Novel dip-coating device

Abstract

The utility model discloses a novel dip-coating device, which comprises a coating supply module, a dip-coating module and a dip-coating module, the feeding and dip-coating module is detachably arranged below the paint supply module, is used for receiving paint and completing dip-coating of products and comprises a feeding area and a dip-coating area which are arranged in a separated mode, the feeding area is communicated with the paint supply module, the dip-coating area is connected to the feeding area through a feeding pipeline, a feeding pump is arranged on the feeding pipeline, and the dip-coating area is connected to the dip-coating area. The coating in the dip-coating area overflows to the feeding area; and the filtering module is fixedly connected with the coating supply module, located below the feeding and dip-coating module and used for receiving the coating in the feeding area or the dip-coating area and filtering the coating, the filtering module is connected to the coating supply module through a backflow pipeline, and a backflow pump is arranged on the backflow pipeline. The novel dip-coating device provided by the utility model can reduce the energy consumption and improve the dip-coating quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of dip coating, and particularly relates to a novel dip coating device. Background Art

[0002] Sand cores are sand molds used to create cavities or internal structures in the casting process. They support and position the molten metal during the casting process. During the production of sand cores, a special coating is applied to the surface of the sand cores to improve their performance and fire resistance.

[0003] In the prior art, the dipping equipment occupies a large area. For example, Chinese patent CN111558699A discloses a fully automatic coating pool device for sand core dipping, which includes a dipping pool and a coating filter pool. The dipping pool and the coating filter pool are arranged in parallel, occupying a large area. The coating in the coating bucket needs to be supplied to the dipping pool through an automatic feeding pipeline. During the dipping process, the coating will precipitate, and the density and viscosity of the coating will change, affecting the dipping quality of the sand core surface. The waste and inefficient circulation of the coating increase production costs and reduce the competitiveness of the enterprise. Utility Model Content

[0004] Based on the above problems, the utility model aims to provide a novel dipping device which occupies a small area and improves the dipping quality.

[0005] In order to overcome the deficiencies of the prior art, the technical solution provided by the utility model is:

[0006] New dip coating device, including:

[0007] A coating supply module, used for supplying coating required for dip coating;

[0008] A feeding and dipping module, which is detachably arranged below the paint supply module, is used to receive the paint and complete the dipping of the product, and includes a feeding area and a dipping area that are separated and arranged, the feeding area is connected to the paint supply module, the dipping area is connected to the feeding area via a feeding pipeline, a feeding pump is provided on the feeding pipeline, and the paint in the dipping area overflows to the feeding area;

[0009] A filter module is fixedly connected to the paint supply module and is located below the feeding and dipping module, and is used to receive the paint in the feeding area and the dipping area and filter it. The filter module is connected to the paint supply module via a reflux pipeline, and a reflux pump is provided on the reflux pipeline.

[0010] In one embodiment, the paint supply module includes a material supply tank and an agitator arranged in the material supply tank, the material supply tank is provided with a feeding port connected to an automatic proportioning device and a first heating component, the material supply tank is provided with a first liquid level meter, a first viscometer, a first liquid level specific gravity meter and a first thermometer, the first liquid level meter, the first viscometer, the first liquid level specific gravity meter, the first thermometer, the automatic proportioning device, the first heating component and the agitator are respectively connected to the control unit signal.

[0011] In one of the embodiments, a feed port corresponding to the feed adding area is provided at the bottom of the feed tank, and the feed port is provided with a first valve connected to the control unit by signal.

[0012] In one embodiment, the feeding and dipping module comprises a dipping pool and a partition disposed in the dipping pool, wherein the partition extends in a vertical direction and divides the dipping pool into a feeding area and a dipping area;

[0013] A first discharge port is provided at the bottom of the feeding zone, and a second valve is provided at the first discharge port. A second discharge port is provided at the bottom of the dipping zone, and a third valve is provided at the second discharge port. The second valve and the third valve are connected to the control unit by signal.

[0014] In one embodiment, a second liquid level meter, a second viscometer, a second liquid level specific gravity meter, a second thermometer and a second heating component are provided in the feeding area, and a third liquid level meter is provided in the dipping area. The second liquid level meter, the second viscometer, the second liquid level specific gravity meter, the second thermometer, the third liquid level meter and the second heating component are respectively connected to the control unit signal.

