JPH0580548U - Insulation structure of electrostatic coating equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] The insulating tube can be easily and quickly cleaned, and it is possible to maintain a reliable electrical insulation state and perform efficient electrostatic coating work. An insulating pipe body 34 having a predetermined length and extending vertically downward, and a first switching valve 3 capable of selectively communicating the upper end of the insulating pipe body 34 with a paint supply source and a cleaning valve (not shown).
6, a lower end of the insulating pipe 34, the storage portion 24 and the waste liquid tank 38 are selectively communicable with each other, and the second switching valve 40 and the waste liquid tank 38 are communicated with each other. The discharge path 42 extends vertically downward from the second switching valve 40 toward the waste liquid tank 38.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insulating structure used in an electrostatic coating device that performs electrostatic coating by directly applying a high voltage to conductive coating.

[0002]

[Prior Art]

 Conventionally, a paint color changing system disclosed in, for example, Japanese Patent Application Laid-Open No. 2-2885 is used as an electrostatic coating device for directly applying a high voltage to a conductive coating to electrostatically coat an object to be coated such as an automobile body. It has been known.

In this conventional technique, the conductive coating material is once introduced into an intermediate storage tank (reservoir) which is insulated from the ground potential, and then a high voltage is directly applied to the intermediate storage tank from which the object to be coated is coated. The electrostatic coating work is performed by being supplied.

In this case, a block valve mechanism is used to electrically insulate the intermediate storage tank for temporarily storing the conductive paint and the paint supply source at the ground potential. Generally, this block valve mechanism is provided with an insulating pipe body having a predetermined length, and through the insulating pipe body under the switching action of switching valves connected to both ends of the insulating pipe body. After the paint is supplied from the paint supply source to the intermediate storage tank, the insulating pipe is washed with a cleaning liquid and dried to maintain the electric insulation between the intermediate storage tank and the paint supply source. There is.

[0005]

[Problems to be solved by the device]

 By the way, in the above block valve mechanism, the cleaning liquid used for cleaning the insulating pipe body is discharged to the waste liquid tank through the discharge path communicating with the insulating pipe body under the action of the switching valve. At that time, the discharge route is often arranged in various directions due to the arrangement space of various devices. Therefore, for example, if the insulating pipe is arranged vertically downward, while the discharge path is arranged vertically upward, the insulating pipe is supplied downward from above. The cleaning liquid thus made flows through the discharge path from bottom to top. Therefore, the cleaning liquid cannot smoothly flow through the discharge path, and it becomes difficult to discharge a large amount of the cleaning liquid in a short time, and the cleaning time becomes considerably long. As a result, it is pointed out that the cycle time of the entire electrostatic coating work cannot be shortened and the electrostatic coating work cannot be efficiently performed.

The present invention solves this kind of problem, and the insulating tube can be easily and quickly cleaned, and the reliable electrical insulation state can be maintained to achieve efficient electrostatic coating. It is an object of the present invention to provide an insulating structure for an electrostatic coating device that can perform work.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is used in an electrostatic coating apparatus that directly applies a high voltage to a conductive coating to perform electrostatic coating, and electrically insulates the coating supply source and the intermediate storage tank. And an insulating tube body having a predetermined length, a first switching valve mechanism capable of communicating one end of the insulating tube body with the paint supply source and the cleaning valve, and the insulating tube body. A second switching valve mechanism capable of selectively communicating the other end of the intermediate storage tank and the waste liquid tank, the second switching valve mechanism and the waste liquid tank, and the second switching valve mechanism from the waste liquid tank. And a discharge path extending vertically downward toward the side.

