A pre-treatment process with an atmospheric filtration integrated system

Abstract

The application discloses a kind of normal pressure filtration integrated systems for pretreatment procedure, including normal pressure tank body, support partition, porous separation unit, quick-release fastener and drainage driving source.The top of normal pressure tank body is provided with an open mouth;Support partition is movably arranged in the inside of normal pressure tank body and separates into filtrate buffer cavity and clean liquid collection cavity;Porous separation unit is communicated with the upper and lower two cavities;Quick-release fastener is used to fix porous separation unit;Drainage driving source is communicated with the lower part of normal pressure tank body to generate negative pressure.The application adopts the mechanism of top normal pressure gravity infiltration combined with bottom negative pressure suction, uses quick-release fastener to cooperate with normal pressure environment, replaces traditional pressure flange structure, realizes the tool-free rapid disassembly of filter consumables, and eliminates the impact damage risk of high-pressure fluid on filter material.

Description

Technical Field

[0001] This invention relates to the field of mechanical technology for pre-treatment of coating in automobile and equipment manufacturing, and more specifically, to an integrated atmospheric pressure filtration system for pre-treatment processes. Background Technology

[0002] In the continuous pretreatment process before painting automotive bodies or large mechanical components, the treatment bath inevitably mixes with a large amount of metal shavings, welding slag, and chemical reaction residues when rinsing the workpieces. To prevent these solid particles from causing surface defects such as coating blistering or adhesion degradation in subsequent processes, it is usually necessary to install slag removal equipment in the pipeline to continuously circulate and filter the bath solution.

[0003] Currently available atmospheric pressure filtration solutions in China include: ① Simple atmospheric pressure filtration device: It adopts the structure of stainless steel straight pipe + ordinary filter bag / filter screen, which is directly connected in series in the return pipeline of the pretreatment tank liquid, and relies on the gravity of the tank liquid to achieve atmospheric pressure filtration.

[0004] ② Split-type atmospheric pressure filtration system: It is composed of independent filter cartridges, manual ball valves, and ordinary pipelines. It is only equipped with a simple filter screen and does not integrate functions such as impurity separation, flow regulation, and self-cleaning. The components are scattered and there is no integrated design, making installation and maintenance cumbersome.

[0005] The disadvantages of existing technologies are as follows: ① Insufficient filtration accuracy and cleanliness; ② Poor structural adaptability and insufficient adjustability; ③ Poor maintainability and stability; ④ Low integration and large space occupation. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention discloses an integrated atmospheric pressure filtration system for pretreatment processes, which solves the technical problems of existing atmospheric pressure filtration equipment, such as the rigid fixed support structure, which easily leads to localized clogging and swelling of filter bags and the difficulty of stopping down for replacement and disassembly.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides an integrated atmospheric pressure filtration system for a pretreatment process, comprising: an atmospheric pressure tank, a supporting partition, a porous separation unit, quick-release fasteners, and a drainage drive source; the top of the atmospheric pressure tank is open; the supporting partition is disposed inside the atmospheric pressure tank, dividing the interior of the atmospheric pressure tank into an upper buffer chamber for filtrate and a lower collection chamber for purified liquid; the porous separation unit is disposed on the supporting partition and connects the buffer chamber for filtrate and the collection chamber for purified liquid; the quick-release fasteners are disposed on the supporting partition to keep the porous separation unit in a fixed state; the drainage drive source is connected to the lower part of the atmospheric pressure tank to generate negative pressure in the collection chamber for purified liquid and drive liquid to permeate from top to bottom through the porous separation unit.

[0008] Preferably, the supporting partition is movably disposed inside the atmospheric pressure tank, the supporting partition has an installation through hole, the multi-hole separation unit is inserted into the installation through hole, and the quick-release fastener is disposed close to the installation through hole.

[0009] Preferably, the porous separation unit includes a filter basket and a filter bag fitted inside the filter basket. The top opening edge of the filter basket is folded outward horizontally to form an annular flange. The bottom surface of the annular flange overlaps the upper surface of the support partition. The bag opening edge of the filter bag is folded outward and laid flat above the annular flange. The quick-release fastener is used to press the bag opening of the filter bag downward.

[0010] Preferably, the top opening of the atmospheric pressure tank is provided with a top cover plate.

