CN219689866U - Immersion treatment tank device - Google Patents

Abstract

The utility model discloses an immersion treatment tank device, which comprises: -an immersion treatment tank (100), the immersion treatment tank (100) defining an entry zone for a workpiece to be treated into the immersion treatment tank (100) and an exit zone opposite in length to the entry zone for a workpiece to be treated to leave the immersion treatment tank (100), characterized in that the immersion treatment tank device further comprises: a tank liquid circulation module (300) disposed for the immersion treatment tank (100), wherein, when the immersion treatment tank (100) is filled with a tank liquid, a liquid circulation is formed in which at least a part of the upper liquid in the tank liquid leaves the exit region, via the tank liquid circulation module (300); and a tank liquid recovery module (200) configured for the immersion processing tank (100) to recover at least an upper layer of liquid in the tank liquid and supply it back into the immersion processing tank (100) after defoaming to form the liquid flow cycle.

Description

Immersion treatment tank device

Technical Field

The present utility model relates generally to immersion treatment tank arrangements employed in surface chemistry processing lines, and more particularly to immersion treatment tank arrangements employed in phosphorus-free surface chemistry processing lines in whole vehicle painting workshops.

Background

In automobile manufacturing, with the growing penetration of green environmental protection concepts, a treatment process for replacing a phosphorus-containing agent with a phosphorus-free chemical surface treatment agent becomes more and more mainstream in a white Body (BIW) chemical surface treatment production line of a whole automobile coating workshop.

The phosphorus-free chemical surface treatment of white car bodies can generate a layer of nano zirconium salt sediment on the metal surface of the car bodies, so that the treatment is also called zirconium treatment or film treatment. This layer of nano-sized zirconium salt deposit may also be referred to as a nano-zirconated coating. After the nano zirconium coating is generated on the surface of the white car body, the white car body enters an electrophoresis tank of a coating workshop to carry out electrodeposition treatment (also called electrophoresis), so that an electrophoresis organic coating is generated on the white car body. Subsequently, according to the production and manufacturing requirements, the white body must be subjected to a salt spray corrosion resistance test.

In general, the body-in-white may be made of different sheet metal materials such as Al, HDG, CRS, EG, zinc magnesium aluminum sheet, and the like. The use of different sheet metal materials can result in a change in the manufacturing cost of the finished automobile.

For the zirconation treatment described above, it has been found that if the body-in-white is zirconated with a relatively inexpensive CRS panel, it is generally not possible to pass the salt spray corrosion resistance test. This requires that the car manufacturers have to use relatively expensive white bodies made of Al, HDG, EG, zinc magnesium aluminum sheet, etc. Besides the cost, the CRS plate has the advantages of low maintenance cost, easy shaping and other manufacturing aspects compared with Al, HDG, EG and zinc-magnesium-aluminum plates. Therefore, for the white body manufactured by adopting the CRS plate, various additives or resins are added into the tank liquor subjected to zirconium treatment, so that the white body can pass the salt spray corrosion resistance test smoothly to meet the production and manufacturing requirements. However, in this case, when the body-in-white enters the tank liquor subjected to the zirconium-forming treatment, a large amount of foam is likely to float in the tank liquor due to the movement of the body-in-white itself and/or the circulation stirring of the tank liquor. Thus, after the body-in-white is separated from the tank liquid, these foams are very likely to stick to corners of the body-in-white which are likely to contain liquid, such as roofs, wings, doors, rear covers, lamp holes, and the like, resulting in the occurrence of foam marks on the body-in-white. The presence of these foam marks can seriously affect the quality of the subsequent electrophoretic treatment. In order to remove these foam marks, it is generally necessary to provide a large number of manual flushing operations on the body-in-white after the body-in-white has been removed from the bath solution, or to provide special flushing equipment for cleaning.

Disclosure of Invention

In view of the above problems, the present utility model aims to provide a dipping treatment tank, so that a workpiece to be treated is not easy to leave foam marks on the surface of the workpiece after being treated by a tank liquid of the dipping treatment tank, thereby avoiding manpower or special flushing equipment.

According to one aspect of the present utility model, there is provided an immersion processing tank apparatus comprising:

a dipping tank defining an entry area for a workpiece to be treated to enter the dipping tank and an exit area opposite in length from the entry area for the workpiece to exit the dipping tank, the dipping tank apparatus further comprising:

a tank liquid circulation module provided for the immersion treatment tank, through which a liquid circulation of at least a part of the upper layer of the tank liquid leaving the exit area is formed when the immersion treatment tank is filled with the tank liquid; and

a tank liquor recovery module is provided for the tank for recovering at least the upper layer of liquor in the tank liquor and feeding it back into the tank (100) after defoaming to form the liquor circulation.

