A delayed-pressure filter belt dewatering device and method

Abstract

A delayed-pressure filter belt dewatering device and method are disclosed. The device includes a feeding system, a pre-compression forming system, a multi-layer delayed-pressure filter system, a discharge system, and a filter belt. The filter belt forms a closed-loop structure through the pre-compression forming system, the multi-layer delayed-pressure filter system, and the discharge system. The feeding system feeds material into the filter belt, the pre-compression forming system pre-compresses and dewaters the material, and the discharge system removes material from the filter belt. The multi-layer delayed-pressure filter system includes a fabric stacking device, a filter press device, a discharge device, and a conveying device. The conveying device has a fabric stacking area and a filter press area. The fabric stacking device folds the filter belt back and forth into multiple layers of water-containing material. The filter press device compresses the multiple layers of water-containing material to obtain multiple layers of dewatered material. The discharge device conveys the multiple layers of dewatered material in a belt shape. This method, using the above-mentioned equipment, can achieve continuous, highly automated, efficient, and environmentally friendly multi-layer deep dewatering, belonging to the field of dewatering machine technology.

Description

Technical Field

[0001] This invention relates to the field of dewatering technology, specifically to a delayed pressure filter belt dewatering device and method. Background Technology

[0002] In recent years, the increasing volume of sludge has caused significant harm to humans and the natural environment. Therefore, sludge disposal, especially its harmless and resource-oriented treatment, is crucial. The key to harmless and resource-oriented sludge treatment lies in the sludge dewatering and volume reduction process. Current sludge dewatering and volume reduction technologies mainly rely on mechanical dewatering and low-temperature drying. The drying process consumes a large amount of energy and is not environmentally friendly. Therefore, using mechanical dewatering to achieve sludge reduction, harmlessness, and resource utilization is essential. In the current field of mechanical dewatering, belt dewatering equipment is widely used. Traditional ordinary belt dewatering machines, due to their generally limited dewatering effect, are often used in pre-compression dewatering processes. However, with technological advancements, multi-layer belt dewatering equipment has emerged in recent years. This equipment wraps the sludge in multiple layers of filter belts, then uses a hydraulic cylinder and other pressure systems for dewatering, achieving sludge dewatering and volume reduction. The principle of this type of multi-layer dewatering is to increase sludge yield by using a multi-layered filter belt in traditional belt dewatering. However, the working process of multi-layer dewatering equipment introduces new drawbacks: 1. Due to variations in sludge properties and uneven feeding, uniform sludge distribution is difficult during the feeding process, leading to sludge leakage during high-pressure filtration; 2. This method involves intermittent feeding, filtration, and unloading after feeding, hindering further output growth. Since the key to multi-layer dewatering equipment lies in the uniformity of sludge distribution, the lack of pre-compression dewatering easily results in uneven feeding, leading to inconsistent sludge thickness during feeding. This, in turn, causes uneven filtration, side blockage, and other production problems during filtration, resulting in poor production efficiency and hindering large-scale adoption. Summary of the Invention

[0003] In view of the technical problems existing in the prior art, the purpose of this invention is to provide a time-depressed belt dewatering device and method for continuous and automated operation of belt multilayer pressure filtration.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a delayed pressure filter belt dewatering device, comprising a feeding system, a pre-compression forming system, a multi-layer delayed pressure filter system, a discharge system, and a filter belt. The filter belt passes through the pre-compression forming system, the multi-layer delayed pressure filter system, and the discharge system to form a closed-loop structure. The feeding system is used to feed the material into the filter belt, the pre-compression forming system is used to pre-compress and dewater the material, and the discharge system is used to unload the material from the filter belt.

[0005] The multi-layer delayed pressure filter system includes a fabric stacking device, a filter press device, a discharge device, and a conveying device. The conveying device is equipped with a fabric stacking area and a filter press area. The installation positions of the fabric stacking device and the filter press device correspond to the fabric stacking area and the filter press area, respectively. The fabric stacking device is used to fold the filter belt back and forth into multiple layers of water-containing material. The conveying device is used to transfer the multiple layers of water-containing material between the fabric stacking area, the filter press area, and the discharge device. The filter press device is used to squeeze the multiple layers of water-containing material to obtain multiple layers of dewatered material. The discharge device is used to send out the multiple layers of dewatered material in a belt shape.

[0006] As a preferred embodiment, the conveying device includes a first conveyor belt mechanism and a pressure bearing body. The stacking area and the filter pressing area are arranged one after the other on the first conveyor belt mechanism. The discharge device is connected to the rear end of the first conveyor belt mechanism. The pressure bearing body is located below the filter pressing area. The discharge device includes a second conveyor belt mechanism for receiving multi-layer dewatered materials.

[0007] As a preferred embodiment, a transition plate is installed between the rear end of the second conveyor belt mechanism and the rear end of the first conveyor belt mechanism.

[0008] As a preferred embodiment, the discharge device further includes a discharge frame that can rotate along a horizontal axis, a second conveyor belt mechanism is installed at the bottom of the discharge frame, the discharge frame is used to accommodate multiple layers of dewatered material, and the rotation angle of the discharge frame is not less than 30°.

