JP2018131679A - Workpiece washing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece washing system capable of achieving increased water conservation.SOLUTION: A workpiece washing system 10 includes a plurality of water purifying apparatuses in a purification line 20 successively purifying the wash water used by a first to third workpiece washing apparatuses 11 to 13. Purified wash water is stored in a terminal storage tank 27, while the wash water during purification is stored in an intermediate storage tank 28. The water in the terminal storage tank 27 is reused in the third workpiece washing apparatus 13, while the water in the intermediate storage tank 28 is reused in the first workpiece washing apparatus 11 and also used in the purifying apparatuses (a first and second filter 22 and 24) for maintenance purpose.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work water washing system for washing a work with water.

  2. Description of the Related Art As a conventional work water washing system, a system that saves water by purifying used washing water with a water purifier and reusing it is known (for example, see Patent Document 1).

JP 2009-293079 A (FIGS. 1, 2, 5, 6)

  However, in recent years when the importance of water resources has been questioned, further water saving has been demanded in the conventional work water washing system described above.

  This invention is made | formed in view of the said situation, and aims at provision of the workpiece | work washing system which can aim at water saving conventionally.

  Invention of Claim 1 made | formed in order to achieve the said objective, The workpiece | work water washing apparatus which wash | cleans a workpiece | work, and the water purification line which purify | cleans the washing water used with the said workpiece | work water washing apparatus one by one with a some water purifier, In order to reuse the cleaning water purified in the water purification line, the terminal return path for feeding from the end of the water purification line to the work water washing device, and the cleaning water purified in the middle of the water purification line are stored. Maintenance that supplies cleaning water for the intermediate storage tank to the water purification apparatus as cleaning water for maintenance that restores at least part of the water purification performance by cleaning the water purification apparatus upstream of the intermediate storage tank and the intermediate storage tank And a work water washing system.

  Invention of Claim 2 has two or more said workpiece | work washing apparatuses, and in order to reuse the washing | cleaning water of the workpiece | work washing line which wash | cleans a workpiece | work sequentially with these workpiece washing apparatuses, and to the said workpiece | work washing apparatus A return path on the way, and the terminal return path supplies cleaning water to the workpiece washing apparatus other than the first workpiece washing apparatus of the workpiece washing line, 2. The workpiece washing system according to claim 1, wherein washing water is fed to the workpiece washing device in front of the workpiece washing device to which washing water is fed from a terminal return path.

  In the invention of claim 3, the washing water that has been used in the workpiece washing apparatus to which washing water is fed from the return path is discharged outside the workpiece washing system without being fed to the water purification line. 3. The workpiece washing system according to claim 2, wherein washing water that has been used in the workpiece washing apparatus that is not fed with washing water from the return path is fed to the water purification line to be purified.

  According to a fourth aspect of the present invention, the water purification line is provided with a reverse osmosis treatment device as a water purification device for allowing cleaning water to permeate through a reverse osmosis membrane, and the intermediate storage tank includes the reverse osmosis treatment device. The work water washing system according to any one of claims 1 to 3, wherein washing water that has not permeated through the reverse osmosis membrane is stored.

  A fifth aspect of the present invention is the workpiece washing system according to the fourth aspect, wherein the reverse osmosis treatment device is a filtration device and ultraviolet irradiation means or a combination of a filtration device, ultraviolet irradiation means and activated carbon.

[Invention of Claim 1]
In the workpiece water washing system according to the first aspect, the used washing water that has washed the workpiece with the workpiece washing device is sequentially purified by the plurality of water purification devices of the water purification line. Then, the cleaning water is fed from the end of the water purification line to the work water washing device through the terminal return path and reused. The water purification line is provided with an intermediate storage tank that stores the purified water purified halfway. And the wash water of an intermediate storage tank is used as the wash water for maintenance which wash | cleans a water purifier. Thereby, water resources can be used effectively and water saving can be achieved. In addition, since cleaning water in the middle of purification is used as maintenance cleaning water, maintenance cleaning water does not have an excessive quality compared to the case where cleaning water that has been purified is used as maintenance cleaning water, and the load on the water purification line Can also be suppressed.