[0011] Preferably, the quick-release fastener is an elbow-type quick-release buckle assembly, and a buckle base is welded on the support partition. The elbow-type quick-release buckle assembly is installed on the buckle base, and the pressure tongue end of the elbow-type quick-release buckle assembly faces the annular flange.

[0012] Preferably, the inner wall of the atmospheric pressure tank is provided with a side support to keep the support partition in a suspended state.

[0013] Preferably, the bottom of the lower side wall of the atmospheric pressure tank is provided with a liquid outlet, and the bottom of the clean liquid collection chamber has a V-shaped guide plate that slopes downward toward the liquid outlet.

[0014] Preferably, the angle between the inclined surface of the V-shaped guide plate and the horizontal plane is 15° to 22°.

[0015] Preferably, linear guide ribs are provided at equal intervals parallel to each other on the inclined surface of the V-shaped guide plate along the direction of water flow.

[0016] As can be seen from the above technical solutions, the embodiments of this application have at least the following beneficial effects: By dividing the internal chambers with supporting partitions, the traditional positive pressure forced pressurization filtration mode is reconstructed into a spatial flow field combination of upper atmospheric pressure infiltration and lower negative pressure suction. The top of the atmospheric pressure tank maintains an open atmospheric pressure environment, eliminating the mechanical stress requirements of multiple locking bolts and pressure-bearing flanges, allowing quick-release fasteners to be safely installed, thereby significantly reducing the replacement time and operational intensity of consumables; at the same time, the gently flowing liquid to be filtered under atmospheric pressure greatly alleviates the positive physical impact on the porous separation unit, eliminating the risk of filter bags being punctured by impurities under high-pressure unidirectional extrusion, and improving the long-term operational stability of the system. The V-shaped guide plate with a specific inclination angle, combined with the linear guide ribs, forms a dynamic wall-hugging cleaning water flow under the lower negative pressure suction condition, greatly improving the anti-sludge self-cleaning capability of the system tank bottom. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a front view of the atmospheric pressure filtration integrated system for the pretreatment process of the present invention; Figure 2 This is a top view of the atmospheric pressure filtration integrated system for the pretreatment process of the present invention (top cover plate not shown). Figure 3 This is a side view of the atmospheric pressure filtration integrated system for the pretreatment process of the present invention.

[0019] In the diagram: 1. Atmospheric pressure tank; 2. Supporting partition; 3. Porous separation unit; 4. Quick-release fastener; 5. Drainage drive source; 10. Top cover plate; 11. Outlet; 12. V-shaped guide plate; 13. Side support; 21. Buffer chamber for filtrate; 22. Clean liquid collection chamber; 31. Filter basket; 32. Filter bag; 33. Annular flange; 41. Hook and loop base; 42. Pressure tongue. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0021] See appendix Figures 1 to 3As shown, this embodiment discloses an integrated atmospheric pressure filtration system for a pretreatment process. Its main mechanical structure includes an atmospheric pressure tank 1, a supporting partition 2, a porous separation unit 3, quick-release fasteners 4, and a drainage drive source 5. The top of the atmospheric pressure tank 1 is open. The supporting partition 2 is disposed inside the atmospheric pressure tank 1, dividing the interior into an upper buffer chamber 21 for the filtrate and a lower clean liquid collection chamber 22. The porous separation unit 3 is disposed on the supporting partition 2 and connects the buffer chamber 21 for the filtrate and the clean liquid collection chamber 22. The quick-release fasteners 4 are disposed on the supporting partition 2 to keep the porous separation unit 3 in a fixed state. The drainage drive source 5 is connected to the lower part of the atmospheric pressure tank 1 to generate negative pressure in the clean liquid collection chamber 22 and drive the liquid to permeate from top to bottom through the porous separation unit 3.

[0022] In the embodiments of this application, the passive low-pressure differential circulation channel is formed by the atmospheric pressure self-flowing percolation at the top of the atmospheric pressure tank 1 and the negative pressure suction of the bottom drainage drive source 5. It does not require the front-end high-pressure water pump to force pressure, thus solving the hidden danger of high-speed direct impact of slag-containing fluid on the filter structure from the power source.

