JP2006263607A - Insulating apparatus for coating-material pipe line and coating apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating apparatus for coating-material pipe line capable of forming a good insulating part hardly causing the deterioration of electric insulation property in the middle of the coating-material pipe line. <P>SOLUTION: In the insulating apparatus for coating-material pipe line, a cleaning means 32, 32a for cleaning a part S to be insulated in the middle of the coating-material pipe lines 4a, 4b, 13a, 13b by passing a cleaning liquid L in place of a coating material T and insulating part forming means 42a, 42b, 43a, 43b for forming the insulating part S where an insulating fluid having electric insulation property is filled in the part S to be insulated in a state free from the flow of the coating material are provided. A cleaning pig 41 freely movable in the pipe line longitudinal direction is internally mounted in the part S to be insulated to be in slide-contact with the inside surface of the part S to be insulated. A pig housing part 45 housing the pig 41 to hold the pig 41 aside from the coating material flow passage is provided in one end part of the part S to be insulated and pig operating means 42a, 42b, 43a, 43b for moving the pig 41 from the pig housing part 45 to another end part of the part S to be insulated are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an insulating device for a paint pipe line and a coating apparatus using the same, and more specifically, the part to be insulated in the middle of the paint pipe line through which the paint is passed is cleaned by passing a cleaning liquid instead of the paint. An insulating device for a paint pipe line provided with an insulating part forming means for forming an insulating part filled with an electrically insulating insulating fluid in the insulating target part in a state where the paint flow is cut off. And it is related with the coating device using the same.

  In the insulating device for a paint pipe as described above, when it is necessary to prevent electrical leakage through the conductive paint in the paint pipe, the part to be insulated in the middle of the paint pipe is washed by flowing a cleaning liquid, By forming the insulating portion (that is, the portion filled with the insulating fluid) in the portion to be insulated after the cleaning, the conductive paint in the paint pipeline is cut off in the insulation portion, and thereby in the paint pipeline. Conventionally, in this type of paint pipe insulation device, the above-mentioned insulating portion is formed by the flow of cleaning liquid such as water and thinner in the cleaning process prior to this. Next, let the cleaning air that removes the residual cleaning liquid flow to the part to be insulated, so that the cleaning air to be passed at the end of the cleaning process is passed to the part to be insulated by closing the gate valves before and after the part to be insulated. Containment In its containment air to form an insulating portion as dielectric fluid (e.g., see Patent Document 1).

Japanese Patent No. 2555431

  However, as described above, the conventional paint pipe insulation device that forms an insulating portion by simply containing the cleaning air following the cleaning by the flow of the cleaning liquid and the cleaning air can be completely removed by the flow of the cleaning liquid. The cleaning liquid that could not be removed by the flow of paint or cleaning air that remained was left in the insulation (that is, the part to be insulated that contained the cleaning air), or the solvent vapor of the residual paint or the residual cleaning liquid vapor There is a problem that the insulating portion may remain in a diffused state, and the electrical insulating property of the insulating portion may be lowered due to this.

  Further, in order to avoid such deterioration of electrical insulation due to the residue and to ensure high electrical insulation of the insulating part, the cleaning liquid and the cleaning air are used in the cleaning process prior to the formation of the insulating part by containing the cleaning air. Must be passed through the portion to be insulated for a considerably long time, which causes a problem that the formation of the insulating portion is delayed and the transition to the process after the formation of the insulating portion is delayed.

  In view of this situation, the main object of the present invention is to effectively solve the above-described problems by forming the insulating portion with a rational formation form.

[1] A first characteristic configuration of the present invention relates to an insulating device for a paint pipe,
In addition to providing a cleaning means for cleaning the part to be insulated in the middle of the paint pipeline through which the paint flows by the flow of cleaning liquid instead of the paint,
In the structure provided with the insulating part forming means for forming the insulating part filled with the insulating fluid having electrical insulating property in the insulating target part in a state where the paint flow is cut off,
A cleaning pig that is movable in the longitudinal direction of the pipe in a state of sliding in contact with the inner surface of the insulation target part is internally provided in the insulation target part,
A pig storage part for storing the pig in a state where it is retracted from the paint flow path is provided at one end of the part to be insulated,
A pig operating means for moving the pig over the pig storage part and the other end of the part to be insulated is provided.

  In other words, according to the first characteristic configuration, following the cleaning by the flow of the cleaning liquid, the cleaning pig is moved in the longitudinal direction of the pipe by the pig operating means in the part to be insulated, so that the pig on the inner surface of the part to be insulated is moved. Residue in the part to be insulated with this sliding contact (that is, paint that could not be removed by the flow of cleaning liquid, residual cleaning liquid after flow, or solvent vapor of residual paint or vapor of residual cleaning liquid, etc.) mechanically It can be removed from the part to be insulated, and the residue in the part to be insulated can be more reliably and more efficiently compared to simply passing the cleaning air following the flow of the cleaning liquid in the cleaning process as in the conventional device described above. Can be removed.

  Therefore, if the insulating portion is filled with the insulating fluid by the insulating portion forming means after the residue removal by the pig movement to form the insulating portion, the insulating property is less likely to be deteriorated by the residue than the conventional device. Insulating parts can be reliably formed, and the removal of residues is efficient, so that the time required for the cleaning process including the moving operation of the pig can be shortened compared to the conventional device. Transition to the process after the formation of the part can also be made quick.

  In addition, a pig storage part for storing the pig in a state where it is retracted from the paint flow path of the part to be insulated is provided at one end part of the part to be insulated, and the pig storage part on one end side and the other end part of the part to be insulated are provided. Since the pig can be moved over and over, the structure where the part to be insulated is equipped with a pig, the flow of paint or cleaning liquid to the part to be insulated is stored in the pig storage part by the pig operating means. Thus, by leaving the part to be insulated from the paint flow path, it can be performed in the same manner as before, and the paint flow characteristic of the paint pipe line and the flow characteristic of the cleaning liquid are not impaired.

  In the implementation of the first characteristic configuration, the insulating fluid forming the insulating portion is not limited to air, and various gases or various liquids may be used as long as they have practically sufficient electrical insulation. it can.

  In addition, the formation of the insulating portion filled with the insulating fluid is not limited to the form in which the insulating fluid is sealed in the portion to be insulated, and the insulating fluid is continuously or intermittently applied to the portion to be insulated with the pig stored in the pig storage portion. You may make it take the form made to flow through.

  As in the conventional apparatus, the cleaning means may be configured to flow a cleaning gas (for example, air) following the flow of the cleaning liquid in the cleaning process, or may omit the cleaning gas flow in the cleaning process. Only the cleaning liquid may be allowed to flow.

  The pig storage unit is not limited to being provided only at one end of the part to be insulated, but in some cases, the pig storage part is provided at both ends of the part to be insulated, and the pigs are alternately or depending on the situation for the two pig storage parts. Alternatively, it may be stored.

  A typical example of a paint pipe line for providing a portion to be insulated is a paint supply path to a paint gun in a coating apparatus, but is not limited to this. For example, a paint transport pipe to a tank or the like It may be.

[2] The second characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the first characteristic configuration.
The pig operating means is configured to move the pig from the pig storage to the other end of the part to be insulated by pressing with the pig operating fluid by supplying the pig operating fluid with pressure to the pig storage, and By the pressurized supply of the pig operating fluid to the other end of the part to be insulated, the pig is moved from the other end of the part to be insulated to the pig storage by pressing with the pig operating fluid. .

  That is, according to the second feature configuration, the portion to be insulated is a cylinder chamber and the pig is a piston, and the pig storage portion and the other end of the portion to be insulated are selectively pressurized. Since the pig is moved in the longitudinal direction of the pipe inside the portion to be insulated by pressing with the pig operating fluid to be supplied, for example, the device around the portion to be insulated is compared with a configuration in which the pig is moved by a mechanical drive mechanism. The structure can be simplified.

  In the implementation of the second characteristic configuration, the pig operating fluid may be the same fluid as the insulating fluid or a fluid different from the insulating fluid, but the same fluid as the insulating fluid as the pig operating fluid ( For example, if air is used, formation of the insulating portion (that is, formation of the insulating fluid filling portion) following the pig moving operation by the pig operating fluid can be performed more efficiently.

[3] The third characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the second characteristic configuration.
While connecting the pressurized supply path of the pig operation fluid to both ends of the insulation target portion formed of a straight pipe, and installing an on-off valve in each of the pressurized supply path on one end side and the other end side,
Either the upstream side portion or the downstream side portion of the paint pipe line with respect to the insulation target part is arranged in the longitudinal direction of the pipe of the insulation target part with respect to the connection portion of the pressure supply path with respect to one end of the insulation target part. It is in a point near the center and connected to one end of the portion to be insulated in a direction orthogonal to the tube core of the portion to be insulated.

  That is, in this third characteristic configuration, either the upstream side portion or the downstream side portion of the paint pipe line with respect to the insulation target portion is placed closer to the insulation target portion than the connection portion of the pressure supply path to one end of the insulation target portion. By connecting to one end of the part to be insulated at a location closer to the center in the longitudinal direction of the pipeline, the connection place of the pressure supply path and the connection part between the upstream part or the downstream part of the paint pipe at one end of the part to be insulated The part between the two is a pig storage part that is out of the paint flow path.

  In addition, by selectively operating the on-off valve with respect to one end of the portion to be insulated (that is, the back end of the pig storage portion) and the other end through the pressurized supply path of the pig operating fluid connected to both ends of the portion to be insulated. By supplying the pig operating fluid under pressure, the pig is moved across one end (that is, the pig storage portion) and the other end of the insulation target portion by being pressed by the pig operating fluid.

