Double-layer filter cloth distributing and discharging device

Abstract

The invention discloses a double-layer filter cloth distributing and discharging device which comprises a filter cloth winding and unwinding mechanism, a filter cloth stacking and conveying mechanism, a distributing mechanism and a discharging mechanism. The filter cloth winding and unwinding mechanism comprises an upper-layer filter cloth winding and unwinding mechanism and a lower-layer filter cloth winding and unwinding mechanism; the filter cloth stacking and conveying mechanism comprises a filter cloth lower conveying belt assembly and a filter cloth upper compression roller assembly, and the whole filter cloth lower conveying belt assembly is installed on the rack through a filter cloth lower conveying belt translation guide pushing assembly arranged in the conveying direction of a filter cloth conveying belt; a filter cloth upper compression roller assembly at least comprising a driven filter cloth upper compression roller is mounted on the filter cloth lower conveying belt assembly through a compression roller lifting assembly; the material distributing mechanism comprises a material distributor which is positioned and mounted on the filter cloth lower conveying belt assembly; and the discharging mechanism comprises a filter cake collecting bin which is correspondingly positioned below the lower-layer filter cloth winding and unwinding roller. According to the invention, automatic thin-layer uniform stacking and distribution of double-layer filter cloth can be realized before filter pressing operation, and automatic discharge of filter cakes can be realized after filter pressing operation.

Description

Technical Field

[0001] This invention relates to a cloth discharge device, specifically a double-layer filter cloth cloth discharge device suitable for dewatering relatively viscous solid waste materials such as sludge and coal tailings slag, and belongs to the field of viscous solid waste dewatering technology. Background Technology

[0002] River sludge, manhole sludge, and other domestic sewage sludge solid waste, as well as industrial sludge solid waste such as papermaking sludge, printing and dyeing sludge, coal slime, and tailings slag, medicinal residue from the pharmaceutical industry, distiller's grains from the brewing industry, animal manure from the livestock industry, mushroom beds from the edible fungi industry, wood pulp from the papermaking industry, and domestic waste solid waste from the waste disposal industry—all these relatively viscous materials require dewatering before reuse. Taking sewage sludge solid waste as an example, sludge treatment involves the process of reducing, stabilizing, and rendering harmless the sludge through concentration, conditioning, dewatering, stabilization, drying, or incineration. The dewatering process generally involves initial dewatering (the moisture content of the treated sludge is around 60%), followed by heat exchange drying to further reduce the moisture content (the moisture content of the dried sludge can generally be controlled below 20%).

[0003] For the dewatering of viscous solid waste, existing technologies typically employ filter presses such as plate and frame filter presses, variable diameter spiral filter presses, and chain belt filter presses, which achieve the effect of squeezing and filtering water from viscous solid waste by changing the pressure volume. Chain belt filter presses used in conjunction with filter cloth are commonly used sludge filter presses in the industry because they have both squeezing and conveying functions.

[0004] Existing chain belt filter presses used in conjunction with filter cloth typically include a lower chain belt assembly for conveying materials in the forward and backward direction. The lower chain belt assembly includes a chain belt connected end to end in a closed loop and a chain belt drive mechanism. The front or rear end of the lower chain belt assembly is a material feeding station or a material discharge station. The filter cloth laid flat on the chain belt typically includes upper and lower layers of filter cloth, and the upper and lower filter cloths are respectively conveyed synchronously and in the same direction as the chain belt through the filter cloth drive mechanism. The viscous solid waste material is arranged between the upper and lower filter cloths. The upper and lower filter cloths are separated at the material feeding station and the material discharge station to facilitate the material feeding of the viscous solid waste material and the discharge of the filter cake after pressing. In this type of traditional filter cloth chain filter press, the feeding device located above the feeding station typically only spreads a certain thickness of viscous solid waste material on the lower layer of filter cloth at the feeding station. To increase the throughput and improve the filtration efficiency of a single filtration operation, this certain thickness of viscous solid waste material is usually laid quite thickly. This causes two problems during the filtration process: firstly, the thicker viscous solid waste material is prone to escape from the gaps between the left and right sides of the upper and lower layers of filter cloth; secondly, since viscous solid waste is usually heterogeneous, that is, the particles contained in the material are of different sizes, the dewatering effect of large-volume filtration is usually not ideal, and the water content of the solid waste is usually still around 60% to 70% after dewatering.

