KR20190067749A - Apparatus for electro deposition coating reducing the use of rinsing water - Google Patents

Abstract

An electro deposition coating apparatus according to an embodiment of the present invention comprises: a first main tank provided with a first washing nozzle for spraying washing water; a first sub tank integrally provided outside the first main tank, and provided in communication with the first main tank to receive the washing water sprayed from the first washing nozzle; a first underwater pump disposed inside the first sub tank and connected to the first washing nozzle; a second main tank provided with a second washing nozzle for spraying washing water; a second sub tank integrally provided outside the second main tank, and provided in communication with the second main tank to receive the washing water sprayed from the second washing nozzle; a second underwater pump disposed inside the second sub tank and connected to the second washing nozzle; and a flowing pipe provided between the first sub tank and the second sub tank, and flowing the washing water received in the second sub tank to the first sub tank. Thus, maintenance of the electro deposition coating apparatus can be easily performed by an operator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electrodeposition coating apparatus,

More particularly, the present invention relates to an electrodeposition coating apparatus, and more particularly, it relates to an electrodeposition coating apparatus which does not leak water to a work site even when a pump for flowing wash water flows, To an electrodeposition painting apparatus.

Electrodeposition coating is a process to coat the inside and outside of a coated film with a uniform film by immersing the object to be painted in electrodeposition paint. It is widely used for primer of metal products, and electrophoresis (electrophoresis) coating.

The principle of electrodeposition coating is to deposit a metallic coating material in a tank containing a water-soluble coating material and to deposit a coating electrically on the surface of the coating material by applying a current, using cation particles as a cathode and anion particles as an anode Anionic electrodeposition coating that connects the substrate to the anode, and a cationic electrodeposition coating that connects the substrate to the cathode.

Electrodeposition coating is carried out through a number of processes including preliminary degreasing which removes rust-preventive oil and processing oil, which are present on the surface of the substrate, with an alkaline degreasing agent to which a surfactant is added, this degreasing to remove rust- A plurality of rinsing steps for removing the degreasing agent remaining on the surface of the base material after completion of the degreasing, a surface adjustment of the surface of the base material for obtaining an even coating film by improving the oxide film on the surface of the base material, A washing step of washing the chemical conversion coating liquid remaining on the surface of the coating film or the like, an electrodeposition step of depositing the coating material on the water-soluble coating material and applying a current between the coating material and the counter electrode to form a coating film on the coating material, A UF (Ultra filtration) water washing process for washing and removing the paint adhered by the tension, a coating agent DI water, pure water proceeds in three process, the drying process in order to dry the electrodeposited coating for a film which is washed with water to complete (true, DI water) improves the appearance quality of the coating.

This electrodeposition coating is performed in an electrodeposition coating apparatus in which a plurality of tanks in which a degreasing liquid, a wash water, a coating liquid, a UF filtrate, and the like are respectively stored are arranged in a line. Each process is connected to each other, The piping is constituted so as to be used a plurality of times in cooperation with the process of the piping, and a flow path of a complicated piping structure is usually formed.

Particularly, if the washing water and the UF filtrate, which are used in the water washing process, the UF washing process, and the UF washing process, respectively, are not circulated to the next process, the amount of washing water or the UF filtrate is increased, Since the piping is supplied separately from the outside and supplied with the UF filtrate, it is designed with a complicated piping structure, which makes maintenance difficult.

In addition, the circulation pump installed on the outside of the flushing tank is an important device that circulates flushing water and is operated throughout the operation time of the electrodeposition coating apparatus. When the circulation pump fails during the nighttime operation, the flushing water flows out to the workplace Therefore, it is necessary to develop an electrodeposition coating apparatus having a structure in which the flow path structure is simply designed to facilitate maintenance, and the leakage of wash water and the like even when the pump fails.

A problem to be solved by the present invention is to provide an electrodeposition coating apparatus in which water and water are not discharged to a work site even when a pump for flowing wash water is flown, the flow path is simple and maintenance is easy, and use of wash water is saved .

