A composite pretreatment system for high-temperature heat-resistant powder coating

Abstract

The utility model discloses a kind of composite pretreatment systems for high-temperature heat-resistant powder coating, including alkali cleaning cavity (11) set gradually, pickling cavity (12), pure water rinsing cavity (13) and drying cavity (14), conveying device (2) is through each cavity and is driven workpiece (9) overturn by turnover mechanism (22) overturning;Each cleaning cavity bottom is equipped with independent liquid collecting groove (5), liquid collecting groove (5) is communicated with spray pipeline assembly (3) by circulating pump (6), and cleaning liquid circulation filtration is realized by replaceable filter unit (4);Drying cavity (14) is arranged hot air flue (7) up and down, outlet is equipped with adjustable flow guide plate (71), forms vortex to improve drying uniformity.This system realizes multi-section independent cleaning, all-around spraying and high-efficiency drying, improves powder coating adhesion and durability.

Description

Technical Field

[0001] This utility model relates to the field of powder coating equipment, specifically to a composite pretreatment system for high-temperature heat-resistant powder coatings. Background Technology

[0002] Heat-resistant powder coatings are widely used for surface treatment of products such as engine housings, exhaust pipes, oven cavities, and high-power lamp housings. These powder coatings require high temperatures during curing and demand strict requirements on the cleanliness and adhesion of the substrate surface. Inadequate pretreatment can easily lead to blistering, peeling, or insufficient adhesion of the coating.

[0003] The existing powder coating pretreatment equipment mainly suffers from the following problems: First, most of them adopt a single tank series process, which makes it easy for the liquid to cross-mix between the tanks, affecting the treatment effect; Second, the workpieces are mostly in a fixed position during the transportation process, resulting in many dead corners in the spray coverage and incomplete local cleaning; Third, the cleaning liquid has serious impurity deposition, and it is inconvenient to replace or filter it, resulting in long downtime; Fourth, most of the drying devices are unidirectional hot air, which results in insufficient drying uniformity and high energy consumption.

[0004] Therefore, an innovative composite pretreatment system is needed to address the above shortcomings and improve the pretreatment quality and efficiency of high-temperature heat-resistant powder coating. Utility Model Content

[0005] The purpose of this invention is to provide a composite pretreatment system for high-temperature heat-resistant powder coatings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A composite pretreatment system for high-temperature heat-resistant powder coatings, characterized in that it comprises:

[0008] The pretreatment chamber group includes an alkaline washing chamber, an acid washing chamber, a pure water rinsing chamber, and a drying chamber arranged sequentially along the conveying path. Sealing partitions and transition buffers are provided between adjacent chambers to prevent liquid or mist from mixing.

[0009] The conveying device is installed through the lower part of the pretreatment chamber assembly and is equipped with a hanger for hanging the workpiece. During the conveying process, the hanger is driven by a flipping mechanism to realize the periodic flipping of the workpiece so as to ensure that all surfaces of the workpiece can be treated by spraying or hot air.

[0010] The spray pipeline assembly is arranged above and on both sides of the alkaline washing chamber, the acid washing chamber and the pure water rinsing chamber. Its nozzles are connected to the end of the pipeline through ball joints. It is equipped with a fastening knob on the outside. The nozzle angle can be adjusted after the knob is loosened.

[0011] The bottom of the alkaline washing chamber, acid washing chamber and pure water rinsing chamber is provided with an independent collection tank. Each collection tank is provided with multiple sedimentation separation plates and has a slag discharge port at the bottom. The upper clear liquid is returned to the corresponding spray pipeline assembly through a circulation pump.

[0012] The filter unit is located on the outside of the cavity and adopts a drawer-type plug-in structure. It has a replaceable filter element inside, and the pore size of the filter element is in the range of 10 to 100 μm. The filter unit has differential pressure detection ports at the inlet and outlet to monitor the filter element clogging.

[0013] The drying chamber has hot air ducts at its top and bottom. A guide plate is provided at the outlet of the hot air duct, and the guide plate is connected to a knob on the outer wall of the chamber via an adjusting rod to adjust the angle of the guide plate so that the hot air forms a direct blowing or vortex airflow on the surface of the workpiece.

[0014] The control device includes a PLC module electrically connected to a temperature sensor, a flow sensor, and a speed sensor, and is used to adjust the operating parameters of the circulating pump, the conveying device, and the hot air duct according to the sensor detection signals.

