JP2005081279A - Work surface treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work surface treatment apparatus with which enlargement of the facility is suppressed and the waste amount of a washing solution is suppressed to the minimum in a tact type work surface treatment. <P>SOLUTION: In a first washing part 18 immediately after a chemical conversion treatment part (a chemical solution treatment part)16, a small amount of the washing solution is sprayed by a spray nozzle 28 to a work 12 immediately after the chemical conversion treatment for carrying out pre-washing, and successively, the washing solution is showered by a shower nozzle 30 to the work 12 for main washing after the pre-washing. When pre-washing, a valve MV-3 is closed and a valve MV-4 is opened to discharge only the pre-washing solution. When main washing, the valve MV-3 is opened and the valve MV-4 is closed to turn the main washing solution back to a storage tank 24 to be repeatedly circulated and used for the washing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in cleaning liquid reduction in a workpiece surface treatment apparatus, and more particularly, in a workpiece surface treatment apparatus that cleans a workpiece after the workpiece is surface treated with a chemical solution.

  Conventionally, when painting processing on machine parts (hereinafter referred to as workpieces), as a pre-treatment process prior to the actual application of paint, oil and fat substances adhering to the workpiece (machines that adhere to the workpiece during pressing or machining) A degreasing treatment for washing away oil, rust-preventing oil, etc., a chemical treatment for preventing the corrosion of the workpiece and increasing the adhesion of the paint in the painting process. In such degreasing and chemical conversion treatments, a dedicated chemical solution is applied to the workpiece by a spray method or a dip method, and each surface treatment is performed. However, after each treatment step, a degreasing agent or excessive chemical conversion treatment is applied. A cleaning step is arranged to remove, i.e. wash away, the agent. Cleaning methods include a shower ring method in which a cleaning liquid (usually water of a predetermined purity or higher) is showered on the work using a shower nozzle, and a dip method in which the entire work is immersed in a bath filled with the cleaning liquid. Etc. The quality of the coating in the coating process is greatly affected by the quality of the cleaning with the cleaning liquid.

  By the way, when fresh water (unused cleaning liquid) is always used in the cleaning process and the cleaning liquid is discarded by one cleaning, the consumption of the cleaning liquid becomes enormous and the disposal cost also increases. Therefore, usually, two or more cleaning steps after the degreasing step and the chemical conversion treatment step are provided, and in each cleaning step, the used cleaning liquid is circulated. That is, the cleaning liquid that has been used once is collected and used again. In this case, since the chemical solution is diluted as the process proceeds to the subsequent cleaning step, the cleaning effect increases as the number of cleaning steps increases. However, as the number of times the cleaning liquid is reused, the ratio of the chemical liquid in the cleaning liquid increases. Therefore, a predetermined amount of fresh water is supplied only to the last cleaning step, and the overflowed cleaning solution (the amount corresponding to the amount of supplied fresh water) is supplied to the previous cleaning step, and the overflowed cleaning solution is further supplied to the previous step. It is repeatedly supplied to the cleaning process. And only the washing | cleaning liquid which overflowed in the washing | cleaning process immediately after a chemical | medical solution processing process (a degreasing process or a chemical conversion treatment process) is discarded. In this way, workpiece cleaning efficiency is improved while reducing the waste amount of the cleaning liquid by performing the cleaning step by step with the cleaning liquid having the small chemical content in order from the cleaning process immediately after the chemical processing process. In this case, fresh water is supplied so that the concentration of the cleaning liquid in the final cleaning process is, for example, 1/1000 of the cleaning liquid concentration immediately after the chemical processing process. In addition, for the purpose of efficiently removing the chemical solution and reducing the processing in the subsequent cleaning process, air blow is applied to the workpiece after the chemical solution treatment, and the chemical solution attached to the workpiece is blown off to a certain extent, and then drained. There is a proposal to improve the chemical removal efficiency by performing a cleaning process (for example, Patent Document 1).

JP-A-8-218188

  When performing the surface treatment of the workpiece, when the workpiece to be processed is mass-produced, a continuous processing method is adopted in which the workpiece is sequentially processed while being conveyed by a high-speed conveyor or the like. In the case of the continuous processing method, since the work is transported in a continuous tunnel-shaped booth, the processing in the washing process such as liquid draining as described above is reduced by appropriately dividing the entire length of the booth into the required number of zones. This process can be easily formed. In addition, since it is necessary to prevent mutual interference between the processing zones, a space is maintained in advance between the processing steps to some extent. Therefore, a liquid draining zone or the like can be formed using the space portion. On the other hand, in the case of small-scale production, a tact method is adopted in which the processing time in each processing step can be easily adjusted. In the case of the tact method, individual processing booths are prepared, and the work suspended by an overhead conveyor or the like stops at the position of each processing booth and is dropped into the processing booth. That is, intermittent processing is performed on the workpiece.

