A belt filter press

Abstract

This application relates to the field of sludge treatment technology, specifically disclosing a belt filter press. The belt filter press includes a frame, an upper filter belt, a lower filter belt, several guide rollers, several first support rollers, several second support rollers, several squeeze rollers, and a pusher. The guide rollers, first support rollers, second support rollers, and squeeze rollers are parallel to each other. The guide rollers, first support rollers, and second support rollers are all fixed to the frame. The squeeze rollers are movably mounted to the frame. The upper filter belt is wound around the first support rollers, second support rollers, and some guide rollers. The lower filter belt is wound around the first support rollers, second support rollers, and other guide rollers. The upper and lower filter belts are tangent at each first support roller and each second support roller. The pusher connects to the squeeze rollers, so that the squeeze rollers and second support rollers clamp the tangent upper and lower filter belts. During sludge pressing, the sludge between the upper and lower filter belts is squeezed by the squeeze rollers, allowing more water to seep out, making it easier for the sludge to detach from the upper and lower filter belts, thus improving the efficiency of sludge pressing.

Description

Technical Field

[0001] This application relates to the field of sludge remediation technology, and more specifically, to a belt filter press. Background Technology

[0002] The process of river silt remediation includes pumping the river silt ashore, injecting it into a sedimentation tank, adding chemicals to precipitate and separate the supernatant, and then transporting the sedimented silt at the bottom to a belt filter press for further dewatering. The filter cake is then transported to a landfill via a belt conveyor.

[0003] Belt filter presses process sedimentary sludge with a moisture content of approximately 85%. After filtration, the sludge is reduced in volume and dried, resulting in sludge with a moisture content of approximately 55%-70%. Belt filter presses have advantages such as large processing capacity, continuous operation, convenient operation and maintenance, few auxiliary equipment, and low energy consumption, making them widely used in the environmental protection industry. However, the sludge after filtration still has a relatively high moisture content, making it prone to adhering to the filter belt. Even with scrapers, the sludge is difficult to remove, affecting the efficiency of the filter press in processing sludge. Furthermore, the high density of the filtered sludge leads to higher energy consumption during transportation or bagging, and also causes inconvenience due to adhesion to conveyor belts or bags. Summary of the Invention

[0004] Given that the sludge after filtration by a belt filter press still has a relatively high moisture content, it is easy to adhere to the filter belt and difficult to detach from it, thus affecting the efficiency of the filter press in processing sludge. Therefore, this application proposes a belt filter press and adopts the following technical solution.

[0005] A belt filter press includes a frame, an upper filter belt, a lower filter belt, a plurality of guide rollers, a plurality of first support rollers, a plurality of second support rollers, a plurality of squeeze rollers, and a pusher. All guide rollers, all first support rollers, all second support rollers, and all squeeze rollers are parallel to each other; both ends of each guide roller, both ends of each first support roller, and both ends of each second support roller are fixed to the frame; both ends of each squeeze roller are movably mounted to the frame. The upper filter belt is wound around the first support rollers, the second support rollers, and some of the guide rollers; the lower filter belt is wound around the first support rollers, the second support rollers, and some of the guide rollers; the upper and lower filter belts are tangent at each of the first and second support rollers. The pusher connects to the squeeze rollers, such that the squeeze rollers and the second support rollers clamp the tangent upper and lower filter belts.

[0006] By adopting the above technical solution, the belt filter press of this application, compared with a general belt filter press, adds a pushing component and a squeezing roller. The pushing component pushes the squeezing roller, so that the squeezing roller and the second support roller clamp the tangential upper filter belt and the lower filter belt. When filtering sludge, the sludge between the upper and lower filter belts is squeezed by the squeezing roller, allowing more water to seep out, thereby reducing the water content of the sludge and making it easier for the sludge to detach from the upper and lower filter belts. This gives the belt filter press of this application a higher efficiency in treating sludge. It should be noted that "fixed to the frame" means that the roller cannot move in position such as translation, single-end movement, or asynchronous movement at both ends. However, as a roller, it can rotate around its own central axis. That is, the roller is "fixed" to the frame here, but its rotation is not restricted.

[0007] In a preferred embodiment of the belt filter press, the first support roller is positioned above the second support roller, and both the upper filter belt and the lower filter belt between the first support roller and the second support roller are in a vertical direction.