  And, the paint pipe upstream side portion or the downstream side portion is connected to one end portion of the insulation target portion at a position closer to the center in the pipe longitudinal direction of the insulation target portion than the connection portion of the pressure supply path to one end of the insulation target portion. To connect, connect the upstream part or downstream part of the paint pipe to one end of the part to be insulated in a direction orthogonal to the tube core of the part to be insulated, and also make the part to be insulated straight. Thus, when moving the pig from the other end of the part to be insulated to the pig storage part at one end by pressing with the pig operating fluid, the paint pipe upstream side part connected to the one end of the part to be insulated or the downstream side It is possible to prevent the pig from being inadvertently entered into the side portion side, so that the pig can be smoothly and reliably stored in the pig storage portion at one end of the portion to be insulated.

  In other words, this allows the pig to be stored in the pig storage part that is out of the paint flow path and allows the paint or cleaning liquid to flow through the insulation target part smoothly and reliably. Therefore, it is possible to effectively prevent the occurrence of troubles such as the inability to flow the paint or the cleaning liquid due to the poor storage of the pig, and in this respect, the device can be made more reliable in operation.

  In the implementation of the third feature configuration, a pressure supply path for the pig operating fluid is connected to both ends of the part to be insulated, and an opening / closing valve is interposed in each of the pressure supply paths on one end side and the other end side. In doing so, there are various forms such as a two-way valve interposed in the middle of each of the pressure supply paths, or a three-way valve interposed in a portion branching the pressure supply path from the main pressure supply path The valve equipment form can be taken.

[4] A fourth characteristic configuration of the present invention relates to a coating apparatus using the paint pipe line insulating device according to any one of the first to third characteristic configurations.
It is equipped with a paint gun that discharges paint that is pressurized and supplied from a feed tank by pressure feeding means in a charged state by applying voltage.
The paint gun is connected to the paint discharge passages of each of the plurality of feed tanks, and a tank switching valve for selectively switching a feed tank for supplying paint to the paint gun among the feed tanks is provided.
Filling that selectively connects a supply tank to be filled with paint from the paint filling path among a plurality of the supply tanks while connecting a branch filling path branched from the paint filling path to each of the supply tanks A switching valve, and a paint switching valve for switching the paint type of the paint to be filled in the supply tank through the paint filling path,
In this configuration, the part to be insulated provided with the pig storage unit and the pig operation means is provided in each of the paint discharge path and the branch filling path as the paint pipeline,
The cleaning means and the insulating part forming means for the parts to be insulated are provided.

  That is, in the coating apparatus having the fourth characteristic configuration (see FIG. 1), the paint T supplied through the paint discharge passages 4a and 4b from any one of the supply tanks 3A and 3B selected by the tank switching valves 11a and 11b is applied. While discharging from the gun 1, the paint switching valves 27a, 30b pass the paints Ta-Tn selected by the paint switching valves 30a-30n through the paint filling passage 13 and the branch filling passages 13a, 13b for the feed tanks 3A, 3B. An operation mode in which the other supply tanks 3A and 3B selected by 27b are filled is adopted.

  Further, the insulation target portions S are provided in the paint discharge paths 4a and 4b from the respective feed tanks 3A and 3B and the branch filling paths 13a and 13b for the respective feed tanks 3A and 3B. Equipped with cleaning means for S and insulation forming means, switching according to switching of supply tanks 3A, 3B for supplying paint to coating gun 1 and switching of supply tanks 3A, 3B to be filled with paint The insulation target portion S provided in the branch filling passages 13a and 13b to the feed tanks 3A and 3B for supplying paint to the paint gun 1 later, and the paint discharge passages of the feed tanks 3A and 3B to be filled with paint after switching The voltage applied by the paint gun 1 through the conductive paint T in the paint path is formed by selectively forming an insulation part of the insulation fluid in the part S to be insulated provided in 4a and 4b. To the upstream side of the coating path to prevent the far-leakage manner.

  And according to this 4th characteristic structure, since each said insulation object part S provided in each part employ | adopts the above-mentioned 1st characteristic structure (equipment of a pig interior, a pig storage part, and a pig operation means), it is mentioned above. Compared to forming an insulating part by simply enclosing the cleaning air in the part to be insulated following the flow of the cleaning liquid and the cleaning air using the conventional paint pipe insulating device, the insulating part is insulated. Residues in the target part can be removed more reliably and efficiently, and a good insulating part with less risk of deterioration of insulation due to the residue can be reliably formed. It is possible to make the coating device more excellent in safety.

  In addition, the efficient removal of residues can reduce the time required for the cleaning process, including the operation of moving the pig, which enables the painting work to be performed while switching the supply tank that supplies the paint to the paint gun. The work efficiency can be further increased.

  In this type of coating equipment, the paint filling is performed by feeding the cleaning liquid from the paint switching valve side when the supply tank for supplying paint to the coating gun is switched and when the supply tank to be filled with paint is switched. Since the cleaning at the time of switching for cleaning the path, the branch filling path, the feed tank, and the paint discharge path is generally performed, in the implementation of the fourth characteristic configuration, the configuration of the cleaning at the time of switching is cleaned for each part to be insulated. It is desirable to use it as a means.

[5] A fifth characteristic configuration of the present invention relates to an insulating device for a paint pipe,
In addition to providing a cleaning means for cleaning the part to be insulated in the middle of the paint pipeline through which the paint flows by the flow of cleaning liquid instead of the paint,
In the structure provided with the insulating part forming means for forming the insulating part filled with the insulating fluid having electrical insulating property in the insulating target part in a state where the paint flow is cut off,
In order to constitute the insulating portion forming means, a gate valve is interposed at each of both end portions of the insulating target portion in the paint pipeline,
An insulating liquid supply path for supplying an insulating liquid having electrical insulation as the insulating fluid to the insulating target part, and an insulating drain path for discharging the insulating liquid from the insulating target part. In a state in which the connection location for the part is separated in the longitudinal direction of the pipe line, connected to the part to be insulated between the gate valves,
An on-off valve is interposed in the insulating liquid supply path and the insulating drain path.

  That is, in the fifth feature configuration, following the cleaning by the flow of the cleaning liquid, the insulating target portion is opened by opening the on-off valve and supplying the insulating liquid from the insulating liquid supply path and discharging the insulating liquid from the insulating drain path. (Strictly speaking, by passing an insulating liquid through a portion between the connection points of both paths), the insulating portion is filled with the insulating liquid in a fluid state to form an insulating portion.

  Accordingly, in the formation of the insulating portion, residues in the insulation target portion (that is, paint that could not be completely removed by flowing cleaning liquid, residual cleaning liquid after flowing, or solvent vapor of residual paint or residual cleaning liquid vapor) The insulating liquid can be removed from the part to be insulated by the above-mentioned flow of the insulating liquid, and the insulating part can be simply sealed in the part to be insulated as the insulating fluid by the gate valves before and after the part to be insulated as in the conventional device described above. Compared to forming the insulating material, it is possible to more reliably and efficiently remove the residue in the portion to be insulated in the process of forming the insulating portion.

  Therefore, it is possible to reliably form a good insulating part that is less likely to be deteriorated in insulation due to the residue compared to the conventional device, and to remove the residue reliably and efficiently in the process of forming the insulating part. The cleaning step prior to the formation of the insulating portion can be completed in a short time, and the transition to the step after the formation of the insulating portion can be performed quickly.

  In the implementation of the fifth characteristic configuration, various liquids can be used as the insulating liquid as long as it has practically sufficient electrical insulation, but the insulating liquid does not adversely affect the paint ( For example, butyl acetate is desirable.

  Further, in the implementation of the fifth characteristic configuration, it is necessary for the insulating portion to pass the insulating liquid through the insulating target portion by supplying the insulating liquid from the insulating liquid supply path and discharging the insulating liquid from the insulating drain path. Continuously or intermittently throughout the entire period, or continuously for a certain period after the formation of the insulating part, and after that, the insulating liquid is sealed in the part to be insulated. Various embodiments can be employed, such as a form in which the insulating part is maintained, or the flow is performed only at the stage of forming the insulating part, and then the insulating liquid is sealed in the part to be insulated and the insulating part is maintained.

  As in the conventional apparatus, the cleaning means may be configured to flow a cleaning gas (for example, air) following the flow of the cleaning liquid in the cleaning process, or may omit the cleaning gas flow in the cleaning process. Only the cleaning liquid may be allowed to flow.

  A typical example of a paint pipe line for providing a portion to be insulated is a paint supply path to a paint gun in a coating apparatus, but is not limited to this. For example, a paint transport pipe to a tank or the like It may be.

[6] The sixth feature configuration of the present invention specifies an embodiment suitable for the implementation of the fifth feature configuration.
A liquid tank for storing the insulating liquid is provided, and the insulating liquid is supplied from the liquid tank to the insulating target part through the insulating liquid supply path, and the insulating drainage path is supplied from the insulating target part with the supply of the insulating liquid. The insulating liquid discharged into the liquid tank is returned to the liquid tank.

  That is, according to the sixth feature configuration, since the insulating liquid is circulated and used, the consumption of the insulating liquid can be reduced, the operating cost of the apparatus can be reduced, and the disposal of the insulating liquid can be performed. Processing is unnecessary and can be made light.

  In the implementation of the sixth characteristic configuration, the removal residue (residue removed from the portion to be insulated) brought into the liquid tank together with the return insulating liquid from the insulating drainage path is separated from the insulating liquid and supplied for insulation. It is desirable to additionally provide separation means for purifying the insulating liquid sent to the part to be insulated through the liquid path.

  It is also desirable to additionally provide a measuring means for measuring the electrical conductivity of the insulating liquid sent to the part to be insulated through the insulating liquid supply path.