  In this case, since the processing booth is formed for each processing, when the process for reducing the processing in the cleaning process such as draining as described above is performed in the cleaning process immediately after the chemical processing process. Since the excluded chemical enters the same area as the cleaning process, the chemical content in the cleaning process increases, and as a result, the degree of contamination of the cleaning liquid used in the cleaning process increases with the desired cleaning effect. It can no longer be obtained. On the other hand, when a new booth for liquid draining is newly established, there arises a problem that the scale of the entire coating processing apparatus is increased, and the equipment cost is increased. Of course, increasing the number of cleaning steps reduces the cleaning load in each cleaning step, but increases the equipment scale.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a work surface treatment apparatus capable of minimizing the amount of cleaning liquid discarded while suppressing an increase in equipment size in a tact type work surface treatment apparatus.

  According to the present invention, two types of cleaning, pre-cleaning and main cleaning, are performed in the cleaning unit immediately after the chemical solution processing unit. Then, only the cleaning liquid used for the pre-cleaning is discarded, and the cleaning liquid used for the main cleaning is recovered and used again for the pre-cleaning or the main cleaning.

  According to one aspect of the present invention, there is a tact-type processing apparatus that intermittently performs surface treatment for each work process on a conveyed workpiece, and a chemical treatment unit that performs surface treatment with a chemical on the workpiece. And a cleaning unit that is provided at a subsequent stage of the chemical processing unit and that applies a cleaning liquid to the workpiece after the chemical processing and replaces and removes the liquid adhering to the workpiece. A plurality of stages are formed, and the last cleaning section is provided with fresh water supply means for supplying fresh water to maintain the concentration of the cleaning liquid used in the last cleaning section below a predetermined value. Return supply means is provided for sequentially supplying the cleaning liquid overflowed by the supply of the fresh water back to the preceding cleaning section. The cleaning section immediately after the chemical processing section supplies the cleaning liquid to the workpiece after the chemical processing, Before cleaning The pre-cleaning means, the main cleaning means for supplying the cleaning liquid to the pre-cleaned workpiece and performing the main cleaning, the cleaning liquid used for the pre-cleaning and the cleaning liquid used for the main cleaning are separated, and the cleaning liquid used for the pre-cleaning And a liquid separation means for separating the cleaning liquid used in the main cleaning in order to circulate and reuse it in the cleaning section.

  According to this configuration, a workpiece to which a high-concentration chemical solution is attached immediately after the chemical-solution treatment is first subjected to pre-cleaning to replace and remove the attached high-concentration chemical solution. Then, only the cleaning liquid whose pollution degree has increased as a result of the pre-cleaning is discarded. On the other hand, since the main cleaning is performed on the workpiece having the chemical solution lowered as a result of the pre-cleaning, the chemical solution content of the chemical solution after the main cleaning decreases. As a result, the cleaning liquid used for the main cleaning can be reused for cleaning. That is, by separating and discarding the cleaning liquid after the pre-cleaning, it is possible to perform two-stage cleaning in the same cleaning section while minimizing the amount of cleaning liquid discarded, and to reduce the processing in the subsequent cleaning process. Can do. Further, there is no need to provide a new process, and the equipment can be prevented from being enlarged.

  The pre-cleaning means can be performed in a spray form, and the main cleaning means can be performed in a spray or shower form. Thus, pre-cleaning, main cleaning, and separation can be easily performed by switching the timing of spraying or showering.

  Further, the liquid separation means can be a switching valve that switches a drain path between the cleaning liquid after the pre-cleaning and the cleaning liquid after the main cleaning.

  In this case, the cleaning liquid after the pre-cleaning stored in the lower part of the same cleaning section and the cleaning liquid after the main cleaning can be easily separated.

  Further, it is preferable that the switching valve performs the drainage path switching operation after a predetermined time has elapsed after completion of the pre-cleaning.

  In this case, the cleaning liquid used for the pre-cleaning can be reliably separated.