[0009] As a preferred embodiment, the discharge device further includes a tilting frame, a rotating shaft, a tilting motor, and a roller shutter assembly. The discharge frame is fixedly connected to the rotating shaft, which is rotatably connected to the tilting frame via bearings. The tilting motor is mounted on the tilting frame, connected to the rotating shaft, and drives the rotating shaft to rotate. The axis of the rotating shaft is horizontal. The discharge frame has a feed inlet, through which multi-layer dewatered materials enter the discharge frame and are conveyed to the second conveyor belt mechanism. The roller shutter assembly includes a drum and a roller shutter motor, which is mounted on the discharge frame and connected to the drum. A flexible roller shutter face is wound on the drum, and a feed guide roller is connected to the end of the roller shutter face. A track is provided on the side of the feed inlet, and the roller shutter face is slidably connected to the track. The rotation of the roller shutter motor drives the drum to rotate, thereby driving the roller shutter face to move along the track.

[0010] As a preferred embodiment, the rotating shaft is connected to the outside of the discharge frame, and the discharge device also includes a limiting component, which includes a limiting hydraulic cylinder. The output end of the limiting hydraulic cylinder is hinged to a limiting plate, and the limiting plate is connected to the outer side of the discharge frame.

[0011] As a preferred embodiment, the feeding system includes a material bin, a geared motor, an active material roller, a driven material roller, and a transmission gear set. The geared motor is connected to the active material roller and drives it to rotate. The active material roller is connected to the driven material roller via the transmission gear set. A material feeding channel is formed between the active and driven material rollers. The material feeding channel is directly opposite the entrance of the material bin, and the material falls from the material feeding channel onto the pre-compression forming system.

[0012] As a preferred embodiment, the pre-compression forming system includes a pre-compression frame, an upper pre-compression assembly, and a lower pre-compression assembly. Both the upper and lower pre-compression assemblies include a tension roller, a pre-compression roller, a power roller, and a first pad. The tension roller, pre-compression roller, and power roller are rotatably mounted on the pre-compression frame. The first pad is a strip structure with its ends connected and wraps around the outside of the tension roller, pre-compression roller, and power roller.

[0013] Both the upper and lower pre-compression components have multiple pre-compression rollers arranged alternately. The filter belt carrying the material passes around the multiple pre-compression rollers in an S-shape and exits between the power rollers of the upper and lower pre-compression components.

[0014] As a preferred embodiment, the delayed pressure filter belt dewatering equipment also includes an upper idler roller assembly and a lower idler roller assembly. Both the upper and lower idler roller assemblies include a second pad and multiple idler rollers. The second pad has a strip structure with its ends connected and wraps around the outside of the multiple idler rollers. The filter belt includes an upper filter belt and a lower filter belt. The outlet of the feeding system faces the lower filter belt. The feeding system feeds the material onto the lower filter belt. The upper and lower filter belts sandwich the material in the middle and pass through a pre-compression forming system, a multi-layer delayed pressure filtration system, and a discharge system. After passing through the discharge system, the upper and lower filter belts separate. The upper filter belt returns to the pre-compression forming system after bypassing the upper idler roller assembly, and the lower filter belt returns to the pre-compression forming system after bypassing the lower idler roller assembly.

[0015] As a preferred option, the delayed pressure filter belt dewatering equipment also includes two cleaning devices, which are used to clean the upper filter belt and the lower filter belt respectively.

[0016] As a preferred embodiment, the delayed pressure filter belt dewatering equipment also includes two idler roller assemblies. Each idler roller assembly includes a second pad and multiple idler rollers. The second pad has a strip structure with its ends connected and wraps around the outside of the multiple lower idler rollers. The upper filter belt and the lower filter belt are respectively in close contact with the outside of the second pad of the two idler roller assemblies.

[0017] As a preferred embodiment, the fabric stacking device includes a fabric stacking frame, a limiting roller, a constraint roller, a fabric stacking roller, a horizontal movement assembly, and a height adjustment assembly;

[0018] The filter belt containing the material passes through the limiting roller, the constraint roller, and the stacking roller in sequence. The limiting roller is installed on the stacking frame, and the constraint roller is located below the limiting roller. The stacking roller is installed on the stacking frame through a horizontal moving component and a height adjusting component. The horizontal moving component drives the stacking roller to move back and forth horizontally, and the height adjusting component drives the stacking roller to move up and down. The constraint roller is connected to the height adjusting component and moves up and down synchronously with the stacking roller.

[0019] As a preferred option, both the height adjustment component and the horizontal movement component employ a lead screw drive mechanism.

[0020] As a preferred embodiment, the filter press device includes a filter press frame, a first high-pressure plate, a filter press hydraulic cylinder, and a second high-pressure plate. The first high-pressure plate is mounted on the filter press frame, the filter press hydraulic cylinder is mounted at the bottom end of the first high-pressure plate, the output end of the filter press hydraulic cylinder faces downward and is connected to the second high-pressure plate, and the filter pressing area is located below the second high-pressure plate.

[0021] The filter press frame is equipped with multiple positioning slots arranged vertically. The first high pressure plate and the second high pressure plate are respectively connected to a fixed positioning device that can be installed on any positioning slot. The fixed positioning device is detachably connected to the positioning slot.

[0022] As a preferred embodiment, the unloading system includes two unloading guide rollers and two scraper rollers. The filter belt passes between the two unloading guide rollers, and the upper and lower filter belts pass around the two scraper rollers respectively. The scraper rollers are equipped with scraper blades on their outer sides, which scrape off the material on the filter belt by adhering closely to the filter belt.

