Electrostatic Paint Gun

Abstract

To improve workability during coating.SOLUTION: An electrostatic coating gun includes: a gun body 10 which has a nozzle 13 for discharging coating; a high voltage generator 15 which is mounted in the gun body 10 and applies static electricity to the coating; and a power supply device 20 which is provided integrally with the gun body 10 and supplies electric power to the high voltage generator 15. The power supply device 20 includes a charging element 24. Since electric power can be supplied to the high voltage generator 15 by the charging element 24, a power transmission cable for feeding electric power to the high voltage generator 15 from a power source provided outside the gun body 10 can be eliminated. By eliminating the need for the power transmission cable, workability during coating can be improved.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electrostatic paint gun. [Background technology]

[0002] Patent Document 1 discloses a spray gun for electrostatic painting. The spray gun has a built-in high-voltage generator for applying a high voltage between the spray gun and the object to be painted, and sprays electrically charged paint to be applied to the object to be painted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-136177 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned spray gun is designed to supply power to the high voltage generator from a power source installed outside the spray gun via a power transmission cable. Therefore, when moving the spray gun, the power transmission cable gets in the way and makes it difficult to handle. Also, if the power transmission cable breaks, painting will be interrupted. The object of the invention is to eliminate the need for a power transmission cable and improve the workability of painting.

[0005] The present invention was completed in view of the above circumstances, and an object of the present invention is to improve workability during painting. [Means for solving the problem]

[0006] The present invention relates to A gun body having a nozzle for discharging paint; a high voltage generator attached to the gun body for applying static electricity to the paint; a power supply device that is integrally provided in the gun body and supplies power to the high voltage generator; The power supply device includes a charging element. Effect of the Invention

[0007] Since the charging element can supply power to the high voltage generator, it is possible to eliminate the need for a power transmission cable for supplying power from a power source provided outside the gun body to the high voltage generator. By eliminating the need for a power transmission cable, it is possible to improve workability during painting. [Brief description of the drawings]

[0008] [Figure 1] Side view of the electrostatic spray gun of Example 1 [Diagram 2] FIG. 1 is a circuit diagram showing a state in which the main power supply is transmitting power to the high voltage generator and charging the charging element in the first embodiment. [Diagram 3] FIG. 1 is a circuit diagram showing a state in which power is being transmitted to a high-voltage generator by a charging element in the first embodiment; [Figure 4] A circuit diagram showing a state in which the main power supply is transmitting power to the high voltage generator and charging the charging element in the second embodiment. [Diagram 5] FIG. 11 is a circuit diagram showing a state in which power is being transmitted to a high voltage generator by a charging element in the second embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The power supply device includes a main power supply having a larger discharge capacity than the charging element. With this configuration, by making the charging element function as an auxiliary power supply, power supply redundancy can be achieved by the main power supply and the charging element.

[0010] The main power source is capable of charging the charging element. With this configuration, the charging element can be charged without being removed from the gun body.

[0011] A current loop is formed between the Cockcroft-Walton circuit of the high voltage generator and the main power supply, and the charging element is connected to the current loop. With this configuration, the charging element can be charged by utilizing the discharge energy.

[0012] A power transmission circuit is configured between the main power supply and the control circuit of the high voltage generator, and the charging element is connected in parallel to the power transmission circuit, so that the charging element can be charged by the power of the main power supply.

[0013] The charging element is an all-solid-state battery. A charging element made of an all-solid-state battery can have a large discharge capacity and can therefore be used as a main power source.

[0014] <Example 1> A first embodiment of the present invention will be described below with reference to Figs. 1 to 3. In the following description, the left side in Fig. 1 is defined as the front side. The electrostatic coating gun of this first embodiment is a hand gun including a gun body 10, a high voltage generator 15, and a power supply unit 20. As shown in Fig. 1, the gun body 10 has a gun body 11 that is elongated in the front-rear direction, and a grip 12 that extends downward from the lower end of the gun body 11. A nozzle 13 for discharging paint is provided at the front end of the gun body 11. When a trigger 14 provided on the grip 12 is operated, paint is discharged from the nozzle 13.

[0015] The high voltage generator 15 is built into the gun body 11. As shown in Figs. 2 and 3, the high voltage generator 15 includes a Cockcroft-Walton circuit 16, a control circuit 17, and a transformer 18. The control circuit 17 is connected to the primary side of the transformer 18, and the Cockcroft-Walton circuit 16 is connected to the secondary side of the transformer 18. The current supplied to the control circuit 17 is boosted by the transformer 18, and is further boosted and rectified by the Cockcroft-Walton circuit 16. An electrode (not shown) at the front end of the gun body 11 is connected to the Cockcroft-Walton circuit 16 via an output resistor 19.

[0016] The power supply device 20 is built into the gun body 10. As shown in FIGS. 2 and 3, the power supply device 20 includes a power transmission circuit 21, a charging circuit 22, a main power source 23, and a charging element 24. The power transmission circuit 21 and the charging circuit 22 are housed, for example, in the rear end of the gun body 11 and connected to the control circuit 17 of the high voltage generator 15. The power transmission circuit 21 is connected to the main power source 23 housed in the grip 12. The main power source 23 is a rechargeable battery having a discharge capacity larger than that of the charging element 24. The power transmission circuit 21 is connected to a diode 25 that rectifies the current so that the current flows in one direction from the main power source 23 side to the control circuit 17 side. In the power transmission circuit 21, a first path 26 and a second path 27 that connect the main power source 23 and the control circuit 17 are connected to the first path 26 to which the diode 25 is connected, and a switch 28 that opens and closes the first path 26 between the diode 25 and the control circuit 17 is connected.

