High-pressure dehydration mechanism and multi-layer stacked solid-liquid separation system

Abstract

The invention relates to sludge dewatering equipment, in particular to a high-pressure dewatering mechanism and a multi-layer stacked solid-liquid separation system. The lower surface of the upper pressing plate is designed to protrude downwards, and the protruding amount is gradually reduced from the center to the edge, so that when the upper pressing plate downwards presses the filter cloth and the sludge stacked on the lower top plate, the sludge is extruded from the center to the edge, the extruded water is discharged from the center to the edge, and the dewatering effect is improved.

Description

Technical Field

[0001] The invention relates to a sludge dewatering device, in particular to a high-pressure dewatering mechanism and a multi-layer stacked solid-liquid separation system. Background Art

[0002] Patent document CN221094005U records a sludge high-pressure reciprocating automatic dewatering equipment (in patent document CN114917634A, this type of equipment is called a multi-layer stacked solid-liquid separation system, which is more appropriate, so this type of equipment is called a multi-layer stacked solid-liquid separation system in other places of this application document), see paragraphs 0030 to 0032 of the specification of patent document CN221094005U, the stacked sludge is squeezed and dehydrated between the extended top plate of the high-pressure hydraulic cylinder and the extended top plate of the discharge hydraulic cylinder, and the squeezed sewage flows out from the water filter hole of the pressure-resistant inner cylinder to between the pressure-resistant inner cylinder and the water collecting outer barrel body, and a water outlet hole is provided at the bottom of the water collecting outer barrel body, and the sewage is discharged from the high-pressure dewatering mechanism from the water outlet hole.

[0003] In order to prevent the sludge from being squeezed out, the edge of the stacked filter cloth exceeds the edge of the pressure-resistant inner cylinder, so that the stacked filter cloth is low in the center and high at the edges in the pressure-resistant inner cylinder. When the extended top plate of the high-pressure hydraulic cylinder squeezes and dehydrates the stacked sludge, the dehydration effect of the sludge in the center is prone to poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to improve the dehydration effect of the high-pressure dehydration mechanism.

[0005] In order to solve the above technical problems, the present invention proposes to design the lower surface of the upper pressure plate to be convex downward, and the amount of convexity gradually decreases from the center to the edge, so that when the upper pressure plate presses downward on the stacked filter cloth and sludge on the lower top plate, the sludge is squeezed from the center to the edge, and the squeezed water is discharged from the center to the edge, thereby improving the dehydration effect.

[0006] The present invention provides a high-pressure dehydration mechanism, which is used in a multi-layer stacked solid-liquid separation system. The high-pressure dehydration mechanism comprises a frame, a bottom plate, a barrel, an upper pressing plate, an upper driving mechanism, a lower top plate and a lower driving mechanism; the upper driving mechanism and the bottom plate are respectively fixed on the frame; the barrel comprises an outer barrel provided with a drainage port and an inner barrel provided with a drainage hole; the lower top plate is used to carry the filter cloth and sludge stacked in the barrel; the lower driving mechanism is fixed on the bottom plate, and the driving end passes through the bottom plate and is used to drive the lower top plate to move up and down; the upper pressing plate is located above the lower top plate, and the driving end of the upper driving mechanism is connected to the upper pressing plate, which is used to drive the upper pressing plate to press the filter cloth and sludge stacked on the lower top plate to dehydrate the sludge, and the squeezed water is discharged from the drainage hole into between the outer barrel and the inner barrel, and then discharged from the barrel from the drainage port, and the lower surface of the upper pressing plate bulges downward, and the bulge amount gradually decreases from the center to the edge.

[0007] The upper pressing plate can be a rectangular structure / square structure / circular structure, etc. The structure of the lower top plate and the barrel matches the upper pressing plate. The convexity of the lower surface of the upper pressing plate should not be too large or too small. If it is too large, it will affect the dehydration effect of the edge sludge. If it is too small, it will affect the dehydration effect of the central sludge. The convexity should be designed with reference to the short side length / side length / diameter of the upper pressing plate. For example, the convexity of the lower surface of the upper pressing plate gradually decreases from the center point to the edge, and the ratio of the convexity of the center point to the short side length / side length / diameter of the upper pressing plate is between 1% and 5%.

