Negative pressure sludge discharger device

Abstract

The invention relates to the field of sludge treatment, in particular to a negative pressure sludge discharger device which comprises a bottom plate, semicircular covers, a filter pressing mechanism, a discharging mechanism, a cutting mechanism, an overflow mechanism, a hydraulic pump and a conveying belt mechanism, the semicircular covers are symmetrically arranged at the top of the bottom plate, the two semicircular covers are connected through a hinge, and one semicircular cover is connected with the bottom plate and the filter pressing mechanism. Cascade precipitation and automatic scraping cleaning of fine particles in filtrate are achieved through the V-shaped grooves in the overflow plate, anti-blocking is conducted on the filter cloth through negative pressure formed by rapid rising of the filter pressing block, and when mud cakes are discharged, sealing and leakage prevention are achieved through the leakage-proof plate, and even discharging is achieved through the inclined face of the cutting plate and the cutting groove. Therefore, the technical problems of sealing failure and frequent maintenance caused by easy blockage of filter cloth, easy blockage of a filter screen and residual discharged materials of the existing equipment are effectively solved, and the operation continuity and the dehydration efficiency of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, specifically to a negative pressure sludge discharge device. Background Technology

[0002] Sludge drying is a crucial step in environmental engineering, with the core objective of reducing sludge moisture content to facilitate subsequent disposal or resource utilization. In existing mechanical filtration equipment, to improve dewatering efficiency, bidirectional devices combining positive pressure filtration and negative pressure suction have emerged. For example, patent document CN118978310B proposes a sludge drying device based on negative pressure drainage. This device uses a rotating rod to drive the synchronous movement of a sealing disc and a piston disc, applying pressure above the screen plate and creating negative pressure below to achieve bidirectional dewatering of the sludge. Furthermore, through the cooperation of a guide groove and a limiting block, the push plate automatically opens the discharge trough after dewatering, pushing out the dried sludge cake.

[0003] After dewatering, the aforementioned equipment pushes the sludge cake on the screen plate out of the discharge trough using a pusher plate. However, during the resetting process, there are tiny gaps between the edge of the pusher plate and the inner wall of the processing tube and the surface of the screen plate. For highly viscous sludge, a small amount of sludge can easily be squeezed into these gaps during discharge, or form hanging residue at the discharge trough opening. When the pusher plate retracts from both sides to the middle, this residual sludge may fall onto the slide rail surface or back of the pusher plate. As the number of cycles increases, the sludge gradually accumulates and dries, forming hard sludge, which prevents the pusher plate from fully resetting to its initial closed position. Once the pusher plate cannot close, the sealing ring of the discharge trough cannot form an effective seal, and the sludge will leak from the discharge trough when pressurized in the next filter press cycle, requiring the equipment to be stopped for cleaning, affecting continuous operation efficiency.

[0004] In addition, existing equipment, including the aforementioned equipment, lacks an effective step-by-step sedimentation and self-cleaning mechanism. When processing filtrate containing fine particles, these particles are easily carried by the water flow and directly impact the end filter element, causing frequent clogging of the filter screen. This necessitates repeated shutdowns for disassembly and cleaning, further increasing the maintenance burden and operating costs of the equipment. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a negative pressure sludge discharge device, including a base plate, a semi-circular cover, a filter press mechanism, a discharge mechanism, a cutting mechanism, an overflow mechanism, a hydraulic pump and a conveyor belt mechanism. The top of the base plate is symmetrically provided with semi-circular covers, and the two semi-circular covers are connected by hinges. One of the semi-circular covers is connected to the base plate and the filter press mechanism respectively. The filter press mechanism includes a storage hopper, a first hydraulic cylinder, a filter block, a filter tube, a filter cloth, a filter plate, a support column, and a support ring plate. The inner ring of the support ring plate is connected to the upper end of the storage hopper, and the lower end of the storage hopper is connected to the filter tube. The upper end of the filter tube is equipped with a first hydraulic cylinder, which is connected to the support ring plate. The output end of the first hydraulic cylinder is connected to the filter block. The lower end of the filter block is equipped with a filter plate, and the upper and lower ends of the filter plate are respectively connected to the filter cloth and the support column. The support column is connected to the bottom plate, and the lower end of the filter tube is slidably connected to the discharge mechanism. The outer ring of the support column is equipped with an overflow mechanism. The overflow mechanism includes an overflow plate, a V-groove, a scraper, and an arc-shaped piston telescopic rod. The overflow plate is connected to the support column and is conical. A V-groove is formed on the conical surface of the overflow plate.