[7] The seventh characteristic configuration of the present invention relates to a coating apparatus using the paint pipe line insulating device of the fifth or sixth characteristic configuration,
It is equipped with a paint gun that discharges paint that is pressurized and supplied from a feed tank by pressure feeding means in a charged state by applying voltage.
The paint gun is connected to the paint discharge passages of each of the plurality of feed tanks, and a tank switching valve for selectively switching a feed tank for supplying paint to the paint gun among the feed tanks is provided.
Filling that selectively connects a supply tank to be filled with paint from the paint filling path among a plurality of the supply tanks while connecting a branch filling path branched from the paint filling path to each of the supply tanks A switching valve, and a paint switching valve for switching the paint type of the paint to be filled in the supply tank through the paint filling path,
In this configuration, the insulating liquid supply passage and the insulating drainage passage interposed with the on-off valve are connected, and the insulating target portion provided with the gate valve is used as the paint discharge passage as the paint conduit. And each of the branch filling paths,
The cleaning means and the insulating part forming means for the parts to be insulated are provided.

  That is, in the coating device having the seventh feature configuration (see FIG. 1), the paint discharge path from any one of the supply tanks 3A and 3B selected by the tank switching valves 11a and 11b, as in the coating device having the fourth feature configuration. While the paint T supplied through 4a and 4b is discharged from the paint gun 1, the paint Ta to Tn selected by the paint switching valves 30a to 30n is branched and filled into the paint filling path 13 and the feed tanks 3A and 3B. An operation mode in which the other supply tanks 3A and 3B selected by the filling switching valves 27a and 27b are filled through the paths 13a and 13b is adopted.

  Further, the insulation target portions S are provided in the paint discharge paths 4a and 4b from the respective feed tanks 3A and 3B and the branch filling paths 13a and 13b for the respective feed tanks 3A and 3B. Equipped with cleaning means for S and insulation forming means, switching according to switching of supply tanks 3A, 3B for supplying paint to coating gun 1 and switching of supply tanks 3A, 3B to be filled with paint The insulation target portion S provided in the branch filling passages 13a, 13b to the feed tanks 3A, 3B for supplying paint to the coating gun 1 later, and the paint discharge passage 4a of the feed tanks 3A, 3B to be filled with paint after switching. , 4b, by selectively forming an insulating portion by an insulating fluid in the portion to be insulated S, the applied voltage at the coating gun 1 is made through the conductive paint T in the paint path. To the upstream side of the charge path to prevent the far-leakage manner.

  And according to this 7th characteristic structure, about each insulation object part S provided in each part, the above-mentioned 5th characteristic structure (interposition of the gate valve with respect to both ends, and the liquid supply path for insulation which interposed the on-off valve) And the connection of the drainage path for insulation), the cleaning air and the cleaning air are simply encapsulated in the part to be insulated following the flow of the cleaning liquid and the cleaning air by using the above-described conventional paint pipe line insulating device. Compared to forming an insulating part, it is possible to more reliably and efficiently remove the residue in the insulating target part during the process of forming the insulating part, and to achieve better insulation with less risk of deterioration of the insulation due to the residue. Therefore, it is possible to form the coating device with higher safety in terms of electrical leakage.

  In addition, the residue can be removed reliably and efficiently during the formation process of the insulating part, so that the cleaning process prior to the formation of the insulating part can be completed in a short time. The work efficiency of the painting work performed while switching the tank can be further increased.

  In this type of coating equipment, the paint filling is performed by feeding the cleaning liquid from the paint switching valve side when the supply tank for supplying paint to the coating gun is switched and when the supply tank to be filled with paint is switched. Since the cleaning at the time of switching for generally cleaning the path, the branch filling path, the feed tank, and the paint discharge path is generally performed, in the implementation of the seventh characteristic configuration, as in the above-mentioned fourth characteristic configuration, It is desirable to use the configuration as a cleaning means for each portion to be insulated.

[8] The eighth feature configuration of the present invention specifies an embodiment suitable for the implementation of the seventh feature configuration.
The insulation of the parts to be insulated in each of the paint discharge passage and the branch filling passage in cooperation with the operation of the tank switching valve, the pressure feeding means, the filling switching valve, and the paint switching valve. Insulation switching means for automatically switching the part to be insulated to be formed is provided,
The insulation switching means allows the insulation liquid to flow through the insulation liquid supply path and the insulation drainage path during the discharge of the paint from the coating gun to the insulation target portion in which the insulation portion is formed. The point is that it is configured to be in a state.

  That is, according to the eighth characteristic configuration, at the start of paint release from the paint gun (that is, at the start of voltage application), regardless of the formation of the insulating portion by the insulating liquid flow up to the start time, A little cleaning liquid in the previous cleaning process remains in the insulating part as the insulating liquid filling part, and after the discharge of the paint from the coating gun starts, the vapor of the cleaning liquid is evaporated in the insulating part. Even if the situation spreads to the surface, the formation of the flow-through state during the discharge of the paint allows the cleaning liquid vapor to be removed from the insulating part with the flow of the insulating liquid. It is possible to provide an insulating portion that can more reliably prevent the voltage from leaking to the upstream side of the paint path, and to obtain higher safety in terms of electrical leakage.

  In the implementation of the eighth characteristic configuration, the above-mentioned flow state is formed in the portion to be insulated continuously or intermittently throughout the entire period of paint discharge from the paint gun, or the paint release from the paint gun is performed. Various embodiments can be employed, such as a mode in which the flow state is formed in the portion to be insulated only for a predetermined period in the initial stage, and thereafter the insulating liquid is sealed in the portion to be insulated to maintain the insulating portion.

[First Embodiment]
FIG. 1 shows an apparatus configuration of a coating apparatus used for electrostatic coating. Reference numeral 1 denotes a bell-type coating gun which discharges paint in a mist form by a centrifugal action by rotation of a bell cup 1a. A high voltage generator 2 for charging the paint to be discharged from the gun by applying a voltage in the gun is electrically connected.

  The paint gun 1 is connected to a paint discharge path 4a from a first feed tank 3A having a cylinder structure and a paint discharge path 4b from a second feed tank 3B having a cylinder structure. In the side cleaning, dump paths 5a and 5b for discharging a part of the cleaning liquid L and a part of the cleaning air As and cleaning paths 6a and 6b for the inside of the cup and for the outside of the cup are connected.

  In the coating gun 1, the paint discharge paths 4a and 4b from the feed tanks 3A and 3B are connected to the main paint discharge path 4 whose tip is a paint supply port for the bell cup 1a via gate valves 7a and 7b. The dump passages 5a and 5b are connected to downstream portions of the paint discharge passages 4a and 4b in the paint flow direction via the on-off valves 8a and 8b.

  The paint discharge paths 4a and 4b are extended from the front surface of the front ends of the feed tanks 3A and 3B. The upstream side of the paint discharge paths 4a and 4b in the paint flow direction is a gun-side cleaning air supply path 9a. , 9b are connected via the on-off valves 10a, 10b, and the paint is supplied to the paint gun 1 in the paint discharge passages 4a, 4b on the upstream side of the connecting portions of the gun-side cleaning air supply passages 9a, 9b. Tank switching valves 11a and 11b for selectively switching between the supply tanks 3A and 3B are provided.

  Branch filling passages 13a and 13b branched from the paint filling passage 13 are connected to the side surfaces of the front end portions of the feed tanks 3A and 3B, and servos are connected to the feed tanks 3A and 3B having a cylinder structure via rods 14a and 14b. Pistons 16a and 16b connected to the motors 15a and 15b are internally provided, and the paint filling passage 13 is provided by reversing the pistons 16a and 16b by reversing the servomotors 15a and 15b for each of the feed tanks 3A and 3B. In addition, the supply tanks 3A and 3B are filled with a required amount of the paint T through the branch filling paths 13a and 13b under high-precision metering control.

  Further, the pistons 16a and 16b are moved forward by the forward rotation of the servo motors 15a and 15b, so that the paint T in the feed tanks 3A and 3B is coated through the paint discharge passages 4a and 4b under high-precision supply speed control. The gun 1 is pressurized and supplied, and the supplied paint T is discharged from the paint gun 1 in a charged state by voltage application.

  That is, the pistons 16a and 16b, the rods 14a and 14b, and the servo motors 15a and 15b constitute a pressure feeding means P that supplies the paint T from the feeding tanks 3A and 3B to the coating gun 1 under pressure.

  Drain passages 17a and 17b are connected to the downstream side portions of the branch filling passages 13a and 13b with respect to the feed tanks 3A and 3B in the paint flow direction via open / close valves 18a and 18b, and connection portions of the drain passages 17a and 17b are connected. In addition, gate valves 19a and 19b are interposed in the branch filling passages 13a and 13b on the downstream side.

  Further, between the on-off valves 23a, 17b on the downstream side of the on-off valves 18a, 18b and the on-off portions of the paint discharge paths 4a, 4b on the upstream side of the tank switching valves 11a, 11b, The escape paths 24a and 24b intervening 23b are provided.

  In addition, in the upstream portion of the branch filling passages 13a and 13b in the paint flow direction, filling switching valves 27a and 27b for selectively switching the supply tanks 3A and 3B to be filled with the paint from the paint filling passage 13 are provided. Is intervening.

  The upstream end of the paint filling path 13 is connected to a manifold 28a of the paint switching valve unit 28. The paint switching valve unit 28 has paints of different paint types supplied from a plurality of paint supply paths 29a to 29n. Among the Ta to Tn (in this embodiment, mainly water-based paints using water as a solvent and paints of different colors), any of the paints Ta to Tn is fed through the manifold 28a and the paint filling path 13 to supply tanks 3A and 3B. A plurality of paint switching valves 30a to 30n for selectively switching whether or not to fill is provided.

  A cleaning path 31 is connected to the manifold 28a of the paint switching valve unit 28. A cleaning liquid L supply path 32 is connected to the cleaning path 31 via a cleaning liquid valve 32a, and a cleaning air valve 33a. The supply path 33 for the cleaning air As is connected via

  The cleaning paths 6a and 6b for the inside of the cup and the outside of the cup are connected to the supply paths 34 and 35 for the cleaning liquid L via the cleaning liquid valves 34a and 35a, respectively, and the cleaning air valves 36a and 37a are connected to the cleaning paths 6a and 6b, respectively. The supply passages 36 and 37 for the cleaning air As are connected to each other.

