Filter cloth winding and unwinding mechanism and multi-layer stacked solid-liquid separation system

Abstract

The invention relates to a multi-layer stacked solid-liquid separation system, in particular to a filter cloth winding and unwinding mechanism. The filter cloth winding and unwinding mechanism comprises a mounting frame, a plurality of fixed rollers, a floating roller and an adjusting assembly, the fixed rollers are fixedly mounted on the mounting frame, the floating roller can move up and down relative to the mounting frame, the adjusting assembly comprises an adjustable power mechanism and a floating seat, the adjustable power mechanism is fixedly mounted on the mounting frame, and the floating roller is fixedly mounted on the floating seat; and the adjustable power mechanism is connected with the floating seat and is used for driving the floating seat to move up and down, so that the position of the floating roller relative to the mounting frame can be continuously changed between a highest position and a lowest position. According to the invention, the position of the floating roller can be continuously adjusted within a range by arranging the adjustable power mechanism, so that the conveying angle of the filter cloth can be continuously adjusted within a range, different filter cloth recovery angles can be set for sludge with different water contents, sludge residues on the filter cloth are reduced, and the sludge recovery efficiency is improved.

Description

Technical Field

[0001] The invention relates to a multi-layer stacked solid-liquid separation system, in particular to a filter cloth retracting and releasing mechanism. Background Art

[0002] Patent document CN221094005U describes a high-pressure reciprocating automatic dewatering device for sludge (in patent document CN114917634A, such device is called a multi-layer stacked solid-liquid separation system, which is more appropriate, so other places in this application document refer to such device as a multi-layer stacked solid-liquid separation system). See paragraphs 0036 and 0037 of the specification of patent document CN221094005U. The multi-layer stacked solid-liquid separation system includes a high-pressure dewatering machine for dewatering sludge. The filter cloth retracting mechanism comprises a filter cloth retracting and releasing mechanism, a filter cloth retracting and releasing mechanism for retracting and releasing the filter cloth, and a sludge recovery mechanism for receiving dehydrated sludge. The high-pressure dehydration mechanism is arranged in front of the filter cloth retracting and releasing mechanism. The recovery trough of the sludge recovery mechanism is arranged below the roller of the filter cloth retracting and releasing mechanism. The movable roller of the filter cloth retracting and releasing mechanism moves to a high position when the filter cloth retracting and releasing mechanism retracts the filter cloth, thereby increasing the conveying angle of the filter cloth and improving the sludge recovery efficiency. The movable roller moves to a low position when the filter cloth retracting and releasing mechanism outputs the filter cloth and the sludge nozzle lays the sludge on the filter cloth, and does not contact the filter cloth.

[0003] Different sludges may have different moisture contents after dehydration, and the most suitable filter cloth recovery angles for sludges with different moisture contents are different, but the filter cloth recovery angle of the filter cloth retracting and releasing mechanism is fixed. When the sludge falls from the filter cloth to the sludge recovery mechanism, it is easy for the sludge to remain on the filter cloth. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new structure of a filter cloth retracting and releasing mechanism, so as to set different filter cloth recovery angles for different sludges based on the new structure, reduce the sludge residue on the filter cloth, and improve the sludge recovery efficiency.

[0005] In order to solve the above technical problems, the present invention provides a filter cloth retracting and releasing mechanism, including a mounting frame, a plurality of fixed rollers and a floating roller, wherein the fixed roller is rotatably mounted on the mounting frame and does not produce positional offset with the mounting frame, and the floating roller can move up and down relative to the mounting frame, and also includes an adjustment component, wherein the adjustment component includes an adjustable power mechanism and a floating seat, wherein one end of the adjustable power mechanism is fixedly mounted on the mounting frame, and the floating roller is rotatably mounted on the floating seat and does not produce positional offset with the floating seat, and the other end of the adjustable power mechanism is connected to the floating seat, and is used to drive the floating seat to move up and down relative to the mounting frame, so that the highest position and the lowest position of the floating roller can be adjusted. .

