JP5646811B2 - Coating liquid supply system - Google Patents

Description

  The present invention relates to a looped end type coating liquid supply system.

A conventional looped end type coating liquid supply system shown in Non-Patent Document 1 is known.
Nippon PCS Internet Web Page Internet <URL: http://www.j-pcs.com/pcsystem/index.html>

The above prior art has the following problems.
Since paint residue adheres to the inner wall of the main pipeline or the like , it is necessary to periodically ask the cleaning company to clean the pipeline inner wall, which raises the problem of high maintenance costs. In addition, when changing the coating color, there is a problem that the maintenance cost is high in that a lot of cleaning agent is used and a large amount of waste liquid is generated.

The object of the present invention is to remove the main pipe inner wall and the branch pipe inner wall branched from the main pipe with the main pipe pig and the branch pipe pig respectively, and to clean the used pre-coating material. An object of the present invention is to provide a coating liquid supply system that can extrude and recover waste liquid efficiently and has a low maintenance cost.

(About claim 1)
The main pipeline is formed by interposing a paint tank, an electric paint pump, and a paint back pressure valve in the pipeline, and connecting the pipelines in an annular shape.
Launcher conduit includes a launcher-side valve, a pig launcher tube having a pressure relief valve, and ligated into the pipe and a drain pipe which is disposed a run-char drain valve from the base end side in this order, the electric paint pump The base end of the pipe is connected to the main pipe downstream from the outlet.
The catcher pipe connects a catcher side valve , a pig catcher pipe having a catcher side pressure relief valve, and a drain pipe provided with a cleaning liquid valve into the pipe line in this order from the base end side , and the pipe base end will be described later. It is connected to the main pipeline located downstream from the proximal end connection site of the branch pipeline .
The main pipeline pig can be moved in a watertight manner in the main pipeline between the piglancher pipeline and the pig catcher pipeline .

Edakanro the branch portion outlet valve, and a branch holder connecting the discharge valve interposed in order to branch pipe proximally booth extraction valve, extraction block was ligated drain Lee Nbarubu, and a cleaning agent injection valve A branch pipe base end is connected to a portion located between the outlet of the electric paint pump in the main pipe and the inlet of the paint back pressure valve.
The branch pipe pig is arranged in a section located between the branch pipe take-out block and the branch holder, and is capable of watertight movement in the branch pipe.

Here, the inside of the branch pipe is washed as follows.
First, with the cleaning liquid or paint filled in each pipeline, the electric paint pump is turned on. Squeeze the paint back pressure valve to increase the fluid pressure in the main line.
Then open the branch outlet valve and drain valve, and supply the cleaning liquid injection valve and block. Close the tube take-off valve and push the branch pipe pig in the branch holder with the liquid pressure in the main pipe. After moving into the block and draining the liquid in the branch pipe, close the drain valve.

Next, stop the electric paint pump and open the paint back pressure valve to zero the fluid pressure in the main line. Open the cleaning liquid injection valve to inject the cleaning liquid into the branch pipe, and use the branch pipe in the extraction block. Is pushed into the branch holder by pressing with the cleaning liquid pressure.
Note that zero liquid pressure means the liquid in the main and branch pipes when the electric paint pump is stopped. Pressure, which is approximately equal to atmospheric pressure.
As a result, when the branch pipe pig moves between the take-out block and the branch holder, The inner wall of the branch pipe is oystered and cleaned by a branch pipe pig.

In addition, cleaning in the main pipeline is performed by moving the main pipeline pig in the main pipeline.
  As a result, the main pipe pig is connected between the piglancher pipe and the pig catcher pipe. When moving inside, the inner wall of the main pipe is removed and cleaned.
Therefore, the main pipe inner wall and the branch pipe inner wall are respectively changed to a main pipe pig and a branch pipe pig. Oyster removal can be cleaned, and the inner wall of the main pipeline and the inner wall of the branch pipeline can be cleaned regularly by a contractor. There is no need to request, and the maintenance cost is low.