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to an aspect of the present invention, there is provided an electrodeposition coating apparatus including a first main tank having a first cleaning nozzle for spraying wastewater; A first drain disposed at one side of a lower end of the first main tank and discharging wastewater to the outside; A first sub tank which is integrally provided outside the first main tank and communicates with the first main tank through the opening to receive the water discharged from the first washing nozzle; A first submerged pump disposed inside the first sub tank and connected to the first cleaning nozzle; A second main tank having a second cleaning nozzle for spraying wash water; A second drain disposed at one side of the lower end of the second main tank for discharging wastewater to the outside; A second sub tank integrally provided outside the second main tank and communicating with the second main tank through the opening to receive the water discharged from the second cleaning nozzle; A second submerged pump disposed inside the second sub tank and connected to the second cleaning nozzle; A flow pipe provided between the first sub tank and the second sub tank for flowing wash water contained in the second sub tank to the first sub tank; A filter disposed in the first sub tank and provided between the first main tank and the first submerged pump to block foreign matter from flowing into the first sub tank; A sieve guide provided in an oblique direction on an inner surface of the first sub tank to support both sides of the sieve; A supply pipe for branching into T and connected to one side of the first sub tank and the other side to the second sub tank and supplying external industrial water to the second sub tank; A main valve disposed between the supply pipe and the second sub tank; And a reserve valve provided between the supply pipe and the first sub tank and opened or closed such that the external industrial water is directly supplied to the first sub tank; .

The first submerged pump is disposed so as to be submerged in the wash water contained in the first sub tank and is supplied to the upper end of the first submerged pump with the water intake hole formed at the lower end of the first submerged pump, The water washing water can be discharged to the water supply pipe and the water washing water can be supplied to the first washing nozzle.

A first dispenser disposed at an upper end of the first sub tank and having an upper portion opened to allow the water to flow therein; And a first preliminary drain pipe communicating with the first dispenser and disposed outside the first sub tank for discharging the wash water introduced into the first dispenser to the outside; As shown in FIG.

In addition, the flow pipe may be disposed in the first sub tank on the first underwater pump side with respect to the drawing guide.

The apparatus may further include a check valve provided in the flow pipe to prevent the water in the first sub tank from flowing back to the second sub tank.

The water washing water may be a UF filtrate and may further include an exhaust module provided in the first sub tank to supply the UF filtrate to an electrodeposition tank in which an electrodeposition process is performed.

The discharge module may further include a discharge pipe for flowing the UF filtrate to the electrodeposition vessel; And a discharge pump provided in the discharge pipe to flow the UF filtrate; . ≪ / RTI >

The details of other embodiments are included in the detailed description and drawings.

According to the electrodeposition coating apparatus according to the embodiment of the present invention, the pump for supplying the wash water is implemented by an underwater pump, so that the flow path is made simpler than the case where the pump is installed outside the conventional water storage tank, Can be easily maintained.

Further, even when the first submerged pump fails, the first sub tank receives the wash water, so that the wash water can be prevented from flowing out to the work place.

In addition, since the number of flushes of the second sub tank is flowed to the first sub tank through the flow pipe, it becomes unnecessary to constitute a separate flow path for the flush water used in the second flushing process to be used in the first flushing process, The configuration is simplified.

In addition, since the external industrial water supplied to the supply pipe is used in the second water washing step, it can be immediately used in the first water washing step requiring a relatively low degree of cleanliness. In the conventional case, 2ton of industrial water is used for one processing cycle The electrodeposition coating apparatus of the present invention can save 1.5 tons of industrial water by using industrial water of 0.5ton.

