JP5858801B2 - Chemical treatment equipment - Google Patents

Description

  The present invention relates to a chemical conversion treatment apparatus for forming a chemical conversion film on a workpiece.

  A workpiece such as a car body manufactured using a steel plate or the like is subjected to chemical conversion treatment to form a chemically stable chemical conversion coating. By performing such a chemical conversion treatment, it becomes possible to increase the rust preventive power and paint adhesion of the workpiece. Further, as a processing method, a dip method in which a chemical conversion film is formed on the entire workpiece by sinking the workpiece in a processing tank in which a processing solution is stored has become the mainstream. By the way, the sludge derived from the steel material and aluminum material which comprise a workpiece | work will arise in the process liquid which performed the chemical conversion treatment to the workpiece | work. For this reason, a filter such as a tubular filter is connected to the treatment tank, and sludge is removed from the treatment liquid using the filter (see, for example, Patent Document 1).

JP 2003-30679A

  Further, the filter has a backwashing function for backflowing the processing liquid every predetermined time, and the sludge is removed from the filter material to restore the processing capacity of the filter. However, for example, aluminum sludge derived from an aluminum material is sticky and thus easily adheres to the filter material, which causes clogging of the filter material. As described above, depending on the type of sludge captured by the filter, it has been difficult to sufficiently remove the sludge from the filter material even when the processing liquid is caused to flow backward in the filter. In other words, the filter material is clogged and the filter material replacement cycle is accelerated, which increases the maintenance cost of the chemical conversion treatment apparatus.

  The objective of this invention is suppressing the maintenance cost of a chemical conversion treatment apparatus.

Chemical treatment apparatus of the present invention, the processing solution for forming a conversion coating on the workpiece are stored, a plurality of intake treatment tank outlet Ru are formed of different height positions, it is connected to each of the plurality of outlet, the flow A plurality of extraction pipes having a valve for opening and closing a path; and a filter connected to the plurality of extraction pipes and removing sludge from the treatment liquid, and the valve is opened among the plurality of extraction pipes. from the takeout pipe was, the processing liquid to the filter is supplied, it is characterized.

  In the chemical conversion treatment apparatus of the present invention, the filter has a filtration state in which the sludge is trapped in the filter medium by flowing the treatment liquid from one side of the filter medium to the other side, and one of the treatment liquid from the other side of the filter medium. It is operated in a backwashing state in which the sludge is removed from the filter medium.

  The chemical conversion treatment apparatus of the present invention is characterized in that the treatment liquid contains iron sludge and aluminum sludge as the sludge.

  According to the present invention, since a plurality of outlets having different height positions are formed with respect to the processing tank, it is possible to adjust the type and amount of sludge in the processing liquid supplied to the filter. Thereby, clogging of the filter by sludge can be suppressed, and the maintenance cost of the chemical conversion treatment apparatus can be suppressed.

It is the schematic which shows a chemical conversion treatment process. It is the schematic which shows the chemical conversion treatment apparatus which is one embodiment of this invention. (a) is explanatory drawing which shows the filtration state of a filter, (b) is explanatory drawing which shows the backwashing state of a filter. (a)-(c) is an image figure which shows the supply condition of the process liquid with respect to a filter from a chemical conversion treatment tank. (a)-(c) is an image figure which shows the supply condition of the process liquid with respect to a filter from a chemical conversion treatment tank.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a chemical conversion treatment process. Moreover, FIG. 2 is the schematic which shows the chemical conversion treatment apparatus 10 which is one embodiment of this invention. As shown in FIG. 1, a chemical conversion treatment tank (treatment tank) 12 for storing a treatment liquid L is installed in the chemical conversion treatment step in order to perform a chemical conversion treatment on a vehicle body 11 as a workpiece. The treatment liquid L contains a chemical conversion agent such as zinc phosphate. And after performing the degreasing process and the surface adjustment process with respect to the vehicle body 11, the chemical conversion film is formed in the base of the vehicle body 11 by sinking the vehicle body 11 in the chemical conversion treatment tank 12. FIG. Further, as shown in FIG. 2, a filter 15 is connected to the chemical conversion treatment tank 12 through a supply pipe 13 and a return pipe 14 in order to remove sludge from the treatment liquid L in the chemical conversion treatment tank 12. Further, the supply pipe 13 is provided with a filtration pump 16 that pumps the treatment liquid L from the chemical conversion treatment tank 12 to the filter 15. By driving the filtration pump 16, the treatment liquid L can be circulated between the chemical conversion treatment tank 12 and the filter 15.