[0015] Furthermore, the conveying device is a chain conveyor line, and the flipping mechanism includes a chain cam and a shift fork, which can periodically shift the hanger during the conveying process to achieve a 180° flip of the workpiece.

[0016] Furthermore, the nozzle angle adjustment range is 0° to 45°, which can be achieved by manual adjustment and tightening via a knob; in an automated solution, the nozzle can also be automatically adjusted via a motor-driven bracket.

[0017] Furthermore, the filter element is made of ceramic or high-polymer heat-resistant filter mesh to meet the requirements for use in strong acid and alkali environments and high-temperature environments.

[0018] Furthermore, the multi-layer sedimentation separation plates of the liquid collection tank are arranged in a stepped manner, allowing larger particles of sediment to slide down the stepped separation plates to the slag discharge port.

[0019] Furthermore, the drying chamber adopts a double-layer heat-insulating shell, with the outer layer filled with heat-insulating material.

[0020] Furthermore, the guide plate forms a direct airflow in a horizontal state and a vortex airflow in an inclined state, thereby adapting to the drying requirements of workpieces of different shapes.

[0021] Furthermore, the control device is equipped with a human-machine interface for interaction with the operator, used to input workpiece parameters or adjust process settings.

[0022] Furthermore, the hanger adopts a detachable slot structure to facilitate quick replacement of clamping components for workpieces of different shapes.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. This high-temperature heat-resistant powder coating composite pretreatment system, through the design of independent liquid collection tank and multi-layer sedimentation separation plate, effectively avoids cross-contamination of the cleaning solution, extends the service life of the cleaning solution, and reduces the frequency of downtime for liquid replacement.

[0025] 2. This high-temperature heat-resistant powder coating composite pretreatment system, through the combination of a flipping conveyor and an all-round spraying structure, ensures the uniformity of workpiece surface cleaning and drying, and significantly improves the adhesion and durability of the powder coating. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the composite pretreatment system of this utility model;

[0027] Figure 2 This is a schematic diagram of the pretreatment chamber assembly and independent liquid collection tank.

[0028] Figure 3 This is a schematic diagram of the connection structure between the spray piping assembly and the filter unit;

[0029] Figure 3A This is a schematic diagram of the internal structure and liquid flow of the filtration unit.

[0030] Figure 4 This is a schematic diagram of the tilting conveyor device.

[0031] Figure 5 A schematic diagram of the drying chamber and guide vane arrangement;

[0032] Figure 5A This is a cross-sectional view of the deflector adjustment mechanism;

[0033] Figure 6 This is a control logic block diagram of the control device.

[0034] In the picture:

[0035] 1. Pretreatment chamber assembly; 11. Alkali washing chamber; 12. Acid washing chamber; 13. Pure water rinsing chamber; 14. Drying chamber;

[0036] 2. Conveying device; 21. Hanger; 22. Tilting mechanism;

[0037] 3. Spray piping assembly; 31. Side spray pipes; 32. Top spray pipes;

[0038] 4. Filter unit; 41. Filter element; 42. Differential pressure detection port;

[0039] 5. Liquid collection tank; 51. Sedimentation separation plate; 52. Slag discharge port;

[0040] 6. Circulating pump;

[0041] 7. Hot air duct; 71. Deflector plate; 72. Knob; 73. Adjusting rod;

[0042] 8. Control device; 81. PLC module; 82. Temperature sensor; 83. Flow sensor; 84. Speed ​​sensor; 85. Human-machine interface;

[0043] 9. Workpiece. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0046] like Figure 1 As shown, a composite pretreatment system for high-temperature heat-resistant powder coatings includes a pretreatment chamber assembly 1, a conveying device 2, a spray pipeline assembly 3, a filter unit 4, a liquid collection tank 5, a circulating pump 6, a hot air duct 7, a control device 8, and a workpiece 9. The entire system is supported by a steel structure frame, and the conveying device 2 runs horizontally through each chamber to achieve continuous conveying of the workpiece 9.

[0047] The pretreatment chamber assembly 1 is arranged sequentially along the conveying direction, including an alkaline washing chamber 11, an acid washing chamber 12, a pure water rinsing chamber 13, and a drying chamber 14. Adjacent chambers are separated by sealing partitions, and the top is equipped with an exhaust port and the bottom is equipped with a drainage groove to prevent liquid or mist from mixing. An air hood is installed between the acid washing chamber 12 and the pure water rinsing chamber 13 to prevent acid mist from entering the rinsing area. A drying area is set between the pure water rinsing chamber 13 and the drying chamber 14, and a high-pressure air knife is arranged in the drying area to remove residual water droplets on the surface of the workpiece 9 before it enters the drying chamber 14.