Further, the flow path configuration for recovering the UF filtrate is simply constituted by the second sub tank, the floating pipe, the first sub tank, and the discharge module, so that the operator can easily maintain the maintenance.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic view of an electrodeposition painting apparatus according to an embodiment of the present invention.
2 is a side schematic view of a first main tank and a first sub tank according to an embodiment of the present invention.
3 is a perspective view of the electrodeposition painting apparatus shown in Fig.
4 is a perspective view of a first sub tank in which a filtering net according to an embodiment of the present invention is removed.
5 is a schematic view of an electrodeposition painting apparatus according to another embodiment of the present invention.
6 is a flowchart of an electrodeposition coating process carried out by the electrodeposition coating apparatus of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Even if the terms are the same, it is to be noted that when the portions to be displayed differ, the reference signs do not coincide.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

The terms first, second, etc. in this specification may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a schematic side view of a first main tank 110 and a first sub tank 130 according to an embodiment of the present invention, and FIG. 2 is a schematic side view of the first main tank 110 and the first sub tank 130 according to an embodiment of the present invention. FIG. 1 is a schematic view of an electrodeposition painting apparatus according to an embodiment of the present invention. FIG. 3 is a perspective view of the electrodeposition coating apparatus shown in FIG. 1, and FIG. 4 is a perspective view of a first sub tank 130 removing a sieve 131 according to an embodiment of the present invention.

1 to 4, an electrodeposition coating apparatus according to an embodiment of the present invention includes a first main tank 110 having a first cleaning nozzle 140 for spraying wastewater, a second main tank A first sub tank 130 and a second sub tank 130 which are provided integrally with the first main tank 110 and are connected to the first main tank 110 to receive the water discharged from the first cleaning nozzle 140, A second main tank 210 having a first submerged pump 150 disposed inside the first submerged nozzle 140 and connected to the first submerged nozzle 140 and a second submerged nozzle 240 injecting the submerged water, A second sub tank 230 integrally provided outside the first sub tank 210 and communicating with the second main tank 210 to receive the water discharged from the second cleaning nozzle 240, A second submerged pump 250 disposed inside the first sub tank 230 and connected to the second cleaning nozzle 240 and a second sub tank 250 disposed between the first sub tank 130 and the second sub tank 230, The water contained in the water And a flow pipe (310) for flowing the fluid to the tank (130).

Here, the first main tank 110 and the second main tank 210 of the present invention may be used in a first water washing step (S40), a second water washing step (S50) set, and a second water washing step 3 wash (S80) and the fourth wash (S90) set.

If the first main tank 110 is subjected to the first water washing process S40, the second main tank 210 is subjected to the second water washing process S50. According to another embodiment of the present invention, when the first main tank 110 is subjected to the third water washing process (S80), the second main tank 210 is subjected to the fourth water washing process (S90). In the following description, it is described that the first main tank 110 is subjected to the first water washing step (S40) and the second main tank 210 is performed for the second water washing step (S50) according to an embodiment of the present invention do.

The substrate is initially washed in the first main tank 110 by the first water washing process (S40), then in the second main tank 210 to the second washing process (S50), as described later. After the foreign matters are primarily removed in the first water washing step (S40), the substrate is cleaned more cleanly than the first water washing step (S40) secondarily for the next step in the second water washing step (S50). In this case, in the second water washing step (S50), the object is washed with wash water relatively cleaner than the wash water in the first water washing step (S40) as described later.

The first main tank 110 is filled with water. In the first main tank 110, a first cleaning nozzle 140 for spraying wash water is provided. The first cleaning nozzle 140 may be composed of a plurality of spray nozzles for spraying wash water. At one side of the lower end of the first main tank 110, a first drain 120 for discharging the wash water to the outside may be provided.

The object is drawn into the first main tank 110. The workpiece is conveyed by the jig connected to the conveyor and introduced into the first main tank 110. The substrate is made of a metal that can be electrodeposited. On the surface of the substrate, foreign matter of at least one of anti-corrosive oil, processing oil, dust, and degreasing agent may be present.

The first sub tank 130 is disposed outside the first main tank 110. The first sub tank 130 is integrally provided with the first main tank 110 and may be disposed at the lower end of the first main tank 110.

The first sub tank 130 is provided so as to communicate with the first main tank 110 so that the water discharged from the first main tank 110 flows. 4, an opening S is formed between the first sub tank 130 and the first main tank 110 so that water can be flowed through the opening. Accordingly, the first sub tank 130 receives the water discharged from the first cleaning nozzle 140.

The first submerged pump (150) is disposed inside the first sub tank (130). The first submerged pump 150 is an electric pump that operates underwater and operates by receiving electricity from an external power source.

