JP2002210396A - Washing device of coating device and washing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing device of a coating device capable of enhancing a workability by effectively using a coating material and shortening a color- change time. SOLUTION: In the coating device, a coating material is fed to a coating gun 3 by a coating pump through a feed passage 2 and coating is carried out. A washing passage 6 communicating with a feed source of the washing water is connected to a middle of the feed passage 2 and a drain passage 11 at a pump side is connected to the feed passage 2 being at an upstream side as compared with the washing passage 6. An air can be fed from an air feed source 10 to the washing passage 6. A first close valve 8 is disposed on the washing passage 6, a second close valve 12 is disposed on the drain passage 11 at a pump side and a third close valve 13 is disposed on the feed passage 2 formed between the washing passage 6 and the drain passage 11 at a pump side. After the air is fed to the feed passage 2 to wash with the air, the washing water is fed to the painting pump 1 side and the coating gun 3 side by another route to wash it. An air is mixed into the washing water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus for a coating apparatus and a method for cleaning the same.

[0002]

2. Description of the Related Art Conventionally, as a coating apparatus, as shown in FIG. 2, a coating material stored in a coating tank (not shown) is supplied to each coating gun c through a supply path b by a coating pump a. We are painting objects to be painted.

When the color of the paint is changed, the paint pump a, the supply passage b, and the paint gun c are once cleaned to avoid mixing of the paint before and after the paint. , Use new paint.

In this cleaning operation, a water tank storing water is arranged on the suction side of the coating pump a, and the water in the water tank d is supplied to each coating gun c through the supply path b by the coating pump a. This is done by collecting through drainage channel e.

[0005]

However, if the coating pump a, the supply path b and the coating gun c are washed from the beginning with water as in the prior art described above, the paint remaining in the supply path b and the coating gun c is removed. However, since the remaining paint is washed together with water, there is a problem that the remaining paint is wasted. Further, if the coating pump a, the supply path b, and the coating gun c are washed at once, it takes time to completely wash the previous paint, so that it takes time to change the color and the workability is poor. was there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to improve workability by effectively using paint and shortening the color change time. .

[0007]

According to a first aspect of the present invention, there is provided a cleaning apparatus for a coating apparatus, wherein the coating is supplied to a coating gun through a supply path by a coating pump by a coating pump, and the coating is performed. The washing passage connected to the washing water supply source is connected to the pump, and the pump-side drain passage is connected to the supply passage upstream of the washing passage, so that air can be supplied from the air supply source to the washing passage. On the other hand, a first opening / closing valve is provided in the washing path, a second opening / closing valve is provided in the pump side drainage path, and a third opening / closing valve is provided in the supply path between the washing path and the pump side drainage path. It is provided.

According to a second aspect of the present invention, there is provided a method of cleaning a coating apparatus, wherein a coating pump supplies paint to a coating gun through a supply path to wash the coating apparatus for performing coating. After the cleaning is performed and the air is cleaned, the cleaning water is supplied to the coating pump side and the coating gun side by different routes to perform the cleaning.

In a third aspect of the present invention, the method for cleaning a coating apparatus is characterized in that air is mixed into the cleaning water.

[0010]

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

FIG. 1 is a piping diagram showing a configuration of a cleaning apparatus for a coating apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a paint pump, and a suction side 1a of the paint pump 1 is connected to a paint tank (not shown) for storing paint during painting. The discharge side 1b of the coating pump 1 is connected to each coating gun 3 through a supply pipe 2 as a supply path.

Specifically, the supply pipes 2 are branched on the coating gun 3 side in accordance with the number of the coating guns 3, and these branched pipes 2 a are connected via the three-way valve 4 to the respective coating guns 3. It is connected to. Each of the three-way valves 4 is also communicable with the gun-side drain pipe 5. The switching of each of the three-way valves 4 causes the paint or cleaning water supplied through the supply pipe 2 to flow through the cleaning gun 3 or the gun-side drain pipe 5. To one or both.

An intermediate portion of the supply pipe 2 is connected to one end of a washing pipe 6 serving as a washing path, the other end of which is connected to a washing water supply source 7. The washing water supplied by the washing water supply source 7 is, for example, tap water. By connecting one end of the washing pipe 6 to a faucet of the tap pipe, the washing water can be supplied by utilizing the original water pressure of the tap water. it can.

A first on-off valve 8 is provided in the washing pipe 6.
An air introduction pipe 9 connected to an air supply source 10 is connected to the other end side of the first opening / closing valve 8. As the air supply source 10, for example, a compressor is used.
To be pumped inside.

Further, one end of a pump-side drain pipe 11 serving as a pump-side drain passage is connected to an intermediate portion of the supply pipe 2 upstream of the washing pipe 6. The pump-side drain pipe 11 is for draining washing water discharged from the coating pump 1 to the supply pipe 2 to the outside during washing work with washing water to be described later. It is interposed.

A third on-off valve 13 is interposed in the supply pipe 2 between the cleaning pipe 6 connected to the supply pipe 2 and the drain pipe 11 on the pump side.

Next, a cleaning operation performed by the cleaning apparatus of the coating apparatus configured as described above will be described together with the cleaning method of the present invention.