[0023] A delayed-pressure filter belt dewatering method employs the aforementioned delayed-pressure filter belt dewatering equipment. The feeding system evenly distributes the water-containing material within the filter belt. The filter belt, encasing the material, enters a pre-compression forming system. The pre-compressed material then enters a stacking device along with the filter belt. The stacking device folds the filter belt into multiple layers of water-containing material. These multiple layers of water-containing material are conveyed to the filter press zone, where the filter press device squeezes and dewaters the multiple layers of water-containing material, resulting in multiple layers of dewatered material. The dewatered material is then conveyed to a discharge device. After the discharge device flips, the multiple layers of water-containing material are discharged layer by layer from the bottom to the unloading system for unloading. The unloaded filter belt encapsulates the water-containing material conveyed by the feeding system and returns to the pre-compression forming system, forming a cycle.

[0024] While the multi-layered water-containing material is squeezed and dewatered in the filter press zone, the multi-layered dewatered material from the previous cycle is sent from the discharge device to the unloading system for discharge, and the filter belt of the next cycle is folded in the stacking zone.

[0025] In summary, the present invention has the following advantages:

[0026] (1) This invention integrates pre-compression dewatering, multi-layer fabrication, and unloading into a closed-loop process, which can achieve continuous and automated deep dewatering.

[0027] (2) The filter belt of the present invention is first fed by an adjustable feeding system and then pre-pressed by a pre-pressing molding system, so that the material enclosed in the filter belt is of uniform thickness, which can ensure uniform subsequent filtration, good dewatering effect, and less likely to cause mud leakage.

[0028] (3) The present invention uses a discharge device to first flip the material and then discharge it from the bottom, eliminating the need to discharge from the top. This solves the problem of difficult discharge in multi-layer filter presses and is conducive to achieving continuous multi-layer dehydration.

[0029] (4) The fabric stacking device of the present invention uses a limiting roller and a constraint roller before the fabric stacking roller to constrain the filter belt, so that it remains vertical between the fabric stacks, making the fabric stacking more neat and uniform, and the subsequent pressing and filtration effect better.

[0030] (5) The present invention uses a high-tensile water filter material pad on the inner side of the filter belt, which can fully stretch the filter belt and have a large friction between the filter belt and the material, making it less likely for the filter belt to slip during movement. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a delayed-pressure filter belt dewatering device.

[0032] Figure 2 This is a front view of a delayed-pressure filter belt dewatering device.

[0033] Figure 3 This is a three-dimensional structural diagram of a delayed-pressure filter belt dewatering device during its operation.

[0034] Figure 4 This is a front view of a time-delayed pressure filter belt dewatering device during operation.

[0035] Figure 5 This is a top view of the feeding system.

[0036] Figure 6 This is a schematic diagram of the pre-compression forming system.

[0037] Figure 7 This is a partial structural diagram of the fabric stacking device.

[0038] Figure 8 This is a partial structural diagram of a filter press device.

[0039] Figure 9 This is a schematic diagram of the discharge device.

[0040] Among them, 1 is the feeding system, 2 is the pre-compression forming system, 3 is the fabric stacking device, 4 is the filter press device, 5 is the discharge device, 6 is the conveying device, 7 is the unloading system, 8 is the filter belt, 9 is the idler roller, 10 is the cleaning device, and 11 is the second pad material.

[0041] 101 is a geared motor, 102 is the active fabric roller, 103 is the driven fabric roller, 104 is the fabric bin, 105 is the transmission gear set, 106 is the bearing housing, and 107 is the sealing ring.

[0042] 201 is the tensioning roller, 202 is the pre-compression roller, 203 is the power roller, 204 is the first pad material, and 205 is the tensioning hydraulic cylinder.

[0043] 301 is the constraint roller, 302 is the base plate, 303 is the synchronous transmission assembly, 304 is the fabric folding frame, 305 is the horizontal lead screw, 306 is the fabric folding roller, 307 is the height adjustment motor, 308 is the folding displacement motor, and 309 is the limit roller.

[0044] 401 is the first high-pressure plate, 402 is the fixing and positioning device, 403 is the filter press hydraulic cylinder, 404 is the filter press frame, and 405 is the second high-pressure plate.

[0045] 501 is the discharge frame, 502 is the second conveyor belt mechanism, 503 is the rotating shaft, 504 is the limit hydraulic cylinder, 505 is the drum, and 506 is the discharge guide roller. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] like Figures 1-4 As shown, a delayed-pressure filter belt dewatering device includes a feeding system, a pre-compression forming system, a multi-layer delayed-pressure filter system, a discharge system, and a filter belt. The filter belt passes through the pre-compression forming system, the multi-layer delayed-pressure filter system, and the discharge system to form a closed-loop structure. The feeding system is used to feed the material into the filter belt, the pre-compression forming system is used to pre-compress and dewater the material, and the discharge system is used to unload the material from the filter belt.

[0049] The multi-layer delayed pressure filter system includes a fabric stacking device, a filter press device, a discharge device, and a conveying device. The conveying device is equipped with a fabric stacking area and a filter press area. The installation positions of the fabric stacking device and the filter press device correspond to the fabric stacking area and the filter press area, respectively. The fabric stacking device is used to fold the filter belt back and forth into multiple layers of water-containing material. The conveying device is used to transfer the multiple layers of water-containing material between the fabric stacking area, the filter press area, and the discharge device. The filter press device is used to squeeze the multiple layers of water-containing material to obtain multiple layers of dewatered material. The discharge device is used to send out the multiple layers of dewatered material in a belt shape.

