adsorbed on the surface of the workpiece and then discharged, and the powder is prevented from being electrostatically discharged after being adsorbed to a certain thickness, so that the adsorption effect gradually weakens, and the thickness is maintained substantially constant. Researches show that a certain humidity environment is maintained around the spray gun, the air ionization effect is better, the powder charging effect is better, the powder feeding rate of the powder can be obviously improved, and the coating thickness is improved.

Please refer to fig. 1 to fig. 3. According to the utility model discloses electrostatic powder gun, including the spray gun rifle body 1, static reinforcing means 2, static reinforcing controller 3, pipe 4 and powder reinforcing shower nozzle 5.

The spray gun body 1 is provided with an electrostatic generator (not shown) and a discharge needle 12, and the discharge needle 12 is provided near the tip of the spray gun body 1. The trigger 6 can control the static electricity generator to work, so that high-voltage static electricity is generated around the discharge needle 12. The powder supply barrel 71 delivers powder, which is charged with high-voltage static electricity, around the discharge needles 12 through the powder delivery tube 72.

The static electricity enhancing apparatus 2 includes a casing 20, a conductive liquid tank 21, an atomizing pump 22, a holding pressure vessel 23, a pressurizing pump 24, a pressure sensor 25, a temperature sensor 26, an electric heating element 271, and a heating element energizing switch 272. The conductive liquid storage tank 21, the atomizing pump 22, the pressure maintaining container 23, the pressurizing pump 24, the pressure sensor 25, the temperature sensor 26, the electric heating element 271 and the heating element energizing switch 272 are all arranged in the housing 20, the housing 20 is fixed to the spray gun body 1 in a manner including, but not limited to, screw connection and the like. The holding pressure vessel 23 is fixed to the holder 29.

The conductive liquid storage tank 21, the atomizing pump 22, the pressure maintaining container 23 and the pressurizing pump 24 are connected in sequence. The conductive liquid storage tank 21 stores therein a conductive liquid composed of pure water and an easily electrolytic substance (for example, sodium chloride). The pressure sensor 25 detects the pressure of the gas mist in the holding vessel 23, and the temperature sensor 26 detects the temperature of the gas mist in the holding vessel 23. An electric heating element 271 is provided in the pressure holding container 23 for heating the aerosol in the pressure holding container, and an electric heating wire may be used as the electric heating element 271. The heating element energization switch 272 is provided on a path in which the power source 273 supplies power to the heating element 271.

The powder reinforcing nozzle 5 is connected with the front end of the spray gun body 1, the powder reinforcing nozzle 5 is provided with a central through hole, the hole wall of the central through hole is provided with a plurality of aerial fog holes (not shown in the figure), the outer side surface of the powder reinforcing nozzle 5 is provided with an aerial fog inlet, and the aerial fog inlet is communicated with the aerial fog holes. One end of the conduit 4 is connected to the outlet of the booster pump 24, and the other end of the conduit 5 is connected to the aerosol inlet. The powder reinforcing spray head 5 is in a round table shape, the end with the smaller diameter of the powder reinforcing spray head 5 is connected with the front end of the spray gun body 1, and the connection mode can adopt detachable connection modes such as clamping connection and threaded connection.