[Invention of claim 2]
In the work water washing system according to claim 2, the washing water in the middle of purification is reused by washing the workpiece that has not been washed with water, and the washing water that has been purified is reused by washing the workpiece that has been washed in water. Water resources can be reused efficiently.

[Invention of claim 3]
According to the configuration of the third aspect, it is possible to maintain a good water quality state by replacing a part of the washing water while purifying and reusing the washing water for effective use.

[Inventions of Claims 4 and 5]
In the work water washing system according to claims 4 and 5, conventionally, the washing water that has been discarded without passing through the reverse osmosis membrane in the reverse osmosis treatment apparatus can be effectively used.

The conceptual diagram of the workpiece water washing system which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the workpiece water washing system 10 of this embodiment is provided in the pre-process of the electrodeposition process which performs electrodeposition coating on a workpiece | work, for example. The pre-process of the electrodeposition process includes a preliminary washing process in which the workpiece is washed with water to remove metal powder, lint, etc., a degreasing process in which the workpiece is washed with a detergent to remove oil, and the workpiece is washed with water to obtain a detergent and And a main washing step for removing oil, and the main washing step is performed by the work water washing system 10 according to the present invention.

  This work water washing system 10 has a work water washing line 14 formed by connecting first to third work water washing devices 11, 12, and 13. Then, the work is transported in a state where it is suspended by, for example, a lift-type transport device (not shown), and sequentially passes through the first to third work water-washing devices 11, 12, and 13 and is washed with water.

  The first workpiece washing apparatus 11 includes, for example, a state in which a plurality of cleaning pipes 11P extending vertically are arranged along the workpiece conveyance path. Then, washing water is jetted from a plurality of nozzles (not shown) formed in the washing pipe 11P to the workpiece, the workpiece is washed with water, and the used washing water is collected by the water collecting pan 11A and stored in the storage tank 11B. Is done. In addition, cleaning water is supplied from a water purification line 20 to be described later to the cleaning pipe 11P on the terminal end side in the workpiece conveyance direction among the plurality of cleaning pipes 11P, and the storage tank 11B is connected to the other cleaning pipes 11P. Wash water is supplied by the pump 11C. Furthermore, the wash water overflowed from the storage tank 11B together with the detergent and the oil is drained out of the work water washing system 10 through the drainage channel 11E, and is discarded through, for example, a known water purification treatment.

  Similarly to the first workpiece washing apparatus 11, the third workpiece washing apparatus 13 includes a plurality of washing pipes 13P, a water collection pan 13A, a storage tank 13B, and a pump 13C. Then, the cleaning water from the water purification line 20 is supplied to the cleaning pipe 13P on the terminal side in the workpiece conveyance direction, and the cleaning water of the storage tank 13B is supplied to the other cleaning pipes 13P by the pump 13C.

  The second workpiece water washing apparatus 12 has a washing tank 12A extending in the workpiece conveyance direction. And a workpiece | work passes in the state immersed in the washing water of 12 A of washing tanks. In addition, a cleaning pipe 12P is provided at the end of the second workpiece washing apparatus 12 in the workpiece conveyance direction, similarly to the first and third workpiece washing apparatuses 11 and 13, and the washing pipe 12P includes Washing water in the storage tank 13B of the third workpiece washing apparatus 13 is supplied by a pump 13C. And the workpiece | work pulled out from the washing water of 12 A of washing tanks is wash | cleaned with the washing water ejected from the nozzle of the pipe 12P for washing | cleaning.

  The water purification line 20 purifies the cleaning water overflowing from the washing tank 12A of the second work water washing device 12 together with the detergent and oil, and the above-described washing pipes 11P, 13P of the first and third work water washing devices 11, 13 To supply. For this purpose, the water purification line 20 includes a coagulation treatment device 21, a first filter 22, an AOP treatment device 23, a second filter 24, and a reverse osmosis treatment device 25 as a plurality of water purification devices according to the present invention. Are connected in series.

