A sludge dewatering device

Abstract

The present invention relates to the technical field of sludge dewatering, and discloses a sludge dewatering device, including a centrifugal mechanism and a sludge briquetting mechanism, the centrifugal mechanism includes an outer cylinder, the sludge briquetting mechanism includes a collecting barrel, the outer cylinder is connected to the end of the collecting barrel, a central axis is arranged in the middle of the outer cylinder, an extended end of the central axis passes through the outside of the collecting barrel, the central axis is located inside the outer cylinder and is provided with a water discharge port and a mud discharge port, the central axis is located inside the collecting barrel and is provided with a main mud outlet hole and an auxiliary mud outlet hole; the present invention drives an extrusion device to move through the central axis through the central axis, and the small sludge lumps discharged from the central axis are squeezed into large lumps by the extrusion device, and finally form semicircular fan-shaped columnar blocks, which are discharged from the collecting barrel, which is beneficial to the centralized discharge of the sludge, thereby facilitating the transportation and centralized processing of the sludge after dewatering.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge dewatering, and particularly to a sludge dewatering device. Background Art

[0002] Sludge dewatering is a sludge treatment method that removes water from fluid raw, concentrated or digested sludge and converts it into semi-solid or solid sludge cakes. After sludge dewatering, it is usually subjected to sanitary landfill, land organic fertilizer utilization, building material production, energy recovery. Among them, sludge containing straw can be processed into biofuels such as biodiesel, providing a new way for energy supply.

[0003] Centrifugal sludge dewatering machines are commonly used sludge dewatering equipment in the existing market. They use the centrifugal force generated by high-speed rotation to achieve solid-liquid separation, with strong processing capacity, high dewatering efficiency, capable of processing a large amount of sludge in a short time, and the water content of the obtained sludge cake is relatively low. However, the existing centrifugal sludge dewatering machines still have deficiencies in actual use: after the sludge is separated from the water, the sludge is transported to the outside of the cylinder through the internal channel of the central shaft, and the discharged sludge is in small pieces and needs to be collected with containers, which is difficult to centrally process during transportation and subsequent processing. Moreover, during the process of processing sludge containing solid impurities, the straw in the sludge has a large volume, and the sludge moves slowly through the internal channel of the central shaft, affecting the sludge discharge efficiency. Summary of the Invention

[0004] The present invention proposes a sludge dewatering device to solve the problem that it is difficult to centrally process the sludge after dewatering during transportation and subsequent processing.

[0005] To achieve the above object, the present invention provides the following technical solution: A sludge dewatering device includes a centrifugal mechanism and a sludge briquetting mechanism. The centrifugal mechanism includes an outer cylinder, and the sludge briquetting mechanism includes an aggregate cylinder. The outer cylinder is connected to the end of the aggregate cylinder. A central shaft is provided in the middle of the outer cylinder, and the extended end of the central shaft penetrates to the outside of the aggregate cylinder. The central shaft is provided with a drainage port and a sludge discharge port inside the outer cylinder, and a main sludge discharge hole and a secondary sludge discharge hole are provided inside the aggregate cylinder.

[0006] An extrusion device is provided inside the aggregate cylinder between the main sludge discharge hole and the secondary sludge discharge hole. The central shaft penetrates through the middle of the extrusion device. The extrusion device includes a central sliding seat. Cutting plates are provided on both side walls of the central sliding seat. A first spring is provided on one side of the cutting plate, and a pressing plate is provided at the end of the first spring. Two groups of movable discharge plates are provided on the outer wall of the aggregate cylinder.

[0007] Sliders extending outward from the aggregate cylinder are provided at both the top and bottom of the central sliding seat. Threaded rods are provided at the extended ends of the two sliders, and a reversing mechanism for driving the rotation of the threaded rods is provided at the extended end of the central shaft.

[0008] Preferably, the centrifugal mechanism further includes a feed box. A support seat is provided outside the feed box, and a base is fixed to the bottom of the support seat. One end of the feed box is connected to the end of the outer cylinder. A spiral blade is provided on the outer wall of the central shaft, and an inner cylinder is provided on the outer wall of the spiral blade. The inner cylinder is fixed to the inner wall of the outer cylinder. One end of the inner cylinder close to the aggregate cylinder is conical, and an end plate is fixed to the conical end of the inner cylinder. The sludge discharge port is located at the position of the central shaft close to the conical end of the inner cylinder.

