JPS6025520B2 - Processing method and device for cationic electrodeposition washing liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for treating a cationic electrodeposition washing liquid in a cationic electrodeposition coating method, and in particular, by replacing main parts such as a washing tank with a washing liquid containing less paint. The present invention relates to a method and apparatus for processing a cationic electrodeposited rinsing liquid that saves energy by preventing the rinsing liquid from solidifying even when the main parts are stopped during holidays.

The cationic electrodeposition coating method is used for undercoating objects to be painted, such as automobiles, and is a method in which the object to be painted is used as a negative electrode and the paint as a positive electrode. It has been widely used in recent years due to its advantages such as excellent durability, etc. However, on the other hand, it is necessary to remove physically attached paint other than electrically attached paint to the object to be coated by washing with water. In the example, a riser that injects a washing liquid onto a workpiece coated with a mist coating, a washing chamber that receives the washing liquid sprayed from the riser and dropped, and a washing chamber that collects and stores the washing liquid from the washing chamber. a tank, a haze deposition tank in which the object to be coated is transported and subjected to dry coating; a separation device that separates the desorption paint sent from the desorption tank into paint and a washing liquid; A device equipped with a washer liquid tank that stores the separated washing liquid and sends it to the washing tank has been used.

However, in this conventional example, the washing operation ends with the washing liquid containing a considerable amount of paint remaining in the main parts such as the washing tank, so if the recovered paint in the washing liquid is not constantly cleaned, it becomes a paint. Since the water settles and solidifies, it is necessary to run the washing liquid into the washing tank even during holidays to simulate the water, which requires a lot of power, especially during long holidays. If this were the case, it would have resulted in large losses.

The present invention has been made in order to eliminate the drawbacks of the conventional techniques described above, and its purpose is to separate the water washing tank, transfer tank, and tortoise-based paint from the paint and water in the cationic electrodeposition coating method. By cleaning the inside of the separation device that separates the liquid from the liquid and replacing it with the washing liquid that contains less paint, it is possible to eliminate the need to drain the washing liquid in main parts such as the washing tank during holidays. Significantly reduces power consumption,
The aim is to save energy. Another purpose is to prevent clogging and other malfunctions in piping by preventing the solidification of recovered paint in main parts such as the water washing tank, and to ensure smooth operation after holidays. Still another objective is to reduce this damage and to reduce factory noise by shutting down the flushing liquid light stem pumps and motors during the holiday period. In short, the method of the present invention includes a riser that injects a washing liquid onto a workpiece that has been electrodeposited, a washing chamber that receives the washing liquid sprayed from the riser and dropped, and a collection and storage area for collecting and storing the washing liquid from the washing chamber. a washing tank in which the object to be coated is transported and subjected to lightning coating; a separation device that separates the haze paint sent from the lightning coating tank into paint and a washing liquid; and a washer liquid tank configured to store the washing liquid separated by the device and send it to the washing tank, wherein the backwash circuit of the separation device is turned on after the riser finishes washing the object to be coated. The washing liquid in the thin liquid tank is sent to the separation device to clean the inside of the separation device, and each piping and the inside of the separation device are replaced with the washing liquid, the separation device is stopped, and the inside of the washing tank is The washing liquid is returned to the electrodeposition overflow tank provided adjacent to the electrodeposition tank using a pump to empty the washing tank, and then the washing liquid from the ash liquid tank is pumped into the empty washing tank. and condensing the washing liquid in the washing tank, sending the washing liquid to the riser to clean the riser and the washing chamber, and returning the washing liquid in the washing tank to the electrodeposition overflow tank again with a pump. The washing tank is emptied, the circuit leading to the riser is put into normal operation, and the separator is then operated to pump the deposited paint in the electrodeposition overflow tank to the separator to separate the paint and washing liquid. The water is separated and the washing liquid is returned to the washer liquid tank, the monkey liquid tank is overflowed and sent to the washing tank, the washing tank and the washer liquid tank are filled with the washing liquid with a low paint content, and then the washing liquid is poured again. Sending the washing liquid in the monkey liquid tank to the separation device using a pump to clean the inside of the separation device, and replacing each piping and the inside of the separation device with the washing liquid,
The present invention is characterized in that the flow of the washing liquid in the separation device, the washing tank, and the monkey liquid tank is stopped during holidays.