  In addition, it is desirable that the amount of the cleaning liquid used in the pre-cleaning and the amount of the cleaning liquid in the subsequent cleaning unit to be supplied back to the cleaning unit are substantially the same.

  In this case, it is possible to maintain the degree of contamination of the cleaning liquid in the cleaning section after the chemical liquid treatment at a predetermined value, and the cleaning performance of the cleaning section can be easily maintained.

  According to this invention, in the tact-type workpiece surface treatment apparatus, pre-cleaning and main cleaning are performed in the cleaning section after the chemical solution processing. By performing the pre-cleaning, it is possible to reduce the load of the main cleaning and the subsequent cleaning and perform an efficient cleaning process. Further, since only the cleaning liquid having a high chemical concentration after the pre-cleaning is discharged, the discharge amount of the cleaning liquid can be reduced, that is, the supply amount of fresh water can be reduced. In addition, by performing the pre-cleaning and the main cleaning separately, it is possible to use the same cleaning unit, and it is possible to perform a good cleaning process without increasing the equipment scale.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments (hereinafter referred to as embodiments) for carrying out the invention will be described with reference to the drawings.

  FIG. 1 is a conceptual diagram of a configuration of a workpiece surface treatment apparatus 10 according to the present embodiment. In the present embodiment, the workpiece is a part that is formed by, for example, pressing or machining and requires a coating process, and pre-processing for the coating process, for example, an oil or fat substance (press processing or Degreasing that removes machine oil and rust preventive oil adhering during machining, etc., machine parts that require chemical conversion to prevent corrosion of the workpiece and increase the adhesion of the paint in the painting process, etc. As long as it is a painted part that requires pretreatment such as treatment or chemical conversion treatment, the material, shape, etc. are arbitrary.

  The workpiece 12 to be processed is suspended on an overhead type conveyor 14 and can move intermittently through a plurality of processing steps. That is, as shown by the arrows in FIG. 1, the workpiece 12 can move between the processing steps along the path of the conveyor 14 and stop and move up and down at a position immediately above each processing step. In the case of FIG. 1, as an example, a three-stage cleaning unit including a first cleaning unit 18, a second cleaning unit 20, and a third cleaning unit 22 is disposed in the subsequent stage of the chemical conversion processing unit (chemical solution processing unit) 16. Then, the workpiece 12 is lowered to the treatment tanks of the chemical conversion processing unit 16, the first cleaning unit 18, the second cleaning unit 20, and the third cleaning unit 22 by an elevating mechanism (not shown) of the conveyor 14, and predetermined processing is performed therein. Is done. For example, in the case of the chemical conversion treatment unit 16, the chemical conversion treatment agent is filled in the treatment tank as a chemical solution, and a rust prevention film or the like is formed on the surface of the work 12 by immersing the work 12 for a predetermined time. Moreover, in the 1st washing | cleaning part 18, after the workpiece | work 12 descend | falls in the hollow booth 18a, washing | cleaning by a washing water supply apparatus is performed, and the washing | cleaning liquid dripped after washing | cleaning is sent to the storage tank 24 provided separately. In the 2nd washing | cleaning part 20 and the 3rd washing | cleaning part 22, the washing | cleaning liquid (for example, water) is satisfy | filled in the tank similarly to the chemical conversion treatment part 16, and the workpiece | work 12 is immersed for a predetermined time, or it vibrates in arbitrary directions in a washing | cleaning liquid. As a result, the liquid adhering to the surface of the workpiece 12 (chemical solution or cleaning liquid used in the previous cleaning) is replaced and removed.

  Note that the number of stages of the cleaning unit is arbitrary, and the number of stages may be further increased as necessary, or may be two. For example, when the chemical solution processing unit is a degreasing process, the cleaning unit is usually configured in two stages.