[0008] Preferably, in order to prevent the pressure from being transmitted to the lower driving mechanism when the upper pressure plate is pressing mud, a plurality of guide holes are provided at the driving end of the lower driving mechanism, and guide bolts are passed through the guide holes from bottom to top, and the guide bolts are threadedly connected to the lower top plate. When the lower top plate is supported by the bottom plate, there is a gap between the driving end of the lower driving mechanism and the lower top plate, and the gap provides a space for the lower top plate to deform, thereby blocking the pressure from being transmitted to the lower driving mechanism when the upper pressure plate is pressing mud. Preferably, in order to prevent the guide bolts from being subjected to radial force when the lower driving mechanism supports the lower top plate, a limiting groove is provided on the lower side of the lower top plate corresponding to the driving end of the lower driving mechanism, and when the driving end of the lower driving mechanism supports the lower top plate, the driving end of the lower driving mechanism is embedded in the limiting groove.

[0009] Preferably, to prevent the edge of the drain hole from scratching the filter cloth, the drain hole is a strip structure extending from the upper end to the lower end of the inner cylinder, and multiple drain holes are evenly arranged side by side on the inner cylinder. Unpreferably, the drain hole is a circular structure, and multiple drain holes are evenly arranged on the inner cylinder.

[0010] Preferably, in order to facilitate the maintenance of the barrel, the barrel is placed on the bottom plate and connected to the bottom plate in a detachable manner, so that the barrel can be removed for maintenance when necessary. A sealing ring or a rubber seal is provided between the lower side of the barrel and the bottom plate to prevent water in the inner barrel from leaking out from between the barrel and the bottom plate. Unpreferably, the barrel is connected to the bottom plate in a non-detachable manner.

[0011] Preferably, in order to prevent water in the inner cylinder from seeping from between the lower top plate and the bottom plate to the lower driving mechanism, a first boss is provided on the upper side of the bottom plate corresponding to the lower top plate, and the gap between the edge of the lower top plate and the inner cylinder is smaller than the gap between the edge of the first boss and the inner cylinder; when the lower top plate is supported by the bottom plate, the lower top plate is placed on the first boss, and a circle of water storage space is formed around the first boss under the lower top plate.

[0012] Preferably, in order to prevent water in the inner cylinder from seeping into the lower driving mechanism from between the lower top plate and the bottom plate, a circle of second bosses is provided on the upper side of the bottom plate around the connection between the lower driving mechanism and the lower top plate, and a circle of clearance grooves is provided on the lower side of the lower top plate corresponding to the circle of second bosses. When the lower top plate is supported by the bottom plate, the second bosses are inserted into the clearance grooves to prevent water in the inner cylinder from seeping into the lower driving mechanism.

[0013] When the barrel is connected to the bottom plate in a detachable manner, preferably, in order to facilitate the installation of the barrel, the bottom plate includes an inner support plate for supporting the lower top plate and an outer support plate for supporting the barrel, and the outer support plate surrounds the inner support plate; the edge of the inner support plate has a positioning function for the installation of the barrel, and the lower end of the inner wall of the barrel is provided with a circle of chamfers for guiding the installation of the barrel. In order to reduce the difficulty of manufacturing, the outer support plate and the inner support plate are welded to achieve sealing between the outer support plate and the inner support plate; unpreferably, the outer support plate and the inner support plate are formed by milling a plate.

[0014] Preferably, in order to facilitate the cleaning of the barrel, a plurality of cleaning ports are provided on the outer barrel, and an openable sealing cover is provided on the cleaning port. In order to facilitate the cleaning of the sludge between the inner barrel and the outer barrel from the cleaning port, the cleaning port should not be too small. In order to facilitate the observation of whether there is sludge between the inner barrel and the outer barrel, the sealing cover can be designed to be light-transmissive.