The apparatus of the present invention also includes a riser configured to spray a washing liquid onto a workpiece coated with a mist coating, and a riser disposed below the riser to receive the washing liquid sprayed and dripped from the riser. a washing chamber, a washing tank connected to the washing chamber and configured to collect and store the washing liquid from the washing chamber, and a washing tank disposed in a pre-process of the riser, in which the object to be coated is immersed and transported for electrodeposition coating. a separation device connected to the dew tank and configured to separate military paint sent from the haze tank into paint and a washing liquid;
and a mustard liquid tank connected to the separator to store the washing liquid separated by the separator and connected to the washing tank to send the washing liquid to the washing tank. An electrodeposition overflow tank is provided adjacent to the deposition tank, and the bottom of the haze overflow tank is connected to the bottom of the electrodeposition tank via a pump and piping to form a constantly operating section, and the A pipe is connected to the dew paint inlet of the separation device by another pipe via a valve and a pump, and the pipe is branched to pass through the upper part of the electrodeposition overflow tank by another pipe, and the separation device The paint outlet is further passed through another pipe to the upper part of the electrodeposition overflow tank, and the washing liquid outlet of the separator is conveyed to the upper part of the ash liquid tank by the pipe via a valve, The piping is branched and connected to the bottom of the monkey fluid tank by another piping via a valve and a pump, and the piping is further branched and connected to the top of the washing tank by another piping via a valve. The bottom of the washing tank is connected to the inside of the washing tank and to the riser by piping via a pump and a valve, and a passage is passed through the top of the electrodeposition overflow tank, so that the top of the liquid solution tank and the bottom of the washing tank are connected to each other. It is characterized by having a lotus thread between the upper part and the upper part.

The present invention will be explained below based on embodiments shown in the drawings.

In FIG. 1, a treatment device 1 for cationic electrodeposition washing liquid includes:
A riser 3 for the 0th wash, a riser 4 for the 1st wash, and a 2nd riser for spraying the washing liquid 2 onto the workpiece (not shown) that has been decoated.
A riser 5 for secondary flushing and a riser 6 for tertiary flushing, a flushing chamber 7 that receives the flushing liquid 2 sprayed and dropped from the risers 4, 5, and 6, and a second flushing chamber 7 that collects and stores the flushing liquid 2 from the flushing chamber. 1 washing tank 8, 2nd washing tank 9 and 3rd washing tank
A washing tank 10, a coating tank 11 in which the object to be coated is immersed and exposed for coating, a separation device 12 for separating the electrodeposition paint sent from the electrodeposition tank into paint and a washing liquid, and the separation The washing liquid 2 separated by the device is stored in washing tanks 8, 9,
It is equipped with a oak liquid tank 13 configured to send 101 times a day. The riser 3 for 0th flush has a valve 14 and an auto valve 1.
5, a strainer S, and a pump P3, and are connected to the first water washing tank 8 by a pipe 16.

The primary flush riser 4 is connected by a pipe 17 between the valve 14 of the pipe 16 and the autovalve 15. The second flush riser 5 is connected to the second flush tank 9 by a pipe 19 via an autovalve 18, a strainer S2, and a pump P4. The third flushing riser 6 is connected to the third flushing tank 10 by a pipe 21 via an autovalve 20, a strainer S3, and a pump P5. One end of a U-shaped pipe 22, 23, 24, which is an example of piping for extinguishing washing foam, is connected to the bottom 7a of the washing chamber 7, and the other end is connected to an upper part than the bottom 7a. There is. The U-shaped pipe 22 is connected to the first flushing tank 8 through a valve 25, the U-shaped pipe 23 is connected to the second flushing tank 9 through a valve 26, and the U-shaped pipe 24 is connected to the third flushing tank o' through a valve 27. There is a communication support line between each of them. The pipe 28 branches from the pipe 16 and opens into the first washing tank 8 via a valve 29, and the pipe 28 branches from the pipe 19 and opens into the second washing tank 9 via a valve 31. The piping 32 branches from the piping 21 and opens into the third flush tank 10 via a valve 33.