[0009] Preferably, a driving device for driving the rotation of the central shaft is provided on one side of the feed box. A water outlet is provided on the side of the central shaft close to the driving device, and a water outlet pipe is connected to one side of the water outlet. A partition is provided on the side of the central shaft close to the sludge discharge port inside the central shaft. The central shaft is of a hollow structure. The inside of the central shaft on one side of the partition is a water flow channel, and the other side is a sludge discharge channel. The drainage port, the water outlet, and the water outlet pipe are all communicated with the water flow channel.

[0010] Preferably, a left stop block and a right stop block are further provided inside the aggregate cylinder. A first aggregate cavity is provided between the left stop block and the extrusion device, and a second aggregate cavity is provided between the right stop block and the extrusion device. Each group of discharge plates includes two semi-circular plates. The two groups of discharge plates are respectively located on both sides of the first aggregate cavity and the second aggregate cavity. Fixed seats are symmetrically provided on both sides of the aggregate cylinder, and cylinders are fixed on the fixed seats. The telescopic ends of the cylinders are connected to the outer walls of the discharge plates.

[0011] Preferably, chutes are provided at both the top and bottom of the aggregate cylinder, and the sliders slide in the chutes.

[0012] Preferably, a reduction gearbox is provided at the end of the central shaft, and a driving gear is provided at the end of the output shaft of the reduction gearbox.

[0013] Preferably, the reversing mechanism includes a main shaft provided on one side of the driving gear. A driven gear and a reversing gear are fixed to the outside of the main shaft. The driven gear meshes with the driving gear. An intermediate gear shaft is provided on one side of the main shaft, and an intermediate gear is fixed to the outside of the intermediate gear shaft. The intermediate gear meshes with the reversing gear. A screw gear is provided on the outside of the threaded rod, and the screw gear can mesh with the driven gear or the intermediate gear.

[0014] Preferably, a mounting seat is provided at the end of the main shaft, an electric push rod is provided on one side of the mounting seat, the telescopic end of the electric push rod is connected to a guide rod, a clamping block is fixed at the end of the guide rod, and an axle seat is fixed at the end of the clamping block, the axle seat is provided with two bearings, and the main shaft and the intermediate gear shaft pass through the two bearings respectively.

[0015] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0016] (1) A central axis is set up, which runs through the centrifugal mechanism, and a collecting barrel is set at the extended end of the central axis outside the centrifugal mechanism. An extrusion device is set inside the collecting barrel. The extrusion device is driven by the central axis to move. The small sludge blocks discharged from the central axis are squeezed into large blocks by the extrusion device, and finally form semicircular fan-shaped column blocks and are discharged from the collecting barrel, which is conducive to the centralized discharge of sludge, thereby facilitating the transportation and centralized processing of sludge after dehydration.

[0017] (2) A reversing mechanism is provided, and a reduction box is provided between the reversing mechanism and the central shaft. The central shaft drives the internal structure of the centrifugal mechanism to separate the sludge and water, and at the same time drives the reduction mechanism and the reversing mechanism inside the reduction box to rotate. After the position of the gears in the reversing mechanism changes, the extrusion device moves in the opposite direction. By adjusting the gear position of the reversing mechanism, the extrusion device can move back and forth in the collecting barrel, so that the sludge in the collecting barrel can be continuously squeezed left and right, so that the accumulated sludge in the collecting barrel can be handled in time, and the problem of sludge clogging in the central shaft and the collecting barrel can be avoided, which is conducive to the smooth discharge of sludge.