  In this coating apparatus, the filling-side insulation is provided between the upstream-side filling switching valves 27a, 27b and the downstream-side gate valves 19a, 19b in the branch filling paths 13a, 13b to the respective feed tanks 3A, 3B. In addition to interposing the unit X, in the paint discharge passages 4a and 4b from the respective feed tanks 3A and 3B, the gun side is connected between the connection points of the gun-side cleaning air supply passages 9a and 9b and the gate valves 7a and 7b. An insulation unit X is interposed.

  That is, when the paint T is supplied from the first supply tank 3A to the coating gun 1 and the second supply tank 3B is the target of the paint filling from the branch filling path 13b, the first supply tank 3A is used. An electrically insulating portion is formed in the filling side insulating unit X provided in the branch filling path 13a and the gun side insulating unit X provided in the paint discharge path 4b from the second supply tank 3B. The applied voltage at the coating gun 1 is prevented from leaking through the paint path to the upstream side of the paint path.

  Conversely, when the paint T is supplied from the second feed tank 3B to the coating gun 1 and the first feed tank 3A is to be filled with the paint from the branch filling path 13a, the second feed An electrically insulating portion is formed in the filling side insulating unit X provided in the branch filling path 13b for the tank 3B and the gun side insulating unit X provided in the paint discharge path 4a from the first supply tank 3A, This also prevents the applied voltage at the coating gun 1 from leaking through the paint path to the upstream side of the paint path.

  It should be noted that there is a possibility that a current generated by voltage application in the coating gun 1 may be led, such as pipe materials forming each path, valves, feed tanks 3A and 3B, pistons 16a and 16b, rods 14a and 14b. Electrical insulation treatment such as using a forming material having electrical insulation is performed.

  As shown in FIG. 2, these insulating units X have a straight pipe 40 that forms an insulation target portion S in the branch filling paths 13a and 13b and the paint discharge paths 4a and 4b, which are paint pipes, as unit bases. The straight pipe 40 is internally provided with a cleaning pig 41 that is movable in the longitudinal direction of the pipe while being in sliding contact with the inner peripheral surface of the pipe.

  Connected to both ends of the straight pipe 40 are pressurizing supply paths 42a and 42b for operating air Ac that pressurizes and supplies the operating air Ac as a pig operating fluid to the inside of the straight pipe 40. Open / close valves 43a and 43b are interposed in the pressure supply passages 42a and 42b on the other end side.

  Then, the upstream portion of the branch filling passages 13a, 13b and the paint discharge passages 4a, 4b (that is, the paint inlet passage) is arranged in the longitudinal direction of the pipe more than the connection portion of the pressurizing supply passage 42a on one end side of the straight pipe 40. It is connected to the straight pipe 40 at a position near the center and in a direction orthogonal to the core of the straight pipe 40, and downstream portions of the branch filling paths 13a, 13b and the paint discharge paths 4a, 4b (that is, the paint outlet) The pipe) is connected to the other end of the straight pipe 40 together with the pressure supply path 42b on the other end side, and gate valves 44a and 44b are interposed at the inlet side and outlet side connection portions.

  In other words, on one end side of the straight pipe 40, the portion between the connection place of the upstream side portion (paint inlet pipe line) of the branch filling paths 13a, 13b and the paint discharge paths 4a, 4b and the connection place of the pressure supply path 42a is The pig storage unit 45 stores the pig 41 in a state of being retracted from the paint path, and opens the on-off valve 43a to supply the operating air Ac to the pig storage unit 45 from the pressurized supply path 42a on one end side. As a result, the pig 41 is moved from the pig storage part 45 to the other end of the straight pipe 40 in a sliding state with respect to the inner peripheral surface of the pipe by pressing with the operating air Ac, and the on-off valve 43b is opened to open the other end side. By pressing the operation air Ac from the pressure supply path 42b to the other end of the straight pipe 40, the pig 41 is brought into sliding contact with the inner peripheral surface of the pipe 40 by the pressure of the operation air Ac. Move from other end to pig storage 45 The pressure supply passages 42 a and 42 b for the operation air Ac and the on-off valves 43 a and 43 b interposed therebetween move the pig 41 over the pig storage 45 and the other end of the straight pipe 40. It constitutes a pig operating means.

  That is, in these insulating units X, when the supply tanks 3A and 3B for supplying the paint to the coating gun 1 are switched, and the supply tanks 3A and 3B to be filled with the paint from the branch filling paths 13a and 13b are switched. In the cleaning process, the cleaning liquid L and the cleaning air As are sequentially passed through the paint discharge paths 4a and 4b and the branch filling paths 13a and 13b, and the paint discharge paths 4a and 4b and the branch filling paths 13a and 13b. Then, the gate valves 44a and 44b are closed and the straight pipe 40 is filled with air so that the air is contained as an insulating fluid in the straight pipe 40. Before the containment, the pig 40 in the pig storage unit 45 is reciprocated between the pig storage unit 45 and the other end of the straight pipe 40 by the operation of supplying the operation air Ac. Then, the residue in the straight pipe 40 is surely excluded from the inside of the straight pipe 40 (insulation target portion S), and thereby, a good insulating portion (in this example, there is no risk of a decrease in electrical insulation due to the residue) , A filled portion of air as an insulating fluid) is formed inside the straight pipe 40.

  As shown in FIG. 3, this painting apparatus is equipped with a painting gun 1 at the tip of a work arm 38a of a painting robot 38, feed tanks 3A and 3B, servo motors 15a and 15b, a paint switching valve unit 28, and The painting robot 38 is equipped with each valve stored in the work arm 38a.

  In addition, this painting apparatus is equipped with a controller 39, and the controller 39 automatically operates the valves and servo motors 15a and 15b according to the setting program in cooperation with the operation control for the painting robot 38. While the paint T supplied from any one of the feed tanks 3A and 3B is discharged from the paint gun 1 and the paint is applied, the paint T selected by the paint switching valves 30a to 30n is supplied to the other feed tanks. In the form of filling 3A and 3B, electrostatic coating by discharging paint from the coating gun 1 is sequentially and automatically performed on a plurality of objects W to be coated.

  Further, in this coating apparatus, the controller 39 operates in conjunction with the operations of the tank switching valves 11a and 11b, the servo motors 15a and 15b, the filling switching valves 27a and 27b, and the paint switching valves 30a to 30n. Of the insulating units X in each of the paint discharge paths 4a and 4b and in each of the branch filling paths 13a and 13b, the one in which the insulating portion is formed is automatically switched as shown in (a) to (f) below. .

  4-17 shows each process in operation | movement of this coating device, and following (a)-(f) demonstrates each process in order of progress of a process along this figure. 4 to 17, the thick solid line indicates the flow of the paint T, the thick dashed line indicates the flow of the cleaning liquid L, and the thick broken line indicates the flow of the cleaning air As. A filled valve indicates a valve in an open state, and a white valve indicates a valve in a closed state.

  Of the four insulating units X, the solid ones indicate the insulating units in the state where the insulating portions are formed, and the white ones indicate the insulating units where the insulating portions are not formed.

  (A) FIG. 4 shows a blowing step performed prior to painting by supplying paint from the first supply tank 3A. In this step, the coating gun 1 is passed from the first supply tank 3A through the paint discharge path 4a. The initial coating material T to be supplied is discharged from the coating gun 1 without being charged by voltage application.

  In this step, the insulation unit X in the branch filling path 13a of the first feed tank 3A and the insulation unit X in the paint discharge path 4b of the second feed tank 3B are connected to the straight pipe 40 after the pig reciprocating operation. The insulation portion is formed in a state in which air is contained inside, thereby reliably preventing the applied voltage from the coating gun 1 from leaking to the upstream side of the paint path in the next painting process.

  (B) FIG. 5 shows a process part in which the filling of the paint into the second feed tank 3B is started in parallel with the painting process of painting the article W by the paint supply from the first feed tank 3A. In this process portion, as the execution of the painting process, the paint T supplied from the first feed tank 3A to the paint gun 1 through the paint discharge path 4a is discharged from the paint gun 1 in a state of being charged by voltage application.

  Further, in the state where the on-off valve 23b is opened to allow the second supply tank 3B to communicate with the drain passage 17b through the escape passage 24b, the paint T of the paint type necessary for the next painting step is applied to the paint switching valve unit 28. Then, filling of the second feed tank 3B is started through the paint filling path 13 and the branch filling path 13b, and the initial one of the filled paint T is discharged to the drain path 17b through the escape path 24b.

  Then, in this process part, for the paint supply from the first supply tank 3A and the paint filling to the second supply tank 3B, in the branch filling path 13a of the first supply tank 3A, following the previous process. The insulating unit X and the insulating unit X in the paint discharge path 4b of the second supply tank 3B are maintained in the insulating portion forming state.

  (C) FIG. 6 shows a process part in which the paint supply to the second supply tank 3B started earlier is performed in parallel with the coating process by supplying the paint from the first supply tank 3A. In the process part, as in the case of (b), the coating process is carried out from the coating gun 1 in a state where the paint T supplied from the first feed tank 3A to the coating gun 1 through the paint discharge path 4a is charged by voltage application. Release.

  Further, in the state where the on-off valve 23b is closed to prevent the filling paint T from flowing out to the escape path 24b, the paint T of the necessary paint type in the next painting process is supplied from the paint switching valve unit 28 to the paint filling path 13 and The second feed tank 3B is filled through the branch filling path 13b.

  In this process part, as in the previous process part, the branch supply path 13a of the first supply tank 3A is used for supplying paint from the first supply tank 3A and filling paint into the second supply tank 3B. And the insulating unit X in the paint discharge path 4b of the second feed tank 3B are continuously maintained in the insulating portion forming state.

  (D) In FIG. 7, the first half of the filling side cleaning following the completion of the filling of the paint into the second feed tank 3B is performed in parallel with the painting process by the paint supply from the first feed tank 3A. The process part is shown. In this process part, the paint T supplied from the first supply tank 3A to the paint gun 1 through the paint discharge path 4a is applied by applying a voltage as in the case of (b) and (c). Release from the paint gun 1 in a charged state.

