A high-efficiency dewatering method and a belt vacuum flat plate filter pressing system for flaky pearlescent pigments

Abstract

The application discloses a kind of efficient dewatering method and belt vacuum flat plate filter pressing system for sheet-shaped pearlescent pigment, mainly related to the technical field of pigment production equipment, including rack, filter belt, feeding distribution unit, belt vacuum flat plate filtering unit, squeezing and shaping unit, filter belt tension adjusting unit, filter belt regeneration unit and electric control box, when dewatering, pearlescent pigment slurry is evenly spread on filter belt by uniform hopper and distributed distributor, first by vacuum flat plate filtering unit negative pressure to remove free water, then by gradient flexible squeezing roller group to remove capillary water in depth, while protecting the morphology of sheet-shaped particles, efficient dewatering is realized;Filter belt is recycled after tension correction and cleaning and blowing regeneration, the application uses vacuum suction filtration and gradient squeezing composite process, continuous automatic operation, high dewatering efficiency, low filter cake moisture content, can effectively avoid pearlescent pigment particle breakage, improve product quality and production stability, adapt to sheet-shaped pearlescent pigment industrialization continuous production demand.

Description

Technical Field

[0001] This invention relates to the technical field of pigment production equipment, specifically to an efficient dehydration method for flake pearlescent pigments and a belt vacuum plate filter press system. Background Technology

[0002] Pearl pigments, as functional pigments with high gloss and decorative effects, are widely used in coatings, plastics, cosmetics, inks and other fields. Their lamellar crystal structure is the core factor determining the pearlescent effect and product quality. In the industrial production process of lamellar pearl pigments, slurry dewatering is a key process that directly affects production efficiency, product qualification rate and subsequent processing costs. At present, the industry generally uses conventional dewatering equipment such as plate and frame filter presses, vacuum drum filters and ordinary belt presses. Although they can achieve basic solid-liquid separation, they have obvious limitations in adapting to the characteristic production needs of lamellar pearl pigments. It is difficult to achieve both efficient dewatering and particle morphology protection, which has become the main bottleneck restricting the improvement of production quality and efficiency.

[0003] In practical applications, conventional dewatering equipment either operates intermittently, resulting in low processing efficiency and cumbersome unloading and cleaning processes, making it unsuitable for continuous large-scale production; or it suffers from unstable vacuum and poor material uniformity, leading to uneven filter cake thickness and incomplete dewatering, which significantly increases subsequent drying energy consumption. More importantly, ordinary pressing devices often use rigid constant pressure extrusion, lacking gradient and flexibility in pressure control, which easily causes the flake pearlescent pigment particles to break and the crystal surface to be damaged, directly reducing the product's gloss and quality grade. At the same time, existing equipment generally suffers from problems such as filter belt misalignment and loosening, incomplete cleaning and regeneration, and easy clogging of the filter screen, which not only affect the stability of continuous operation but also increase equipment maintenance and consumable costs. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an efficient dehydration method for flake pearlescent pigments and a belt vacuum plate filter press system to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An efficient dehydration method for flake pearlescent pigments includes the following steps:

[0007] Step 1: The pearlescent pigment slurry is fed into the uniform hopper, and after being stabilized by the weir plate, it is evenly spread on the upper surface of the filter belt by the distributed distributor. The filter belt is circulated under the drive of the active roller.

[0008] Step 2: The filter belt with slurry spread into the belt vacuum plate filter unit, where vacuum filtration and dewatering are completed under the negative pressure of the vacuum box;

[0009] Step 3: The initially dehydrated filter cake enters the pressing and shaping unit along the filter belt, where it is subjected to gradient flexible pressure from the pressing rollers to remove capillary water.

[0010] Step 4: The dehydrated filter cake is bent and peeled off at the discharge end of the pressing and shaping unit for unloading. After unloading, the filter belt enters the filter belt tension adjustment unit for tension correction, and then enters the filter belt regeneration unit.

