JPH0441182Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is used for coating, for example, for pre-treatment cleaning of electrodeposition coating and for removing residual paint etc. adhering to the surface of the object to be coated after completion of electrodeposition coating. Regarding water washing equipment.

[Conventional technology]

For example, the washing equipment used for electrodeposition coating requires a large amount of washing water, but since the washing water used to wash the object to be coated is not very contaminated, it is circulated after being filtered. I am planning to do so.

FIG. 5 is a flow sheet showing such a conventional water washing device, in which washing water stored in a washing water tank 30 is force-fed through a water pipe 32 by a pump 31 and inserted into the water pipe 32. After paint scum and the like contained in the cleaning water are removed by the filter 33 and sprayed onto the object T from the shower nozzles 36, 36 attached to the riser pipe 35 of the cleaning chamber 34, the cleaning water is returned to the cleaning water tank 30. It is designed to be collected and recycled.

[The problem that the idea attempts to solve]

However, in the conventional water washing device, the filter 33 that filters the washing water is directly interposed in the water pipe 32, so if the filter 33 becomes clogged with paint scum, etc. contained in the circulating washing water, Shower nozzle 3 of riser pipe 35
There is a problem in that the pressure of the cleaning water sprayed from 6, 36, etc. decreases, making it impossible to sufficiently clean the object T to be coated, making it impossible to obtain good coating quality.

In addition, since the filter 33 is directly installed in the water pipe 32, the filter 33 that has become clogged
When replacing the pump, the pump 31 must be stopped each time.

Therefore, when replacing the filter 33, the pump 31 is stopped and the cleaning water is not circulated, making it impossible to clean the object T. Therefore, the clogging of the filter 33 is discovered while the painting line is in operation. If this happens, the painting line must be stopped.

Note that if a cage-shaped filter made of wire mesh or the like is installed on the washing water tank 30 and the washing water is filtered by pouring it into this filter (see Utility Model Application Publication No. 62-31964), the filter becomes visible. Even if a blockage occurs, the shower nozzle 3 can be removed from the wash water tank 30.
There is no need for a high load to be applied to the pump 31 that supplies wash water to the pump 6.

However, if the cleaning water is continued to circulate without noticing the clogging, the cleaning water will not be filtered at all and will continue to circulate containing paint gas, making it impossible to clean the object to be coated. There's a problem.

Therefore, the present invention is capable of detecting that the filter is clogged and stopping the pump without putting unnecessary load on the pump and causing cleaning failure even if the filter is clogged. The objective is to make it possible to replace the filter without any hassle.

[Means to solve the problem]

In order to solve this problem, the present invention has been proposed in a painting water washing device in which the washing water from the washing tank is circulated and supplied to the shower nozzle etc. using a pressure pump, and the water is collected in the tank at the top of the washing water tank. A filtration device is provided, which has a filtration tank into which wash water is poured, and a drain port into which the wash water overflowing from the filtration tank is directly poured into the wash water tank. A recovery port that is open to the atmosphere is formed to drop the water into the washing water tank, and a baggage filter for filtering the washing water is removably attached to the collection port. It is characterized by being equipped with a liquid level sensor that detects clogging.

[Effect]

According to the present invention, a filtration tank is formed at the top of the washing water tank, and a bag filter for filtering the washing water is attached to a collection port opened to the atmosphere at the bottom of the filtration tank, so that the water is circulated and refluxed. Since the flushing water is once released into the atmosphere and then poured into the bag filter, even if the bag filter becomes clogged, the pressure of the flushing water pumped to the shower nozzle will not fluctuate.

When the bag filter becomes clogged, cleaning water accumulates in the filtration tank, its water level rises, and eventually overflows from the filtration tank and is poured into the cleaning water tank through the drain port.

At this time, when the water level exceeds a certain value, a detection signal is output from the liquid level sensor, and clogging of the bag filter is detected.

In addition, since the filter tank is formed above the wash water tank, even if the bag filter is removed for replacement, the wash water will be poured directly into the wash water tank from the collection port, making it impossible to stop the pressure pump. The filter can be replaced even when the painting line is in operation.

〔Example〕

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a flow sheet showing a water washing device according to the present invention, FIG. 2 is a plan view showing the main parts thereof, FIG. 3 is a sectional view thereof, and FIG. 4 is a side view thereof.

In the figure, reference numeral 1 denotes a cleaning chamber for cleaning the surface of an object to be coated T immersed in an electrocoating paint tank (not shown), and shower nozzles 2, 2... A riser pipe 3 is provided, and washing water from a washing water tank 4 is supplied to the riser pipe 3 via a water pipe 6 by a pressure pump 5, and the washing water is applied to the object to be coated at a predetermined pressure. A collection pipe 7 is connected to the lower part of the cleaning chamber 1 to collect the cleaning water sprayed from the shower nozzles 2, 2, . . . and return it to the cleaning water tank 4.