[0050] The conveying device includes a first conveyor belt mechanism and a pressure bearing body. The stacking area and the filter pressing area are arranged one after the other on the first conveyor belt mechanism. The discharge device is connected to the rear end of the first conveyor belt mechanism. The pressure bearing body is located below the filter pressing area. The discharge device includes a second conveyor belt mechanism for receiving multi-layer dewatered materials.

[0051] The first and second conveyor belt mechanisms can use existing conveyor belt conveyors.

[0052] The pressure-bearing body is located inside the conveying device. It contacts the surface of the conveying device, so that the pressure generated during the filter pressing process is borne by the pressure-bearing body.

[0053] A transition plate is installed between the rear end of the second conveyor belt mechanism and the rear end of the first conveyor belt mechanism.

[0054] like Figure 9 As shown, the discharge device also includes a discharge frame that can rotate along a horizontal axis. A second conveyor belt mechanism is installed at the bottom of the discharge frame. The discharge frame is used to accommodate multiple layers of dewatered material, and the rotation angle of the discharge frame is not less than 30°. More specifically, the rotation angle of the discharge frame is not less than 90°.

[0055] The discharge device also includes a tilting frame, a rotating shaft, a tilting motor, and a roller shutter assembly. The discharge frame is fixedly connected to the rotating shaft, which is rotatably connected to the tilting frame via bearings. The tilting motor is mounted on the tilting frame, connected to the rotating shaft, and drives the rotating shaft to rotate. The axis of the rotating shaft is horizontal. The discharge frame has a feed inlet, through which multi-layer dewatered materials enter the discharge frame and are conveyed to the second conveyor belt mechanism. The roller shutter assembly includes a roller and a roller shutter motor, which is mounted on the discharge frame and connected to the roller. A flexible roller shutter face is wound on the roller, and the end of the roller shutter face is connected to a feed guide roller. A track is provided on the side of the feed inlet, and the roller shutter face is slidably connected to the track. The rotation of the roller shutter motor drives the roller to rotate, thereby driving the roller shutter face to move along the track.

[0056] The roller is rotatably installed at the bottom of the discharge frame. The bottom end of the track is lower than the position where the second conveyor belt mechanism contacts the multi-layer dewatered material. The end of the roller shutter door enters the track from the bottom end of the track and can slide along the track.

[0057] The roller shutter door first descends along the track to the bottom, opening the feed inlet and opening the door. After the multi-layer dewatered material enters the discharge frame from the feed inlet, the roller shutter door motor rotates, driving the end of the roller shutter door to rise. At this time, the roller shutter door rises along the feed inlet, closing the door. The filter belt connecting the multi-layer dewatered material and the multi-layer moisture-containing material is also lifted by the feed guide roller, playing a guiding role.

[0058] The tilting motor drives the discharge frame to rotate around the pivot shaft, causing the bottom of the discharge frame to tilt upwards. A discharge port is located near the bottom of the discharge frame, and a discharge guide roller is installed at the discharge port. The filter belt passes through the discharge frame along the discharge guide roller. When the discharge frame is vertical, the filter belt at the bottom experiences the greatest pressure, requiring the greatest tension for discharge. As the rotation angle of the discharge frame increases, the required tension gradually decreases. If the rotation angle of the discharge frame reaches 90° or more, the discharge tension can be minimized. The rotation angle of the discharge frame can also be designed to 185°, in which case the entire discharge frame tilts, with the bottom of the discharge frame rotating to the top.

[0059] The rotating shaft is connected to the outside of the discharge frame. The discharge device also includes a limiting component, which includes a limiting hydraulic cylinder. The output end of the limiting hydraulic cylinder is hinged to a limiting plate, and the limiting plate is connected to the outer side of the discharge frame.

[0060] In the empty frame state, the discharge frame is suspended by the rotating shaft and balanced in conjunction with the limiting plate. During the process of receiving multiple layers of water-containing materials, the force on the discharge frame is supported by the limiting hydraulic cylinder to keep the discharge frame in a stable state.

[0061] like Figure 5 As shown, the feeding system includes a material bin, a geared motor, an active material roller, a driven material roller, and a transmission gear set. The geared motor is connected to the active material roller and drives it to rotate. The active material roller is connected to the driven material roller via the transmission gear set. A material feeding channel is formed between the active and driven material rollers. The material feeding channel is directly opposite the entrance of the material bin, and the material falls from the material feeding channel onto the pre-compression forming system.

[0062] The active and driven feeding rollers are connected to the feeding bin via bearing housings. Sealing rings are also installed between the active and driven feeding rollers and between the active and driven feeding rollers and the feeding bin. The synchronous reverse rotation of the active and driven feeding rollers achieves material mixing and feeding. The system can adjust the operating speed of the geared motor according to the state and speed of the incoming material, realizing the feeding function of different materials and different running speeds.

[0063] like Figure 6 As shown, the pre-compression forming system includes a pre-compression frame, an upper pre-compression assembly, and a lower pre-compression assembly. Both the upper and lower pre-compression assemblies include a tension roller, a pre-compression roller, a power roller, and a first pad. The tension roller, pre-compression roller, and power roller are rotatably mounted on the pre-compression frame. The first pad is a strip structure with its ends connected and wraps around the outside of the tension roller, pre-compression roller, and power roller.