  In addition, the gate valve 19b is closed, the on-off valve 18b is opened, and the branch filling path 13b is connected to the drain path 17b, the cleaning liquid valve 32a is opened, and the cleaning liquid L is supplied to the paint switching valve unit. 28 is passed through the paint filling passage 13 and the branch filling passage 13b and discharged to the drain passage 17b. As a result, the manifold of the paint switching valve unit 28 is prepared for the passage of the next paint T as the first half of the filling side cleaning. The cleaning liquid L is used to clean the paint filling path 13 and the branch filling path 13b.

  In this process portion, the insulating unit X in the branch filling path 13a of the first supply tank 3A is supplied to the paint supply from the first paint tank 3A and the cleaning liquid supply to the branch filling path 13b of the second supply tank 3B. Then, the insulating unit X in the paint discharge path 4b of the second supply tank 3B is maintained in the insulating portion forming state following the previous process portion.

  (E) FIG. 8 shows the second half of the filling side cleaning following the completion of the paint filling to the second feed tank 3B in parallel with the painting process by the paint feed from the first feed tank 3A. The process part is shown. In this process part, the paint T supplied from the first feed tank 3A to the paint gun 1 through the paint discharge path 4a is applied by applying a voltage as in the case of the paint process as in (b) to (d) above. Release from the paint gun 1 in a charged state.

  Further, the cleaning liquid valve 32a is closed and the cleaning air valve 33a is opened so that the cleaning air As instead of the cleaning liquid L is allowed to flow from the paint switching valve unit 28 to the paint filling path 13 and the branch filling path 13b. As a result, the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13b of the paint switching valve unit 28 previously cleaned with the cleaning liquid L is cleaned as the latter half of the filling side cleaning. Exclude them with working air As and dry those parts.

  In this process portion, the paint supply from the first supply tank 3A and the flow of the cleaning air As in the branch filling path 13b of the second supply tank 3B (that is, the state including the removed residual cleaning liquid L are included). For the flow of the cleaning air As), the insulating unit X in the branch filling path 13a of the first feed tank 3A and the insulating unit X in the paint discharge path 4b of the second feed tank 3B are processed in the previous process portion. Subsequently, the insulating part is formed.

  In this process portion, the cleaning air As is used to remove the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13b, and after these parts are dried, the cleaning air valve 33a is closed. In the state where the supply of the cleaning air As is stopped, the pig 41 of the insulating unit X in the branch filling path 13b is pig-stored by the operation of supplying the operating air Ac by operating the on-off valves 43a and 43b in the insulating unit X. The pipe 45 is moved back and forth between the pipe 45 and the other end of the straight pipe 40 so that the inside of the straight pipe 40 is cleaned by the pig 41. After that, the pig 41 is returned to the pig storage section 45 and the insulation is By closing the gate valves 44a and 44b in the unit X and containing air (mainly operating air Ac supplied to the other end of the straight pipe 40) inside the straight pipe 40, the branch filling path 1 The insulating unit X in b to the insulating portion forming state.

  (F) FIG. 9 shows a process part in which the first half of the gun-side cleaning is carried out following the end of the painting process by supplying the paint from the first supply tank 3A. With the end of the paint supply from the first feed tank 3A, the gate valves 44a and 44b of the insulation unit X in the branch filling path 13a of the first feed tank 3A are opened, and the straight pipe in the insulation unit X is opened. Release air containment inside (that is, release the insulation).

  Further, in the system of the second feed tank 3B in which the paint filling and the subsequent filling side cleaning are completed, the gate valves 44a and 44b of the insulating unit X in the paint discharge path 4b are opened, and the The containment of air into the pipe is released (the formation of the insulating portion is released), while the insulating unit X in the branch filling path 13b that has been in the insulating portion forming state in the previous process portion is maintained in the insulating portion forming state.

  Then, the filling switching valve 27b of the system of the second feeding tank 3B is closed, and the filling switching valve 27a and the gate valve 19a of the system of the first feeding tank 3A are opened, so that the paint filling path 13 is opened. One communication tank 3A is communicated, and the on-off valve 8a is opened under the open state of the gate valve 7a, so that the paint discharge passage 4a, the main paint discharge passage 4 and the dump passage 5a communicate with each other. In this state, the cleaning liquid valve 32a is opened to allow the cleaning liquid L to flow from the paint switching valve unit 28 to the paint filling path 13, the branch filling path 13a, and the paint discharge path 4a. Is discharged from the coating gun 1 while the voltage application is stopped, and the other part is discharged to the dump path 5a.

  That is, by supplying the cleaning liquid, the first supply tank 3A, the paint discharge path 4a, and the main paint discharge path 4 are cleaned by the cleaning liquid L in preparation for the next flow of the paint T as the first half of the gun side cleaning.

  Further, in this process part, the cleaning liquid valves 34a and 35a are opened, and the cleaning liquid L is supplied to the inside and outside of the bell cup 1a in the coating gun 1 through the cleaning paths 6a and 6b for the inside and outside of the cup. Thus, the inner and outer sides of the bell cup 1a are cleaned with the cleaning liquid L in preparation for the next discharge of the paint T.

  (G) FIG. 10 shows a process part in which the second half of the gun-side cleaning following the end of the painting process by supplying the paint from the first supply tank 3A is performed. In this process part, the cleaning liquid valve 32a and the tank are shown. While the switching valve 11a is closed, the on-off valve 10a is opened, and the cleaning air As is replaced with the cleaning liquid L from the gun-side cleaning air supply path 9a to the paint discharge path 4a, and the cleaning is performed. A part of the working air As is discharged from the coating gun 1 under the state where the voltage application is stopped, and the other part is discharged to the dump path 5a, thereby cleaning with the cleaning liquid L first as the rear half of the gun side cleaning. The residual cleaning liquid L in the paint discharge path 4a and the main paint discharge path 4 is removed by the cleaning air As from the gun-side cleaning air supply path 9a, and those portions are dried.

  Further, in this painting process, the cleaning liquid valves 34a and 35a are closed and the cleaning air valves 36a and 37a are opened so that the cleaning air As is used for cleaning the cup interior and the cup exterior instead of the cleaning liquid L. Through the passages 6a and 6b, the paint gun 1 is fed to the inside and the outside of the bell cup 1a, thereby removing the residual cleaning liquid L inside and outside the bell cup 1a previously cleaned with the cleaning liquid L by the cleaning air As. And dry those parts.

  In this process portion, the cleaning air As from the gun-side cleaning air supply passage 9a is used to remove the residual cleaning liquid L in the paint discharge passage 4a and the main paint discharge passage 4, and after these portions are dried, In a state where the on-off valve 10a is closed and the supply of the cleaning air As from the gun-side cleaning air supply passage 9a is stopped, the pig 41 of the insulating unit X in the paint discharge passage 4a is connected to the on-off valve in the insulating unit X. By reciprocating between the pig storage part 45 and the other end of the straight pipe 40 by the operation of supplying the operation air Ac by the operation of 43a, 43b, the inside of the straight pipe 40 is cleaned by the pig 41, and thereafter In the state where the pig 41 is returned to the pig storage unit 45, the gate valves 44a and 44b in the insulation unit X are closed and air is supplied into the straight pipe 40 (mainly supplied to the other end of the straight pipe 40). Seals the operating air Ac) By Mel, the insulating unit X in the paint discharge passage 4a in the insulating portion forming state.

  Further, following the previous process portion, the insulating unit X in the branch filling path 13b of the second supply tank 3B is maintained in the insulating portion formation state.

  (H) FIG. 11 shows a blowing step performed prior to painting by supplying paint from the second supply tank 3B. In this step, the coating gun 1 is passed from the second supply tank 3B through the paint discharge path 4b. The initial coating material T to be supplied is discharged from the coating gun 1 without being charged by voltage application.

  Then, the insulation unit X in the branch filling path 13b of the second feed tank 3B and the insulation unit X in the paint discharge path 4a of the first feed tank 3A are passed through the straight pipe 40 following the previous step. By maintaining the encapsulated insulating portion formation state, it is possible to reliably prevent the applied voltage at the painting gun 1 from leaking to the upstream side of the paint path in the next painting step, as in the case of (a) above.

  (L) FIG. 12 shows a process portion in which the filling of the first feeding tank 3A is started in parallel with the painting process of painting the article W by the coating material supply from the second feeding tank 3B. In this process part, as the execution of the painting process, the paint T supplied from the second supply tank 3B to the paint gun 1 through the paint discharge path 4b is discharged from the paint gun 1 while being charged by voltage application.

  Further, in the state where the on-off valve 23a is opened and the first supply tank 3A is in communication with the drain path 17a through the escape path 24a, the paint type T necessary for the next painting process is applied to the paint switching valve unit 28. Then, filling of the first feed tank 3A through the paint filling path 13 and the branch filling path 13a is started, and the initial one of the filled paint T is discharged to the drain path 17a through the escape path 24a.

  Then, in this process part, for the paint supply from the second supply tank 3B and the paint filling to the first supply tank 3A, in the branch filling path 13b of the second supply tank 3B, following the previous process. The insulating unit X and the insulating unit X in the paint discharge path 4b of the second supply tank 3B are maintained in the insulating portion forming state.

  (N) FIG. 13 shows a process part in which the filling of the first supply tank 3A, which has been started earlier, is proceeding in parallel with the coating process by supplying the paint from the second supply tank 3B. In the process part, as in the case of (i) above, the coating process is carried out, and the paint T supplied from the second feed tank 3B to the paint gun 1 through the paint discharge path 4b is discharged from the paint gun 1 while being charged by applying a voltage. Let

  Further, in a state where the on-off valve 23a is closed to prevent the filled paint T from flowing out to the escape path 24a, the paint T of the necessary paint type in the next painting process is supplied from the paint switching valve unit 28 to the paint filling path 13 and The first feed tank 3A is filled through the branch filling path 13a.