[0018] (3) A crushing assembly is arranged outside the central axis in the collecting barrel. The crushing assembly is located outside the mud outlet of the central axis. During the rotation of the central axis, the crushing assembly remains stationary. After the sludge is discharged from the mud outlet, it is quickly cut by the cutter head of the crushing assembly. Impurities such as straw mixed in the sludge can be cut into smaller particles. The smaller particle size can increase the contact area between microorganisms and straw, making it easier for microorganisms to attach to and decompose cellulose, hemicellulose and other difficult-to-degrade substances in the straw, thereby accelerating the decomposition rate of straw in the sludge and shortening the treatment cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the centrifugal mechanism of the present invention;

[0022] Figure 3 It is a three-dimensional view of the centrifugal mechanism of the present invention;

[0023] Figure 4 It is a three-dimensional view of the sludge briquetting mechanism of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the speed reducer and the commutation mechanism of the present invention;

[0025] Figure 6 It is a three-dimensional view of the speed reducer and the commutation mechanism of the present invention;

[0026] Figure 7 It is a schematic internal structure diagram of the aggregate cylinder of the present invention;

[0027] Figure 8 It is a schematic structural diagram of the left stop block and the crushing assembly of the present invention;

[0028] Figure 9 It is a three-dimensional view of the crushing assembly of the present invention;

[0029] Figure 10 It is an exploded view of the crushing assembly of the present invention;

[0030] Figure 11 It is a three-dimensional view of the cutter head of the present invention;

[0031] Figure 12 It is a three-dimensional view of the extrusion device of the present invention;

[0032] Figure 13 It is an exploded view of the extrusion device of the present invention.

[0033] In the figure:

[0034] 1. Driving device; 2. Feed box; 3. Outer cylinder; 4. Water outlet pipe; 5. Support seat; 6. Aggregate cylinder; 7. Fixed seat; 8. Cylinder; 9. Discharge plate;

[0035] 10. Commutation mechanism; 101. Main shaft; 102. Driven gear; 103. Commutation gear; 104. Intermediate gear shaft; 105. Intermediate gear; 106. Screw gear; 107. Driving gear; 108. Shaft seat; 109. Electric push rod; 1091. Guide rod;

[0036] 11. Mounting seat; 12. Central axis; 13. Water outlet; 14. Spiral blade; 15. Inner cylinder; 16. Drainage port; 17. Sludge discharge port; 18. Partition board; 19. Main sludge discharge hole; 20. Secondary sludge discharge hole; 21. End plate; 22. Base; 23. Threaded rod; 24. Slide block; 25. Speed reducer; 26. Clamping block;

[0037] 27. Left stop block; 271. Right stop block;

[0038] 28. Extrusion device; 281. Central sliding seat; 282. Pressing plate; 283. First spring; 284. Cutting plate;

[0039] 29. First aggregate chamber; 30. Second aggregate chamber; 31. Crushing assembly; 311. Tool bit; 312. Support block; 32. Chute; 33. Groove; 34. Mud outlet; 35. Second spring; 36. Telescopic rod; 37. Support plate; 38. Blade; 39. Through hole. Detailed implementation manner

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figures 1-13 shown, a sludge dewatering device includes a centrifugal mechanism and a sludge pressing block mechanism. The centrifugal mechanism includes an outer cylinder 3, and the sludge pressing block mechanism includes an aggregate cylinder 6. The end of the outer cylinder 3 is connected to the end of the aggregate cylinder 6. A central shaft 12 is provided in the middle of the outer cylinder 3. The extending end of the central shaft 12 penetrates to the outside of the aggregate cylinder 6. A drainage port 16 and a sludge discharge port 17 are provided in the outer cylinder 3 where the central shaft 12 is located. A main sludge discharge hole 19 and a secondary sludge discharge hole 20 are provided in the aggregate cylinder 6 where the central shaft 12 is located;

[0042] An extrusion device 28 is provided between the main sludge discharge hole 19 and the secondary sludge discharge hole 20 inside the aggregate cylinder 6. The central shaft 12 penetrates through the middle of the extrusion device 28. The extrusion device 28 includes a central sliding seat 281. Cutting plates 284 are provided on both side walls of the central sliding seat 281. A first spring 283 is provided on one side of the cutting plate 284. A pressing plate 282 is provided at the end of the first spring 283. Two groups of movable discharge plates 9 are provided on the outer wall of the aggregate cylinder 6;

[0043] Sliders 24 extending towards the outside of the aggregate cylinder 6 are provided at the top and bottom of the central sliding seat 281. Threaded rods 23 are provided at the extending ends of the two sliders 24. A reversing mechanism 10 for driving the threaded rod 23 to rotate is provided at the extending end of the central shaft 12.