[0048] like Figure 2As shown, the bottom of the alkaline washing chamber 11, the acid washing chamber 12, and the pure water rinsing chamber 13 are each equipped with an independent collection tank 5. Each collection tank 5 has multiple layers of sedimentation separation plates 51 arranged inside to achieve the step-by-step sedimentation of impurities. A slag discharge port 52 is provided at the bottom to periodically discharge slag. The spray liquid flows down the surface of the workpiece 9 into the corresponding collection tank 5, is returned to the spray pipeline assembly 3 by the circulation pump 6, and is filtered by the external filter unit 4.

[0049] like Figure 3 and Figure 3A As shown, filter unit 4 adopts a drawer-type structure with a corrosion-resistant stainless steel shell. It contains a removable filter element with a pore size ranging from 10 to 100 μm, used to intercept suspended particles, achieving a filtration efficiency of no less than 90%. For high-precision applications, a 5 μm ceramic filter element can be selected. Differential pressure detection ports are installed at the inlet and outlet of filter unit 4. A replacement prompt is issued when the differential pressure exceeds a set threshold. The liquid flow direction is: liquid inlet → filter element outer wall → through filter element → outlet.

[0050] like Figure 3 As shown, the spray piping assembly 3 includes a top spray pipe 32 and a side spray pipe 31. Nozzles are installed at the ends of the piping via ball joints and are equipped with external fastening knobs. The spray angle can be adjusted manually by loosening the knobs, with an adjustment range of 0° to 45°. In an automated solution, a motor-driven bracket can be used to automatically adjust the nozzle angle. Adjusting the nozzle angle optimizes the spray coverage area based on the complexity of the workpiece 9's shape, reducing cleaning dead zones.

[0051] like Figure 4 As shown, the conveying device 2 is a chain conveyor line, and the hanger 21 is used to hang the workpiece 9. During the conveying process, the flipping mechanism 22 drives the shift fork on the chain to periodically move the hanger 21, causing the workpiece 9 to flip 180°, so that the inner and outer surfaces of the workpiece 9 are evenly exposed to the spray liquid and hot air.

[0052] After cleaning, the workpiece 9 sequentially enters the pickling chamber 12 and the pure water rinsing chamber 13, and finally enters the drying chamber 14. Figure 5 and Figure 5A As shown, the drying chamber 14 has hot air ducts 7 arranged vertically. A guide plate 71 is provided at the duct outlet, and the guide plate 71 is connected to an external knob 72 via an adjusting rod. The operator can change the angle of the guide plate 71 by rotating the knob 72. When the guide plate 71 is horizontal, the airflow is in a direct blowing mode, suitable for large flat workpieces. When the guide plate 71 is tilted, the hot air is deflected by the guide plate 71 and forms a ring-shaped rotating flow field on the surface of the workpiece 9, enhancing the heat exchange and turbulence between the airflow and the workpiece surface, thus achieving uniform drying in grooved or complex-shaped workpieces. The drying chamber 14 uses a double-layer heat-insulating shell; the inner layer maintains a high temperature, while the outer layer is filled with heat-insulating material to reduce energy consumption.

[0053] like Figure 6As shown, the control device 8 includes a PLC control module, a temperature sensor, a flow sensor, and a speed sensor. The PLC collects signals from each sensor and performs closed-loop regulation according to set parameters: when a decrease in spray flow is detected, the speed of the circulating pump 6 is automatically increased; when the drying temperature is detected to be too low, the heating power of the hot air duct 7 is automatically increased; when the size of the workpiece 9 is detected to be too large, the chain speed of the conveyor device 2 is reduced to extend the processing time. The system can also be manually intervened by setting parameters through a human-machine interface.

[0054] The operating flow of this embodiment is as follows: After being hung by the hanger 21, the workpiece 9 enters the alkaline washing chamber 11 to remove surface oil stains → enters the acid washing chamber 12 to remove oxide scale → enters the pure water rinsing chamber 13 to remove residual acid → passes through the air knife in the drying zone to remove residual liquid → enters the drying chamber 14 and is rapidly dried under the action of guided hot air. Throughout the process, the workpiece 9 is processed at multiple angles through the flipping mechanism 22, and the cleaning solution is recycled through sedimentation in the collection tank 5, filtration by the filter unit 4, and return by the circulation pump 6.