  In this process part, as in the previous process part, the branch supply path 13b of the second supply tank 3B is used for supplying paint from the second supply tank 3B and filling paint into the first supply tank 3A. And the insulating unit X in the paint discharge path 4a of the first feed tank 3A are continuously maintained in the insulating portion forming state.

  (L) FIG. 14 shows the first half of the filling-side cleaning following the completion of the filling of the paint into the first feed tank 3A in parallel with the painting process by the paint feed from the second feed tank 3B. The process part is shown, and in this process part, the paint T supplied from the second supply tank 3B to the paint gun 1 through the paint discharge path 4b is applied by applying a voltage as in the case of the coating process as in (ri) and (nu). Release from the paint gun 1 in a charged state.

  In addition, the gate valve 19a is closed and the on-off valve 18a is opened so that the branch filling passage 13a is in communication with the drain passage 17a, and the cleaning liquid valve 32a is opened to supply the cleaning liquid L to the paint switching valve unit. 28 is passed through the paint filling passage 13 and the branch filling passage 13a and discharged to the drain passage 17a. As a result, the manifold of the paint switching valve unit 28 is prepared for the passage of the next paint T as the first half of the filling side cleaning. The cleaning liquid L is used to clean the paint filling path 13 and the branch filling path 13a.

  In this process portion, the insulating unit X in the branch filling path 13b of the second supply tank 3B is supplied to the paint supply from the second paint tank 3B and the cleaning liquid supply to the branch filling path 13a of the first supply tank 3A. And the insulation unit X in the coating material discharge path 4a of the 1st feed tank 3A is maintained in the insulation part formation state following the previous process part.

  (W) FIG. 15 shows the second half of the filling side cleaning following the completion of the paint filling to the first feed tank 3A in parallel with the painting process by the paint feed from the second feed tank 3B. The process part is shown, and in this process part, the paint T supplied from the second supply tank 3B to the paint gun 1 through the paint discharge path 4b is applied by applying a voltage as in the case of the painting process as in (Li) to (Le). Release from the paint gun 1 in a charged state.

  Further, the cleaning liquid valve 32a is closed and the cleaning air valve 33a is opened so that the cleaning air As instead of the cleaning liquid L is allowed to flow from the paint switching valve unit 28 to the paint filling path 13 and the branch filling path 13a. As a result, the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13a of the paint switching valve unit 28 previously cleaned with the cleaning liquid L is cleaned as the latter half of the filling side cleaning. Exclude them with working air As and dry those parts.

  In this process portion, the paint supply from the second supply tank 3B and the flow of the cleaning air As in the branch filling passage 13a of the first supply tank 3A (that is, the state including the removed residual cleaning liquid L are included). For the flow of cleaning air As), the insulating unit X in the branch filling path 13b of the second supply tank 3B and the insulating unit X in the paint discharge path 4a from the first supply tank 3A are processed in the previous step. The insulation part is formed in a state following the part.

  In this process part, the cleaning air As is used to remove the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13a, and after these parts are dried, the cleaning air valve 33a is closed. In the state where the supply of the cleaning air As is stopped, the pig 41 of the insulating unit X in the branch filling passage 13a is stored in the pig by the operation of supplying the operating air Ac by operating the on-off valves 43a and 43b in the insulating unit X. The pipe 45 is moved back and forth between the pipe 45 and the other end of the straight pipe 40 so that the inside of the straight pipe 40 is cleaned by the pig 41. After that, the pig 41 is returned to the pig storage section 45 and the insulation is By closing the gate valves 44a and 44b in the unit X and containing air (mainly operating air Ac supplied to the other end of the straight pipe 40) inside the straight pipe 40, the branch filling path 1 The insulating unit X in a to the insulating portion forming state.

  (W) FIG. 16 shows a process part in which the first half of the gun-side cleaning is performed following the end of the painting process by supplying the paint from the second supply tank 3B. Along with the end of the paint supply from the second feed tank 3B, the gate valves 44a and 44b of the insulation unit X in the branch filling path 13b of the second feed tank 3B are opened, and the straight pipe in the insulation unit X is opened. Release air containment inside (that is, release the insulation).

  Further, in the system of the first feed tank 3A that has completed the paint filling and the subsequent filling side cleaning, the gate valves 44a and 44b of the insulation unit X in the paint discharge passage 4a are opened, and The containment of air into the tube is released (the formation of the insulating portion is released), while the insulating unit X in the branch filling path 13a that has been in the insulating portion forming state in the previous process portion is maintained in the insulating portion forming state.

  Then, the filling switching valve 27a of the system of the first feed tank 3A is closed, and the filling switching valve 27b and the gate valve 19b of the system of the second feeding tank 3B are opened, and the paint filling passage 13 is opened. 2 The communication between the paint delivery path 4b, the main paint delivery path 4 and the dump path 5b is made to communicate with the feed tank 3B and the on-off valve 8b is opened with the gate valve 7b open. In this state, by opening the cleaning liquid valve 32a, the cleaning liquid L is caused to flow from the paint switching valve unit 28 to the paint filling path 13, the branch filling path 13b, and the paint discharge path 4b. Is discharged from the coating gun 1 under the state where the voltage application is stopped, and the other part is discharged to the dump path 5b.

  That is, by supplying the cleaning liquid, the second supply tank 3B, the paint discharge path 4b, and the main paint discharge path 4 are cleaned with the cleaning liquid L in preparation for the next flow of the paint T as the first half of the gun side cleaning.

  Further, in this process part, the cleaning liquid valves 34a and 35a are opened, and the cleaning liquid L is supplied to the inside and outside of the bell cup 1a in the coating gun 1 through the cleaning paths 6a and 6b for the inside and outside of the cup. Thus, the inner and outer sides of the bell cup 1a are cleaned with the cleaning liquid L in preparation for the next discharge of the paint T.

  (F) FIG. 17 shows a process part in which the second half of the gun-side cleaning following the end of the painting process by supplying the paint from the second feed tank 3B is performed. In this process part, the cleaning liquid valve 32a and the tank are shown. While the switching valve 11b is closed, the on-off valve 10b is opened, and the cleaning air As is passed through the gun-side cleaning air supply path 9b to the paint discharge path 4b instead of the cleaning liquid L, and the cleaning is performed. A part of the working air As is discharged from the coating gun 1 under the state where the voltage application is stopped, and the other part is discharged to the dump path 5b, thereby cleaning with the cleaning liquid L first as the rear half of the gun side cleaning. The residual cleaning liquid L in the paint discharge path 4b and the main paint discharge path 4 is removed by the cleaning air As from the gun-side cleaning air supply path 9b, and those portions are dried.

  Further, in this painting process, the cleaning liquid valves 34a and 35a are closed and the cleaning air valves 36a and 37a are opened so that the cleaning air As is used for cleaning the cup interior and the cup exterior instead of the cleaning liquid L. Through the passages 6a and 6b, the paint gun 1 is fed to the inside and the outside of the bell cup 1a, thereby removing the residual cleaning liquid L inside and outside the bell cup 1a previously cleaned with the cleaning liquid L by the cleaning air As. And dry those parts.

  In this process portion, the cleaning air As from the gun-side cleaning air supply passage 9b is used to eliminate the residual cleaning liquid L in the paint discharge passage 4b and the main paint discharge passage 4, and after these portions are dried, With the on-off valve 10b closed and the supply of the cleaning air As from the gun-side cleaning air supply passage 9b stopped, the pig 41 of the insulating unit X in the paint discharge passage 4b is connected to the on-off valve in the insulating unit X. By reciprocating between the pig storage part 45 and the other end of the straight pipe 40 by the operation of supplying the operation air Ac by the operation of 43a, 43b, the inside of the straight pipe 40 is cleaned by the pig 41, and thereafter In the state where the pig 41 is returned to the pig storage unit 45, the gate valves 44a and 44b in the insulation unit X are closed and air is supplied into the straight pipe 40 (mainly supplied to the other end of the straight pipe 40). Seals the operating air Ac) By Mel, the insulating unit X in the paint discharge passage 4b in the insulating portion forming state.

  Further, following the previous process portion, the insulating unit X in the branch filling path 13a of the first supply tank 3A is maintained in the insulating portion forming state.

  That is, in this coating apparatus, by repeating the above (a) to (f), the plurality of objects to be coated W are sequentially coated with the required paint types of paints Ta to Tn, respectively.

  As described above, the coating apparatus according to the first embodiment includes the coating gun 1 that discharges the paint T, which is supplied under pressure from the feed tanks 3A and 3B by the pressure feeding means P, in a state where the paint T is charged by voltage application. 1 is connected to the paint discharge passages 4a and 4b of the plurality of feed tanks 3A and 3B, and the feed tanks 3A and 3B for supplying the paint to the paint gun 1 are selected from the feed tanks 3A and 3B. Tank switching valves 11a and 11b are provided for switching, and branch filling passages 13a and 13b branched from the paint filling passage 13 are connected to the feed tanks 3A and 3B, respectively, and the paint among the plurality of feed tanks 3A and 3B is connected. Filling switching valves 27a and 27b for selectively switching the feed tanks 3A and 3B to be filled with paint from the filling path 13 and the feed tanks 3A and 3B through the paint filling path 13 It adopts a basic configuration in which the paint selector valve 30a~30n for switching the paint type paint T to be filled.

  In this basic configuration, the straight pipe 40 in the insulation unit X as the insulation target portion S, in which the pig 41 is housed and the pig storage 45 and the pig operating means are provided, is used as the paint discharge paths 4a and 4b as the paint pipes. And the branch filling passages 13a and 13b.

