A sludge screening device and its screening method

Abstract

The present invention belongs to the technical field of sludge treatment, and particularly relates to a sludge screening device and a screening method thereof. The sludge screening device includes a drum screen, a sand washer, and a sediment sewage separation device. The drum screen is used for screening the sediment mixture collected from the river channel to remove large-particle impurities in the sediment mixture; the sand washer is used for cleaning the sediment mixture after the large-particle impurities are removed by the drum screen to wash the sludge on the surface of the sand; the sediment sewage separation device is used for separating the sediment sewage in the sand washer. The sediment sewage separation device includes a chemical pretreatment component for flocculating the sludge in the sediment sewage, and also includes a frame and a conveyor belt arranged on the frame, a gravity dewatering component, a wedge preloading component, and a high-pressure extrusion component with the dewatering intensity increasing sequentially along the conveying direction of the conveyor belt. It can improve the efficiency of sediment-water separation, and the separation quality can also be guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of sludge treatment, and particularly relates to a sludge screening device and a screening method thereof. Background Art

[0002] With the precipitation of sludge in the river water, a large amount of silt will accumulate at the bottom and side walls of the river channel, which needs to be cleaned regularly. The existing cleaning methods mainly scrape the silt at the bottom and inner side walls of the river channel through a sludge suction machine or scraping. There are a large amount of sand and gravel in the scraped silt, and screening out the sand in the sludge will bring good benefits.

[0003] Currently, for the screening of river channel sludge, it usually includes processes such as sludge collection, debris screening, sand washing, and mud dewatering and solid-liquid separation. Currently, the mud dewatering and solid-liquid separation process usually uses a sludge screening device, which is a production line type and at least includes the integration of multiple devices. For example, a drum screen corresponds to the debris screening process, a sand washer corresponds to the sand washing process, and a sediment and sewage separation device corresponds to the mud dewatering and solid-liquid separation process.

[0004] Currently, the sediment and sewage separation device usually uses a sedimentation tank for solid-liquid separation, but this method has low efficiency and poor separation quality. Summary of the Invention

[0005] The purpose of the present invention is to provide a sludge screening device and a screening method thereof for the above-mentioned existing technical problems, achieving the effects of improving the efficiency of solid-liquid separation and ensuring the separation quality.

[0006] In view of this, the present invention provides a sludge screening device, including:

[0007] A drum screen, which is used to screen the sediment mixture collected from the river channel and screen out large-particle debris in the sediment mixture;

[0008] A sand washer, which is used to wash the sediment mixture after the large-particle debris is screened out by the drum screen and wash off the sludge on the surface of the sand;

[0009] A sediment and sewage separation device, which is used to separate the sediment and sewage in the sand washer. The sediment and sewage separation device includes a chemical pretreatment component, which is used to flocculate the sludge in the sediment and sewage, and also includes a frame and a conveyor belt arranged on the frame, a gravity dewatering component, a wedge pre-pressing component, and a high-pressure extrusion component with gradually increasing dehydration intensity along the conveying direction of the conveyor belt.

[0010] In this technical solution, the sediment mixture collected from the river channel enters a drum screen for screening. Large-particle debris remains on the filter screen and is discharged from the outlet of the drum screen. The remaining sediment mixture passes through the filter screen and falls into the receiving box below, then slides into the feed trough of a sand washer. The sand washer is a wheel-type sand washer. The sediment mixture tumbles and grinds against each other under the drive of the impeller, thereby removing the sludge on the surface of the sand. Then, the washed sand falls from the outlet side of the sand washer, while the sludge remains in the sewage in the feed trough. The sewage in the sand washer needs to be replaced after a certain period of time and cannot be directly discharged. It needs to be subjected to sediment-water separation treatment. First, it undergoes chemical pretreatment through a chemical pretreatment component. The sewage is pumped into a reaction cylinder, and a flocculant such as polyaluminum chloride is added to the reaction cylinder to flocculate the sludge in the sediment-water mixture. Then, it is discharged onto the conveyor belt of the sediment-sewage separation device. As the conveyor belt transports it, the sediment-water mixture successively passes through a gravity dewatering component, a wedge pre-pressing component, and a high-pressure extrusion component for sediment-water separation. Finally, the sludge is dehydrated into a cake and discharged from the sediment-sewage separation device, and the sewage also meets the discharge requirements. The sediment-sewage separation device has a gravity dewatering component, a wedge pre-pressing component, and a high-pressure extrusion component with gradually increasing dehydration intensities, which can improve the sediment-water separation efficiency and ensure the separation quality.