[0008]

[Action]

 In the insulating structure of the electrostatic coating apparatus according to the present invention, the paint supplied from the paint supply source to the insulating pipe body via the first switching valve mechanism is supplied from the second switching valve mechanism to the intermediate storage tank overnight. After that, the first and second switching valve mechanisms are switched, a cleaning liquid is supplied to the insulating pipe from the cleaning valve, and the insulating pipe is cleaned, and the waste liquid passes through the discharge path to form the waste liquid. It is discharged to the tank. At that time, the discharge path extends vertically downward from the second switching valve mechanism toward the waste liquid tank side, and the waste liquid can smoothly flow vertically downward along the discharge path. For this reason, a large amount of cleaning liquid can be discharged in a short time, and the cleaning work of the insulating pipe body can be made efficient at once.

[0009]

【Example】

 An insulating structure of an electrostatic coating device according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, reference numeral 10 indicates an electrostatic coating apparatus, and this electrostatic coating apparatus 10 is an intermediate storage connected to a color change valve mechanism or the like (not shown) incorporating the insulating structure according to the present embodiment. A tank 12 is provided, and this intermediate storage tank 12 is connected to a coating gun 16 via a four-way switching valve 14 and is fixed in a standing state by a holding device 18.

As shown in FIG. 1, the intermediate storage tank 12 has a manifold base 22 formed of an electrically insulating material, and a manifold base 22 having a pipe connection portion 20 capable of piping a plurality of pipes from the outside, and the manifold. The storage unit 24 that is provided integrally with the base 22 and temporarily stores the conductive paint, the insulating structure 30 according to the present embodiment, and the equipment including the insulating structure 30 are covered to cover the manifold base 22. And cover members 32a, 32b made of an electrically insulating material to be attached to the.

The insulating structure 30 has an insulating pipe 34 having a predetermined length and extending substantially vertically downward, and an upper end of the insulating pipe 34 and a paint supply source and a cleaning valve (not shown) are selectively communicated with each other. A self-existing first switching valve (switching valve mechanism) 36, and a second switching valve (switching valve mechanism) 40 capable of selectively communicating the lower end of the insulating pipe 34 with the storage section 24 and the waste liquid tank 38. The second switching valve 40 and the waste liquid tank 38 are connected to each other, and a discharge path 42 extending vertically downward from the second switching valve 40 toward the waste liquid tank 38 side is provided.

The first switching valve 36 is a three-way switching valve, and has a first introduction port 44 that communicates with the paint supply source, a second introduction port 46 that communicates with the cleaning valve, and an upper end of the insulating pipe 34. And a first outlet port 48 connected to the. The second switching valve 40 includes a third introduction port 50 that communicates with the lower end of the insulating pipe 34, a second derivation port 52 that communicates with the reservoir 24, and a third derivation port that communicates with the waste liquid tank 38. And 54.

As shown in FIG. 3, the third inlet port 50 and the third outlet port 54 are provided substantially coaxially in the vertical direction, and the passage 56 communicating with the third inlet port 50 has a hole. It is possible to communicate with the third outlet port 54 via the portion 58 and the inclined passage 60, and also with the second outlet port 52 via the hole portion 62. A rod 64 is arranged in the second switching valve 40 so as to be capable of advancing and retracting in the horizontal direction, and holes 58 and 62 are alternately opened and closed by the first and second valve bodies 66 and 68 provided on the rod 64. It is configured to be possible.

The discharge path 42 is made of an electrically insulating material, and is arranged on the same straight line as the insulating tube 34 in a vertically downward direction. The lower end side of the discharge path 42 is held by a holding means 70 attached to the cover member 32b. The distance L between the second switching valve 40 of the discharge path 42 and the end surface of the cover member 32b is set to a creeping distance that can insulate the high voltage directly applied to the conductive paint.

The manifold base 22 is integrally provided with an outer wall portion 74 of the storage portion 24 and equipment attachment portions 76a to 76d in addition to the pipe body connecting portion 20, and both ends of the pipe body connecting portion 20 are provided. The screw parts 78a and 78b for fixing the cover members 32a and 32b are formed on the. The first and second switching valves 36 and 40 forming the insulating structure 30 are fixed to the device mounting portions 76a and 76b.