The first submerged pump (150) is disposed so as to be submerged in the wash water stored in the first sub tank (130). The first submerged pump 150 is supplied with wash water through the inlet hole 151 formed at the lower end and discharges the wash water through the drain pipe 153 provided at the upper end of the first submerged pump 150.

The first submerged pump 150 is connected to the first cleaning nozzle 140 provided in the first main tank 110. In this case, the water pipe 153 and the first washing nozzle 140 may be connected to each other by a pipe or a hose l. The first submerged pump 150 supplies wash water to the first wash nozzle 140 so that the wash water is sprayed from the first wash nozzle 140.

In the electrodeposition coating apparatus of the present invention, the pump for supplying wash water is implemented by an underwater pump, so that the flow path is made simple as compared with the case where the pump is installed outside the existing wash tank, so that the operator can easily maintain the electrodeposition coating apparatus And the first sub tank 130 receives the wash water even in the event of a failure of the pump, so that the wash water can be prevented from flowing over the work site.

As shown in FIGS. 2 to 4, the first sub tank 130 may be provided with a filtering net 131. The water line 131 may be provided between the first main tank 110 and the first submerged pump 150. The filter 131 is formed in a mesh structure at the center so that the foreign matter contained in the wash water flows to the first sub tank 130 after the water is washed in the first main tank 110, 150). A hollow 132 is formed in the sieve 131 so that the hose 1 connecting the first submerged pump 150 and the first cleaning nozzle 140 can be passed through.

A sieve guide 133 may be provided in the first sub tank 130. The filtering guide 133 is provided in an oblique direction on the inner surface of the first sub tank 130. The sieve guide 133 supports both sides of the sieve 131 in the first sub tank 130.

A first preliminary drain portion 170 may be provided at an upper end of the first sub tank 130. When the first sub tank 130 is overfilled with the water for the first sub tank 130 due to a failure of the first submergible pump 150 or a failure of the reserve valve 430 and the first sub tank 130 is filled with industrial water, The first preliminary drain portion 170 disposed at the upper end of the sub tank 130 discharges the wash water to the outside so that the water wash water does not flood into the work place.

The first preliminary drain portion 170 according to an embodiment of the present invention includes a first dispenser 171 disposed at the upper end of the first sub tank 130 and having an upper opening to allow water to be inflow, a first dispenser 171 And a first preliminary drain pipe 173 connected to the first sub tank 130 and discharging the wash water introduced into the first dispenser 171 to the outside.

The first dispenser 171 is disposed inside the first sub tank 130 and disposed at the upper end, as shown in FIG. The first dispenser 171 is formed to open at an upper portion thereof, and when water is filled in the first sub-tank 130, water is introduced into the opened upper portion.

The first preliminary drain pipe 173 is provided so as to communicate with the first dispenser 171. One end of the first preliminary drain pipe 173 is provided outside the first sub tank 130, and the other end is connected to a line (not shown) for discharging the wash water to the outside. The first preliminary drain pipe 173 discharges the wash water introduced through the first dispenser 171 to the outside so that the water from the first sub tank 130 does not flood the work site.

When the first main tank 110 is used in the first water washing step S40 as described above, the second main tank 210 is used in the second water washing step (S50) after the first water washing step (S40) The substrate is flushed in the first main tank 110 and then introduced into the second flushing process (S50) from the second main tank 210. In this case, in the second water washing step (S50), the object water is washed with wash water relatively cleaner than the washing water in the first washing step (S40).

The second sub tank 230, the second cleaning nozzle 240, the second submerged pump 250, the second preliminary drain portion 270, the second dispenser 271, the second sub tank 230, The preliminary drain pipe 273, the second filtering net 231 and the second drain 220 are connected to the first main tank 110, the first sub tank 130, the first cleaning nozzle 140, The first preliminary drain portion 170, the first dispenser 171, the first preliminary drain pipe 173, the first filtering net 131 and the first drain 120, detailed description thereof will be omitted. And explain the difference.

