JPS5930149B2 - Paint transport piping cleaning method - Google Patents

Description

[Detailed Description of the Invention] <Technical Classification/Field> The disclosed technology belongs to the technical field of removing paint slag and rust adhering to pipes that transport paint to a coating device using a cleaning fluid.

<Explanation of the gist> Therefore, this invention stops the paint transport to the paint transport pipe extending from the paint tank to the painting equipment in the paint plant installed in the automobile factory, etc., and This invention relates to a method for cleaning paint transport piping, in which paint residue, rust, etc. attached to the pipe are removed by pumping a cleaning fluid, and then dried with dry air. Paint residue, rust, etc. are completely removed by impact force, and at the end of the process, the presence or absence of residue discharge is checked. Dry air is then forced out to dry the inside of the pipe, residual dust is removed, and the presence of steam or mist is checked. This invention relates to a method for cleaning paint transport piping that is checked.

<Prior art> As is well known, there is a painting line in an automobile manufacturing factory, etc., and a painting plant installed in the line is connected to a separate paint source tank by a paint transport pipe, and ,
Even within the plant, branch piping for each gun is provided in a bent manner.

Therefore, paint tends to adhere to the inside of these paint transport pipes over time, and residues tend to adhere to the inside of these paint transport pipes over time, and rust is also likely to occur, and if left unattended, the flow rate will decrease. Decrease or
This can lead to pipe damage, so it is necessary to clean the inside of the pipe periodically or irregularly. <Problems with conventional technology> Therefore, in general, organic solvents such as thinner are passed through the pipe to remove the adhesion, except in the case of water-based paint delivery, but paint transport pipes generally have a large diameter. Many of the pipes are thin tubes of 1 inch or less, and as mentioned above, there are many branches and bends, making it difficult to achieve a sufficient cleaning effect. It also has the disadvantage of being contaminated with rust, leading to poor accuracy such as so-called paint fluorescing in the product5, and also has the disadvantage of being expensive because it requires cleaning over a long period of time using a large amount of solvent. Ta.

OBJECT OF THE INVENTION The purpose of the present invention is to solve the technical problem of cleaning the paint transport piping based on the above-mentioned prior art, and to completely discharge the previous coating residue from the paint transport pipe after the painting cycle. The purpose of the present invention is to provide an excellent method for cleaning paint transport piping, which is beneficial to the field of application of painting technology in the manufacturing industry, by cleaning, drying, and confirming the cleaning to ensure that the next painting can be performed accurately.

In order to solve the above-mentioned problems, the structure of the present invention, which is in accordance with the above-mentioned object and whose gist is the scope of the above-mentioned patent claims, is to solve the above-mentioned problem by providing a method in which 501 High-pressure water is pumped as a cleaning fluid, and the impact force due to its dynamic pressure,
Peels off and removes stuck paint and rust using mechanical stress,
Then, at the end of draining, check whether it has been completely drained or not, and then dry 3kg/CT? 1. The present invention aims to provide an excellent method for cleaning paint transport pipes in which the above compressed air is forced to flow through the pipes to push out residual water in the pipes, check for complete drying, and thus drain and dry the pipes to remove dust. It is something.

Embodiment Next, one embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a paint transport pipe, which is installed in a painting line of an automobile paint factory, and is shown in a U-shaped tube configuration for convenience of illustration. It is connected to the tank via an appropriate joint.

The cleaning pipe 4 is inserted into the base 3 via a flange joint during cleaning, and is appropriately equipped with a valve 5 and a pressure regulating valve 6 with a pressure gauge in series. Therefore, the first
In the illustrated embodiment, the cleaning pipe 4 is connected to the paint transport pipe 1.

In addition, 7 is a water tank for cleaning, and 8 is a high-pressure pump, which is connected to the water tank 7 via a water suction pipe 10 having a strainer 9 at the tip, and can also be connected to the cleaning pipe 4. The cleaning water A is supplied by Further, in the embodiment shown in FIG. 2, 11 is a compressed air pump, which has a dehumidifier 12 at the rear and a filter 13 at the front, and is connected to the cleaning pipe 4. ing.

Further, 14 is a confirmation wire mesh, which is used at the tip in the embodiment shown in Fig. 1, and 15 is a detection lamp, 16 in the embodiment shown in Fig. 2.
is the filter paper of the detection paper.

In the cleaning device described above, after the paint is transported to a predetermined position by the paint transport pipe 1 and used for painting, the paint pressure system (not shown) of the base 3 is removed when cleaning the inside of the pipe, and in the embodiment shown in FIG. Similarly, the cleaning pipe 4 of the unit is connected to the paint transport pipe 1, the pressure pump 8 is further connected, and the strainer 9 is connected to the water tank 7. Further, the tip of the paint transport pipe 1 is opened and connected to a drainage system as appropriate.

Then, the high-pressure water pump 8 is operated, and the cleaning water A is pumped using the pressure regulating valve 6 at a set pressure of 50 kg/d or more while monitoring the pressure gauge.