[0017] The charging circuit 22 is connected between the second path 27, to which the diode 25 and the switch 28 are not connected, and the earth equivalent part 16E of the Cockcroft-Walton circuit 16. When the Cockcroft-Walton circuit 16 is performing voltage step-up and rectification, a current loop R passing through the Cockcroft-Walton circuit 16, the charging circuit 22, the main power supply 23, and the first path 26 of the power transmission circuit 21 is formed, as shown in Fig. 2.

[0018] A charging element 24 is connected to the charging circuit 22 that constitutes the current loop R. A diode 25 that rectifies the current flow so that it is unidirectional, from the charging circuit 22 side to the charging element 24 side, is connected between the charging circuit 22 and the charging element 24. The charging element 24 and a first path 26 of the control circuit 17 are connected via a third path 29.

[0019] When the main power supply 23 is sufficiently charged, as shown in Fig. 2, the switch 28 is closed and power is supplied from the main power supply 23 to the control circuit 17 of the high-voltage generator 15 by the power transmission circuit 21, and the power is boosted and rectified in the Cockcroft-Walton circuit 16. When the trigger 14 is operated in this state, the paint is discharged from the nozzle 13 in a state in which it has been charged by the high-voltage generator 15, and is applied to the workpiece (not shown) by electrostatic action. During painting, a current loop R is formed that passes through the Cockcroft-Walton circuit 16, the charging circuit 22, the main power supply 23, and the first path 26 of the power transmission circuit 21, and the charging element 24 connected to the charging circuit 22 is charged.

[0020] 3, when the main power supply 23 is depleted, the switch 28 opens, power supply from the main power supply 23 to the high voltage generator 15 in the power transmission circuit 21 stops, and power supply to the high voltage generator 15 is switched from the main power supply 23 to the charging element 24. Power supply from the charging element 24 to the high voltage generator 15 is performed in a circuit that passes through the third path 29, the first path 26, and the control circuit 17, as shown by the dashed line in FIG.

[0021] The electrostatic coating gun of the present embodiment 1 includes a gun body 10, a high voltage generator 15, and a power supply unit 20. The gun body 10 has a nozzle 13 that ejects paint. The high voltage generator 15 is attached to the gun body 10 and applies static electricity to the paint. The power supply unit 20 is provided integrally with the gun body 10 and supplies power to the high voltage generator 15. The power supply unit 20 includes a charging element 24. Since power can be supplied to the high voltage generator 15 by the charging element 24, a power transmission cable for supplying power from a power source provided outside the gun body 10 to the high voltage generator 15 can be eliminated. By eliminating the need for a power transmission cable, workability during painting can be improved.

[0022] The power supply device 20 includes a main power supply 23 having a larger discharge capacity than the charging element 24. By making the charging element 24 function as an auxiliary power supply, power supply redundancy can be achieved by the main power supply 23 and the charging element 24. The charging element 24 is an all-solid-state battery. The charging element 24, which is an all-solid-state battery, can have a large discharge capacity, so it can also be used as the main power supply 23.

[0023] The main power supply 23 is capable of charging the charging element 24. This allows the charging element 24 to be charged without being removed from the gun body 10. During painting, a current circulates between the Cockcroft-Walton circuit 16 and the main power supply 23 due to discharge energy. This circulating current forms a current loop R between the Cockcroft-Walton circuit 16 and the main power supply 23. The charging element 24 is connected in the middle of the current loop R. This allows the charging element 24 to be constantly charged using the discharge energy of the current loop R during painting.

[0024] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. In the first and second embodiments, the main power source may be an air turbine generator. In the first and second embodiments, the charging element may be charged by connecting the charging element removed from the gun body to a charger without using power from the main power supply. In the first and second embodiments, the charging element may be a capacitor mounted on a circuit board. Also, as the charging element, both an all-solid-state battery and a capacitor may be provided in parallel in the gun body. According to the present invention, the power supply device may be composed of only a charging element. The present invention is not limited to application to handguns, but can also be applied to automatic guns. [Explanation of symbols]

[0025] 10…Gun body 13…Nozzle 15...High voltage generator 16…Cockcroft-Walton Circuit 17...Control circuit 20, 30…Power supply device 21, 31...Transmission circuit 23…Main power supply 24...Charging element R…Current loop

Claims

1. A gun body having a nozzle for discharging paint; a high voltage generator attached to the gun body for applying static electricity to the paint; a power supply device that is integrally provided in the gun body and supplies power to the high voltage generator; The power supply device includes a charging element and a main power supply having a discharge capacity larger than that of the charging element, The main power source is capable of charging the charging element; a current loop is formed between the Cockcroft-Walton circuit of the high voltage generator and the main power supply; An electrostatic paint gun, the charging element being connected to the current loop.

2. A gun body having a nozzle for discharging paint; a high voltage generator attached to the gun body for applying static electricity to the paint; a power supply device that is integrally provided in the gun body and supplies power to the high voltage generator; The power supply device includes a charging element and a main power supply having a discharge capacity larger than that of the charging element, Electrostatic spray gun, wherein a power loop is formed between the Cockcroft-Walton circuit of the high voltage generator and the main power supply.

3. 3. The electrostatic spray gun of claim 2, wherein the main power source is capable of charging the charging element.

4. a power transmission circuit is configured between the main power supply and a control circuit of the high voltage generator; 4. The electrostatic paint gun according to claim 1, wherein the charging element is connected in parallel to the control circuit in the power transmission circuit.

5. The electrostatic paint gun according to any one of claims 1 to 4, wherein the charging element is a solid-state battery.

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