Optionally, the tank liquor circulation module comprises a plurality of nozzles arranged at or near the tank bottom of the dip tank and/or near the tank wall of the entrance zone and/or the exit zone and/or at an upper level of the tank liquor in the dip tank; and at least a first circulation pump in fluid communication with each of the nozzles to supply tank liquor to the nozzles to form a jet constituting the circulation of the liquor stream.

Optionally, the upper level of the bath solution is a position near and below the liquid level in the case where the immersion treatment tank is filled with a bath solution in an amount sufficient for treatment of the workpiece to be treated.

Optionally, the tank liquor recovery device comprises a second circulation pump, a liquor leakage structure provided in the tank for immersion treatment, and a defoaming tank provided at the tank for receiving at least an upper layer of liquor in the tank liquor, the defoaming tank being in fluid communication via the second circulation pump with a plurality of nozzles arranged at or near the tank bottom of the tank for immersion treatment and/or near the tank wall of the entrance zone and/or the exit zone and/or at least one of an upper layer position of the tank liquor in the tank for immersion treatment to supply the defoamed liquor back into the tank for immersion treatment to form the liquor circulation.

Optionally, one or more tube holders are provided at or near the bottom of the immersion treatment tank and/or near the tank walls of the entry zone and/or the exit zone and/or at the upper level of the immersion treatment tank liquid, the nozzles being arranged on the tube holders.

Optionally, each nozzle is rotatable and maintained at a specific angle relative to the dip tank or corresponding tube rack.

Optionally, a nozzle provided at or near the bottom of the dip tank is directed in a direction from the entrance area to the exit area; and/or nozzles disposed adjacent to the trough walls of the entry region are directed in a direction from an upper layer of the trough toward a lower layer of the trough; and/or nozzles disposed adjacent to the trough walls of the exit area are directed in a direction from a lower layer of the trough toward an upper layer of the trough; and/or nozzles disposed at an upper level of the immersion processing intra-tank liquid are directed in a direction from the exit region to the entry region, the liquid leakage structure being located at or near the entry region.

Optionally, a first number of the nozzles provided at or near the bottom of the dip tank are directed in a direction from the entrance area to the exit area, and a second number of the nozzles provided at or near the bottom of the dip tank are directed in a direction from the exit area to the entrance area; and/or nozzles disposed adjacent the trough walls of the entry and exit regions are directed in a direction from a lower layer of trough liquid toward an upper layer of trough liquid; and/or a first number of nozzles disposed in an upper level of the immersion processing in-tank liquid is directed in a direction from the exit region to the entry region, a second number of nozzles disposed in an upper level of the immersion processing in-tank liquid is directed in a direction from the entry region to the exit region, and the weeping structure is located between the first number of nozzles and the second number of nozzles disposed at or near a tank bottom of the immersion processing tank.

Optionally, a recess is formed in the bottom of the dip tank, the first circulation pump being in fluid communication with the recess via a line, the recess being proximate the exit region.

Optionally, a recess is formed at the bottom of the immersion treatment tank, the first circulation pump is in fluid communication with the recess via a pipeline, and the recess and the liquid leakage structure are respectively close to a length middle position of the immersion treatment tank.

Optionally, a further line is branched from the line, which further line is connected between the second circulation pump and the outlet of the defoaming tank.

Optionally, a further line is branched from the line, which further line is connected between the second circulation pump and the outlet of the defoaming tank.

Optionally, the defoaming tank is a defoaming tank that physically defoams and/or chemically defoams.

Optionally, the defoaming tank is a defoaming tank that physically defoams and/or chemically defoams.

Optionally, the immersion treatment tank apparatus further comprises a heat exchange module to control the temperature of the tank liquor circulated via the first circulation pump and/or the second circulation pump.

Optionally, the heat exchange module includes a heat exchanger provided with a first fluid passage through which the tank liquid supplied via the first circulation pump flows, and a second fluid passage selectively supplying a refrigerant or a heating medium.

Optionally, the immersion treatment tank device further comprises a central control unit to control the operation of the first and/or second circulation pumps, and/or the supply of a cooling or heating medium in the second fluid channel, and/or the on-off of a valve provided in a pipeline of the immersion treatment tank device.

Optionally, the nozzle is a venturi nozzle.

Optionally, the nozzle forms two liquid flow loops with opposite rotation directions in the tank liquid, so that the foam floating on the liquid surface moves towards the liquid leakage structure.

Optionally, the weeping structure is disposed away from the exit region.

By adopting the technical means, the workpiece to be treated, particularly the white car body, is prevented from foam residue after passing through the dipping treatment tank, so that the inconvenience of subsequent treatment procedures is caused.

Drawings

The principles and aspects of the present utility model will be more fully understood from the following detailed description taken together with the accompanying drawings. In the drawings:

FIG. 1 schematically shows a block diagram of a system of the immersion processing tank apparatus of the present utility model;

FIG. 2 shows a schematic diagram of an immersion processing tank according to one embodiment of the utility model;

fig. 3 shows a schematic view of a dip tank according to another embodiment of the utility model.