[0006] The present invention proposes to set an adjustable power mechanism to achieve the lowest and highest positions of the floating roller position that can be adjusted as needed, so that the filter cloth conveying angle can be continuously adjusted within a range, thereby setting different filter cloth recovery angles for sludge with different moisture contents, reducing sludge residue on the filter cloth, and improving sludge recovery efficiency.

[0007] In one embodiment, the adjustable power mechanism is a cylinder having a movable piston, a magnetic ring is installed on the piston, and a magnetic sensor is installed on the outer shell of the cylinder; the outer shell of the cylinder is fixedly connected to the mounting frame, and the piston of the cylinder is fixedly connected to the floating seat, and the floating seat moves up and down with the piston.

[0008] In one embodiment, the adjustment assembly further includes a guide shaft along the up-down direction, the guide shaft is fixedly mounted on the mounting frame, and the guide shaft passes through the floating seat to guide the up-down movement of the floating seat.

[0009] In one embodiment, the filter cloth retracting and releasing mechanism as described above also includes a scraper assembly, which includes a scraper plate and a rotating mechanism. The scraper plate is located at the rear and lower part of the floating roller. The scraper plate is rotatably connected to the floating seat so that the gap between the front of the scraper plate and the floating roller is variable. The rotating mechanism is used to control the rotation angle of the scraper plate relative to the floating seat.

[0010] The filter cloth passes through the gap between the scraper and the floating roller. When the floating roller moves to the highest position, the scraper can be rotated by the rotating mechanism to reduce the gap. When the gap is reduced, the dehydrated sludge on the filter cloth can be scraped off more thoroughly by the scraper (compared to without the scraper), and the sludge recovery efficiency is further improved.

[0011] In one embodiment, the rotation mechanism includes a tension spring, and the rear part of the scraper blade is connected to the mounting frame through the tension spring. When the floating roller moves to the highest position, the scraper blade rotates under the tension of the tension spring to reduce the gap between the front part of the scraper blade and the floating roller, and finally achieves abutment contact between the two. The rotation of the scraper blade is controlled by the tension spring, which is low in cost. In other embodiments of the present invention, the gap between the front part of the scraper blade and the floating roller can also be adjusted by other rotation mechanisms such as a cylinder, and the cylinder can be installed on the floating seat or on the mounting frame.

[0012] Furthermore, the rear part of the scraper blade is rotatably connected with a rotating member, and the scraper blade is connected to the tension spring through the rotating member, so that when the floating roller moves from the lowest position to the highest position, in the initial stage, the rotating member drives the tension spring to have an unloaded stroke. In this unloaded stroke, the rotating member avoids elastic deformation of the tension spring during the rotation process, and then avoids pulling the scraper blade to rotate synchronously. The provision of a rotating member can solve the problem that when the floating roller moves to the highest position and is in an unloaded stroke, the tension spring does not actually work, and avoids the scraper blade and the floating roller clamping the filter cloth too tightly, thereby hindering the conveying of the filter cloth.

[0013] In one embodiment, in the horizontal direction, the center of gravity of the scraper blade is located in front of the rotating shaft of the scraper blade relative to the floating seat. A limit piece is provided on the floating seat. The limit piece includes a main body. At least one strip hole is provided on the main body. A limit part extending along the thickness direction is provided on the top of the main body. By adjusting the upper and lower positions of the limit piece relative to the floating seat, the abutment contact between different positions of the limit part and the corresponding second shaft rod is achieved, thereby limiting the farthest upward position of the rear part of the scraper blade.

[0014] In one embodiment, the filter cloth retracting and releasing mechanism as described above also includes a winding assembly and a centering assembly, the winding assembly includes a winding roller and a driving mechanism, the driving mechanism is used to drive the winding roller to rotate so as to reel the filter cloth onto the winding roller, and the centering assembly is used to center the filter cloth relative to the winding roller in the direction of the rotating axis of the winding roller.