  The agglomeration processing device 21 includes a raw water tank 21A that receives cleaning water from the cleaning tank 12A of the second workpiece water washing device 12, a first supply device 21C that supplies a ph adjusting agent, and a second supply device 21D that supplies a flocculant. And a third supply device 21E for supplying an oxidant and a mixing pump 21B. Then, the mixing pump 21 </ b> B mixes the cleaning water of the raw water tank 21 </ b> A, the ph adjusting agent, and the flocculant, and feeds them to the first filter 22.

  In addition, as an oxidizing agent, sodium hypochlorite or hydrogen peroxide is mentioned. These oxidizing agents react with ultraviolet rays to generate OH radicals and strongly decompose organic substances.

  The first filter 22 is a membrane filtration device having sand filtration or micron level pores. In the case of sand filtration, for example, sand and gravel having different particle diameters are provided in multiple layers. Then, the organic foreign matter formed by aggregating the detergent and the oil in the washing water supplied from the mixing pump 21 </ b> B is removed by the first filter 22.

  The AOP processing device 23 has a known structure disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2012-187443, Japanese Unexamined Patent Application Publication No. 2014-97472, and the like. Then, the organic foreign matters remaining in the cleaning water that has passed through the first filter 22 are decomposed by the AOP treatment device 23. AOP is an abbreviation for Advanced Oxidation Process (accelerated oxidation method), and in the present invention, it is a combination of an oxidizing agent and ultraviolet rays.

  AOP may be a combination of ozone generation means and ultraviolet irradiation means, or a combination of ozone generation means and hydrogen peroxide. However, ultraviolet irradiation means have lower initial costs and running costs than ozone generation means. The cost can be reduced by combining AOP with an oxidizing agent and ultraviolet rays as in the present invention.

  For example, the second filter 24 is filled with a porous body (for example, activated carbon or ceramics). Then, the substance decomposed from the organic foreign matter by the AOP processing apparatus 23 and the organic foreign matter not decomposed are removed by the second filter 24.

  The reverse osmosis treatment apparatus 25 has a known structure disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-262122. That is, the reverse osmosis treatment device 25 divides the inside of the container 25C into first and second chambers 25A and 25B with a reverse osmosis membrane 25M having a hole several times as large as water molecules. The washing water from the second filter 24 is supplied to 25A. Then, by applying pressure to the washing water in the first chamber 25A, only water molecules (that is, only washing water) move to the second chamber 25B through the reverse osmosis membrane due to the reverse osmotic pressure phenomenon. Further, the wash water in the second chamber 25B is stored in a terminal storage tank 27 provided at the end of the water purification line 20, and is supplied to the cleaning pipe 13P of the third workpiece water washing apparatus 13 by the pump 27C. The In the present embodiment, the flow path for supplying cleaning water from the terminal storage tank 27 to the third workpiece water washing device 13 is the terminal return path 30 according to the present invention.

  A relay tank 26 is provided between the second filter 24 and the reverse osmosis treatment device 25. Then, the wash water that has passed through the second filter 24 is stored in the relay tank 26, and the pump 26P supplies the wash water in the relay tank 26 to the reverse osmosis treatment device 25 through the prefilter 26F. In addition, the washing water in the first chamber 25A in which the concentration of foreign matter is increased by passing only water molecules through the reverse osmosis membrane 25M is returned to the relay tank 26.

  Now, in addition to the relay tank 26, the water purification line 20 is provided with an intermediate storage tank 28 to which a part or most of the washing water is fed from the first room 25A of the reverse osmosis treatment device 25. Then, the washing water in the intermediate storage tank 28 is fed to the washing pipe 11P of the first workpiece washing apparatus 11 by the pump 28C. In the present embodiment, the flow path for supplying the cleaning water from the intermediate storage tank 28 to the first work water washing apparatus 11 is the midway return path 31 according to the present invention.

  Further, the feeding paths 57 and 59 between the AOP processing device 23 and the first and second filters 22 and 24 are connected to the return path 31 on the way by connecting paths 40 and 41, respectively. The communication paths 40, 41, the midway return path 31, and a part of the supply paths 57, 59 constitute a maintenance return path 60 according to the present invention, and the intermediate storage tank 28 through the maintenance return path 60. The first and second filters 22 and 24 are back-washed with the wash water fed from.