These pipes 28, 30, 32 are connected to the washing tank 8 during washing.
, 9 and 10 to prevent the paint from settling. The haze deposition tank 11 has a sufficient depth for the object to be coated to be immersed and conveyed, and contains a paint 34, and a haze overflow tank 35 is provided adjacent to the desorption tank. . The haze overflow tank 35 is connected to a pump P.
? , pipe 36 via strainer S4 and filter F2
It is connected to the haze tank 11 through a lotus connection, and is also connected to the separation device 12 through a pipe 38 via an auto valve 61, a supply pump P, a filter F, a pressurization pump P2, and an auto valve 37. has been done. In the separation device 12, a plurality of ultrafiltration tubes (hereinafter referred to as UF tubes) 12a are connected to pipes 38, 39, and 40, respectively, and the pipe 38 is connected to the electrodeposited paint inlet, and the pipe 39 is connected to the paint outlet. In addition, the pipes 40 are respectively connected to the washing liquid outflow portions. In addition, the pipe 39 is connected to the dew overflow tank 3.
5, one end 41a faces the upper part 35a of the filter F.
, and the pump P2, and the pipe 40 is connected to the oak liquid tank 13 via an auto valve 42.
It closes facing the upper part 13a of the. Further, a pipe 43 branches off from the middle of the pipe 40, and the pipe 43 is connected to the lower part 13b of the oak liquid tank 13 via an autovalve 44 and a pump P6. Further, a pipe 45 branches off from the pipe 43, and this pipe is connected to a pipe 47 via an autovalve 46, and the pipe 47 connects a valve 49 to the upper part 8a of the first flush tank 8 via a valve 48. It opens to the upper part 9a of the second water washing tank 9 through the valve 50, and to the upper part 10a of the third water washing tank 10 through the valve 50. Further, a pipe 51 branched from the pipe 16 has a valve 52.
A pipe 53 branched from the pipe 19 is connected to the pipe 51 via a valve 54, and a pipe 55 branched from the pipe 21 is connected to the pipe 51 via a valve 56. 51.
Further, the upper part 13a of the monkey liquid tank 13 is connected to the upper part 10a of the third washing tank 10 through a pipe 561, and the upper part 10a of the third washing tank 10 is connected to the upper part 9a of the second washing tank 9 through a pipe 57. The upper part 9a of the second washing tank 9 and the upper part 8a of the first washing tank 8 communicate with each other.

Note that the part surrounded by the broken line is a constantly operating section 58 that is operated even during holidays. The present invention is configured as described above, and its operation will be explained below.

First, a case will be described in which the object to be coated is electrodeposited in the lightning tank 11 and washed with water in the risers 3, 4, 5, and 6.

In this case, automatic operation is performed, and the valves 61, 37,
42, 25, 26, 27, 29, 31, 33, 14, 1
5, 18, 20, 48, 49, and 50 are open, and valves 44, 46, 52, 54, 55, and 56 are closed. When the pumps P7, P, P2 are operated, the military paint 59 in the electrodeposited overflow 35 is sent to the UF tube 12a of the separation device 12 while passing through the strainer S4 and the filters F2, F, and being sieved. Here, the paint and the washing liquid are separated, and the paint is returned to the overflow tank 35 through the pipes 39 and 41, and a portion is returned from the pipe 41 to the pipe 38, and is again applied to the separation device 12. On the other hand, the separated washing liquid 2 passes through the pipe 40 and flows into the monkey liquid tank 13 from the upper part 13a through the auto valve 42 and is stored therein, and the third washing tank 10 is replenished with the washing liquid 2 from the monkey liquid tank. The water overflows through the pipe 60 and is replenished, and similarly, the washing liquid 2 in the first and second washing tanks 8 and 9 flows through the pipe 5.
7, the washing liquid 2 in the third washing tank 10 overflows and is sent in, and the liquid level of the washing liquid 2 in the first washing tank 8 is detected by a bell meter (not shown) and the auto valve is activated. At 52, the amount of washing liquid 2 in each of the washing tanks 8, 9, and 10 is controlled to be maintained at a constant amount. The washing liquid 2 in the first washing tank 8 is sprayed from the first washing riser 4 through the strainer S and the piping 16 by the pump P3, through the zero washing riser 3 and the branched pipe 17, and is sprayed from the first washing riser 4 to be coated. wash things; The washing liquid 2 dropped by washing in the riser 3 for 0th washing is directly returned to the atomization overflow tank 35, and the washing liquid 2 dropped by washing in the riser 4 for primary washing is sent from the bottom 7a of the washing chamber 7 to the U. After entering the U-shaped tube 22, the flushing foam ascends and circulates within the U-shaped tube 22 again, and only the flushing liquid 2 is returned to the first flushing tank 8, and the flushing foam disappears.