The second main tank 210 is filled with water. A second cleaning nozzle 240 for spraying wash water is provided in the second main tank 210. The second cleaning nozzle 240 may be composed of a plurality of spray nozzles for spraying the wash water. A second drain 220 may be provided at one side of the lower end of the second main tank 210 to discharge water from the outside if necessary.

The second sub tank 230 is disposed outside the second main tank 210 in the same manner as the first sub tank 130. The second sub tank 230 may be integrally formed with the second main tank 210 and may be disposed at the lower end of the second main tank 210.

The second sub tank 230 is provided so as to communicate with the second main tank 210 so that the water contained in the second main tank 210 flows. An opening is formed between the second sub tank 230 and the second main tank 210 in the same manner as between the first sub tank 130 and the first main tank 110 so that water can be flowed through the opening . Accordingly, the second sub tank 230 receives the water discharged from the second cleaning nozzle 240.

A flow pipe 310 is provided between the first sub tank 130 and the second sub tank 230. The flow pipe 310 allows the first sub tank 130 and the second sub tank 230 to communicate with each other. The flow pipe 310 allows the water contained in the second sub tank 230 to flow to the first sub tank 130 communicated with the second sub tank 230.

That is, when the object is subjected to the first water washing step (S40) and then the second water washing step (S50), the flow pipe 310 is used in the second water washing step (S50) accommodated in the second sub tank 230 Water with low contamination level flows into the first sub tank 130 so that it can be used as wash water in the first sub tank 130. [

In this case, the wash water can be used in the first water washing step (S40), which requires a relatively low degree of cleanliness after the water washing step is used in the second water washing step (S50), which requires a relatively high degree of cleanliness, There is an effect that the industrial water is saved.

The water in the second sub tank 230 flows to the first sub tank 130 through the flow pipe 310 and the water used in the second water washing step S50 is discharged to the first water washing step S40 There is no need to construct a separate flow path for use, and the overall flow path configuration is simplified.

The flow pipe 310 may be provided with a check valve 320. The check valve 320 is opened or closed only when the water wash water flows from the second sub tank 230 to the first sub tank 130 and the water from the first sub tank 130 to the second sub tank 230 flows backward In order to prevent the above-mentioned problems. Accordingly, the relatively high-contaminated water of the first sub tank 130 is prevented from flowing into the second sub tank 230.

An auxiliary pump (not shown) may be additionally installed if necessary in order to smoothly flow wash water from the second sub tank 230 to the first sub tank 130 through the flow pipe 310. The amount of the wash water stored in the second main tank 210 and the second sub tank 230 by the external supply water supplied to the second sub tank 230 is the same as that of the first main tank 110, 1 sub tank 130, and the water wash water may flow to the first sub tank 130. [0053] As shown in FIG.

The supply pipe 410 supplies external industrial water to the electrodeposition coating apparatus. In the supply pipe 410 according to an embodiment of the present invention, the pipe connected to the outside is branched into T-shaped so that one side is connected to the first sub tank 130 and the other side is connected to the second sub tank 230.

The supply pipe 410 supplies external industrial water to the second sub tank 230. That is, the clean external industrial water is supplied to the second sub tank 230 so as to be used first in the second water washing step (S50) in which the water is washed with a relatively high degree of cleanliness than the first water washing step (S40). In this case, the piping connected to the second sub tank 230 side is provided with a main valve 420 that can be opened and closed, so that the supply amount of the industrial water can be adjusted.

The supply pipe 410 may be provided with a preliminary valve 430 that is opened or closed so that external industrial water is directly supplied to the first sub tank 130. In this case, the reserve valve 430 may be provided on the first sub tank 130 side.

When the pollution degree of the wash water used in the first water washing step (S40) increases and the washing quality deteriorates, the reserve valve 430 is opened to supply clean external industrial water directly to the first sub tank 130, It is possible to dilute the wash water with the industrial water to reduce the degree of contamination and use it as wash water in the first water washing step (S40).

The flow pipe 310 is disposed on the first submerged pump 150 side with respect to the sieve guide 133 as shown in Fig. The fluid pipe 310 is spaced from the opening S of the first main tank 110 as far as possible and disposed as close as possible to the first submerged pump 151. 4, an opening 311 at one side of the flow pipe 310 is disposed so as to communicate with the first submerged pump 150 side.

