JP2005087995A - Voltage interrupting device and electrostatic coating system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic coating system increasing an efficiency of a voltage interrupting device. <P>SOLUTION: In the electrostatic coating system 10, a cathode voltage is applied on a coating to be sprayed toward a material to be coated wherein an anode voltage is applied. This coating system 10 is equipped with a tank 16 as a coating source, a spray 12 wherein the cathode voltage is applied, and a voltage interrupting device 26, arranged between the tank 16 and the spray 12, preventing the cathode voltage from being conducted to the coating source. The voltage interrupting device 26 is equipped with a changeover switch 40 having an inlet port 42 communicating with the coating source 16 and an outlet port 44 communicating with the spray 12, and a reservoir 28 having the first room 32 and the second room 34. When the changeover switch 40 is at the first position, the inlet port 42 communicates with the first room 32 and the outlet port 44 communicates with the second room 34, and when the changeover switch 40 is at the second position, the inlet port 42 communicates with the second room 34 and the outlet port 48 communicates with the first room 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrostatic coating system, and more particularly to a voltage interrupt device used in an electrostatic coating system.

  The electrostatic coating system uses the grounded paint as the anode and the sprayer as the cathode, applies a negative high voltage to the sprayer, creates an electrostatic field between the two electrodes, and negatively charges the atomized paint. It is a system that efficiently adsorbs paint to a certain object. Recently, water-based paints are increasingly used as paints in electrostatic coating systems. When using water-based paint in an electrostatic coating system, a voltage interrupting device is used to prevent the voltage applied to the paint in the sprayer from being transmitted to the supply source through the water-based paint, which is a conductive material. Located between the source and the nebulizer. An example of such a voltage cutoff device is disclosed in Japanese Patent Laid-Open No. 6-198228.

JP-A-6-198228

  The voltage interrupting device disclosed in Japanese Patent Laid-Open No. 6-198228 is composed of first and second operation transfer units and a switching valve which are provided independently, and is very large in size, resulting in an increase in manufacturing cost or painting. There is a problem that the installation area at the site becomes large.

  An object of the present invention is to solve such problems of the prior art, and it is an object of the present invention to provide a small and highly efficient voltage interrupting device and an electrostatic coating system using the voltage interrupting device.

The present invention according to claim 1 is an electrostatic coating system in which a cathode voltage is applied to a paint supplied from a paint source to a sprayer and sprayed toward an object to which a positive voltage is applied. In a voltage interrupting device that prevents the oil from being transmitted to the paint source,
A switch provided with a slider that is selectively movable linearly between the first and second positions and has an inlet port communicating with the paint source and an outlet port communicating with the sprayer; A reservoir having first and second chambers, and when the slider is in the first position, the inlet port communicates with the first chamber, and the outlet port is the second chamber. A voltage shut-off device that communicates with a chamber and the inlet port communicates with the second chamber and the outlet port communicates with the first chamber when the slider is in the second position; To do.

According to another aspect of the present invention, a paint source, a sprayer for spraying paint from the paint source to which a cathode voltage is applied, and a voltage interruption device for preventing the cathode voltage from being transmitted to the paint source. In the electrostatic coating system that sprays toward the object to which the positive electrode voltage is applied, the voltage interrupting device includes:
A switching device provided with a slider having an inlet port communicating with the paint source and an outlet port communicating with the sprayer, the first port being selectively movable between a first position and a second position; 1 and a reservoir having a second chamber,
When the slider is in the first position, the inlet port communicates with the first chamber, and the outlet port communicates with the second chamber, and when the slider is in the second position, An electrostatic coating system is provided in which the inlet port communicates with the second chamber and the outlet port communicates with the first chamber.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Referring to FIG. 1, an electrostatic coating system 10 according to a preferred embodiment of the present invention includes a sprayer 12 to which a DC voltage is applied, a tank 16 as a supply source of water paint, that is, a paint source, and between the sprayer 12 and the tank 16. A first and second supply pipelines 20 and 22, a voltage cutoff device 26 disposed between the first and second supply pipelines 20 and 22, and a first supply pipeline 20 and 22. A first pump 18 that is disposed in the supply line 20 and sucks paint from the tank 16 and supplies it to the voltage breaker 26, and a sprayer that sucks aqueous paint from the voltage breaker 26 disposed in the second supply line 22. 12 is provided with a second pump 24 for feeding to 12.