[0008] By adopting the above technical solution, since the second support roller is squeezed by the compression roller while the first support roller is not, the upper and lower filter belts on the second support roller experience greater compression, resulting in more water seeping from the sludge at the second support roller. Therefore, placing the first support roller above the second support roller facilitates the water seeping from the second support roller to drip downwards instead of onto the second support roller. The upper and lower filter belts between the first and second support rollers are both vertical, making it easier for water to seep downwards. Furthermore, when the upper and lower filter belts wrapped around the second support roller are squeezed by the compression roller, they can also drip water smoothly downwards, improving the efficiency of sludge filtration.

[0009] In a preferred embodiment of the belt filter press, the pushing direction of the pushing member is horizontal.

[0010] By adopting the above technical solution, horizontal pushing can push the lower half-circular arc position of the second support roller, so that the pressure of the extrusion roller on the second support roller is greater and the water squeezing efficiency is higher. At the same time, the squeezed water is not easy to flow down the pushing part and is not easy to be collected.

[0011] In a preferred embodiment of the belt filter press, the extrusion roller presses against the outermost position of the second support roller in the horizontal direction.

[0012] By adopting the above technical solution, the outermost position of the second support roller in the horizontal direction is the position where the upper filter belt and the lower filter belt are tangent to the second support roller in the vertical direction. Since the pushing direction of the pushing member is perpendicular to the upper filter belt and the lower filter belt in the vertical direction, the vertical extrusion makes it easier to squeeze out the water from the sludge.

[0013] In a preferred embodiment of the belt filter press, the belt filter press has at least two extrusion rollers; the pushing member includes a first elastic member, and each end of the first elastic member is connected to one of the extrusion rollers; the extension and retraction direction of the first elastic member is perpendicular to the extrusion rollers; the first elastic member drives the extrusion rollers at both ends to press against the second support rollers on both sides respectively.

[0014] By adopting the above technical solution, two extrusion rollers are connected to a first elastic element, achieving a good extrusion effect through a simple structure.

[0015] In a preferred embodiment of the belt filter press, the pushing component includes a second elastic element, one end of which is connected to one of the extrusion rollers, and the other end is fixed to the frame; the extension and retraction direction of the second elastic element is perpendicular to the extrusion roller; the second elastic element drives the extrusion roller to press against the second support roller.

[0016] By adopting the above technical solution, a second elastic element is connected to a compression roller, which can achieve a good compression effect. This structure is particularly suitable for applying pressure to the outermost second support roller.

[0017] In a preferred embodiment of the belt filter press, the axis of each of the second support rollers and the axis of each of the extrusion rollers are located on the same horizontal line.

[0018] By adopting the above technical solution, each extrusion roller applies pressure from the same horizontal direction toward the center of the second support roller, resulting in high pressure. Furthermore, since the upper and lower filter belts between the first and second support rollers are both in the vertical direction, i.e., each extrusion roller abuts against the left or right side of the second support roller, the squeezed water can flow smoothly vertically downwards, or flow along the lower semicircle of the second support roller to the lowest point and detach from the upper and lower filter belts. The squeezed water is less likely to flow to other positions on the upper and lower filter belts, thus the belt filter press has a high water squeezing efficiency.

[0019] In a preferred embodiment of the belt filter press, the frame has horizontal slots on both sides; the two ends of each extrusion roller are movably mounted in the slots on both sides.

[0020] By adopting the above technical solution, each extrusion roller can move horizontally along the strip hole, thereby adapting the pressure to extrude the silt between the upper filter belt and the lower filter belt.

[0021] A preferred embodiment of the belt filter press is that the belt filter press further includes an upper drive and a lower drive; both the upper drive and the lower drive are mounted on the frame; the upper drive is connected to a guide roller that is wrapped around the upper filter belt; and the lower drive is connected to the guide roller that is wrapped around the lower filter belt.

[0022] By adopting the above technical solution, the upper driver drives the upper filter belt to rotate, and the lower driver drives the lower filter belt to rotate. By controlling the rotation speed of the upper driver and the lower driver, the linear speed of the upper filter belt and the lower filter belt can be the same, achieving synchronous operation and effectively clamping the sludge for water squeezing.

[0023] In a preferred embodiment of the belt filter press, the belt filter press further includes a water pan; the water pan is installed below all the first support rollers and all the second support rollers, and the edge of the water pan is located outside all the first support rollers and all the second support rollers.

[0024] By adopting the above technical solution, the water squeezed from the surfaces of all the first support rollers and all the second support rollers flows into the water pan, which can be used to rinse other devices and also prevents water from flowing into the lower filter belt and the ground below.

