A sludge discharging device for sewage treatment with an anti-flushing and anti-blocking structure

Abstract

The present invention discloses a sludge discharging device for sewage treatment with an anti-backwashing anti-blocking structure. Based on the traditional spiral propulsion sludge discharging principle, a horizontally arranged sludge discharging channel is provided at the bottom of the sludge collecting hopper, and horizontal spiral propulsion sludge discharging is carried out by relying on a spiral auger. Sewage filters out unobstructedly from a plurality of filter holes horizontally arranged at the bottom end of the sludge discharging pipe. Since the internal space of the sludge discharging pipe gradually shrinks towards the sludge discharging end, the extrusion pressure on the sludge increases during propulsion, realizing the gradual compression of the sludge during the efficient water filtration process, which is convenient for subsequent formed sludge discharging. In addition, the sludge discharging channel is set to be flip-up and down type. The sludge discharging channel is rotated regularly, and the upper and lower positions of the mud inlet and the filter holes are swapped. Multiple groups of backwashing nozzles are used to backwash the filter holes. Water flows into the sludge discharging channel and is effectively discharged obliquely downward towards the mud inlet side in the sludge discharging channel under the reverse driving of the spiral auger, cleaning the internal structure of the sludge discharging channel and preventing blockage.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to a sludge discharging device for sewage treatment with an anti-flushing and anti-blocking structure. Background Art

[0002] When a sewage treatment plant treats sewage, a large amount of sludge is generated every day. These sludges contain a large amount of easily decomposable organic matter, and it is necessary to filter and dehydrate the sludge in the sewage to reduce the sludge content rate in the sewage in order to recycle or discharge the filtered water.

[0003] After retrieval, the patent publication number CN118384606A discloses a sludge discharging device for rural sewage treatment. The screw conveyor plate rotates to drive sewage and sludge to enter the sedimentation tank downward. During the transportation of sewage, preliminary dry-wet separation is carried out through the leakage holes, and further sedimentation dry-wet separation is carried out through the filter holes. By starting the second servo motor, the screw rotates in the extrusion column, and then the dry-wet separated sludge is pushed into the compression cylinder, and the slide plate is pushed to compress the compression spring. As the extrusion column squeezes the sludge, the sludge is compressed into blocks.

[0004] Although this patent can filter and compress sludge during the sludge discharging process, and a number of leakage holes are provided on the screw conveyor plate for the purpose of separating mud and water, since the screw conveyor plate is vertically arranged, the water separated from the upper part still flows into the lower part, resulting in a general sludge separation effect at the bottom. In addition, after the screw conveyor plate is used for a period of time, the sludge is likely to block the leakage holes and cover the end face of the screw conveyor plate, reducing the conveying distance of the screw conveyor plate and affecting the sludge discharging efficiency. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of poor mud-water separation effect and easy blockage in the existing sludge discharging structure, and now provides a sludge discharging device for sewage treatment with an anti-flushing and anti-blocking structure.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A sludge discharging device for sewage treatment with an anti-flushing and anti-blocking structure, a sedimentation tank with a sludge collecting hopper at the bottom, a sludge discharging groove is opened at the bottom of the sludge collecting hopper, a support is fixed on one side of the bottom of the sludge collecting hopper, and a sludge inlet pipe passing through the support and extending into the sludge discharging groove is rotationally driven on the support. The other end of the sludge inlet pipe extends outward and is fixedly connected and communicated with a sludge discharging pipe. The sludge discharging pipe is a conical structure with an inner diameter gradually decreasing along its outward extending direction. The inner end of the sludge discharging pipe is connected and communicated with the sludge inlet pipe through a conical pipe. The sludge inlet pipe, the conical pipe and the sludge discharging pipe form a sludge discharging channel with an inner diameter gradually decreasing outward.