  Specifically, a valve 55 is provided on the downstream return path 31 downstream of the communication paths 40 and 41. Further, the supply paths 56 and 57 between the first filter 22 and the aggregation processing device 21 and the AOP processing device 23 are also provided with valves 51A and 54A, respectively. The supply paths 58 and 59 between the AOP processing device 23 and the relay tank 26 are also provided with valves 51B and 54B, respectively. The valves 51A, 51B, 54A, 54B, and 55 are normally held in the open state, and are switched to the closed state when the first and second filters 22 and 24 are washed.

  Further, a branch path 56A extends from the supply path 56 between the first filter 22 and the agglomeration processing device 21 from the downstream side portion of the valve 51A, and the valve 52A is also provided in the branch path 56A. Similarly, a branch path 58A extends from the downstream side of the valve 51B from the upstream feed path 58 of the second filter 24 and the coagulation treatment apparatus 21, and a valve 52B is also provided in the branch path 58A. Yes. Further, the communication paths 40 and 41 are also provided with valves 53A and 53B. The valves 52A, 52B, 53A, and 53B are normally kept in a closed state, and are switched to the open state when the first and second filters 22 and 24 are washed.

  The washing water discharged from the branch paths 56A and 58A is drained out of the workpiece washing system 10, and is discarded through, for example, a known water purification treatment. Further, the above-described valves 51A to 54A, 51B to 54B, and 55 may be opened and closed by a driving source, or may be manually opened and closed.

  The description regarding the structure of the workpiece | work washing system 10 of this embodiment is above. Next, the effect of the workpiece | work washing system 10 is demonstrated. The workpiece that has undergone the degreasing step is washed with the workpiece washing line 14 of the workpiece washing system 10 before being sent to the electrodeposition step.

  In the workpiece washing line 14, most of the detergent and oil adhering to the workpiece are first washed away by the first workpiece washing device 11, and then the workpiece is submerged in the washing water by the second workpiece washing device 12. Then, it is washed with water without being left unwashed, and finally washed with washing water having a high water purity by the third work water washing device 13. Therefore, compared with the 2nd and 3rd workpiece | work washing apparatuses 12 and 13, the washing | cleaning water used with the 1st workpiece | work washing apparatus 11 contains many detergents and oil components. On the other hand, the washing water overflowed in the storage tank 11B of the first workpiece washing apparatus 11 is discharged outside the workpiece washing system 10 without being reused, and overflowed in the washing tank 12A of the second workpiece washing apparatus 12. The washing water is purified by the water purification line 20 and reused. Thus, outside the workpiece water washing system 10 of the present embodiment, it is possible to maintain a good water quality by replacing a part of the washing water while purifying and reusing the washing water for effective use.

  In the water purification line 20, the detergent and oil in the washing water are first aggregated by the aggregating treatment device 21 to form organic foreign matters, and most of the foreign matters are removed by the first filter 22. Next, the organic foreign matter that has passed through the first filter 22 is decomposed by the AOP treatment device 23, the decomposed substance and the organic foreign matter that has not been decomposed are removed by the second filter 24, and finally, Foreign matter slightly remaining in the washing water is removed by the reverse osmosis membrane 25M of the reverse osmosis treatment device 25.

  Further, the cleaning water that has been purified by the water purification line 20 is stored in the terminal storage tank 27, and the cleaning water that is not yet passed through the reverse osmosis membrane 25 </ b> M is stored in the intermediate storage tank 28. Then, the cleaning water in the terminal storage tank 27 is reused in the third workpiece washing apparatus 13, and the cleaning water in the intermediate storage tank 28 is reused in the first workpiece washing apparatus 11. That is, in the workpiece water washing system 10 of the present embodiment, the washing water in the middle of purification is reused for washing the workpiece that has not been washed with water, and the washing water that has been purified is reused by washing the workpiece that has been washed with water. Since it is used, water resources can be reused efficiently. Moreover, conventionally, the wash water that has been discarded by the reverse osmosis treatment apparatus 25 without passing through the reverse osmosis membrane 25M can be effectively used.