The storage section 24 includes a metal cylinder 80, and a first cylinder chamber 84 for injecting a paint and a cleaning liquid via a piston 82 that is slidably displaced along the inner wall surface of the metal cylinder 80, and an air supply. The second cylinder chamber 86 for use is formed separately. A cylindrical detection rod 88 extending to the outside of the storage portion 24 is provided on the piston 82, and a tank 90 for storing the cleaning fluid is provided above the detection rod 88. The dog member 92 is fixed to a predetermined position of the detection rod 88, and the dog portion 93 is formed in the tank 90. The dog member 92 and the dog portion 93 engage with the detection means 94. The detecting means 94 is provided with opening / closing valves 96a and 96b which are engaged with the dog member 92 and the dog portion 93 and driven to be switched. It is fixed to the equipment mounting portion 76c. A flow rate control valve 100, which communicates with the first cylinder chamber 84 of the storage section 24 and adjusts the discharge amount of the paint, is fixed to the equipment mounting portion 76d of the manifold base 22.

The pipe body connection portion 20 formed at the end of the manifold base 22 is connected to the paint supply port 102 that communicates with the first introduction port 44 of the first switching valve 36 and the second introduction port 46. The cleaning liquid supply port 104, the outlet port 108 for communicating the first cylinder chamber 84 with the four-way switching valve 14 via the delivery passage 106, and the drive fluid port (not shown) for the piston 82 and the on-off valves 96a, 96b. No.) etc. are provided (see FIGS. 1 and 2). The manifold base 22 is provided with a paint passage 110 for communicating the second outlet port 52 of the second switching valve 40 with the first cylinder chamber 84 of the storage section 24.

The holding device 18 is provided on the outer wall portion of the intermediate storage tank 12, bolt members 112 a and 112 b, a frame body 114 having an outer shape corresponding to the intermediate storage tank 12, and the frame body 114. And groove portions 116a and 116b for engaging the bolt members 112a and 112b to hold the intermediate storage tank 12 in an upright position, and the frame body 114 is provided on a wall surface (not shown) in the workplace. It is fixed.

Next, the operation of the electrostatic coating device 10 thus configured will be described.

First, when a paint of a predetermined color is pressure-fed to the paint supply port 102 from a color change valve mechanism (not shown), the paint is passed from the first switching valve 36 through the first introduction port 44 to the insulating pipe 34. Is supplied to the second switching valve 40 through the flow path and is filled from the paint flow path 110 into the first cylinder chamber 84 of the storage section 24. The paint with which the first cylinder chamber 84 is filled is sent from the flow rate control valve 100 to the four-way switching valve 14 via the outlet 108 and the delivery passage 106, and then the paint gun 16 is filled. At that time, the piston 82 rises and the dog member 92 engages with the on-off valve 96a, so that the filling of the paint is automatically detected.

Next, drive air is supplied from an air supply source (not shown), and the switching operation of the first and second switching valves 36 and 40 that configure the insulating structure 30 is performed. Therefore, the cleaning liquid supplied from the cleaning valve is supplied from the cleaning liquid supply port 104 to the first switching valve 36 via the second introduction port 46, and further, the third introduction of the second switching valve 40 from the insulating pipe 34. It is supplied to the port 50. Here, as shown in FIG. 3, the rod 64 retracts and the first valve body 66 opens the hole 58, while the second valve body 68 closes the hole 62. Therefore, the coating material supplied to the third introduction port 50 flows from the passage 56 through the hole 58 and the inclined passage 60 to the third outlet port 54, and is further discharged to the waste liquid tank 38 through the discharge path 42. It Then, the insulating structure 30 is dried, so that the color change valve mechanism and the intermediate storage tank 12 are electrically insulated.

Here, the piston 82 is displaced to the first cylinder chamber 84 side by the driving air supplied from the air supply source, the discharge amount of the paint is adjusted by the flow control valve 100, and the high voltage is applied. Is directly applied to the work (not shown) from the coating gun 16. At that time, the piston 82 moves toward the first cylinder chamber 84 side and the dog portion 93 engages with the on-off valve 96b, whereby the movement information of the piston 82 is automatically detected.