[0007] The upper end wall of the mud inlet pipe is provided with a mud inlet that is connected and docked with the top of the mud discharge groove. A mud discharge conveying assembly that extends to the mud discharge port at the end of the mud discharge pipe is rotatably installed inside the mud inlet pipe. The bottom end wall of the mud discharge pipe is provided with a plurality of filter holes;

[0008] On the other side of the bottom of the mud collecting hopper, a flushing box sleeved on the upper end of the mud discharge pipe is fixed. A flushing cavity connected to the outer wall of the mud discharge pipe is provided inside the flushing box. Along the extending direction of the mud discharge pipe, a plurality of groups of backwashing nozzles are arranged at the top end of the flushing box. The plurality of groups of backwashing nozzles are commonly externally connected to a water inlet pipe.

[0009] Further, the mud discharge conveying assembly includes a spiral shaft rotatably installed on a bracket. The other end of the spiral shaft penetrates through the mud discharge channel and extends to the mud discharge port. A spiral auger adapted to the inner wall of the mud discharge channel is fixedly sleeved on the outer end wall of the spiral shaft.

[0010] Further, a plurality of stirring blades are annularly distributed on the end wall of the spiral shaft inside the mud inlet pipe. The plurality of stirring blades are fixed on the spiral auger and extend to the conical pipe. A mud discharge gap is reserved between the stirring blades and the conical pipe.

[0011] Further, a rotary cutting knife located at the mud discharge port at the end of the mud discharge pipe is fixedly installed at the outermost end of the spiral shaft.

[0012] Further, a liquid discharge channel sleeved on the lower end of the mud discharge pipe is fixed on the end wall of the mud collecting hopper away from the bracket. The upper end of the liquid discharge channel is oppositely connected to the lower end of the flushing box.

[0013] Further, the inner end of the liquid discharge channel is connected and communicated with the bottom end of the mud discharge groove. The lower part of the outer end of the liquid discharge channel is connected and communicated with the sedimentation tank through a return pipe.

[0014] Further, a mud pressing assembly that is oppositely connected to the mud discharge port at the end of the mud discharge pipe is fixed to the outer end of the flushing box through a connecting piece.

[0015] Further, the mud pressing assembly includes a fixed cylinder base fixed at the outer end of the flushing box. An upper die sleeve that is coaxially arranged with the mud discharge pipe and is oppositely connected to the end of the mud discharge pipe is fixed at the end of the fixed cylinder base. A lower die sleeve that is also oppositely connected to the end wall of the mud discharge pipe is horizontally pushed and installed on the fixed cylinder base through a linear telescopic rod. The two sides of the upper end of the lower die sleeve are respectively slidably connected to the two side end walls of the lower end of the upper die sleeve.

[0016] Further, a compression cavity is formed between the lower die sleeve and the upper die sleeve. A pressure sensor is embedded and installed on the inner end wall of the compression cavity.

[0017] Further, a mud collecting bin located below the upper die sleeve is placed on one side of the sedimentation tank. A mud discharge slideway with an upper end extending below the compression cavity is fixed on one side of the edge of the mud collecting bin.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] This solution is based on the traditional principle of screw propulsion for sludge discharge. A horizontal sludge discharge channel composed of a sludge inlet pipe and a sludge discharge pipe is arranged at the bottom of the sludge collecting hopper. The sludge is discharged in a horizontal screw propulsion manner by relying on a rotating screw auger. The sewage filters out from multiple filter holes on the bottom end surface of the sludge discharge pipe. Since the internal space of the sludge discharge pipe gradually narrows towards the sludge discharge port, the extrusion pressure on the sludge caused by the screw propulsion increases, realizing the step-by-step compression of the sludge during the efficient water filtration process. Cooperating with the sludge pressing component installed at the sludge discharge port of the sludge discharge pipe, it is convenient for subsequent formed sludge discharge;

[0020] The sludge discharge channel is set to be flip-up and down type. The sludge discharge channel is rotated regularly, and the upper and lower positions of the sludge inlet and the filter holes are swapped. Multiple groups of backflush spray pipes are used to backflush the filter holes. The pulsed water flow enters the sludge discharge channel through the filter holes. Driven by the reverse rotation of the screw auger, the sewage in the sludge discharge channel is effectively conveyed obliquely downward towards the sludge inlet side, effectively cleaning the sludge on the sludge discharge conveying component and the end wall of the sludge discharge channel, preventing the sludge discharge channel from being blocked. The cleaning sewage finally enters the liquid discharge channel through the sludge inlet and the sludge discharge groove, and is pumped back to the sedimentation tank by the return pipe for cyclic treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the external structure of the present invention;