  Now, the workpiece water washing system 10 is maintained every predetermined period. At that time, the normally opened valves 51A, 54A, 51B, 54B, and 55 are closed, while the normally closed valves 52A, 53A, 52B, and 53B are opened. Thereby, the backwashing of the first and second filters 22 and 24 using the washing water of the intermediate storage tank 28 is performed.

  Thus, in the workpiece water washing system 10 according to the present embodiment, the washing water in the intermediate storage tank 28 is used as maintenance washing water for washing the water purifier (the first and second filters 22 and 24). Thereby, water resources can be used effectively and water saving can be achieved. In addition, since the cleaning water in the middle of purification is used as maintenance cleaning water, the cleaning water for maintenance does not have an excessive quality as compared with the case where cleaning water after purification is used as maintenance cleaning water. The load can also be suppressed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, both the first and second filters 22 and 24 are backwashed with the washing water of the intermediate storage tank 28. However, one of the first and second filters 22 and 24 is used. It is good also as a structure which backwashes only with the washing water of the intermediate | middle storage tank 28. Further, the cleaning water used in the backwashing was discarded outside the workpiece washing system 10, but the washing water used in the backwashing was re-supplied, for example, by feeding it to the storage tank 11B of the first workpiece washing device 11. May be used.

  (2) The present invention may be applied to a device provided with a water purification device for biodegrading foreign matter in place of the aggregation treatment device 21 of the above embodiment.

  (3) In the above-described embodiment, the cleaning water purified by the water purification line 20 is used for the final cleaning of the workpiece water washing line 14. However, the workpiece water washing device before the last of the workpiece water washing lines purifies the water by the water purification line. The washed water that has been used may be reused, and the purified water taken from the outside of the workpiece washing system may be used in the last workpiece washing device of the workpiece washing line.

DESCRIPTION OF SYMBOLS 10 Work water washing system 11, 12, 13 1st-3rd work water washing apparatus 14 Work water washing line 20 Water purification line 21 Aggregation processing apparatus (water purification apparatus)
22 First filter (water purification device)
23 AOP treatment equipment (water purification equipment)
24 Second filter (water purification device)
25 Reverse osmosis treatment equipment (water purification equipment)
25M reverse osmosis membrane 28 intermediate storage tank 30 terminal return path 31 return path 60 maintenance return path

The agglomeration processing device 21 includes a raw water tank 21A that receives cleaning water from the cleaning tank 12A of the second workpiece water washing device 12, a first supply device 21C that supplies a ph adjusting agent, and a second supply device 21D that supplies a flocculant. And a third supply device 21E for supplying an oxidant and a mixing pump 21B. Then, the mixing pump 21 </ b> B mixes the cleaning water of the raw water tank 21 </ b> A, the ph adjuster, the flocculant, and the oxidizing agent and feeds them to the first filter 22.

The reverse osmosis treatment apparatus 25 has a known structure disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-262122. That is, the reverse osmosis treatment device 25 divides the inside of the container 25C into first and second chambers 25A and 25B with a reverse osmosis membrane 25M having a hole several times as large as water molecules. The washing water from the second filter 24 is supplied to 25A. Then, by applying pressure to the cleaning water in the first chamber 25A, only water molecules (that is, only cleaning water) move to the second chamber 25B through the reverse osmosis membrane 25M due to the reverse osmotic pressure phenomenon. Further, the wash water in the second chamber 25B is stored in a terminal storage tank 27 provided at the end of the water purification line 20, and is supplied to the cleaning pipe 13P of the third workpiece water washing apparatus 13 by the pump 27C. The In the present embodiment, the flow path for supplying cleaning water from the terminal storage tank 27 to the third workpiece water washing device 13 is the terminal return path 30 according to the present invention.

A relay tank 26 is provided between the second filter 24 and the reverse osmosis treatment device 25. Then, the wash water that has passed through the second filter 24 is stored in the relay tank 26, and the pump 26C supplies the wash water in the relay tank 26 to the reverse osmosis treatment device 25 through the prefilter 26F. In addition, the washing water in the first chamber 25A in which the concentration of foreign matter is increased by passing only water molecules through the reverse osmosis membrane 25M is returned to the relay tank 26.