[0064] Both the upper and lower pre-compression components have multiple pre-compression rollers arranged alternately. The filter belt carrying the material passes around the multiple pre-compression rollers in an S-shape and exits between the power rollers of the upper and lower pre-compression components.

[0065] The upper and lower preload components also include a tensioning hydraulic cylinder, the output end of which is connected to the tensioning roller.

[0066] The first padding material uses high-tensile filtration materials, such as blankets or stainless steel filter screens. Under the action of the tensioning hydraulic cylinder, the tensile filtration material (such as blankets) forms a closed loop around the tensioning roller, pre-compression roller, and power roller. High pressure is generated in the area where it wraps around the pre-compression roller. When the filter belt wrapped with water-containing material enters the pre-compression forming system, it is subjected to high pressure in the area where it wraps around the pre-compression roller to achieve the purpose of dehydration. During this process, the material is subjected to the tensioning force of the tensioning hydraulic cylinder, so that the water-containing material wrapped by the filter belt achieves a uniform thickness.

[0067] The delayed pressure filter belt dewatering equipment also includes an upper idler roller assembly and a lower idler roller assembly. Both the upper and lower idler roller assemblies include a second pad and multiple idler rollers. The second pad has a strip structure with the ends connected and wraps around the outside of the multiple idler rollers. The filter belt includes an upper filter belt and a lower filter belt. The outlet of the feeding system faces the lower filter belt. The feeding system feeds the material onto the lower filter belt. The upper and lower filter belts sandwich the material in the middle and pass through a pre-compression forming system, a multi-layer delayed pressure filtration system, and a discharge system. After passing through the discharge system, the upper and lower filter belts separate. The upper filter belt returns to the pre-compression forming system after bypassing the upper idler roller assembly, and the lower filter belt returns to the pre-compression forming system after bypassing the lower idler roller assembly.

[0068] The second bedding material uses high-tensile filtration materials, such as blankets or stainless steel filter screens.

[0069] The delayed pressure filter belt dewatering equipment also includes two cleaning devices, which are used to clean the upper filter belt and the lower filter belt respectively.

[0070] like Figure 7 As shown, the fabric stacking device includes a fabric stacking frame, a limiting roller, a constraint roller, a fabric stacking roller, a horizontal moving assembly, and a height adjusting assembly;

[0071] The filter belt containing the material passes through the limiting roller, the constraint roller, and the stacking roller in sequence. The limiting roller is installed on the stacking frame, and the constraint roller is located below the limiting roller. The stacking roller is installed on the stacking frame through a horizontal moving component and a height adjusting component. The horizontal moving component drives the stacking roller to move back and forth horizontally, and the height adjusting component drives the stacking roller to move up and down. The constraint roller is connected to the height adjusting component and moves up and down synchronously with the stacking roller.

[0072] Both the height adjustment component and the horizontal movement component employ a lead screw drive mechanism.

[0073] The height adjustment assembly includes a height adjustment motor, a vertical lead screw, a mounting block, and a base plate. The mounting block is slidably connected to the frame and slides vertically. The mounting block is threadedly connected to the vertical lead screw, which is rotatably connected to the frame. The height adjustment motor is connected to the vertical lead screw and drives the vertical lead screw to rotate. The rotation of the vertical lead screw causes the mounting block to slide vertically.

[0074] The base plate is fixedly connected to the mounting block, the constraint roller is installed on the base plate, and the base plate is slidably connected to the fabric stacking frame.

[0075] The horizontal movement assembly includes a folding displacement motor, a horizontal lead screw, a slider, and a horizontal guide rod. The horizontal guide rod is fixedly connected to the mounting block, the slider is slidably connected to the horizontal guide rod, the slider is threaded onto the horizontal lead screw, the horizontal lead screw is rotatably connected to the mounting block, the folding displacement motor is connected to the horizontal lead screw and drives the horizontal lead screw to rotate, and when the horizontal lead screw rotates, it drives the slider to move back and forth horizontally. The fabric roller is mounted on the slider.

[0076] There are two vertical lead screws and two mounting blocks. The two mounting blocks are symmetrically arranged and threadedly connected to the two vertical lead screws respectively. The height adjustment motor is connected to one vertical lead screw through a transmission gear, and the vertical lead screw is connected to the other vertical lead screw through a synchronous transmission assembly.

[0077] After pre-compression forming, the water-containing material with uniform thickness is kept vertical by the action of limiting rollers and constraint rollers. The stacking roller slides back and forth on the horizontal screw to achieve uniform material distribution. The filter belt is evenly laid on the previous layer of material by the stacking roller. This process is repeated until the preset multi-layer stacking height is reached. After the stacking is completed, the multi-layer water-containing material is conveyed to the bottom of the filter press hydraulic cylinder by the conveying device. At this time, the stacking roller continues to perform a second stacking on the horizontal screw. The multi-layer water-containing material of the previous stack is pressurized and dewatered by the filter press hydraulic cylinder. The stacking time is the same as the filter pressing time. After the second stacking is completed, the filter-pressed water-containing material enters the discharge frame of the discharge device for continuous discharge by the transmission device. Then, it is unloaded by the unloading system. At this time, the multi-layer water-containing material of the second stacking is conveyed to the filter press area for dewatering.