[0006] Furthermore, the V-shaped groove is slidably connected to the symmetrically arranged scraper blocks, the scraper blocks are connected to the output end of the arc-shaped piston telescopic rod, the arc-shaped piston telescopic rod is connected to the cutting mechanism, and the bottom of the scraper blocks is connected to the blocking mechanism.

[0007] Furthermore, the blocking mechanism includes a connecting rod, a first push rod, a second push rod, a pressure plate, a telescopic elastic element, and a support plate. The end of the connecting rod is connected to the bottom of the scraper block, and both ends of the connecting rod are connected to the first push rod and the second push rod, respectively. The ends of the first push rod and the second push rod are in transmission contact with the pressure plate. The bottom of the pressure plate is connected to one end of the telescopic elastic element, and the other end of the telescopic elastic element is connected to the support plate. The support plate is connected to the bottom of both ends of the overflow plate. The top of the pressure plate is connected to symmetrically arranged cylinders, and the top of the cylinders is connected to the diversion channel block. A filter screen is installed in the groove of the diversion channel block. The first push rod and the second push rod of the two connecting rods are arranged alternately.

[0008] Furthermore, the discharge mechanism includes a symmetrically arranged second hydraulic cylinder, a barrier ring plate, a third hydraulic cylinder, a propulsion plate, and a leak-proof plate. The second hydraulic cylinder is connected to the inner wall of the support ring plate, and the output end of the second hydraulic cylinder is connected to a barrier ring plate. The barrier ring plate is slidably connected to the filter press tube. A propulsion plate is provided on the outer wall of the barrier ring plate. Both ends of the propulsion plate are connected to one end of a symmetrically and horizontally arranged leak-proof plate. The two leak-proof plates are connected by a support rod. The outer wall of the propulsion plate is connected to the output end of the second hydraulic cylinder, and the second hydraulic cylinder is connected to a semi-circular cover.

[0009] Furthermore, the cutting mechanism includes a fourth hydraulic cylinder, a pressing plate, a cutting plate, an inclined surface, and a cutting groove. The fourth hydraulic cylinder is installed on the inner wall of the support ring plate, and the output end of the fourth hydraulic cylinder is connected to the pressing plate. The lower end of the pressing plate is provided with a cutting plate, and the cutting plate is connected to the filter plate.

[0010] Furthermore, the lower end of the cutting plate is provided with an inclined surface, and multiple cutting grooves are provided at equal intervals on the inclined surface.

[0011] Furthermore, a baffle plate is fixedly connected to the top center of the overflow plate, and a hollow rectangular groove is opened on the overflow plate outside the baffle plate. A conveyor belt mechanism is provided at the lower end of the rectangular groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The V-shaped groove set on the overflow plate forms a stepped sedimentation structure, which can effectively separate fine particles in the filtrate, prevent them from directly impacting the filter screen at the end, and extend the service life and maintenance cycle of the filter screen; at the same time, in conjunction with the linkage structure of the scraper and the blocking mechanism, the residual particles in the V-shaped groove can be automatically removed after each filtration, ensuring that the filtration effect of the next cycle is not affected, and improving the self-cleaning ability and continuous operation stability of the device.

[0013] (2) By using the closed filter press tube to form a local negative pressure when the filter press block rises rapidly, the filter cloth is cleaned by negative pressure back-blowing, which effectively removes the fine particles remaining in the pores of the filter cloth fibers, prevents the filter cloth from clogging, and ensures that the filtration efficiency does not decrease; at the same time, the anti-leak plate design in the discharge mechanism can play a sealing role during the mud cake push-out process, avoid mud leakage, and further improve the sealing and reliability of the device. (3) The lower end of the cutting plate is provided with an inclined surface and multiple cutting grooves at equal intervals, which can cut the mud cake into uniform small pieces after it is pushed out. The structural characteristics of the inclined surface and the cutting grooves are used to make the mud material fall in sequence, avoiding aggregation and adhesion, which facilitates the subsequent drying process of the conveyor belt mechanism, and improves the overall processing efficiency and quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the discharge mechanism of the present invention; Figure 4 This is a schematic diagram of the overflow mechanism of the present invention; Figure 5 for Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the bottom structure of the overflow mechanism of the present invention; Figure 7 This is a schematic diagram of the cutting plate of the present invention; Figure 8 This is a cross-sectional structural diagram of the present invention; Figure 9 This is a schematic diagram of the blocking mechanism of the present invention.