[0022] Figure 2 is a sectional view of the present invention during the sludge discharge operation;

[0023] Figure 3 is a schematic diagram of the structure at the junction of the sludge discharge channel, the flushing box, the liquid discharge channel and the sludge pressing component of the present invention;

[0024] Figure 4 is a schematic diagram of the structure at the junction of the sludge discharge channel and the sludge pressing component of the present invention;

[0025] Figure 5 is a sectional view of the sludge discharge channel of the present invention;

[0026] Figure 6 is a schematic diagram of the structure of the sludge discharge conveying component of the present invention;

[0027] Figure 7 is a schematic diagram of the structure of the sludge pressing component of the present invention;

[0028] Figure 8 is a partial sectional view of the sludge pressing component of the present invention;

[0029] Figure 9 is a schematic diagram of the structure of the present invention during the backflush operation.

[0030] Explanation of the reference numerals in the drawings:

[0031] 1. Sedimentation tank; 101. Mud collecting hopper; 102. Mud discharging trough; 2. Inlet mud pipe; 201. Inlet mud port; 3. Mud discharging pipe; 301. Filter holes; 4. Screw auger; 5. Driving motor I; 6. Screw shaft; 7. Stirring blades; 8. Rotary cutting knife; 9. Mud pressing assembly, 91. Fixed cylinder seat; 92. Upper die sleeve; 93. Lower die sleeve; 94. Linear telescopic rod; 95. Pressure sensor; 10. Drainage channel; 11. Return pipe; 12. Flushing tank; 13. Backwashing spray pipe; 14. Water inlet pipe; 15. Driving motor II; 16. Transmission gear. Specific embodiments

[0032] The following will combine the accompanying drawings in the embodiments of the present invention; clearly and completely describe the technical solutions 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 scope of protection of the present invention. Embodiment 1

[0033] In view of the poor effect of mud-water separation in the vertical mud discharging structure of the screw auger in the prior art and the easy blockage caused by the sludge covering the auger plate, the following technical solutions are proposed:

[0034] The present invention discloses a mud discharging device for sewage treatment with an anti-backwashing and anti-blocking structure. Please refer to Figure 1 、 Figure 2 , including a sedimentation tank 1 with a mud collecting hopper 101 at the bottom. Drainage slopes inclined downward towards the mud collecting hopper 101 are provided on both sides of the bottom end of the sedimentation tank 1. A plurality of groups of sewage inlet pipes adjacent to the upper ends of the drainage slopes are embedded and installed on both the left and right sides of the sedimentation tank 1. The mud collecting hopper 101 extends downward.

[0035] A plurality of sewage inlet pipes are distributed at the upper ends of the drainage slopes on both sides of the bottom end of the sedimentation tank 1. Sewage is discharged into the sedimentation tank 1 through the sewage inlet pipes. The sewage impacts the drainage slope downward and flows back upward at the middle position of the sedimentation tank 1. In this design, during the sewage discharge process, the suspended solids in the sewage precipitate into the mud collecting hopper 101 under the action of gravity to form sludge, avoiding the sludge from precipitating at both sides of the bottom end of the sedimentation tank 1 and effectively promoting the concentration of sludge in the mud collecting hopper 101.

[0036] Please refer to Figures 2-3, a sludge collecting hopper 101 is provided with a sludge discharge groove 102 at the bottom. One side of the bottom of the sludge collecting hopper 101 is fixed with a bracket, and a sludge inlet pipe 2 penetrating into the sludge discharge groove 102 is rotatably driven on the bracket. The other end of the sludge inlet pipe 2 extends outward and is fixedly connected and communicated with a sludge discharge pipe 3. One end of the sludge inlet pipe 2 far from the sludge discharge pipe 3 is rotatably installed on the bracket through a rotating shaft, and a second driving motor 15 for rotating and driving the rotating shaft is installed on the bracket. Transmission gears 16 that are meshed and connected to each other are fixed on both the driving end of the second driving motor 15 and the end wall of the rotating shaft, and the up-and-down flipping design of the sludge discharge channel is realized through an external driving mechanism.