Therefore, the high-pressure cleaning water A is applied to the inside of the paint transport piping 1, regardless of whether it is a straight pipe, a bent part, or a branched part, and the paint adhered to the inner wall of the pipe due to the impact force caused by the dynamic pressure, mechanical stress, etc. Residues, rust, etc. are peeled off and removed.

In this case, the flaking is removed more effectively by pulsating the pressure of the pressure regulating valve 6 high and low within the permissible range. By force-feeding sand and the like together with high-pressure water, the impact action is promoted and the cleaning effect is increased.

Further, by superimposing these actions, the cleaning effect is further increased.

Then, at the end of the cleaning process, as shown in Figure 1, the confirmation wire mesh 14 of the predetermined mesh is placed against the tip discharge port 2 to check whether paint residue or rust residue is discharged during the drainage. After confirming that no water is being discharged, the pressure pump 8 is stopped, and the pressure pump 8 is removed together with the cleaning pipe 4.

Next, as shown in FIG. 2, a dehumidifier 12 is installed at the rear end of the pressure regulating valve 6.
, connect the compressed air pump 11 equipped with the filter 13, and adjust the pressure regulating valve 6 while watching the pressure gauge to obtain 13 kg/C1.
? Dry air B is force-fed at a set pressure of L or higher.

Therefore, after the inside of the paint transport pipe 1 is washed with water, it is immediately dried with dry air B, and the residual moisture inside the pipe is discharged, and the adhering residual dust is discharged by the air blowing action.

In this drying process, pulsating the air pressure leads to effective cleaning and drying.

At the end of the drying period, the sight lamp 15 is turned on to visually detect the presence of discharged steam, or the detection filter paper 16 is used to detect the presence of discharged steam. When the mist disappears, the compressed air pump 11 is stopped and removed, and the paint feeding device (not shown) is removed. connection again and resume paint transport.

Therefore, it is possible to prepare for the next painting in a completely washed and dried state.

In the above embodiment, the set pressure of high-pressure cleaning water A and the set pressure of compressed drying air B are determined by considering the diameter, length, material, wall thickness, route, period of use, paint used, etc. of the paint transport pipe 1. Decide accordingly.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments; for example, the water and air for cleaning may be pumped in a spiral manner, air bubbles may be mixed into the water, etc. The following aspects can be adopted.

In addition, as shown in Figure 3, if the horizontal axis w represents the period after reuse (time elapsed) and the vertical axis represents the number of paint splatters per vehicle, the conventional data graph C1 In comparison, it can be seen that the data graph C2 obtained by the method of the present invention has a remarkable effect.

<Effects of the Invention> As described above, according to the present invention, in a method for cleaning the inside of paint transport piping installed in a painting line of an automobile factory, etc., high pressure water is initially pumped as cleaning water, so that the dynamic pressure causes physical damage. It has the effect of being able to physically and mechanically peel off and remove paint residue and rust adhering to walls.

Therefore, the impact peeling force can remove these adhering paint residues and rust, so when refeeding the paint, there is no mixing of paint sludge into the paint, which has the excellent effect of improving product precision. There is also.

In addition, since water is used for cleaning, it not only has the advantage of being less expensive than solvents, etc., but also makes it easier to drain the water after cleaning, and its treatment is easier than using solvents.
It also has the advantage of lower processing costs. Furthermore, by force-feeding dry air after washing with washing water, residual water from washing inside the pipe can be discharged and the pipe can be immediately prepared for reuse, and dust etc. can be discharged, making the cleaning effect even more effective. It has a promoting effect.

By adopting such a cleaning process, the cleaning time, including the work time and lead time, can be significantly shortened, and the effect on the line can be reduced.

Therefore, at the end of water cleaning, a mesh or the like is used to check whether there is any paint residue or rust left, which has the excellent effect of ensuring complete cleaning.

Furthermore, by checking for the presence of steam or mist even at the end of air drying, there is an excellent effect of reducing the risk of deterioration or dilution of the next paint.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of one embodiment of the present invention, and FIGS. 1 and 2 are schematic side views illustrating the cleaning process, and FIG. 3 is a graph diagram illustrating data on the number of occurrences of paint fluoride. 1...Transport piping, A, B...Cleaning fluid, A...゜...Washing water, B...Dry air.

Claims (1)

[Claims] 1. In a paint transport pipe cleaning method in which cleaning fluid is forced to flow through the paint transport pipe while paint transport is stopped to remove residual paint scum inside the pipe, and then dry air is supplied and discharged, the cleaning water is first High-pressure water is forced through the pipes to peel off and eliminate paint slag adhering to the inside of the pipes.Finally, the drain is checked to ensure that no slag is discharged, and then compressed air is forced through the pipes to push out the remaining water inside the pipes. A method for cleaning paint transport piping, characterized in that it is dried and, finally, the presence or absence of discharged steam mist is checked while air is being discharged.