[0025] In summary, the belt filter press of this application, by adding a pushing component and a squeezing roller, allows the pushing component to drive the squeezing roller, which, along with the second support roller, clamps the tangential upper and lower filter belts. During sludge pressing, the sludge between the upper and lower filter belts is squeezed by the squeezing roller, allowing more water to seep out, thereby reducing the sludge's moisture content. This makes it easier for the sludge to detach from the upper and lower filter belts, resulting in a higher sludge processing efficiency for the belt filter press. The sludge filtered by this belt filter press can achieve a moisture content of less than 50%, making it less likely to adhere to the filter belt, thus improving the efficiency of sludge processing. It also facilitates transportation or bagging and reduces transportation energy consumption. Attached Figure Description

[0026] Figure 1 This is a side view of a belt filter press.

[0027] Figure 2 for Figure 1 The structural diagram of the belt filter press is hidden behind the frame.

[0028] Figure 3 for Figure 2 A three-dimensional image.

[0029] Figure 4 for Figure 1 The structural diagram of the frame in a belt filter press.

[0030] Reference numerals in the attached drawings: 1. Frame; 2. Upper filter belt; 3. Lower filter belt; 4. Directional roller; 5. First support roller; 6. Second support roller; 7. Extrusion roller; 8. Pushing component; 81. First elastic component; 82. Second elastic component; 101. Strip hole; 9. Upper driver; 10. Lower driver; 11. Water pan; 12. Inlet; 13. Outlet; 14. Scraper; 15. Guide plate. Detailed Implementation

[0031] The following description, in conjunction with the accompanying drawings, details some embodiments of the belt filter press of this application.

[0032] Please refer to Figure 1 A belt filter press includes a frame 1, an upper filter belt 2, a lower filter belt 3, several turning rollers 4, several first support rollers 5, several second support rollers 6, several extrusion rollers 7, and an extrusion component 8.

[0033] Please refer to Figure 2 All the steering rollers 4, all the first support rollers 5, all the second support rollers 6, and all the extrusion rollers 7 are parallel to each other.

[0034] Both ends of each steering roller 4, both ends of each first support roller 5, and both ends of each second support roller 6 are fixed to the frame 1. "Fixed to the frame 1" means that these rollers cannot be moved in position, such as translation, single-end movement, or asynchronous movement at both ends. However, as rollers, they can rotate around their own central axis. That is, the rollers here are "fixed" to the frame 1, but their rotation is not restricted.

[0035] Each extrusion roller 7 is movably mounted to the frame 1 at both ends. "Movably mounted to the frame 1" means that the two ends of the extrusion roller 7 can change position relative to the frame 1, including translation, and not just rotation.

[0036] Please refer to Figure 3 The upper filter belt 2 is wound around the first support roller 5, the second support roller 6, and some upper guide rollers 4. The lower filter belt 3 is wound around the first support roller 5, the second support roller 6, and some lower guide rollers 4.

[0037] The upper filter belt 2 and the lower filter belt 3 are tangent at each of the first support roller 5 and each of the second support roller 6.

[0038] The pusher 8 is connected to the extrusion roller 7. Since both ends of each extrusion roller 7 are movably mounted on the frame 1, the extrusion roller 7 can be extruded towards the second support roller 6 under the drive of the pusher 8, so that the extrusion roller 7 and the second support roller 6 clamp the tangent upper filter belt 2 and lower filter belt 3 to filter the silt between the upper filter belt 2 and the lower filter belt 3.

[0039] Compared to a typical belt filter press, the above-mentioned belt filter press adds a pusher 8 and a squeeze roller 7. The pusher 8 pushes the squeeze roller 7, so that the squeeze roller 7 and the second support roller 6 clamp the tangential upper filter belt 2 and lower filter belt 3. When filtering sludge, the sludge between the upper filter belt 2 and the lower filter belt 3 is squeezed by the squeeze roller 7, which allows more water to seep out, thereby reducing the water content of the sludge and reducing the adhesion of the sludge to the upper filter belt 2 and the lower filter belt 3. This makes the above-mentioned belt filter press have a higher efficiency in treating sludge.