[0078] The constraint roller, stacking roller, and base plate maintain a relative height according to the number of layers of fabric through a height adjustment component. After adjusting to the preset height, the stacking roller reciprocates left and right along the horizontal screw to spread the fabric. Once the fabric reaches the preset height, it is conveyed by a conveyor to the filter press for filtration. At this time, the stacking roller continues to stack the fabric, and the stacking time is consistent with the multi-layer filtration time. Depending on the different materials requiring different filtration times, the movement speed of the stacking roller is adjusted to match the filtration time with the multi-layer fabric spreading time, achieving delayed filtration. After the multi-layer moisture-containing material in the filter press zone has completed filtration, it is conveyed to the discharge frame by the conveyor. Simultaneously, the moisture-containing material in the stacking zone reaches the preset height and is conveyed to the filter press zone for filtration. The entire process is continuous.

[0079] like Figure 8 As shown, the filter press device includes a filter press frame, a first high-pressure plate, a filter press hydraulic cylinder, and a second high-pressure plate. The first high-pressure plate is installed on the filter press frame, and the filter press hydraulic cylinder is installed at the bottom end of the first high-pressure plate. The output end of the filter press hydraulic cylinder faces downward and is connected to the second high-pressure plate. The filter pressing area is located below the second high-pressure plate.

[0080] The filter press frame is equipped with multiple positioning slots arranged vertically. The first high pressure plate and the second high pressure plate are respectively connected to a fixed positioning device that can be installed on any positioning slot. The fixed positioning device is detachably connected to the positioning slot.

[0081] The hydraulic cylinder for filter presses can also be replaced with a pneumatic cylinder.

[0082] The fixed positioning device includes a positioning hydraulic cylinder and a positioning key. Sliding guide rails are fixedly installed on the first high-pressure plate and the second high-pressure plate, respectively. The positioning key is slidably connected to the sliding guide rails. The positioning hydraulic cylinder is connected to the positioning key and drives the positioning key to slide along the sliding guide rails. The sliding direction of the positioning key is horizontal. The filter press frame includes a vertical support rod. The first high-pressure plate and the second high-pressure plate are slidably connected to the support rod, and the support rod is provided with multiple positioning slots that can cooperate with the positioning key.

[0083] The positions of multiple positioning keys are adapted to the stroke of the filter press hydraulic cylinder. At the start of filtration, the first high-pressure plate is in its initial position and is fixed by the positioning keys engaging in the corresponding positioning slots. The second high-pressure plate can then slide along the support rod. The filter press hydraulic cylinder operates, driving the second high-pressure plate downwards for filtration. After one stroke, the positioning hydraulic cylinder on the second high-pressure plate engages, causing the positioning key at that location to engage in the positioning slot, thus fixing the second high-pressure plate. Meanwhile, the positioning key on the first high-pressure plate disengages from its positioning slot, and the filter press hydraulic cylinder retracts, causing the first high-pressure plate to move downwards one stroke. Then, the positioning key on the first high-pressure plate engages again in its positioning slot, and the upper positioning key on the second high-pressure plate disengages. This process is repeated, with the first high-pressure plate, the second high-pressure plate, and the filter press hydraulic cylinder all gradually moving downwards along the filter press frame, achieving deep filtration and dewatering.

[0084] The unloading system includes two unloading guide rollers and two scraper rollers. The filter belt passes between the two unloading guide rollers, and the upper and lower filter belts pass around the two scraper rollers respectively. The scraper rollers are equipped with scraper blades on their outer sides, which scrape off the material on the filter belt by adhering to the filter belt.

[0085] After receiving the multi-layered water-containing material from the filter press, the discharge frame rises to block the inlet. The discharge frame rotates around its pivot point. When the rotation angle exceeds 90°, the multi-layered water-containing material inside the discharge frame begins to tilt towards the top. At this point, the minimum tension is required for discharge. The multi-layered water-containing material under tension is automatically discharged via the scraper rollers of the unloading system. After unloading, the upper and lower filter belts move along the rollers wrapped with the second padding material on two roller assemblies, and then proceed to two cleaning devices for cleaning. After cleaning, they move back to the feeding system to begin the next round of feeding, achieving continuous operation.

[0086] The aforementioned delayed pressure filter belt dewatering equipment also includes a power system, which consists of several motors. The power system is connected to the limiting roller, the stacking roller, and the discharge guide roller, and drives them to rotate, thereby providing power for the cyclic movement of the filter belt.

[0087] A delayed-pressure filter belt dewatering method employs the aforementioned delayed-pressure filter belt dewatering equipment. The feeding system evenly distributes the water-containing material within the filter belt. The filter belt, encasing the material, enters a pre-compression forming system. The pre-compressed material then enters a stacking device along with the filter belt. The stacking device folds the filter belt into multiple layers of water-containing material. These multiple layers of water-containing material are conveyed to the filter press zone, where the filter press device squeezes and dewaters the multiple layers of water-containing material, resulting in multiple layers of dewatered material. The dewatered material is then conveyed to a discharge device. After the discharge device flips, the multiple layers of water-containing material are discharged layer by layer from the bottom to the unloading system for unloading. The unloaded filter belt encapsulates the water-containing material conveyed by the feeding system and returns to the pre-compression forming system, forming a cycle.

[0088] While the multi-layered water-containing material is squeezed and dewatered in the filter press zone, the multi-layered dewatered material from the previous cycle is sent from the discharge device to the unloading system for discharge, and the filter belt of the next cycle is folded in the stacking zone.

[0089] The specific process of the above dehydration method is as follows.