That is, the flow pipe 310 is a passage through which the clean water of the second water washing step (S50), which is cleaner than the wash water in the first water washing step (S40), is supplied to the first sub tank (130) The first submerged pump 150 is disposed at a position where water can be supplied immediately.

Accordingly, the water rinse water supplied through the flow pipe 310 is separated as much as possible from the relatively contaminated water in the first main tank 110 and is directly supplied to the first submerged pump 150, ), And can be used to clean the object in a relatively less polluted state.

5 is a schematic view of an electrodeposition painting apparatus according to another embodiment of the present invention.

In another embodiment of the present invention shown in Fig. 5, differences from the above-described components are mainly described, and unless otherwise specified, the description shown in Figs. 1 to 4 is replaced.

Referring to FIG. 5, the first main tank 110 and the second main tank 210 according to another embodiment of the present invention are subjected to the processes of the UF I washing process (S 110) and the UF II washing process (S 120) set process The first main tank 110 is subjected to the UFI washing process S110 and the second main tank 210 is subjected to the UFII washing process S120

In this case, the wash water is carried out in the UF filtrate. The UF filtrate is a liquid with ultrafiltration (UF), which can be carried out with the liquid passing through the UF module. The UF module and the ultrafiltration are well known techniques and detailed description is omitted.

The UF filtrate is supplied to the second sub tank 230. In this case, according to another embodiment of the present invention, the supply pipe 410 can supply the UF filtrate to the second sub tank 230 instead of the industrial water, and the UF module that supplies the UF filtrate to the supply pipe 410 Can be connected.

The UF filtrate supplied to the second sub tank 230 is supplied to the second cleaning nozzle 240 by the second submerged pump 250 and is sprayed onto the substrate to be used in the UFII wash process S120 of the substrate. The UF filtrate used in the UF II water washing process (S120) is collected in the lower portion of the second main tank 210 by collecting the remaining coating material except for the finished coating film formed on the surface of the coating material.

The UF filtrate recovering the paint flows to the second sub tank 230 through the opening and then flows into the first sub tank 130 by the flow pipe 310. The UF filtrate that has flowed into the first sub tank 130 is supplied to the first cleaning nozzle 140 by the first underwater pump 150 and then sprayed onto the workpiece after the electrodeposition process S100, .

The UF filtrate used in the UF I washing process (S110) is collected in the lower portion of the first main tank 110 by collecting the remaining paint of the object. In this case, the UF filtrate contained in the lower portion of the first main tank 110 contains more paint than the UF II water-washing process (S120).

The first sub tank 130 is provided with a discharge module 500. The discharging module 500 is connected to the electroplating bath 600 where the electrodepositing process S100, which is a previous process of the UF I washing process S110, is performed.

The electrodeposition base 600 is a tank in which an electrodeposition process (S100) of the substrate is performed, and a coating fluid containing electrodeposition paint is contained in the electrodeposition base. The electrodeposition base 600 may further include a drain portion 610 for discharging the paint liquid to the outside and a paint supply pipe 620 for supplying a new paint liquid to the electroplating main body 600 from the outside.

In the electrodeposition process S100, an anion or a cation electrodeposition process (S100) may be performed on the substrate immersed in the electrodeposition substrate 600, and detailed description thereof will be omitted.

The discharging module 500 supplies the UF filtrate to the electroplating bath 600 where the electrodeposition process is performed. In this case, the drain module 500 may comprise a drain pipe 520 for flowing the UF filtrate to the electroplating bath 600 and a drain pump 510 for flowing the UF filtrate. The coating material contained in the UF filtrate supplied to the electrodeposition base 600 through the discharge module 500 is reused as a coating material in the electrodeposition base 600.

Since the UF filtrate supplied to the electrodeposition bath used in the UFII water washing process (S120) and the UF I water washing process (S110) contains a large amount of electrodeposition coating and is supplied to the electrodeposition bath and reused, the electrodeposited coating can be saved, The flow path for recovering the filtrate is simply constituted by the second sub tank 230, the flow pipe 310, the first sub tank 130 and the discharge module 500, so that the operator can easily maintain the flow structure .