[0015] The present invention also provides a multi-layered solid-liquid separation system, comprising a high-pressure dewatering mechanism for dewatering sludge, a filter cloth retracting and releasing mechanism for retracting and releasing filter cloth, and a sludge recovery mechanism for receiving dewatered sludge, the high-pressure dewatering mechanism is located in front of the filter cloth retracting and releasing mechanism, the sludge recovery mechanism comprises a recovery trough, the filter cloth retracting and releasing mechanism is the filter cloth retracting and releasing mechanism described above, the recovery trough is located below the floating roller, and the floating roller is closer to the high-pressure dewatering mechanism in the horizontal direction than the fixed roller.

[0016] Compared with the multi-layer stacked solid-liquid separation system recorded in patent document CN221094005U, the multi-layer stacked solid-liquid separation system provided by the present invention has made improvements to the filter cloth retracting and releasing mechanism, so that the filter cloth conveying angle can be continuously adjusted within a range, thereby achieving a higher sludge recovery efficiency for dehydrated sludge with different moisture contents.

[0017] In one embodiment, when the floating roller moves to the lowest position, the filter cloth conveying angle is 0°.

[0018] When the upper body of the material spreading trolley of the multi-layer stacked solid-liquid separation system spreads mud on the filter cloth, there is a section of filter cloth on the upper and lower parts of the upper body, namely the upper filter cloth and the lower filter cloth. The upper body spreads the sludge on the lower filter cloth. When spreading the mud, the conveying angle of the filter cloth is 0°, that is, the upper filter cloth is horizontal, which helps to prevent wrinkles when the upper filter cloth covers the lower filter cloth covered with sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 and 2 The three-dimensional views of the filter cloth retracting and releasing mechanism of the first embodiment of the present invention from different viewing angles; Figure 3 and 4 They are shown respectively Figure 1 The filter cloth retracting and releasing mechanism is shown in the state of spreading and scraping mud; Figure 5 Shows Figure 1 The scraper assembly is shown in the state when the floating roller is in the lowest position; Figure 6 and 7 Shows Figure 5 The state change of the scraper assembly during the movement of the floating roller from the lowest position to the highest position is shown; Figure 8 for Figure 5 A three-dimensional view of the stopper shown; Fig. 9 for Figure 5 A perspective view of the scraper blade shown; Figure 10-1 to Figure 10-2 The diagram shown is a schematic diagram showing different gaps between the scraper blade and the floating roller by adjusting the relative up-and-down position relationship between the limiter and the floating seat. DETAILED DESCRIPTION Embodiment 1

[0020] See also Figure 1 and 2 The present embodiment provides a filter cloth retracting and releasing mechanism, which is used to retract and release the filter cloth in a multi-layer stacked solid-liquid separation system. The filter cloth retracting and releasing mechanism includes a mounting frame 1, a plurality of fixed rollers 2, a floating roller 3, an adjustment component 6, a mud scraping component, a winding component 7 and a centering component 8. The mud scraping component includes a mud scraping plate 4 and a pair of tension springs 5. The adjustment component 6 includes a pair of adjustable power mechanisms 61, a pair of floating seats 62 and a pair of guide shafts 63. The winding component 7 includes a winding roller and a driving mechanism. The driving mechanism is used to drive the winding roller to rotate so as to reel the filter cloth onto the winding roller. The centering component 8 is used to center the filter cloth relative to the winding roller in the direction of the rotating shaft of the winding roller. The structure and installation position of the winding component 7 and the centering component 8 can refer to the attached drawings, and can also be designed with reference to the prior art. The fixed roller 2 and the floating roller 3 have similar structures, both of which include a roller shaft, bearing seats at both ends of the roller shaft, etc., and can refer to the attached drawings, and can also be designed with reference to the prior art. The two bearing seats of the fixed roller 2 are fixed on the mounting frame 1 , and the two bearing seats of the floating roller 3 are fixed on the two floating seats 62 respectively.

