JPH04106655U - electrostatic coating equipment - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to ensure insulation between the gun body and the booster part, and to perform highly accurate and efficient electrostatic painting work. A low voltage input through an input terminal 62 of a booster section 54 is boosted to a predetermined high voltage by the booster section 54 and directly applied to the conductive paint inside the gun body 52. At that time, the connection part 51 of the gun body 52 becomes high voltage, but the distance L between the connection part 51 of the gun body 52 and the input terminal 62
However, since the distance is selected to be greater than the distance at which the high voltage can be insulated by air, a predetermined high voltage can be maintained without causing electrical leakage.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an electrostatic coating method that uses conductive paint to which high voltage is directly applied. Regarding equipment.

0002

[Conventional technology]

Conventionally, high voltage is applied directly to conductive paint to generate static electricity on objects to be painted, such as automobile bodies. For example, a voltage block method is known as a method for applying coating. this method , once a conductive paint is introduced into an intermediate reservoir that is insulated from ground potential. From this intermediate reservoir, the paint is then fed through the paint path to the paint gun, which is at a high potential. Due to this, electrostatic painting work is being performed on objects to be painted.

0003 In this case, the painting gun is a gun that sprays conductive paint onto the object to be painted. Boosts the voltage input to the body and the outside of this gun body to a predetermined high voltage. A device equipped with a booster section for increasing the voltage is known.

0004

[Problem that the idea aims to solve]

However, this type of painting gun has a pressure booster attached to the outside of the gun body. Therefore, a high voltage, for example, approximately -60kV, is applied to the entire gun body via this booster. The connection of the paint supply pipe to this gun body and the input of the low voltage booster Electrical leakage is likely to occur between the terminal and the terminal. This makes it possible to maintain a predetermined high voltage. There is a problem of scratches and the inability to perform an efficient electrostatic coating operation.

[0005] The present invention solves this type of problem by eliminating the gap between the gun body and the booster. It is possible to secure the edges and perform high-precision and efficient electrostatic painting work. The purpose of this invention is to provide a capable electrostatic coating device.

[0006]

[Means to solve the problem] In order to achieve the above object, the present invention provides a conductive paint to which high voltage is directly applied. In electrostatic painting equipment that applies electrostatic painting by supplying paint to a paint gun through a paint supply pipe. , The painting gun includes a gun body that sprays conductive paint; and a step-up section that steps up the voltage input from the input terminal to the high voltage. Together, The distance between the connection part of the paint supply pipe to the gun body and the input terminal of the booster part is The distance is selected to be at least a distance that can insulate the high voltage with air.

[0007]

[Effect]

In the electrostatic coating device according to the present invention described above, the input voltage is The low voltage is boosted to a predetermined high voltage by this step-up section and directly applied to the conductive paint inside the gun body. When the electrical current is applied, this conductive paint is sprayed from the gun body onto the object to be coated and static Electrical painting is performed. At that time, the connection of the paint supply pipe to the gun body becomes high voltage. , the distance between this connection and the input terminal of the booster section is such that the high voltage can be isolated by air. Since the distance between the gun body and the input terminal is selected to be greater than A predetermined high voltage can be maintained.

[0008]

【Example】

Examples of the electrostatic coating device according to the present invention will be given, and with reference to the attached drawings. This will be explained in detail below.

[0009] In FIG. 2, reference numeral 10 indicates an electrostatic coating device according to the present invention. This electrostatic The coating device 10 includes a grounded color change valve mechanism 12, and the color change valve mechanism 12 includes: A first cleaning valve 14 that controls the supply of air (A), water (W), cleaning liquid (S), etc. , a plurality of paint valves 16a to 16c capable of supplying conductive paint of different colors. are provided. This color change valve mechanism 12 includes at least a portion of the polytetra It has an electrically insulating conduit 17 made of resin such as fluoroethylene (PTFE). A supply channel 20 is connected, in which a block valve mechanism 18 including a border line 17 is arranged.

0010 This block valve mechanism 18 includes switching valves 22a and 22b, and the switching valve on the inlet side. The valve 22a connects the color change valve mechanism 12 with air (A), water (W), and cleaning liquid ( S) etc. is switched to the second cleaning valve 24 that controls the supply of the It is connected to the intermediate storage tank 26. This intermediate storage tank 26 is separated via a piston 28. A first cylinder chamber 30 for injecting conductive paint and cleaning liquid, and a first cylinder chamber 30 for supplying air. 2 cylinder chamber 32, and an air supply source 34 is provided with a flow rate in this second cylinder chamber 32. They communicate via a regulating valve 36 and an on-off valve 38. This air supply source 34 is connected to the booster 4 connected to a conductive paint flow regulator 42 for regulating air pressure via 0; The flow rate regulator 42 controls the discharge amount of the conductive paint. Switching valve 22b is connected to a waste liquid tank 46 via a discharge path 44.

[0011] A delivery path (paint supply pipe) 48 is connected to the first cylinder chamber 30 of the intermediate storage tank 26. The coating gun 50 is connected to the terminal. As shown in FIG. 1, this coating gun 50 has a delivery path 48 is connected via the connecting part 51, and the conductive paint is applied to the object to be coated (not shown). The gun body 52 sprays water at a high voltage (e.g. -60 kV). It includes a booster section 54 consisting of a booster cascade or the like for increasing the pressure. this cancer book A dump valve 56 and a trigger valve 58 are disposed within the body 52 (see FIG. 2). ), a cover member 60 is fixed to the rear end of the gun body 52, and this cover member 60 A booster unit 54 is arranged inside.