(About claim 2)
The cleaning of the main conduit, first, closing the outlet valve preparative bifurcation, open the launcher side valve and calibration Tcha side valve, opens the cleaning liquid valve injecting a cleaning liquid into main conduit, open the launcher drain valve, pig the main line pig catcher tube push back in the cleaning liquid pressure to Piguran char tube direction, to discharge the liquid main conduit via the launcher drain valve.
Then, after closing the cleaning liquid valve, the pressure in the main line is made zero.
Then it poured from the launcher drain valve the cleaning liquid into the main conduit, the washing liquid valve had opened, the washing liquid valve the liquid main conduit back press main conduit pig of the pig launcher tube to pig catcher tube direction with a cleaning liquid pressure Discharged through.
This is one specific example of cleaning in the main pipeline.

(Claim 3 )
Main line for pin grayed is composed of a pair of the spherical portion located at both ends, and a bobbin-like portion located at the center, and the spherical portion and a cylindrical portion for connecting the left and right ends of the bobbin-shaped part.
The spherical parts at both ends allow the pig to move smoothly in the main pipe line, and the large end of the bobbin-shaped part ensures that the debris attached to the inner wall of the main pipe line between the launcher pipe and the catcher pipe Can be taken.

(About claim 4 )
A main conduit for Pi in grayed buried magnetic body, the pig launcher tube and pig catcher tube is arranged detectable Pigusensa a magnetic material.
Based on the sensor signal output from the pig sensor, it is possible to easily grasp whether or not the main pipeline pig has reached the piglancher pipe or the pig catcher pipe.

The coating liquid supply system
A main line formed by connecting a paint tank, an electric paint pump, and a paint back pressure valve in the pipe, and connecting the pipes in an annular shape;
A launcher-side valve, a pig launcher tube having a pressure relief valve, and ligated into the pipe and a drain pipe which is disposed a launcher drain valves from the base end side in this order, downstream of the outlet of the electric paint pump A launcher pipe having a pipe base connected to the main pipe,
Bifurcation outlet valve, and a branch holder connecting the discharge valve interposed in order to branch pipe proximally booth extraction valve, extraction block connecting the drain Lee Nbarubu, and a cleaning liquid injection valve Edakanro distal end A branch pipe connected in order, and a branch pipe proximal end connected to a portion located between the outlet of the electric paint pump of the main pipe and the inlet of the paint back pressure valve;
A branch pipe that is arranged in a section located between the branch pipe take-out block and the branch holder and is capable of watertight movement in the branch pipe;
And catcher side valve, a pig catcher tube having a catcher side pressure vent valve, wash solution and ligated into the conduit and a drain tube which is disposed the valve from the base end side in this order, branch pipe group of the pipe base end A catcher pipe connected to the main pipe located downstream from the end connection site ;
The main conduit between the pig launcher conduit and pig catcher line and a watertight manner movable main conduit for pin grayed.

The branch pipes are washed as follows.
First, with the cleaning liquid or paint filled in each pipeline, the electric paint pump is activated, and the paint back pressure valve is throttled to increase the fluid pressure in the main pipeline.
Then, open the outlet valve and the drain valve preparative bifurcation, closing the cleaning liquid injection valve and booths extraction valve, press branch road pig in the branch holder in the liquid pressure in the main conduit is moved into extraction block, After draining the liquid in the branch pipe, close the drain valve.
Next, stop the electric paint pump, open the paint back pressure valve to zero the liquid pressure in the main line, open the washing liquid injection valve, inject the washing liquid into the branch line, and use it for the branch line in the extraction block Push the pig with cleaning fluid pressure and move it into the branch holder.
In addition, the main pipeline is cleaned as follows.
First, close the outlet valve preparative bifurcation, open the launcher side valve and catcher side valve, opens the cleaning liquid valve injecting a cleaning liquid into main conduit, the launcher drain valve had opened, a pig for main line of the pig catcher tube back press with a cleaning fluid pressure to the pig launcher tube direction, the liquid main conduit for discharging through the launcher drain valve.

Next, after closing the cleaning liquid valve, the pressure in the main line is made zero.
Then, injected from the launcher drain valve the cleaning liquid into the main conduit, the washing liquid valve had opened, the washing liquid valve the liquid main conduit back press main conduit pig of the pig launcher tube to pig catcher tube direction with a cleaning liquid pressure The inside of the main pipeline is washed through the exhaust.