  The voltage cutoff device 26 includes a reservoir 28 and a switching device 40. The switcher 40 is composed of a valve device having an inlet port 42, an outlet port 44, first and second reservoir ports 46, 48, connecting the inlet port 42 to the first reservoir port 46, and the outlet port 44. Is connected to the second reservoir port 48 (see FIG. 1), the inlet port 42 is connected to the second reservoir port 48, and the outlet port 44 is connected to the first reservoir port 46. It is selectively movable between the second position.

  The reservoir 28 includes a cylinder, a double-headed piston 30 slidably disposed in the cylinder, and first and second chambers 32 and 34 defined by the inner wall of the cylinder and the end faces of the double-headed piston 30. And the volume of each of the first and second chambers 32 and 34 changes in relation to each other depending on the position of the double-headed piston 30. The first chamber 32 communicates with the first reservoir port 46 via the first communication line 36, and the second chamber 34 communicates with the second reservoir port 48 via the second communication line 38. doing.

  With reference to FIGS. 2 to 6, the voltage breaker 26 according to a preferred embodiment of the present invention will now be described in more detail. 2 to 6, each component is indicated by a new reference numeral different from that in FIG. 1.

2 and 3, the voltage breaker 100 (voltage breaker 26 in FIG. 1) is shown with the switch in the first position.
The voltage cutoff device 100 mainly includes a reservoir 110, a slider 120 that forms the switching device, and first and second pipes 114a and 114b; 116a and 116b that connect the reservoir 110 and a port formed in the slider 120. It has as an element. The slider 120 is selectively movable along the central axis O between a first position shown in FIGS. 2 and 3 and a second position shown in FIGS. Referring to FIG. 6, the slider 120 is made of an insulating material, and has an upper and lower surface, a pair of opposed surfaces formed in a direction transverse to the moving direction of the slider 120 between the upper and lower surfaces, A pair of end surfaces perpendicular to the upper and lower surfaces and the pair of surfaces are formed. The slider 120 also includes an inlet passage 122 that forms an inlet port and an outlet passage 124 that forms an outlet port, which are open at each of the pair of end surfaces and are spaced apart in the vertical direction.

  The inlet passage 122 has first and second outlets 122a and 122b that open to one of the pair of surfaces, and the outlet passage 124 has first and second inlets 124a that open to the other of the pair of surfaces. , 124b. First to fourth moving quick joints 126a to 126d are attached to the first and second outlets 122a and 122b and the first and second inlets 124a and 124b, respectively. Each of the first to fourth moving quick joints 126a to 126d can be coupled to and separated from first to fourth stationary quick joints 132a to 132d described later. The slider 120 is also provided with cylindrical first to fourth movement shielding members 128a to 128d made of an insulating material so as to surround each of the first to fourth movement quick joints 126a to 126d. Yes.

  The first conduit of the voltage breaker 100 is composed of two conduits 114a and 114b connected in series via a three-way joint 118a. One end of the pipe line 114a is connected to the first chamber of the reservoir 110 through the joint 112a, and the other end is connected to the fourth stationary quick joint 132d through the three-way joint 118a. One end of the pipe line 114b is connected to the fourth stationary quick joint 132d via the three-way joint 118a, and the other end is connected to the first stationary quick joint 132a via the joint 130a.