[0015] Preferably, to prevent the barrel from tilting, the lower end of the barrel is fixed to the bottom plate, and the upper end of the barrel is fixed to the frame.

[0016] Preferably, the upper end of the inner wall of the barrel is provided with a circle of chamfers for guiding the filter cloth to enter the barrel.

[0017] The present invention provides a multi-layer stacked solid-liquid separation system, comprising a filter cloth retracting and releasing mechanism for retracting and releasing filter cloth, a spreading trolley for spreading mud on the filter cloth, a cloth pressing mechanism for pressing the filter cloth during the spreading stage, and a high-pressure dehydration mechanism provided by the present invention.

[0018] The cloth pressing mechanism includes a pressing block / pressing rod and a power mechanism for driving the pressing block / pressing rod to move. The high-pressure dehydration mechanism is located in front of the filter cloth retracting and releasing mechanism. The pressing block / pressing rod is divided into a front pressing block / pressing rod located in front of the upper pressing plate and a rear pressing block / pressing rod located behind the upper pressing plate. Preferably, a sunken table is provided on the upper side of the barrel for making way for the rear pressing block / pressing rod, so as to facilitate the upper body of the material laying trolley to pass over the rear pressing block / pressing rod.

[0019] Preferably, in order to increase the space between the inner cylinder and the outer cylinder, the front wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the front wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the front wall of the outer cylinder and the inner cylinder; the rear wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the rear wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the rear wall of the outer cylinder and the inner cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 and 2 They are three-dimensional views of the high-pressure dehydration mechanism of the first embodiment of the present invention from different viewing angles; Figure 3 for Figure 1 A cross-sectional view of the high pressure dehydration mechanism shown; Figure 4for Figure 1 A cross-sectional view of the upper pressing plate shown; Figure 5 Shows Figure 3 The assembly relationship of the lower top plate shown; Figure 6 for Figure 1 A perspective view of the barrel and drain pipe shown; Figure 7 for Figure 6 A three-dimensional view of the inner tube and the transverse and longitudinal reinforcing ribs shown; Figure 8 for Figure 1 A three-dimensional view of the high-pressure dehydration mechanism after removing the barrel and the drain pipe; Fig. 9 and 10 for Figure 8 The high-pressure dehydration mechanism shown is a stereoscopic view from different angles after the lower top plate and the lower driving mechanism are removed; Fig.11 Shows Figure 8 Drainage direction around the lower top plate shown. DETAILED DESCRIPTION Embodiment 1

[0021] See also Figures 1 to 3 A high-pressure dehydration mechanism comprises a frame 1, a bottom plate 2, a barrel 3, an upper pressing plate 4, an upper driving mechanism 41, a lower top plate 5 and a lower driving mechanism 51. The upper driving mechanism 41 and the bottom plate 2 are respectively fixed on the frame 1. The lower top plate 5 is used to carry the filter cloth and sludge stacked in the barrel 3. The lower driving mechanism 51 is fixed on the bottom plate 2. The driving end passes through the bottom plate 2 and is used to drive the lower top plate 5 to move up and down. Figure 3 and 10 The bottom plate 2 is provided with a clearance hole for the driving end of the lower driving mechanism 51 to pass through. A connecting piece 20 is welded and fixed to the lower side of the bottom plate 2. The lower driving mechanism 51 passes through the connecting piece 20 and is fixed to the connecting piece 20 by bolts. The upper pressing plate 4 is located above the lower top plate 5. The driving end of the upper driving mechanism 41 is connected to the upper pressing plate 4 to drive the upper pressing plate 4 to press the filter cloth and sludge stacked on the lower top plate 5 to dehydrate the sludge.

[0022] See also Figure 1 and 2 In order to make the upper pressing plate 4 move stably, an upper guide shaft 42 is also installed on the upper pressing plate 4, and a guide shaft sleeve is provided on the frame 1 corresponding to the upper guide shaft 42; see Figure 5 and 10 In order to enable the lower top plate 5 to move stably, a lower guide shaft 55 is also installed on the lower top plate 5, and a guide shaft sleeve is provided on the bottom plate 2 corresponding to the lower guide shaft 55.