[0005] Experiments have shown that the dewatering effect of viscous solid waste material forming a thin layer of material (less than 20 mm) is far better than that of viscous solid waste material forming a thick layer of material (more than 30 mm). However, the volume of material filtered in a single press is smaller and the filtration efficiency is lower. Therefore, existing technologies include cloth-laying devices that stack thin layers of material before pressing with a press cage. However, these devices typically involve laying the material on a single layer of filter cloth and then stacking the single layer of filter cloth containing the material. This method of stacking single layers of filter cloth causes directional changes due to the back-and-forth stacking. Therefore, to ensure unidirectional discharge of the filter cake after pressing, the cloth-laying process usually only adopts a unidirectional approach. The current method of layering filter cloths not only requires frequent control of the material pump, resulting in relatively low clothing efficiency, but also produces relatively small cloth volumes. Furthermore, the back-and-forth layering of cloths is usually completed directly inside the press cage, and the material discharged from the cloth distributor is directly spread onto the filter cloth. This causes the upper filter cloth to become uneven when the lower filter cloth receives the spread material and then the upper filter cloth is layered on top of the lower filter cloth, resulting in uneven material distribution. This increases the probability of material escaping from the gaps between the two adjacent layers of filter cloth. Therefore, the biggest problem with the existing method of layering single-layer filter cloths is that the filter cloth in the press cage leaks a lot during the filtration process, requiring frequent cleaning. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a double-layer filter cloth discharge device, which can automatically and uniformly stack the double-layer filter cloth in thin layers before the filter press operation and automatically discharge the filter cake after the filter press operation, thereby ensuring the dewatering effect while preventing material escape during the filter press process.

[0007] To achieve the above objectives, this double-layer filter cloth discharge device includes a filter cloth receiving and discharging mechanism, a filter cloth stacking and conveying mechanism, a cloth dispensing mechanism, and a discharge mechanism.

[0008] The filter cloth take-up and untake-down mechanism includes an upper filter cloth take-up and untake-down mechanism and a lower filter cloth take-up and untake-down mechanism arranged at intervals. The upper filter cloth take-up and untake-down mechanism includes an upper filter cloth take-up and untake-down roller and an upper filter cloth tensioning deflector roller that are rolled together and mounted on the frame. The upper filter cloth take-up and untake-down roller includes an upper filter cloth take-up and untake-down drive motor. The upper filter cloth is wound around the upper filter cloth take-up and untake-down roller to form an upper filter cloth roll. The lower filter cloth take-up and untake-down mechanism includes a lower filter cloth take-up and untake-down roller and a lower filter cloth tensioning deflector roller that are rolled together and mounted on the frame. The lower filter cloth take-up and untake-down roller includes a lower filter cloth take-up and untake-down drive motor. The lower filter cloth is wound around the lower filter cloth take-up and untake-down roller to form a lower filter cloth roll. When the lower filter cloth take-up and untake-down roller takes up the lower filter cloth, the lower filter cloth pulled out is located above the lower filter cloth roll.

[0009] The filter cloth stacking and conveying mechanism includes a lower filter cloth conveyor belt assembly and an upper filter cloth pressure roller assembly. The lower filter cloth conveyor belt assembly faces the cloth discharge station and includes a filter cloth conveyor belt connected end to end in a closed loop, a filter cloth conveyor belt tensioning and support mechanism, and a filter cloth conveyor belt drive mechanism with a drive motor. The conveying direction of the filter cloth conveyor belt is consistent with the take-up and untake-down direction of the upper and lower filter cloths. The entire lower filter cloth conveyor belt assembly is mounted on the frame by a filter cloth lower conveyor belt translation guide and push assembly set along the conveying direction of the filter cloth conveyor belt. The upper filter cloth pressure roller assembly includes at least a driven upper filter cloth pressure roller and is mounted on the lower filter cloth conveyor belt assembly by a pressure roller lifting assembly.

[0010] The fabric feeding mechanism includes a fabric feeder connected to the material feeding pipeline. The fabric feeder is positioned and installed on the lower conveyor belt assembly of the filter cloth, and the fabric feeder is located between the filter cloth take-up and release mechanism and the upper pressure roller assembly of the filter cloth.