0012 This booster 54 has an input terminal 62 connected to a power source (not shown), and an input terminal 62 connected to a power source (not shown). Output for supplying to the gun body 52 after boosting the low voltage input from the child 62 A high voltage cable 66 connected to the output terminal 64 is connected to the joint part. It is connected to the gun body 52 via a material 68. Rear end of gun body 52 and boosting pressure The portion 54 is fixed via an angle member 70 and a connecting member 72, and this The distance L between the connection part 51 of the gun body 52 and the input terminal 62 of this booster part 54 is The distance is selected to be at least the distance that can insulate high voltage with air. Specifically, -40kV Approximately 100mm when applying -60kV, approx. 200mm when applying -80kV. It is about 300 mm when applying voltage, and about 350 mm when -90 kV is applied.

[0013] Next, the operation of the electrostatic coating apparatus 10 configured as described above will be explained. First, conductive paint of a predetermined color is pumped from the paint valve 16a of the color change valve mechanism 12 and supplied. The first cylinder chamber 30 of the intermediate storage tank 26 is filled through the supply path 20, and then sent out. The paint gun 50 is filled via the passage 48. During this filling, the trigger valve 58 is closed, while the dump valve 56 is opened, and after filling, the dump valve 56 is closed. be done.

[0014] Therefore, the switching operation of the switching valves 22a and 22b of the block valve mechanism 18 is performed. Then, the block valve mechanism 18 is cleaned under the driving action of the second cleaning valve 24. The cleaning liquid and water used for cleaning are discharged to a waste liquid tank 46 via a discharge path 44. It will be done. Then, the block valve mechanism 18 is dried, and thereby the color change valve mechanism 12 and the intermediate block valve mechanism 18 are dried. The intermediate storage tank 26 is electrically insulated.

[0015] Next, the intermediate storage is supplied from the air supply source 34 via the flow rate adjustment valve 36 and the on-off valve 38. Driving air is supplied to the second cylinder chamber 32 of the storage tank 26, and the piston 28 moves into the first cylinder chamber 32. Displaced to the cylinder chamber 30 side, the conductive paint is applied to the gun main body under the opening action of the trigger valve 58. The liquid is sprayed from the body 52 onto an object to be coated (not shown). At that time, the input terminal 6 is connected to the booster 54. The low voltage input from 2 is boosted to a predetermined high voltage by this booster 54, and the output terminal is Directly applied to the conductive paint inside the gun body 52 via the terminal 64 and high voltage cable 66 be done.

[0016] In this case, when a high voltage is applied to the conductive paint inside the gun body 52, the gun body While the connection part 51 of the body 52 is charged with a high voltage, the input terminal 62 of the booster part 54 is charged with a low voltage. Since a voltage is applied, there is a A large potential difference occurs. For this reason, especially the connection part 51 of the gun body 52 and the input terminal There is a risk of electrical leakage between the terminal and 62.

[0017] Here, in this embodiment, the connection part 51 of the gun body 52 and the input terminal 6 of the booster part 54 2 is selected to be at least a distance that can insulate the high voltage with air. . Therefore, electric leakage between the connection part 51 of the gun body 52 and the input terminal 62 can be effectively prevented. It is possible to apply a predetermined high voltage to conductive paint with high accuracy and effectiveness. The effect is that it becomes possible to carry out efficient electrostatic painting operations.

[0018]

[Effect of the idea]

According to the electrostatic coating device according to the present invention, the following effects can be obtained.

[0019] The low voltage input through the input terminal of the booster is turned into a predetermined high voltage by this booster. When the voltage is boosted and applied directly to the conductive paint inside the gun body, the entire gun body experiences a high voltage. However, if the distance between the gun body and the input terminal of the booster section is By selecting a distance greater than that which can be insulated by the above-mentioned gun body and input terminal, It is possible to effectively prevent the occurrence of electrical leakage between the two. For this reason, conductive paint It is now possible to reliably apply a constant high voltage, allowing for highly accurate and efficient electrostatic painting. The work is accomplished.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal sectional view of a coating gun constituting an electrostatic coating apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of the electrostatic coating device.

[Explanation of symbols] 10...Electrostatic coating device 12...Color change valve mechanism 18...Block valve mechanism 26...Intermediate storage tank 48…Sending path 50...painting gun 51...Connection part 52...Gun body 54...boosting section 62...Input terminal 64...Output terminal 66...High voltage cable 68...Joint member

Continuation of front page (72) Creator Ichiro Ishibashi Hondae, 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Within Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An electrostatic coating device that performs electrostatic painting by supplying conductive paint to which a high voltage is directly applied to a paint gun via a paint supply pipe, wherein the paint gun sprays the conductive paint. It includes a gun body and a voltage booster that boosts the voltage input from the input terminal to the high voltage, and the distance between the connection part of the paint supply pipe to the gun body and the input terminal of the booster is such that An electrostatic coating device characterized in that the distance is selected to be greater than the distance that can insulate the voltage with air.