[0090] 1. The lower filter cloth is wound around the tension roller. After the feeding system evenly distributes the water-containing material, it moves together with the upper filter belt as the lower filter belt moves and overlaps with it, moving onto the pre-compression roller of the pre-compression forming system.

[0091] 2. In the pre-compression forming system, the water-containing material is subjected to high pressure at the corners of multiple pre-compression rollers wrapped by the first pad material, thus achieving pre-compression dehydration. Under the action of the tensioning hydraulic cylinder, the upper and lower filter belts wrapping the water-containing material are subjected to tension along with the first pad material, so that the thickness of the water-containing material in the filter belt gradually becomes uniform. After passing through multiple pre-compression rollers, the power roller transports the water-containing material with uniform thickness along the filter belt to the multi-layer delayed pressure filtration system.

[0092] Third, the filter belt carrying the water-containing material is then kept in a straight line by the constraint roller and the limit roller and passes through the stacking roller. The stacking roller moves back and forth on the fabric screw to stack the material. The required fabric height varies depending on the properties of the water-containing material. The fabric height is adjusted by the height adjustment component driving the base plate. When the stacking roller moves back and forth along the horizontal screw to stack the material, it stacks multiple layers of material from bottom to top along the vertical screw until the preset height is reached, thus completing the multi-layer fabrication and forming a multi-layer water-containing material for delayed pressure filtration.

[0093] IV. After the multi-layered water-containing material reaches the preset height, it is conveyed to the filter press zone by the conveying device to begin dewatering. The second high-pressure plate contacts the multi-layered water-containing material to apply pressure. As the pressure increases, the filter press hydraulic cylinder and the second high-pressure plate gradually move downward along the filter press frame. The pressure plate installed inside the conveying device contacts the conveying device and serves as a support element for the multi-layered water-containing material. It bears the pressure applied to the multi-layered water-containing material by the filter press hydraulic cylinder to achieve material dewatering. The required material height varies depending on the type of water-containing material. The initial height of the filter press hydraulic cylinder can be determined by the installation position of the fixed positioning device.

[0094] 5. After being filtered by the hydraulic cylinder, the multi-layered water-containing material is transported to the discharge frame with the opening of the silo door as the conveying device rotates. The multi-layered water-containing material passes through the transition plate, and the first and second conveyor belt mechanisms transport it to the discharge frame. After all the multi-layered water-containing material has been conveyed to the discharge frame, the filter belt passes around the feed guide roller under the action of the roller shutter assembly, and the roller shutter closes the feed port.

[0095] VI. The multi-layered water-containing material is ready to be discharged in the sealed discharge frame. As the tilting motor starts, the rotating shaft drives the discharge frame to start rotating. At the same time, the limit hydraulic cylinder extends to cooperate with the rotation of the discharge frame. As the rotation angle of the discharge frame gradually increases, the discharge guide roller rotates and generates tension to pull the filter belt outward. During the rotation of the discharge frame, the tension required for discharge gradually decreases. When the angle rotates to more than 90°, the multi-layered water-containing material begins to tilt towards the top of the discharge frame. At this time, the tension required for discharge is the smallest, which is most conducive to discharge. The filter belt is sent out from the discharge guide roller, and then discharged through the unloading guide roller and scraper roller. After the filter belt passes through the scraper guide roller, the upper filter belt and the lower filter belt separate and are automatically discharged through the scraper roller respectively.

[0096] 7. After automatic unloading, the upper and lower roller assemblies, which form a closed-loop structure with the second padding material, guide the upper and lower filter belts to two cleaning devices for cleaning. After cleaning, the upper and lower filter belts move along the upper roller and multiple lower rollers to the feeding system to begin secondary material distribution and dewatering.

[0097] The above embodiments are preferred embodiments of the invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A delayed-time filter press belt dewatering device, characterized in that: It includes a feeding system, a pre-compression forming system, a multi-layer delayed filter press system, a discharge system, and a filter belt. The filter belt passes through the pre-compression forming system, the multi-layer delayed filter press system, and the discharge system to form a closed-loop structure. The feeding system is used to feed the material into the filter belt, the pre-compression forming system is used to pre-compress and dewater the material, and the discharge system is used to unload the material from the filter belt. The multi-layer delayed pressure filter system includes a fabric stacking device, a filter press device, a discharge device, and a conveying device. The conveying device is equipped with a fabric stacking area and a filter press area. The installation positions of the fabric stacking device and the filter press device correspond to the fabric stacking area and the filter press area, respectively. The fabric stacking device is used to fold the filter belt back and forth into multiple layers of water-containing material. The conveying device is used to transfer the multiple layers of water-containing material between the fabric stacking area, the filter press area, and the discharge device. The filter press device is used to squeeze the multiple layers of water-containing material to obtain multiple layers of dewatered material. The discharge device is used to send out the multiple layers of dewatered material in a belt shape. The conveying device includes a first conveyor belt mechanism and a pressure bearing body. The stacking area and the filter pressing area are arranged one after the other on the first conveyor belt mechanism. The discharge device is connected to the rear end of the first conveyor belt mechanism. The pressure bearing body is located below the filter pressing area. The discharge device includes a second conveyor belt mechanism for receiving multi-layer dewatered materials. The discharge device also includes a discharge frame that can rotate along a horizontal axis. A second conveyor belt mechanism is installed at the bottom of the discharge frame. The discharge frame is used to accommodate multiple layers of dewatered material. The rotation angle of the discharge frame is not less than 30°. The discharge device also includes a tilting frame, a rotating shaft, a tilting motor, and a roller shutter assembly. The discharge frame is fixedly connected to the rotating shaft, which is rotatably connected to the tilting frame via bearings. The tilting motor is mounted on the tilting frame, connected to the rotating shaft, and drives the rotating shaft to rotate. The axis of the rotating shaft is horizontal. The discharge frame has a feed inlet, through which multi-layer dewatered materials enter the discharge frame and are conveyed to the second conveyor belt mechanism. The roller shutter assembly includes a drum and a roller shutter motor. The roller shutter motor is mounted on the discharge frame and connected to the drum. A flexible roller shutter face is wound on the drum. The end of the roller shutter face is connected to a feed guide roller. A track is provided on the side of the feed inlet, and the roller shutter face is slidably connected to the track. The rotation of the roller shutter motor drives the drum to rotate, thereby driving the roller shutter face to move along the track. The fabric folding device includes a fabric folding frame, a limiting roller, a constraint roller, a fabric folding roller, a horizontal moving assembly, and a height adjusting assembly; The filter belt containing the material passes through the limiting roller, the constraint roller, and the stacking roller in sequence. The limiting roller is installed on the stacking frame, and the constraint roller is located below the limiting roller. The stacking roller is installed on the stacking frame through a horizontal moving component and a height adjusting component. The horizontal moving component drives the stacking roller to move back and forth horizontally, and the height adjusting component drives the stacking roller to move up and down. The constraint roller is connected to the height adjusting component and moves up and down synchronously with the stacking roller.