Detailed Description

Features that are structurally identical or functionally similar are denoted by the same reference numerals in the various figures of the utility model.

The technical solution of the utility model is only schematically described below with the aid of a dip tank used in a phosphorus-free surface chemical treatment line in a whole-vehicle painting shop. It should be clear to those skilled in the art that the technical solution of the present utility model is not limited to the dipping tank device used in the phosphorus-free surface chemical treatment production line in the whole car painting shop, and any dipping tank device used in the surface chemical treatment production line is applicable to the technical solution of the present utility model as described below in order to prevent foam marks when the parts are taken out after dipping.

In the production practice of the surface chemical treatment line, the inventors of the present utility model found that when the parts are treated in the dip treatment tank, since various additives or resins are added correspondingly in the tank liquid, the foam easily floats on the liquid surface, and when the parts are removed from the tank liquid, the foam easily adheres to the surface of the parts at the moment when the parts leave the liquid surface, thereby causing a mark of the foam after the parts leave the liquid surface.

It should be clear that in the context of the present utility model, a dip treatment tank refers to a non-shower liquid treatment tank. Typically, such a dip tank is placed stationary so that the parts to be treated are immersed in the tank liquid from one side of the tank so that the parts are completely submerged below the liquid level while the parts move or remain in the tank for a certain period of time, and then leave the tank liquid from the opposite side of the tank. For example, the component to be treated here may be a body in white. How to move the parts to be treated is not considered within the scope of the utility model, and the person skilled in the art can refer to any prior art.

As shown in fig. 1, the immersion treatment tank apparatus according to the present utility model generally includes an immersion treatment tank 100, a tank liquid circulation module 300 provided for the immersion treatment tank 100, and a tank liquid recovery module 200 provided for the immersion treatment tank 100, wherein the tank liquid circulation module 300 is configured to circulate a tank liquid in the immersion treatment tank in a specific direction, and the tank liquid recovery module 200 is configured to supply the tank liquid recovered from the immersion treatment tank 100 to the tank liquid circulation module 300 again after defoaming treatment.

Furthermore, in a preferred embodiment, the tank liquor recovery module 200 and the tank liquor circulation module 300 are connected to the central control unit 400 such that the tank liquor recovery module 200 and the tank liquor circulation module 300 and/or their associated components can operate accordingly under the direction of the central control unit 400. According to an alternative embodiment of the utility model, the immersion treatment tank arrangement further comprises a heat exchange module 500. The exchange module 500 is configured to exchange heat with the bath solution via a fluid supplied from an external heat source or a heat source, such that the temperature of the bath solution is controlled accordingly. The central control unit 400 is also connected to the heat exchange module 500 such that the heat exchange module 500 and/or its associated components are capable of performing an action under the direction of the central control unit 400.

Fig. 2 schematically shows an embodiment of an immersion treatment tank device according to the utility model. According to this embodiment, the dip tank 100 may be stationary relative to the ground, for example, in a surface chemical treatment line shop. The dip tank 100 may be of any suitable shape known to those skilled in the art, and is generally boat-shaped in the illustration of fig. 2. Of course, the immersion processing tank 100 may have another shape such as a cubic shape. Sufficient treatment liquid may be supplied into the immersion treatment tank 100 in advance via a treatment liquid source (not shown). In an alternative embodiment, the treatment fluid may also be selectively fed into the dip treatment tank 100 from a treatment fluid source (not shown) via a tank fluid circulation module 300, described later.

When the body-in-white 10 is subjected to the dipping treatment, the body-in-white 10 is first suspended into one edge region (e.g., the upper left side region shown in the drawing) of the dipping treatment tank 100 via a moving hoist (not shown), is completely immersed in the dipping treatment tank 100, e.g., moved to near the bottom of the dipping treatment tank 100, while the body-in-white 10 is moved forward in the dipping treatment tank 100, during which other actions such as turning the body-in-white 10 under action of the moving hoist can be performed. Finally, the body-in-white 10 exits the dipping tank 100 from the other edge region (e.g., the upper right side region shown in the drawing) of the dipping tank 100 opposite in the longitudinal direction thereof. In the embodiment of the present utility model, one of two edge regions of the dipping treatment tank 100 opposite in the length direction thereof defines an entrance region of the dipping treatment tank 100, and the other defines an exit region of the dipping treatment tank 100.