  The cleaning liquid supply path 32 and the cleaning liquid valve 32a constitute cleaning means for cleaning the inside of the straight pipe 40 in the insulating unit X as the insulation target portion S by the flow of the cleaning liquid L instead of the paint T, and the insulating unit The pressure supply passages 42a and 42b of the operation air As in X and the on-off valves 43a and 43b interposed therebetween constitute a pig operation means, and the operation air As supplied to the straight pipe 40 is used as an insulating fluid. The insulating part forming means for forming the insulating part filled with the insulating fluid inside the straight pipe 40 in the insulating unit X as the part to be insulated S is configured.

[Second Embodiment]
FIG. 18 shows a coating apparatus in which the insulation unit X interposed in the paint discharge passages 4a and 4b and the branch filling passages 13a and 13b in the coating apparatus shown in the first embodiment is changed to another type of insulation unit X ′. In this other type of insulation unit X ′, as shown in FIG. 19, the straight pipe 40 ′ forming the insulation target portion S in the branch filling passages 13a, 13b and the paint discharge passages 4a, 4b is used as the unit base, and the branch filling is performed. One of the upstream portion (paint inlet passage) and the downstream portion (paint outlet passage) of the passages 13a and 13b and the paint discharge passages 4a and 4b is connected to one end of the straight pipe 40 'via the gate valve 46a. The other is connected to the other end of the straight pipe 40 'through the gate valve 46b.

  Further, a structure in which an insulating drainage path 47a is connected to one end of the straight pipe 40 'and an insulating liquid supply path 47b is connected to the other end of the straight pipe 40 (in other words, an insulating drainage path). 47a and the insulating liquid supply passage 47b are connected to the straight pipe 40 'between the gate valves 46a and 46b in a state in which the connecting points to the straight pipe 40' are separated in the pipe longitudinal direction. On-off valves 48a and 48b are interposed in the insulating drainage path 47a and the insulating liquid supply path 47b.

  In this coating apparatus, the insulating drainage passage 47a of each of the four insulating units X ′ interposed in the coating material discharge passages 4a and 4b and the branch filling passages 13a and 13b is connected to the liquid return portion in the liquid tank 49. In addition, the insulating liquid supply passage 47b of each of the four insulating units X ′ is connected in parallel to the main insulating liquid supply path 50 from the liquid tank 49, and the main insulating liquid supply path 50 is provided with a circulation pump 51.

  In other words, for each of the four insulation units X ′, by opening the on-off valves 48a and 48b with the gate valves 46a and 46b closed under the operation of the circulation pump 51, the insulation liquid supply path 47b and the insulation liquid passage 47b are opened. In the form of circulation through the drainage passage 47a, the insulating liquid R (liquid having electrical insulating properties) in the liquid tank 49 is caused to flow through the inside of the straight pipe 40 'in a full state. An electrically insulating portion is formed inside the tube 40 '.

  The specific operation modes of the four insulating units X ′ will be described in correspondence with the respective steps (a) to (f) shown in the first embodiment. Steps (a) to (e) (FIG. 4 to 8), the insulating unit X 'in the branch filling path 13a of the first feeding tank 3A and the insulating unit X' in the paint discharge path 4b of the second feeding tank 3B are connected to the gate valves 46a and 46b. Under the valve closing condition, the insulating part is formed so that the insulating liquid R flows through the straight pipe 40 '.

  In the step (e), the cleaning air As is used to remove the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13b, and after these parts are dried, the cleaning air valve 33a. Is closed and the supply of the cleaning air As is stopped, the gate valves 46a and 46b of the insulating unit X 'in the branch filling passage 13b are closed and the on-off valves 48a and 48b are opened, and the insulating unit X The insulating liquid R is allowed to flow in the full state of the straight pipe 40 ', thereby bringing the insulating unit X' in the branch filling path 13b into an insulating portion forming state.

  In step (f) (see FIG. 9), the insulation unit X ′ is opened and closed in the branch filling path 13a of the first feed tank 3A as the paint supply from the first feed tank 3A to the coating gun 1 is completed. The valves 48a and 48b are closed and the gate valves 46a and 46b are opened, and the flow of the insulating liquid R to the inside of the straight pipe in the insulating unit X ′ is finished (that is, the formation of the insulating portion is released). .

  In the step (f), in the system of the second feed tank 3B in which the paint filling and the subsequent filling side cleaning are completed, the on-off valves 48a and 48b of the insulating unit X ′ in the paint discharge path 4b are closed. At the same time, the gate valves 46a and 46b are opened to terminate the flow of the insulating liquid R to the inside of the straight pipe in the insulating unit X ′ (that is, release the formation of the insulating portion). The insulating unit X ′ in the branch filling passage 13b in the insulating portion forming state is maintained in the insulating portion forming state in which the insulating liquid R flows through the straight pipe 40 ′ under the shutoff of the gate valves 46a and 46b.

  In step (g) (see FIG. 10), the cleaning air As from the gun-side cleaning air supply passage 9a is used to remove the residual cleaning liquid L in the paint discharge passage 4a and the main paint discharge passage 4, and to remove these portions. In the state where the on-off valve 10a is closed and the supply of the cleaning air As from the gun-side cleaning air supply passage 9a is stopped, the gate valve 46a of the insulating unit X 'in the paint discharge passage 4a is stopped. 46b is closed and the on-off valves 48a and 48b are opened to allow the insulating liquid R to flow through the straight pipe 40 'of the insulating unit X' in a full state, whereby the insulating unit X in the paint discharge path 4a is passed. ′ Is in an insulating portion forming state.

  Further, in the step (g), the insulating unit X ′ in the branch filling path 13b of the second feed tank 3B is used, and the insulating liquid R is applied to the inside of the straight pipe 40 ′ under the shutoff of the partition valves 46a and 46b. Maintain the insulating part formation state to allow flow.

  In the process parts (H) to (W) (see FIGS. 11 to 15), the insulation unit X ′ in the branch filling path 13b of the second feed tank 3B and the paint discharge path 4a of the first feed tank 3A. The insulating unit X ′ is maintained in an insulating portion forming state in which the insulating liquid R is allowed to flow through the straight pipe 40 ′ with the gate valves 46 a and 46 b closed.

  Then, in the process part (W), the cleaning air As is used to remove the residual cleaning liquid L in the manifold 28a, the paint filling path 13, and the branch filling path 13a, and after these parts are dried, the cleaning air valve 33a. Is closed and the supply of the cleaning air As is stopped, the gate valves 46a and 46b of the insulating unit X 'in the branch filling passage 13a are closed and the on-off valves 48a and 48b are opened, and the insulating unit X The insulating liquid R is caused to flow in the full state of the straight pipe 40 ', thereby bringing the insulating unit X' in the branch filling path 13a into an insulating portion forming state.

  In step (a) (see FIG. 16), when the supply of paint from the second supply tank 3B to the coating gun 1 is completed, the insulating unit X ′ is opened and closed in the branch filling path 13b of the second supply tank 3B. The valves 48a and 48b are closed and the gate valves 46a and 46b are opened, and the flow of the insulating liquid R to the inside of the straight pipe in the insulating unit X ′ is finished (that is, the formation of the insulating portion is released). .

  Further, in the process (a), in the system of the first feed tank 3A in which the paint filling and the subsequent filling side cleaning are completed, the on-off valves 48a and 48b of the insulating unit X ′ in the paint discharge path 4a are closed. At the same time, the gate valves 46a and 46b are opened to terminate the flow of the insulating liquid R to the inside of the straight pipe in the insulating unit X ′ (that is, release the formation of the insulating portion). The insulating unit X ′ in the branch filling path 13a in the insulating portion forming state is maintained in the insulating portion forming state in which the insulating liquid R is allowed to flow through the straight pipe 40 ′ under the closing of the gate valves 46a and 46b.

  In step (f) of FIG. 17 (see FIG. 17), the cleaning air As from the gun-side cleaning air supply passage 9b is used to remove the residual cleaning liquid L in the paint discharge passage 4b and the main paint discharge passage 4, and to remove these portions. In the state where the on-off valve 10b is closed and the supply of the cleaning air As from the gun-side cleaning air supply passage 9b is stopped, the gate valve 46a of the insulating unit X 'in the paint discharge passage 4b is stopped. 46b is closed and the on-off valves 48a and 48b are opened to allow the insulating liquid R to flow through the straight pipe 40 'of the insulating unit X' in a full state, whereby the insulating unit X in the paint discharge path 4b is passed. ′ Is in an insulating portion forming state.

  Further, in this (f) process part, the insulating unit X ′ in the branch filling path 13a of the first feed tank 3A is used, and the insulating liquid R is applied to the inside of the straight pipe 40 ′ under the shutoff of the partition valves 46a and 46b. Maintain the insulating part formation state to allow flow.

  As described above, in the coating apparatus of the second embodiment, the interior of the straight pipe 40 ′ in the insulating unit X ′ is the insulation target portion S in the middle of the paint discharge paths 4a and 4b and the branch filling paths 13a and 13b. In order to form an insulating part forming means for forming the insulating part filled with the insulating fluid having the insulating property in the insulating target part S in a state where the flow of the paint is cut off, the gate valves 46a, 46b, and an insulating liquid supply path 47b for supplying the insulating liquid R having electrical insulation to the insulating target part S as an insulating fluid, and an insulating drainage liquid for discharging the insulating liquid R from the insulating target part R A structure is adopted in which the passage 47a is connected to the insulation target portion S between the gate valves 46a and 46b in a state where the connection portions to the insulation target portion S are separated in the pipe longitudinal direction.

  Similarly to the first embodiment, the cleaning liquid supply path 32 and the cleaning liquid valve 32a are cleaned by the flow of the cleaning liquid L in place of the paint T inside the straight pipe 40 'in the insulating unit X' as the part to be insulated S. The controller 39 is configured to discharge the paint under the operation of the tank switching valves 11a and 11b, the servo motors 15a and 15b, the filling switching valves 27a and 27b, and the paint switching valves 30a to 30n. Insulation switching means for automatically switching the insulation unit X 'in each of the paths 4a and 4b and the branch filling paths 13a and 13b to be in an insulating state is formed.