When the branch pipe pig moves in the branch pipe between the branch holder and the take-out block, the inner wall of the branch pipe is removed and cleaned. Similarly main line for pin grayed is, when moving the main conduit between the pig launcher tube and pig catcher tube, between main conduit inner wall is scraped clean. To scraping clean the branch pipe road pig and the main conduit for pin grayed paint sludge adhered to the branch pipe and main pipe line the inner wall, to ask the cleaning periodically main conduit inner wall and Edakanro inner wall skilled There is no maintenance cost.

A coating liquid supply system T according to a first embodiment of the present invention will be described with reference to FIGS.
The coating liquid supply system T has a paint tank 11, an electric paint pump 12, and a paint back pressure valve 13 interposed in a pipeline, and the pipeline is connected in a ring shape, a launcher side valve 21 and a drain. A launcher pipe 20 connecting the pipe 22 and the piglancher pipe 2 in the pipe, a catcher pipe 30 having a catcher side valve 31 and a pig catcher pipe 3 in the middle of the pipe, and a branch outlet valve 41, comprises a branch holder 4 branch pipe 40 the and extraction block 5 are connected in this order, and branch pipe pig 7, a main conduit pig 6, the controller (not illustrated).
The main pipe 10 is provided with a pressure sensor for detecting the pressure of the paint circulating in the pipe and a flow rate sensor for detecting the amount of the paint circulating in the pipe.

The paint tank 11 is filled with paint for painting.
The electric paint pump 12 is for circulating the paint in the main pipeline 10, and pressure is applied to the paint in the main pipeline 10 by circulating the paint.
The paint back pressure valve 13 is an air operated type, and the opening degree can be increased or decreased depending on the energization amount of the controller.

The launcher pipe line 20 has a pipe line base end connected to the main pipe line 10 downstream from the outlet of the electric paint pump 12, and the pipe line tip is connected to another coating unit (not shown).
Launcher conduit 20 includes a launcher side valve 21, and Piguranchi catcher over tube 2 having a pressure relief valve 23, and ligated into the pipe and a drain pipe 22 which is disposed launcher drain valve 24 in this order on the base end side Karako (See FIG. 2).

The catcher pipe line 30 is formed by connecting a catcher side valve 31, a pig catcher pipe 3 having a catcher side pressure release valve 35 , and a drain pipe 32 provided with a cleaning liquid valve 34 into the pipe line in this order from the base end side. Yes. Then, the catcher line 30 is connected to the main line 10 at the downstream position from the base end connection portion of the branch pipe 40 a pipe proximal end.
The pig catcher tube 3 is provided with a reed switch s1 (pig sensor) for detecting the magnet (magnetic material) of the main pipe pig 6 and a patrol (registered trademark) 33 that operates when the contact of the reed switch is closed. Has been .
One side of the branch holder 4 is connected to the downstream side of the branch portion outlet valve 41, and a discharge pipe 43 provided with a discharge valve 42 is connected in the middle of the holder.

Extraction block 5 is connected to the cleaning liquid injection tube 52 which is disposed a cleaning liquid injection valve 51, the booth takeout pipe 54 which is disposed booth extraction valve 53, and a drain Lee down pipe 56 disposed drain Lee Nbarubu 55 ing. A coating device (not shown) is connected to the booth extraction pipe 54 downstream of the booth extraction valve 53, and a coating command signal is sent from the coating device at the time of painting.
Even the branch holder 4 and take-out block 5, a reed switch for detecting the magnet (magnetic substance) of branch pipe pig 7 (Pigusensa) is disposed.

Pig 6 is a main line, the spherical portion 61, 61 located at both ends, a bobbin-like portion 62 of the pig detector located in the center, connecting the left and right ends of the spherical portion 61 and the bobbin-shaped portion 62 cylinder Part 63. Incidentally, the magnet (magnetic body) is embedded in the main channel pig 6.