[0021] The adjustable power mechanism 61 is a cylinder having a movable piston rod, a magnetic ring is installed on the piston rod, and a magnetic sensor is installed on the outer shell of the cylinder. Based on the induction of the magnetic sensor to the magnetic ring, the position of the piston rod is accurately controlled. The change of the piston rod position leads to the change of the position of the floating roller 3, and the change of the position of the floating roller 3 leads to the change of the filter cloth conveying angle α. The cylinder with a magnetic ring and a magnetic sensor and its control principle are all prior arts. Those skilled in the art only need to determine the corresponding piston rod position according to the filter cloth conveying angle α suitable for different sludge.

[0022] The outer shell of the cylinder is fixedly connected to the mounting frame 1, the piston rod of the cylinder is fixedly connected to the floating seat 62, the floating seat 62 moves up and down with the piston rod, and the guide shaft 63 fixed on the mounting frame 1 passes through the floating seat 62 to guide the up and down movement of the floating seat 62. In other embodiments of the present invention, the adjustable power mechanism can also be other mechanisms that can accurately lift the floating seat to a required distance, such as a motor, and the connection method between the adjustable power mechanism and the floating seat is adjusted accordingly according to the driving method of the adjustable power mechanism, and the guide shaft can be cancelled or replaced with other guide structures (such as slide rails) as needed.

[0023] The floating roller 3 moves up and down with the floating seat 62, and the filter cloth T is always in contact with the floating roller 3. The filter cloth conveying angle α changes continuously with the movement of the floating roller 3. Figure 3 When the floating roller 3 moves to the lowest position, the filter cloth conveying angle α is 0°, which is suitable for spreading mud on the filter cloth T. When spreading mud, the conveying direction of the filter cloth T refers to Figure 3 The arrow marked on the filter cloth T in the figure indicates that the filter cloth retracting and releasing mechanism outputs the filter cloth T to the high-pressure dehydration mechanism. When spreading mud, the upper body of the material spreading trolley of the multi-layer solid-liquid separation system moves forward (the material spreading trolley is equivalent to the automatic feeding mechanism disclosed in CN221094005U), and pushes the filter cloth T forward, so that the filter cloth T is wrapped in a U-shape on the upper body. The filter cloth located above the upper body is called the upper filter cloth, and the filter cloth located below the upper body is called the lower filter cloth. After the upper body spreads the sludge on the upper surface of the lower filter cloth and moves backward from between the upper filter cloth and the lower filter cloth, the upper filter cloth naturally covers the lower filter cloth on which the sludge is spread. Since the filter cloth conveying angle α is 0°, that is, the upper filter cloth is in a horizontal state, when the upper filter cloth covers the lower filter cloth on which the sludge is spread, the upper filter cloth is not easy to wrinkle.

[0024] Floating roller 3 moves to the highest position (see Figure 4 ), or between the lowest and highest positions, the filter cloth conveying angle α is an acute angle, which is suitable for scraping the filter cloth T at the discharge. When scraping the filter cloth T at the discharge, refer to Figure 4 The arrow marked on the filter cloth T indicates that the filter cloth retracting mechanism retracts the filter cloth T from the high-pressure dehydration mechanism; by adjusting the position of the floating roller 3, the filter cloth conveying angle α is changed to be suitable for the discharge and scraping of sludge with different moisture contents.

[0025] In order to further improve the scraping effect and reduce the sludge residue on the filter cloth T, a scraper blade 4 is arranged parallel to the floating roller 3 to assist in scraping. The scraper blade 4 is mounted on the floating seat 62 and is rotatably connected to the two floating seats 62. When the scraper blade 4 is rotated, the gap between the front part of the scraper blade 4 on the side of the floating roller 3 and the floating roller 3 will change.