In addition, the water pipe 6 is branched in the middle, and for example, about 1/5 of the cleaning water sent under pressure to the riser pipe 3 is transferred to the water pipe 6.
The water is returned to the wash water tank 4 through a bypass pipe 8 branched from the wash water tank 4.

9 is a filtration device for filtering the wash water returned from the bypass pipe 8 to the wash water tank 4,
A filter tank 10 formed above the wash water tank 4
and a bug filter 12 that is detachably attached to a recovery port 11 that is open to the atmosphere and is formed at the bottom of the filtration tank 10, and is discharged from the bypass pipe 8 that is opened at the side of the filtration tank 10. After the cleaning water is once released into the atmosphere, it is dropped into the bag filter 12 and filtered by the gravity of the cleaning water, and the filtrate is dripped from the cleaning water tank 4, and paint scum and the like contained in the cleaning liquid are removed from the bag filter 12. Captured by 12.

The bag filter 12 is formed into a bag shape with a filter cloth made of polypropylene mesh woven at intervals of 100 μm, for example, and is attached to a filter support 13 with its opening 12a facing upward and enters the washing water tank 4 from the collection port 11. It is hanging down.

The filter support 13 includes a cylindrical base 13a that fixes the opening 12a of the bag filter 12, and a flange portion 13b formed on the outer periphery of the base 13a.
and a handle 13c welded to the flange portion 13b.
and a wire mesh guard 13d that prevents the bag filter 12 from falling off.
b is engaged with the edge of the collection port 11 so that the bag filter 12 can be detachably attached to the collection port 11.

In addition, 14 is a shower nozzle that sprays water when the circulation of cleaning water is stopped to prevent the paint components from solidifying due to drying of the bag filter 12, and 15 detects the position of the cleaning water level in the filter tank 10. A liquid level sensor 16 detects clogging of the bag filter 12, a drain port 16 collects overflowing wash water to the wash water tank 4 when the bag filter 12 is clogged, and 17 detects dirt, etc. in the filter tank 10. This is a lid that prevents water from entering.

The above is an example of the configuration of the present invention, and its operation will be explained next.

First, when the coating line is put into operation, the object to be coated T immersed in an electrocoating paint tank (not shown) is transported to the cleaning chamber 1, and the pressure pump 5 pumps the cleaning water from the cleaning water tank 4 into the water pipe 6. The cleaning water is supplied to the riser pipe 3 from the shower nozzle 2 and sprayed onto the object T at a predetermined pressure, and the cleaning water that has washed the object T is returned to the cleaning water tank 4 via the recovery pipe 7. It is again fed to the riser pipe 3 by the pressure pump 5 and used for circulation.

On the other hand, about 1/5 of the washing water sent to the riser pipe 3 out of the washing water sent by the pressure pump 5.
Washing water with a flow rate of
2 and is filtered, and the filtrate is dropped and collected in the wash water tank 4.

That is, the cleaning water filtered by the filtering device 9 does not pass through the bag filter 12 due to the feeding pressure of the pressure pump 5, but the cleaning water is dropped into the cleaning water tank 4 from the collection port 11 of the filtration tank 10. It passes through the bag filter 12 and is filtered by gravity.

If the bag filter 12 becomes clogged with paint scum and the like contained in the cleaning water collected from the cleaning chamber 1, the filtration efficiency of the bag filter 12 will decrease.
is not directly installed in the bypass pipe 8, but is attached to the recovery port 11 which is open to the atmosphere and is formed on the bottom of the filtration tank 10, so that the cleaning water that has passed through the bypass pipe 8 is once removed. Even if the bag filter 12 becomes clogged, there will be no change in the load on the pressure pump 5, and therefore the water is emitted from the shower nozzle 2 attached to the riser pipe 3 of the cleaning chamber 1. The pressure of the washing water used is always maintained constant and there is no possibility of poor washing.

In addition, even if the baggage filter 12 becomes completely clogged, the wash water overflowing from the baggage filter 12 will be collected from the drain port 16 into the wash water tank 4 without overflowing to the outside, and will be used for showering. As mentioned above, the pressure of the cleaning water injected from the nozzle 2 is not affected.

At this time, when the water level exceeds a certain value, a detection signal is output from the liquid level sensor, and, for example, an alarm lamp is lit by an alarm device, and at the same time an alarm sound is emitted to notify that the bag filter is clogged.