[0044] During the sludge dewatering process, the sludge is transported to the feed box 2 through an external sludge pump. Due to the gravity of the sludge itself, the sludge flows into the centrifugal mechanism. Under the centrifugal action of the centrifugal mechanism, the sludge is separated from the water. The reversing mechanism 10 is driven to rotate by the central shaft 12. During the rotation of the reversing mechanism 10, the threaded rod 23 is driven to rotate. The slider 24 moves on the threaded rod 23, and the slider 24 drives the extrusion device 28 to move. The extrusion device 28 reciprocates left and right, and the extrusion device 28 extrudes the sludge multiple times. Since the cutting plate 284 is arranged on the side wall of the central sliding seat 281, during each extrusion process, the pressing plate 282 extrudes the sludge. The pressing plate 282 is subjected to the resistance of the sludge, and the pressing plate 282 compresses the first spring 283. The cutting plate 284 is exposed to the outside, and the cutting plate 284 cuts the cylindrical sludge block into two semi-circular sector-shaped columnar blocks. After the discharge plate 9 is opened, the semi-circular sector-shaped columnar blocks fall outside the aggregate cylinder 6.

[0045] As Figures 1-3 shown, the centrifugal mechanism further includes a feed box 2. A support seat 5 is arranged outside the feed box 2. The bottom of the support seat 5 is fixed with a base 22. One end of the feed box 2 is connected to the end of the outer cylinder 3. A spiral blade 14 is arranged on the outer wall of the central shaft 12. An inner cylinder 15 is arranged outside the spiral blade 14. The inner cylinder 15 is fixed to the inner wall of the outer cylinder 3. One end of the inner cylinder 15 close to the aggregate cylinder 6 is conical, and an end plate 21 is fixed at the conical end of the inner cylinder 15. The sludge discharge port 17 is located at the position of the central shaft 12 close to the conical end of the inner cylinder 15;

[0046] A driving device 1 for driving the central shaft 12 to rotate is arranged on one side of the feed box 2. A water outlet 13 is opened on one side of the central shaft 12 close to the driving device 1. A water outlet pipe 4 is connected to one side of the water outlet 13. A partition plate 18 is arranged on one side of the central shaft 12 close to the sludge discharge port 17. The central shaft 12 is of a hollow structure. The inner part of the central shaft 12 on one side of the partition plate 18 is a water flow channel, and the other side is a sludge discharge channel. The drain port 16, the water outlet 13 and the water outlet pipe 4 are all communicated with the water flow channel;

[0047] During the dehydration process, the driving device 1 drives the central shaft 12 to rotate at a high speed. It should be noted here that in the prior art, the driving device 1 of the centrifugal sludge dehydrator mainly drives the central shaft 12 by a centrifugal motor, and the rotational speed of the central shaft 12 is between 2500 - 3000 rpm. During the high-speed rotation of the central shaft 12, due to the different densities of sludge and water, the sludge is thrown to the inner wall of the inner cylinder 15 under the influence of centrifugal force and forms a sludge layer. The water in the sludge is separated from the sludge and is located inside the sludge layer. Finally, the water enters the water flow channel from the drain port 16, then flows to the water outlet 13, and is discharged from the water outlet pipe 4. The sludge layer is pushed by the spiral blade 14 to the conical end of the inner cylinder 15 and enters the sludge discharge channel from the sludge discharge port 17. The sludge moves along the sludge discharge channel to the main sludge discharge hole 19 and the secondary sludge discharge hole 20, and is finally discharged from the main sludge discharge hole 19 and the secondary sludge discharge hole 20.

[0048] As Figure 1 and Figure 7 shown, a left stop block 27 and a right stop block 271 are further provided inside the aggregate cylinder 6. A first aggregate cavity 29 is formed between the left stop block 27 and the extrusion device 28, and a second aggregate cavity 30 is formed between the right stop block 271 and the extrusion device 28. Each group of discharge plates 9 includes two semi-circular arc plates. The two groups of discharge plates 9 are respectively located on both sides of the first aggregate cavity 29 and the second aggregate cavity 30. Fixed seats 7 are symmetrically arranged on both sides of the aggregate cylinder 6, and cylinders 8 are fixed on the fixed seats 7. The telescopic end of the cylinder 8 is connected to the outer wall of the discharge plate 9. Specifically, during the shortening process of the cylinder 8, the telescopic end of the cylinder 8 pulls the discharge plate 9, and the discharge plate 9 disengages from the aggregate cylinder 6. The first aggregate cavity 29 and the second aggregate cavity 30 inside the aggregate cylinder 6 are in an open state, and the semi-circular sector columnar blocks located in the first aggregate cavity 29 and the second aggregate cavity 30 fall outside the aggregate cylinder 6. After the cylinder 8 extends, the discharge plate 9 returns to its original position.