[0011] Further, the wedge pre-pressing component includes:

[0012] A first mounting frame, which is fixedly arranged on the frame and spans across the conveyor belt;

[0013] Extrusion plates. A plurality of extrusion plates are provided. An extrusion channel is formed between two adjacent extrusion plates arranged in a "V" shape. Along the conveying direction of the conveyor belt, the width of the extrusion channel gradually decreases.

[0014] In this technical solution, after the sediment-water mixture is dewatered by the gravity dewatering component, it is transported to the extrusion channel along with the conveyor belt. Due to the gradually decreasing width of the extrusion channel, it can play a role in extruding the sediment-water mixture.

[0015] Further, along the conveying direction of the conveyor belt, at least two sets of wedge pre-pressing components are arranged front and back. The extrusion plates of the front and back two sets of wedge pre-pressing components are staggered with each other in the direction perpendicular to the conveying direction of the conveyor belt.

[0016] In this technical solution, the staggered arrangement can enable part of the sediment-water mixture coming out of the non-extrusion channel of the previous set of wedge pre-pressing components to enter the extrusion channel of the next set of wedge pre-pressing components, so that part of the sediment-water mixture that has not been extruded can also be extruded and dehydrated.

[0017] Further, the conveyor belt includes a first conveyor belt and a second conveyor belt. The first conveyor belt is located below the wedge pre-pressing assembly. The first conveyor belt and the second conveyor belt gradually approach each other on one side of the frame and gradually move away from each other on the other side of the frame. The high-pressure extrusion assembly includes:

[0018] Extrusion rollers, multiple extrusion rollers are arranged along the common transmission path of the first conveyor belt and the second conveyor belt, and the diameter of the extrusion rollers gradually decreases along the transmission direction of the conveyor belt. The second conveyor belt is tensioned on the surface of the extrusion rollers, and the first conveyor belt is tensioned on the side of the second conveyor belt away from the extrusion rollers;

[0019] Liquid receiving trays, the liquid receiving trays are arranged below each extrusion roller for receiving the extruded moisture.

[0020] In this technical solution, the muddy water mixture continues to be transported on the first conveyor belt after being dewatered by the gravity dewatering assembly and the wedge pre-pressing assembly, falls to the second conveyor belt at the corner, and the muddy water mixture is transported between the first conveyor belt and the second conveyor belt through each extrusion roller, and the moisture in the muddy water mixture can be extruded out. The moisture falls into the liquid receiving tray, and the mud cake with the moisture extruded out falls from the other side of the frame where the first conveyor belt and the second conveyor belt gradually move away.

[0021] Further, a kneading assembly is correspondingly arranged for the wedge pre-pressing assembly, and the kneading assembly is used for kneading the muddy water mixture passing through the extrusion channel.

[0022] In this technical solution, the kneading assembly can increase the water discharge efficiency when the muddy water mixture passes through the wedge pre-pressing assembly.

[0023] Further, the kneading assembly includes:

[0024] Kneading plates, there are two kneading plates in total, and the two kneading plates are respectively slidably arranged on the two extrusion plates forming the extrusion channel;

[0025] A second mounting frame, the second mounting frame is fixedly arranged on the frame and spans the conveyor belt in parallel with the first mounting frame. A turntable is rotatably arranged on the second mounting frame, and a fixing pin is arranged at a non-central position on the end face of the turntable facing the kneading plate;

[0026] Drive rods, each kneading plate corresponds to a drive rod and a turntable. One end of the drive rod is rotatably connected to the upper end of the kneading plate, and the other end is sleeved on the fixing pin of the turntable and rotatably connected to the positioning pin;

[0027] A power assembly, the power assembly is used to drive the turntables to rotate in the same direction and synchronously. The positions of the fixing pins on the two turntables corresponding to the two kneading plates in each extrusion channel are always centrosymmetric about the midpoint of the center line connecting the centers of the two turntables.