Here, to replace the bug filter 12,
First, the clogged bag filter 12 can be easily removed from the collection port 11 by opening the lid 17 of the filter tank 10 and lifting it by holding the handle 13c of the filter support 13.

Then, when the filter support 13 to which the new bag filter 12 is attached is inserted into the collection port 11 from inside the filtration tank 10, the flange portion 13b is locked to the edge of the collection port 11, and the installation of the bag filter 12 is completed. When the lid body 17 is closed, the replacement work of the bag filter 12 is completed.

During this time, the cleaning water flowing into the filter tank 10 from the bypass pipe 8 is collected directly into the cleaning water tank 4 without passing through the filter 12, so the painting line can be stopped without stopping the pressure pump 5. Even during the replacement work, the shower nozzle 2 in the cleaning room 1 can be
There is no fluctuation in the pressure of the cleaning water sprayed from the

As described above, according to the present invention, the recovery port 11 that is open to the atmosphere is formed in the upper part of the wash water tank 4, and the wash water that has passed through the bypass pipe 8 is once released into the atmosphere before being collected. Since the filter is filtered by the bag filter 12 attached to the port 11, the pressure of the pressure pump 5 does not change depending on the degree of clogging of the bag filter 12, and the pressure is always constant from the shower nozzle 2. The bag filter 12 is removably attached to the collection port 11 formed in the upper part of the wash water tank 4, so even if the filter 12 becomes clogged, the water can be pumped out. It is possible to easily replace the pump 5 while it is still in operation.

Furthermore, since a filter is not directly interposed in the water pipe 6, the load on the pressure pump 5 is extremely small, and the power consumption required to operate the pressure pump 5 is also small, so running costs can be reduced. can.

In addition, in the description of the embodiment, a case has been described in which the wash water that is returned through the bypass pipe 8 branched from the water pipe 6 is made to flow into the filter tank 9, but the present invention is not limited to this. For example, the cleaning chamber 1 and the cleaning water tank 4 may be arranged one above the other, and the cleaning water collected from the cleaning chamber 1 may be filtered by flowing into the filtration tank 10.

Further, the size and material of the mesh of the bag filter 12 can be arbitrarily selected.

Furthermore, in the above embodiment, the case where the device is used as a washing device after the completion of electrodeposition coating was explained.
Of course, the present invention is not limited to this, and can be used as a water washing device for pre-treatment of other coatings.

Furthermore, the collection port 11 that is open to the atmosphere as used in the present invention is not limited to the case where the collection port 11 is completely opened to the atmosphere, but also includes the case where the collection port 11 is closed by the lid 17 as in the embodiment.
Of course, this also includes cases where the area is covered.

The filtration device 9 used in the present invention is installed above the paint replacement tank in an electrocoating device, and is used in place of a conventional filtration device that may clog the filter if it is not used for a long period of time. It is also very effective.

[Effect of idea]

As described above, according to the present invention, it is possible to always supply cleaning water at a constant pressure regardless of the degree of clogging of the bag filter, and to reliably clean the object to be coated. It is possible to reliably detect that the filter has become clogged based on the detection signal of the liquid level sensor installed in the tank.Furthermore, even if the filter is removed, the cleaning water can be collected into the cleaning tank through the collection port. Therefore, it has a very excellent effect that the filter can be easily replaced without stopping the pump.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet showing a water washing device for painting according to the present invention, Fig. 2 is a plan view showing the main parts thereof, Fig. 3 is a cross-sectional view thereof, and Fig. 4 is a side view thereof.
FIG. 5 is a flow sheet showing a conventional water washing device for painting. Explanation of symbols, 1...Cleaning chamber, 2...Shower nozzle, 3...Riser pipe, 4...Cleaning water tank,
5... Pressure pump, 6... Water pipe, 7... Recovery pipe, 8... Bypass pipe, 9... Filtration device, 10...
...filtration tank, 11 ... collection port, 12 ... baggage filter, 13 ... filter support.

Claims (1)

[Scope of utility model registration request] In a painting water washing device configured to circulate and supply washing water from a washing tank 4 to a shower nozzle 2 etc. by a pressure pump 5, a filtration tank is provided in the upper part of the washing water tank 4 into which the washing water to be collected is poured into the tank 4. 10 and a drain port 16 through which the overflowing wash water from the filtration tank 10 is directly poured into the wash water tank 4. At the bottom of the filtration tank 10, the wash water in the filtration tank 10 is disposed. A collection port 11 that is open to the atmosphere is formed to drop the water into the washing water tank 4. A bag filter 12 for filtering the washing water is removably attached to the collection port 11, and the water level of the washing water in the filtration tank 10 is A water washing device for painting, characterized in that it is provided with a liquid level sensor 15 that detects clogging of the bag filter 12 based on the above.