[0037] Please refer to Figures 2-6 , the sludge discharge pipe 3 is a conical structure with an inner diameter gradually decreasing along its outward extension direction. The inner end of the sludge discharge pipe 3 is connected and communicated with the sludge inlet pipe 2 through a conical pipe. The sludge inlet pipe 2, the conical pipe, and the sludge discharge pipe 3 form a sludge discharge channel with an inner diameter gradually shrinking outward. The upper end wall of the sludge inlet pipe 2 is provided with a sludge inlet 201 connected and butted with the top of the sludge discharge groove 102. A sludge discharge conveying assembly extending to the outer end of the sludge discharge pipe 3 is rotatably installed inside the sludge inlet pipe 2. A first driving motor 5 for rotating and driving the sludge discharge conveying assembly is fixed at the outer end of the rotating shaft. A plurality of filter holes 301 are provided on the bottom end wall of the sludge discharge pipe 3;

[0038] The sludge discharge conveying assembly includes a spiral shaft 6 rotatably installed on the bracket. The other end of the spiral shaft 6 penetrates through the sludge discharge channel and extends to the sludge discharge port. A spiral auger 4 adapted to the inner wall of the sludge discharge channel is fixedly sleeved on the outer end wall of the spiral shaft 6. The outer diameter of the spiral auger 4 gradually increases from the sludge discharge pipe 3 to the side of the sludge inlet pipe 2, and the outer end wall of the spiral auger 4 located inside the sludge discharge pipe 3 is movably attached to the inner wall of the sludge discharge pipe 3;

[0039] The end wall of the sludge collecting hopper 101 far from the bracket is fixed with a liquid discharge channel 10 sleeved on the lower end of the sludge discharge pipe 3 and connected and communicated with the bottom end of the sludge discharge groove 102. A communication port connected to the liquid discharge channel 10 is provided on one side of the bottom end of the sludge discharge groove 102. The bottom surface of the liquid discharge channel 10 is inclined downward outward along the communication port. One side of the bottom end of the liquid discharge channel 10 is connected and communicated with the sedimentation tank 1 through a return pipe 11. A pump for driving the return pipe 11 is provided on the rear end wall of the liquid discharge channel 10.

[0040] In the initial stage of sewage discharge and sedimentation, the sludge inlet 201 is arranged downward, and the other end surface of the sludge inlet pipe 2 is sealed at the top of the sludge discharge groove 102, which is convenient for the sewage to be discharged and left still. After the supernatant of the sedimentation tank 1 is pumped out subsequently, the sludge precipitates in the sludge collecting hopper 101. At this time, the sludge discharge channel is rotated in the reverse direction until the sludge inlet 201 is connected and communicated with the upper end of the sludge discharge groove 102;

[0041] Start the sludge conveying component and use the rotation of the spiral auger 4 to spirally propel the sludge toward the sludge discharge port outside the sludge discharge pipe 3. The spiral auger 4 adapts to the internal structure design of the sludge discharge pipe 3. During the conveying process, the internal space of the sludge discharge pipe 3 gradually shrinks, and the squeezing force of the spiral propulsion is greater, which not only improves the water filtration effect, but also gradually compresses the sludge, thus doing preliminary work for the subsequent compression molding of the sludge.

[0042] In addition, a plurality of stirring blades 7 are distributed in an annular manner on the end wall of the spiral shaft 6 located on the inner side of the mud inlet pipe 2. The plurality of stirring blades 7 are fixed on the spiral auger 4 and extend to the conical tube. The outer wall of the stirring blade 7 is movably arranged with the inner wall of the mud inlet pipe 2, and a mud discharge gap is reserved between the stirring blade 7 and the conical tube. A plurality of stirring blades 7 that rotate synchronously with the spiral shaft 6 are added on the inner side of the mud inlet pipe 2. The outer diameter of the stirring blade 7 is matched with the inner diameter of the mud inlet pipe 2. After the mud inlet port 201 is flipped upward, the spiral auger 4 and the stirring blade 7 are exposed. The stirring blade 7 located at the top extends to the outside of the mud inlet port 201. During the rotation of the plurality of stirring blades 7, the sludge at the bottom of the mud collecting bucket 101 is effectively flipped and stirred, which is beneficial for the sludge to enter the mud inlet pipe 2 through the mud inlet port 201, and a mud discharge gap is reserved between the stirring blade 7 and the conical tube to avoid affecting the mud discharge progress due to the setting of the stirring blade 7.