[0028] In the present technical solution, the power component drives the two turntables corresponding to the extrusion channel to rotate synchronously in the same direction, so that the movement of the positioning pin drives the movement of the driving rod, thereby driving the kneading plate to slide back and forth on the extrusion plate, and the kneading plates on the two extrusion plates are always in an offset sliding mode with opposite sliding directions, forming a kneading action on the mud and water mixture transported forward in the extrusion channel. On the one hand, it can promote the extrusion and discharge of water, and on the other hand, it can prevent the blockage of the mud and water mixture at the "eight"-shaped small head end of the extrusion channel, so that the wedge-shaped preloading component can operate efficiently and reliably.

[0029] Furthermore, each extrusion channel is correspondingly provided with a group of the above-mentioned kneading components, and one end of the rotating disk of each kneading component away from the fixed pin is fixedly connected to a transmission gear, and all the kneading components share the same power component, which includes:

[0030] A driving motor, wherein the driving motor is fixedly mounted on the second mounting frame, and an output gear is disposed at an output end of the driving motor;

[0031] A driven gear, the driven gear is coaxially fixedly connected to one of the rotating disks;

[0032] The toothed belt is tensioned by a sleeve on the outside of the transmission gears corresponding to all the turntables, and the toothed belt is meshed with the transmission gears.

[0033] In the present technical solution, the driving motor is started, driving the output gear and the driven gear to rotate, thereby causing one of the turntables connected to the driven gear to rotate, and the transmission gear corresponding to the turntable also rotates circumferentially, and the circumferential rotational motion is transmitted to each transmission gear through the toothed belt, thereby causing the turntable of each kneading component to rotate, and causing the kneading plate in each extrusion channel to perform a kneading action.

[0034] Furthermore, a protrusion is provided on the side of the kneading plate away from the squeezing plate.

[0035] In the technical solution, the protrusions are similar to rakes, which can drive more mud-water mixture to move during the sliding process of the kneading board, thereby increasing the kneading depth.

[0036] Furthermore, a rubber belt is provided at one end of the extrusion plate toward which the mud-water mixture is transmitted. The rubber belt is elastic, one end of the rubber belt is fixedly connected to the end of the extrusion plate away from the kneading plate, the rubber belt bypasses the end of the extrusion plate and the other end is fixedly connected to the end of the kneading plate.

[0037] In the technical solution, the rubber belt can prevent the mud-water mixture from entering the gap between the squeezing plate and the kneading plate, thereby ensuring the smooth sliding of the kneading plate.

[0038] Further, the screening method comprises the following steps:

[0039] S1: Remove impurities. The sediment mixture collected from the river channel enters a drum screen for screening. The drum screen removes large particle impurities to obtain a sediment mixture.

[0040] S2: Wash sand. The sediment mixture enters a wheel sand washer to wash the sand to remove the sludge on the surface of the sand, obtaining sand and a mud-water mixture.

[0041] S3: Mud dewatering and solid-liquid separation. The mud-water mixture obtained in S2 is chemically pretreated through a chemical pretreatment component to flocculate the sludge in the mud-water mixture, and then discharged onto the conveyor belt of the sediment sewage separation device. As the conveyor belt transports, the mud-water mixture sequentially passes through a gravity dewatering component, a wedge pre-pressing component, and a high-pressure extrusion component for solid-liquid separation. Finally, the sludge is dehydrated into a mud cake and discharged from the sediment sewage separation device. During the pre-pressing of the mud-water mixture through the wedge pre-pressing component, it is kneaded by a kneading component.

[0042] The beneficial effects of the present invention are:

[0043] 1. The sediment sewage separation device has a gravity dewatering component, a wedge pre-pressing component, and a high-pressure extrusion component with gradually increasing dehydration intensities, which can improve the solid-liquid separation efficiency and ensure the separation quality.

[0044] 2. After the mud-water mixture is dehydrated by the gravity dewatering component, it is transported to the extrusion channel along with the conveyor belt. Since the width of the extrusion channel gradually decreases, it can play a role in extruding the mud-water mixture. The staggered arrangement of multiple groups of wedge pre-pressing components can enable part of the mud-water mixture coming out of the non-extrusion channel of the previous group of wedge pre-pressing components to enter the extrusion channel of the next group of wedge pre-pressing components, so that part of the mud-water mixture that has not been extruded can also be extruded and dehydrated.