[0011] Step 5: The filter belt enters the filter belt regeneration unit for cleaning and purging regeneration, and then returns to the feed end for cyclic operation.

[0012] A belt vacuum plate filter press system for flake pearlescent pigments includes a frame, a filter belt, a feeding and spreading unit, a belt vacuum plate filter unit, a pressing and shaping unit, a filter belt tension adjustment unit, a filter belt regeneration unit, and an electrical control box. The feeding and spreading unit is located above the frame, the belt vacuum plate filter unit is located behind the feeding and spreading unit and is located inside the frame, the pressing and shaping unit is located behind the belt vacuum plate filter unit, the filter belt tension adjustment unit is located below the pressing and shaping unit, the filter belt regeneration unit is located on the side of the pressing and shaping unit near the feeding end, and the electrical control box is located on one side of the frame.

[0013] Preferably, the pressing and shaping unit includes a pressing motor, a pressing roller group, and a roller group synchronous belt. The pressing motor is provided on one side of the pressing roller group, and the roller group synchronous belt is sleeved on one side of the pressing roller group. The pressing roller group applies pressure in a gradient along the running direction of the filter belt. The pressing roller group (52) adopts a large-diameter pressing roller.

[0014] Preferably, the feeding and distributing unit includes a distributing mounting frame, a leveling hopper, an adjusting weir plate cylinder, a weir plate, and a distributed distributor. Two distributing mounting frames are located on both sides of the frame, and a leveling hopper is located between the upper ends of the two distributing mounting frames. A weir plate is located at the discharge end of the leveling hopper, and an adjusting weir plate cylinder is located on one side of the weir plate. The distributed distributor is connected to the discharge end of the leveling hopper by bolts.

[0015] Preferably, the filter belt tension adjustment unit includes an adjustment mounting frame, a tension cylinder, an adjustment slide, a sliding mounting frame, a tension roller, and a tension sensor. The adjustment mounting frame is installed inside the frame. A tension cylinder is bolted to one side of the adjustment mounting frame. Adjustment slides are provided on both sides of the adjustment mounting frame. The two ends of the sliding mounting frame are T-shaped and cooperate with the adjustment slides. A tension roller is provided at the lower end of the sliding mounting frame. A tension sensor is sleeved on the outer periphery of the middle of the tension roller.

[0016] Preferably, the filter belt regeneration unit includes a water pump, water pipe, spray nozzle, cleaning motor, cleaning timing belt, cleaning roller brush, air pump, air pipe, air nozzle, and drainage trough. The water pump is located on one side of the frame, one end of the water pipe is connected to the water pump, and the other end is equipped with an array of spray nozzles. Two cleaning roller brushes are located on both sides of the water pipe. The cleaning motor is located on the side of the cleaning roller brush away from the water pump, and the cleaning timing belt is fitted on the side of the two cleaning roller brushes close to the cleaning motor. The air pump is located on the same side of the frame as the water pump, one end of the air pipe is connected to the air pump, and the other end of the air pipe is equipped with an array of air nozzles. The drainage trough is located below the frame.

[0017] Preferably, the belt vacuum flat plate filter unit includes a lifting cylinder assembly, a connecting frame, a vacuum box, a liquid collection manifold, a vacuum pump, a pressure valve, a gas-liquid separator, and a regulating valve. The lifting cylinder assembly is arranged between the frames, and the movable end of the lifting cylinder assembly is provided with a connecting frame. The vacuum box is fixedly connected between the connecting frames by bolts. The gas-liquid separator is arranged below the vacuum box and is connected to the vacuum box through the liquid collection manifold. A regulating valve is provided on the liquid collection manifold. A vacuum pump is provided at one end of the gas-liquid separator, and a pressure valve is provided at the end of the gas-liquid separator near the vacuum pump.