[0015] In the diagram: 1. Filter press mechanism; 11. Storage hopper; 12. First hydraulic cylinder; 13. Filter press block; 14. Filter press tube; 15. Filter cloth; 16. Filter plate; 17. Support column; 18. Support ring plate; 2. Discharge mechanism; 21. Second hydraulic cylinder; 22. Barrier ring plate; 23. Third hydraulic cylinder; 24. Push plate; 25. Leak-proof plate; 4. Cutting mechanism; 41. Fourth hydraulic cylinder; 42. Sludge pressing plate; 43. Cutting plate; 431. Inclined surface; 432. Cutting 5. Overflow mechanism; 51. Overflow plate; 511. V-shaped groove; 512. Water baffle; 52. Scraper; 53. Arc-shaped piston telescopic rod; 54. Barrier mechanism; 541. Connecting rod; 542. First push rod; 543. Second push rod; 544. Pressure plate; 545. Telescopic elastic element; 546. Support plate; 547. Drainage trough block; 548. Filter screen; 549. Cylindrical part; 6. Hydraulic pump; 7. Conveyor belt mechanism; 8. Semi-circular cover; 9. Base plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar terms used in this invention, mean that the element or object preceding the term encompasses the element or object listed following the term and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] like Figures 1 to 7 As shown, a negative pressure sludge discharge device includes a base plate 9, a semi-circular cover 8, a filter press mechanism 1, a discharge mechanism 2, a cutting mechanism 4, an overflow mechanism 5, a hydraulic pump 6, and a conveyor belt mechanism 7. The top of the base plate 9 is symmetrically provided with semi-circular covers 8, and the two semi-circular covers 8 are connected by hinges. One of the semi-circular covers 8 is connected to the base plate 9 and the filter press mechanism 1 respectively. The filter press mechanism 1 includes a storage hopper 11, a first hydraulic cylinder 12, a filter block 13, a filter tube 14, a filter cloth 15, a filter plate 16, a support column 17, and a support ring plate 18. The inner ring of the support ring plate 18 is connected to the upper end of the storage hopper 11, and the lower end of the storage hopper 11 is connected to the filter tube 14. The upper end of the filter tube 14 is provided with the first hydraulic cylinder 12, which is connected to the support ring plate 18. The output end of the first hydraulic cylinder 12 is connected to the filter block 13. The lower end of the filter block 13 is provided with the filter plate 16, and the upper and lower ends of the filter plate 16 are respectively connected to the filter cloth 15 and the support column 17. The support column 17 is connected to the bottom plate 9. The lower end of the filter tube 14 is slidably connected to the discharge mechanism 2. The outer ring of the support column 17 is provided with an overflow mechanism 5. The overflow mechanism 5 includes an overflow plate 51, a V-groove 511, a scraper 52, and an arc-shaped piston telescopic rod 53. The overflow plate 51 is connected to the support column 17. The overflow plate 51 is conical, and multiple V-grooves 511 are formed in a ring from the inside to the outside on the conical surface of the overflow plate 51.

[0019] The V-groove 511 is slidably connected to the symmetrically arranged scraper blocks 52. The scraper blocks 52 are connected to the output end of the arc-shaped piston telescopic rod 53. The arc-shaped piston telescopic rod 53 is connected to the cutting mechanism 4. The bottom of the scraper blocks 52 is connected to the blocking mechanism 54.

[0020] The blocking mechanism 54 includes a connecting rod 541, a first push rod 542, a second push rod 543, a pressure plate 544, a telescopic elastic element 545, and a support plate 546. The end of the connecting rod 541 is connected to the bottom of the scraper block 52, and the two ends of the connecting rod 541 are respectively connected to the first push rod 542 and the second push rod 543. The ends of the first push rod 542 and the second push rod 543 are in transmission contact with the pressure plate 544. The bottom of the pressure plate 544 is connected to one end of the telescopic elastic element 545, and the other end of the telescopic elastic element 545 is connected to the support plate 546. The support plate 546 is connected to the bottom of both ends of the overflow plate 51. The top of the pressure plate 544 is connected to symmetrically arranged cylinders 549. The top of the cylinders 549 is connected to the diversion channel block 547. A filter screen 548 is installed in the groove of the diversion channel block 547. The first push rod 542 and the second push rod 543 of the two connecting rods 541 are arranged alternately.