In the example of fig. 2, although the dipping tank 100 is shown as a boat shape, it should be apparent to those skilled in the art that the dipping tank 100 also has a certain width dimension in a direction perpendicular to the computer screen or perpendicular to the paper surface. A plurality of racks are respectively arranged on the side walls of the dipping treatment tank 100. In the embodiment shown, there are three tube racks B1, B2 and B3. A plurality of nozzles 320, for example, a plurality of venturi nozzles 320, are provided on each of the tube holders B1, B2, and B3. According to embodiments of the utility model, the nozzles 320 may be configured to rotate and maintain a particular angle relative to the respective tube rack as desired. For example, each nozzle 320 can be retained on a corresponding tube rack using any of the snap-in retainers known to those skilled in the art having a locking function, such that the nozzle 320 can be manually rotated as desired relative to the tube rack and locked in a rotated position accordingly.

According to aspects of the present utility model, each tube rack may be a structure of tubes such that all of the nozzles 320 in each tube rack are in fluid communication. In this way, as long as the tube or tubes in the tube rack are supplied with pressurized liquid, the pressurized liquid can be directed out through all of the nozzles 320, forming a directed jet. The orientation of the nozzles 320 in each tube rack may be different from each other or the same as each other. Furthermore, the orientation of the nozzles 320 is different between different racks.

The outlet end of the first circulation pump 310 is connected to the racks B1, B2 and B3 via the lines L1, L2 and L3, respectively, and the inlet end of the first circulation pump 310 is connected to the bottom of the immersion processing tank 100 via the line L4. For example, a recess 110 is formed at the bottom of the immersion processing tank 100.

Although the racks B1, B2, B3 are shown as straight lines in fig. 2, it should be apparent to those skilled in the art that the scale of the racks B1, B2, B3 may be expanded in the width direction of the dipping treatment tank 100. For example, for the pipe rack B1 arranged at the bottom of the immersion treatment tank 100, it may be constituted by a plurality of pipes which are side by side and in fluid communication with each other, the interiors of which are not in communication with the immersion treatment tank 100 except for the venturi nozzle 320. Pipe racks B2, B3 of similar construction are arranged at the two slopes of the boat-shaped dipping tanks 100, respectively. In the case where the immersion treatment tank 100 is cubical, the two pipe racks B2, B3 may also be arranged at the two longitudinal side walls of the immersion treatment tank 100.

A pipe rack B4 is also disposed in the immersion processing tank 100. The pipe rack B4 may be arranged at a lateral side wall of the immersion processing tank 100, for example. In an embodiment of the present utility model, the structure of the tube frame B4 may be far smaller than the other tube frames B1, B2, B3 in terms of the width dimension of the dip treatment tank 100. For example, the plurality of venturi nozzles 320 in tube rack B4 may be arranged in a single row or in a double row. In a preferred embodiment, two tube holders B4 as shown may be provided, which are disposed at both lateral side walls of the dipping treatment tank 100, respectively. The pipe rack B4 is arranged in the immersion treatment tank 100 such that the nozzles 320 on the pipe rack B4 or the pipe rack B4 are located at a small distance below the liquid surface or close to and below the liquid surface in the case that the tank liquor in the immersion treatment tank 100 is at a liquid level at which the components to be treated, such as the body-in-white 10, can be suitably treated. Therefore, it can be said that the pipe rack B4 or the nozzles 320 on the pipe rack B4 are located at an upper level in the bath.

In summary, the construction and arrangement of the tube racks B1, B2, B3, B4 within the dip tank 100 is preferably such that the movement of the body-in-white 10 in the dip tank 100 is not affected. The lines L1, L2, L3, L4, L6 (or other lines as explained below) are introduced into the immersion processing tank 100 from the outside in such a manner that the liquid tightness of the immersion processing tank 100 is not affected.

The inlet end of the first circulation pump 310 is in fluid communication with the dip tank 100 via line L4, such as a recess 110 connected to the bottom of the dip tank 100. A valve F1, which may be a manual valve or a solenoid valve, for example, is provided in the line between the outlet end of the first circulation pump 310 and the lines L1, L2, L3. By the valve F1, the supply of liquid to the racks B1, B2, and B3 via the first circulation pump 310 can be controlled, and the circulation of the fluid in the immersion processing tank 100 can be regulated. Furthermore, it should be clear to a person skilled in the art that similar valves F1 may also be provided in the lines L1 and/or L2 and/or L3 and/or L4, respectively. The individual switching of these valves F1 can correspondingly affect or change the fluid circulation within the immersion treatment tank 100.

In the illustrated embodiment, a line L5 branches from line L4, in fluid communication with the inlet end of the second circulation pump 311, and the outlet end of the second circulation pump 311 is in fluid communication with the pipe rack B4 via line L6. A valve F2 is provided in the line L5 to control the on-off of the liquid in the line L5.