[0023] See also Figure 3 and 4, the lower surface of the upper pressing plate 4 is convex downward, and the convex amount gradually decreases from the center to the edge. The upper pressing plate 4 is a square structure, and the lower top plate 5 and the barrel 3 match the upper pressing plate 4 and are also square structures. The convex amount of the lower surface of the upper pressing plate 4 gradually decreases from the center point to the edge, and the ratio of the convex amount A at the center point to the side length B of the upper pressing plate 4 is between 1% and 5%.

[0024] See also Figure 3 and 5 The driving end of the lower driving mechanism 51 is provided with a plurality of guide holes, and guide bolts 52 are passed through the guide holes from bottom to top. The guide bolts 52 are threadedly connected to the lower top plate 5. When the lower top plate 5 is supported by the bottom plate 2, there is a gap G between the driving end of the lower driving mechanism 51 and the lower top plate 5. The gap G provides a deformation space for the lower top plate 5, thereby blocking the pressure from being transmitted to the lower driving mechanism 51 when the upper pressing plate 4 presses the mud.

[0025] In order to prevent the guide bolt 52 from being subjected to radial force when the lower driving mechanism 51 supports the lower top plate 5, a limiting groove 53 is provided on the lower side of the lower top plate 5 corresponding to the driving end of the lower driving mechanism 51. When the lower top plate 5 is supported by the driving end of the lower driving mechanism 51, the driving end of the lower driving mechanism 51 is embedded in the limiting groove 53.

[0026] Before spreading the mud, the driving end of the lower driving mechanism 51 is embedded in the limiting groove 53 to lift up the lower top plate 5; after each layer of mud is spread, the driving end of the lower driving mechanism 51 moves downward a little, and the lower top plate 5 moves downward with the driving end of the lower driving mechanism 51 under its own weight and the pressure of the filter cloth and sludge until the lower top plate 5 is blocked by the bottom plate 2; thereafter, the driving end of the lower driving mechanism 51 continues to move downward and separates from the lower top plate 5 until a gap G is left between the driving end of the lower driving mechanism 51 and the lower top plate 5; thereafter, the upper pressing plate 4 moves downward under the drive of the upper driving mechanism 41, exerts pressure on the filter cloth and sludge stacked on the lower top plate 5, squeezes out the water in the sludge, and under the pressure of the upper pressing plate 4 and the pressure of the filter cloth and sludge, the lower top plate 5 is deformed, and the gap G leaves space for the deformation to prevent the lower top plate 5 from being pressed on the driving end of the lower driving mechanism 51.

[0027] See also Figure 6 and 7The barrel 3 includes an outer barrel 31 provided with a drain port (connected to a drain pipe 100) and an inner barrel 32 provided with a drain hole 321. The drain hole 321 is a strip structure extending from the upper end to the lower end of the inner barrel 32 to avoid scratching the filter cloth. A plurality of longitudinal drain holes 321 are evenly arranged side by side on the inner barrel 32. In order to ensure the pressure resistance of the inner barrel 32, a plurality of transverse reinforcing ribs 33 and longitudinal reinforcing ribs 34 are arranged on the outer side of the inner barrel 32. A water outlet gap is left between the transverse reinforcing ribs 33 and the longitudinal reinforcing ribs 34 and the outer barrel 31. The water squeezed out of the sludge is discharged from the drain hole 321 into the space between the outer barrel 31 and the inner barrel 32, and then discharged from the barrel 3 from the drain port. To facilitate cleaning of the sludge between the inner cylinder 32 and the outer cylinder 31, a plurality of cleaning ports are provided on the outer cylinder 31, and an openable sealing cover 311 is provided on the cleaning port. After opening the sealing cover 311, the sludge between the inner cylinder 32 and the outer cylinder 31 can be cleaned from the cleaning port without disassembling the inner cylinder 32 and the outer cylinder 31.