[0021] The discharge mechanism 2 includes a second hydraulic cylinder 21, a barrier ring plate 22, a third hydraulic cylinder 23, a push plate 24, and a leak-proof plate 25 arranged symmetrically. The second hydraulic cylinder 21 is connected to the inner wall of the support ring plate 18. The output end of the second hydraulic cylinder 21 is connected to a barrier ring plate 22. The barrier ring plate 22 is slidably connected to the filter tube 14. The outer wall of the barrier ring plate 22 is provided with a push plate 24. Both ends of the push plate 24 are connected to one end of the symmetrically and horizontally arranged leak-proof plates 25. The two leak-proof plates 25 are connected by a support rod. The outer wall of the push plate 24 is connected to the output end of the second hydraulic cylinder 21. The second hydraulic cylinder 21 is connected to a semi-circular cover 8.

[0022] The cutting mechanism 4 includes a fourth hydraulic cylinder 41, a pressing plate 42, a cutting plate 43, an inclined surface 431, and a cutting groove 432. The fourth hydraulic cylinder 41 is installed on the inner wall of the support ring plate 18. The output end of the fourth hydraulic cylinder 41 is connected to the pressing plate 42. The lower end of the pressing plate 42 is provided with the cutting plate 43, which is connected to the filter plate 16.

[0023] A bevel 431 is formed at the lower end of the cutting plate 43, and multiple cutting grooves 432 are formed at equal intervals on the bevel 431.

[0024] A baffle plate 512 is fixedly connected to the top center of the overflow plate 51. A hollow rectangular groove is opened on the overflow plate 51 outside the baffle plate 512. A conveyor belt mechanism 7 is set at the lower end of the rectangular groove. One end of the conveyor belt mechanism 7 is connected to the semi-circular cover 8 on both sides. The semi-circular cover 8 is provided with notches. The other end of the conveyor belt mechanism 7 passes through the semi-circular cover 8 and is provided with notches.

[0025] Working principle and usage process of this invention: In the first stage, the filtration and dewatering process involves adding the slurry to the storage hopper 11. At this time, the two semi-circular covers 8 are closed, forming a sealed working environment. The filtration mechanism 1 is activated, and the first hydraulic cylinder 12 drives the filter block 13 to move downward along the filter tube 14. The filter plate 16 and filter cloth 15 at the lower end of the filter block 13 apply high pressure to the slurry, causing the water in the slurry to separate. As the filter block 13 continues to descend, the slurry is gradually compressed into a mud cake until the filter block 13 reaches the preset position and the density of the mud cake reaches its maximum value. At this time, the first hydraulic cylinder 12 stops pressing due to increased resistance, indicating that the filtration is complete.

[0026] In the second stage, overflow purification occurs. During the pressure filtration process, the water squeezed out of the slurry passes through the filter cloth 15 and filter plate 16, and flows along the support column 17 into the overflow mechanism 5 below. The filtrate first reaches the conical overflow plate 51. Under the obstruction of the baffle plate 512, the water flows into the V-shaped groove 511 and flows evenly from the middle of the V-shaped groove 511 to both ends. The conical surface of the overflow plate 51 has multiple V-shaped grooves 511 arranged in a ring from the inside to the outside, forming a stepped sedimentation. The filtrate containing fine particles first flows into the uppermost first-stage V-shaped groove 511. During the flow, due to the settling effect of gravity, most of the fine particles are trapped and deposited in this stage of the V-shaped groove 511. Then, the overflow occurs step by step. When the uppermost V-shaped groove 511 reaches the bottom, the filtrate is completely filled with water. When the filtration efficiency of filter screen 548 decreases or it becomes clogged due to long-term use, its flow capacity weakens. If the liquid level rises or the initial filtrate flow rate exceeds the filtration capacity of filter screen 548, the filtrate will automatically overflow into the next adjacent V-shaped trough 511. The next V-shaped trough 511 continues to perform sedimentation filtration, and so on, with the filtrate flowing step by step towards the rear V-shaped trough 511, ultimately achieving fine filtration. After the stepwise sedimentation in multiple V-shaped troughs 511, most of the fine particles in the filtrate are removed. Because the middle section of the V-shaped trough 511 flows to both sides, it will pass through filter screen 548 and enter the groove of the guide trough block 547, flow through the inner wall of the semi-circular cover 8, and finally be discharged from the outside of the device through the opening in the semi-circular cover 8. This design makes full use of the sludge holding capacity of each sedimentation tank, extending the service life and maintenance cycle of filter screen 548.