  By the way, when washing | cleaning the workpiece | work 12 which performed the chemical | medical solution process, a chemical | medical solution is sequentially taken out to each washing | cleaning part. As a result, the chemical concentrations of the storage tank 24, the second cleaning unit 20, and the third cleaning unit 22 increase, and the cleaning efficiency decreases. Therefore, in the present embodiment, fresh water is constantly supplied from the fresh water supply unit 26 to the third cleaning unit 22 at the last stage. Here, the fresh water is a cleaning liquid (for example, unused water) having a predetermined purity or higher. The third cleaning unit 22 is formed with a slot 22a so as to overflow when the cleaning liquid in the tank exceeds a predetermined amount due to the supply of fresh water. Then, the overflowing cleaning liquid is supplied back to the previous stage, that is, the second cleaning section 20. Similarly, a slot 20a is formed in the second cleaning unit 20, and the cleaning liquid overflowed by the return supply from the third cleaning unit 22 is returned to the storage tank 24 connected to the first cleaning unit 18 through the slot 20a. It comes to be supplied. In addition, since the predetermined amount of washing | cleaning liquid used by the pre-cleaning mentioned later is discharged | emitted from the storage tank 24 of the 1st washing | cleaning part 18, the storage tank 24 does not overflow. However, if for some reason the amount of cleaning liquid supplied from the second cleaning unit 20 to the storage tank 24 becomes larger than the amount taken out of the storage tank 24 for use in pre-cleaning, the cleaning liquid is stored in the storage tank 24. Will overflow unintentionally. Therefore, the storage tank 24 is also provided with a slot similar to the slot 20a of the second cleaning unit 20 so that when the cleaning liquid in the storage tank 24 exceeds a predetermined amount, the overflow can be reliably guided to the waste water treatment path. It is desirable.

  In this way, by supplying fresh water to the last-stage cleaning unit and sequentially supplying the overflowed cleaning liquid back to the previous stage side, the cleaning liquid in the cleaning unit that has received the supply back is diluted with a cleaning liquid closer to fresh water. Therefore, the concentration is maintained below a predetermined concentration.

  On the other hand, as for the 1st washing | cleaning part 18, two types of washing | cleaning liquid supply apparatuses are arrange | positioned inside the hollow booth 18a. One is a pre-cleaning spray nozzle 28 for supplying the cleaning liquid from the storage tank 24 to the work 12 immediately after being put into the hollow booth 18a, and the other is the work 12 after completion of the pre-cleaning by the spray nozzle 28. This is a main cleaning shower nozzle 30 for supplying the cleaning liquid from the storage tank 24 again. The supply of the cleaning liquid to the spray nozzle 28 is performed by opening / closing control of the valve MV-1, and the supply of the cleaning liquid to the shower nozzle 30 is performed by opening / closing control of the valve MV-2.

  The bottom surface of the hollow booth 18a is inclined in one direction as shown in FIG. 1, so that the cleaning liquid used in the pre-cleaning by the spray nozzle 28 or the main cleaning by the shower nozzle 30 flows into the pipe 32 naturally. It has become. The used washing water that has flowed into the pipe 32 is returned to the storage tank 24 by the opening / closing control of the valve MV-3, and is recycled for waste water treatment by the opening / closing control of the valve MV-4. And are separated.

  That is, the pre-cleaning cleaning liquid with a large chemical content, in which the chemical liquid (predetermined concentration) adhered to the workpiece 12 immediately after the chemical processing (chemical conversion processing in FIG. 1) is performed, is passed through the valve MV-4. The cleaning liquid used for the main cleaning for cleaning the work 12 after the pre-cleaning is completed and the chemical liquid has dropped to some extent is sent to the storage tank 24 via the valve MV-3.

  In the present embodiment, pre-cleaning does not mean that the workpiece 12 is completely cleaned with a large amount of cleaning liquid, but a small amount of cleaning liquid supplied from the spray nozzle 28 flows down the surface of the workpiece 12. It means the degree to pass through. In this case, the amount of the cleaning liquid used for the pre-cleaning is extremely small, and the amount of the used cleaning liquid sent to the waste water treatment (disposal) via the valve MV-4 is small. Cleaning of the work 12 is performed by replacing the liquid that has been adhered to the surface of the work 12 with the cleaning liquid that flows down. Therefore, the chemical liquid that adheres to the work 12 is diluted by the pre-cleaning, and substantially. The cleaning load in the subsequent main cleaning (increase in the contamination concentration of the cleaning liquid) can be greatly suppressed. In addition, since the cleaning liquid used in the pre-cleaning is discharged and only the cleaning liquid used in the main cleaning is returned to the storage tank 24, the chemical solution at the stock solution level is not returned to the storage tank 24, so that the cleaning liquid in the storage tank 24 is contaminated. The concentration does not extremely increase, and the cleaning solution in the storage tank 24 is diluted with a cleaning solution with low chemical contamination returned and supplied from the second cleaning unit 20, so the concentration of the cleaning solution in the storage tank 24 is reduced. It can be easily maintained below a predetermined value. Further, the amount of the cleaning liquid used in the pre-cleaning varies depending on the surface area of the workpiece 12, but by substantially matching the amount of the cleaning liquid used in the pre-cleaning with the amount of fresh water supplied by the new water supply unit 26, It is possible to easily manage the concentration of the entire cleaning unit.