[0026] The scraper blade 4 is connected to the mounting frame 1 through a pair of tension springs 5. The upper ends of the two tension springs 5 ​​are respectively hung on the rotating members 41 on both sides of the rear of the scraper blade 4, and the lower ends of the tension springs 5 ​​are hung on the mounting frame 1. The rotating member 41 is an "L"-shaped structure, which is rotatably connected to the scraper blade 4. The position where the rotating member 41 is connected to the tension spring 5 deviates from the rotating shaft of the rotating member 41. The filter cloth T passes through the gap between the scraper blade 4 and the floating roller 3. When the floating roller 3 is at the lowest position, the gap between the scraper blade 4 and the floating roller 3 is the largest. When the floating roller 3 moves from the lowest position to the highest position, under the tension of the tension spring 5, the rotating member 41 is first caused to rotate from the first position to the second position (see Figure 6 ), which in turn causes the scraper blade 4 to rotate (see Figure 7 ), so that the gap between the scraper blade 4 and the floating roller 3 becomes smaller, until the scraper blade 4 and the floating roller 3 are in contact with each other, thereby improving the scraping effect.

[0027] The purpose of setting the rotating member 41 is to ensure that there is an unloaded stroke in the initial stage of the floating roller 3 moving from the lowest position to the highest position, and the tension spring 5 will not pull the rear part of the scraper plate 4 to move downward. At this time, there is at least a section of the plane where the filter cloth T is not laid with sludge during the recovery process. The unloaded stroke can avoid the contact between the scraper plate 4 and the filter cloth T, thereby causing damage to the filter cloth T. When the unloaded stroke ends and the tension spring 5 is in a tensioned state, the scraper plate 4 and the floating roller 3 clamp the filter cloth T tighter and tighter. At this time, the filter cloth T just moves to the part where the sludge is laid, and the scraper plate 4 is used to scrape the sludge attached to the filter cloth T to the silo below (not shown).

[0028] See also Fig. 9 , the scraper blade 4 includes a "U"-shaped frame 401, two first shafts 402 and a scraper 403, the "U"-shaped frame 401 includes two longitudinal parts 4011 and a transverse part 4012 fixed between the front parts of the two longitudinal parts, the scraper 403 is made of wear-resistant non-metallic material, and this embodiment is made of nylon material, which is detachably fixed on the transverse part 4012 of the "U"-shaped frame 401 and extends toward one side of the floating roller 3, the two first shafts 402 are respectively fixed at the middle position of the two longitudinal parts 4011 of the "U"-shaped frame 401, and the scraper blade 4 is rotatably connected to the floating seat 62 through the first shaft 402; the rotating member 41 is an "L"-shaped structure, including a swing arm 411 and a second shaft 412 fixedly connected to each other, and the second shaft 412 is rotatably connected to the rear part of the longitudinal part 4011 of the "U"-shaped frame 401, and one end of the tension spring 5 is connected to the mounting frame 1, and the other end is connected to the free end of the swing arm 411 (see Figure 5 ).

[0029] Figure 5 , Figure 8 Combination Figure 10-1 and Figure 10-2In the horizontal direction, the center of gravity of the scraper blade 4 is located in front of the rotating shaft of the scraper blade 4 relative to the floating seat 62. The floating seat 62 is provided with a limiter 42. The limiter 42 disclosed in this embodiment is an "L"-shaped structure, which includes a vertical body 421, and two strip holes 4211 are provided on the vertical body 421 along the height direction. A horizontal portion 422 is provided on the top of the vertical body 421. The horizontal portion 422 can be used as a specific embodiment of the limiter 422 defined in the claims. Of course, the limiter can also be A slope is provided on the vertical body 421, and the adjustment margin of the upper and lower positions of the limit member 42 relative to the floating seat 62 is realized through the strip hole 4211. Then the locking member 423 is passed through the strip hole 4211 and locked to the floating seat 62. By adjusting the upper and lower positions of the limit member 42, the abutment contact between different positions of the horizontal portion 422 and the corresponding second shaft rod 412 is achieved, thereby limiting the farthest position of the rear part of the scraper blade 4, that is, the initial value of the gap between the scraper blade 4 and the floating roller 3 is adjustable. Embodiment 2