[0023] Understandably, the drain drive source 5, as the core actuator for the system's bottom-level suction power and fluid transport, can be a reflux pump, considering the actual working conditions of the tank liquid circulation filtration in the pretreatment process. In terms of physical connection, the inlet of the drain drive source 5 is sealed to the outlet 11 at the bottom of the lower side wall of the atmospheric pressure tank 1 via an external flange pipe, while its drain end is connected to the circulation reflux network of the main pretreatment tank, thus returning the filtered liquid to the main tank to form a continuous micro-circulation of filtration. When the drain drive source 5 starts operating, the high-speed rotation of its internal operating components continuously generates a stable and strong negative pressure suction force within the clean liquid collection chamber 22. This suction negative pressure not only provides a downward flexible traction force for the liquid to be filtered to overcome the slight flow resistance of the porous separation unit 3, but also, combined with the hydrostatic pressure head of the liquid level in the upper buffer chamber 21, maintains a continuous and stable top-down permeation flow field. For example, in specific working conditions where there are highly corrosive acid and alkali baths or strict explosion-proof requirements in the pre-treatment workshop for coating, the return pump, which serves as the drain drive source 5, can be replaced by a positive displacement pump such as a pneumatic diaphragm pump or a screw pump to further enhance the mechanical durability of the entire suction power system in harsh industrial environments.

[0024] To facilitate long-term maintenance and cleaning of the equipment's interior, a side support 13 is fixedly installed on the inner wall of the atmospheric pressure tank 1. The side support 13 ensures that the support partition 2 remains stably suspended. Based on the flat support of the side support 13, the support partition 2 is movably positioned inside the atmospheric pressure tank 1. When annual shutdown for sludge removal is required, maintenance personnel can lift the entire support partition 2, along with its components, directly upwards, greatly facilitating cleaning operations in the lower-level collection space. Simultaneously, a through-hole is provided on the support partition 2, into which a multi-hole separation unit 3 is inserted vertically. Quick-release fasteners 4 are positioned near the edge of the through-hole.

[0025] It should be noted that the porous separation unit 3, as the core component for intercepting impurities, specifically includes a filter basket 31 and a filter bag 32 fitted inside the filter basket 31. The filter basket 31, as the outer rigid load-bearing frame, has an annular flange 33 integrally formed by horizontally folding its top opening edge outwards. During assembly, the lower surface of the annular flange 33 directly overlaps the upper surface of the supporting partition 2, using gravity to achieve stable vertical positioning. After the filter bag 32 is nested into the inner cavity of the filter basket 31, its flexible bag opening edge folds outwards and lies flat directly above the annular flange 33. During system operation, the outward radial thrust generated by the filter bag 32 during liquid permeation is offset by the rigid sidewall of the filter basket 31, effectively preventing the filter bag 32 from bursting under pressure.

[0026] To ensure a leak-proof seal at the end face of the filter bag 32 under normal pressure conditions without the pressure flange, a quick-release fastener 4 is used to press the bag opening of the filter bag 32 downwards and tightly against the annular flange 33. Specifically, the quick-release fastener 4 is an elbow-clamp type quick-lock assembly. Correspondingly, a latch base 41 is pre-welded and fixed to the support partition 2. The elbow-clamp type quick-lock assembly is securely installed on the latch base 41, with the forward-extending pressure tongue 42 of the elbow-clamp type quick-lock assembly facing the annular flange 33 and the bag opening of the filter bag 32 laid flat above it. The operator only needs to press down the latch handle with one hand; after the linkage mechanism crosses the mechanical dead point, the structure self-locks, forcing the pressure tongue 42 to output an elastic vertical clamping force downwards. This elbow-clamp system completely eliminates the risk of traditional threaded fasteners rusting and jamming due to acid and alkali vapor corrosion, achieving extremely simple one-button tool-free disassembly.

[0027] In addition, to further optimize the working environment and prevent workshop dust from falling into the filtrate, an upper cover plate 10 is provided at the top opening of the atmospheric pressure tank 1. Since the buffer chamber 21 of the filtrate is in an atmospheric pressure state that is open to the atmosphere, the upper cover plate 10 can be laid flat and covered by its own weight, without the need for any additional locking structure.