[0018] In summary, the present invention has the following main beneficial effects:

[0019] This equipment employs a combined vacuum filtration and gradient flexible pressing dewatering process. First, free water is rapidly removed through a belt-type vacuum plate filter unit. Then, capillary water is removed through a series of press rollers under progressively increasing pressure. This process improves dewatering efficiency by over 30% compared to conventional equipment, resulting in a lower and more uniform filter cake moisture content. A distributed feeder, combined with a weir plate for pressure stabilization, ensures uniform material distribution across the entire width, preventing uneven flow and accumulation, thus guaranteeing consistent dewatering from the source. The gradient flexible pressurization design maximizes the preservation of the intact morphology of the flake pearlescent pigments during deep dewatering, preventing damage to the crystal structure and ensuring the finished product meets gloss and quality standards. The equipment is equipped with a tensioned filter belt. Adjustable and closed-loop tension control, combined with automatic belt alignment, effectively solves the problems of belt misalignment and slackness in conventional belt conveyors, significantly improving continuous operation stability. The filter belt regeneration unit uses high-pressure water washing, mechanical brushing, and gas purging for triple cleaning, which thoroughly removes residual materials from the filter belt pores, preventing clogging, extending the filter belt's service life, and reducing consumable costs. The entire process is automated and continuous, eliminating the need for frequent manual unloading and cleaning. The electrical control box centrally controls the coordinated operation of each unit, making it simple to operate and with low labor costs, making it more suitable for large-scale industrial production. The overall operating cost and maintenance difficulty are significantly lower than conventional machinery on the market. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the feeding and feeding unit structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the belt vacuum flat plate filter unit structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the pressing and shaping unit structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the filter belt tension adjustment unit of the present invention;

[0025] Figure 6 This is a schematic diagram of the filter belt regeneration unit structure of the present invention.

[0026] Figure Descriptions: 1. Frame; 11. Driven Roller; 12. Drive Motor; 13. Drive Roller; 2. Filter Belt; 3. Feeding and Distributing Unit; 31. Distributing Mounting Frame; 32. Equalizing Hopper; 33. Adjusting Weir Plate Cylinder; 34. Weir Plate; 35. Distributed Distributor; 4. Belt Vacuum Flat Plate Filter Unit; 41. Lifting Cylinder Assembly; 42. Connecting Frame; 43. Vacuum Box; 44. Liquid Collection Main Pipe; 45. Vacuum Pump; 46. Pressure Valve; 47. Gas-Liquid Separator; 48. Regulating Valve; 5. Pressing and Shaping Unit; 51. Press motor; 52. Press roller assembly; 53. Roller assembly synchronous belt; 6. Filter belt tension adjustment unit; 61. Adjustment mounting bracket; 62. Tensioning cylinder; 63. Adjustment chute; 64. Sliding mounting bracket; 65. Tensioning roller; 66. Tension sensor; 7. Filter belt regeneration unit; 71. Water pump; 72. Water pipe; 73. Water spray nozzle; 74. Cleaning motor; 75. Cleaning synchronous belt; 76. Cleaning roller brush; 77. Air pump; 78. Air pipe; 79. Air nozzle; 710. Drainage trough; 8. Electrical control box. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The embodiments of the present invention will now be described.

[0029] Please refer to the appendix carefully. Figure 1-6 An efficient dehydration method for flake pearlescent pigments includes the following steps:

[0030] Step 1: The pearlescent pigment slurry is fed into the uniform hopper 32. After being stabilized by the weir plate 34, it is evenly spread on the upper surface of the filter belt 2 along the width direction by the distributed distributor 35 to form a material layer of uniform thickness. The filter belt 2 is circulated under the drive of the active roller 13.

[0031] Step 2: The filter belt 2 with slurry spread into the belt vacuum plate filter unit 4, where free water is quickly removed under the stable negative pressure formed by the vacuum box 43, thus completing the vacuum filtration and dewatering.

[0032] Step 3: The initially dehydrated filter cake enters the pressing and shaping unit 5 along with the filter belt 2. It is subjected to gradient flexible pressure by the pressing roller group 52 to gradually remove the capillary water inside the filter cake while maintaining the integrity of the flaky pigment morphology.