Branch pipe pig 7 connected to the spherical portion 71, 71 located at both ends, a bobbin-like portion 72 of the pig detector located in the center, the left and right ends of the spherical portion 71 and the bobbin-shaped portion 72 It consists of a cylindrical part 73. A magnet (magnetic material) is embedded in the branch pipe pig 7 .
The controller controls the capacity of the electric paint pump 12 and the opening degree control of the paint back pressure valve 13.

Next, paint removal from the branch pipe 40, paint removal from the main pipe 10, cleaning of the branch pipe 40, and washing of the main pipe 10 will be described together with advantages.
(Paint removal from branch pipe 40)
When the painting operation is finished and an instruction to stop the circulation of the paint is given, the controller stops the electric paint pump 12 (energization is stopped) and opens the paint back pressure valve 13 (energization is stopped).
The controller confirms that the pressure is zero and the flow rate is zero based on sensor signals from the pressure sensor and the flow rate sensor.

As preparation for starting paint recovery, the booth take-off valve 53 is manually closed.
Next, the cleaning liquid injection valve 51 is manually opened, and a cleaning agent (hydrophilic thinner) is pressurized and injected into the branch pipe line 40 from the cleaning liquid injection pipe 52.

Branch pipe pig 7 by washing agent injected under pressure is pushed back into the main conduit 10 direction, whereby the coating material in the Edakanro 40 is recovered into main conduit 10.
That branch pipe pig 7 reaches the branch holder 4, the reed switch branch holder 4 (Pigusensa) detects, regarded as paint recovery is complete.
The cleaning liquid injection valve 51 is manually closed (injection of the cleaning agent), and the paint removal from the branch pipe is completed.

(Remove paint from main line 10)
When the painting operation is finished and an instruction to stop the circulation of the paint is given, the controller stops the electric paint pump 12 (energization is stopped) and opens the paint back pressure valve 13 (energization is stopped).
The feed side valve 14 and the return side valve 15 are manually closed.

  The pressure injection of the cleaning agent (hydrophilic thinner) into the main pipe 10 is started from the drain pipe 22 of the piglancher pipe 2, and the launcher side valve 21 and the catcher side valve 31 are manually opened. Then, the branch outlet valve 41 is manually closed.

Main line pig 6 of the pig launcher tube 2 is pushed by the detergent, it recovered paint from drain Lee down tube 32.
When the reed switch detects that the main pipe pig 6 has reached the pig catcher pipe 3, it is considered that the paint removal from the main pipe 10 has been completed. Then, the launcher side valve 21 is manually closed, the launcher side pressure release valve 23 is manually opened, the catcher side valve 31 is manually closed, and the catcher side pressure release valve 35 is manually opened.
To manually open valve state main line pressure relief valve (not shown) provided between the launcher side valve 21 and the catcher side valve 31, the feed-side valve 1 4 with the main conduit pressure to zero, the return The side valve 15 is manually opened.

(Washing of branch pipe 40)
Branch pipe pig 7 is in the branch holder 4, the main conduit pig 6 is in the pig catcher tube 3, outlet valve 41 preparative bifurcation is in the open state.
When the washing of the branch pipe 40 is instructed, the controller operates (energizes) the electric paint pump 12 to bring the paint back pressure valve 13 into the throttled state (energized), and sets the pressure of the cleaning agent in the main pipe 10. increase.

Since the main conduit pressure> branch pipe internal pressure, the pressure of the cleaning agent in the main conduit 10, the branch pipe pig 7 branches holder 4 is pushed into the extraction block 5 direction, the drain Lee Nbarubu 55 waste liquid is discharged from the drain Lee down tube 56 that is manually opened.

When branch pipe pig 7 reed switch of the take-out block 5 the arrival (Pigusensa) detects the removal block 5, considers cleaning Edakanro 40 is completed, the controller is deactivated the electric paint pump 12 (Energization is stopped), the paint back pressure valve 13 is opened (energization is stopped), and the pressure of the cleaning agent in the main pipeline 10 is reduced to zero. It should be noted that, to close the drain Lee Nbarubu 55 manually.
The controller confirms that the pressure is zero and the flow rate is zero based on sensor signals from the pressure sensor and the flow rate sensor.