[0043] See also Figure 9 A flushing box 12 is fixed at the upper end of the discharge channel 10 and is sleeved on the upper end of the mud discharge pipe 3. A flushing cavity connected to the outer wall of the mud discharge pipe 3 is opened in the flushing box 12. A plurality of groups of recoil nozzles 13 are arranged horizontally at the top end of the flushing box 12. The plurality of recoil nozzles 13 are connected to a water inlet pipe 14, and a pulse valve is installed on the water inlet pipe 14.

[0044] The mud discharge channel is set to be upside down and down, which not only realizes the intermittent switching between sewage discharge and mud discharge, but also rotates the mud discharge channel during the non-mud discharge process, and the mud inlet 201 and the filter hole 301 are swapped up and down, and the upper end of the mud discharge groove 102 is blocked by the sealing surface of the mud inlet pipe 2. At this time, the mud inlet 201 is downwardly connected to the bottom of the mud discharge groove 102, and the filter hole 301 is rotated upward to the inside of the flushing box 12. The two sides of the bottom of the flushing cavity are just connected with the two sides of the edge of the filter hole 301 that rotates upward, so that when multiple recoil nozzles 13 are started, pulse water flows into multiple filter holes 301 to reduce the residual water in the flushing cavity;

[0045] A plurality of backwash nozzles 13 are used to backwash the filter holes 301, and pulsed water flows through the plurality of filter holes 301 into the mud discharge channel. On the one hand, the filter holes 301 are punched and cleaned, and on the other hand, the spiral auger 4 is driven in reverse to rotate during the backwashing process. Since the mud discharge pipe 3 is a conical structure, the sewage in the mud discharge channel is effectively tilted downward and transported toward the mud inlet 201, which is convenient for spiral transportation of sewage. The water flow effectively cleans the mud discharge conveying component and the sludge on the end wall of the mud discharge channel to prevent the mud discharge channel from being blocked. The clean sewage is finally discharged into the discharge channel 10 through the mud inlet 201 and the mud discharge trough 102. The inner bottom wall of the liquid discharge channel 10 and the inner bottom wall of the mud discharge trough 102 are arranged as an inclined surface tilted downward toward one end of the return pipe 11, so that the clean sewage is pumped from the return pipe 11 to the sedimentation tank 1 for circulation treatment. Example 2

[0046] On the basis of Example 1, this embodiment adds a mud pressing assembly 9 at the mud discharge port of the mud discharge channel and a rotary cutter 8 that rotates synchronously with the mud inlet pipe 2 is provided at the outer end of the mud inlet pipe 2, which is conducive to compressing the sludge discharged from the mud discharge port and discharging it intermittently. The specific structure and process are as follows:

[0047] See also Figures 1-2 as well as Figures 7-8 A mud pressing assembly 9 connected to the end of the mud discharge pipe 3 is fixed at the outer end of the flushing box 12, and a rotary cutter 8 is fixed on the end wall of the spiral shaft 6 located at the end of the mud discharge pipe 3. The mud pressing assembly 9 includes a fixed cylinder seat 91 fixed at the outer end of the flushing box 12, and an upper die sleeve 92 coaxially arranged with the mud discharge pipe 3 and connected to the end of the mud discharge pipe 3 is fixed at the end of the fixed cylinder seat 91. A lower die sleeve 93 connected to the end wall of the mud discharge pipe 3 is also installed on the fixed cylinder seat 91 through a linear telescopic rod 94 to push horizontally, and the two sides of the upper end of the lower die sleeve 93 are respectively slidably connected with the two side end walls of the lower end of the upper die sleeve 92;