[0028] To facilitate installation of the drain pipe 100 , drain ports are provided on both the left and right sides of the outer cylinder 31 . The drain pipe 100 can be installed on the left side of the barrel 3 or on the right side of the barrel 3 .

[0029] The inner wall upper end of the inner cylinder 32 is provided with a chamfer R1 for guiding the filter cloth to enter the barrel 3, so that the filter cloth can smoothly enter the barrel 3 and avoid the barrel 3 from scratching the filter cloth. The barrel 3 also includes an upper sealing plate 35 and a lower sealing plate 36, which are sleeved outside the inner cylinder 32 and fixed by welding to the inner cylinder 32, and the outer cylinder 31 is sandwiched between the upper sealing plate 35 and the lower sealing plate 36 and fixed by welding to the upper sealing plate 35 and the lower sealing plate 36.

[0030] To facilitate the maintenance of the barrel 3, the barrel 3 is placed on the bottom plate 2 and connected to the bottom plate 2 in a detachable manner. The barrel 3 can be removed for maintenance when necessary. The lower side of the barrel 3 and the bottom plate 2 are sealed with glue to prevent water in the inner barrel 32 from seeping out from between the barrel 3 and the bottom plate 2.

[0031] See also Figure 8 and 9 To facilitate the installation of the barrel 3, the bottom plate 2 includes an inner support plate 21 for supporting the lower top plate 5 and an outer support plate 22 for supporting the barrel 3. The outer support plate 22 surrounds the inner support plate 21, and the outer support plate 22 and the inner support plate 21 are welded to achieve a seal between the outer support plate 22 and the inner support plate 21; there is a thickness difference between the inner support plate 21 and the outer support plate 22, so that the edge of the inner support plate 21 has a positioning effect on the installation of the barrel 3, and the lower end of the inner wall of the inner barrel 32 is provided with a circle of chamfer R2 for guiding the installation of the barrel 3.

[0032] To prevent the barrel 3 from tilting, which would cause the upper pressing plate 4 to be misaligned with the barrel 3, the lower sealing plate 36 is fixed to the bottom plate 2 by bolts, and the upper sealing plate 35 is fixed to the frame 1 by bolts, see Figure 8 and 9 A fixing block 11 for fixing the upper sealing plate 35 is provided on the frame 1.

[0033] In order to prevent the water in the inner cylinder 32 from seeping from between the lower top plate 5 and the inner support plate 21 to the lower driving mechanism 51 and causing corrosion to the lower driving mechanism 51, the upper side of the inner support plate 21 is formed with a first boss 211 by milling. The gap between the edge of the lower top plate 5 and the inner cylinder 32 is smaller than the gap between the edge of the first boss 211 and the inner cylinder 32. Therefore, when the lower top plate 5 is supported by the bottom plate 2, the lower top plate 5 is placed on the first boss 211, and a circle of water storage space S is formed around the first boss 211 below the lower top plate 5 (see Figure 3 ).

[0034] A circle of second bosses 212 is arranged on the upper side of the first boss 211 around the connection between the lower driving mechanism 51 and the lower top plate 5, and a circle of clearance grooves 54 is arranged on the lower side of the lower top plate 5 corresponding to the circle of second bosses 212. When the lower top plate 5 is supported by the first boss 211, the second bosses 212 are inserted into the clearance grooves 54 to prevent water in the inner cylinder 32 from seeping into the lower driving mechanism 51. Fig.11 After the water squeezed out of the sludge flows into the space between the lower top plate 5 and the inner tube 32, Fig.11 The direction indicated by the middle arrow is discharged from the inner cylinder 32 through the drain hole 321 . Embodiment 2

[0035] A multi-layer stacked solid-liquid separation system includes a filter cloth retracting and releasing mechanism for retracting and releasing filter cloth, a material spreading trolley for spreading mud on the filter cloth, a cloth pressing mechanism for pressing the filter cloth during the material spreading stage, and a high-pressure dehydration mechanism of the first embodiment, wherein the high-pressure dehydration mechanism is located in front of the filter cloth retracting and releasing mechanism. The cloth pressing mechanism includes a pressing block and a power mechanism for driving the pressing block to move, and the pressing block is divided into a front pressing block located in front of an upper pressing plate 4 and a rear pressing block located behind the upper pressing plate 4, refer to patent document CN221094005U.