[0049] As Figure 1 and Figures 4-7 shown, a speed reducer 25 is provided at the end of the central shaft 12. The input shaft of the speed reducer 25 is connected to the end of the central shaft 12 through a coupling, and a driving gear 107 is provided at the end of the output shaft of the speed reducer 25. The inside of the speed reducer 25 is a multi-stage gear reduction mechanism. The specific gear reduction mechanism has been disclosed in the prior art and will not be elaborated here.

[0050] As Figure 1 and Figures 4-7As shown, chutes 32 are provided at both the top and bottom of the aggregate cylinder 6. The slider 24 slides in the chute 32. The reversing mechanism 10 includes a main shaft 101 disposed on one side of the driving gear 107. A driven gear 102 and a reversing gear 103 are fixed to the outside of the main shaft 101. The driven gear 102 meshes with the driving gear 107. An intermediate gear shaft 104 is disposed on one side of the main shaft 101. An intermediate gear 105 is fixed to the outside of the intermediate gear shaft 104. The intermediate gear 105 meshes with the reversing gear 103. A screw gear 106 is disposed on the outside of the threaded rod 23. The screw gear 106 can mesh with either the driven gear 102 or the reversing gear 103;

[0051] An installation seat 11 is provided at the end of the main shaft 101. An electric push rod 109 is disposed on one side of the installation seat 11. A guide rod 1091 is connected to the telescopic end of the electric push rod 109. A clamping block 26 is fixed to the end of the guide rod 1091. A shaft seat 108 is fixed to the end of the clamping block 26. Two bearings are provided on the shaft seat 108. The main shaft 101 and the intermediate gear shaft 104 respectively penetrate through the two bearings;

[0052] During the reversing operation, by starting the electric push rod 109, when the electric push rod 109 extends, the telescopic end of the electric push rod 109 pushes the guide rod 1091, the guide rod 1091 pulls the clamping block 26, the clamping block 26 drives the shaft seat 108, the shaft seat 108 drives the main shaft 101 and the intermediate gear shaft 104, and the main shaft 101 drives the driven gear 102. Prior to this, the central shaft 12 always rotates in the same direction. The rotation direction of the input shaft of the speed reducer 25 is the same as that of the central shaft 12. The rotation direction of the reduction mechanism inside the speed reducer 25 always remains unchanged. The rotation direction of the output shaft of the speed reducer 25 remains unchanged. The rotation direction of the driving gear 107 remains unchanged. The rotation direction of the driven gear 102 remains unchanged;

[0053] When the driven gear 102 rotates, it drives the screw gear 106 to rotate. At this time, the screw gear 106 drives the threaded rod 23 to rotate. During the rotation of the threaded rod 23, the slider 24 moves horizontally on the threaded rod 23, and the slider 24 drives the extrusion device 28 to move towards the left stop block 27;

[0054] When the electric push rod 109 shortens, the telescopic end of the electric push rod 109 pulls the guide rod 1091, the guide rod 1091 pushes the clamping block 26, the clamping block 26 pushes the shaft seat 108, the shaft seat 108 pushes the intermediate gear shaft 104 and the main shaft 101 to move, the main shaft 101 pushes the reversing gear 103 to move, the intermediate gear shaft 104 pushes the intermediate gear 105 to move, and the intermediate gear 105 meshes with the screw gear 106. At this time, the rotation direction of the screw gear 106 changes, and the rotation direction of the threaded rod 23 also changes. The slider 24 moves in the opposite direction, and the extrusion device 28 moves to the right and cooperates with the right stop block 271 to extrude the sludge discharged from the secondary sludge outlet 20.