[0048] A compression chamber is formed between the lower die sleeve 93 and the upper die sleeve 92, and a pressure sensor 95 is embedded in the inner end wall of the compression chamber. The sludge is filtered and initially compressed through the cooperation of the sludge discharge channel and the sludge discharge conveying assembly. The sludge discharged from the end of the sludge discharge pipe 3 enters the compression chamber formed by the upper die sleeve 92 and the lower die sleeve 93, and the sludge is continuously pushed into the compression chamber. The sludge is squeezed and the force is transmitted to the pressure sensor 95. When the squeezing force reaches the preset pressure value, the linear telescopic rod 94 is started at this time. The linear telescopic rod 94 quickly pushes the lower die sleeve 93 toward the inside of the fixed cylinder seat 91, completely exposing the lower end of the upper die sleeve 92, and the formed sludge forming column falls out of the compression chamber under the cutting action of the rotary cutter 8.

[0049] On one side of the sedimentation tank 1, there is a sludge collection bin located below the upper die sleeve 92. On one side of the edge of the sludge collection bin, there is a sludge discharge chute extending upward to below the compression cavity. The sludge forming column that has separated from the compression cavity is discharged into the sludge collection bin through the sludge discharge chute. Only by relying on the single upper die sleeve 92 and the lower die sleeve 93 that can quickly expand and contract left and right can the sludge be compressed and formed and intermittently discharged.

[0050] To sum up: Based on the traditional screw propulsion sludge discharge principle, the sludge discharge structure and the sludge discharge action are improved. Specifically: By setting a combination of a sludge inlet pipe 2 and a sludge discharge pipe 3 at the bottom of the sludge collection hopper 101 to form a sludge discharge channel extending horizontally outward, and arranging a sludge discharge conveying component in the sludge discharge channel. During the horizontal screw propulsion sludge discharge process, the sewage filters out unobstructedly from a plurality of filter holes 301 horizontally arranged on the bottom end surface of the sludge discharge pipe 3, realizing efficient and continuous water filtration while the sludge is being conveyed, and because the internal space of the sludge discharge pipe 3 gradually shrinks outward, the greater the extrusion force of the screw propulsion on the sludge during the continuous outward conveyance process, which not only improves the water filtration effect but also compresses the sludge, facilitating the subsequent compression and discharge of the sludge;

[0051] When regular anti-blocking cleaning is required, only need to turn the sludge discharge channel upside down. At this time, the sludge inlet 201 is arranged downward to block the bottom of the sludge collection hopper 101, while the filter holes 301 are rotated upward to the inside of the flushing box 12, and multiple groups of backflush nozzles 13 are used to perform backflushing on the filter holes 301. The flushing water enters the sludge discharge channel through the filter holes 301, and the screw auger 4 is rotated in the reverse direction. Based on the conical setting of the sludge discharge pipe 3, the sewage in the sludge discharge channel is effectively conveyed obliquely downward toward the sludge inlet 201 side. During the screw conveyance process, the sludge discharge conveying component scrapes the inner wall of the sludge discharge channel, and using the impact of the water flow, the sludge on the sludge discharge conveying component and the end wall of the sludge discharge channel is effectively cleaned. The cleaning sewage then enters the liquid discharge channel 10 through the sludge inlet 201 and the sludge discharge groove 102, and is pumped back to the sedimentation tank 1 through the return pipe 11 for cyclic treatment.

[0052] The above; is only the preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any person skilled in the art within the technical scope disclosed by the present invention; according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes; should be covered by the protection scope of the present invention.