[0040] To prevent the filtered water from flowing onto other components, the first support roller 5 is positioned above the second support roller 6, and the upper filter belt 2 and lower filter belt 3 between the first and second support rollers 5 and 6 are both vertical. Because the second support roller 6 is compressed by the pressure roller 7, while the first support roller 5 is not, the upper filter belt 2 and lower filter belt 3 on the second support roller 6 experience greater pressure, resulting in more water seeping from the sludge at the second support roller 6. Therefore, positioning the first support roller 5 above the second support roller 6 facilitates the downward dripping of water from the second support roller 6 instead of dripping onto it. The vertical orientation of the upper and lower filter belts 2 and 3 makes it easier for water to seep downwards, and when the upper and lower filter belts 2 and 3 wrapped around the second support roller 6 are compressed by the pressure roller 7, they also allow water to drip smoothly downwards, improving the efficiency of sludge filtration.

[0041] To facilitate more efficient water extraction from the vertically aligned upper filter belt 2 and lower filter belt 3, the pushing direction of the pusher 8 is set to horizontal. Horizontal pushing can involve pushing the lower semi-circular position of the second support roller 6, resulting in greater pressure from the squeeze roller 7 on the second support roller 6 and higher water extraction efficiency. At the same time, the extracted water is less likely to flow downwards along the pusher 8 and is less likely to be collected.

[0042] A more preferred embodiment of the aforementioned vertical upper filter belt 2 and lower filter belt 3, and the pushing member 8 with a horizontal pushing direction, is that the extrusion roller 7 presses against the outermost horizontal position of the second support roller 6. The outermost horizontal position of the second support roller 6 is the position where the vertical upper filter belt 2 and lower filter belt 3 are tangent to the second support roller 6. Furthermore, since the pushing direction of the pushing member 8 is perpendicular to the vertical upper filter belt 2 and lower filter belt 3, vertical extrusion makes it easier to squeeze out the water from the sludge.

[0043] Please refer to Figure 3To simplify the structure and better filter out the moisture from the sludge, this belt filter press is designed with at least two extrusion rollers 7. The pushing component 8 includes a first elastic element 81, with an extrusion roller 7 connected to each end of the first elastic element 81; the extension and retraction direction of the first elastic element 81 is perpendicular to the extrusion rollers 7; the first elastic element 81 drives the extrusion rollers 7 at both ends to press against the second support rollers 6 on both sides. By connecting the two extrusion rollers 7 to a single first elastic element 81, a good extrusion effect is achieved through a simple structure.

[0044] Please refer to Figure 3 To further improve the efficiency of filtering out water from sludge, the pusher 8 is designed to include a second elastic element 82. One end of the second elastic element 82 is connected to a squeeze roller 7, and the other end is fixed to the frame 1; the extension and retraction direction of the second elastic element 82 is perpendicular to the squeeze roller 7; the second elastic element 82 drives the squeeze roller 7 to press against the second support roller 6. One second elastic element 82 connected to one squeeze roller 7 can achieve a good squeezing effect. This structure is particularly suitable for applying pressure to the outermost second support roller 6.

[0045] To facilitate horizontal forward pushing, the axis of each second support roller 6 and the axis of each squeeze roller 7 are designed to be on the same horizontal line. Each squeeze roller 7 applies pressure from the same horizontal height toward the center of the second support roller 6, resulting in high pressure. Furthermore, since the upper filter belt 2 and lower filter belt 3 between the first support roller 5 and the second support roller 6 are both in the vertical direction, i.e., each squeeze roller 7 abuts against the left or right side of the second support roller 6, the squeezed water can flow smoothly vertically downwards, or flow along the lower semicircular arc of the second support roller 6 to the lowest point and detach from the upper filter belt 2 and lower filter belt 3. The squeezed water is less likely to flow to other positions on the upper filter belt 2 and lower filter belt 3, thus the belt filter press has a high dewatering efficiency.

[0046] Please refer to Figure 4 A preferred structure for achieving the alignment of the axis of each second support roller 6 and the axis of each extrusion roller 7 on the same horizontal line is as follows: Both sides of the frame 1 have horizontal slotted holes 101; both ends of each extrusion roller 7 are movably mounted within the slotted holes 101 on both sides. Each extrusion roller 7 can move horizontally along the slotted holes 101, thereby adapting to the pressure applied to extrude sludge between the upper filter belt 2 and the lower filter belt 3. The slotted holes 101 can be discontinuous, i.e., composed of several segments. The two ends of the extrusion roller are inserted into these slots, and springs can be located within the slots, allowing the extrusion roller to move horizontally within the slots. Two sliders can be fixed at both ends of the extrusion roller. These sliders are embedded in the slots and can slide horizontally along the slots, reducing wear on the extrusion roller and the frame, and allowing for equipment maintenance through the replacement of the sliders.