[0028] It should be noted that under normal pressure and slow flow conditions, fine metal powder particles can easily penetrate the filter bag 32 and settle in the dead corners of the flat-bottomed container, leading to localized deposition and under-deposit corrosion. To specifically address this secondary hydrodynamic problem, an outlet 11 is provided at the bottom of the lower side wall of the normal pressure tank 1. In conjunction with the outlet 11, the bottom of the clean liquid collection chamber 22 is specifically constructed with a V-shaped guide plate 12 that slopes downwards towards the outlet 11. Considering both the vertical space occupancy of the equipment and the hydrodynamics of slag discharge, the angle between the inclined surface of the V-shaped guide plate 12 and the horizontal plane is strictly controlled to be between 15° and 22°. This inclination design ensures that small particles overcome static friction and slide downwards, while effectively preventing the overall height of the normal pressure tank 1 from being excessively increased.

[0029] Furthermore, linear guide ribs are provided at equal intervals along the direction of water flow on the inclined surface of the V-shaped guide plate 12. When the discharge drive source 5 continuously draws liquid through the outlet 11, the specific inclination angle combined with the physical converging and guiding effect of the linear guide ribs on the fluid allows the negative pressure water flow at the bottom of the clean liquid collection chamber 22 to form a continuous, wall-adhering cleaning jet on the inclined surface of the V-shaped guide plate 12. This wall-adhering flow forcefully breaks the static settling boundary layer conditions of fine impurity particles, keeping them dynamically suspended and smoothly discharged with the fluid, greatly enhancing the anti-sludge self-cleaning ability of the system's bottom tank, thereby effectively extending the service life of the complete pretreatment equipment.

[0030] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. An integrated atmospheric pressure filtration system for a pretreatment process, characterized in that, include: Atmospheric pressure tank (1), support partition (2), porous separation unit (3), quick-release fastener (4) and drain drive source (5); The top of the atmospheric pressure tank (1) is open; The support partition (2) is disposed inside the atmospheric pressure tank (1), and the support partition (2) divides the interior of the atmospheric pressure tank (1) into an upper buffer chamber (21) for the liquid to be filtered and a lower collection chamber (22) for the liquid to be collected. The porous separation unit (3) is disposed on the support partition (2), and the porous separation unit (3) connects the filter buffer chamber (21) and the purified liquid collection chamber (22). The quick-release fastener (4) is provided on the support partition (2) to keep the porous separation unit (3) in a fixed state; The drain drive source (5) is connected to the lower part of the atmospheric pressure tank (1) to generate negative pressure in the clean liquid collection chamber (22) and drive the liquid to permeate from top to bottom through the porous separation unit (3).

2. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 1, characterized in that, The support partition (2) is movably disposed inside the atmospheric pressure tank (1). The support partition (2) has an installation through hole. The multi-hole separation unit (3) is inserted into the installation through hole. The quick-release fastener (4) is disposed close to the installation through hole.

3. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 2, characterized in that, The porous separation unit (3) includes a filter basket (31) and a filter bag (32) fitted inside the filter basket (31). The top opening edge of the filter basket (31) is folded outward horizontally to form an annular flange (33). The bottom surface of the annular flange (33) overlaps the upper surface of the support partition (2). The bag opening edge of the filter bag (32) is folded outward and laid flat above the annular flange (33). The quick-release fastener (4) is used to press the bag opening of the filter bag (32) downward.

4. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 1, characterized in that, The top opening of the atmospheric pressure tank (1) is provided with a top cover plate (10).

5. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 3, characterized in that, The quick-release fastener (4) is an elbow-type quick-release fastener assembly. A fastener base (41) is welded on the support partition (2). The elbow-type quick-release fastener assembly is installed on the fastener base (41). The pressure tongue (42) end of the elbow-type quick-release fastener assembly is directly opposite the annular flange (33).

6. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 1, characterized in that, The inner wall of the atmospheric pressure tank (1) is provided with a side support (13) to keep the support partition (2) suspended.

7. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 1, characterized in that, The lower side wall of the atmospheric pressure tank (1) is provided with a liquid outlet (11), and the bottom of the clean liquid collection chamber (22) has a V-shaped guide plate (12) that slopes downward toward the liquid outlet (11).

8. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 7, characterized in that, The angle between the inclined surface of the V-shaped guide plate (12) and the horizontal plane is 15° to 22°.

9. The atmospheric pressure filtration integrated system for a pretreatment process according to claim 7, characterized in that, The V-shaped guide plate (12) has linear guide ribs that are equidistantly parallel to each other on the inclined surface along the direction of water flow.

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