JP3231097B2 - Paint piping cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint pipe cleaning apparatus for cleaning a paint pipe connecting a manifold having a plurality of color change valves and a paint gun with a thinner supplied to the manifold from a thinner supply source.

[0002]

2. Description of the Related Art In a top coating process of an automobile body, a vehicle body of a different paint color flowing on a line is painted with a common paint gun, so that each time the paint color is changed, a paint pipe connected to the paint gun is cleaned. In addition, it is necessary to prevent the coating quality from being deteriorated due to the mixing of paints of other colors.

FIG. 2 shows a conventional paint pipe cleaning apparatus.

As shown in FIG. 1, a plurality of (for example, six) color change valves 2 provided in a manifold 1 are provided.
₂₁ to the _six, the first color change valve 2 ₁ paint supply pipe L in which a paint pump 3 and the paint supply valve 4
₁ is connected to a paint can 5A containing the paint of the first color. Furthermore, the first color change valve 2 ₁ and paint can 5
A is a paint circulation pipe L ₂ provided with a back dam pump 6.
Connected via Although not shown, in the second to fifth color change valve 2 _{2-2 5} remaining, the second color-fifth color having a first same structure as that of the color change valve 2 ₁ above Each paint supply system is connected. Also, the end of the sixth color change valve 2 ₆ is connected to the thinner the can 9 through the thinner supply pipe L ₃ in which a thinner pump 7 and the thinner supply valve 8.

[0005] The outlet of the manifold 1 is a regulator 1
0, is connected to the spray gun 13 through the paint supply pipe L ₄ having a filter 11 and a trigger 12. Then, from between the filter 11 and the trigger 12 of the paint supply pipe L _4, the discharge pipe which L ₅ branches having a dump valve 14, the distal end of the discharge pipe L ₅ represents it is connected to the discharge tank 15.

[0006] Next, the case of coating with a first color paint, for example, will be described.

The first color paint stored in the paint can 5A is:
In order to prevent curing, paint supply pipe L ₁ provided with a paint pump 3 and the paint supply valve 4, constituted by the paint circulation piping L ₂ having a first color change valve 2 ₁ and the back dam pump 6, Circulating closed circuit. When first opening the color change valve 2 ₁ so as to start painting, the first color coating material which has flowed from the paint supply pipe L ₁ to the manifold 1, the regulator 10, paint supply pipe L provided with a filter 11 and a trigger 12 ₄ and sprayed from the coating gun 13. At this time, the dump valve 14 provided in the exhaust pipe and L ₅ is in closed state, the paint supply pipe L ₄
The communication with the discharge tank 15 is shut off.

When the coating with the first color paint is completed, the paint can 5A is replaced with a thinner can 5B, and the paint supply pipe L ₁ and the first color change valve 2 _{1 through which} the first color paint has been circulated. and washed by circulating thinner the paint circulation piping L _2.

While the upstream portion of the manifold 1 is cleaned as described above, the downstream portion of the manifold 1,
That is, the space between the manifold 1 and the coating gun 13 is cleaned as follows.

First, the thinner pump 7 is driven with the trigger 12 closed and the dump valve 14 opened, and the thinner supply pipe L ₃ provided with the thinner pump 7 and the thinner supply valve 8, the sixth color change valve 2. _6, the manifold 1 through the discharge pipe L ₅ having a regulator 10 and filter 11 and the paint supply pipe L ₄ and dump valve 14 provided with supplies thinner housed in thinner cans 9 to the discharge tank 15, which To clean the space between the thinner can 9 and the discharge tank 15. Followed by closing the dump valve 14 is opened to trigger 12, the remaining unwashed portions, i.e. the end portion of the paint supply pipe L ₄ Trigger 12
Then, the coating gun 13 is washed.

[0011] As described above, the first color paint to residual Once cleaned all painted by the second color paint is started by opening e.g. a second color change valve 2 _2.