Claims

1. A sludge discharging device for sewage treatment with an anti-backwashing and anti-blocking structure, comprising a sedimentation tank (1) with a sludge hopper (101) at the bottom, characterized in that: The bottom of the sludge sump (101) is provided with a sludge discharge groove (102). A support is fixed on one side of the bottom of the sludge sump (101), and a sludge inlet pipe (2) that penetrates into the sludge discharge groove (102) is rotatably driven on the support. The other end of the sludge inlet pipe (2) extends outward and is fixedly connected and communicated with a sludge discharge pipe (3). The sludge discharge pipe (3) is a conical structure with an inner diameter gradually decreasing outward. The inner end of the sludge discharge pipe (3) is connected and communicated with the sludge inlet pipe (2) through a conical pipe. The sludge inlet pipe (2), the conical pipe, and the sludge discharge pipe (3) form a sludge discharge channel with an inner diameter gradually shrinking outward; The upper end wall of the sludge inlet pipe (2) is provided with a sludge inlet (201) that is connected and docked with the top of the sludge discharge groove (102). A sludge discharge conveying assembly that extends to the sludge discharge port at the end of the sludge discharge channel is rotatably installed inside the sludge inlet pipe (2). A plurality of filter holes (301) are provided on the bottom end wall of the sludge discharge pipe (3). The sludge discharge conveying assembly includes a spiral shaft (6) rotatably installed on the support. The other end of the spiral shaft (6) penetrates through the sludge discharge channel and extends to the sludge discharge port. A spiral auger (4) that is adapted to the inner wall of the sludge discharge channel is fixedly sleeved on the outer end wall of the spiral shaft (6); On the other side of the bottom of the sludge sump (101), a flushing box (12) sleeved on the upper end of the sludge discharge pipe (3) is fixed. A flushing cavity connected to the outer wall of the sludge discharge pipe (3) is provided inside the flushing box (12). A plurality of groups of backwashing nozzles (13) are arranged along the extending direction of the sludge discharge pipe (3) at the top end of the flushing box (12). The plurality of groups of backwashing nozzles (13) are commonly externally connected to a water inlet pipe (14); On the end wall of the sludge sump (101) away from the support, a liquid discharge channel (10) sleeved on the lower end of the sludge discharge pipe (3) is fixed. The upper end of the liquid discharge channel (10) is arranged in butt joint with the lower end of the flushing box (12). The inner end of the liquid discharge channel (10) is connected and communicated with the bottom end of the sludge discharge groove (102). The lower part of the outer end of the liquid discharge channel (10) is connected and communicated with the sedimentation tank (1) through a return pipe (11); The outermost end of the spiral shaft (6) is fixedly installed with a rotary cutting knife (8) located at the sludge discharge port at the end of the sludge discharge pipe (3). A sludge pressing assembly (9) that is connected and docked with the sludge discharge port at the end of the sludge discharge pipe (3) is fixed to the outer end of the flushing box (12) through a connecting piece. The sludge pressing assembly (9) includes a fixed cylinder base (91) fixed at the outer end of the flushing box (12). A upper die sleeve (92) that is coaxially arranged with the sludge discharge pipe (3) and is connected and docked with the end of the sludge discharge pipe (3) is fixed at the end of the fixed cylinder base (91). A lower die sleeve (93) that is also connected and docked with the end wall of the sludge discharge pipe (3) is horizontally pushed and installed on the fixed cylinder base (91) through a linear expansion and contraction rod (94). The two sides of the upper end of the lower die sleeve (93) are respectively slidably connected with the two side end walls of the lower end of the upper die sleeve (92). A cylindrical compression cavity is formed between the lower die sleeve (93) and the upper die sleeve (92). A pressure sensor (95) is embedded and installed on the inner end wall of the compression cavity.

2. The sludge discharging device for sewage treatment with an anti-backwashing and anti-blocking structure according to claim 1, characterized in that: A plurality of stirring vanes (7) are annularly distributed on the end wall of the spiral shaft (6) located inside the mud inlet pipe (2). The plurality of stirring vanes (7) are fixed on the spiral auger (4) and extend to the conical pipe, and a mud discharge gap is reserved between the stirring vane (7) and the conical pipe.

3. A sludge discharging device for sewage treatment with an anti-flushing and anti-blocking structure according to claim 1, characterized in that: A mud collecting bin located below the upper die sleeve (92) is placed on one side of the sedimentation tank (1), and a mud discharge chute extending upward to below the compression cavity is fixed on one side of the edge of the mud collecting bin.

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