2. The delayed-time filter belt dewatering device according to claim 1, characterized in that: The feeding system includes a material bin, a geared motor, an active material roller, a driven material roller, and a transmission gear set. The geared motor is connected to the active material roller and drives it to rotate. The active material roller is connected to the driven material roller via the transmission gear set. A material feeding channel is formed between the active and driven material rollers. The material feeding channel is directly opposite the entrance of the material bin, and the material falls from the material feeding channel onto the pre-compression forming system.

3. The delayed-time filter belt dewatering device according to claim 1, characterized in that: The pre-compression forming system includes a pre-compression frame, an upper pre-compression assembly, and a lower pre-compression assembly. Both the upper and lower pre-compression assemblies include a tension roller, a pre-compression roller, a power roller, and a first pad. The tension roller, pre-compression roller, and power roller are rotatably mounted on the pre-compression frame. The first pad is a strip structure with its ends connected and wraps around the outside of the tension roller, pre-compression roller, and power roller. Both the upper and lower pre-compression components have multiple pre-compression rollers arranged alternately. The filter belt carrying the material passes around the multiple pre-compression rollers in an S-shape and exits between the power rollers of the upper and lower pre-compression components.

4. The delayed-time filter belt dewatering device according to claim 1, characterized in that: It also includes an upper idler assembly and a lower idler assembly. Both the upper and lower idler assemblies include a second pad and multiple idlers. The second pad is a strip structure with its ends connected and wrapped around the outside of the multiple idlers. The filter belt includes an upper filter belt and a lower filter belt. The outlet of the feeding system faces the lower filter belt. The feeding system feeds the material onto the lower filter belt. The upper and lower filter belts sandwich the material in the middle and pass through a pre-compression forming system, a multi-layer delayed pressure filtration system, and a discharge system. After passing through the discharge system, the upper and lower filter belts separate. The upper filter belt returns to the pre-compression forming system after bypassing the upper idler assembly, and the lower filter belt returns to the pre-compression forming system after bypassing the lower idler assembly.

5. A delayed-time filter belt dewatering device according to claim 1, characterized in that: The filter press device includes a filter press frame, a first high-pressure plate, a filter press hydraulic cylinder, and a second high-pressure plate. The first high-pressure plate is mounted on the filter press frame, and the filter press hydraulic cylinder is mounted at the bottom end of the first high-pressure plate. The output end of the filter press hydraulic cylinder faces downward and is connected to the second high-pressure plate. The filter pressing area is located below the second high-pressure plate. The filter press frame is equipped with multiple positioning slots arranged vertically. The first high pressure plate and the second high pressure plate are respectively connected to a fixed positioning device that can be installed on any positioning slot. The fixed positioning device is detachably connected to the positioning slot.

6. A delayed-time filter belt dewatering method, employing the delayed-time filter belt dewatering equipment according to any one of claims 1-5, characterized in that: The feeding system evenly distributes the water-containing material in the filter belt. The filter belt, carrying the material, enters the pre-compression forming system. The pre-compressed material then enters the stacking device along with the filter belt. The stacking device folds the filter belt into multiple layers of water-containing material. These multiple layers of water-containing material are then conveyed to the filter press zone. The filter press device squeezes and dehydrates the multiple layers of water-containing material to obtain multiple layers of dehydrated material. These multiple layers of dehydrated material are then conveyed to the discharge device. After the discharge device flips over, the multiple layers of water-containing material are sent out layer by layer from the bottom to the unloading system for unloading. The unloaded filter belt then holds the water-containing material conveyed by the feeding system and returns to the pre-compression forming system, forming a cycle. While the multi-layered water-containing material is squeezed and dewatered in the filter press zone, the multi-layered dewatered material from the previous cycle is sent from the discharge device to the unloading system for discharge, and the filter belt of the next cycle is folded in the stacking zone.

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