  Hereinafter, the operation of the first cleaning unit 18 will be described with reference to the flowchart of FIG. A control unit (not shown) that performs opening / closing control of each valve MV-1, MV-2, MV-3, MV-4 and transport control of the work 12 by the conveyor 14 includes various sensors (for example, not shown). , A signal from a limit sensor, a photoelectric sensor or the like installed on the conveyor 14 or the lifting device), and monitoring the movement state of the workpiece 12, each valve MV-1, MV-2, MV-3, MV- 4 is used to control the operation timing.

  First, the control unit determines whether or not the workpiece 12 has completed the chemical processing based on the detection result of the sensor provided on the conveyor 14 (S100). When the chemical solution processing is completed, the control unit controls all the valves MV-1, MV-2, MV-3, and MV-4 to be closed as preparations for the cleaning operation in the first cleaning unit 18 (S101). Then, the descent of the workpiece 12 that has moved right above the first cleaning unit 18 is started (S102). Subsequently, the valves MV-1 and MV-4 are controlled to open, and the operation of the pump 34 that pumps up the cleaning liquid in the storage tank 24 is started (S103). At this time, since the valve MV-1 is open, the cleaning liquid is supplied from the spray nozzle 28 toward the workpiece 12, and pre-cleaning is started. As described above, the cleaning solution having a high concentration of the chemical solution that has been replaced by the chemical solution attached to the workpiece 12 immediately after the chemical processing is discharged from the system through the valve MV-4 opened from the inclined bottom surface of the hollow booth 18. If necessary, wastewater treatment is applied and discarded. Further, the control unit starts a pre-cleaning timer that measures the time from the start of pre-cleaning (S104).

  The control unit monitors whether or not the pre-cleaning timer has expired (S105). When the pre-cleaning timer has expired, the control unit stops the operation of the pump 34 and controls the valve MV-1 to be closed. Then, a liquid drain timer is started (S106). As described above, in the pre-cleaning, a small amount of cleaning liquid is sprayed on the work 12 and the chemical liquid adhering to the surface of the work 12 is replaced and removed by the cleaning liquid flowing down the surface. May flow and may stop at the lower end of the workpiece 12. Therefore, a liquid draining time is provided for a predetermined time (several seconds to several tens of seconds) after the end of spraying. In addition, it is desirable to promote liquid draining by vibrating the workpiece 12 during the liquid draining. As a result, the cleaning liquid containing a large amount of the chemical liquid used in the pre-cleaning is surely discharged through the valve MV-4.

  The control unit monitors whether or not the liquid drain timer has expired (S107). If the time has expired, the control unit opens the valve MV-3 and closes the valve MV-4 (S108). 32 drainage paths are switched to the storage tank 24 side.

  Subsequently, the control unit controls the opening of the valve MV-2 and restarts the operation of the pump 34 (S109). Thereby, the main cleaning by the shower nozzle 30 is started. The control unit starts the main cleaning timer simultaneously with the start of the main cleaning, and measures the elapsed time of the main cleaning (S110). At this time, since the valve MV-3 is opened and the valve MV-4 is closed, the cleaning liquid after the main cleaning of the workpiece 12 is returned to the storage tank 24 via the valve MV-3 and circulated for cleaning. Reused. As described above, since the chemical solution adhering to the workpiece 12 has already been replaced and diluted by the pre-cleaning solution, even if the cleaning solution is replaced again by the main cleaning, a significant concentration increase due to the cleaning solution does not occur. Therefore, even if the cleaning liquid after the main cleaning is returned to the storage tank 24, it can be sufficiently diluted with the overflowing cleaning liquid with a low degree of chemical contamination that is supplied back from the second cleaning unit 20, and the concentration of the storage tank 24 is below a predetermined value. Can be maintained.

  The control unit monitors the main cleaning timer (S111). When the time is up, the operation of the pump 34 is stopped (S112), the work 12 is raised (S113), and the processing in the first cleaning unit 18 is performed. Is completed, the process returns to step (S100) to prepare for the next work 12 to be put into the first cleaning unit 18.