[0011] The discharge mechanism is fixedly installed on the frame, including a filter cake collection bin located below the lower filter cloth take-up and take-up roller.

[0012] As a further improvement of the present invention, the filter cloth lower conveyor belt assembly and the filter cloth lower conveyor belt translation guide and push assembly are installed on the frame as a whole through the filter cloth lower conveyor belt lifting assembly.

[0013] As a further improvement of the present invention, the upper filter cloth receiving and / or discharge mechanism is further provided with a filter cake cleaning scraper installed on the frame.

[0014] As a further improvement of the present invention, the filter cloth upper pressure roller assembly also includes an active filter cloth upper pressure roller with a drive motor, whose axial direction is consistent with that of the driven filter cloth upper pressure roller.

[0015] As a further improvement of the present invention, multiple tensioning and redirecting rollers are provided for the lower filter cloth. The height of the lower filter cloth after it passes over the tensioning and redirecting rollers and is tensioned is flush with the lower conveyor belt of the filter cloth.

[0016] As a further improvement of the present invention, the setting height of the lower filter cloth take-up and untake-up roller is lower than the setting height of the filter cloth lower conveyor belt assembly.

[0017] Compared with existing technologies, this double-layer filter cloth discharging device simultaneously controls the forward rotation of the upper and lower filter cloth retraction drive motors during the cloth discharging process, releasing the upper and lower filter cloths. Simultaneously, it activates the forward rotation of the filter cloth conveyor belt drive mechanism, causing the conveyor belt to transport the filter cloth forward. The upper and lower filter cloths are then synchronously conveyed forward under the drive of the conveyor belt and the pressure roller assembly on the filter cloth. The material requiring dewatering is spread on the lower filter cloth and moves forward with it. When the material to be dewatered by pressure filtration approaches the pressure roller assembly on the filter cloth, it is evenly spread between the upper and lower filter cloths under the pressure of the roller assembly, achieving uniform material distribution between the two layers of filter cloth. By reasonably controlling the pumping rate of the material conveying pump, and the synchronous conveying speed of the upper and lower filter cloths and the filter cloth conveyor belt, the material thickness between the upper and lower filter cloths after distribution can be controlled to be less than 20 mm, thus achieving thin and uniform material distribution between the two layers of filter cloth. While evenly distributing the filter cloth, the movement of the lower conveyor belt translation and guiding component can be controlled to ensure the entire lower conveyor belt assembly moves slowly and uniformly forward and backward. This allows for the stacking of double-layer filter cloth at the discharge station. The thin, even distribution and stacking method ensures effective dewatering while preventing material escape. During discharge, the lifting and pressure application component is controlled, and the material conveyor belt drive mechanism of the material conveying component is activated to transport the material conveyor belt backward a set distance for resetting. Simultaneously, the upper... The upper and lower filter cloths are continuously rotated in opposite directions by the upper and lower filter cloths. During the recycling process, the upper and lower filter cloths separate as they pass through the lower filter cloth conveyor belt assembly. The filter cake between the upper and lower filter cloths is retained on the lower filter cloth under its own gravity and finally falls into the filter cake collection bin when the lower filter cloth is recycled and wrapped around the lower filter cloth recycling roller. This can realize automatic discharge of filter cake and is especially suitable for dewatering viscous solid waste in conjunction with a filter press. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the double-layer filter cloth discharge device of the present invention in conjunction with the filter press;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention after the outer cover is removed.

[0020] In the diagram: 1. Filter press; 11. Material conveying assembly; 12. Pressing assembly; 2. Double-layer filter cloth discharge device; 21. Upper filter cloth take-up and undo mechanism; 211. Upper filter cloth take-up and undo roller; 22. Lower filter cloth take-up and undo mechanism; 221. Lower filter cloth take-up and undo roller; 23. Filter cloth stacking conveying mechanism; 231. Lower filter cloth conveyor belt assembly; 232. Upper filter cloth pressure roller assembly; 24. Clothing mechanism; 241. Clothing distributor. Detailed Implementation

[0021] The invention will be further described below with reference to the accompanying drawings, taking the example of installing the double-layer filter cloth discharge device 2 at the cloth discharge station of the filter press 1. Figure 2 (The right-hand direction is described as the front).