[0012]

[SUMMARY OF THE INVENTION Incidentally, in order to perform the painting work efficiently, it is necessary to complete the cleaning of the paint supply pipe L ₄ of the downstream manifold 1 described above in a short time of about 10 seconds . However, it is difficult to completely wash the paint remaining in a short time, if trouble such as clogging of the stenosis and the spray gun 13 of the pipe and settle the paint within the paint supply pipe L ₄ for this to occur there were.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paint pipe cleaning apparatus capable of reliably cleaning remaining paint without affecting a painting operation.

[0014]

To achieve the above object of the Invention The present invention relates to coating piping connecting the manifold and the coating gun having a plurality of color change valve, the coating
A trigger that can open and close the feed pipe near the paint gun
From the upstream of the paint pipe trigger,
Branch that can be opened and closed by the
Connect the discharge tank to the downstream end of the outlet pipe, close the trigger
With the dump valve open, remove the manifold from the thinner supply.
Above trigger by thinner supplied to hold
Make sure to clean the flow paint pipes and open the trigger.
When the dump valve is closed,
From the trigger by the thinner supplied to the manifold
In <br/> paint pipe cleaning apparatus adapted to clean the downstream paint pipe and the spray gun, dump valve of the discharge pipe
A switching valve is provided downstream of the
Connect the branched return pipe to the thinner supply source,
For the valve, the discharge pipe upstream of it is called the return pipe,
Selectively communicates with the discharge pipe downstream of the switching valve
And characterized in that.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a paint pipe cleaning apparatus according to an embodiment of the present invention. In FIG. 1, the same components as those of the above-mentioned conventional paint pipe cleaning apparatus (see FIG. 2) are denoted by the same reference numerals. is there.

The paint pipe cleaning apparatus of this embodiment, the switching valve 16 to a position downstream of the dump valve 14 in discharge line L ₅
The present invention is characterized in that a return pipe L ₆ branched from the switching valve 16 is connected to the thinner can 9.
Other configurations are the same as those in FIG.

Normally, the switching valve 16 is in the right position, and the dump valve 14 is in communication with the discharge tank 15. And at the time of color change, in the same manner as described above, first, in a state in which close the trigger 12 to open the dump valve 14, the thinner from the thinner the can 9 via the manifold 1, the paint supply pipe L ₄ and the discharge pipe L ₅ To the discharge tank 15, and the thinner can 9 and the discharge tank 15
Between the paint and the washing, paint is mixed relatively much
Dirty thinner is efficiently collected in the discharge tank 15.
Re that. Then closes the dump valve 14 opens the trigger 12, the trigger 12 and the spray gun 13 is unwashed portions of the end of the paint supply pipe L ₄ Wash with thinner.

[0019] Now, at the time of rest of the coating lines, such as lunch time, the switching valve 16 is switched to the left position shown in FIG. 1, the discharge pipe L ₅ represents is connected to the feedback pipe L ₆ is disconnected from the discharge tank 15. Thereby, the thinner can 9
From the thinner supply pipe L ₃ , the sixth color change valve ₂₆ , the manifold 1, the paint supply pipe L ₄ , the discharge pipe L ₅ , the switching valve 16 and the return pipe L _6.
Circulating a closed circuit for recirculating the thinner the can 9 via the paint adheres easily paint supply pipe L ₄ is sufficiently cleaned in the meantime. At this time , the thinner, which is almost clean, circulates through the closed circuit, so that the amount of use is extremely small. Thus,
During the coating line resume, switching the switching valve 16 in the right position, the first through fifth color change valve 2 ₁ to 2
_The valve is opened and the painting operation is restarted.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made.