[0047] At the break point of the strip hole 101, i.e. at the frame body, both ends of the second support roller 6 are fixed at the break point of the strip hole 101. As mentioned above, this fixing does not allow positional movement, but allows rotation around the central axis of the second support roller 6 itself.

[0048] Please refer to Figure 1 To drive the upper filter belt 2 and lower filter belt 3 to rotate, the belt filter press may optionally include an upper driver 9 and a lower driver 10. Both the upper driver 9 and lower driver 10 are mounted on the frame 1. Both the upper driver 9 and lower driver 10 can be motors. The upper driver 9 is connected to a guide roller 4 that is wrapped around the upper filter belt 2. The lower driver 10 is connected to a guide roller 4 that is wrapped around the lower filter belt 3. The upper driver 9 drives the upper filter belt 2 to rotate, and the lower driver 10 drives the lower filter belt 3 to rotate. By controlling the rotational speeds of the upper driver 9 and the lower driver 10, the linear velocities of the upper filter belt 2 and the lower filter belt 3 can be made the same, achieving synchronous operation and effectively clamping the sludge for water extraction.

[0049] To collect the squeezed-out water, the belt filter press may optionally include a water tray 11. The water tray 11 is mounted below all the first support rollers 5 and all the second support rollers 6, with its edges located outside the surfaces of all the first support rollers 5 and all the second support rollers 6. Water squeezed from the surfaces of all the first support rollers 5 and all the second support rollers 6 flows into the water tray 11, which can be used to rinse other components and prevent water from flowing into the lower filter belt 3 and the ground below.

[0050] Please refer to Figure 2 As an optional embodiment, the belt filter press includes ten steering rollers 4, two first support rollers 5, three second support rollers 6, and five extrusion rollers 7. Please refer to [reference needed]. Figure 3 The belt filter press also includes two first elastic elements 81 and one second elastic element 82. Both the first elastic element 81 and the second elastic element 82 can be springs, which are preferably arranged horizontally. The diameter of the first support roller 5 is larger than the sum of the diameters of the two squeeze rollers 7, so as to facilitate the installation of the two squeeze rollers 7 and the first elastic element 81 between two adjacent second support rollers 6.

[0051] Each first elastic element 81 is connected to two extrusion rollers 7. The second elastic element 82 is connected to one extrusion roller 7 at the outer end.

[0052] The upper filter belt 2 is wrapped inward with four upper guide rollers 4, and the upper drive 9 is connected to a guide roller 4 located at the outlet 13. The upper drive 9 is fixed to the top of the frame 1. The upper drive 9 is linked to the guide roller 4 above the outlet 13 through the track, and can drive the guide roller 4 to rotate, thereby driving the rotation of the upper filter belt 2.

[0053] The lower filter belt 3 is wrapped inward with six lower guide rollers 4, and the lower drive 10 is connected to a guide roller 4 located at the outlet 13. The lower drive 10 is fixed to the lower part of the frame 1. The lower drive 10 is linked to the guide roller 4 below the outlet 13 through the track, and can drive the guide roller 4 to rotate, thereby driving the rotation of the upper filter belt 2.

[0054] Please refer to Figure 2 The upper filter belt 2 and the lower filter belt 3 are bonded together at two first support rollers 5 and three second support rollers 6. Here, the upper filter belt 2 and the lower filter belt 3 hold the sludge in between, and the sludge is squeezed and dewatered by the squeeze roller 7. The upper filter belt 2 and the lower filter belt 3 separate on both sides to form a sludge inlet 12 and a sludge outlet 13.

[0055] On the opposite side of the sludge outlet 13 is the sludge inlet 12, which receives the incoming sludge via a horizontal lower filter belt 3. The upper filter belt 2 at the sludge inlet 12 is positioned inward and inclined to avoid interfering with the sludge entering the inlet 12.

[0056] Both the upper filter belt 2 and the lower filter belt 3 at the sludge outlet 13 are inclined downwards to facilitate sludge discharge. Two scrapers 14 are also installed at the sludge outlet 13, with their blades in close contact with the upper filter belt 2 and the lower filter belt 3, respectively. A guide plate 15 is fixed below the lower scraper 14 to discharge the drier sludge after compression. Both ends of each scraper 14 are fixed to the frame 1. Both ends of the guide plate 15 are also fixed to the frame 1.