During cleaning, the washing liquid 2 that has entered the pipe 28 is
8 and sprays the washing liquid 2 in the washing tank 8,
Prevents paint from settling and solidifying. Pump as well?
The washing liquid 2 in the second washing tank 9, which is sent through the strainer S2 and the piping 19, is injected from the secondary washing riser 5 and drips, and is returned to the washing tank 9 from the U-shaped pipe 23, and then passed through the piping 30. A part of the water is sprayed from the water and the washing liquid 2 is sprayed.

Similarly, the pipe 21 and the strainer S are connected by the pump P5.
The washing liquid 2 in the third washing tank 10 that is sent through the third washing tank 10 is injected from the third washing riser 6 and drips down into the U-shaped pipe 2.
4 is returned to the flushing tank 10, and a portion is injected from the piping 32 to feed the flushing fluid 2. The above is the normal water washing work that is repeated by automatic operation. Next, a method for processing the washing liquid 2 during the holiday period, which is a feature of the present invention, will be explained.

First, pumps P3, P4, and P5 are stopped, and each riser 3,
The injection of the washing liquid 2 from 4, 5, and 6 is stopped, and the washing is stopped. When the water washing tanks 8, 9, and 10 are empty,
The valves 37, 42, and 46 are closed to form a backwash circuit so that the washing liquid 2 flows back from the monkey fluid tank 13 to the separation device 12.

That is, by operating the pump P6, the washing liquid 2 in the moat liquid tank 13 is sent to each UF tube 12a of the separation device 12 through the piping 43, the valve 44, and the piping 40, and the inside of the UF tube is filled with the washing liquid 2 containing less paint. After cleaning and replacing, those with a large paint content are transferred to the electrodeposition overflow tank 3 via pipes 39 and 41.
I can go back to 5. Next, valves 15, 18, 20, 29, 31
, 33 are closed, the valve 56 is opened, and the pump P5 is operated, the washing liquid 2 in the third washing tank 10 flows through the strainer S3 and the piping 21, through the valve 56, the piping 55, and the piping 51, and the It is returned to the overflow tank 35,
All of the washing liquid 2 in the third washing tank 10 is removed,
The washing tank 10 is emptied and the pump P5 is stopped.
Next, when valve 54 is opened and pump P4 is activated,
The washing liquid 2 in the second washing tank 9 passes through the strainer S2 and the pipe 19, passes through the valve 54, the pipe 53, and the pipe 51, and is returned to the clothing overflow tank 35. 2 are all removed, the washing tank 9 is emptied, and the pump P4 is stopped.

Next, when the auto valve 52 is opened in the same way and the pump P3 is activated, the washing liquid 2 in the first washing tank 8 flows through the strainer S and the piping 16, then through the auto valve 52 and the piping 51, and the mist is removed. The washing liquid 2 is returned to the overflow tank 35, and all of the washing liquid 2 in the first washing tank 8 is removed.
The water washing tank 8 is emptied and the pump P3 is stopped.

In this case, when the electrodeposition overflow tank 35 overflows, the washing liquid 2 flows into the electrodeposition tank 11.

Next, open valve 46, close valve 44, and close valve 48.
, 49, 50 are opened to continue operating the pump P6, the washing liquid 2 in the ash liquid tank 13 flows from the pipe 43 to the pipes 45, 4.
7, the water flows into the empty washing tanks 8, 9, and 101 from the upper portions 8a, ga, and 10a, and is stored in these washing tanks 8, 9, and 10.

