JP-7857487-B1 - Electrostatic discharge device

Abstract

[Problem] To provide an electrostatic dispensing device that can disperse powder material and adhere it to a workpiece. [Solution] The electrostatic discharge device comprises a main body through which powder material can pass, a discharge section having a plurality of nozzles for discharging the powder material that has passed through the main body, and discharge electrodes for charging the powder material discharged from the nozzles by corona discharge. The discharge section has discharge ports at the tips of each nozzle arranged in a predetermined direction, and a plurality of discharge electrodes are provided around the discharge section. [Selection Diagram] Figure 1

Inventors

• 櫻井 宣文
• 小田 真也

Assignees

• 旭サナック株式会社

Dates

Publication Date

20260512

Application Date

20251017

Claims (2)

1. A main body through which powder material can pass, A discharge unit having a plurality of nozzles for discharging the powder material that has passed through the main body, The device comprises a discharge electrode that charges the powder material discharged from the nozzle by corona discharge, The discharge section is provided with the discharge ports at the tips of each nozzle arranged in a predetermined direction. Multiple discharge electrodes are provided around the discharge section and at positions that straddle the imaginary line connecting each of the discharge ports. Electrostatic discharge device.
2. The plurality of nozzles are provided such that each discharge port is positioned in a direction perpendicular to the direction in which the main body extends. The electrostatic discharge device according to claim 1.

Description

Embodiments of the present invention relate to an electrostatic discharge device. Patent Document 1 discloses a powder coating method in which charged powder coating is discharged from a coating gun along with a transport gas to apply the coating to an object. The coating gun in Patent Document 1 has multiple nozzle tubes that branch out radially from the gun body. These multiple nozzle tubes are aligned in series by a tube support. The powder coating, having passed through multiple nozzle tubes, is discharged from the outlet towards the object to be coated, along with the transport air. Furthermore, using multiple nozzle tubes makes it easier to ensure a wide spray pattern width. Japanese Patent Publication No. 2011-050812 This diagram schematically shows an example of the configuration of an electrostatic discharge device according to one embodiment.A front view showing an example of an electrostatic discharge device according to one embodiment, in which multiple discharge electrodes are arranged on both sides of the nozzle.This diagram shows the coating process when powder material is applied to a workpiece without arranging multiple discharge electrodes around the nozzle.This figure shows the coating process when a powder material is applied to an object to be coated using an electrostatic dispensing device according to one embodiment. The following describes one embodiment with reference to the drawings. Note that, for the sake of explanation, the dimensions of each component may be enlarged in the drawings as needed, and the dimensional ratios between components may not be the same as in reality. The electrostatic discharge device 1 shown in Figure 1 coats or applies powder materials, such as powder paints, to a workpiece 90 using electrostatic attraction caused by corona discharge. The powder material contains conductive substances, such as metals or carbon. Powders can also include granular particles. In this embodiment, powder materials with small particle sizes or low electrical resistances, resulting in a low charge, can be used. As shown in Figure 1, the electrostatic dispensing device 1 comprises a dispensing gun 10, a material supply device 20, and a discharge unit 30. The dispensing gun 10 is an automatic gun capable of automatically coating or applying powder material to the object to be coated 90. The electrostatic dispensing device 1 may also be a manual gun operated by an operator. The object to be coated 90 is grounded via an earth wire 91. In this embodiment, the dispensing gun 10 is used fixed to, for example, a fixed member (not shown). The dispensing gun 10 may also be mounted on a moving mechanism, such as a reciprocator, and configured to be movable relative to the object to be coated 90. Note that in Figure 1, the left side of the paper represents the direction of powder material discharge and is the tip side of the dispensing gun 10, while the right side of the paper represents the opposite direction of powder material discharge and is the base end side of the dispensing gun 10. The discharge gun 10 is connected to the material supply device 20. The discharge gun 10 receives powder material supplied from the material supply device 20 and discharges the powder material toward the object to be coated 90. The material supply device 20 receives powder material contained in the material tank 201 and supplies the powder material to the discharge gun 10. For example, fluidized air 201a is supplied to the material tank 201, which loosens and dehumidifies the powder material in the material tank 201. Furthermore, the material supply device 20 includes a screw feeder unit 21 and an injector 22. The screw feeder unit 21 is located downstream of the material tank 201 in the direction of discharge of the powder material. While the screw feeder unit 21 has a well-known configuration and therefore a detailed explanation is omitted, it quantitatively discharges the powder material by rotating the blades of a screw (not shown) under the driving force of a drive motor 211. The material supply device 20 quantitatively supplies the powder material at an arbitrarily set discharge rate by changing the rotational speed of the screw blades in response to changes in the rotational speed of the drive motor 211, for example. The injector 22 sucks up the powder material discharged from the screw feeder unit 21 and supplies the sucked powder material to the discharge gun 10 via the paint hose 23. The injector 22 is supplied with conveying air 22a from an air supply source (not shown), such as a compressor, and the powder material is sucked up from the screw feeder unit 21 by the conveying air 22a. The airflow rate of the conveying air 22a is controlled by a control device (not shown) according to a predetermined discharge rate. The paint hose 23 is formed from a tubular member and is located between the injector 22 and the discharge gun 10. The dispensing gun 10 has a main body 11, a material flow path 12, a