  As described above, in the present embodiment, the cleaning in the first cleaning unit 18 is separated into the pre-cleaning and the main cleaning, the cleaning liquid used in each cleaning is separated, and only the pre-cleaning liquid with a high chemical content is discarded. The main cleaning liquid whose chemical liquid content has decreased due to the pre-cleaning effect is returned to the storage tank 24 for reuse as the cleaning liquid. Therefore, the amount of cleaning liquid discarded can be reduced, and the cleaning load after the main cleaning can be reduced. As a result, the amount of fresh water supplied can also be reduced.

  In addition, since the two stages of cleaning can be performed in the same cleaning section by switching the supply timing of the cleaning liquid and the discharge path, efficient workpiece cleaning can be performed without increasing the equipment scale. .

  Note that the configuration shown in FIG. 1 and the flowchart shown in FIG. 2 of the present embodiment are only examples, and in the cleaning unit performed immediately after the chemical treatment, switching between pre-cleaning and main cleaning, and separation and pre-cleaning of the pre-cleaning liquid and the main cleaning liquid are performed. As long as only the cleaning liquid can be discharged, the same effects as those of the above-described embodiment can be obtained even if each configuration is arbitrarily changed. Moreover, although the chemical conversion treatment liquid is shown as the chemical liquid in the above-described embodiment, the present configuration can be applied to a degreasing liquid or other surface treatment apparatus that uses a chemical liquid that requires a cleaning process after the surface treatment of the workpiece. Yes, the same effect can be obtained.

It is explanatory drawing explaining the structural concept of the workpiece | work surface treatment apparatus which concerns on embodiment of this invention. It is a flowchart explaining the operation | movement in the 1st washing | cleaning part of the workpiece | work surface treatment apparatus which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Surface treatment apparatus, 12 Workpieces, 14 Conveyor, 16 Chemical conversion processing part (chemical solution processing part), 18 1st washing | cleaning part, 18a Hollow booth, 20 2nd washing | cleaning part, 20a, 22a Slot, 22 3rd washing | cleaning part, 24 Storage Tank, 26 fresh water supply unit, 28 spray nozzle, 30 shower nozzle, 32 piping, 34 pump, MV-1, MV-2, MV3, MV-4 valve.

Claims (5)

A tact-type processing apparatus that intermittently performs surface treatment on a workpiece to be conveyed for each processing step, and a chemical solution processing unit that performs surface treatment on the workpiece with a chemical solution, and a next stage of the chemical solution processing unit In a workpiece surface treatment apparatus including a cleaning unit that is provided afterwards, and a cleaning unit that applies a cleaning liquid to a workpiece after chemical liquid processing and replaces and removes the liquid adhering to the workpiece,
The cleaning section is formed in a plurality of stages, and the last cleaning section is provided with fresh water supply means for supplying fresh water for maintaining the concentration of the cleaning liquid used in the last cleaning section below a predetermined value,
Each cleaning unit has
Return supply means for supplying the cleaning liquid overflowed by the supply of the fresh water back to the previous cleaning unit is provided.
In the cleaning section immediately after the chemical treatment section,
A pre-cleaning means for supplying the cleaning liquid to the workpiece after chemical treatment and pre-cleaning the workpiece;
A main cleaning means for supplying a cleaning liquid to the pre-cleaned workpiece and performing main cleaning;
Liquid separation means for separating the cleaning liquid used in the pre-cleaning from the cleaning liquid used in the pre-cleaning, discharging the cleaning liquid used in the pre-cleaning, and separating the cleaning liquid used in the main cleaning for circulation and reuse in the cleaning section When,
A workpiece surface treatment apparatus comprising: The apparatus of claim 1.
The workpiece surface treatment apparatus, wherein the pre-cleaning means is a spray, and the main-cleaning means is a spray or a shower. The apparatus of claim 1 or claim 2,
The workpiece surface treatment apparatus, wherein the liquid separation means is a switching valve for switching a drain path between the cleaning liquid after the pre-cleaning and the cleaning liquid after the main cleaning. The apparatus of claim 3.
The work surface treatment apparatus according to claim 1, wherein the switching valve performs a drainage path switching operation after a predetermined time has elapsed after completion of the pre-cleaning. The device according to any one of claims 1 to 4,
The workpiece surface treatment apparatus characterized in that the amount of cleaning liquid used in the pre-cleaning and the amount of cleaning liquid in a subsequent cleaning unit supplied back to the cleaning unit substantially coincide with each other.

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