[0022] like Figure 1 As shown, the filter press 1 includes a material conveying assembly 11 and a pressure application assembly 12 mounted on a frame. The material conveying assembly 11 may include a material conveyor belt connected end to end in a closed loop, a material conveyor belt tensioning and support mechanism, and a material conveyor belt drive mechanism with a drive motor. The material conveyor belt that conveys material in the front-back direction may be a chain belt structure or a rubber belt structure. The position directly below the pressure application assembly 12 corresponding to the material conveyor belt is the filter press station. The positions directly in front of and / or directly behind the filter press station corresponding to the material conveyor belt are the material discharge stations. That is, at least one material discharge station is set in front of or directly behind the filter press station. Alternatively, one material discharge station may be set in front of and one in rear of the filter press station to improve efficiency.

[0023] The double-layer filter cloth discharge device 2 is set up corresponding to the cloth discharge station. When one cloth discharge station is set up directly in front of or behind the filter press station, one set of double-layer filter cloth discharge device 2 can be set up accordingly. When one cloth discharge station is set up directly in front of and one set up directly behind the filter press station, two sets of double-layer filter cloth discharge devices 2 can be set up accordingly. The double-layer filter cloth discharge device 2 can correspond to the cloth discharge station in the front-to-back direction or in the left-to-right direction. Figure 2 As shown, the double-layer filter cloth discharge device 2 includes a filter cloth receiving and discharging mechanism, a filter cloth stacking and conveying mechanism 23, a cloth dispensing mechanism 24, and a discharge mechanism.

[0024] The filter cloth take-up and untake-down mechanism includes an upper filter cloth take-up and untake-down mechanism 21 and a lower filter cloth take-up and untake-down mechanism 22, which are arranged at intervals. The upper filter cloth take-up and untake-down mechanism 21 includes an upper filter cloth take-up and untake-down roller 211 and an upper filter cloth tensioning deflector roller, which are rolled together on the frame. The axial directions of the upper filter cloth take-up and untake-down roller 211 and the upper filter cloth tensioning deflector roller are aligned. The upper filter cloth take-up and untake-down roller 211 includes an upper filter cloth take-up and untake-down drive motor. The upper filter cloth is wound around the upper filter cloth take-up and untake-down roller 211 to form an upper filter cloth roll. The upper filter cloth drawn from the upper filter cloth roll is tensioned and deflected by the upper filter cloth tensioning deflector roller before being output. The lower filter cloth take-up and untake-down mechanism 22... The feeding mechanism 22 includes a lower filter cloth take-up and feed roller 221 and a lower filter cloth tensioning redirecting roller, which are rolled and mounted on the frame. The lower filter cloth take-up and feed roller 221 and the lower filter cloth tensioning redirecting roller are aligned with the axial direction of the upper filter cloth take-up and feed roller 211 and the upper filter cloth tensioning redirecting roller. The lower filter cloth take-up and feed roller 221 includes a lower filter cloth take-up and feed drive motor. The lower filter cloth is wound around the lower filter cloth take-up and feed roller 221 to form a lower filter cloth roll. When the lower filter cloth take-up and feed roller 221 takes up the lower filter cloth, the lower filter cloth pulled out is located above the lower filter cloth roll. The lower filter cloth is tensioned and redirected by the lower filter cloth tensioning redirecting roller before being output.

[0025] The filter cloth stacking and conveying mechanism 23 includes a lower filter cloth conveyor belt assembly 231 and an upper filter cloth pressure roller assembly 232. The lower filter cloth conveyor belt assembly 231 faces the cloth discharge station. The lower filter cloth conveyor belt assembly 231 includes a filter cloth conveyor belt connected end to end in a closed loop, a filter cloth conveyor belt tensioning support mechanism, and a filter cloth conveyor belt drive mechanism with a drive motor. The filter cloth conveyor belt can be a chain belt structure or a rubber belt structure. The conveying direction of the filter cloth conveyor belt is consistent with the take-up and untake-up direction of the upper and lower filter cloths. The entire lower filter cloth conveyor belt assembly 231 is mounted on the frame by a lower filter cloth conveyor belt translation guide and push assembly set along the conveying direction of the filter cloth conveyor belt. The lower filter cloth conveyor belt translation guide and push assembly can be a telescopic cylinder transmission structure or a gear and rack transmission structure. Other linear reciprocating motion structures, such as moving structures, can control the movement of the filter cloth lower conveyor belt assembly 231 in the forward or reverse direction of the filter cloth conveyor belt by controlling the movement of the filter cloth lower conveyor belt translation guide pushing assembly; the filter cloth upper pressure roller assembly 232 includes at least a driven filter cloth upper pressure roller, and the axial direction of the driven filter cloth upper pressure roller is consistent with the axial direction of the upper filter cloth take-up roller 211. The filter cloth upper pressure roller assembly 232 is installed on the filter cloth lower conveyor belt assembly 231 through a pressure roller lifting assembly. The pressure roller lifting assembly can be a telescopic cylinder transmission structure, or a gear and rack transmission structure or other lifting structures that are matched. By controlling the movement of the pressure roller lifting assembly, the filter cloth upper pressure roller assembly 232 can be controlled to rise away from the filter cloth conveyor belt or fall close to the filter cloth conveyor belt;