By adjusting the orientation of the venturi nozzles 320 on each of the racks B1, B2, B3, and B4, a circulation of liquid is created in the tank liquid in the immersion processing tank 100 when the first circulation pump 310 and the second circulation pump 311 are operated. The liquid flow circulates in such a manner that a lower layer of the bath liquid in the immersion processing tank 100 (near the closed bottom of the immersion processing tank 100) goes from a part to be processed entering region (e.g., left side in fig. 2) of the immersion processing tank 100 toward a part to be processed exiting region (e.g., right side in fig. 2) of the immersion processing tank 100; and an upper layer of bath liquid in the immersion processing tank 100 (near the open top of the immersion processing tank 100) is directed from a part-to-be-processed exit region of the immersion processing tank 100 toward a part-to-be-processed entry region of the immersion processing tank 100; meanwhile, near the entering area of the parts to be treated of the dipping treatment tank 100, the liquid flow is from the upper layer of the tank liquid to the lower layer of the tank liquid; while the flow of liquid is directed from the lower layer of bath liquid toward the upper layer of bath liquid in the vicinity of the part-to-be-treated exit area of the immersion treatment bath 100. If such a circulation of the liquid is possible, the bath liquid in the immersion treatment bath 100, in particular the liquid at the level of the bath liquid, is driven by the circulation of the liquid, and is continuously moved from the part-to-be-treated exit region of the immersion treatment bath 100 toward the part-to-be-treated entry region of the immersion treatment bath 100.

Since if foam is present in the bath solution in the dip tank 100, such foam will typically float on the liquid surface (be exposed to air). Thus, during the movement of the liquid at the level of the bath liquid from the part-to-be-treated exit area of the immersion treatment tank 100 toward the part-to-be-treated entry area of the immersion treatment tank 100 as described above, the foam on the liquid surface will also move continuously toward the part-to-be-treated entry area, which will result in substantially reduced or no foam in the part-to-be-treated exit area of the immersion treatment tank 100. Thus, for a tank liquor in which there is a dip tank 100 such as shown in fig. 2, after the body-in-white 10 enters the dip tank 100 from the entry area, although foam may adhere to the surface, when the body-in-white 10 travels at the bottom of the dip tank 100, the initially adhering foam has substantially detached from the body-in-white 10, and finally when the body-in-white 10 exits from the area, little or no foam will remain on any surface of the body-in-white 10, thus eliminating the effect of foam marking on subsequent processing.

To achieve the above-described circulation of the liquid flow, the venturi nozzle 320 on the tube holder B1 may be configured to be directed in a direction from the part-to-be-treated entering area of the immersion treatment tank 100 to the part-to-be-treated exiting area of the immersion treatment tank 100. In the context of the present utility model, the fact that the venturi nozzle is directed in a certain direction does not mean that the jet ejected through the venturi nozzle only strictly follows or is parallel to the direction, but may also be slightly deflected by a small angle (for example a small angle in the range of less than 90 degrees) with respect to the direction.

To achieve the above-described circulation of the liquid flow, the venturi nozzle 320 on the tube holder B4 may be configured to be directed in a direction from the part-to-be-treated exiting area of the immersion treatment tank 100 to the part-to-be-treated entering area of the immersion treatment tank 100; the venturi nozzle 320 on tube holder B2 may be configured to be directed in a direction from the lower layer of bath toward the upper layer of bath; the venturi nozzle 320 on tube holder B3 may be configured to be directed in a direction from the upper layer of bath toward the lower layer of bath.

For example, in the embodiment shown in FIG. 2, the first and second circulation pumps 310, 311, the venturi nozzle 320, the associated pipe racks and lines, and the valves F1, F2 generally form a tank fluid circulation module 300.

In order to avoid that too much foam is accumulated at the entry area of the component to be treated in the immersion treatment tank 100, which would lead to a spreading towards the exit area and thus to foam marks occurring when the body-in-white 10 leaves the immersion treatment tank 100, a weeping structure G1 is provided at the entry area of the component to be treated in the embodiment shown in fig. 2. For example, the liquid leakage structure G1 may be configured in a box with a baffle at the entry area of the part to be treated, so that the top edge of the baffle is level with the liquid level, so that the tank liquid entering the box can generate a waterfall-like effect after passing through the baffle, and thus, the foam floating on the liquid level can be brought into the box. The weeping structure G1 is in fluid communication with a defoaming tank 210 via line L7. A valve F3 is provided in the line L7 to control the on-off of the fluid in the line L7. The defoaming tank may be a defoaming tank that physically defoams and/or chemically defoams. For example, for a defoaming tank that chemically defoams, a defoaming agent commonly used in the art may be provided in the defoaming tank 210 to eliminate foam in the liquid received by line L7. The defoaming tank 210 is in fluid communication with the inlet end of the second circulation pump 311 via the line L8, so that the defoamed liquid is supplied to the pipe rack B4 via the lines L8 and L6 under the driving of the second circulation pump 311, and the formation of the desired liquid circulation is further promoted. For another example, for a physically defoaming tank, a labyrinth defoaming structure such as a serpentine partition, barbed mesh, or the like may be provided within the tank body of the defoaming tank 210.