First, when the coating is performed by the coating gun 3, the suction side of the coating pump 1 is communicated with the storage tank storing the coating material, and the third opening / closing valve 13 is opened to open the first opening / closing valve 8 and The second on-off valve 12 is closed, and the three-way valves 4 are switched so that the branch pipe 2a communicates only with the coating gun 3.

In this state, when the coating pump 1 is operated, the paint in the storage tank is supplied to each of the coating guns 3 through the supply pipe 2, and the paint is sprayed from each of the coating guns 3 to coat the object to be coated. .

Next, if it is necessary to change the color of the paint, a cleaning operation is first performed. In this cleaning operation, the paint tank and the water tank 14 are exchanged, the discharge side of the paint pump 1 is communicated with the water tank 14, the first on-off valve 8 and the second on-off valve 12 are opened, and the third Valve 13 is closed.

Then, first, air is pressure-fed from the air supply source 10 into the cleaning pipe 6, and this air is supplied to the coating gun 3 through the supply pipe 2. The supply of the air causes the paint remaining in the supply pipe 2 downstream of the cleaning pipe 6 to be sprayed from the coating gun 3, and the sprayed paint is collected in a paint tank.

Thereafter, the three-way valve 4 is switched so that the branch pipe 2a communicates with both the coating gun 3 and the gun-side drain pipe 5. In this state, the coating pump 1 is operated and the cleaning water supply source 7 supplies the cleaning water. Is supplied to the washing tube 6.

As a result, the washing water in the water tank 14 is supplied from the coating pump 1 to the upstream side of the supply pipe 2 and drained to the outside through the pump-side drain pipe 11, and the upstream of the coating pump 1 and the supply pipe 2 is washed. I do. Simultaneously with this washing, the washing water of the washing pipe 6 is jetted from the coating gun 3 through the supply pipe 2 on the downstream side, and the rest is drained through the drain pipe 5 on the gun side. Is washed.

At this time, air is supplied from an air supply source 10 into the cleaning water supplied from the cleaning pipe 6 into the supply pipe 2. Therefore, air bubbles are mixed in the cleaning water supplied from the cleaning pipe 6, and the cleaning power is enhanced by the air bubbles.

As described above, the cleaning operation is simultaneously performed on the coating pump 1 side and the coating gun 3 side at the same time, and the cleaning operation can be greatly shortened by increasing the cleaning power by the bubbles. The color change time can be shortened, and workability is greatly improved.

Further, the paint remaining before washing with the washing water is recovered by air, so that the paint can be used effectively without waste.

The above-described embodiment merely shows a preferred specific example of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope.

For example, the washing water discharged from the coating pump 1 is drained to the outside from the drain pipe 11 on the pump side.
It is also possible to connect the other end of the pump-side drain pipe 11 to the water tank 14 and circulate the washing water for washing.

The number of the coating guns 3 is not limited to four and can be set arbitrarily.

[0031]

As described above, according to the present invention, the cleaning operation can be greatly reduced by simultaneously performing the cleaning operation on the coating pump side and the coating gun side in parallel. The color change time can be shortened, and workability is greatly improved. Further, by mixing air into the cleaning water and enhancing the cleaning power by the air bubbles, the cleaning operation can be further shortened, and the workability is further improved.

Further, the paint remaining before washing with the washing water is recovered by air, so that the paint can be used effectively without waste.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a configuration of a cleaning device of a coating device of the present invention.

FIG. 2 is a piping diagram showing a configuration of a conventional cleaning device for a coating device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coating pump 2 supply pipe (supply path) 3 coating gun 6 cleaning pipe (cleaning path) 7 cleaning water supply source 8 first on-off valve 10 air supply source 11 pump-side drain pipe (pump-side drainage path) 12 second on-off valve 13 Third on-off valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) B05D 3/00 B08B 9/06 4F042 F term (reference) 3B116 AA47 AB51 BB03 BB77 BB88 3B201 AA47 AB51 BB03 BB77 BB88 BB93 BB98 CB11 4D073 AA01 BB03 CC03 CC07 DC02 DC06 DC25 4D075 AA74 BB57X BB65X 4F035 AA01 AA04 BA05 BA12 BA15 4F042 AA01 CB02 CB08 CB12 CB19 CB24 CC04 CC07

Claims (3)

[Claims] 1. A coating apparatus for supplying paint to a coating gun through a supply path by a coating pump to perform coating, wherein a cleaning path connected to a cleaning water supply source is connected to a middle part of the supply path. A pump-side drainage passage is connected to a supply passage upstream of the washing passage, and the washing passage is configured to be able to supply air from an air supply source. A cleaning device for a coating apparatus, wherein a second opening / closing valve is provided in the drainage passage, and a third opening / closing valve is provided in the supply passage between the washing passage and the pump-side drainage passage. 2. A cleaning method for supplying a coating material to a coating gun through a supply path by a coating pump to wash a coating apparatus for performing coating. A cleaning method for a coating apparatus, characterized in that cleaning water is supplied by supplying cleaning water to the paint gun and a separate path to perform cleaning. 3. The method according to claim 2, wherein air is mixed into the cleaning water.