[0015] In one of the embodiments, the bottom of the dipping zone is arranged to be inclined upward from an end close to the partition plate to an end away from the partition plate.

[0016] In one of the embodiments, a folding sliding door mechanism is provided at the upper end of the dipping area for keeping the dipping area in a sealed state, the folding sliding door mechanism includes two symmetrically arranged sliding door assemblies, the sliding door assembly includes a support platform arranged at the upper end of the dipping pool, a fixed cover fixed on the support platform, at least one movable cover movably arranged relative to the fixed cover, and a driving component for driving the movable cover to move, and the movable cover is arranged on the outside of the fixed cover.

[0017] In one embodiment, the support platform is in the shape of a step, the fixed cover is fixedly set on the upper step, and the movable cover is slidably set on the lower step; the fixed cover is close to the end of the movable cover or the movable cover located on the inner side and is provided with a first limiting member, the movable cover is close to the end of the fixed cover or the movable cover located on the outer side and is provided with a limiting block cooperating with the first limiting member, and a second limiting member is provided on the inner side of the end of each movable cover away from the fixed cover.

[0018] In one embodiment, the filter module includes a filter tank, a multi-stage filter assembly and a paint recovery hopper arranged from top to bottom, and the paint recovery hopper is connected to the feed tank via the return pipeline.

[0019] In one of the embodiments, a fourth liquid level meter is provided in the filter tank, and the fourth liquid level meter is connected to the control unit by signal.

[0020] Compared with the prior art, the advantages of the utility model are:

[0021] 1. The paint supply module, the feeding and dipping module and the filtering module are arranged vertically, occupying a small space. The paint flows between adjacent modules by gravity, which reduces the use of power pumps and power consumption;

[0022] 2. The feeding and dipping module includes a separated feeding area and a dipping area. A feeding pipeline and a feeding pump are arranged between the dipping area and the feeding area. The feeding pump is used to realize the circulating stirring of the coating between the feeding area and the dipping area, so as to avoid the precipitation of the coating during the dipping process and improve the uniformity of the dipping;

[0023] 3. The feeding and dipping module is detachably arranged under the paint supply module and can be replaced as needed to adapt to the dipping of different products and improve production flexibility;

[0024] 4. A folding sliding door mechanism is set above the dipping area to reduce the contact between the paint and the air during the dipping process, reduce the volatilization of the solvent and the influence of the ambient temperature and humidity on the paint, further ensure the uniformity of the paint, reduce pollution and optimize the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a novel dipping coating device involved in the utility model;

[0027] Figure 2 It is a top view of the feeding and dipping module in the embodiment of the utility model;

[0028] Figure 3 This is one of the structural schematic diagrams of the folding sliding door mechanism in the embodiment of the utility model;

[0029] Figure 4 This is the second structural diagram of the folding sliding door mechanism in the embodiment of the utility model;

[0030] Figure 5 This is a structural schematic diagram of the folding sliding door mechanism in the embodiment of the utility model without the driving component;

[0031] Figure 6 for Figure 5 A partial enlarged cross-sectional view at center;

[0032] Figure 7 for Figure 5 A partial enlarged cross-sectional view at point B in the middle;

[0033] in:

[0034] 1. Paint supply module; 1-1. Feed tank; 1-1a. Feed port; 1-1b. First valve; 1-2. Agitator; 1-3. First liquid level gauge;

[0035] 2. Feeding and dipping module; 2-1. Dipping tank; 2-1a. Feeding area; 2-1b. Dipping area; 2-2. Baffle; 2-3. Feeding pipeline; 2-4. Feeding pump; 2-5. Second liquid level gauge; 2-6. Third liquid level gauge; 2-7. Second valve; 2-8. Third valve;

[0036] 3. Filter module; 3-1. Filter tank; 3-1a. Fourth liquid level gauge; 3-2. Multi-stage filter assembly; 3-3. Paint recovery bucket;

[0037] 4. Return pipe;

[0038] 5. Reflux pump;

[0039] 6. Framework;

[0040] 7. Support leg;