[0026] The fabric feeding mechanism 24 includes a fabric feeder 241 connected to the material feeding pipeline. The fabric feeder 241 is positioned on the filter cloth lower conveyor belt assembly 231 and is located between the filter cloth take-up and release mechanism and the filter cloth upper pressure roller assembly 232. The fabric feeder 241 includes a fabric output port located at the middle position in the width direction of the filter cloth conveyor belt.

[0027] The discharge mechanism is fixedly installed on the frame, including a filter cake collection bin (not shown in the figure) located below the lower filter cloth take-up and untake-down roller 221.

[0028] When using a filter press 1 to filter viscous solid waste, the process includes three workflows: material preparation, material distribution, and filter pressing and filter cake discharge. The following describes the entire process using an example where a material discharge station is located directly behind the filter press, and a set of double-layer filter cloth material discharge devices 2 is installed along the front-to-back direction of the material discharge station (i.e., the axial directions of the upper filter cloth take-up roller 211 and the lower filter cloth take-up roller 221 are along the left-right direction, the filter cloth lower conveyor belt assembly 231 faces the material discharge station, and the conveying direction of the filter cloth conveyor belt is along the front-to-back direction).

[0029] a. Fabric Preparation: Before fabric preparation, first control the upper pressure roller assembly 232 of the filter cloth to rise away from the filter cloth conveyor belt, and control the lower conveyor belt translation guide push assembly to move the lower conveyor belt assembly 231 of the filter cloth to the rear and above (or directly above) the corresponding fabric discharge position. Then, pull out the filter cloth end of the upper layer filter cloth from above or below the upper layer filter cloth roll, and pull out the filter cloth end of the lower layer filter cloth from above the lower layer filter cloth roll. The upper... The upper and lower filter cloths are released by the forward rotation of the filter cloth take-up and release drive motors. The filter cloth ends of the upper and lower layers are sequentially passed around the upper and lower filter cloth tensioning guide rollers, respectively. The upper filter cloth is then pulled out from above the distributor 241, and the lower filter cloth is pulled out from the gap between the distributor 241 and the filter cloth conveyor belt. Finally, the upper and lower filter cloths are removed from the filter cloth upper pressure roller assembly 232 and... After pulling out the gap between the filter cloth conveyor belts and leaving enough allowance for the length of the filter cloth, the ends of the upper and lower filter cloths are laid flat and fixedly installed on the material conveyor belt at the cloth discharge station. The filter cloth pressure roller assembly 232 is controlled to descend and approach the filter cloth conveyor belt, so that the upper filter cloth is close to the lower filter cloth. The upper filter cloth retraction drive motor and the lower filter cloth retraction drive motor can be controlled to rotate in opposite directions to tension the upper and lower filter cloths. The initial position of the lower filter cloth relative to the filter cloth lower conveyor belt assembly 231 is set. To facilitate the spreading of the cloth, multiple lower filter cloth tensioning deflector rollers are set. The height dimension between the lower filter cloth tensioning deflector rollers and the filter cloth lower conveyor belt assembly 231 can be reasonably set so that the height dimension of the lower filter cloth after passing over the lower filter cloth tensioning deflector rollers and being tensioned is flush with the filter cloth lower conveyor belt. That is, the lower filter cloth can be laid flat on the filter cloth lower conveyor belt after passing over the lower filter cloth tensioning deflector rollers and being tensioned.