Thus, for example, in the embodiment shown in FIG. 2, the weeping structure G1, the defoaming tank 210, the second circulation pump 311, the associated pipe racks and lines, and the valve F3 generally form a tank recovery module 200.

In the embodiment shown in fig. 2, the valve F2 provided in line L5 enables tank liquor to be provided to the inlet end of the second circulation pump 311 and/or to the defoaming tank 210 as desired, and under the cooperative operation of the valve F3 in line L7, can assist the defoaming agent within the defoaming tank 210 in acting to eliminate foam within the dip tank 100. For example, when too much foam has not floated on the tank liquid surface at the beginning of the operation of the immersion treatment tank 100, the valve F3 in the line L7 may be in the off state and the valve F2 in the line L5 may be made in the on state, thereby allowing the second circulation pump 311 to draw the venturi nozzle 320 on the tank liquid supply pipe rack B4 from the immersion treatment tank 100 via the line L5. For example, when the foam in the tank liquid in the immersion treatment tank 100 is too much, the valve F3 in the line L7 may be brought into an on state and the valve F2 in the line L5 may be brought into an off state, so that the second circulation pump 311 supplies the defoamed liquid to the venturi nozzle 320 of the pipe holder B4 to participate in the generation of the liquid flow circulation.

In alternative embodiments, the second circulation pump 311 may be configured with its outlet end in fluid communication with any of the lines L1, L2, L3. That is, the defoamed liquid may be sprayed in the dipping tank 100 via the venturi nozzle 320 of any one of the pipe frames B1, B2, B3.

Since temperature control also has a significant effect on the generation of foam in the liquid, a heat exchanger 510 is provided downstream of the first circulation pump 310 in accordance with a preferred embodiment of the present utility model. For example, the heat exchanger may be in the form of any suitable heat exchanger, such as a tube-in-tube heat exchanger, a shell-and-tube heat exchanger, or the like. In such a heat exchanger 510, two fluid passages isolated from each other, namely a first fluid passage and a second fluid passage, are provided. The outlet end of the first circulation pump 310 is in fluid communication with, for example, a first passage, while a second fluid passage may be selectively connected to either a heating medium or a cooling medium.

For example, in embodiments of the present utility model, the heating or cooling medium accessed by the second fluid passage may be from a hot or cold water source commonly used in a whole vehicle paint shop or other industrial plant. When the second fluid channel is connected with the heating medium, the temperature of the tank liquid in the first fluid channel can be raised through heat exchange; when the second fluid channel is connected with the refrigerant, the tank liquor in the first fluid channel can be cooled by heat exchange. Thus, the heat exchanger 510, and the optionally accessed heating and cooling media, generally comprise the heat exchange module 500. Therefore, according to the technical scheme of the utility model, the temperature of the bath solution is adjusted by using a heat medium source and a cold medium source which are common in a workshop, so as to correspondingly eliminate the foam amount in the bath solution and further reduce the foam trace of the white car body 10 treated by the dipping treatment tank 100.

In an alternative embodiment, an additional line is provided downstream of the illustrated valve F1 in addition to the connection lines L1, L2, L3, which additional line is connected directly to the line L6, and in which additional line a valve is provided for controlling the on-off of the liquid in the additional line, so that it is ensured that a first circulation pump 310 can simultaneously feed the racks B1, B2, B3 and B4. In this case, the first circulation pump 310, venturi nozzle 320, associated piping and tubing, and valves F1, F2 generally form a tank fluid circulation module 300.

Fig. 3 schematically illustrates an immersion processing tank 100 according to another embodiment of the present utility model. Compared to the embodiment shown in fig. 2, this embodiment differs in that the weeping structure G1 is provided between the entering area and the exiting area of the part to be treated, and that the upper level in the bath is provided with two tube holders B41 and B42, which are sandwiched between the entering area and the weeping structure G1 and between the weeping structure G1 and the exiting area, respectively, the tube holder B41 being in fluid communication with the outlet end of the second circulation table 311 via a line L61, the tube holder B42 being in fluid communication with the outlet end of the second circulation pump 311 via a line L62; further, front and rear two pipe racks B11 and B12 are arranged at the bottom of the immersion processing tank 100 and are spaced apart from each other, so that a recess 110 for connecting the line L4 is formed between the two pipe racks B11 and B12 at the bottom of the immersion processing tank 100. In the embodiment shown in fig. 3, those features labeled identically to those of fig. 2 may be described with reference to the embodiment of fig. 2. In the illustrated embodiment, racks B41 and B42 or nozzles 320 on racks B41 and B42 are at a small distance below the liquid surface or are near and below the liquid surface.