[0033] Step 4: The dehydrated filter cake is automatically unloaded at the discharge end of the pressing and shaping unit 5 as the filter belt 2 bends and peels off. After unloading, the filter belt 2 first enters the filter belt tension adjustment unit 6 for tension correction and deviation correction, and then enters the filter belt regeneration unit 7.

[0034] Step 5: Filter belt 2 enters filter belt regeneration unit 7 and undergoes high-pressure water washing, mechanical brushing and gas purging for combined regeneration to remove residual materials in the pores, and then returns to the feed end for cyclic operation.

[0035] For details, please refer to the appendix. Figure 1 A belt vacuum plate filter press system for flake pearlescent pigments includes a frame 1, a filter belt 2, a feeding and spreading unit 3, a belt vacuum plate filter unit 4, a pressing and shaping unit 5, a filter belt tension adjustment unit 6, a filter belt regeneration unit 7, and an electrical control box 8. The feeding and spreading unit 3 is located above the frame 1 to ensure uniform distribution of the slurry and prevent uneven flow and accumulation. The belt vacuum plate filter unit 4 is located behind the feeding and spreading unit 3 and inside the frame 1 to perform negative pressure solid-liquid separation of the slurry. The pressing and shaping unit 5 is located behind the belt vacuum plate filter unit 4 to further dehydrate the filter cake and protect the flake particles. The filter belt tension adjustment unit 6 is located below the pressing and shaping unit 5 to maintain appropriate tension in the filter belt 2 to prevent loosening or deviation. The filter belt regeneration unit 7 is located on the side of the pressing and shaping unit 5 near the feeding end to clean the filter belt 2 and restore its filtration performance. The electrical control box 8 is located on one side of the frame 1 for centralized control of the operating parameters and coordinated operation of each unit.

[0036] For details, please refer to the appendix. Figure 4The pressing and shaping unit 5 includes a pressing motor 51, a pressing roller assembly 52, and a roller assembly timing belt 53. The pressing motor 51 is located on one side of the pressing roller assembly 52 to provide power for the roller assembly's operation. The roller assembly timing belt 53 is fitted on one side of the pressing roller assembly 52 to ensure synchronous rotation of multiple rollers and prevent slippage and shearing. The pressing roller assembly 52 consists of 3-5 sets of pressing rollers. Along the filter belt's running direction, the gap between each pressing roller and the filter belt decreases sequentially, and the pressure increases step by step to achieve deep dewatering. The surface of the pressing rollers in the pressing roller assembly 52 is covered with a flexible and wear-resistant material to achieve flexible contact with the filter cake. The pressing roller assembly 52 uses large-diameter pressing rollers, which allows the filter belt 2 to operate on it with... A large bending radius is used to prevent the filter cake from peeling off prematurely due to excessive bending in the pressing section. The pressing roller group 52 includes a first pressing roller, a second pressing roller, and a third pressing roller arranged sequentially along the running direction of the filter belt. The gap between the first pressing roller and the filter belt is 5 mm, and the applied pressure is 0.1-0.2 MPa; the gap between the second pressing roller and the filter belt is 3 mm, and the pressure is 0.3-0.4 MPa; the gap between the third pressing roller and the filter belt is 1 mm, and the pressure is 0.5-0.6 MPa. The surface of each pressing roller is covered with a polyurethane elastic layer with a thickness of 10-15 mm to achieve flexible contact with the filter cake and prevent the flaky pearlescent pigment particles from breaking.

[0037] For details, please refer to the appendix. Figure 2 The feeding and distributing unit 3 includes a distributing mounting frame 31, a uniform hopper 32, an adjusting weir plate cylinder 33, a weir plate 34, and a distributed distributor 35. Two distributing mounting frames 31 are set on both sides of the frame 1 to provide stable support and height positioning. A uniform hopper 32 is set between the upper ends of the two distributing mounting frames 31 for buffering and stabilizing the slurry flow. A weir plate 34 is set at the discharge end of the uniform hopper 32 to control the discharge flow rate and the thickness of the material layer. An adjusting weir plate cylinder 33 is set on one side of the weir plate 34 to automatically adjust the opening of the weir plate 34 to adapt to slurries of different concentrations. The discharge end of the uniform hopper 32 is connected to the distributed distributor 35 by bolts to distribute the slurry evenly along the full width of the filter belt 2.