[0030] b. Fabric: The material conveying pump is started, and the material to be dewatered by pressure filtration enters the fabric distributor 241 through the feeding pipeline and is discharged through the fabric outlet. At the same time, the upper and lower filter cloth retraction drive motors are controlled to rotate forward to release the upper and lower filter cloths, and the drive motor of the filter cloth conveyor belt drive mechanism is started to rotate forward to transport the filter cloth forward. The upper and lower filter cloths are synchronously transported forward under the drive of the filter cloth conveyor belt and the filter cloth pressure roller assembly 232. The material to be dewatered by pressure filtration is spread on the lower filter cloth and moves forward with it. When the material to be dewatered by pressure filtration approaches the filter cloth pressure roller assembly 232, the material to be dewatered by pressure filtration is evenly spread between the upper and lower filter cloths under the roller pressure of the filter cloth pressure roller assembly 232, achieving uniform distribution between the two layers of filter cloth. By rationally controlling the pumping rate of the material conveying pump, the synchronous conveying speed of the upper and lower filter cloths and the filter cloth conveyor belt, the material thickness between the upper and lower filter cloths after the cloth is laid can be controlled to be less than 20 mm, thereby achieving thin and uniform cloth laying of the double-layer filter cloth. While laying the cloth evenly, the movement of the filter cloth lower conveyor belt translation guide push component can be controlled to make the filter cloth lower conveyor belt component 231 move forward slowly at a uniform speed (or move backward slowly at a uniform speed). When the filter cloth lower conveyor belt component 231 moves to directly above (or behind and above) the cloth discharge station, the movement of the filter cloth lower conveyor belt translation guide push component can be controlled to make the filter cloth lower conveyor belt component 231 move backward slowly at a uniform speed (or move forward slowly at a uniform speed). This process is repeated to achieve stacking of the double-layer filter cloths at the cloth discharge station after the cloth is laid.

[0031] c. Press Filtration: After the double-layer filter cloth is stacked to the set number of layers to form a stack, the material conveying pump is turned off and the filter cloth lower conveyor belt translation guide push component is activated to move the filter cloth lower conveyor belt component 231 to the rear and upper part of the corresponding cloth discharge station. At the same time, the material conveyor belt drive mechanism of the material conveying component 11 is activated to transport the material conveyor belt forward a set distance. Meanwhile, the upper filter cloth take-up and lower filter cloth take-up and lower filter cloth take-up and lower filter cloth continue to rotate forward to release the upper and lower filter cloth. The stack pulls the upper and lower filter cloth forward to the press filtration station. After leaving enough filter cloth press filtration margin, the upper filter cloth take-up and lower ...

[0032] d. Filter cake discharge: After the filter pressing operation is completed, control the lifting of the pressure application component 12, control the start of the material conveying component 11's material conveyor belt drive mechanism to move the material conveyor belt backward a set distance for reset, and control the action of the filter cloth lower conveyor belt translation guide push component to reset the filter cloth lower conveyor belt component 231 to its initial position. At the same time, control the filter cloth upper pressure roller component 232 to rise a set distance to facilitate the subsequent separation of the upper and lower filter cloths. Then, control the upper and lower filter cloth retraction drive motors to rotate continuously in opposite directions to retract the upper and lower filter cloths. While retracting the upper and lower filter cloths, control the start of the filter cloth conveyor belt drive mechanism's drive motor to rotate in opposite directions to move the filter cloth conveyor belt backward. The press filter stack is then moved to the cloth discharge station. During the recycling process, the upper and lower filter cloths separate when passing through the filter cloth lower conveyor belt assembly 231. The filter cake between the upper and lower filter cloths is retained on the lower filter cloth under its own gravity and finally falls into the filter cake collection bin when the lower filter cloth is recycled and wrapped around the lower filter cloth take-up roller 221. To facilitate the filter cake falling into the filter cake collection bin by itself, the setting height of the lower filter cloth take-up roller 221 can be lower than the setting height of the filter cloth lower conveyor belt assembly 231. After the lower filter cloth returns to the initial position, the drive motors of the upper filter cloth take-up drive motor, the lower filter cloth take-up drive motor, and the filter cloth conveyor belt drive mechanism are turned off to complete the entire filter cloth rewinding and filter cake discharge operation.