[0041] 8. Folding sliding door mechanism; 8-1. Support platform; 8-2. Fixed cover; 8-3. Moving cover; 8-4. Driving component; 8-5. Guide rail; 8-6. Roller;

[0042] 9. The first limiter;

[0043] 10. Limit block;

[0044] 11. The second limiter. DETAILED DESCRIPTION

[0045] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0046] See also Figure 1 , which is a new type of dipping coating device of the utility model, comprises a coating supply module 1, a feeding dipping coating module 2 and a filtering module 3 arranged from top to bottom, wherein the filtering module 3 is fixedly connected to the coating supply module 1 and there is a space between the two for placing the feeding dipping coating module 2.

[0047] In this example, the filter module 3 and the paint supply module 1 are arranged on the frame 6, and a rolling wheel is arranged at the bottom of the feeding and dipping module 2, which can slide into the frame 6 and then be fixedly connected to the frame 6 via positioning pins and bolts. When dipping, different feeding and dipping modules 2 can be used according to different products. In order to improve the stability of the feeding and dipping module 2, a support leg 7 is arranged on one side of the bottom of the feeding and dipping module 2.

[0048] The coating supply module 1 is used to supply the coating required for dipping, including a feeding tank 1-1 and an agitator 1-2 arranged in the feeding tank 1-1. The feeding tank 1-1 is provided with a feeding port 1-1a connected to an automatic proportioning device and a first heating component. The feeding tank 1-1 is provided with a first liquid level meter 1-3, a first viscometer, a first liquid level specific gravity meter and a first thermometer. The first liquid level meter 1-3, the first viscometer, the first liquid level specific gravity meter, the first thermometer, the automatic proportioning device, the first heating component and the agitator 1-2 are respectively connected to the control unit signal.

[0049] Among them, the automatic proportioning device is a prior art, which can automatically and accurately dynamically proportion and add the paint slurry and clean water according to a predetermined ratio. The first heating component is a prior art, for example, an electric heater or a heat exchanger is used to heat the paint in the feed tank 1-1 to a certain temperature. The control unit controls the operation of the automatic proportioning device, the first heating component, and the agitator 1-2 according to the data monitored by the first liquid level meter 1-3, the first viscometer, the first liquid level specific gravity meter and the first thermometer, so that the paint in the feed tank 1-1 meets the requirements of dip coating production.

[0050] In order to facilitate the paint in the feeding pool 1-1 to enter the feeding and dipping module 2, a feeding port is provided at the bottom of the feeding pool 1-1, and a first valve 1-1b is provided at the feeding port. The first valve 1-1b is connected to the control unit signal, and the control unit controls the opening or closing of the first valve 1-1b to realize automatic feeding.

[0051] The feeding and dipping module 2 is used to receive the paint and complete the dipping of the product, including a feeding area 2-1a and a dipping area 2-1b which are separated. The feeding area 2-1a corresponds to the discharge port of the feed tank 1-1, and the dipping area 2-1b is connected to the feeding area 2-1a via a feeding pipeline 2-3. A feeding pump 2-4 is provided on the feeding pipeline 2-3. The paint in the dipping area 2-1b overflows to the feeding area 2-1a. The paint in the feeding area 2-1a is extracted to the dipping area 2-1b by the feeding pump 2-4. At the same time, the paint in the dipping area 2-1b can overflow to the feeding area 2-1a, thereby realizing the circulation stirring of the paint between the feeding area 2-1a and the dipping area 2-1b, avoiding the precipitation of the paint during the dipping process, improving the uniformity of the paint, and thus improving the quality of the dipping.

[0052] Specifically, the feeding and dipping module 2 includes a dipping pool 2-1 and a partition 2-2 arranged in the dipping pool 2-1, the partition 2-2 extends in the vertical direction and divides the dipping pool 2-1 into a feeding area 2-1a and a dipping area 2-1b, a first discharge port is provided at the bottom of the feeding area 2-1a, a second valve 2-7 is provided at the first discharge port, a second discharge port is provided at the bottom of the dipping area 2-1b, a third valve 2-8 is provided at the second discharge port, the second valve 2-7 and the third valve 2-8 are connected to the control unit signal, and the second valve 2-7 and the third valve 2-8 are automatically opened or closed by the control unit.