[0045] 3. Through the kneading component, a kneading action on the mud-water mixture transported forward in the extrusion channel can be formed. On the one hand, it can promote the extrusion and discharge of water, and on the other hand, it can prevent the blockage of the mud-water mixture at the "V"-shaped small head end of the extrusion channel, increasing the water discharge efficiency when the mud-water mixture passes through the wedge pre-pressing component, enabling the wedge pre-pressing component to operate efficiently and reliably.

[0046] 4. The protrusions are similar to rakes, which can drive more mud-water mixture to move during the sliding of the kneading plate, improving the depth of kneading.

[0047] 5. The rubber belt can prevent the mud-water mixture from entering the gap between the extrusion plate and the kneading plate, ensuring the smooth sliding of the kneading plate. Description of the Drawings

[0048] Figure 1 is a three-dimensional view of the present invention;

[0049] Figure 2It is a perspective view of the sediment and sewage separation device;

[0050] Figure 3 It is a sectional view of the sediment and sewage separation device;

[0051] Figure 4 It is a top view of two groups of wedge-shaped preloading components;

[0052] Figure 5 It is a perspective view of the wedge-shaped preloading component;

[0053] Figure 6 It is Figure 5 The partial enlarged view at A in

[0054] Figure 7 It is a perspective view of an extrusion channel kneading component;

[0055] Figure 8 It is a top view of an extrusion channel;

[0056] Figure 9 It is a bottom view of an extrusion channel;

[0057] Figure 10 It is a schematic diagram in the embodiment;

[0058] The markings in the figure are indicated as:

[0059] 1. Rotary screen; 2. Sand washer; 3. Sediment and sewage separation device; 4. Chemical pretreatment component; 5. Filter screen; 6. Receiving box; 8. Impeller; 9. Feed trough; 10. Reaction cylinder; 11. Conveyor belt; 12. Gravity dewatering component; 13. Wedge-shaped preloading component; 14. High-pressure extrusion component; 15. First mounting frame; 16. Extrusion plate; 17. Extrusion channel; 18. First conveyor belt; 19. Second conveyor belt; 20. Frame; 21. Extrusion roller; 22. Liquid receiving tray; 23. Kneading component; 24. Kneading plate; 25. Second mounting frame; 26. Driving rod; 27. Turntable; 28. Fixed pin; 29. Transmission gear; 30. Driving motor; 31. Driven gear; 32. Toothed belt; 33. Output gear; 34. Protrusion; 35. Rubber belt. Specific embodiments

[0060] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0061] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters in the following drawings represent like items, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0062] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0063] It should be noted that in the description of the present application, the orientation or positional relationships indicated by the orientation terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0064] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0065] Embodiment 1

[0066] As Figure 1-2 shown, a sludge screening device includes a drum screen 1, a sand washer 2, and a sediment sewage separation device 3. The drum screen 1 is used to screen the sediment mixture collected from the river channel and remove large particle debris in the sediment mixture; the sand washer 2 is used to wash the sediment mixture after the large particle debris is removed by the drum screen 1 and wash the sludge on the surface of the sand; the sediment sewage separation device 3 is used to separate the sediment sewage in the sand washer 2 into mud and water. The sediment sewage separation device 3 includes a chemical pretreatment component 4, and the chemical pretreatment component 4 is used to flocculate the sludge in the sediment sewage. It also includes a frame 20 and a conveyor belt 11 arranged on the frame 20, a gravity dewatering component 12, a wedge pre-pressing component 13, and a high-pressure extrusion component 14 with gradually increasing dehydration intensity along the conveying direction of the conveyor belt 11.