[0038] For details, please refer to the appendix. Figure 5The filter belt tensioning adjustment unit 6 includes an adjustment mounting frame 61, a tensioning cylinder 62, an adjustment slide 63, a sliding mounting frame 64, a tensioning roller 65, and a tension sensor 66. The adjustment mounting frame 61 is installed inside the frame 1 as the mounting base for the tensioning mechanism. A tensioning cylinder 62 is bolted to one side of the adjustment mounting frame 61 to provide tension thrust and automatically compensate for the elongation of the filter belt 2. Adjustment slides 63 are provided on both sides of the adjustment mounting frame 61 to guide the sliding mounting frame 64. The two ends of the sliding mounting frame 64 are T-shaped and cooperate with the adjustment slides 63 to ensure smooth and unobstructed movement. A tensioning roller 65 is provided at the lower end of the sliding mounting frame 64 to press and tension the filter belt 2. A tension sensor 66 is sleeved on the outer periphery of the tensioning roller 65 to detect the tension of the filter belt 2 in real time and feed it back to the electrical control box 8 to achieve closed-loop control.

[0039] For details, please refer to the appendix. Figure 6 The filter belt regeneration unit 7 includes a water pump 71, a water pipe 72, a spray nozzle 73, a cleaning motor 74, a cleaning synchronous belt 75, cleaning roller brushes 76, an air pump 77, an air pipe 78, an air nozzle 79, and a drainage trough 710. A water pump 71 is located on one side of the frame 1 to provide water for high-pressure cleaning. One end of the water pipe 72 is connected to the water pump 71, and the other end is equipped with an array of spray nozzles 73 for high-pressure rinsing of the filter belt 2 surface and residual materials within the pores. Two cleaning roller brushes 76 are located on both sides of the water pipe 72 for mechanical brushing to enhance the cleaning effect. A cleaning motor 74 is installed on the side of the roller brush 76 away from the water pump 71 to provide power for the rotation of the roller brush. A cleaning synchronization belt 75 is fitted on the side of the two cleaning roller brushes 76 near the cleaning motor 74 to ensure that the roller brushes on both sides operate synchronously. An air pump 77 is installed on the same side of the frame 1 as the water pump 71 to provide high-pressure purging gas. One end of the air pipe 78 is connected to the air pump 77, and the other end is equipped with an array of air nozzles 79 to blow away moisture and residual materials from the surface of the filter belt 2. A drainage trough 710 is installed below the frame 1 to collect and discharge the cleaning wastewater.

[0040] For details, please refer to the appendix. Figure 3The belt-type vacuum flat plate filter unit 4 includes a lifting cylinder assembly 41, a connecting frame 42, a vacuum box 43, a liquid collection manifold 44, a vacuum pump 45, a pressure valve 46, a gas-liquid separator 47, and a regulating valve 48. The lifting cylinder assembly 41 is located between the frames 1 and is used to drive the vacuum box 43 to rise and fall to ensure a tight seal with the filter belt 2. The movable end of the lifting cylinder assembly 41 is provided with a connecting frame 42 for fixing and supporting the vacuum box 43. The vacuum box 43 is fixedly connected to the connecting frames 42 by bolts to form a negative pressure zone for rapid cooling. The rapid filtration system includes a gas-liquid separator 47 located below the vacuum box 43, used to separate the gas-liquid mixture generated during filtration. The gas-liquid separator 47 is connected to the vacuum box 43 via a liquid collection manifold 44 for collecting and transporting the filtrate. A regulating valve 48 is installed on the liquid collection manifold 44 to regulate the filtrate flow rate and vacuum level. A vacuum pump 45 is installed at one end of the gas-liquid separator 47 to provide a stable negative pressure for the system. A pressure valve 46 is installed at the end of the gas-liquid separator 47 near the vacuum pump 45 to protect the vacuum system and stabilize the negative pressure value.