[0036] The upper side of the upper sealing plate 35 is provided with a sunken table 351 for making way for the rear pressing block. When the upper body of the material spreading trolley moves forward and pushes the filter cloth, the filter cloth is pressed by the rear pressing block. Since the filter cloth is pressed on the sunken table 351 by the rear pressing block, the upper body can pass over the rear pressing block even if it is at a lower position. If the upper side of the upper sealing plate 35 is not provided with a sunken table 351 for making way for the rear pressing block, the upper body needs to be set at a higher position to pass over the rear pressing block.

[0037] In order to increase the space between the inner cylinder 32 and the outer cylinder 31 and improve the drainage performance, the front wall of the outer cylinder 31 is a folded plate, so that the distance between the middle and lower parts of the front wall of the outer cylinder 31 and the inner cylinder 32 is larger than the distance between the upper part of the front wall of the outer cylinder 31 and the inner cylinder 32; the rear wall of the outer cylinder 31 is a folded plate, so that the distance between the middle and lower parts of the rear wall of the outer cylinder 31 and the inner cylinder 32 is larger than the distance between the upper part of the rear wall of the outer cylinder 31 and the inner cylinder 32.

[0038] A pressure strip 56 is respectively provided on the front side and the rear side of the lower top plate 5 . The pressure strip 56 is detachably mounted on the lower top plate 5 for fixing the filter cloth.

Claims

1. A high-pressure dehydration mechanism, used in a multi-layer stacked solid-liquid separation system, the high-pressure dehydration mechanism comprising a frame (1), a bottom plate (2), a barrel (3), an upper pressing plate (4), an upper driving mechanism (41), a lower top plate (5) and a lower driving mechanism (51); the upper driving mechanism and the bottom plate are respectively fixed on the frame; the barrel comprises an outer barrel (31) provided with a drainage port and an inner barrel (32) provided with a drainage hole (321); the lower top plate is used to carry the filter cloth and sludge stacked in the barrel; the lower driving mechanism is fixed on the bottom plate, the driving end of which passes through the bottom plate and is used to drive the lower top plate to move up and down; the upper pressing plate is located above the lower top plate, the driving end of the upper driving mechanism is connected to the upper pressing plate and is used to drive the upper pressing plate to press the filter cloth and sludge stacked on the lower top plate to dehydrate the sludge, and the squeezed water is discharged from the drainage hole into between the outer barrel and the inner barrel, and then discharged from the barrel from the drainage port, characterized in that: The lower surface of the upper pressing plate is convex downward, and the amount of the convexity gradually decreases from the center to the edge.

2. The high pressure dehydration mechanism according to claim 1, characterized in that: The upper pressing plate has a rectangular structure / square structure / circular structure, and the protrusion of the lower surface of the upper pressing plate gradually decreases from the center point to the edge, and the ratio of the protrusion at the center point to the short side length / side length / diameter of the upper pressing plate is between 1% and 5%.

3. The high pressure dehydration mechanism according to claim 1, characterized in that: The driving end of the lower driving mechanism is provided with a plurality of guide holes, and guide bolts (52) are passed through the guide holes from bottom to top. The guide bolts are threadedly connected to the lower top plate. When the lower top plate is supported by the bottom plate, a gap (G) exists between the driving end of the lower driving mechanism and the lower top plate.

4. The high pressure dehydration mechanism according to claim 3, characterized in that: A limiting groove (53) is provided on the lower side of the lower top plate corresponding to the driving end of the lower driving mechanism. When the lower top plate is supported by the driving end of the lower driving mechanism, the driving end of the lower driving mechanism is embedded in the limiting groove.