[0033] To improve efficiency, as a further improvement of the present invention, a cloth discharge station can be set up directly in front of and behind the filter press station, and two sets of double-layer filter cloth discharge devices 2 can be set up accordingly. During cloth preparation, the filter cloth ends of the upper and lower layers of the double-layer filter cloth discharge device 2 located behind (or in front of) the filter press station can be laid flat and fixedly installed on the material conveyor belt of the cloth discharge station located behind (or in front of) the filter press station. The filter cloth ends of the upper and lower layers of the double-layer filter cloth discharge device 2 located in front of (or behind) the filter press station can also be laid flat and fixedly installed on the material conveyor belt of the cloth discharge station located behind (or in front of) the filter press station, that is, the filter cloth ends of the upper and lower layers of the double-layer filter cloth discharge device 2 located behind and in front of the filter press station can be laid flat and fixedly installed over the filter press station. The double-layer filter cloth is laid flat and fixedly installed on the material conveyor belt at the same cloth discharge station located in front of or behind the filter press station. This allows the double-layer filter cloth discharge device 2 located in front of (or behind) the filter press station to complete the layering and feeding of the cloth into the filter press station for filtration. At the same time, the double-layer filter cloth discharge device 2 located behind (or in front of) the filter press station can simultaneously perform layering during the filtration process. After the filtration is completed, the stack is sent out and returned to the double-layer filter cloth discharge device 2 located in front of (or behind) the filter press station for filter cake discharge. Meanwhile, the stack of double-layer filter cloth discharge device 2 located behind (or in front of) the filter press station is sent into the filter press station for filtration. This enables continuous and uninterrupted filtration, avoids waiting time for cloth feeding during filtration, and improves efficiency.

[0034] To achieve better layering and filter cake discharge effects, as a further improvement of the present invention, the filter cloth lower conveyor belt assembly 231 and the filter cloth lower conveyor belt translation and guiding push assembly are mounted on the frame via the filter cloth lower conveyor belt lifting assembly. The filter cloth lower conveyor belt lifting assembly can be a lifting structure including a telescopic cylinder and a guide column, or it can be a scissor lifting structure or other linear lifting structures. By controlling the movement of the filter cloth lower conveyor belt lifting assembly, the filter cloth lower conveyor belt assembly 231 can be stepped up and down according to the increase or decrease of the number of cloth layers during the cloth application or filter cake discharge operation, thereby achieving better layering and filter cake discharge effects.

[0035] Because of thin-layer filtration, the filter cake after dewatering is thin and lightweight. To prevent the filter cake from sticking to the upper and / or lower filter cloth during the filter cake discharge operation, as a further improvement of the present invention, the upper filter cloth receiving and / or discharge mechanism is also equipped with a filter cake cleaning scraper mounted on the frame. The filter cake cleaning scraper of the upper filter cloth receiving and / or discharge mechanism is positioned above the corresponding filter cloth lower conveyor belt assembly 231, and the filter cake cleaning scraper of the discharge mechanism is positioned at the position corresponding to the lower filter cloth receiving and discharging roller 221 in the filter cake collection bin. During the filter cake discharge operation, when the upper and lower filter cloths are separated by the filter cloth lower conveyor belt assembly 231 during the recycling process, the filter cake cleaning scraper of the upper filter cloth receiving and discharging mechanism can scrape the filter cake stuck to the upper filter cloth onto the lower filter cloth, and the filter cake cleaning scraper of the discharge mechanism can scrape the filter cake stuck to the lower filter cloth into the filter cake collection bin.

[0036] In order to achieve a better rolling and flat laying effect during the fabric application process, as a further improvement of the present invention, the filter cloth upper pressure roller assembly 232 also includes an active filter cloth upper pressure roller with a drive motor whose axial direction is consistent with that of the driven filter cloth upper pressure roller. During the fabric application process, the active filter cloth upper pressure roller can be controlled to rotate synchronously with the conveying speed of the filter cloth conveyor belt, and the rotation direction of the active filter cloth upper pressure roller is opposite to the rotation direction of the drive motor of the filter cloth conveyor belt drive mechanism, that is, a counter-rolling effect is formed, which can achieve a better rolling and flat laying effect.

[0037] This double-layer filter cloth feeding device can control the material thickness between the upper and lower filter cloths to less than 20 mm after feeding, thereby achieving thin and uniform feeding of the double-layer filter cloth. It can also stack the double-layer filter cloths after feeding. The thin and uniform feeding and stacking method can prevent material escape while ensuring the dewatering effect. At the same time, it can realize automatic discharge of filter cake from the filter cloth. It is particularly suitable for dewatering viscous solid waste in conjunction with a filter press.