[0055] As shown Figures 7-11 As shown, the ends of the left stop block 27 and the right stop block 271 are both provided with a crushing assembly 31. The crushing assembly 31 includes a cutter head 311. The cutter head 311 includes a plurality of annular blades 38. A through hole 39 is formed in the middle of each blade 38. Two mud outlets 34 are symmetrically formed on the outer wall of the cutter head 311. The mud outlets 34 communicate with the through hole 39;

[0056] A support piece 37 is arranged at the end of the cutter head 311. A plurality of second springs 35 and a plurality of telescopic rods 36 are arranged at the end of the support piece 37. The ends of the second springs 35 and the telescopic rods 36 are provided with another support piece 37. A support block 312 is fixed to the end face of this support piece 37. Grooves 33 are formed at the ends of the left stop block 27 and the right stop block 271. The support block 312 is fixed in the grooves 33;

[0057] After the sludge is dehydrated, it enters the interior of the central shaft 12 from the sludge discharge port 17 and moves to the main sludge discharge hole 19 and the secondary sludge discharge hole 20 along with the sludge discharge channel. Due to the continuous rotation of the central shaft 12, the sludge is thrown out from the main sludge discharge hole 19 and the secondary sludge discharge hole 20. At the moment of being thrown out, the blade 38 cuts and crushes the sludge and impurities such as straw mixed in the sludge, making the impurities such as straw in the sludge finer. The finer the straw is cut, the more easily the nutrients such as nitrogen, phosphorus, potassium and various trace elements in it are released, and can be more quickly utilized by the microorganisms in the sludge, and then converted into nutrients that can be absorbed by plants, improving the fertilizer efficiency of the sludge. Among them, the fine straw particles can be better mixed with the sludge evenly, making the texture of the sludge looser, enhancing the air permeability and water permeability, and being beneficial to the growth and reproduction of aerobic microorganisms in the sludge, further improving the treatment effect and stability of the sludge;

[0058] Specifically, during the process of the extrusion device 28 extruding the sludge, when the extrusion device 28 moves towards the left stop block 27 or the right stop block 271, the pressing plate 282 contacts the cutter head 311 of the crushing assembly 31 and presses the cutter head 311. The cutter head 311 pushes the support piece 37, and the support piece 37 presses the second springs 35 and the telescopic rods 36. The second springs 35 are compressed, and at the same time the telescopic rods 36 shorten. The cutter head 311 moves into the groove 33 of the left stop block 27 or the right stop block 271, so that the pressing plate 282 and the surface of the left stop block 27 or the right stop block 271 mutually extrude the sludge to compact the sludge into a plate shape. During the process of the extrusion device 28 reciprocating left and right, when not in contact with the cutter head 311, the second springs 35 bounce the cutter head 311 back to its original position.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sludge dewatering device, comprising a centrifugal mechanism and a sludge briquetting mechanism, characterized in that: The centrifugal mechanism comprises an outer cylinder (3), and the sludge briquetting mechanism comprises a collecting barrel (6). The outer cylinder (3) is connected to the end of the collecting barrel (6). A central axis (12) is provided in the middle of the outer cylinder (3). The extended end of the central axis (12) passes through the outside of the collecting barrel (6). The central axis (12) is located inside the outer cylinder (3) and is provided with a water discharge port (16) and a sludge discharge port (17). The central axis (12) is located inside the collecting barrel (6) and is provided with a main sludge discharge hole (19) and an auxiliary sludge discharge hole (20). An extrusion device (28) is provided inside the collecting barrel (6) between the main mud outlet hole (19) and the auxiliary mud outlet hole (20); the central axis (12) passes through the middle of the extrusion device (28); the extrusion device (28) comprises a central slide seat (281); both side walls of the central slide seat (281) are provided with cutting plates (284); a first spring (283) is provided on one side of the cutting plate (284); a pressure plate (282) is provided at the end of the first spring (283); and two sets of movable discharge plates (9) are provided on the outer wall of the collecting barrel (6); The top and bottom of the central slide seat (281) are both provided with sliders (24) extending toward the outside of the collecting barrel (6), the extended ends of the two sliders (24) are both provided with threaded rods (23), and the extended end of the central shaft (12) is provided with a reversing mechanism (10) for driving the threaded rods (23) to rotate; A left stopper (27) and a right stopper (271) are further provided inside the collecting barrel (6); a crushing assembly (31) is provided at the ends of the left stopper (27) and the right stopper (271); the crushing assembly (31) comprises a cutter head (311); the cutter head (311) comprises a plurality of annular blades (38); a through hole (39) is provided in the middle of each blade (38); two mud outlets (34) are symmetrically provided on the outer wall of the cutter head (311); the mud outlets (34) are in communication with the through holes (39); A support sheet (37) is provided at the end of the cutter head (311), a plurality of second springs (35) and a plurality of telescopic rods (36) are provided at the end of the support sheet (37), another support sheet (37) is provided at the ends of the second springs (35) and the telescopic rods (36), a support block (312) is fixed to the end surface of the support sheet (37), and grooves (33) are provided at the ends of the left stopper (27) and the right stopper (271), and the support block (312) is fixed in the groove (33).