As described above, in the present embodiment, the discharge path 42 is arranged vertically downward, and its upper end communicates with the third outlet port 54 of the second switching valve 40, while The lower end communicates with the waste liquid tank 38 side. Therefore, the cleaning liquid used for cleaning the insulating pipe body 34 can smoothly flow vertically downward from the third outlet port 54 of the second switching valve 40 along the discharge path 42. Therefore, it becomes possible to supply a large amount of cleaning liquid and drying air in a short time, so that the cleaning and drying work of the insulating structure 30 can be efficiently and surely performed all at once, and particularly the entire coating work can be performed. The effect is that the cycle time can be shortened.

Further, in this embodiment, the insulating pipe 34 extends vertically downward from the first switching valve 36 toward the second switching valve 40, and the insulating pipe 34 and the discharge path 42 are substantially the same. They are arranged on a straight line. Therefore, there is almost no bent portion in the cleaning liquid path connecting the insulating pipe 34 to the discharge route 42, and the cleaning liquid supplied from the first switching valve 36 to the insulating pipe 34 is It has the advantage that it can flow more smoothly from the body 34 through the discharge path 42.

In addition, in the present embodiment, the first and second switching valves 36, 40 that constitute the insulating structure 30 are three-way switching valves, but the invention is not limited to this, and for example, the first It is also possible to use a plurality of two-way switching valves instead of the second switching valves 36 and 40. It should be noted that if the number of switching valves is large, the cleaning property of the entire insulating structure is likely to be deteriorated. Furthermore, although an example in which the paint supply source and the cleaning valve are provided separately has been shown, it is possible to integrate these and connect them by a single path.

[0027]

[Effect of the device]

 The insulating structure of the electrostatic coating device according to the present invention has the following effects.

After the paint is supplied to the intermediate storage tank through the insulating pipe body, when the insulating pipe body is washed, the cleaning liquid used for the cleaning work is arranged vertically downward. It is possible to smoothly flow vertically downward through the discharge path. For this reason, a large amount of cleaning liquid can be discharged in a short time, the cleaning work of the insulating pipe can be made efficient at once, and the cycle time of the entire coating work can be easily shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of an intermediate storage tank adopting an insulating structure of an electrostatic coating device according to the present invention.

FIG. 2 is a schematic perspective view of the electrostatic coating device and the holding device.

FIG. 3 is a vertical cross-sectional side view of a switching valve that constitutes the insulating structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electrostatic coating device 12 ... Intermediate storage tank 16 ... Coating gun 22 ... Manifold base 24 ... Storage part 30 ... Insulation structure 34 ... Insulation pipe body 36, 40 ... Switching valve 42 ... Discharge path 44, 46 ... Introduction port 48 Derivation port 50 ... Introduction port 52, 54 ... Derivation port 76a to 76d ... Equipment mounting portion 82 ... Piston 84, 86 ... Cylinder chamber

Front page continuation (72) Inventor Shinsei Arai 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. In the company

Claims (2)

[Scope of utility model registration request] 1. An insulating structure for electrically insulating a paint supply source and an intermediate storage tank, which is used in an electrostatic coating device for electrostatically coating a high voltage directly on a conductive paint. An insulating pipe body having a predetermined length, a first switching valve mechanism capable of communicating one end of the insulating pipe body with the paint supply source and the cleaning valve, the other end of the insulating pipe body and the intermediate storage tank And a second switching valve mechanism capable of selectively communicating with the waste liquid tank, the second switching valve mechanism and the waste liquid tank are connected, and the second switching valve mechanism extends vertically downward from the second switching valve mechanism toward the waste liquid tank side. An insulating structure of an electrostatic coating device, comprising: an extending discharge path. 2. The insulating structure according to claim 1, wherein the insulating pipe extends vertically downward from the first switching valve mechanism toward the second switching valve mechanism, and is arranged substantially on the same straight line as the discharge path. Insulation structure of electrostatic coating device characterized by being applied.