In the embodiment shown in fig. 3, the outlet end of the first circulation pump 310 is in fluid communication with racks B11, B12, B2, B3 via lines L11, L12, L2, L3, enabling the venturi nozzles 320 on these racks to shoot liquid. By adjusting the orientation of the venturi nozzles 320 on each of the racks B11, B12, B2, B3 and B41, B42, a circulation of the liquid flow as shown in fig. 3 is generated in the bath liquid in the immersion processing bath 100 when the first circulation pump 310 and the second circulation pump 311 are operated. The liquid flow circulates in such a manner that a lower layer of the bath liquid in the immersion processing bath 100 (near the closed bottom of the immersion processing bath 100) is directed from the middle (i.e., the region where the recess 110 is located) toward the region where the parts to be processed of the immersion processing bath 100 enter (e.g., the left side in fig. 3) and the region where the parts to be processed of the immersion processing bath 100 leave (e.g., the right side in fig. 3), respectively; and the upper layer of the bath solution in the immersion treatment tank 100 (near the open top of the immersion treatment tank 100) is directed from the entrance region and the exit region toward the drain structure G1 (approximately in the middle), respectively. By the circulation of the liquid thus formed, the foam in the dipping tank 100 is brought substantially toward the middle of the liquid level of the tank liquid, so that by the liquid circulation of this embodiment, it is also possible to ensure a significant reduction in the amount of foam in the exit area, thereby improving the foam mark eliminating effect of the body-in-white 10 after leaving the tank liquid, via the liquid leakage structure G1 in the middle. Thus, in the illustrated embodiment, the nozzles 320 are arranged to form two fluid circulation in opposite directions within the bath so that foam floating on the liquid surface moves toward the weeping structure G1.

In embodiments and modifications of the present utility model, each of the circulation pumps 310 and 311 may be controlled manually or by a computer program via the central control unit 400. In addition, in the case that the valves are solenoid valves, the solenoid valves may be controlled by a computer program through the central control unit 400. Furthermore, it should be clear to the person skilled in the art that the venturi nozzles 320 may also be arranged in the dip tank instead of via a pipe rack, for example in alternative embodiments the venturi nozzles 320 may be mounted directly on the tank wall and supplied with liquid from the respective circulation pump via hoses.

Although specific embodiments of the utility model have been described in detail herein, they are presented for purposes of illustration only and are not to be construed as limiting the scope of the utility model. Furthermore, it should be clear to a person skilled in the art that the embodiments described in the present specification can be used in combination with each other. Various substitutions, alterations, and modifications can be made without departing from the spirit and scope of the utility model.

Claims (20)

1. An immersion processing tank apparatus comprising:

-an immersion treatment tank (100), the immersion treatment tank (100) defining an entry zone for a workpiece to be treated into the immersion treatment tank (100) and an exit zone opposite in length to the entry zone for a workpiece to be treated to leave the immersion treatment tank (100), characterized in that the immersion treatment tank device further comprises:

a tank liquid circulation module (300) disposed for the immersion treatment tank (100), wherein, when the immersion treatment tank (100) is filled with a tank liquid, a liquid circulation is formed in which at least a part of the upper liquid in the tank liquid leaves the exit region, via the tank liquid circulation module (300); and

a tank liquor recovery module (200) is provided for the immersion treatment tank (100) to recover at least the upper layer of liquor in the tank liquor and supply it back into the immersion treatment tank (100) after defoaming to form the liquid flow cycle.

2. The immersion treatment tank arrangement according to claim 1, characterized in that the tank liquor circulation module (300) comprises a plurality of nozzles (320) arranged at or near the tank bottom of the immersion treatment tank (100) and/or near the tank wall of the entry zone and/or the exit zone and/or at the upper level of the tank liquor in the immersion treatment tank (100); and at least a first circulation pump (310), the at least a first circulation pump (310) being in fluid communication with each of the nozzles (320) to supply tank liquor to the nozzles (320) to form jets constituting the liquid stream circulation.

3. Immersion processing tank apparatus according to claim 2, characterized in that the upper level of the tank liquid is a position close to and below the liquid surface in the case where the tank (100) is filled with a tank liquid in an amount sufficient for the processing of the workpiece to be processed.

4. A tank arrangement according to claim 3, characterized in that the tank liquor recovery module (200) comprises a second circulation pump (311), a liquid leakage structure (G1) provided in the tank (100), and a defoaming tank (210), the liquid leakage structure (G1) being provided at the tank (100) to receive liquid of at least an upper layer in the tank liquor, the defoaming tank (210) being in fluid communication via the second circulation pump (311) with a plurality of nozzles arranged at or near the tank bottom of the tank (100) and/or near the tank wall of the inlet zone and/or the outlet zone and/or at least one of the upper layer positions of the tank liquor in the tank (100) to supply defoamed back into the tank (100) to form the liquid circulation.