  The second conduit of the voltage breaker 100 is composed of two conduits 116a and 116b connected in series via a three-way joint 118b. One end of the pipe line 116a is connected to the second chamber of the reservoir 110 through the joint 112b, and the other end is connected to the third stationary quick joint 132c through the three-way joint 118b. One end of the pipe line 116b is connected to the third stationary quick joint 132c via the three-way joint 118b, and the other end is connected to the second stationary quick joint 132b via the joint 130b.

  Each of the first to fourth stationary quick joints 132a to 132d is surrounded by each of the first to fourth stationary shielding members 134a to 134d made of an insulating material. Each of the first to fourth stationary shielding members 134a to 134d can be fitted to and detached from each of the first to fourth moving shielding members 128a to 128d.

Hereinafter, the operation of the present embodiment will be described.
As apparent from the above description and FIG. 2, the first and second moving quick joints 126a and 126b communicate with the paint source, and the third and fourth moving quick joints 126c and 126d communicate with the sprayer. Yes. Therefore, a high voltage is always applied between the adjacent first and third moving quick joints 126a and 126c and the second and fourth moving quick joints 126b and 126d. The movement shielding members 128a to 128d prevent leakage or discharge between the adjacent first and third moving quick joints 126a and 126c and the second and fourth moving quick joints 126b and 126d.

  When the slider 120 is in the first position shown in FIGS. 2 and 3, of the first and second moving quick joints 126a and 126b communicating with the inlet passage 122, the first moving quick joint 126a is the first moving quick joint 126a. Coupled to the first stationary quick coupling 132a forming the port, the second moving rapid coupling 126b is separate from the second stationary rapid coupling 132b forming the second port (see FIG. 2). Accordingly, the second stationary quick joint 132b is closed, and the inlet passage 122 includes the first moving quick joint 126a, the first stationary quick joint 132a, the joint 130a, the conduit 114b, the three-way joint 118a, the conduit 114a and The first chamber of the reservoir 110 communicates with the joint 112a.

  On the other hand, of the third and fourth moving quick joints 126c and 126d communicating with the outlet passage 124, the third moving quick joint 126c is coupled to the third stationary quick joint 132c forming the second port, The four moving quick joints 126d are separate from the fourth stationary quick joint 132d forming the first port (see FIG. 3). Accordingly, the fourth stationary quick joint 132d is closed, and the outlet passage 124 is connected to the reservoir 110 via the third moving quick joint 126c, the third stationary quick joint 132c, the three-way joint 118b, the conduit 116a, and the joint 112b. To the second chamber.

  When the slider 120 is in the first position, the first and fourth stationary quick joints 132a, 132d communicate with the paint source, and the second and third stationary quick joints 132b, 132c communicate with the sprayer. A high voltage is applied between the first and third stationary quick joints 132a and 132c and between the second and fourth stationary quick joints 132b and 132d. The stationary shielding members 134a to 134d prevent leakage or discharge between the adjacent first and third stationary quick joints 132a and 132c and between the second and fourth stationary quick joints 132b and 132d.

  When the slider 120 is in the second position shown in FIGS. 4 and 5, of the first and second moving quick joints 126a and 126b communicating with the inlet passage 122, the second moving quick joint 126b is the second moving quick joint 126b. Coupled to the second static quick coupling 132b forming the port, the first moving quick coupling 126a is separate from the first static quick coupling 132a forming the first port (see FIG. 4). Accordingly, the first stationary quick coupling 132a is closed, and the inlet passage 122 has a second moving rapid coupling 126b, a second stationary rapid coupling 132b, a coupling 130b, a conduit 116b, a three-way coupling 118b, a conduit 116a and The second chamber of the reservoir 110 communicates with the joint 112b.

  On the other hand, of the third and fourth moving quick joints 126c and 126d communicating with the outlet passage 124, the fourth moving quick joint 126d is coupled to the fourth stationary quick joint 132d forming the first port, The third moving quick joint 126c is separate from the third stationary quick joint 132c forming the second port (see FIG. 5). Accordingly, the third stationary quick joint 132c is closed, and the outlet passage 124 is connected to the reservoir 110 via the fourth moving quick joint 126d, the fourth stationary quick joint 132d, the three-way joint 118b, the conduit 114a, and the joint 112a. To the first chamber.