A first signal input end of the static reinforcing controller 3 is connected with an output end of a pressure sensor 25, a second signal input end of the static reinforcing controller 3 is connected with an output end of a temperature sensor 26, and a first output end and a second output end of the static reinforcing controller 3 are respectively connected with the atomizing pump 22 and the booster pump 24 and are used for respectively controlling the starting and stopping of the atomizing pump 22 and the booster pump 24; the third output terminal of the static electricity boosting controller 3 is connected to the control terminal of the heating element energizing switch 272 for controlling the on and off of the heating element energizing switch 272. In the present embodiment, the static electricity boosting controller 3 is a PLC controller. The static enhancement controller 3 is used for controlling the atomizing pump 22 to start when the pressure of the aerosol in the pressure-holding container 23 is lower than a preset pressure lower limit value, and controlling the atomizing pump 22 to stop working when the pressure of the aerosol in the pressure-holding container 23 is greater than or equal to a preset pressure upper limit value; when the temperature of the mist in the pressure container 23 is lower than the predetermined lower temperature limit value, the heating element energization switch 272 is controlled to be turned on to operate the electric heating element 271, and when the temperature of the mist in the pressure container 23 is equal to or higher than the predetermined upper temperature limit value, the heating element energization switch 272 is controlled to be turned off to stop heating of the electric heating element 271. When the pressure of the mist in the holding vessel 23 is satisfied, the atomizing pump 22 does not need to be actuated. The gas mist output from the pressure maintaining container 23 needs to be pressurized by the pressurizing pump 24 and then output to the powder booster nozzle 5. The temperature of the gas mist is related to the saturation humidity of the gas mist, and the lower the temperature of the gas mist, the lower the saturation humidity of the gas mist, and the higher the temperature of the gas mist, the higher the saturation humidity of the gas mist. In order to satisfy the humidity of the gas mist supplied to the powder booster nozzle 5, it is necessary to control the temperature of the gas mist.

Further, the pressure holding container 23 is provided with a pressure relief port 231 and a liquid discharge port 232, the pressure relief port 231 being provided at the top of the pressure holding container 23, and the liquid discharge port 232 being provided at the bottom of the pressure holding container 23. The pressure relief opening 231 is provided with a safety relief valve 281, a pressure relief air outlet of the safety relief valve 281 is communicated with the atmosphere, and the safety relief valve 281 is automatically opened when the aerosol pressure in the pressure-retaining container 23 is greater than a predetermined pressure relief pressure. The liquid outlet of the drain valve 232 is connected to the atmosphere, and the drain valve 282 is automatically opened when the liquid level in the pressure container 23 is higher than a predetermined liquid level. The safety relief valve 281 is opened to relieve the pressure after the aerosol pressure in the pressure maintaining container 23 exceeds a safety value, so that the aerosol pressure in the pressure maintaining container 23 can be reduced, and safety is ensured. The drain valve 232 is provided to drain the liquid condensed from the aerosol. The safety relief valve 281 is a mechanical safety relief valve of a spring direct action type, and the drain valve 282 is a floating ball type mechanical drain valve. In other embodiments, the safety relief valve 281 and the drain valve 282 may be electrically controlled valves, and the static electricity boosting controller 3 may be connected to control ends of the safety relief valve 281 and the drain valve 282, respectively, in which case a liquid level sensor may be disposed in the pressure-holding container 23, and an output end of the liquid level sensor may be connected to the static electricity boosting controller 3.

The working principle of the electrostatic powder gun according to the embodiment of the present invention is roughly as follows.

The atomized conductive liquid aerosol is stored in a pressure maintaining container 23 with controlled temperature and controlled pressure. After the static electricity generating device starts to work (i.e. the trigger 6 is pulled), the static enhancement controller 3 controls the booster pump 24 to start, outputs aerial fog, conveys the aerial fog to the powder enhancement nozzle 5 at the front end of the spray gun through the guide pipe 4, and relaxes and uniformly releases around the discharge needle 12 at the front end of the spray gun through a plurality of aerial fog outlet holes of the powder enhancement nozzle 5, and the air ionization effect under the action of the high-voltage static electricity is improved by utilizing the humidity increasing principle, so that the effect of improving the electrification of the powder is achieved. Furthermore, the embodiment of the utility model provides a enable high-pressure spraying electrostatic voltage from current 60 ~ 80 kilovolts drop to 40 ~ 60 kilovolts, make the coating thickness of spraying on the work piece more even unanimous, make the regional coating thickness of electrostatic shielding increase simultaneously.

The foregoing description is provided to further illustrate the present invention in connection with the detailed description and the accompanying drawings. However, it is obvious that the present invention can be implemented in various other ways than those described herein, and those skilled in the art can make popularization and deduction according to actual use without departing from the content of the present invention, and therefore, the content of the above specific embodiments should not limit the scope of protection determined by the present invention.