  As shown in FIG. 2, the filter 15, also called a tubular filter, includes a lower container 20 to which the supply pipe 13 is connected and an upper container 21 to which the return pipe 14 is connected. A cylindrical filter material (filter material) 23 with a bottom is attached to a partition plate 22 provided between the lower container 20 and the upper container 21. Further, a drain tank 25 is connected to the lower container 20 via a drain pipe 24, and an air pressure source 27 is connected to the upper container 21 via an air pipe 26. Further, the supply pipe 13 is provided with a valve V1, the return pipe 14 is provided with a valve V2, the air pipe 26 is provided with a valve V3, and the drain pipe 24 is provided with a valve V4. And it becomes possible to control the filter 15 to the filtration state mentioned later by opening valve | bulb V1, V2 and closing valve | bulb V3, V4. On the other hand, by closing the valves V1 and V2 and opening the valves V3 and V4, it is possible to control the filter 15 to a backwash state described later. In addition, when operating the filter 15 in a filtration state, the filtration pump 16 is driven, while when operating the filter 15 in a backwash state, the filtration pump 16 is stopped.

  Here, FIG. 3A is an explanatory view showing the filtering state of the filter 15, and FIG. 3B is an explanatory view showing the backwashing state of the filter 15. 3A and 3B show a simplified filter 15. As indicated by the white arrow in FIG. 3A, when the filter 15 is controlled to the filtration state, the processing liquid L is guided from the supply pipe 13 through the filter 15 to the return pipe 14. That is, since the processing liquid L flows from the lower container 20 side (one side) of the filter material 23 to the upper container 21 side (the other side), the sludge S in the processing liquid is added to the lower container 20 side of the filter material 23. It becomes possible to capture. The processing liquid L filtered through the filter material 23 is returned to the chemical conversion treatment tank 12 from the return pipe 14.

  On the other hand, as shown by the white arrow in FIG. 3B, when the filter 15 is controlled to be backwashed, compressed air is supplied from the air pipe 26 into the upper container 21 of the filter 15. . In this way, by supplying the compressed air to the upper container 21, the processing liquid L in the upper container 21 is reversely directed from the upper container 21 side (the other side) to the lower container 20 side (the one side) of the filter material 23. Therefore, the sludge S can be removed from the filter material 23. The sludge S removed from the filter material 23 is guided to the drain tank 25 through the drain pipe 24 together with the back-flowing treatment liquid L, and then processed by the Exceller filter 32 described later.

  As shown in FIG. 2, an exceler filter 32 is connected to the drain tank 25 via a sludge pipe 30 and a common pipe 31. The exceler filter 32 includes a case 35 constituted by an upper case 33 and a lower case 34. A common pipe 31 is connected to the upper case 33, a return pipe 36 is connected to the lower case 34, and a cylinder mechanism 37 is connected to the upper case 33. A roll-shaped filter paper 38 is guided between the upper case 33 and the lower case 34 of the exceler filter 32. Further, an air pipe 39 branched from the air pressure source 27 is connected to the common pipe 31. Further, the sludge pipe 30 is provided with a sludge pump 40 and a valve V5, the return pipe 36 is provided with a valve V6, and the air pipe 26 is provided with a valve V7.

  When a predetermined amount of the processing liquid L accumulates in the drain tank 25, the cylinder mechanism 37 is operated to raise the lower case 34, and the upper case 33 and the lower case 34 are sealed. Then, the valves V5 and V6 are opened and the valve V7 is closed, and the sludge pump 40 is driven. As a result, the processing liquid L containing sludge flows from the upper case 33 toward the lower case 34, and the sludge is stacked on the filter paper 38 in the case 35. Thereafter, the valves V6 and V7 are opened, the valve V5 is closed, and the sludge pump 40 is stopped. Thereby, since the compressed air is supplied from the upper case 33 toward the lower case 34, the treatment liquid L remaining in the case 35 is pushed into the return pipe 36, and dewatered sludge remains on the filter paper 38. . When the lower case 34 is lowered by the cylinder mechanism 37 and the lower case 34 is separated from the upper case 33, the sludge S is peeled off from the filter paper 38 by a scraper or the like while winding the filter paper 38, and the peeled sludge S is collected in the collection box. 41 is collected. Note that the return pipe 36 of the exceler filter 32 is connected to the chemical conversion treatment tank 12, and the treatment liquid L discharged from the case 35 is returned to the chemical conversion treatment tank 12.

  Such a chemical conversion treatment apparatus 10 is provided with a control panel 42 constituted by a microcomputer or the like, and in response to a command signal from the control panel 42, the valves V1 to V7, the filtration pump 16, the sludge described above. The pump 40, the cylinder mechanism 37, etc. are controlled. That is, the operating states of the filter 15 and the exceler filter 32 are automatically controlled by a command signal from the control panel 42. In the chemical conversion treatment apparatus 10 shown in the figure, the filter 15 is switched to the backwashing state every predetermined time while continuously operating the filter 15 in the filtering state by a command signal from the control panel 42, but is not limited thereto. There is nothing. For example, when a decrease in the flow rate of the processing liquid L passing through the filter material 23 or an increase in pressure in the lower container 20 is detected, clogging of the filter material 23 is estimated. May be switched to the backwash state.

  As described above, the sludge in the processing liquid is captured by the filter 15 that is in the filtration state, and then is guided to the drain tank 25 by switching the filter 15 to the backwash state, and finally the exceler filter. 32. Generally, the vehicle body 11 is formed using a steel material, but depending on the vehicle model, a front hood, a trunk lid, or the like may be formed using an aluminum material. For this reason, not only the iron sludge Sf derived from the steel material but also the aluminum sludge Sa derived from the aluminum material is generated in the treatment liquid L for forming the chemical conversion film on the vehicle body 11. Since this aluminum sludge Sa is sticky, it is easy to adhere to the filter material 23, which has been a factor in speeding up the replacement cycle of the filter material 23. Therefore, the present inventor has conducted intensive research to solve the problem that the aluminum sludge Sa adheres to the filter material 23, and as a result, the aluminum sludge Sa and the iron sludge Sf are mixed within a predetermined ratio range and the filter 15 is mixed. It has been found that it is important to prevent the aluminum sludge Sa from sticking to the filter material 23.

  Therefore, in order to supply the treatment liquid L to the filter 15 at an appropriate sludge ratio without being affected by the ratio of aluminum sludge Sa and iron sludge Sf in the chemical conversion treatment tank 12 (hereinafter referred to as sludge ratio), FIG. As shown in 2, the chemical conversion treatment tank 12 constituting the chemical conversion treatment apparatus 10 of the present invention is formed with three outlets 51 to 53 having different height positions. Furthermore, a first extraction pipe 54 having a valve V8 is connected to the lower first outlet 51, and a second extraction pipe 55 having a valve V9 is connected to the second outlet 52 at the center. A third extraction pipe 56 having a valve V <b> 10 is connected to the third outlet 53. These extraction pipes 54 to 56 are collectively connected to the supply pipe 13 described above, and the processing liquid L is taken out from different depths in the chemical conversion treatment tank 12 by controlling the valves V8 to V10. Is possible. That is, the processing liquid L can be taken out from the lower part of the chemical conversion treatment tank 12 by opening the valve V8 of the first extraction pipe 54. Further, by opening the valve V <b> 9 of the second extraction pipe 55, it is possible to take out the processing liquid L from the central part of the chemical conversion treatment tank 12. Furthermore, the processing liquid L can be taken out from the upper part of the chemical conversion treatment tank 12 by opening the valve V <b> 10 of the third extraction pipe 56.