[0053] In order to facilitate monitoring of the quality and liquid level of the coating in the feeding area 2-1a and the dipping area 2-1b, a second liquid level meter 2-5, a second viscometer, a second liquid level specific gravity meter, a second thermometer and a second heating assembly are provided in the feeding area 2-1a, and a third liquid level meter 2-6 is provided in the dipping area 2-1b. The second liquid level meter 2-5, the second viscometer, the second liquid level specific gravity meter, the second thermometer, the third liquid level meter 2-6 and the second heating assembly are respectively connected to the control unit signal, and the control unit controls the process of automatic feeding, coating heating and coating filtering. The second heating assembly is a prior art, such as an electric heater or a heat exchanger, and the utility model will not repeat it.

[0054] In order to further optimize the implementation effect of the utility model, the bottom of the dipping zone 2-1b is arranged inclined upward from one end close to the partition 2-2 to the end away from the partition 2-2, so that the dipping zone 2-1b has different dipping heights, which can adapt to the dipping of sand cores of different sizes, and at the same time facilitate the waste sand that falls during dipping to gather at the bottom of the dipping zone 2-1b.

[0055] In order to further optimize the implementation effect of the utility model, Figure 2As shown, a folding sliding door mechanism 8 is provided at the upper end of the dipping area 2-1b for keeping the dipping area 2-1b in a sealed state, so as to reduce the contact between the paint and the air, reduce the volatilization of the solvent, and reduce the influence of the ambient temperature and humidity on the viscosity of the paint, thereby improving the dipping quality and reducing the pollution to the environment.

[0056] like Figures 3 to 5 As shown, the folding sliding door mechanism 8 includes two sliding door assemblies arranged symmetrically, each sliding door assembly includes a support platform 8-1 arranged at the upper end of the dip coating pool 2-1, a fixed cover 8-2 fixed on the support platform 8-1, at least one mobile cover 8-3 movably arranged relative to the fixed cover 8-2, and a driving component 8-4 for driving the mobile cover 8-3 to move, and the mobile cover 8-3 is arranged on the outer side of the fixed cover 8-2. Preferably, the driving component 8-4 adopts a rodless cylinder, and the driving component 8-4 is connected to the mobile cover 8-3 away from the fixed cover 8-2 by transmission, and the mobile cover 8-3 is pulled to pull the adjacent mobile cover 8-3, thereby opening or closing the folding sliding door. Rubber hoses are correspondingly provided on the contact surfaces of the two mobile covers 8-3 of the two sliding door assemblies for sealing and preventing pinching of hands. Rubber sealing plates are respectively provided between adjacent mobile covers 8-3 and between the mobile cover 8-3 and the fixed cover 8-2.

[0057] In this example, two movable covers 8-3 are provided, namely a first movable cover close to the fixed cover 8-2 and a second movable cover far away from the fixed cover 8-2. The first movable cover is provided outside the fixed cover 8-2, and the second movable cover is provided outside the first movable cover.

[0058] In order to facilitate the arrangement of the fixed cover 8-2 and the movable cover 8-3, the support platform 8-1 is set in a stepped shape, the fixed cover 8-2 is fixed on the upper step, and the two movable covers 8-3 are respectively slidably set on the two lower steps. A guide rail 8-5 is provided on the lower step, and a roller 8-6 that rolls with the guide rail 8-5 is provided at the lower end of the movable cover 8-3, thereby realizing a sliding connection between the movable cover 8-3 and the support platform 8-1.

[0059] In order to facilitate the limiting of the movable cover 8-3 during the movement, as shown in FIG. Figure 6 As shown, a first stopper 9 is provided at one end of the fixed cover 8-2 close to the movable cover 8-3 or on the inner movable cover 8-3, and a stopper 10 cooperating with the first stopper 9 is provided at one end of the movable cover 8-3 close to the fixed cover 8-2 or on the outer movable cover 8-3, as shown in FIG. Figure 7As shown, a second limiting member 11 is provided on the inner side of one end of each movable cover 8-3 away from the fixed cover 8-2. When the driving member 8-4 drives the movable cover 8-3 away from the fixed cover 8-2, the first limiting member 9 and the limiting block 10 cooperate to limit the movable cover 8-3 and the fixed cover 8-2, and the two adjacent movable covers 8-3. When the driving member 8-4 drives the movable cover 8-3 close to the fixed cover 8-2, the second limiting member 11 abuts against the fixed cover 8-2 or the adjacent movable cover 8-3 to play a limiting role.