[0055] This invention effectively improves the adhesion and durability of high-temperature heat-resistant powder coatings through a combination of multi-stage independent cleaning, flip spraying, fine filtration, vortex drying, and intelligent control, ensuring the reliability and adaptability of the system under complex workpiece processing conditions.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A composite pretreatment system for high-temperature heat-resistant powder coatings, characterized in that, include: The pretreatment chamber group (1) is provided with an alkaline washing chamber (11), an acid washing chamber (12), a pure water rinsing chamber (13) and a drying chamber (14) in sequence along the conveying path. A sealing partition and a transition buffer are provided between adjacent chambers to prevent liquid or mist from flowing together. The conveying device (2) is installed through the pretreatment cavity group (1) and is provided with a hanger (21) for hanging the workpiece (9). During the conveying process, the hanger (21) is driven by a flipping mechanism (22) to realize the periodic flipping of the workpiece (9) so as to ensure that each surface of the workpiece (9) can be treated by spraying or hot air. Spray pipeline assembly (3) is arranged above and on both sides of the alkaline washing chamber (11), the acid washing chamber (12) and the pure water rinsing chamber (13). Its nozzles are connected to the end of the pipeline through ball joints. A fastening knob is provided on the outside. The nozzle angle can be adjusted after the knob is loosened. The bottom of the alkaline washing chamber (11), acid washing chamber (12) and pure water rinsing chamber (13) is provided with an independent collection tank (5). Each collection tank (5) is provided with a multi-layer sedimentation separation plate (51) and a slag discharge port (52) at its bottom. The upper clear liquid is returned to the corresponding spray pipeline assembly (3) through the circulation pump (6). The filter unit (4) is located on the outside of the cavity and adopts a drawer-type plug-in structure. It is equipped with a replaceable filter element (41) inside. The pore size of the filter element (41) is 10 to 100 μm. The inlet and outlet of the filter unit (4) are equipped with differential pressure detection ports (42) for monitoring the filter element blockage. A drying chamber (14) is provided with hot air ducts (7) at the top and bottom of the drying chamber (14). A guide plate (71) is provided at the outlet of the hot air duct (7). The guide plate (71) is connected to a knob (72) on the outer wall of the chamber through an adjustment rod so as to adjust the angle of the guide plate so that the hot air forms a direct blowing or vortex airflow on the surface of the workpiece (9). The control device (8) includes a PLC module (81) which is electrically connected to a temperature sensor (82), a flow sensor (83) and a speed sensor (84) and is used to adjust the operating parameters of the circulating pump (6), the conveying device (2) and the hot air duct (7) according to the sensor detection signals.

2. The composite pretreatment system according to claim 1, characterized in that, The conveying device (2) is a chain conveyor line, and the flipping mechanism (22) includes a chain cam and a shift fork, which can periodically move the hanger (21) during the conveying process to achieve a 180° flip of the workpiece (9).

3. The composite pretreatment system according to claim 1, characterized in that, The nozzle angle can be adjusted from 0° to 45°, and can be manually adjusted and tightened by a knob; in an automated solution, the nozzle can also be automatically adjusted by a motor-driven bracket.

4. The composite pretreatment system according to claim 1, characterized in that, The filter element (41) is made of ceramic or high-polymer heat-resistant filter mesh to meet the requirements for use in strong acid and alkali and high temperature environments.

5. The composite pretreatment system according to claim 1, characterized in that, The multi-layer sedimentation separation plates (51) of the liquid collection tank (5) are arranged in a stepped manner, so that larger particles of sediment slide down the stepped separation plates (51) to the slag discharge port (52).

6. The composite pretreatment system according to claim 1, characterized in that, The drying chamber (14) adopts a double-layer heat-insulating shell, with the outer layer filled with heat-insulating material.

7. The composite pretreatment system according to claim 1, characterized in that, The guide plate (71) forms a direct airflow in a horizontal state and a vortex airflow in an inclined state, thereby adapting to the drying requirements of workpieces (9) of different shapes.

8. The composite pretreatment system according to claim 1, characterized in that, The control device (8) is equipped with a human-machine interface (85) for interaction with the operator, used to input workpiece parameters or adjust process settings.

9. The composite pretreatment system according to claim 1, characterized in that, The hanger (21) adopts a detachable slot structure to quickly change the clamping parts of workpieces (9) of different shapes.

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