[0041] For details, please refer to the appendix. Figure 4 The frame 1 is equipped with a driven roller 11, a driving roller 13 and a driving motor 12. The driving motor 12 drives the driving roller 13 to provide power to the filter belt 2. The driven roller 11 works with the driving roller 13 to guide and support the filter belt 2. The filter belt tension adjustment unit 6 works with the driven roller 13 to achieve stable operation, automatic correction and centering of the filter belt 2, and ensure reliable continuous dewatering operation.

[0042] The working principle of this invention is as follows:

[0043] During operation, the slurry is evenly spread onto the belt vacuum flat plate filter unit 4 by the distributed distributor 35. Under the negative pressure of the vacuum box 43, the free water in the slurry is quickly discharged through the filter belt 2, initially forming a filter cake. The capillary water that has not been removed moves with the filter belt 2 into the gradient pressing zone of the subsequent pressing and shaping unit 5. This zone consists of multiple sets of press rollers 52 with increasing pressure. The filter belt 2 forms a pressing gap from shallow to deep between the rollers. The gradually increasing pressure performs flexible pressing on the filter cake, which not only efficiently removes capillary water and achieves deep dehydration, but also avoids the damage to the flaky pigment particles caused by rigid extrusion through flexible contact, maintaining their intact crystal surface and gloss. During the dehydration process, the filter belt 2 runs synchronously under the drive of the drive roller 13, realizing continuous automated operation. The filter belt regeneration unit 7 performs a comprehensive cleaning and purging regeneration of the filter belt 2 to prepare for the next cycle. With the tension correction of the filter belt tension adjustment unit 6, the long-term stable operation of the system is ensured.

[0044] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A highly efficient dehydration method for flake pearlescent pigments, characterized in that, Includes the following steps: Step 1: The pearlescent pigment slurry is fed into the uniform hopper (32), and after being stabilized by the weir plate (34), it is evenly spread on the upper surface of the filter belt (2) by the distributed distributor (35). The filter belt (2) is circulated under the drive of the active roller (13). Step 2: The filter belt (2) with slurry is spread into the belt vacuum plate filter unit (4), and vacuum filtration and dewatering are completed under the negative pressure of the vacuum box (43); Step 3: The initially dehydrated filter cake enters the pressing and shaping unit (5) along with the filter belt (2), and the capillary water is removed by the gradient flexible pressure of the pressing roller group (52); Step 4: The dehydrated filter cake is bent and peeled off at the discharge end of the pressing and shaping unit (5) and unloaded. The unloaded filter belt (2) enters the filter belt tension adjustment unit (6) for tension correction and then enters the filter belt regeneration unit (7). Step 5: The filter belt (2) enters the filter belt regeneration unit (7) for cleaning and purging regeneration, and then returns to the feed end for cyclic operation.

2. The belt vacuum plate filter press system for flake pearlescent pigments according to claim 1, characterized in that, The device includes a frame (1), a filter belt (2), a feeding and feeding unit (3), a belt vacuum plate filter unit (4), a pressing and shaping unit (5), a filter belt tension adjustment unit (6), a filter belt regeneration unit (7), and an electrical control box (8). The feeding and feeding unit (3) is located above the frame (1), the belt vacuum plate filter unit (4) is located behind the feeding and feeding unit (3) and is located inside the frame (1), the pressing and shaping unit (5) is located behind the belt vacuum plate filter unit (4), the filter belt tension adjustment unit (6) is located below the pressing and shaping unit (5), the filter belt regeneration unit (7) is located below the discharge end of the pressing and shaping unit (5) and is located on the return path of the filter belt (2), and the electrical control box (8) is located on one side of the frame (1).