This continues until the washing liquid 2 is reduced to level A shown by a broken line in the washer liquid tank 13, and when level A is reached, the pump P6 is stopped. As a result, each of the washing tanks 8, 9, 10' will contain the washing liquid 2 in an amount that is not full. So valves 48, 49, 50,
52, 54, 56 are closed, valves 29, 31, 33, 1
4, 15, 18, 20 and pumps P3, P4, P
5, the risers 3, 4, 5, and 6 will shower approximately 3 powders at once, and the washing liquid 2 will be used to shower each washing liquid tank 8.
, 9 and 10 while cleaning each pipe and riser 3.
, 4, 5, 6 and the water washing chamber 7. Next, the valves 14, 15, 18, 20, 29,
'31, 33 are closed, valves 52, 54, 56 are opened, and pumps P3, P4, P5 are operated to
, 9 and 10 are emptied, and the washing liquid 2 is transferred to the dew overflow tank 3.
5 and return to the lightning tank 11.

When each washing tank 8, 9, 10 is empty, valves 52, 54, 56, 44, 46 are closed, valve 14,
15, 18, 20 to stop the operation of the separator 12 and remove water from the water washing tanks 8, 9, 10 to the risers 3, 4, 5, 6.
The circuit leading to the valve 37 is brought into a normal operating state, and then the valve 37 is turned on.
Open the dew overflow tank 3 by opening the separator 12 and operating the separator 12.
The electrocoating paint 59 of No. 5 is sent to the separating device 12 by pumps P7, P, , P2 to separate the paint and the washing liquid 2, and the washing liquid is returned to the monkey liquid tank 13 through the piping 40, and the washing liquid is returned to the monkey liquid tank 13. The empty water washing tank 10, 9 overflowed.
. The amount of paint that does not settle and solidify even if left for a long time without being washed is replaced with a very small amount of washing liquid 2.

Finally, close the valves 37, 42, and 46, open the valve 44, operate the pump P6, and pass the washing liquid 2 from the monkey liquid tank 13 through the pipes 43, valve 44, and pipe 40 to the UF tube 12a of the separation device 12. The paint content is returned to the overflow tank 35, and the interior of the separator 12 is replaced with the washing liquid 2, which has an extremely low paint content.Then, each valve is set to the normal operating state again, and the calendar timer is set. , the flow of the washing liquid 2 in the separation device 12, the washing tanks 8, 9, 10, and the monkey liquid tank 13 is stopped during the holiday period.

As a result, the pumps P, P2, separation device 12, and pumps P3, P5, which have conventionally been operated even during holidays, can be completely stopped. During holidays, the valve 61 is closed and the pump P7 is constantly operated.
Since the lightning coating paint 59 circulates and flows through the holiday operation section 58, it does not solidify.

Also, after the holidays, normal operation is automatically resumed using the calendar chimera.

Note that the above-mentioned process for processing the washing liquid 2 for suspension during holidays can be completed in about 2 hours to about 4 hours at the maximum.

'The present invention is configured as described above,
Therefore, in the cationic electrodeposition coating method, it is necessary to clean the washing tank, monkey liquid tank, and separation device that separates the paint and the washing liquid, and replace it with the washing liquid that contains less paint. As a result, there is no need to simulate washing liquid in main parts such as washing tanks during holidays.
Power loss during holidays can be significantly reduced,
The effect of saving energy can be obtained.

Furthermore, since it is possible to completely prevent the recovered paint from solidifying in the main parts such as the water washing tank, failures such as clogging in the pipes can be completely prevented, and the operation after holidays can always be carried out smoothly. Furthermore, by stopping the pumps and motors for the flushing liquid frame during holidays, damage to them can be reduced, and the effect of reducing factory noise can also be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a cationic electrodeposition washing liquid treatment apparatus according to an embodiment of the present invention. 1 is a treatment device for cationic electrodeposition washing liquid, 2 is a washing liquid, 3 is a riser for 0th washing, 4 is a riser for first washing, 5 is a riser for secondary washing, 6 is a riser for tertiary washing, 7 is a washing chamber, 7a is a bottom, 8 is a first washing tank, 9 is a second washing tank, 10 is a third washing tank, 11 is a military uniform tank, 12 is a separation device, 13 is a liquid transfer tank, 14, 25 ,26,27
, 31, 33, 48, 49, 50, 56 are valves, 15
, 18, 20, 37, 42, 44, 46, 52, 61 are auto valves which are examples of valves, 16, 17, 19, 2
1, 22, 23, 24, 36, 38, 39, 40, 41
, 43, 45, 47, 61, 53, 55, 57, 60 are piping, 35 is a dragonfly overflow tank, 58 is a constantly operating section,
59 is electrodeposition paint, P,, P2, P3, P4, P5, P6
, P7 are pumps. illustration ship