Claims

1. A double-layer filter cloth cloth discharging device, characterized by, The double-layer filter cloth discharge device (2) includes a filter cloth receiving and discharging mechanism, a filter cloth stacking and conveying mechanism (23), a cloth dispensing mechanism (24), and a discharge mechanism; The filter cloth take-up and put-down mechanism includes an upper filter cloth take-up and put-down mechanism (21) and a lower filter cloth take-up and put-down mechanism (22) arranged at intervals. The upper filter cloth take-up and put-down mechanism (21) includes an upper filter cloth take-up and put-down roller (211) and an upper filter cloth tensioning deflector roller, which are rolled together and mounted on the frame. The upper filter cloth take-up and put-down roller (211) includes an upper filter cloth take-up and put-down drive motor. The upper filter cloth is wound around the upper filter cloth take-up and put-down roller (211) to form an upper filter cloth roll. The lower filter cloth take-up and put-down mechanism (22) includes a lower filter cloth take-up and put-down roller (221) and a lower filter cloth tensioning deflector roller, which are rolled together and mounted on the frame. The lower filter cloth take-up and put-down roller (221) includes a lower filter cloth take-up and put-down drive motor. The lower filter cloth is wound around the lower filter cloth take-up and put-down roller (221) to form a lower filter cloth roll. When the lower filter cloth take-up and put-down roller (221) takes up the lower filter cloth, the lower filter cloth pulled out is located above the lower filter cloth roll. The filter cloth stacking and conveying mechanism (23) includes a filter cloth lower conveyor belt assembly (231) and a filter cloth upper pressure roller assembly (232). The filter cloth lower conveyor belt assembly (231) is directly opposite the cloth discharge station. The filter cloth lower conveyor belt assembly (231) includes a filter cloth conveyor belt connected end to end in a closed loop, a filter cloth conveyor belt tensioning support mechanism, and a filter cloth conveyor belt drive mechanism with a drive motor. The conveying direction of the filter cloth conveyor belt is consistent with the take-up and untake-up direction of the upper and lower filter cloths. The filter cloth lower conveyor belt assembly (231) is installed on the frame as a whole by a filter cloth lower conveyor belt translation guide push assembly set along the conveying direction of the filter cloth conveyor belt. The filter cloth upper pressure roller assembly (232) includes at least a driven filter cloth upper pressure roller. The filter cloth upper pressure roller assembly (232) is installed on the filter cloth lower conveyor belt assembly (231) by a pressure roller lifting assembly. The fabric feeding mechanism (24) includes a fabric feeder (241) connected to the material feeding pipeline. The fabric feeder (241) is positioned on the filter cloth lower conveyor belt assembly (231) and is located between the filter cloth take-up and release mechanism and the filter cloth upper pressure roller assembly (232). The discharge mechanism is fixedly installed on the frame, including a filter cake collection bin located below the lower filter cloth take-up roller (221).

2. The dual layer cloth material discharging apparatus according to claim 1, wherein The filter cloth under conveyor belt assembly (231) and the filter cloth under conveyor belt translation guide and push assembly are installed on the frame through the filter cloth under conveyor belt lifting assembly.

3. The double cloth discharge apparatus according to claim 1 or 2, characterized by The upper filter cloth receiving and discharging mechanism (21) and / or the discharge mechanism are also equipped with filter cake cleaning scrapers installed on the frame.

4. The double cloth discharge apparatus according to claim 1 or 2, characterized by The filter cloth upper pressure roller assembly (232) also includes an active filter cloth upper pressure roller with a drive motor, whose axial direction is aligned with that of the driven filter cloth upper pressure roller.

5. The double cloth discharge apparatus according to claim 1 or 2, wherein Multiple tensioning deflector rollers are provided for the lower filter cloth. The height of the lower filter cloth after it is laid flat after passing over the tensioning deflector rollers and being tensioned is flush with the lower conveyor belt of the filter cloth.

6. The dual-layer cloth material discharging apparatus according to claim 1 or 2, wherein The height of the lower filter cloth take-up and untake-up roller (221) is lower than the height of the filter cloth lower conveyor belt assembly (231).

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