3. A belt vacuum plate filter press system for flake pearlescent pigments according to claim 2, characterized in that, The pressing and shaping unit (5) includes a pressing motor (51), a pressing roller group (52), and a roller group synchronous belt (53). The pressing motor (51) is located on one side of the pressing roller group (52), and the roller group synchronous belt (53) is sleeved on one side of the pressing roller group (52). The pressing roller group (52) consists of 3-5 pressing rollers. Along the running direction of the filter belt, the gap between each pressing roller and the filter belt decreases sequentially. The pressing roller group (52) uses large-diameter pressing rollers.

4. A belt vacuum plate filter press system for flake pearlescent pigments according to claim 2, characterized in that, The feeding and feeding unit (3) includes a feeding mounting frame (31), a uniform hopper (32), an adjusting weir plate cylinder (33), a weir plate (34), and a distributed feeder (35). Two feeding mounting frames (31) are set on both sides of the frame (1). A uniform hopper (32) is set between the upper ends of the two feeding mounting frames (31). A weir plate (34) is set at the discharge end of the uniform hopper (32). An adjusting weir plate cylinder (33) is set on one side of the weir plate (34). A distributed feeder (35) is bolted to the discharge end of the uniform hopper (32).

5. A belt vacuum plate filter press system for flake pearlescent pigments according to claim 2, characterized in that, The filter belt tension adjustment unit (6) includes an adjustment mounting frame (61), a tension cylinder (62), an adjustment slide groove (63), a sliding mounting frame (64), a tension roller (65), and a tension sensor (66). The adjustment mounting frame (61) is installed inside the frame (1). A tension cylinder (62) is installed on one side of the adjustment mounting frame (61) by bolts. Adjustment slide grooves (63) are installed on both sides of the adjustment mounting frame (61). The two ends of the sliding mounting frame (64) are T-shaped and cooperate with the adjustment slide grooves (63). A tension roller (65) is installed at the lower end of the sliding mounting frame (64). A tension sensor (66) is sleeved on the outer periphery of the middle of the tension roller (65).

6. A belt vacuum plate filter press system for flake pearlescent pigments according to claim 2, characterized in that, The filter belt regeneration unit (7) includes a water pump (71), a water pipe (72), a spray nozzle (73), a cleaning motor (74), a cleaning synchronous belt (75), a cleaning roller brush (76), an air pump (77), an air pipe (78), an air nozzle (79), and a drainage trough (710). The water pump (71) is installed on one side of the frame (1). One end of the water pipe (72) is connected to the water pump (71), and the other end is equipped with an array of spray nozzles (73). Two cleaning roller brushes (76) are installed. On both sides of the water pipe (72), a cleaning motor (74) is provided on the side of the cleaning roller brush (76) away from the water pump (71). A cleaning synchronous belt (75) is fitted on the side of the two cleaning roller brushes (76) close to the cleaning motor (74). An air pump (77) is set on the same side of the frame (1) as the water pump (71). One end of the air pipe (78) is connected to the air pump (77), and the other end of the air pipe (78) is arrayed with air nozzles (79). A drainage trough (710) is set below the frame (1).

7. A belt vacuum plate filter press system for flake pearlescent pigments according to claim 2, characterized in that, The belt vacuum flat plate filter unit (4) includes a lifting cylinder assembly (41), a connecting frame (42), a vacuum box (43), a liquid collection pipe (44), a vacuum pump (45), a pressure valve (46), a gas-liquid separator (47), and a regulating valve (48). The lifting cylinder assembly (41) is located between the frames (1). The movable end of the lifting cylinder assembly (41) is provided with a connecting frame (42). The connecting frames (42) are fixedly connected to the vacuum box (43) by bolts. The gas-liquid separator (47) is located below the vacuum box (43). The gas-liquid separator (47) is connected to the vacuum box (43) through the liquid collection pipe (44). The liquid collection pipe (44) is provided with a regulating valve (48). One end of the gas-liquid separator (47) is provided with a vacuum pump (45). The gas-liquid separator (47) is provided with a pressure valve (46) at the end near the vacuum pump (45).

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