The first sub tank 130, the first submerged pump 150, the second sub tank 230, the second submerged pump 250, and the flow pipe 310 are provided in the same manner as in the embodiment of the present invention. It is structured so that the operator can easily maintain it, and overflow of the UF filtrate to the workplace in an emergency can be prevented.

6 is a flowchart of an electrodeposition coating process carried out by the electrodeposition coating apparatus of the present invention.

6, the electrodeposition coating process carried out by the electrodeposition coating apparatus of the present invention comprises a bale process S10, a preliminary degreasing process S20, a main degreasing process S30, a first washing process S40, (S50), surface adjustment (S60), chemical conversion coating (S70), third water washing step (S80), fourth water washing step (S90), electrodeposition step (S100), UFI washing step (S110) S120), and a drying step (S130).

The bubbling step S10 is a step of primarily removing foreign substances such as rust-preventive oil, processing oil, and dust existing on the surface of the substrate. In the boiling step S10, the substrate is dipped in the bath liquid in the bath bath to clean the surface of the substrate, and the bath liquid may contain caustic soda and the like, and the temperature may be 40 to 50 ° C.

The preliminary degreasing step (S20) is a step of removing rust preventive oil, processing oil, dust, and the like existing on the surface of the substrate after an electrolysis (S10) with an alkaline degreasing agent to which a surfactant is added. The preliminary degreasing step (S20) can be carried out by spraying a degreasing solution to which a degreasing agent is added with a spray nozzle onto the substrate.

The degreasing step (S30) is a step of finally removing foreign matters remaining on the surface of the substrate before the surface adjustment (S60) of the substrate. The substrate is immersed in the degreasing bath of the present degreasing step (S30). The degreasing step (S30) may be performed two or more times, and the surface of the substrate on which the degreasing step (S30) has been completed is left in a state in which foreign substances such as anti-rust oil, processing oil and dust have been removed, but the degreasing agent remains.

According to an embodiment of the present invention, the first water washing step S40 is performed in the first main tank 110 and the second water washing step S50 is performed in the second main tank 210 after the main degassing step S30 .

The first water washing step (S40) is a step of spraying washed water with the first washing nozzle (140) to remove the degreasing agent remaining on the surface of the object. The wash water in the first water washing step S40 according to the embodiment of the present invention is a water washing water flowing in the first sub tank 130 through the fluid pipe 310 after being used in the second water washing step S50 Is used.

The wash water flowing into the first sub tank 130 is used as wash water in the first wash step (S40) by the first underwater pump 150. In this case, the water in the first sub tank 130 can be prevented from flowing to the second sub tank 230 by the check valve 320 installed in the flow pipe 310.

The second water washing step (S50) is a step of spraying wash water onto the substrate to wash the substrate, as in the first washing step (S40). An external industrial water can be used as the wash water in the second water washing step (S50), and is performed at a degree of cleanliness higher than that of the wash water in the first washing step (S40).

The wash water used in the second water washing step S50 flows into the first sub tank 130 through the fluid pipe 310 as described above and the auxiliary pump (not shown) .

After the second water washing step (S50) is completed, a uniform surface is formed through the surface adjusting step (S60), and a homogeneous zinc phosphate coating is formed through the chemical coating step (S70). The surface adjusting step S60 and the chemical conversion coating step S70 are not described in detail with reference to the known art.

After the chemical coating step S70, a third water washing step S80 is performed in the first main tank 110 and a fourth water washing step S90 is performed in the second main tank 210, according to another embodiment of the present invention. .

In the third water washing step (S80) and the fourth water washing step (S90), the weakly acidic chemical liquor remaining on the substrate is washed. Detailed processes of the third water washing step (S80) and the fourth water washing step (S90) are the same as those of the first washing step (S40) and the second washing step (S50), and therefore their detailed description will be omitted.