  When the slider 120 is in the second position, the first and fourth static quick joints 132a, 132d communicate with the sprayer, and the second and third static quick joints 132b, 132c communicate with the paint source. A high voltage is applied between the first and third stationary quick joints 132a and 132c and between the second and fourth stationary quick joints 132b and 132d. The stationary shielding members 134a to 134d prevent leakage or discharge between the adjacent first and third stationary quick joints 132a and 132c and between the second and fourth stationary quick joints 132b and 132d.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Since the second embodiment is formed in substantially the same manner as the first embodiment, only differences from the first embodiment will be described below.

  7 and 8, the voltage interrupting device 200 includes an attachment plate 202 for attaching the voltage interrupting device 200 to a frame member of an electrostatic coating system or a pillar of a painting factory where the electrostatic coating system is installed. . A base member 204 is fixed to the mounting plate 202. A slider 206 similar to the slider 120 is slidably attached to the base member 204, and can be linearly moved between the first and second positions, as in the first embodiment.

  In the second embodiment shown in FIGS. 7 and 8, the voltage breaker 200 has the first to fourth moving shielding members 128 a to 128 d and the first to fourth stationary shielding members 134 a to 134 d in the first embodiment. In addition, it is formed in the same manner as in the first embodiment except that an auxiliary shielding member is provided. The auxiliary shielding member includes stationary shielding members 208 a and 208 b attached to the base member 204, and moving shielding members 210 a and 210 b attached to the slider 206. Each of the stationary shielding members 208a, 208b has a recess 209a, 209b for receiving each of the moving shielding members 210a, 210b. When the slider 206 is in the first position, the stationary shielding member 210a is received in the recess 209a. When the slider 206 is in the second position, the stationary shielding member 210b is received in the recess 209b.

1 is a block diagram of an electrostatic coating system according to a preferred embodiment of the present invention. 1 is a schematic diagram illustrating a first position of a voltage interrupt device according to a first embodiment of the present invention. 1 is a schematic diagram illustrating a first position of a voltage interrupt device according to a first embodiment of the present invention. 2 is a schematic diagram illustrating a second position of the voltage interrupt device according to the first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a second position of the voltage interrupt device according to the first embodiment of the present invention. FIG. 1 is a schematic perspective view of a slider of a voltage breaker according to a preferred embodiment of the present invention. It is a schematic plan view of a voltage interrupt device according to a second embodiment of the present invention. It is a side view of the voltage interruption device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrostatic coating system 12 Sprayer 16 Tank 18 1st pump 20 1st supply line 22 2nd supply line 24 Pump 26 Voltage shut-off device 28 Reservoir 40 Switch

Claims (12)