[0030] The present embodiment provides a multi-layer stacked solid-liquid separation system, which includes a PLC controller, a material spreading trolley for spreading mud, a high-pressure dehydration mechanism for dehydrating sludge, a sludge recovery mechanism for receiving dehydrated sludge, and a filter cloth retracting mechanism provided in the first embodiment, etc. The sludge recovery mechanism includes a recovery trough, which is located below the floating roller 3, and the high-pressure dehydration mechanism is located in front of the filter cloth retracting mechanism, that is, in front of the floating roller 3. The floating roller 3 is closer to the high-pressure dehydration mechanism than the fixed roller 2 in the horizontal direction, that is, the floating roller 3 is closer to the fixed roller 2. The difference in structure between the multi-layer stacked solid-liquid separation system and the multi-layer stacked solid-liquid separation system recorded in the patent document CN221094005U is that the structure of the filter cloth retracting mechanism is improved, and a control circuit is added between the PLC controller and the adjustable power mechanism to realize the control of the adjustable power mechanism by the PLC controller.

[0031] By referring to the prior art, those skilled in the art can easily achieve: adding a control circuit between the PLC controller and the adjustable power mechanism, changing the control program in the PLC controller, so that the PLC controller controls the adjustable power mechanism to adjust the floating roller 3 to the lowest position before outputting the filter cloth, and before recovering the filter cloth, controlling the adjustable power mechanism to adjust the floating roller 3 to the corresponding position according to the filter cloth recovery angle suitable for different sludge.

Claims

1. A filter cloth retracting and releasing mechanism, which is used in a multi-layer stacked solid-liquid separation system, comprising a mounting frame (1), a plurality of fixed rollers (2) and a floating roller (3), wherein the fixed roller (2) is rotatably mounted on the mounting frame (1) and does not cause positional deviation with respect to the mounting frame (1), and the floating roller (3) is movable up and down relative to the mounting frame (1), characterized in that: The invention also comprises an adjustment component (6), the adjustment component (6) comprising an adjustable power mechanism (61) and a floating seat (62), one end of the adjustable power mechanism (61) being fixedly mounted on the mounting frame (1), the floating roller (3) being rotatably mounted on the floating seat (62) and not causing positional deviation with the floating seat (62), the other end of the adjustable power mechanism (61) being connected to the floating seat (62) and being used for driving the floating seat (62) to move up and down relative to the mounting frame (1), so that the highest position and the lowest position of the floating roller (3) are adjustable.

2. The filter cloth retracting and releasing mechanism according to claim 1, characterized in that: The adjustable power mechanism (61) is a cylinder having a movable piston rod (611), a magnetic ring being mounted on the piston rod (611), and a magnetic sensor being mounted on the outer shell of the cylinder; the outer shell of the cylinder is fixedly connected to the mounting frame (1), the piston rod (611) of the cylinder is fixedly connected to the floating seat (62), and the floating seat (62) moves up and down along with the piston rod (611).

3. The filter cloth retracting and releasing mechanism according to claim 2, characterized in that: The adjustment assembly (6) further comprises a guide shaft (63) extending in the up-down direction. The guide shaft (63) is fixedly mounted on the mounting frame (1). The guide shaft (63) passes through the floating seat (62) and has a guiding effect on the up-down movement of the floating seat (62).

4. The filter cloth retracting and releasing mechanism according to any one of claims 1 to 3, characterized in that: The filter cloth retracting and releasing mechanism further comprises a scraper assembly, which comprises a scraper plate (4) and a rotating mechanism. The scraper plate (4) is located at the rear lower part of the floating roller (3). The scraper plate (4) is rotatably connected to the floating seat (62) so that the gap between the front part of the scraper plate (4) and the floating roller (3) is variable. The rotating mechanism is used to control the rotation angle of the scraper plate (4) relative to the floating seat (62).

5. The filter cloth retracting and releasing mechanism according to claim 4, characterized in that: The rotating mechanism comprises a tension spring (5), and the rear part of the scraper blade (4) is connected to the mounting frame (1) via the tension spring (5). When the floating roller (3) moves to the highest position, the scraper blade (4) rotates under the tension of the tension spring (5), so that the gap between the front part of the scraper blade (4) and the floating roller (3) becomes smaller, and finally the two are brought into abutting contact.