[0021]

As described above, according to the present invention , a trigger is provided near a paint gun on a paint pipe connecting a manifold having a plurality of color change valves and a paint gun .
From the upstream of the paint pipe trigger,
Branch the discharge pipe that can be opened and closed by the
Connect a discharge tank to the downstream end of the discharge pipe of
With the trigger closed and the dump valve open,
The thinner supplied to the manifold from the supply source
Cleaning the paint pipe upstream of the trigger.
Therefore, the paint thinner above the trigger must be
Cleaning can be performed effectively, and after the cleaning process
Dirty thinner can be efficiently collected in the discharge tank
it can. Open the trigger and close the dump valve.
In the state supplied from the thinner supply source to the manifold.
The inside of the paint pipe downstream of the trigger and the paint
Because the gun was cleaned,
Effectively use paint thinner in paint piping and paint gun
Can be washed.

Further downstream from the dump valve of the discharge pipe
A switching valve is provided at the position, and branches from this switching valve.
Connect the return pipe to the thinner supply
However, the upstream discharge pipe is switched to the return pipe.
Selectively communicate with the discharge pipe downstream of the valve
When the paint line is temporarily stopped, the switching valve
Switch the discharge pipe upstream of the valve to the return pipe
If communication is established, paint pipes and return pipes
In a closed circuit composed of
Can be circulated for a long time,
Paint remaining in the paint supply piping after the previous cleaning process.
The material can be washed effectively. Moreover, for this cleaning
Thinner used is because only circulates the closed circuit, the amount used is economical been finished in very small amounts.

In addition, the system after cleaning and passing the paint pipes
The inner surface of the cleaner, the degree of dirt, and the operation of the coating line.
Collect in the discharge tank or supply thinner according to
Whether to circulate to the source side is simply a switching operation of the switching valve
Because as possible de be switched more easily, its handling Misao
The work is very simple and the work efficiency can be improved. Ma
The discharge pipe between the paint pipe and the switching valve
For the discharge line to the heat sink and the circulation line to the thinner supply source.
Can simplify the piping configuration.
Wear.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a paint pipe cleaning apparatus according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a conventional paint pipe cleaning apparatus.

[Explanation of symbols]

1 manifold 2 ₁ to 2 ₆ color change valve 9 thinner cans (thinner supply source) 12 Trigger 13 the painting gun 14 dump valve 15 discharge tank 16 changeover valve L ₄ paint supply pipe (paint pipe) L ₅ discharge line L ₆ feedback pipe

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-54971 (JP, A) JP-A-61-204059 (JP, A) JP-A-3-202169 (JP, A) JP-A-4- 156967 (JP, A) JP-A 2-129279 (JP, U) JP-A 4-65156 (JP, U) JP-A 1-122867 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B05B 12/14 B05B 15/02 B05C 11/10 B08B 9/027

Claims (1)

(57) [Claims] A plurality of color change valves (2 ₁ to 2)
₆ ) the paint pipe (L ₄ ) connecting the manifold (1) having the paint gun (13) to the paint pipe (L ₄ ).
Open and close the trigger (12) near the paint gun (13).
A trigger (1) for this paint pipe (L ₄ )
2) Open / close by the dump valve (14) from the upstream position
Divide the possible discharge pipe (L ₅ ) and discharge it
Connect the discharge tank (15) to the downstream end of (L ₅ )
Gir (12) closed and dump valve (14) open
To supply the manifold (1) from the thinner supply source (9).
By the thinner supplied, the upstream of the trigger (12)
Clean the inside of the paint pipe (L ₄ )
With (12) open and the dump valve (14) closed,
Supplied from the thinner supply source (9) to the manifold (1).
Paint downstream of the trigger (12)
Clean the inside of the pipe (L ₄ ) and the paint gun (13)
In the paint pipe cleaning device, the discharge pipe (L ₅ ) is located downstream of the dump valve (14).
Is provided with a switching valve (16).
The return pipe (L ₆ ) branched from ₆ ) is supplied to the thinner supply source.
(9), and this switching valve (16) is connected to a discharge line upstream of the switching valve (16).
The pipe (L ₅ ) is connected to the return pipe (L ₆ ) and the switching valve (1).
6) Selectively communicate with the downstream discharge pipe (L ₅ ).
A paint pipe cleaning device characterized by the following: