JP6851522B1 - Surface treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface treatment facility in which the flow velocity of a treatment liquid in a treatment tank is made uniform and turbulence is unlikely to occur. SOLUTION: In a surface treatment facility in which an object to be treated is immersed in a treatment liquid L of a treatment tank for surface treatment, the treatment tank is a first stream through which the object to be treated passes and the treatment liquid L flows in one direction. The road portion 23 and the second flow path portion 24 through which the treatment liquid L flows in the direction opposite to the flow of the treatment liquid L in the first flow path portion 23 are provided, and the first flow path portion 23 and the second flow path portion 24 A partition plate 3 is provided between the two, and the downstream end of the first flow path 23 and the upstream end of the second flow path 24 communicate with each other, and the upstream end of the first flow path 23. The U-turn portion 27 in which the portion and the downstream end portion of the second flow path portion 24 reverse the flow direction of the treatment liquid L of the second flow path portion 24 in the flow direction of the treatment liquid L of the first flow path portion 23. A rectifying plate 4 is provided in the U-turn portion 27 so as to communicate with the first flow path portion 23 and extend along the flow direction of the processing liquid L in the first flow path portion 23. [Selection diagram] Fig. 1

Description

The present invention relates to a surface treatment facility for surface treatment by immersing an object to be treated in a treatment liquid in a treatment tank.

Examples of the conventional surface treatment equipment include electrodeposition coating equipment as shown in FIGS. 16 and 17. In the electrodeposition coating equipment, a plurality of ejector nozzles for ejecting paint liquid are arranged on both side walls and the bottom of the electrodeposition tank (an example of a treatment tank), and the upper layer and the lower layer of the paint liquid (an example of a treatment liquid) are arranged. By setting the flow direction in the opposite direction, the paint liquid is circulated throughout the electrodeposition tank.

Japanese Unexamined Patent Publication No. 7-18494

In the conventional electrodeposition equipment, as shown in FIG. 16, since the flow of the coating liquid flowing near the central portion of the electrodeposition tank is weak, stagnation and turbulence due to the reverse flow are likely to occur.
That is, the flow velocity of the coating liquid tends to vary, and in particular, the smoothness of the coating film surface of the object to be coated that passes near the central portion of the electrodeposition tank where the flow velocity is slow is lowered. Further, there is a problem that the turbulent flow causes sedimentation dust (metal powder, coarsened paint particles, etc.) to be rolled up from the bottom of the electrodeposition tank and adheres to the object to be coated.
Therefore, an object of the present invention is to provide a surface treatment facility in which the flow velocity of the treatment liquid in the treatment tank is made uniform and turbulence is unlikely to occur.

The feature of the surface treatment equipment of the present invention is in the surface treatment equipment in which the object to be treated is immersed in the treatment liquid of the treatment tank to perform surface treatment.
In the treatment tank, a first flow path portion through which the object to be processed passes and the treatment liquid flows in one direction, and a second flow flow in which the treatment liquid flows in the direction opposite to the flow of the treatment liquid in the first flow path portion. Equipped with a roadside
A partition plate is provided between the first flow path portion and the second flow path portion.
The downstream end of the first flow path and the upstream end of the second flow path communicate with each other.
The upstream end of the first flow path and the downstream end of the second flow path allow the treatment liquid of the first flow path to flow in the direction in which the treatment liquid of the second flow path flows. Communicate through the U-turn part that reverses in the direction,
A straightening vane extending along the flow direction of the processing liquid in the first flow path portion is provided at the U-turn portion.

According to the present invention, the flow of the processing liquid generated in the second flow path portion is inverted via the U-turn portion to become the flow of the first flow path portion, so that the treatment liquid is generated in the entire first flow path portion. The flow is unidirectional, the flow velocity is uniform without stagnation, and no turbulence occurs. Therefore, it is difficult for dust to roll up from the bottom of the treatment tank, and it is possible to reduce the adhesion of dust and the like to the object to be treated.

Further, as in the present invention, by providing the rectifying plate in the U-turn portion, the flow velocity distribution of the treatment liquid near the center portion in the width direction of the treatment tank and the partition plate side becomes more uniform, so that vortices are less likely to occur and the flow velocity becomes higher. Be homogenized.

Further, according to the present invention, by making the flow velocity of the treatment liquid uniform, the relative speed of the treatment liquid flowing around the object to be treated traveling in the tank with respect to the object to be treated is increased as compared with the conventional surface treatment equipment. To do.

In particular, when the treatment liquid is a paint liquid, the pigment component contained in the paint liquid is fine particles of about 0.1 to 10 μm covered with a dispersed resin, but since the specific gravity is large, the flow velocity is low during painting. If there is no agitation or if it is weak, it will settle, resulting in a rough coating finish. However, in the present invention, since the relative speed of the coating liquid with respect to the object to be coated increases, it is easy to secure a flow velocity of the coating liquid above a certain level, and the smoothness of the coating film and the circumstance of the coating liquid are improved. ..

Further, the Joule heat of the coating film precipitation surface is easily diffused and taken away as the flow velocity of the coating liquid is faster. Hydroxide ions and paint particle ions on the deposition surface of the coating film are more likely to diffuse as the flow velocity increases. That is, the coating film thickness tends to depend on the flow rate of the coating liquid, and the faster the flow rate of the coating liquid, the thinner the coating film thickness.

In the present invention, since the relative speed of the coating liquid with respect to the object to be coated increases, the coating film thickness can be reduced. As a result, the excess coating film can be reduced, and the coating cost required for the amount of coating liquid, electric power, and the like can be reduced.

In the present invention, it is preferable that a plurality of the straightening vanes are provided along the width direction of the processing tank.

According to this configuration, the flow velocity distribution of the treatment liquid near the central portion in the width direction of the treatment tank and on the partition plate side becomes more uniform, and vortices are less likely to occur.

In the present invention, it is preferable that the width of the downstream end portion of the second flow path portion is expanded.

According to this configuration, the flow velocity at the downstream end of the second flow path portion decreases, and the reversing force at the U-turn portion becomes weak. As a result, the flow to the vicinity of the central portion in the width direction of the treatment tank is weakened, and vortices are less likely to be generated.

In the present invention, it is preferable that the pressure feeding means for generating the flow of the treatment liquid is provided in the second flow path portion.

According to this configuration, since it is not necessary to provide the pressure feeding means in the first flow path portion, the treatment liquid flows in a more complete unidirectional flow in the entire first flow path portion.

In the present invention, it is preferable that the pumping means is configured to include an ejector nozzle.

According to this configuration, a flow can be generated by ejecting the treatment liquid from the ejector nozzle.

In the present invention, a plurality of the ejector nozzles are arranged in a row in the vertical direction from the vicinity of the liquid surface of the treatment tank to the bottom, and the rows of the ejector nozzles are arranged along the longitudinal direction of the second flow path portion. It is preferable that a plurality of them are provided.

By providing a plurality of rows of ejector nozzles along the longitudinal direction of the second flow path portion as in this configuration, it is possible to secure a constant flow velocity at any depth of the treatment liquid in the treatment tank.

In the present invention, it is preferable that each of the rows of the plurality of ejector nozzles is configured so that the ejection pressure can be adjusted.

According to this configuration, since each of the rows of the plurality of ejector nozzles is configured so that the ejection pressure can be adjusted, it is easy to adjust the magnitude of the flow velocity of the treatment liquid.

In the present invention, it is preferable that the pumping means further includes a propeller type impeller.

According to this configuration, the number of ejector nozzles can be reduced by providing the propeller type impeller, so that the amount of the processing liquid supplied to the ejector nozzles can be reduced.

In the present invention, it is preferable that an accessory tank adjacent to the treatment tank is provided, and the accessory tank communicates with the upper side of the downstream end portion of the first flow path portion.

According to this configuration, a part of the treatment liquid that has reached the downstream end of the first flow path portion flows into the accessory tank, so that floating dust and the like contained in the treatment liquid are collected in the accessory tank. Is removed.

In the present invention, it is preferable that a bottom hopper adjacent to the treatment tank is provided, and the bottom hopper communicates with the lower side of the downstream end portion of the first flow path portion.

According to this configuration, a part of the treatment liquid that has reached the downstream end of the first flow path portion flows into the bottom hopper, so that sedimentary dust and the like contained in the treatment liquid are filtered and collected in the bottom hopper. And removed.

In the present invention, it is preferable that a second bottom hopper adjacent to the processing tank is provided, and the second bottom hopper communicates with the lower side of the U-turn portion.

According to this configuration, a part of the treatment liquid that has reached the downstream end of the second flow path portion flows into the second bottom hopper, so that sedimentable dust and the like contained in the treatment liquid flows into the second bottom hopper. Is collected by filtration and removed.

In the present invention, it is preferable that a retention portion through which the treatment liquid can flow in is provided near the upstream end portion of the second flow path portion.

According to this configuration, for example, dust that has not been removed by the accessory tank or the bottom hopper is also collected and removed by the retention portion.

In the present invention, it is preferable that a sedimentation prevention means is provided near the bottom surface of the first flow path portion.

According to this configuration, it is possible to prevent paint, dust, etc. from settling and accumulating on the bottom surface of the first flow path portion.

It is a schematic plan view of the 1st Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic side sectional view of the 1st Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic plan view of the U-turn part which does not have a rectifying plate. It is a schematic plan view of the U-turn part provided with one straightening vanity plate. It is the schematic plan view of the U-turn part which includes two straightening plates. It is a schematic plan view of the downstream end portion of the 2nd flow path portion whose width is not expanded. It is a schematic plan view of the downstream end portion of the 2nd flow path portion whose width is expanded. It is a schematic plan view of the 2nd Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic side sectional view of the 2nd Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic plan view of the 3rd Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic side sectional view of the 3rd Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic plan view of the 4th Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic side sectional view of the 4th Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic plan view of the 5th Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic side sectional view of the 5th Embodiment of the electrodeposition coating equipment which concerns on this invention. It is a schematic plan view of the conventional electrodeposition coating equipment. It is a schematic side sectional view of the conventional electrodeposition coating equipment.

As an example of the surface treatment equipment according to the present invention, an embodiment of the electrodeposition coating equipment will be described below with reference to the drawings. The solid arrow in each drawing indicates the flow of the paint liquid L (an example of the treatment liquid), and the white arrow pointing to the right of the paper surface indicates the transport direction of the object to be coated.
[First Embodiment]
As shown in FIGS. 1 and 2, the electrodeposition coating equipment 1 in the present embodiment includes an overhead conveyor (not shown), an electrodeposition tank 2 (an example of a treatment tank), an accessory tank 5, a bottom hopper 6, and a paint liquid. A circulation pump P is provided.

The electrodeposition tank 2 in the present embodiment has a box-shaped shape, and the coating liquid L containing the coating film component is stored in the tank.

In the electrodeposition tank 2, two partition plates 3 extending in the longitudinal direction are provided at positions close to each of the side wall portions 20 of the electrodeposition tank 2. Gap is provided between the front end of the partition plate 3 and the front wall portion 21 of the electrodeposition tank 2, and between the rear end of the partition plate 3 and the rear wall portion 22 of the electrodeposition tank 2.

In the electrodeposition tank 2, the paint liquid L flows in the first flow path portion 23 through which the object to be coated passes and the paint liquid L flows in one direction, and in the direction opposite to the flow of the paint liquid L in the first flow path portion 23. It is provided with two second flow path portions 24 for flowing. The first flow path portion 23 and the second flow path portion 24 are partitioned by a partition plate 3.

In-tank electrodes (not shown) are arranged in each of the partition plates 3 in a state of being immersed in the paint liquid L in the tank. Further, a central wall 29 extending in the longitudinal direction of the tank is provided at the central portion in the width direction of the rear wall portion 22.

The first flow path portion 23 has a wider width than the second flow path portion 24, and is configured as a coating area in which an object to be coated is immersed and electrodeposition coating is performed. The electrodeposition tank 2 includes an entry tank portion 25 on the downstream side of the first flow path portion 23, and an exit tank portion 26 on the upstream side of the first flow path portion 23.

As shown in FIG. 1, in the electrodeposition tank 2, the downstream end of the first flow path 23 and the upstream end of the second flow path 24 communicate with each other. Then, the upstream end of the first flow path 23 and the downstream end of the second flow path 24 make the direction in which the paint liquid L of the second flow path 24 flows the paint of the first flow path 23. It communicates via a U-turn portion 27 that reverses in the direction in which the liquid L flows.

The U-turn portion 27 includes a central wall 29 and a straightening vane 4 extending along the flow direction of the coating liquid L in the first flow path portion 23.

The central wall 29 in the U-turn portion 27 prevents the paint liquids L flowing in from the two second flow path portions 24 from colliding with each other in the central portion in the tank width direction and losing velocity energy. It has the function of efficiently making a U-turn of the liquid L.

When there is no straightening vane 4, as shown in FIG. 3, when the paint liquid L flowing out from the second flow path portion 24 is reversed at the U-turn portion 27, the flow velocity near the center portion in the width direction of the electrodeposition tank 2 Therefore, a vortex is likely to be generated on the partition plate 3 side. Therefore, as shown in FIG. 4, by providing the rectifying plate 4 on the U-turn portion 27, the flow velocity distribution of the coating liquid L near the center portion in the width direction of the electrodeposition tank 2 and the partition plate 3 side becomes uniform, and the vortex Is less likely to occur.

As shown in FIG. 5, it is desirable that a plurality of straightening vanes 4 are provided along the width direction of the electrodeposition tank 2 in order to suppress the generation of vortices. In the present embodiment, by providing two straightening vanes 4 for each of the second flow path portions 24, the flow velocity distribution of the coating liquid L in the vicinity of the center portion in the width direction of the electrodeposition tank 2 and on the partition plate 3 side is substantially uniform. It is configured so that the generation of vortices can be almost eliminated.

Further, when a plurality of straightening vanes 4 are installed, the length of each straightening vane 4 on the rear wall portion 22 side should be as long as the straightening vane 4 closer to the center in the width direction of the tank, that is, the straightening vanes 4 and the rear. It is desirable to reduce the gap with the wall portion 22. As the gap between the straightening vane 4 and the rear wall portion 22 is reduced, the flow velocity of the coating liquid L near the center in the width direction of the tank in the first flow path portion 23 can be adjusted to be smaller, so that the outlet flow velocity of the U-turn portion 27 becomes higher. It is made uniform and the occurrence of turbulent flow in the U-turn portion 27 is prevented.

In this embodiment, two straightening vanes 4 having different lengths are used, and the longer straightening vane 4 is arranged on the central portion side in the width direction of the electrodeposition tank 2. However, it is not limited to this configuration. The length and the number of installed straightening vanes 4 may be appropriately changed as long as the configuration can suppress the generation of vortices or prevent the generation of vortices.

Further, as shown in FIG. 6, when the width of the downstream end portion of the second flow path portion 24 is not expanded, the downstream end portion of the second flow path portion 24 (paint liquid in the second flow path portion 24). The flow velocity at (near the exit of L) becomes large, and the reversing force at the U-turn portion 27 becomes strong. As a result, the flow to the vicinity of the central portion in the width direction of the electrodeposition tank 2 becomes strong, and vortices are likely to be generated. Therefore, as shown in FIG. 7, it is desirable that the width of the downstream end portion of the second flow path portion 24 is expanded in order to suppress the generation of vortices (the two-dot chain line portion and the white arrow in FIG. 7 are shown. reference).

As shown in FIGS. 1 and 2, a plurality of pressure feeding means for causing a flow of the coating liquid L are provided in each of the side wall portions 20 of the electrodeposition tank 2 forming a part of the second flow path portion 24. An ejector nozzle 9 is provided.

The ejector nozzles 9 constitute side risers 90 arranged in a row in the vertical direction from the vicinity of the liquid level of the electrodeposition tank 2 to the bottom. A plurality of side risers 90 are provided along the longitudinal direction of the second flow path portion 24.

Each ejector nozzle 9 is tilted inward by a predetermined angle (for example, about 15 °) with respect to the side wall portion 20, and the paint liquid L is applied to the exit tank portion 26 side of the electrodeposition tank 2. It is arranged so that it can be ejected. The purpose of this is to prevent the loss of velocity energy caused by the paint liquid L ejected from the ejector nozzle 9 colliding with the side riser 90 or other support member arranged downstream.

Further, it is desirable that each side riser 90 is configured so that the ejection pressure can be adjusted by providing, for example, a pressure adjusting valve (not shown). This makes it easy to change the flow velocity of the coating liquid L as appropriate.

The accessory tank 5 is provided adjacent to the upper portion of the electrodeposition tank 2 on the entry tank portion 25 side, and communicates with the upper side of the downstream end portion of the first flow path portion 23.

The bottom hopper 6 is provided adjacent to the lower portion of the electrodeposition tank 2 on the entry tank portion 25 side, and communicates with the lower side of the downstream end portion of the first flow path portion 23.

The paint liquid circulation pump P is provided on the outside of the electrodeposition tank 2, and is connected to the accessory tank 5, the bottom hopper 6, and the side riser 90 via a pipe 8.

When the paint liquid circulation pump P is operated, the paint liquid L flowing down from the accessory tank 5 and the bottom hopper 6 is sucked. The sucked paint liquid L is supplied to each side riser 90 after temperature control and filtration treatment are performed as necessary.

The paint liquid L supplied to each side riser 90 is ejected from each ejector nozzle 9 of the side riser 90, and the flow of the paint liquid L in the electrodeposition tank 2 is generated by this jet output.

When the paint liquid L ejected from each ejector nozzle 9 of the side riser 90 flows through the second flow path portion 24 toward the exit tank portion 26 side and reaches the U-turn portion 27, the flow is reversed and the first It flows into the flow path portion 23.

The paint liquid L flowing through the first flow path portion 23 flows in one direction from the exit tank portion 26 side to the entry tank portion 25 side in the entire first flow path portion 23, so that the flow velocity is uniform without staying. And no turbulence occurs.

Further, with respect to the position in the longitudinal direction of the second flow path portion 24 of each side riser 90 and the height position of the ejector nozzle 9 in each side riser 90, the flow velocity unevenness in the depth direction of the coating liquid L does not occur. It is set to the position. Therefore, regarding the flow velocity distribution of the coating liquid L in the first flow path portion 23, the flow velocity unevenness is unlikely to occur not only in the plane direction but also in the depth direction.

Most of the paint liquid L that has reached the downstream end of the first flow path portion 23 flows into the upstream end of the second flow path portion 24 (the inlet of the paint liquid L in the second flow path portion 24). , The flow is unidirectional from the entry 25 side to the exit 26 side. Therefore, in the entire electrodeposition tank 2, one large in-tank circulation system is generated by the first flow path portion 23 and the second flow path portion 24.

Further, a part of the paint liquid L that has reached the downstream end of the first flow path portion 23 overflows together with buoyant dust and the like and flows into the accessory tank 5. The buoyant dust is collected and removed in the attached tank 5.

Further, a part of the coating liquid L that has reached the downstream end of the first flow path portion 23 flows into the bottom hopper 6 together with sedimentary dust and the like. Sedimentable debris is filtered and collected in the bottom hopper 6 and removed.

An object to be coated (an example of an object to be processed) such as an automobile body is conveyed in a suspended form by an overhead conveyor. The object to be coated is immersed in the paint liquid L in the tank at one end of the electrodeposition tank 2 in the longitudinal direction, and is kept immersed in the paint liquid L following the tank. Then, the electrodeposition tank 2 is advanced in the tank toward the exit portion 26 at the other end in the longitudinal direction, and the electrodeposition step is carried out over a predetermined electrodeposition time in the in-tank progress process.

The object to be coated in the electrodeposition step is immersed in the coating liquid in the tank as a whole while being electrically grounded as a counter electrode to the electrode in the tank. That is, in the electrodeposition tank 2, in a state where the object to be coated is immersed in the coating liquid L in the tank, between the electrode in the tank and the object to be coated as the counter electrode through the coating liquid L in the tank. By applying a predetermined potential difference over a predetermined electrodeposition time, the coating film component in the coating liquid L is electrically attracted and fixed to the outer surface and the inner surface of the object to be coated, whereby the outer surface and the outer surface of the object W to be coated and the surface to be coated W are fixed. A coating film is formed on each of the inner surfaces.

The object to be coated, which has reached the discharge tank portion 26 through the electrodeposition step, is pulled up from the paint liquid L in the tank and sent to the subsequent process portion following the discharge tank.

[Second Embodiment]
8 and 9 show a second embodiment of the electrodeposition coating equipment 1.
Regarding this embodiment, a configuration different from that of the first embodiment described above will be mainly described, and the same reference numerals will be given to the same configurations as those of the first embodiment, and some description thereof will be omitted.

The electrodeposition coating equipment 1 according to the present embodiment further includes a second bottom hopper 7 in addition to the configuration of the first embodiment described above. The second bottom hopper 7 is provided adjacent to the lower part of the electrodeposition tank 2 on the exit 26 side, and communicates with the lower side of the upstream end of the first flow path 23.

A part of the paint liquid L that has reached the downstream end of the second flow path portion 24 flows into the second bottom hopper 7 together with sedimentary dust and the like. Sedimentable dust is collected and removed by filtration not only in the bottom hopper 6 but also in the second bottom hopper 7.

When the paint liquid circulation pump P is operated, the paint liquid L flowing down from the accessory tank 5, the bottom hopper 6, and the second bottom hopper 7 is sucked. The sucked paint liquid L is supplied to each side riser 90 after temperature control and filtration treatment are performed as necessary.

[Third Embodiment]
10 and 11 show a third embodiment of the electrodeposition coating equipment 1.
Regarding this embodiment, a configuration different from that of the first embodiment described above will be mainly described, and the same reference numerals will be given to the same configurations as those of the first embodiment, and some description thereof will be omitted.

The electrodeposition coating equipment 1 according to the present embodiment further includes a retention portion 28 in addition to the configuration of the first embodiment described above.

The retention portion 28 is provided on both side wall portions 20 of the electrodeposition tank 2 in the vicinity of the upstream end portion (the inlet of the coating liquid L in the second flow path portion 24) of the second flow path portion 24.

After most of the paint liquid L that has reached the downstream end of the first flow path portion 23 has flowed into the retention portion 28, the upstream end portion of the second flow path portion 24 (paint liquid in the second flow path portion 24). It flows into (the entrance of L). In the retention portion 28, dust and the like that have not been removed by the accessory tank 5 and the bottom hopper 6 are collected and removed.

When the paint liquid circulation pump P is operated, the paint liquid L that has flowed down from the accessory tank 5, the bottom hopper 6, and the retention portion 28 is sucked. The sucked paint liquid L is supplied to each side riser 90 after temperature control and filtration treatment are performed as necessary.

[Fourth Embodiment]
12 and 13 show a third embodiment of the electrodeposition coating equipment 1.
Regarding this embodiment, a configuration different from that of the first embodiment described above will be mainly described, and the same reference numerals will be given to the same configurations as those of the first embodiment, and some description thereof will be omitted.

The electrodeposition coating equipment 1 according to the present embodiment further includes a propeller type impeller 10 in addition to the side riser 90 in the above-described first embodiment as a pressure feeding means for generating a flow of the coating liquid L.

In the present embodiment, a part of the side riser 90 in the first embodiment is replaced with a propeller type impeller 10.

A plurality of propeller-shaped impellers 10 are arranged in a vertical row from the vicinity of the liquid level of the electrodeposition tank 2 to the bottom, and the rows of propeller-shaped impellers 10 are arranged along the longitudinal direction of the second flow path portion 24. Therefore, a plurality of side risers 90 are provided on the downstream side.

In this configuration, the flow of the paint liquid L is generated by the jet output of the side riser 90 and the rotational force of the propeller type impeller 10. That is, since the propeller type impeller 10 is provided, the flow velocity of the coating liquid L can be maintained at the same flow velocity as that of the first embodiment even if the number of side risers 90 is reduced. Further, as the number of side risers 90 is reduced, the amount of the paint liquid L circulated via the paint liquid circulation pump P can be reduced.

As described above, the reference numerals are given for convenience of comparison with the drawings, but the description does not limit the present invention to the configuration of the accompanying drawings. In addition, it goes without saying that it can be carried out in various modes as long as it does not deviate from the gist of the present invention.

[Fifth Embodiment]
14 and 15 show a fifth embodiment of the electrodeposition coating equipment 1.
Regarding this embodiment, a configuration different from that of the first embodiment described above will be mainly described, and the same reference numerals will be given to the same configurations as those of the first embodiment, and some description thereof will be omitted.

The electrodeposition coating equipment 1 according to the present embodiment further includes a paint settling prevention riser 11 (an example of settling prevention means), a switching valve 12, and a bag filter 13.

Sedimentation of paint and dust in the electrodeposition tank 2 can occur to some extent. On the other hand, in the present embodiment, since the flow direction in the first flow path portion 23, which is the coating area, does not wind up, once the paint or dust has settled, it does not resurface, and the coating quality of the object to be coated is improved. There is no effect of.

However, since the flow velocity near the bottom surface of the first flow path portion 23 is slow, there is a risk that paint and dust will accumulate as they are.

In the present embodiment, a plurality of paint settling prevention risers 11 are installed along the partition plate 3 near the bottom surface of the first flow path portion 23 and near the partition plate 3, and the paint is applied from the paint settling prevention riser 11 to the paint settling prevention riser 11. By ejecting the liquid L, it is possible to prevent paint, dust, etc. from settling and accumulating on the bottom surface of the first flow path portion 23.

During the electrodeposition step, the paint settling prevention riser 11 is not used in order to prevent the settling matter such as paint and dust from rolling up in the first flow path portion 23.

On the other hand, when the electrodeposition process is not performed such as on a holiday, the switching valve 12 is periodically switched to supply the paint liquid L to the paint settling prevention riser 11 and eject it. As a result, the sediment is agitated and discharged from the bottom hopper 6 and collected by the bag filter 13.

When the paint settling prevention riser 11 is used, an intermittent operation is performed, and after the settling material is agitated, the switching valve 12 is turned off for a predetermined time to guide the settling material to the bottom hopper 6 by the normal flow of the paint liquid L. To do. By repeating this several times, the sediment is discharged.

[Other Embodiments]
1. 1. The new configurations different from the first embodiment in the above-mentioned second to fifth embodiments may be arbitrarily combined and configured as necessary.
2. The surface treatment equipment according to the present invention is not limited to the electrodeposition coating equipment described above, and can be applied to, for example, a degreasing treatment equipment for removing oil and dust adhering to the surface of a metal member or the like after molding. .. In this case, by immersing the metal member or the like of the object to be treated in the degreasing agent of the degreasing tank, oil and dust adhering to the surface of the member to be treated can be efficiently removed.

The surface treatment equipment of the present invention can be suitably used in the technical field of electrodeposition coating equipment for coating an automobile body or the like, for example.

1 Electrodeposition coating equipment (an example of surface treatment equipment)
2 Electroplated tank (example of processing tank)
20 Side wall 21 Front wall 22 Rear wall 23 1st flow path 24 2nd flow path 25 Entering tank 26 Exiting tank 27 U-turn 28 Retaining part 29 Central wall 3 Partition plate 4 Rectifying plate 5 Attached tank 6 Bottom hopper 7 Second bottom hopper 8 Piping 9 Ejector nozzle (an example of pumping means)
90 Side riser (an example of pumping means)
10 Propeller type impeller (an example of pumping means)
11 Riser for preventing paint settling (an example of settling prevention means)
12 Switching valve 13 Bag filter P Paint liquid circulation pump L Paint liquid (example of treatment liquid)

Claims (13)

In a surface treatment facility where the object to be treated is immersed in the treatment liquid in the treatment tank for surface treatment.
In the treatment tank, a first flow path portion through which the object to be processed passes and the treatment liquid flows in one direction, and a second flow flow in which the treatment liquid flows in the direction opposite to the flow of the treatment liquid in the first flow path portion. Equipped with a roadside
A partition plate is provided between the first flow path portion and the second flow path portion.
The downstream end of the first flow path and the upstream end of the second flow path communicate with each other.
The upstream end of the first flow path and the downstream end of the second flow path allow the treatment liquid of the first flow path to flow in the direction in which the treatment liquid of the second flow path flows. Communicate through the U-turn part that reverses in the direction,
A surface treatment facility characterized in that a rectifying plate extending along the flow direction of the treatment liquid in the first flow path portion is provided in the U-turn portion. The surface treatment equipment according to claim 1, wherein a plurality of the straightening vanes are provided along the width direction of the treatment tank. The surface treatment equipment according to claim 1 or 2, wherein the width of the downstream end portion of the second flow path portion is expanded. The surface treatment equipment according to any one of claims 1 to 3, wherein a pressure feeding means for generating a flow of the treatment liquid is provided in the second flow path portion. The surface treatment equipment according to claim 4, wherein the pumping means is provided with an ejector nozzle. A plurality of the ejector nozzles are arranged in a row in the vertical direction from the vicinity of the liquid surface of the treatment tank to the bottom, and a plurality of rows of the ejector nozzles are provided along the longitudinal direction of the second flow path portion. The surface treatment equipment according to claim 5, wherein the surface treatment equipment is provided. The surface treatment equipment according to claim 6, wherein each of the rows of the plurality of ejector nozzles is configured so that the ejection pressure can be adjusted. The surface treatment equipment according to any one of claims 5 to 7, wherein the pumping means further includes a propeller type impeller. The item according to any one of claims 1 to 8, wherein an accessory tank adjacent to the treatment tank is provided, and the accessory tank communicates with the upper side of the downstream end portion of the first flow path portion. Described surface treatment equipment. Any one of claims 1 to 9, wherein a bottom hopper adjacent to the treatment tank is provided, and the bottom hopper communicates with the lower side of the downstream end portion of the first flow path portion. Surface treatment equipment described in. The surface treatment equipment according to claim 10, further comprising a second bottom hopper adjacent to the treatment tank, wherein the second bottom hopper communicates with the lower side of the U-turn portion. The surface treatment equipment according to any one of claims 1 to 11, wherein a retention portion through which the treatment liquid can flow in is provided near the upstream end portion of the second flow path portion. The surface treatment equipment according to any one of claims 1 to 12, wherein a sedimentation prevention means is provided near the bottom surface of the first flow path portion.

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