The cleaning liquid injection valve 51 is opened manually, detergent starts pressurization injection into branch pipe 40 of the (hydrophilic thinner), the branch pipe pig 7 of the take-out block 5 by the detergent branch holder 4 Push in direction (outward wash). In this case, the paint sludge adhered to the branch pipe inner wall branch pipe path pig 7 takes oysters.

Then, pressurized injection into the washing liquid injected from the valve 51 of the cleaning agent branch pipe 40 of the stop, it pushes the branch pipe pig 7 to extraction block 5 direction by cleaning liquid pressure of the main conduit 10.
Reed switch of the take-out block 5 (Pigusensa) to confirm that the branch pipe pig 7 reaches the take-out block 5. Closes the drain Lee Nbarubu 55 of drain Lee down tube 56 manually cleaning Edakanro 40 (backward cleaning) is completed.

Buried magnet (magnetic body) in the branch pipe pig in 7, are arranged in the branch holder 4 and take-out block 5 reed switch (Pigusensa) for detecting a magnet (magnetic body). Therefore, it is possible to Pigusensa is the sensor signal output, branch road pig 7 to extraction block 5 or branched holder 4 is easily grasp whether reached.

(Cleaning of main pipeline 10)
The catcher side valve 31 of the pig catcher pipe 3 is manually opened, and the launcher side valve 21 of the piglancher pipe 2 is manually opened.
The cleaning liquid valve 34 of the drain pipe 32 is manually opened, the launcher drain valve 24 of the piglancher pipe 2 is manually opened, and the cleaning liquid is injected from the drain pipe 32 into the main pipeline 10 to form a pig catcher pipe. The main line pig 6 located at 3 is pushed in the direction of the piglancher pipe 2 with the washing liquid pressure, and the waste liquid (paint + washing liquid) in the main pipe line 10 is discharged from the drain pipe 22 of the piglancher pipe 2.

When main conduit pig 6 moves within the main conduit 10 toward the pig catcher tube 3 to the pig launcher tube 2, because the paint sludge adhered to the inner wall of the main conduit 10 is the main conduit for pig 6 scraping, skilled It is not necessary to regularly request cleaning of the inner wall of the main pipe line 10, and the maintenance cost is low. Main line pig 6, the spherical portion 61 at both ends, the main conduit 10 can be smoothly moved, the large diameter end of the bobbin-shaped portion 72, reliably oysters debris adhering to the main line 10 the inner wall Can be taken.

Main line pig 6 is detected by the reed switch that has reached the pig launcher tube 2.
Buried magnet main conduit pig 6, are disposed reed switch for detecting the magnet pig catcher tube 3 (in pig launcher tube 2). Therefore, in the time of cleaning the main conduit 10, the sensor signal Pigusensa outputs, easily ascertain whether the pig catcher tube 3 (or pig launcher tube 2) main conduit pig 6 into reaches Can do.

It closes the washing liquid valve 34 of the pig catcher tube 3 manually stops the pressurization by detergents. The main line pressure relief valve is manually opened to reduce the pressure in the main line 10 to zero .

Next, is moved to a pig catcher tube 3 push the main conduit pig 6 of Pi Gran char tube 2 in the cleaning agent to the waste liquid is discharged from the drain Lee down tube 32.

Main line pig 6 is pushed by the detergent, when moving in the main line 10 toward the pig launcher tube 2 to the pig catcher tube 3, main conduit pig paint sludge adhered to the inner wall of the main conduit 10 Since oysters 6 are removed, there is no need to periodically ask the contractor to clean the inner wall of the main pipeline 10 and the maintenance cost is low. Main line pig 6, the spherical portion 61 at both ends, the main conduit 10 can be smoothly moved, the large diameter end of the bobbin-shaped portion 6 2, to ensure debris adhering to the main line 10 the inner wall You can take oysters.

When the main lines pig 6 reed switch that has reached the pig catcher tube 3 is detected, the cleaning of the main conduit 10 is completed. As post-processing, the launcher side valve 21 is manually closed, the launcher side pressure release valve 23 is manually opened, the catcher side valve 31 is manually closed, and the catcher side pressure release valve 35 is manually opened. To do. Then, the main line pressure relief valve was manually opened valve state to the main line pressure to zero.