[0067] The sediment mixture collected from the river channel enters the drum screen 1 for screening. Large particle debris remains on the filter screen 5 and is discharged from the outlet of the drum screen 1. The remaining sediment mixture passes through the filter screen 5 and falls into the receiving box 6 below, then slides into the feed trough 9 of the sand washer 2. The sand washer 2 is a wheel type sand washer 2. The sediment mixture tumbles and grinds against each other driven by the impeller 8, thereby removing the sludge on the surface of the sand. Then, the washed sand falls from the outlet side of the sand washer 2, while the sludge remains in the sewage in the feed trough 9. The sewage in the sand washer 2 needs to be replaced after a certain period of time and cannot be directly discharged. It needs to be subjected to sludge-water separation treatment. First, it undergoes chemical pretreatment through the chemical pretreatment component 4. The sewage is pumped into the reaction cylinder 10, and a flocculant such as polyaluminum chloride is added to the reaction cylinder 10 to flocculate the sludge in the sludge-water mixture. Then, it is discharged onto the conveyor belt 11 of the sediment sewage separation device 3. As the conveyor belt 11 transports, the sludge-water mixture successively passes through the gravity dewatering component 12, the wedge-shaped pre-pressing component 13, and the high-pressure extrusion component 14 for sludge-water separation. Finally, the sludge is dehydrated into a sludge cake and discharged from the sediment sewage separation device 3, and the sewage also meets the discharge requirements. The sediment sewage separation device 3 has a gravity dewatering component 12, a wedge-shaped pre-pressing component 13, and a high-pressure extrusion component 14 with gradually increasing dehydration intensities, which can improve the sludge-water separation efficiency and ensure the separation quality.

[0068] Example Two

[0069] As Figure 2-4 shown, the wedge-shaped pre-pressing component 13 includes a first mounting frame 15 and an extrusion plate 16. The first mounting frame 15 is fixedly arranged on the frame 20 and straddles the conveyor belt 11; a plurality of extrusion plates 16 are provided. An extrusion channel 17 is formed between two adjacent extrusion plates 16 arranged in a "V" shape. Along the transmission direction of the conveyor belt 11, the width of the extrusion channel 17 gradually decreases.

[0070] After the sludge-water mixture is dehydrated by the gravity dewatering component 12, it is transported to the extrusion channel 17 along with the conveyor belt 11. Due to the gradually decreasing width of the extrusion channel 17, it can play a role in extruding the sludge-water mixture.

[0071] Along the transmission direction of the conveyor belt 11, at least two sets of wedge-shaped pre-pressing components 13 are arranged front and back. The extrusion plates 16 of the two sets of wedge-shaped pre-pressing components 13 front and back are staggered with each other in the direction perpendicular to the transmission direction of the conveyor belt 11. The staggered arrangement can enable part of the sludge-water mixture coming out from the non-extrusion channel 17 of the previous set of wedge-shaped pre-pressing components 13 to enter the extrusion channel 17 of the next set of wedge-shaped pre-pressing components 13, so that part of the sludge-water mixture that has not been extruded can also be extruded and dehydrated.

[0072] Example Three

[0073] As Figure 3As shown, the conveyor belt 11 includes a first conveyor belt 18 and a second conveyor belt 19. The first conveyor belt 18 is located below the wedge-shaped pre-pressing assembly 13. The first conveyor belt 18 and the second conveyor belt 19 gradually approach each other on one side of the frame 20 and gradually move away from each other on the other side of the frame 20. The high-pressure extrusion assembly 14 includes an extrusion roller 21 and a liquid receiving tray 22. A plurality of extrusion rollers 21 are arranged along the common transmission path of the first conveyor belt 18 and the second conveyor belt 19, and the diameter of the extrusion rollers 21 gradually decreases along the transmission direction of the conveyor belt 11. The second conveyor belt 19 is tensioned on the surface of the extrusion rollers 21, and the first conveyor belt 18 is tensioned on the side of the second conveyor belt 19 away from the extrusion rollers 21; the liquid receiving tray 22 is arranged below each extrusion roller 21 for receiving the extruded moisture.

[0074] The muddy water mixture is dehydrated by the gravity dehydration assembly 12 and the wedge-shaped pre-pressing assembly 13 on the first conveyor belt 18 and then continues to be transmitted. It falls to the second conveyor belt 19 at the corner. The muddy water mixture is transmitted between the first conveyor belt 18 and the second conveyor belt 19 and passes through each extrusion roller 21, so that the moisture in the muddy water mixture can be extruded. The moisture falls into the liquid receiving tray 22, and the mud cake with the moisture extruded falls from the other side of the frame 20 where the first conveyor belt 18 and the second conveyor belt 19 gradually move away from each other.