In an electrostatic coating system in which a cathode voltage is applied to paint supplied from a paint source to a sprayer and sprayed toward an object to which a positive voltage is applied, the cathode voltage is prevented from being transmitted to the paint source. In the voltage breaker,
A switch provided with a slider that is selectively movable linearly between the first and second positions and has an inlet port communicating with the paint source and an outlet port communicating with the sprayer;
A reservoir having first and second chambers;
When the slider is in the first position, the inlet port communicates with the first chamber, and the outlet port communicates with the second chamber;
When the slider is in the second position, the voltage cutoff device is configured such that the inlet port communicates with the second chamber and the outlet port communicates with the first chamber.   The reservoir includes a cylinder and a double-headed piston slidably disposed in the cylinder, and the first and second cylinders are formed in the cylinder by an inner wall of the cylinder and an end of the double-headed piston. The voltage interrupt device of claim 1, wherein the chamber is defined. The slider is formed with an inlet passage and an outlet passage forming the inlet port and the outlet port, and a pair of opposing surfaces formed in a direction transverse to the moving direction of the slider,
The voltage interrupting device is further attached to one of the pair of surfaces of the slider and is connected to the inlet passage and the outlet passage, respectively.
Second and fourth moving quick joints attached to the other of the pair of surfaces of the slider and communicating with the inlet passage and the outlet passage, respectively;
First and second stationary quick couplings respectively communicating with the first and second chambers of the reservoir;
Comprising third and fourth stationary quick couplings communicating with the second and first chambers of the reservoir;
When the slider is in the first position, the first and third mobile quick joints are coupled to the first and third stationary quick joints, and the second and fourth mobile quick joints are the first Away from the second and fourth stationary quick joints,
When the slider is in the second position, the first and third moving quick joints are separated from the first and third stationary quick joints, and the second and fourth moving quick joints are 2. The voltage interrupt device of claim 1 coupled to the second and fourth stationary quick joints.   4. The voltage cutoff device according to claim 3, further comprising a moving shielding member attached to a pair of surfaces of the slider so as to surround the first to fourth moving quick joints.   The voltage interruption device according to claim 4, further comprising a stationary shielding member disposed so as to surround the first to fourth stationary quick joints.   The voltage breaker further includes an auxiliary shielding member attached between the first and third moving quick joints and between the second and fourth moving quick joints on each of the pair of surfaces of the slider. The voltage interruption device according to claim 5 provided. A paint source,
A sprayer for spraying paint from the paint source to which a cathode voltage is applied;
An electrostatic coating system comprising a voltage cutoff device for preventing the cathode voltage from being transmitted to the paint source, and spraying toward an object to which a positive voltage is applied;
The voltage breaker is
A switch provided with a slider that is selectively movable between first and second positions and has an inlet port communicating with the paint source and an outlet port communicating with the sprayer;
A reservoir having first and second chambers;
When the slider is in the first position, the inlet port communicates with the first chamber, and the outlet port communicates with the second chamber;
An electrostatic coating system, wherein when the slider is in a second position, the inlet port communicates with the second chamber and the outlet port communicates with the first chamber.   The reservoir includes a cylinder and a double-headed piston slidably disposed in the cylinder, and the first and second cylinders are formed in the cylinder by an inner wall of the cylinder and an end of the double-headed piston. The electrostatic coating system of claim 7, wherein the chamber is defined. The slider is formed with an inlet passage and an outlet passage forming the inlet port and the outlet port, and a pair of opposed surfaces formed in a direction transverse to the moving direction of the slider,
The voltage interrupting device is further attached to one of the pair of surfaces of the slider and is connected to the inlet passage and the outlet passage, respectively.
Second and fourth moving quick joints attached to the other of the pair of surfaces of the slider and communicating with the inlet passage and the outlet passage, respectively;
First and second stationary quick couplings respectively communicating with the first and second chambers of the reservoir;
Comprising third and fourth stationary quick couplings communicating with the second and first chambers of the reservoir;
When the slider is in the first position, the first and third mobile quick joints are coupled to the first and third stationary quick joints, and the second and fourth mobile quick joints are the first Away from the second and fourth stationary quick joints,
When the slider is in the second position, the first and third moving quick joints are separated from the first and third stationary quick joints, and the second and fourth moving quick joints are The electrostatic coating system of claim 7, coupled to the second and fourth stationary quick joints.   The electrostatic coating system according to claim 9, wherein the voltage interrupting device further comprises a moving shielding member attached to a pair of surfaces of the slider so as to surround the first to fourth moving quick joints. .   The electrostatic coating system according to claim 10, wherein the voltage interrupting device further comprises a stationary shielding member disposed so as to surround the first to fourth stationary quick joints.   The voltage breaker further includes an auxiliary shielding member attached between the first and third moving quick joints and between the second and fourth moving quick joints on each of the pair of surfaces of the slider. The electrostatic coating system according to claim 11 provided.

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