  Here, FIGS. 4A to 4C are image diagrams showing the supply status of the treatment liquid L from the chemical conversion treatment tank 12 to the filter 15. In addition, the process liquid L of the same sludge ratio is stored in the chemical conversion treatment tank 12 shown to Fig.4 (a)-(c). In FIG. 4, aluminum sludge Sa is indicated by a white circle, and iron sludge Sf is indicated by a black circle. As shown in FIGS. 4A to 4C, the aluminum sludge Sa has a specific gravity close to that of water, and therefore exists in a state of being almost uniformly dispersed in the chemical conversion treatment tank 12. On the other hand, the iron sludge Sf has a larger specific gravity than water, and therefore is present in a state of being deposited in the lower part of the chemical conversion treatment tank 12. That is, when the processing liquid L is taken out from the lower first outlet 51, the processing liquid supplied to the filter 15 contains a large amount of iron sludge Sf, while the processing liquid is supplied from the upper third outlet 53. When L is taken out, a large amount of aluminum sludge Sa is contained in the processing liquid supplied to the filter 15. In this way, by forming the three outlets 51 to 53 having different height positions with respect to the chemical conversion treatment tank 12, it is possible to freely adjust the sludge ratio in the treatment liquid supplied to the filter 15. Become.

  Next, FIGS. 5A to 5C are image diagrams showing the supply status of the processing liquid L from the chemical conversion treatment tank 12 to the filter 15. In addition, the process liquid L of a different sludge ratio is stored in each chemical conversion treatment tank 12 shown by Fig.5 (a)-(c). That is, the state in which the aluminum sludge Sa in the treatment liquid is decreased and the iron sludge Sf is increased is shown in the order of FIG. 5 (a), FIG. 5 (b), and FIG. 5 (c). Further, in FIG. 5, similarly to FIG. 4, aluminum sludge Sa is indicated by a white circle, and iron sludge Sf is indicated by a black circle. As shown in FIG. 5 (a), when the production ratio of the vehicle body 11 provided with aluminum parts is high, that is, when there is a large amount of aluminum sludge Sa in the treatment liquid, the sludge ratio of the treatment liquid L supplied to the filter 15 is obtained. In order to keep in the predetermined range, it is necessary to increase the content of iron sludge Sf. Thus, when there is much aluminum sludge Sa in a processing liquid, the sludge ratio of the processing liquid L is adjusted to the predetermined range by taking out the processing liquid L containing a lot of iron sludge Sf from the lower first outlet 51. It becomes possible to do.

  On the other hand, as shown in FIG. 5C, when the production ratio of the vehicle body 11 having aluminum parts is low, that is, when the amount of aluminum sludge Sa in the treatment liquid is small, the treatment liquid L supplied to the filter 15 is reduced. In order to keep the sludge ratio within a predetermined range, it is necessary to reduce the content of iron sludge Sf. As described above, when the amount of aluminum sludge Sa in the processing liquid is small, the sludge ratio of the processing liquid L is adjusted to a predetermined range by taking out the processing liquid L containing a small amount of iron sludge Sf from the upper third outlet 53. It becomes possible to do. As shown in FIG. 5B, when there is less aluminum sludge Sa than in the state shown in FIG. 5A and more aluminum sludge Sa than in the state shown in FIG. By removing the processing liquid L from the two outlets 52, the sludge ratio of the processing liquid L can be adjusted to a predetermined range.

  As described above, since the plurality of outlets 51 to 53 having different height positions are formed with respect to the chemical conversion treatment tank 12, the chemical conversion treatment tank 12 according to the production status (vehicle model ratio) of the vehicle body 11. Even if the sludge ratio inside varies, it becomes possible to adjust the sludge ratio in the processing liquid supplied to the filter 15 within a predetermined range. As a result, the iron sludge Sf can be reliably mixed into the processing liquid L supplied to the filter 15, and the adhesion of the aluminum sludge Sa to the filter material 23 can be suppressed. Therefore, by controlling the filter 15 in the backwashing state, the filter material 23 can be sufficiently washed, so that the replacement cycle of the filter material 23 can be extended and the maintenance cost of the filter 15 can be suppressed. Is possible.