  In the second embodiment, the controller 39 as the insulation switching means applies the insulation target portion S (inside the straight pipe 40 'in the insulation unit X') in the insulation portion formation state from the coating gun 1. During the discharge of the paint, the insulating liquid R is allowed to flow through the insulating liquid supply path 47b and the insulating drain path 47a.

Another embodiment
Another embodiment of the present invention will be listed below.
In the first embodiment described above, the insulation target portion S in which the pig 41 is housed is formed by the straight pipe 40. Also in the second embodiment described above, the insulation target portion S through which the insulating liquid L is filled is provided. Although the straight pipe 40 'is used, the insulation target portion S may be formed of a curved pipe or a flexible pipe instead.

  In the first embodiment described above, an example is shown in which the air Ac is contained in the portion to be insulated S (inside the straight pipe 40) to form the insulating portion. Instead, the insulating fluid (electric An insulating portion may be formed by continuously or intermittently flowing an insulating gas or liquid) in a full state with respect to the portion S to be insulated.

  In the first embodiment described above, the pig 41 is reciprocated in the insulation target portion S to clean the insulation target portion S, but the insulation target portion S is cleaned before the formation of the insulation portion. It may be performed only by one-way movement.

  The paint pipe insulating device according to the present invention can be applied to a case where an insulating portion is formed in a single paint supply path in a paint apparatus in which only one paint supply path is connected to the paint gun 1. Further, the target paint T is not necessarily limited to a conductive paint. For example, even if the paint itself is non-conductive, it prevents electrical leakage due to the residual cleaning liquid L in the paint pipeline. For this purpose, the paint pipe insulating device of the present invention can also be used.

  In the above-described embodiment, the feed tanks 3A and 3B having the cylinder structure are shown. However, the feed tanks 3A and 3B for supplying the paint to the coating gun 1 are not limited to those having the cylinder structure, and may be any tube-like one. The number of the supply tanks 3A and 3B is not limited to two, and three or more supply tanks may be provided for one paint gun 1. .

  Further, the pressure feeding means P that pressurizes and supplies the paint T from the feed tanks 3A and 3B to the coating gun 1 is not limited to the piston structure using the servo motors 15a and 15b, and for example, the paint T is applied by compressed air. Any structure such as a structure for supplying pressure to the gun 1 may be used.

  The coating gun 1 that discharges the paint T in a charged state in which a voltage is applied is not limited to a bell-type paint gun, but can be any type such as a type that sprays the paint T with compressed air. Also good.

  The specific structure of the paint path and the arrangement form of each valve interposed in the paint path are not limited to the structure and the arrangement form shown in the above-described embodiment, and various modifications are possible.

  The painting apparatus according to the present invention is not limited to the equipment configuration in which the supply tanks 3A and 3B and the paint switching valves 30a to 30n are mounted on the painting robot 38 together with the painting gun 1, as shown in the above-described embodiment, but various equipment configurations. For example, while the painting gun 1 is installed in the painting robot 38 or the work arm 38a of the automatic painting machine, the supply tanks 3A and 3B and the paint switching valves 30a to 30n are defined as the painting robot 1. You may make it take the equipment form installed in another location.

  The insulating device for paint pipes according to the present invention can be applied to paint pipes for various uses that require electrical insulation by interrupting the paint continuation in the middle of the paint pipe through which the paint flows. In addition, the painting apparatus according to the present invention can be applied to any kind of painting, such as an automobile body, parts of a single vehicle or a bicycle, a casing of home appliances, and furniture.

The circuit diagram which shows the apparatus structure of the coating device in 1st Embodiment. Configuration diagram of insulation unit in the first embodiment Side view showing the equipment configuration of the painting equipment Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation Circuit diagram showing the status of each process in equipment operation The circuit diagram which shows the apparatus structure of the coating device in 2nd Embodiment. Configuration diagram of insulation unit in second embodiment

Explanation of symbols

T Paint 4a, 4b Paint pipe, paint discharge path 13a, 13b Paint pipe, branch filling path S Insulation target portion L Cleaning liquid 32, 32a Cleaning means 42a, 42b Pig operating means, insulation forming means, pressure supply path 43a 43b Pig operating means, insulation forming means, on-off valve 41 pig 45 pig storage part Ac pig operating fluid 40 straight pipe 3A, 3B feed tank P pressure feeding means 1 coating gun 11a, 11b tank switching valve 13 paint filling path 27a, 27b Fill switching valve 30a-30n Paint switching valve 46a, 46b Gate valve R Insulating liquid 47b Insulating liquid path 47a Insulating drain path 48a, 48b On-off valve 49 Liquid tank 39 Insulating switching means

Claims (8)

In addition to providing a cleaning means for cleaning the part to be insulated in the middle of the paint pipeline through which the paint flows by the flow of cleaning liquid instead of the paint,
An insulating device for a paint pipe line provided with an insulating portion forming means for forming an insulating portion filled with an insulating fluid having electrical insulating properties on the insulating target portion in a state where the flow of paint is cut off.
A cleaning pig that is movable in the longitudinal direction of the pipe in a state of sliding in contact with the inner surface of the insulation target part is internally provided in the insulation target part,
A pig storage part for storing the pig in a state where it is retracted from the paint flow path is provided at one end of the part to be insulated,
An insulating device for a paint pipe line provided with a pig operating means for moving the pig over the pig storage part and the other end of the part to be insulated. The pig operating means is configured to move the pig from the pig storage to the other end of the part to be insulated by pressing with the pig operating fluid by supplying the pig operating fluid with pressure to the pig storage, and 2. The structure of moving the pig from the other end of the part to be insulated to the pig storing part by pressurizing the pig operating fluid to the other end of the part to be insulated is pressed by the pig operating fluid. The insulation apparatus for paint pipes as described. While connecting the pressurized supply path of the pig operation fluid to both ends of the insulation target portion formed of a straight pipe, and installing an on-off valve in each of the pressurized supply path on one end side and the other end side,
Either the upstream side portion or the downstream side portion of the paint pipe line with respect to the insulation target part is arranged in the longitudinal direction of the pipe of the insulation target part with respect to the connection portion of the pressure supply path with respect to one end of the insulation target part. The paint pipe insulating device according to claim 2, wherein the insulating device is connected to one end portion of the insulation target portion at a position near the center and in a direction orthogonal to the tube core of the insulation target portion. A coating apparatus using the paint pipe insulating device according to any one of claims 1 to 3,
It is equipped with a paint gun that discharges paint that is pressurized and supplied from a feed tank by pressure feeding means in a charged state by applying voltage.
The paint gun is connected to the paint discharge passages of each of the plurality of feed tanks, and a tank switching valve for selectively switching a feed tank for supplying paint to the paint gun among the feed tanks is provided.
Filling that selectively connects a supply tank to be filled with paint from the paint filling path among a plurality of the supply tanks while connecting a branch filling path branched from the paint filling path to each of the supply tanks A switching valve, and a paint switching valve for switching the paint type of the paint to be filled in the supply tank through the paint filling path,
In this configuration, the part to be insulated provided with the pig storage unit and the pig operation means is provided in each of the paint discharge path and the branch filling path as the paint pipeline,
A coating apparatus equipped with the cleaning means and the insulating portion forming means for these portions to be insulated. In addition to providing a cleaning means for cleaning the part to be insulated in the middle of the paint pipeline through which the paint flows by the flow of cleaning liquid instead of the paint,
An insulating device for a paint pipe line provided with an insulating portion forming means for forming an insulating portion filled with an insulating fluid having electrical insulating properties on the insulating target portion in a state where the flow of paint is cut off.
In order to constitute the insulating portion forming means, a gate valve is interposed at each of both end portions of the insulating target portion in the paint pipeline,
An insulating liquid supply path for supplying an insulating liquid having electrical insulation as the insulating fluid to the insulating target part, and an insulating drain path for discharging the insulating liquid from the insulating target part. In a state in which the connection location for the part is separated in the longitudinal direction of the pipe line, connected to the part to be insulated between the gate valves,
An insulating device for a paint pipe line in which an on-off valve is interposed in the insulating liquid supply path and the insulating drain path. A liquid tank for storing the insulating liquid is provided, and the insulating liquid is supplied from the liquid tank to the insulating target part through the insulating liquid supply path, and the insulating drainage path is supplied from the insulating target part as the insulating liquid is supplied. 6. The paint pipe line insulating device according to claim 5, wherein an insulating liquid discharged to the liquid tank is returned to the liquid tank. A coating apparatus using the paint pipe line insulating device according to claim 5 or 6,
It is equipped with a paint gun that discharges paint that is pressurized and supplied from a feed tank by pressure feeding means in a charged state by applying voltage.
The paint gun is connected to the paint discharge passages of each of the plurality of feed tanks, and a tank switching valve for selectively switching a feed tank for supplying paint to the paint gun among the feed tanks is provided.
Filling that selectively connects a supply tank to be filled with paint from the paint filling path among a plurality of the supply tanks while connecting a branch filling path branched from the paint filling path to each of the supply tanks A switching valve, and a paint switching valve for switching the paint type of the paint to be filled in the supply tank through the paint filling path,
In this configuration, the insulating liquid supply passage and the insulating drainage passage interposed with the on-off valve are connected, and the insulating target portion provided with the gate valve is used as the paint discharge passage as the paint conduit. And each of the branch filling paths,
A coating apparatus equipped with the cleaning means and the insulating portion forming means for these portions to be insulated. The insulation of the parts to be insulated in each of the paint discharge passage and the branch filling passage in cooperation with the operation of the tank switching valve, the pressure feeding means, the filling switching valve, and the paint switching valve. Insulation switching means for automatically switching the part to be insulated to be formed is provided,
The insulation switching means allows the insulation liquid to flow through the insulation liquid supply path and the insulation drainage path during the discharge of the paint from the coating gun to the insulation target portion in which the insulation portion is formed. The coating apparatus according to claim 7, which is configured to be in a state.

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