[0057] The belt filter press of this application adds a pusher 8 and a squeeze roller 7. The pusher 8 pushes the squeeze roller 7, so that the squeeze roller 7 and the second support roller 6 clamp the tangential upper filter belt 2 and lower filter belt 3. When filtering sludge, the sludge between the upper filter belt 2 and the lower filter belt 3 is squeezed by the squeeze roller 7, which allows more water to seep out, thereby reducing the water content of the sludge. Under the action of the scraper 14, the sludge is more easily separated from the upper filter belt 2 and the lower filter belt 3, so that the belt filter press of this application has a high efficiency in treating sludge. The water content of the sludge after being filtered by this belt filter press can reach below 50%, and it is not easy to stick to the filter belt of the belt filter press, which improves the efficiency of the belt filter press in treating sludge, makes transportation or bagging more convenient, and reduces transportation energy consumption.

[0058] The above are merely some embodiments of this application. The scope of protection of this application is not limited to the above embodiments. For those skilled in the art, any improvements and modifications made without departing from the inventive concept of this application also fall within the scope of protection of this application.

Claims

1. A belt filter, characterized in that The belt filter press comprises a frame (1), an upper filter belt (2), a lower filter belt (3), a plurality of turning rollers (4), a plurality of first supporting rollers (5), a plurality of second supporting rollers (6), a plurality of extruding rollers (7) and a pushing and extruding member (8). All the turning rollers (4), all the first supporting rollers (5), all the second supporting rollers (6) and all the extruding rollers (7) are parallel to each other; both ends of each of the turning rollers (4), both ends of each of the first supporting rollers (5) and both ends of each of the second supporting rollers (6) are fixed to the frame (1); both ends of each of the extruding rollers (7) are movably mounted to the frame (1). The upper filter belt (2) is arranged around the first supporting rollers (5), the second supporting rollers (6) and some of the turning rollers (4); the lower filter belt (3) is arranged around the first supporting rollers (5), the second supporting rollers (6) and some of the turning rollers (4); the upper filter belt (2) and the lower filter belt (3) are tangent to each other at each of the first supporting rollers (5) and each of the second supporting rollers (6). The pushing and extruding member (8) is connected to the extruding rollers (7), so that the extruding rollers (7) and the second supporting rollers (6) clamp the tangent upper filter belt (2) and lower filter belt (3). The first supporting rollers (5) are arranged above the second supporting rollers (6), and the upper filter belt (2) and the lower filter belt (3) between the first supporting rollers (5) and the second supporting rollers (6) are in a vertical direction. The pushing direction of the pushing and extruding member (8) is horizontal. The extruding rollers (7) abut against the outermost position of the second supporting rollers (6) in the horizontal direction. The axis of each of the second supporting rollers (6) and the axis of each of the extruding rollers (7) are located on the same horizontal line. Both sides of the frame (1) have horizontal strip-shaped holes (101); both ends of each of the extruding rollers (7) are movably mounted in the strip-shaped holes (101) on both sides. The belt filter press has at least two extruding rollers (7); the pushing and extruding member (8) comprises a first elastic member (81), both ends of the first elastic member (81) are connected to one of the extruding rollers (7); the extension direction of the first elastic member (81) is perpendicular to the extruding roller (7); the first elastic member (81) drives the extruding roller (7) at both ends to abut against the second supporting roller (6) on both sides, respectively. The pushing and extruding member (8) comprises a second elastic member (82), one end of the second elastic member (82) is connected to one of the extruding rollers (7), and the other end is fixed to the frame (1); the extension direction of the second elastic member (82) is perpendicular to the extruding roller (7); the second elastic member (82) drives the extruding roller (7) to abut against the second supporting roller (6).

2. The belt filter press of claim 1, wherein, The belt filter press further comprises an upper driver (9) and a lower driver (10); the upper driver (9) and the lower driver (10) are mounted to the frame (1); the upper driver (9) is connected to one of the turning rollers (4) wrapped by the upper filter belt (2); the lower driver (10) is connected to one of the turning rollers (4) wrapped by the lower filter belt (3).

3. The belt filter press of claim 1, wherein, The belt filter further comprises a water pan (11); the water pan (11) is installed below all the first supporting rollers (5) and all the second supporting rollers (6), and the edge of the water pan (11) is located outside all the first supporting rollers (5) and all the second supporting rollers (6).

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