  As shown in FIG. 2, a drain tank 61 is connected to the lower part of the chemical conversion treatment tank 12 via a drain pipe 60. Thereby, when a lot of iron sludge Sf is deposited in the lower part of the chemical conversion treatment tank 12, the iron sludge Sf can be discharged from the chemical conversion treatment tank 12 to the drain tank 61 by opening the valve V <b> 11 of the drain pipe 60. It is possible.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above description, any one of the three outlets 51 to 53 is opened and the processing liquid L is taken out. However, the present invention is not limited to this, and two or more outlets 51 to 53 can be simultaneously used. The processing liquid L may be taken out. For example, the processing liquid L may be taken out simultaneously from both the first outlet 51 and the second outlet 52 by adjusting the opening degree of the valves V8 and V9 to 50%. In this way, by removing the processing liquid L from the two or more outlets 51 to 53, the sludge ratio in the processing liquid can be further finely adjusted. In this case, for example, a ball valve provided with a spherical valve body can be used as the valves V8 to V10 provided in each extraction pipe, but other types of valves capable of adjusting the flow rate are used. May be used.

  Moreover, in the above-mentioned description, although the three outlets 51-53 are formed in the chemical conversion treatment tank 12, it is not restricted to this, The two outlets 51-53 may be formed, and four The above outlets 51 to 53 may be formed. Moreover, in the case of illustration, although the height position is changed to the side surface of the chemical conversion treatment tank 12 and the outlets 51 to 53 are opened, it is not limited to this. For example, a plurality of water intake pipes whose end portions function as outlets may be attached to the chemical conversion treatment tank 12 to provide a plurality of outlets with different height positions with respect to the chemical conversion treatment tank 12. Further, the valves V8 to V10 provided in the extraction pipe may be manually opened and closed by an operator, or may be automatically opened and closed according to a command signal from the control panel 42. When the valves V8 to V10 are automatically opened and closed by the control panel 42, command signals for the valves V8 to V10 are set based on production instruction information received by the control panel 42 and the like.

  In the above description, a tubular filter is provided as the filter 15. However, the present invention is not limited to this, and it goes without saying that another type of filter 15 may be used. In the above description, the car body 11 of the automobile is used as a work. However, the present invention is not limited to this, and a chemical conversion process may be performed on another work. Furthermore, since the vehicle body 11 composed of a steel material or an aluminum material is subjected to chemical conversion treatment, aluminum sludge Sa and iron sludge Sf are cited as sludges, but the present invention is not limited thereto. For example, in the case where a plurality of sludges having different specific gravities are generated in the treatment liquid, and mixing different sludges and supplying them to the filter 15 is important in suppressing sludge sticking to the filter material 23, The present invention can be effectively applied.

10 Chemical conversion treatment device 11 Body (work)
12 Chemical conversion treatment tank (treatment tank)
15 Filter 23 Filter material (filter material)
51 1st exit (exit)
52 Second Exit (Exit)
53 Third Exit (Exit)
L Treatment liquid S Sludge Sa Aluminum sludge (sludge)
Sb Iron sludge (sludge)

Claims (3)

Treatment liquid for forming a conversion coating on the workpiece are stored, a processing tank in which a plurality of outlet is Ru are formed of different height positions,
A plurality of extraction pipes connected to each of the plurality of outlets and provided with valves for opening and closing the flow path;
A filter connected to the plurality of extraction pipes to remove sludge from the treatment liquid ;
Have
Chemical conversion treatment device from said valve among a plurality of takeout pipe is opened the takeout pipe, said processing liquid to the filter is supplied, characterized in that. The chemical conversion treatment apparatus according to claim 1,
The filter is configured to flow the treatment liquid from one side of the filter medium to the other side to capture the sludge on the filter medium, and to flow the treatment liquid from the other side of the filter medium to the one side to remove the sludge from the filter medium. A chemical conversion treatment apparatus that operates in a backwashing state to remove sludge. The chemical conversion treatment apparatus according to claim 1 or 2,
The chemical treatment apparatus, wherein the treatment liquid contains iron sludge and aluminum sludge as the sludge.

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