[0060] The filter module 3 includes a filter pool 3-1, a multi-stage filter component 3-2 and a paint recovery hopper 3-3 arranged from top to bottom. The paint recovery hopper 3-3 is connected to the feed pool 1-1 via a reflux pipe 4. The multi-stage filter component 3-2 can be provided with a variety of filter media to filter the paint to remove impurities in the paint. The filter medium can be detachably arranged for easy replacement.

[0061] In order to facilitate monitoring of the liquid level in the filter tank 3-1, a fourth liquid level meter 3-1a is provided in the filter tank 3-1. The fourth liquid level meter 3-1a is connected to the control unit by signal, and the two discharge ports of the feeding and dipping module 2 are automatically opened and closed by the control unit.

[0062] The working principle of the utility model is:

[0063] The feeding port 1-1a on the feeding tank 1-1 is opened, and the paint raw materials and water are injected into the feeding tank 1-1. After reaching the control upper limit of the first liquid level meter 1-3, mixing is carried out. The first viscometer, the first liquid level specific gravity meter, and the first thermometer detect the viscosity, density, and temperature of the paint. After meeting the requirements, the first valve 1-1b is opened to inject the paint into the feeding area 2-1a until the control upper limit of the second liquid level meter 2-5 is reached. The paint supply module 1 repeats the feeding and mixing operations so that a certain amount of paint is always stored in the feeding tank 1-1.

[0064] The paint in the feeding area 2-1a is injected into the dipping area 2-1b through the feeding pump 2-4. The paint in the dipping area 2-1b overflows to the feeding area 2-1a through the partition 2-2 to keep the paint in the dipping area 2-1b meeting the upper limit control requirement of the third liquid level gauge 2.6, and start the dipping operation. If the second liquid level gauge 2-5 monitors that the paint height is lower than the lower limit, open the first valve 1-1b to replenish the paint to the feeding area 2-1a.

[0065] After a period of dipping operation, the second valve 2-7 and the third valve 2-8 are opened to discharge the waste sand and other impurities deposited in the feeding area and the dipping area 2-1b into the filtering module 3. When the liquid level in the feeding area 2-1a reaches the lower limit controlled by the second liquid level meter 2-5, the first valve 1-1b is opened to replenish the coating that meets the production requirements in the feeding pool 1-1 to the feeding area 2-1a. The fourth liquid level meter 3-1a in the filtering pool 3-1 controls the amount of coating in the filtering pool 3-1. The coating with impurities such as waste sand is intercepted after passing through the multi-stage filtering component 3-2. The impurities are retained, and the paint enters the paint recovery hopper 3-3, and is transported to the feed tank 1-1 through the reflux pipeline 4 and the reflux pump 5. At the same time, the second viscometer and the second liquid level hydrometer detect the viscosity and density of the paint in the feeding area 2-1a. If it does not meet the process requirements, the second valve 2-7 and the third valve 2-8 are repeatedly opened to discharge the paint with impurities to the filter module 3. At the same time, the paint in the feed tank 1-1 that meets the production requirements is added to the feeding area 2-1a until the paint in the feeding area 2-1a meets the standards and the next round of dipping operation is carried out. The temperature of the paint in the feeding area 2-1a is detected by the second thermometer. If it does not meet the requirements, the paint in the feeding area 2-1a is heated to the required temperature by the second heating component.

[0066] When the filter medium of the multi-stage filter assembly 3-2 needs to be replaced, the mixing operation of the paint supply module 1 and the dipping operation of the material adding and dipping module 2 are suspended, and a new round of filtering cycle is started after the filter medium is manually replaced.