5. Immersion treatment tank arrangement according to claim 4, characterized in that one or more pipe racks (B1, B11, B12, B2, B3, B4) are provided at or near the tank bottom of the immersion treatment tank (100) and/or near the tank wall of the entry zone and/or the exit zone and/or at the upper level of the tank liquor in the immersion treatment tank (100), the nozzles (320) being arranged on the pipe racks (B1, B11, B12, B2, B3, B4).

6. The dip tank apparatus according to claim 5, wherein each nozzle (320) is rotatable and maintained at an angle with respect to the dip tank (100) or a corresponding tube rack.

7. The dip tank arrangement according to claim 6, characterized in that a nozzle (320) provided at or near the tank bottom of the dip tank (100) is directed in a direction from the entry zone to the exit zone; and/or nozzles (320) disposed adjacent the trough walls of the entry region are directed in a direction from an upper layer of the trough liquid toward a lower layer of the trough liquid; and/or nozzles (320) disposed adjacent the trough walls of the exit area are directed in a direction from a lower layer of the trough liquid toward an upper layer of the trough liquid; and/or a nozzle (320) arranged at an upper level of the bath in the immersion treatment bath (100) is directed in a direction from the exit region to the entry region, the liquid leakage structure (G1) being located at or near the entry region.

8. The immersion treatment tank apparatus according to claim 6, characterized in that a first number of the nozzles (320) provided at or near the tank bottom of the immersion treatment tank (100) are directed in a direction from the entry area to the exit area, and a second number of the nozzles (320) provided at or near the tank bottom of the immersion treatment tank (100) are directed in a direction from the exit area to the entry area; and/or nozzles (320) disposed adjacent the trough walls of the entry and exit regions are directed in a direction from a lower layer of trough liquid toward an upper layer of trough liquid; and/or a first number of nozzles (320) among the nozzles (320) disposed at an upper level of the bath in the dip tank (100) are directed in a direction from the exit region to the entrance region, a second number of nozzles (320) among the nozzles (320) disposed at an upper level of the bath in the dip tank (100) are directed in a direction from the entrance region to the exit region, and the liquid leakage structure (G1) is located between the first number of nozzles (320) and the second number of nozzles (320) among the nozzles (320) disposed at or near a bottom of the dip tank (100).

9. Immersion treatment tank device according to claim 6, characterized in that a recess (110) is formed in the bottom of the immersion treatment tank (100), the first circulation pump (310) being in fluid communication with the recess (110) via a line (L4), the recess (110) being close to the exit area.

10. The immersion treatment tank apparatus according to claim 7, wherein a recess (110) is formed at a bottom of the immersion treatment tank (100), the first circulation pump (310) is in fluid communication with the recess (110) via a line (L4), and the recess (110) and the liquid leakage structure (G1) are respectively close to a length intermediate position of the immersion treatment tank (100).

11. Immersion treatment tank device according to claim 9, characterized in that a further line (L5) branches off from the line (L4), which further line (L5) is connected between the second circulation pump (311) and the outlet of the defoaming tank (210).

12. Immersion treatment tank device according to claim 10, characterized in that a further line (L5) branches off from the line (L4), which further line (L5) is connected between the second circulation pump (311) and the outlet of the defoaming tank (210).

13. The immersion processing tank apparatus according to claim 11, wherein the defoaming tank is a defoaming tank for physically defoaming and/or chemically defoaming.

14. The immersion processing tank apparatus according to claim 12, wherein the defoaming tank is a defoaming tank for physically defoaming and/or chemically defoaming.

15. Immersion treatment tank apparatus according to claim 8, characterized in that the nozzles form two liquid flow cycles in opposite directions in the tank liquid, so that foam floating on the liquid surface moves towards the weeping structure (G1).

16. Immersion treatment tank device according to claim 15, characterized in that the weeping structure (G1) is arranged remote from the exit area.

17. The immersion treatment tank apparatus according to any one of claims 2 to 16, further comprising a heat exchange module (500) to control the tank liquor temperature circulated via the first circulation pump (310) and/or the second circulation pump (311).

18. The immersion treatment tank apparatus according to claim 17, characterized in that the heat exchange module (500) includes a heat exchanger (510), the heat exchanger (510) being provided with a first fluid passage through which tank liquid supplied via the first circulation pump (310) flows, and a second fluid passage selectively fed with a refrigerant or a heating medium.

19. Immersion treatment tank device according to claim 18, further comprising a central control unit (400) to control the operation of the first circulation pump (310) and/or the second circulation pump (311), and/or the supply of cooling or heating medium in the second fluid channel, and/or the switching of valves provided in the lines of the immersion treatment tank device.

20. The immersion processing tank apparatus according to any one of claims 2 to 16, wherein the nozzle is a venturi nozzle.