It is a piping diagram of the coating liquid supply system which concerns on Example 1 of this invention. It is explanatory drawing which shows the structure of the piglancher pipe | tube used for the coating liquid supply system. It is explanatory drawing which shows the structure of the pig catcher pipe | tube used for the coating liquid supply system. It is explanatory drawing which shows the structure of the extraction block used for the coating liquid supply system.

T coating liquid supply system 2 pig launcher tube 3 pig catcher tube 4 branch holder 5 takeout block 6 main conduit pig 7 branch pipe pig 10 main line 11 paint tank 12 electric paint pump 13 paint back pressure valve 20 launcher conduit 21 launcher Side valve 30 Catcher pipe 31 Catcher side valve 40 Branch pipe 41 Branch outlet valve

Claims (4)

A main line formed by connecting a paint tank, an electric paint pump, and a paint back pressure valve in the pipe, and connecting the pipes in an annular shape;
A launcher-side valve, a pig launcher tube having a pressure relief valve, and ligated into the pipe and a drain pipe which is disposed a launcher drain valves from the base end side in this order, downstream of the outlet of the electric paint pump A launcher pipe having a pipe base connected to the main pipe,
Bifurcation outlet valve, and a branch holder connecting the discharge valve interposed in order to branch pipe proximally booth extraction valve, extraction block connecting the drain Lee Nbarubu, and a cleaning liquid injection valve Edakanro distal end A branch pipe connected in order, and a branch pipe proximal end connected to a portion located between the outlet of the electric paint pump of the main pipe and the inlet of the paint back pressure valve;
A branch pipe that is arranged in a section located between the take-out block of the branch pipe and the branch holder, and is capable of watertight movement in the branch pipe;
And catcher side valve, a pig catcher tube having a catcher side pressure vent valve, and ligated into the pipe and a drain pipe which is disposed a wash solution valve from the base end side in this order, before the conduit proximal Kiedakanro A catcher pipe connected to the main pipe located downstream from the base end connection site of
Wherein a watertight manner pig for movable main conduit the main conduit between the pig launcher conduit and said pig catcher conduit,
Cleaning the branch pipes
With the cleaning liquid or paint filled in each pipeline, the electric paint pump is activated, the paint back pressure valve is throttled to increase the fluid pressure in the main pipeline,
Open the outlet valve and the drain valve preparative said branch portion, closing the cleaning solution injection valve and the booth removal valve,
Push the branch pipe pig in the branch holder with the liquid pressure in the main pipe and move it into the take-out block, and after draining the liquid in the branch pipe, close the drain valve,
Stop the electric paint pump, open the paint back pressure valve to zero the fluid pressure in the main line ,
Open the cleaning liquid injection valve and inject the cleaning liquid into the branch pipe , and perform the branch pipe pig in the take-out block by pressing the cleaning liquid pressure and moving it into the branch holder,
The cleaning of the main conduit, coating liquid supply system, wherein the main conduit pig is performed by moving the main conduit. Said cleaning main conduit, said closing the branch portion outlet valve, open the launcher side valve and the catcher side valve, open the washing liquid valve injecting a cleaning liquid into main conduit, said launcher drain valve , Push the pig for main pipe in the pig catcher pipe back toward the piglancher pipe with the washing liquid pressure, and discharge the liquid in the main pipe through the launcher drain valve,
After closing the cleaning liquid valve, the main line pressure is zero,
Then, the poured from the launcher drain valve the cleaning liquid into the main conduit, said open cleaning liquid valves, main conduit the main line pig of the pig launcher tube pushes back with a cleaning fluid pressure to the pig catcher over pipe direction The coating liquid supply system according to claim 1, wherein the liquid is discharged through the cleaning liquid valve . Before SL main line for pin grayed includes a pair of spherical portions located at both ends, and a bobbin-like portion located at the center, that consists of a cylindrical portion connecting the left and right ends of the bobbin-shaped portion and the spherical portion The coating liquid supply system according to claim 1 or 2, characterized in that The magnetic body is embedded in the main conduit for pin within grayed,
The coating liquid supply system according to any one of claims 1 to 3, wherein a pig sensor capable of detecting the magnetic material is disposed in the piglancher tube and the pig catcher tube.

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