[0067] In summary, the working areas in the dipping device are closely connected, and gravity reflux is adopted to reduce energy consumption; the feeding dipping module adopts circulating stirring to avoid coating precipitation, improve coating uniformity, and improve the quality of dipping; the feeding dipping module is detachably arranged in the frame, and different feeding dipping modules can be replaced as needed to adapt to the dipping of different sand cores, thereby improving production flexibility.

[0068] The above examples are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A novel dipping device, characterized in that: include: A coating supply module, used for supplying coating required for dip coating; A feeding and dipping module, which is detachably arranged below the paint supply module, is used to receive the paint and complete the dipping of the product, and includes a feeding area and a dipping area that are separated and arranged, the feeding area is connected to the paint supply module, the dipping area is connected to the feeding area via a feeding pipeline, a feeding pump is provided on the feeding pipeline, and the paint in the dipping area overflows to the feeding area; A filter module is fixedly connected to the paint supply module and is located below the feeding and dipping module, and is used to receive the paint in the feeding area and the dipping area and filter it. The filter module is connected to the paint supply module via a reflux pipeline, and a reflux pump is provided on the reflux pipeline.

2. The novel dip coating device according to claim 1 is characterized in that: The paint supply module includes a material supply tank and an agitator arranged in the material supply tank, the material supply tank is provided with a feeding port connected to an automatic proportioning device and a first heating component, the material supply tank is provided with a first liquid level meter, a first viscometer, a first liquid level specific gravity meter and a first thermometer, the first liquid level meter, the first viscometer, the first liquid level specific gravity meter, the first thermometer, the automatic proportioning device, the first heating component and the agitator are respectively connected to the control unit signal.

3. The novel dip coating device according to claim 2 is characterized in that: A feed port corresponding to the feed area is provided at the bottom of the feed tank, and a first valve connected to the control unit by signal is provided at the feed port.

4. The novel dipping device according to claim 2 is characterized in that: The feeding and dipping module comprises a dipping pool and a partition disposed in the dipping pool, wherein the partition extends in a vertical direction and divides the dipping pool into a feeding area and a dipping area; A first discharge port is provided at the bottom of the feeding zone, and a second valve is provided at the first discharge port. A second discharge port is provided at the bottom of the dipping zone, and a third valve is provided at the second discharge port. The second valve and the third valve are connected to the control unit by signal.

5. The novel dipping device according to claim 4 is characterized in that: The feeding area is provided with a second liquid level meter, a second viscometer, a second liquid level specific gravity meter, a second thermometer and a second heating component, and the dipping area is provided with a third liquid level meter. The second liquid level meter, the second viscometer, the second liquid level specific gravity meter, the second thermometer, the third liquid level meter and the second heating component are respectively connected to the control unit signal.

6. The novel dipping device according to claim 4 is characterized in that: The bottom of the dipping area is arranged upwardly and inclined from an end close to the partition plate to an end away from the partition plate.

7. The novel dip coating device according to claim 4 is characterized in that: A folding sliding door mechanism is provided at the upper end of the dipping area for keeping the dipping area in a sealed state, the folding sliding door mechanism includes two symmetrically arranged sliding door assemblies, the sliding door assembly includes a support platform arranged at the upper end of the dipping pool, a fixed cover fixed on the support platform, at least one movable cover movably arranged relative to the fixed cover, and a driving component for driving the movable cover to move, and the movable cover is arranged on the outer side of the fixed cover.

8. The novel dip coating device according to claim 7 is characterized in that: The support platform is in the shape of a step, the fixed cover is fixedly set on the upper step, and the movable cover is slidably set on the lower step; the fixed cover is close to the end of the movable cover or the movable cover located on the inner side and is provided with a first limiting piece, the movable cover is close to the end of the fixed cover or the movable cover located on the outer side and is provided with a limiting block cooperating with the first limiting piece, and a second limiting piece is provided on the inner side of the end of each movable cover away from the fixed cover.

9. The novel dip coating device according to claim 2 is characterized in that: The filter module comprises a filter pool, a multi-stage filter assembly and a paint recovery hopper which are arranged from top to bottom. The paint recovery hopper is connected to the feed pool via the reflux pipeline.

10. The novel dip coating device according to claim 9 is characterized in that: A fourth liquid level meter is provided in the filter tank, and the fourth liquid level meter is connected to the control unit by signal.

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