Further, a feeding path 57 between the first filter 22 and the AOP processing device 23 and a feeding path 59 between the second filter 24 and the relay tank 26 are respectively connected to the communication paths 40 and 41. It is connected to the return path 31 on the way. The communication paths 40, 41, the midway return path 31, and a part of the supply paths 57, 59 constitute a maintenance return path 60 according to the present invention, and the intermediate storage tank 28 through the maintenance return path 60. The first and second filters 22 and 24 are back-washed with the wash water fed from.

Further, a branch path 56A extends from the supply path 56 between the first filter 22 and the agglomeration processing device 21 from the downstream side portion of the valve 51A, and the valve 52A is also provided in the branch path 56A. Similarly, a branch path 58A extends from the feed path 58 between the second filter 24 and the AOP processing device 23 from the downstream side of the valve 51B, and the valve 52B is also provided in the branch path 58A. . Further, the communication paths 40 and 41 are also provided with valves 53A and 53B. The valves 52A, 52B, 53A, and 53B are normally kept in a closed state, and are switched to the open state when the first and second filters 22 and 24 are washed.

In the workpiece washing line 14, most of the detergent and oil adhering to the workpiece are first washed away by the first workpiece washing device 11, and then the workpiece is submerged in the washing water by the second workpiece washing device 12. Then, it is washed with water without being left unwashed, and finally washed with washing water having a high water purity by the third work water washing device 13. Therefore, compared with the 2nd and 3rd workpiece | work washing apparatuses 12 and 13, the washing | cleaning water used with the 1st workpiece | work washing apparatus 11 contains many detergents and oil components. On the other hand, the washing water overflowed in the storage tank 11B of the first workpiece washing apparatus 11 is discharged outside the workpiece washing system 10 without being reused, and overflowed in the washing tank 12A of the second workpiece washing apparatus 12. The washing water is purified by the water purification line 20 and reused. In work washing system 10 of the present embodiment, while achieving effective use by reuse purifying washing water, it is possible to maintain the water quality status good instead enters a part of the wash water.

Claims (5)

A workpiece washing device for washing the workpiece,
A water purification line that sequentially purifies the washing water used in the work water washing device with a plurality of water purification devices,
In order to reuse the cleaning water purified in the water purification line, a terminal return path that feeds from the terminal of the water purification line to the workpiece water washing device,
An intermediate storage tank for storing wash water purified to some extent in the water purification line;
A maintenance return path for supplying cleaning water for the intermediate storage tank to the water purification apparatus as cleaning water for maintenance that restores at least part of the water purification performance by washing the water purification apparatus upstream of the intermediate storage tank, Work washing system equipped with. A plurality of the work water washing devices, and a work water washing line for washing the work sequentially with the work water washing devices,
A return path on the way to be fed to the workpiece washing apparatus in order to reuse the washing water of the intermediate storage tank,
The terminal return path supplies cleaning water to the workpiece washing device other than the first workpiece washing device of the workpiece washing line,
2. The workpiece washing system according to claim 1, wherein the halfway return path supplies washing water to the workpiece washing apparatus in front of the workpiece washing apparatus that is supplied with washing water from the terminal return path. Wash water that has been used in the workpiece washing apparatus to which washing water is fed from the return path is discharged outside the workpiece washing system without being fed to the water purification line,
The workpiece washing system according to claim 2, wherein washing water that has been used in the workpiece washing apparatus that is not fed with washing water from the return path is fed to the water purification line and purified. The water purification line is provided with a reverse osmosis treatment device as a water purification device that purifies the washing water through a reverse osmosis membrane.
The workpiece water washing system according to any one of claims 1 to 3, wherein washing water that has not permeated the reverse osmosis membrane by the reverse osmosis treatment device is stored in the intermediate storage tank.   The work rinsing system according to claim 4, wherein the reverse osmosis treatment device is a filtration device and ultraviolet irradiation means or a combination of a filtration device, ultraviolet irradiation means and activated carbon.

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