[0027] To ensure that the V-groove 511 is clean at the start of each filter press cycle, and to prevent residual particles from being washed into the filter screen 548 and causing blockage during the next sludge-water impact, the device operates as follows: Automatic scraping after filter press completion. After each filter press cycle, the hydraulic pump 6 drives the arc-shaped piston telescopic rod 53 to move the scraper 52 back and forth once within the V-groove 511. Simultaneously, the scraper 52 drives the connecting rod 541, the first push rod 542, and the second push rod 543 to press down the pressure plate 544. This causes the telescopic elastic element 545, the cylinder 549, and the drainage channel block 547 to move downwards, preventing the scraper 52 from being blocked by the filter screen 548 when scraping residual particles from the V-groove 511. Finally, the residual particles are discharged from the V-groove 511 and carried out.

[0028] When filter screen 548 becomes clogged, its water flow capacity decreases, which can lead to water accumulation in the upstream V-shaped channel 511. When staff observe that the overflow water quality has deteriorated, they can determine the fault point by observing the water content of the V-shaped channel 511. If most of the V-shaped channels 511 are obviously filled with water and drainage is not smooth, it means that most of the end filter screen 548 has been clogged. At this time, it is only necessary to remove the clogged filter screen 548 for cleaning or replacement, without disassembling the entire overflow system.

[0029] After the filter press stage is completed, the discharge mechanism 2 is activated. The second hydraulic cylinder 21 acts first, pulling the blocking ring plate 22 to slide along the filter press tube 14, opening the outlet at the lower end of the filter press tube 14. Then, the third hydraulic cylinder 23 pushes the push plate 24, pushing the formed mud cake in the filter press tube 14 outward and then resetting. During this process, the leak-proof plate 25 connected to the upper end of the push plate 24 plays a sealing role, preventing the mud cake from entering the rear gap of the push plate 24 and preventing the mud cake from accumulating in the area above the scraper 52. Similarly, the leak-proof plate 25 at the lower end can prevent the push plate 24 from carrying the mud down during the return stroke, further preventing the scraper 52 from being unable to reset properly due to mud jamming, thus affecting the drainage and overflow operation of the overflow plate 51 and V-groove 511 below. After the filter cake is pushed out, the push plate 24 returns, and the second hydraulic cylinder 21 actuates again, pushing the blocking ring plate 22 to reset and closing the lower outlet of the filter press tube 14 again. Then, the first hydraulic cylinder 12 drives the filter press block 13 to rise rapidly. Since the lower end of the filter press tube 14 has been closed by the blocking ring plate 22, when the filter press block 13 rises rapidly, the space under the filter plate 16 and the filter cloth 15 expands instantly, forming a local negative pressure zone. Under the action of atmospheric pressure, external air enters at high speed in the reverse direction through the micropores of the filter cloth 15 and the filter plate 16, which strongly vibrates and peels off the fine particles remaining in the fiber pores of the filter cloth 15, realizing the negative pressure back-blowing cleaning of the filter cloth 15. This process effectively prevents the filter cloth 15 from clogging and ensures the filtration efficiency in the next filter press cycle.

[0030] After the mud cake is pushed out, the cutting mechanism 4 operates, and the fourth hydraulic cylinder 41 drives the pressing plate 42 to move downward. The cutting plate 43 connected to the lower end of the pressing plate 42 then cuts the mud cake. The lower end of the cutting plate 43 is designed with an inclined surface 431, and multiple cutting grooves 432 are equally spaced on the inclined surface 431. When the mud cake is cut into small pieces, due to the presence of the inclined surface 431, the small pieces of mud produced by cutting will not stay on the surface of the cutting plate 43. At the same time, the cutting grooves 432 located at the lower position of the inclined surface 431 have less adhesion surface, which will cause the mud to fall first, thereby ensuring that each piece of mud cut off falls into the conveyor belt mechanism 7 in sequence, which is beneficial to the next stage of drying and avoids the accumulation of mud.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A negative pressure sludge discharge device, comprising a base plate (9), a semi-circular cover (8), a filter press mechanism (1), a discharge mechanism (2), a cutting mechanism (4), an overflow mechanism (5), a hydraulic pump (6), and a conveyor belt mechanism (7), characterized in that, The bottom plate (9) is symmetrically provided with semi-circular covers (8) on the top. The two semi-circular covers (8) are connected by hinges. One of the semi-circular covers (8) is connected to the bottom plate (9) and the filter press (1) respectively. The filter press mechanism (1) includes a storage hopper (11), a first hydraulic cylinder (12), a filter block (13), a filter pipe (14), a filter cloth (15), a filter plate (16), a support column (17), and a support ring plate (18). The inner ring of the support ring plate (18) is connected to the upper end of the storage hopper (11), and the lower end of the storage hopper (11) is connected to the filter pipe (14). The upper end of the filter pipe (14) is provided with a first hydraulic cylinder (12). 12) Connected to the support ring plate (18), the output end of the first hydraulic cylinder (12) is connected to the filter block (13), the filter block (13) is provided with a filter plate (16) at the lower end, the filter plate (16) is connected to the filter cloth (15) and the support column (17) at the upper and lower ends respectively, the support column (17) is connected to the bottom plate (9), the lower end of the filter tube (14) is slidably connected to the discharge mechanism (2), and the support column (17) is provided with an overflow mechanism (5) on the outer ring; The overflow mechanism (5) includes an overflow plate (51), a V-groove (511), a scraper (52), and an arc-shaped piston telescopic rod (53). The overflow plate (51) is connected to the support column (17). The overflow plate (51) is conical, and a V-groove (511) is provided on the conical surface of the overflow plate (51).