Claims (1)

[Scope of Claims] 1. A riser that injects a washing liquid onto a workpiece coated with electrodeposition, a washing chamber that receives the washing liquid sprayed and dropped from the riser, and a collection and storage storage for collecting the aqueous solution from the washing chamber. an electrodeposition tank in which the object to be coated is immersed and conveyed for electrodeposition coating; a separation device that separates the electrodeposition paint sent from the electrodeposition tank into paint and a washing liquid; and the separation device and a filtrate tank configured to store the washing liquid separated by the water washing tank and send it to the washing tank, in which a backwash circuit of the separation device is activated after the riser finishes washing the object to be coated with water. The washing liquid in the filtrate tank is sent to the separation device to clean the inside of the separation device, and each pipe and the inside of the separation device are replaced with the washing liquid, and the washing liquid in the washing tank is pumped to the electrodeposition. Empty the washing tank by returning it to an electrodeposition overflow tank provided adjacent to the tank,
Next, the washing liquid in the filtrate tank is pumped into the empty washing tank, and while stirring the washing liquid in the washing tank, the washing liquid is sent to the riser to wash the riser and the washing chamber again. The washing liquid in the washing tank is pumped back to the electrodeposition overflow tank to empty the washing tank, the circuit from the washing tank to the riser is put into a normal operating state, and then the separator is operated to The electrodeposition paint in the electrodeposition overflow tank is sent to the separation device by a pump to separate the paint and the washing liquid, and the washing liquid is returned to the filtrate tank, overflowing the filtrate tank and sent to the washing tank, and washing with water. The tank and the filtrate tank are filled with a washing liquid with a low paint content, and then the washing liquid in the filtrate tank is again sent to the separation device by a pump to wash the inside of the separation device, and each piping and the inside of the separation device are washed with water. A method for treating a cationic electrodeposition washing liquid, characterized in that the flow of the washing liquid in the separation device, the washing tank, and the filtrate tank is stopped during a holiday period. 2. A riser configured to spray a washing liquid onto a workpiece coated with electrodeposition, a washing chamber disposed below the riser to receive the washing liquid sprayed and dripped from the riser; A washing tank connected to a washing chamber and configured to collect and store the washing liquid from the washing chamber; and an electrode provided in a pre-process of the riser so that the object to be coated is immersed and conveyed for electrodeposition coating. a separation device connected to the electrodeposition tank and configured to separate the electrodeposition paint sent from the electrodeposition tank into paint and a washing liquid; A filtrate tank that stores the washing liquid and is connected to the washing tank and sends the washing liquid to the washing tank,
An electrodeposition overflow tank is provided adjacent to the electrodeposition tank, and the bottom of the electrodeposition overflow tank is connected to the bottom of the electrodeposition tank via a pump and piping to form a constantly operating section, and the always operating section The above-mentioned pipe is connected to the electrocoat inlet of the separator by another pipe via a valve and a pump, and the pipe is branched to communicate with the upper part of the electrocoat overflow tank via another pipe. The paint outlet of the device is further connected to the upper part of the electrodeposition overflow tank through another piping, and the washing liquid outlet of the separation apparatus is connected to the upper part of the filtrate tank via a valve via piping. is branched and connected to the bottom of the filtrate tank via a valve and a pump by another piping, further branched and connected to the upper part of the water washing tank via a valve and another pipe, and the water washing tank is connected to the bottom of the filtrate tank through a valve. The bottom of the filtrate tank is connected to the interior of the water washing tank and the riser by piping via a pump and a valve, and communicates with the top of the electrodeposition overflow tank, and the top of the filtrate tank and the top of the water washing tank are communicated with each other. A treatment device for cationic electrodeposition washing liquid featuring Naruko. 3. The piping connecting the flushing chamber and the flushing tank is a U-shaped pipe having one end connected to the bottom of the flushing chamber and the other end connected to a portion above the bottom. A method for treating a cationic electrodeposition washing liquid according to claim 2.