If necessary, three pure water steps may be performed after the fourth water washing step (S90). The pure water washing step is a step of washing the object with pure water (deionized water) so as to remove the object ions contained in the wash water remaining in the object after the fourth water washing step (S90). When the pure water treatment is carried out, the incident ions remaining on the workpiece are removed, and the coating efficiency in the electrodeposition process (S100) is increased.

The electrodeposition process S100 is a process for submerging a workpiece in a coating solution stored in the electrodeposition base 600 and applying a current to the base and the counter electrode provided in the electrodeposition base 600 to form a coating film on the surface of the substrate. And a cation electrodeposition process can be performed, and detailed description thereof will be omitted as a known technique.

The ultrafiltration (UF) water washing process is a process of washing and removing the paint adhering to the surface of the coated film deposited in the electrodeposition process (S100). According to another embodiment of the present invention, the first main tank 110 is carried out in the UFI flushing process (S110), and the second main tank 210 is carried out in the UF II flushing process (S120)

The paint remaining on the workpiece is recovered through the UF I water washing process (S110) and the UF II water washing process (S120) through the UF filtrate and then recovered to the electro-deposition main body 600 by the discharge module 500, .

The substrate on which the UF II water washing process (S120) is completed is dried (S130) to form a finished coating film.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

110: first main tank 130: first sub tank
150: first submerged pump 210: second main tank
230: Second sub tank 250: Second submerged pump
W: Wash water or UF filtrate M: Coating material

Claims (7)

A first main tank having a first cleaning nozzle for spraying wash water;
A first drain disposed at one side of a lower end of the first main tank and discharging wastewater to the outside;
A first sub tank which is integrally provided outside the first main tank and communicates with the first main tank through the opening to receive the water discharged from the first washing nozzle;
A first submerged pump disposed inside the first sub tank and connected to the first cleaning nozzle;
A second main tank having a second cleaning nozzle for spraying wash water;
A second drain disposed at one side of the lower end of the second main tank for discharging wastewater to the outside;
A second sub tank integrally provided outside the second main tank and communicating with the second main tank through the opening to receive the water discharged from the second cleaning nozzle;
A second submerged pump disposed inside the second sub tank and connected to the second cleaning nozzle;
A flow pipe provided between the first sub tank and the second sub tank for flowing wash water contained in the second sub tank to the first sub tank;
A filter disposed in the first sub tank and provided between the first main tank and the first submerged pump to block foreign matter from flowing into the first sub tank;
A sieve guide provided in an oblique direction on an inner surface of the first sub tank to support both sides of the sieve;
A supply pipe for branching into T and connected to one side of the first sub tank and the other side to the second sub tank and supplying external industrial water to the second sub tank;
A main valve disposed between the supply pipe and the second sub tank; And
A preliminary valve provided between the supply pipe and the first sub tank and opened or closed such that the external industrial water is directly supplied to the first sub tank;
And an electrodeposited coating device.
The method according to claim 1,
Wherein the first submerged pump is disposed so as to be submerged in the wash water contained in the first sub tank, and the wash water is supplied to the inlet hole formed at the lower end of the first submerged pump, And discharging the wash water to a water outlet pipe to supply the wash water to the first wash nozzle.
The method according to claim 1,
A first dispenser disposed at an upper end of the first sub tank and having an upper opening to allow water to flow therein; And
A first preliminary drain pipe communicating with the first dispenser and disposed outside the first sub tank for discharging the wash water introduced into the first dispenser to the outside;
Wherein the electrodeposition coating apparatus further comprises:
The method according to claim 1,
Wherein the flow pipe is disposed in the first sub tank with respect to the first submerged pump with respect to the drawing guide.
The method according to claim 1,
Further comprising a check valve provided on said flow pipe to prevent water flushing of said first sub tank from flowing back to said second sub tank.
The method according to claim 1,
The wash water is a UF filtrate,
And a discharge module provided in the first sub tank for supplying the UF filtrate to an electrodeposition tank where an electrodeposition process is performed.
The method according to claim 6,
The discharge module comprising: a discharge pipe for flowing the UF filtrate into the electrodeposition bath; And
A discharge pump provided in the discharge pipe to flow the UF filtrate;
And an electrodeposited coating device.

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