2. The negative pressure sludge discharge device according to claim 1, characterized in that, The V-groove (511) is slidably connected to the symmetrically arranged scraper (52), the scraper (52) is connected to the output end of the arc-shaped piston telescopic rod (53), the arc-shaped piston telescopic rod (53) is connected to the cutting mechanism (4), and the bottom of the scraper (52) is connected to the blocking mechanism (54).

3. The negative pressure sludge discharge device according to claim 2, characterized in that, The blocking mechanism (54) includes a connecting rod (541), a first push rod (542), a second push rod (543), a pressure plate (544), a telescopic elastic element (545), and a support plate (546). The end of the connecting rod (541) is connected to the bottom of the scraper (52), and both ends of the connecting rod (541) are connected to the first push rod (542) and the second push rod (543) respectively. The ends of the first push rod (542) and the second push rod (543) are in transmission contact with the pressure plate (544), and the bottom of the pressure plate (544) is in contact with the extension rod (546). One end of the elastic member (545) is connected to the support plate (546), and the other end of the elastic member (545) is connected to the bottom of both ends of the support plate (546). The top of the pressure plate (544) is connected to the symmetrically arranged cylinder (549), and the top of the cylinder (549) is connected to the diversion channel block (547). A filter screen (548) is installed in the groove of the diversion channel block (547). The first push rod (542) and the second push rod (543) of the two connecting rods (541) are arranged alternately.

4. The negative pressure sludge discharge device according to claim 1, characterized in that, The discharge mechanism (2) includes a second hydraulic cylinder (21), a barrier ring plate (22), a third hydraulic cylinder (23), a push plate (24), and a leak-proof plate (25) arranged symmetrically. The second hydraulic cylinder (21) is connected to the inner wall of the support ring plate (18). The output end of the second hydraulic cylinder (21) is connected to a barrier ring plate (22). The barrier ring plate (22) is slidably connected to the filter pipe (14). The outer wall of the barrier ring plate (22) is provided with a push plate (24). The two ends of the push plate (24) are connected to one end of the symmetrically and horizontally arranged leak-proof plates (25). The two leak-proof plates (25) are connected by a support rod. The outer wall of the push plate (24) is connected to the output end of the second hydraulic cylinder (21). The second hydraulic cylinder (21) is connected to a semi-circular cover (8).

5. The negative pressure sludge discharge device according to claim 1, characterized in that, The cutting mechanism (4) includes a fourth hydraulic cylinder (41), a mud-pressing plate (42), a cutting plate (43), an inclined surface (431), and a cutting groove (432). The fourth hydraulic cylinder (41) is installed on the inner wall of the support ring plate (18). The output end of the fourth hydraulic cylinder (41) is connected to the mud-pressing plate (42). The lower end of the mud-pressing plate (42) is provided with a cutting plate (43), and the cutting plate (43) is connected to the filter plate (16).

6. The negative pressure sludge discharge device according to claim 5, characterized in that, The cutting plate (43) has a bevel (431) at its lower end, and the bevel (431) has multiple cutting grooves (432) at equal intervals.

7. The negative pressure sludge discharge device according to claim 1, characterized in that, A baffle plate (512) is fixedly connected to the top middle position of the overflow plate (51). A hollow rectangular groove is opened on the overflow plate (51) outside the baffle plate (512). A conveyor belt mechanism (7) is provided at the lower end of the rectangular groove.

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