Claims

1. An electrostatic powder spray gun comprises a spray gun body; the electrostatic powder gun is characterized by further comprising an electrostatic enhancement device, an electrostatic enhancement controller, a guide pipe and a powder enhancement nozzle;

the static enhancement device comprises a conductive liquid storage tank, an atomizing pump, a pressure maintaining container, a booster pump and a pressure sensor; the conductive liquid storage tank, the atomizing pump, the pressure maintaining container and the booster pump are sequentially connected, and the pressure sensor is used for detecting the aerosol pressure in the pressure maintaining container;

the powder enhancing nozzle is connected with the front end of the spray gun body and is provided with a central through hole, the hole wall of the central through hole is provided with an aerosol outlet hole, the outer side surface of the powder enhancing nozzle is provided with an aerosol inlet, and the aerosol inlet is communicated with the aerosol outlet hole;

one end of the guide pipe is communicated with an outlet of the booster pump, and the other end of the guide pipe is communicated with the aerosol inlet;

the first signal input end of the static enhancement controller is connected with the output end of the pressure sensor, and the static enhancement controller is used for respectively controlling the starting and stopping of the atomizing pump and the booster pump.

2. An electrostatic powder gun according to claim 1, wherein the electrostatic boost controller is configured to control the atomizing pump to start when the pressure of the mist in the pressure vessel is lower than a predetermined lower pressure limit value, and to control the atomizing pump to stop when the pressure of the mist in the pressure vessel is greater than or equal to a predetermined upper pressure limit value.

3. An electrostatic powder gun according to claim 1 or 2, wherein the static enhancing means comprises a temperature sensor, an electrical heating element and a heating element energising switch;

the temperature sensor is used for detecting the temperature of the gas fog in the pressure maintaining container, and the output end of the temperature sensor is connected with the second signal input end of the static enhancement controller;

the electric heating element is arranged in the pressure maintaining container and used for heating the aerial fog in the pressure maintaining container;

the heating element power-on switch is arranged on a path of power supply of the power supply to the heating element, and the static electricity enhancement controller is used for controlling the on and off of the heating element power-on switch.

4. An electrostatic powder gun according to claim 3, wherein the electrostatic boost controller is configured to control the heating element energisation switch to be switched on when the temperature of the aerosol in the pressurised container is below a predetermined lower temperature limit, and to control the heating element energisation switch to be switched off when the temperature of the aerosol in the pressurised container is greater than or equal to a predetermined upper temperature limit.

5. An electrostatic powder gun according to claim 3, wherein the electrical heating element is an electrical heating wire.

6. An electrostatic powder gun according to claim 1, wherein the pressure maintaining container is provided with a pressure relief port, and the pressure relief port is provided at the top of the pressure maintaining container;

the pressure relief opening is provided with a safety pressure relief valve, a pressure relief air outlet of the safety pressure relief valve is communicated with the atmosphere, and the safety pressure relief valve is automatically opened when the pressure of the aerial fog in the pressure maintaining container is greater than the preset pressure relief pressure.

7. An electrostatic powder spray gun according to claim 1, wherein the pressure maintaining container is provided with a liquid discharge port, and the liquid discharge port is arranged at the bottom of the pressure maintaining container;

and the liquid outlet is provided with a liquid discharge valve, the liquid outlet of the liquid discharge valve is communicated with the atmosphere, and the liquid discharge valve is automatically opened when the liquid level in the pressure maintaining container is higher than the preset liquid level.

8. An electrostatic powder gun as claimed in claim 1, wherein the powder booster nozzle is in the form of a truncated cone, the end of the powder booster nozzle having the smaller diameter being connected to the forward end of the gun body.

9. An electrostatic powder gun according to claim 1, wherein the electrostatic charge enhancing means comprises a housing, the reservoir for conductive liquid, the atomizing pump, the pressure-holding vessel, the booster pump and the pressure sensor being provided in the housing;

the shell is fixed on the spray gun body.

10. An electrostatic powder gun according to claim 1, wherein the electrostatic boost controller is a PLC controller.