6. The filter cloth retracting and releasing mechanism according to claim 5, characterized in that: The rear portion of the scraper blade (4) is rotatably connected to a rotating member (41), and the scraper blade (4) is connected to the tension spring (5) via the rotating member (41). When the floating roller (3) moves from the lowest position to the highest position, in the initial stage, the rotating member (41) drives the tension spring (5) to have an idle stroke. Within the idle stroke, the rotating member (41) prevents the tension spring (5) from generating elastic deformation during the rotation process, thereby preventing the scraper blade (4) from being pulled to rotate synchronously.

7. The filter cloth retracting and releasing mechanism according to claim 6, characterized in that: The scraper blade (4) comprises a U-shaped frame (401), two first shafts (402) and a scraper blade (403). The U-shaped frame (401) comprises two longitudinal portions (4011) and a transverse portion (4012) fixed between the front portions of the two longitudinal portions. The scraper blade (403) is made of a wear-resistant non-metallic material and is detachably fixed to the transverse portion (4012) of the U-shaped frame (401) and extends toward one side of the floating roller (3). The two first shafts (402) are respectively fixed to the transverse portion (4012) of the U-shaped frame (401). The scraper blade (4) is rotatably connected to the floating seat (62) via a first shaft (402) at a middle position between the two longitudinal parts (4011) of the "U"-shaped frame (401); the rotating member (41) is an "L"-shaped structure, comprising a swing arm (411) and a second shaft (412) fixedly connected to each other; the second shaft (412) is rotatably connected to the rear part of the longitudinal part (4011) of the "U"-shaped frame (401); one end of the tension spring (5) is connected to the mounting frame (1), and the other end is connected to the free end of the swing arm (411).

8. The filter cloth retracting and releasing mechanism according to claim 7, characterized in that: In the horizontal direction, the center of gravity of the scraper blade (4) is located in front of the rotating shaft of the scraper blade (4) relative to the floating seat (62). A limiting member (42) is provided on the floating seat (62). The limiting member (42) comprises a main body (421). At least one strip hole (4211) is provided on the main body (421). A limiting portion (422) extending along the thickness direction of the main body is provided on the top of the main body. By adjusting the upper and lower positions of the limiting member (42) relative to the floating seat (62), the limiting portion (422) at different positions can be brought into contact with the corresponding second shaft rod (412), thereby limiting the farthest position of the rear portion of the scraper blade (4) moving upward.

9. The filter cloth retracting and releasing mechanism according to any one of claims 1 to 3, characterized in that: The filter cloth retracting and unwinding mechanism further comprises a reeling assembly (7) and a centering assembly (8); the reeling assembly (7) comprises a reeling roller and a driving mechanism; the driving mechanism is used to drive the reeling roller to rotate so as to reel the filter cloth onto the reeling roller; the centering assembly (8) is used to center the filter cloth relative to the reeling roller in the direction of the rotating shaft of the reeling roller.

10. A multi-layer stacked solid-liquid separation system, comprising a high-pressure dehydration mechanism for dehydrating sludge, a filter cloth receiving and releasing mechanism for receiving and releasing filter cloth, and a sludge recovery mechanism for receiving dehydrated sludge, wherein the high-pressure dehydration mechanism is located in front of the filter cloth receiving and releasing mechanism, and the sludge recovery mechanism comprises a recovery trough, characterized in that: The filter cloth retracting and releasing mechanism is the filter cloth retracting and releasing mechanism as claimed in any one of claims 1 to 9, the recovery trough is located below the floating roller (3), and the floating roller (3) is closer to the high-pressure dehydration mechanism in the horizontal direction than the fixed roller (2).

11. The multi-layer stacked solid-liquid separation system according to claim 10, characterized in that: When the floating roller (3) moves to the lowest position, the filter cloth conveying angle (α) is 0°.

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