5. The high pressure dehydration mechanism according to claim 1, characterized in that: The drain hole is a strip-shaped structure extending from the upper end to the lower end of the inner cylinder, and a plurality of drain holes are evenly arranged side by side on the inner cylinder; a plurality of transverse reinforcing rib plates (33) and longitudinal reinforcing rib plates (34) are arranged on the outer side of the inner cylinder, and a water outlet gap is left between the transverse reinforcing rib plates and the longitudinal reinforcing rib plates and the outer cylinder.

6. The high pressure dehydration mechanism according to claim 1, characterized in that: The barrel is placed on the bottom plate and connected to the bottom plate in a detachable manner. A sealing ring or glue seal is arranged between the lower side of the barrel and the bottom plate to prevent water in the inner barrel from seeping out from between the barrel and the bottom plate.

7. The high pressure dehydration mechanism according to claim 1 or 6, characterized in that: A first boss (211) is provided on the upper side of the bottom plate corresponding to the lower top plate, and the gap between the edge of the lower top plate and the inner tube is smaller than the gap between the edge of the first boss and the inner tube; when the lower top plate is supported by the bottom plate, the lower top plate is placed on the first boss, and a circle of water storage space (S) is formed below the lower top plate around the first boss.

8. The high pressure dehydration mechanism according to claim 1, 6 or 7, characterized in that: A circle of second bosses (212) is provided on the upper side of the bottom plate around the connection between the lower drive mechanism and the lower top plate, and a circle of clearance grooves (54) is provided on the lower side of the lower top plate corresponding to the circle of second bosses. When the lower top plate is supported by the bottom plate, the second bosses are inserted into the clearance grooves to prevent water in the inner cylinder from seeping into the lower drive mechanism.

9. The high pressure dehydration mechanism according to claim 6, characterized in that: The bottom plate comprises an inner support plate (21) for supporting the lower top plate and an outer support plate (22) for supporting the barrel. The outer support plate surrounds the inner support plate. The outer support plate and the inner support plate are welded to achieve sealing between the outer support plate and the inner support plate. The edge of the inner support plate has a positioning function for the installation of the barrel. The lower end of the inner wall of the barrel is provided with a chamfer (R2) for guiding the installation of the barrel.

10. The high pressure dehydration mechanism according to claim 1, characterized in that: The outer cylinder is provided with a plurality of cleaning ports, and the upper covers of the cleaning ports are provided with openable sealing covers (311).

11. The high pressure dehydration mechanism according to claim 1, characterized in that: The lower end of the barrel is fixed on the bottom plate, and the upper end of the barrel is fixed on the frame.

12. The high pressure dehydration mechanism according to claim 1, characterized in that: The upper end of the inner wall of the barrel is provided with a chamfer (R1) for guiding the filter cloth to enter the barrel.

13. A multi-layer stacked solid-liquid separation system, comprising a filter cloth retracting and releasing mechanism for retracting and releasing filter cloth, a material spreading trolley for spreading mud on the filter cloth, and a cloth pressing mechanism for pressing the filter cloth during the material spreading stage, characterized in that: The multi-layer stacked solid-liquid separation system comprises the high-pressure dehydration mechanism as claimed in any one of claims 1 to 12.

14. The multi-layer stacked solid-liquid separation system according to claim 13, characterized in that: The cloth pressing mechanism comprises a pressing block / pressing rod and a power mechanism for driving the pressing block / pressing rod to move. The high-pressure dehydration mechanism is located in front of the filter cloth retracting and releasing mechanism. The pressing block / pressing rod is divided into a front pressing block / pressing rod located in front of the upper pressing plate and a rear pressing block / pressing rod located behind the upper pressing plate. A sinking table (351) is provided on the upper side of the barrel for making way for the rear pressing block / pressing rod.

15. The multi-layer stacked solid-liquid separation system according to claim 14, characterized in that: The front wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the front wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the front wall of the outer cylinder and the inner cylinder; the rear wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the rear wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the rear wall of the outer cylinder and the inner cylinder.

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