2. A sludge dewatering device according to claim 1, characterized in that: The centrifugal mechanism further comprises a feed box (2), the outside of which is provided with a support seat (5), the bottom of which is fixed with a base (22), one end of the feed box (2) is connected to the end of the outer cylinder (3), the outer wall of the central axis (12) is provided with a spiral blade (14), the outside of which is provided with an inner cylinder (15), the inner cylinder (15) is fixed to the inner wall of the outer cylinder (3), the end of the inner cylinder (15) close to the collecting barrel (6) is conical, and the conical end of the inner cylinder (15) is fixed with an end plate (21), and the mud discharge port (17) is located at the conical end of the central axis (12) close to the inner cylinder (15).

3. A sludge dewatering device according to claim 2, characterized in that: A driving device (1) for driving the central shaft (12) to rotate is arranged on one side of the feed box (2); a water outlet (13) is provided on a side of the central shaft (12) close to the driving device (1); a water outlet pipe (4) is connected to one side of the water outlet (13); a partition plate (18) is arranged on the inner side of the central shaft (12) close to the mud discharge port (17); the central shaft (12) is a hollow structure; the inner side of the central shaft (12) located on one side of the partition plate (18) is a water flow channel, and the other side is a mud discharge channel; the drainage port (16), the water outlet (13) and the water outlet pipe (4) are all in communication with the water flow channel.

4. A sludge dewatering device according to claim 1, characterized in that: A first material collecting cavity (29) is provided between the left stopper (27) and the extrusion device (28), and a second material collecting cavity (30) is provided between the right stopper (271) and the extrusion device (28). Each group of the discharge plates (9) comprises two semicircular arc plates. The two groups of the discharge plates (9) are respectively located on both sides of the first material collecting cavity (29) and the second material collecting cavity (30). Fixed seats (7) are symmetrically provided on both sides of the collection barrel (6). A cylinder (8) is fixed on the fixed seat (7), and the telescopic end of the cylinder (8) is connected to the outer wall of the discharge plate (9).

5. A sludge dewatering device according to claim 1, characterized in that: The top and bottom of the collecting barrel (6) are both provided with sliding grooves (32), and the sliding block (24) slides in the sliding grooves (32).

6. A sludge dewatering device according to claim 1, characterized in that: A reduction gear box (25) is provided at the end of the central shaft (12), and a driving gear (107) is provided at the end of the output shaft of the reduction gear box (25).

7. A sludge dewatering device according to claim 6, characterized in that: The reversing mechanism (10) comprises a main shaft (101) arranged on one side of a driving gear (107); a driven gear (102) and a reversing gear (103) are fixed to the outside of the main shaft (101); the driven gear (102) is meshed with the driving gear (107); an intermediate gear shaft (104) is arranged on one side of the main shaft (101); an intermediate gear (105) is fixed to the outside of the intermediate gear shaft (104); the intermediate gear (105) is meshed with the reversing gear (103); and a screw gear (106) is arranged on the outside of the threaded rod (23); the screw gear (106) can be meshed with the driven gear (102) or the intermediate gear (105).

8. A sludge dewatering device according to claim 7, characterized in that: A mounting seat (11) is provided at the end of the main shaft (101), an electric push rod (109) is provided on one side of the mounting seat (11), a telescopic end of the electric push rod (109) is connected to a guide rod (1091), a clamping block (26) is fixed at the end of the guide rod (1091), a shaft seat (108) is fixed at the end of the clamping block (26), two bearings are provided on the shaft seat (108), and the main shaft (101) and the intermediate gear shaft (104) respectively penetrate the two bearings.

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