[0075] Embodiment 4

[0076] As Figure 2-7 shown, a kneading assembly 23 is correspondingly arranged for the wedge-shaped pre-pressing assembly 13. The kneading assembly 23 is used for kneading the muddy water mixture passing through the extrusion channel 17. By means of the kneading assembly 23, the water discharge efficiency of the muddy water mixture passing through the wedge-shaped pre-pressing assembly 13 can be increased.

[0077] The kneading assembly 23 includes kneading plates 24, a second mounting frame 25, drive rods 26 and a power assembly. There are two kneading plates 24 in total, and the two kneading plates 24 are respectively slidably arranged on the two extrusion plates 16 forming the extrusion channel 17; the second mounting frame 25 is fixedly arranged on the frame 20 and spans the conveyor belt 11 in parallel with the first mounting frame 15. A turntable 27 is rotatably arranged on the second mounting frame 25, and a fixed pin 28 is arranged at a non-central position on the end face of the turntable 27 facing the kneading plates 24; each kneading plate 24 corresponds to a drive rod 26 and a turntable 27. One end of the drive rod 26 is rotatably connected to the upper end of the kneading plate 24, and the other end is sleeved on the fixed pin 28 of the turntable 27 and rotatably connected to the positioning pin; the power assembly is used for driving the turntables 27 to rotate in the same direction and synchronously. As Figure 9 shown, the positions of the fixed pins 28 on the two turntables 27 corresponding to the two kneading plates 24 of each extrusion channel 17 are always centrosymmetric about the midpoint of the connection line of the centers of the two turntables 27.

[0078] The power assembly drives the two turntables 27 corresponding to the extrusion channel 17 to rotate in the same direction and synchronously, causing the positioning pin to move and drive the drive rod 26 to move, thereby driving the kneading plate 24 to slide reciprocally on the extrusion plate 16. Moreover, the kneading plates 24 on the two extrusion plates 16 are always in a misaligned sliding manner with opposite sliding directions, forming a kneading action on the muddy water mixture conveyed forward in the extrusion channel 17 as shown in Figure 8 This can promote the extrusion and discharge of water on the one hand, and prevent the clogging of the muddy water mixture at the "eight"-shaped small head end of the extrusion channel 17 on the other hand, enabling the wedge-shaped preloading assembly 13 to operate efficiently and reliably.

[0079] A set of the above-mentioned kneading assemblies 23 is correspondingly arranged for each extrusion channel 17. A transmission gear 29 is fixedly connected to one end of the turntable 27 of each kneading assembly 23 away from the fixed pin 28. All the kneading assemblies 23 share the same power assembly, and the power assembly includes a driving motor 30, a driven gear 31, and a toothed belt 32. The driving motor 30 is fixedly arranged on the second mounting bracket 25, and an output gear 33 is arranged at the output end of the driving motor 30; the driven gear 31 is coaxially and fixedly connected to one of the turntables 27; the toothed belt 32 is tensioned and sleeved outside the transmission gears 29 corresponding to all the turntables 27, and the toothed belt 32 meshes with the transmission gears 29.

[0080] When the driving motor 30 is started, it drives the output gear 33 and the driven gear 31 to rotate, thereby causing one of the turntables 27 connected to the driven gear 31 to rotate. The transmission gear 29 corresponding to this turntable 27 also makes a circumferential rotation, and transmits the circumferential rotation motion to each transmission gear 29 through the toothed belt 32, so that the turntables 27 of each kneading assembly 23 all rotate, and the kneading plates 24 in each extrusion channel 17 all perform kneading actions.

[0081] Embodiment Five

[0082] As shown in Figure 10 a protrusion 34 is provided on the side of the kneading plate 24 away from the extrusion plate 16. The protrusion 34 is similar to a rake and can drive more muddy water mixture to move during the sliding process of the kneading plate 24, improving the depth of kneading.

[0083] A rubber belt 35 is provided at one end of the extrusion plate 16 facing the incoming muddy water mixture. The rubber belt 35 is elastic. One end of the rubber belt 35 is fixedly connected to the end of the extrusion plate 16 away from the kneading plate 24. The rubber belt 35 bypasses the end of the extrusion plate 16 and the other end is fixedly connected to the end of the kneading plate 24.

[0084] The rubber belt 35 can prevent the muddy water mixture from entering the gap between the extrusion plate 16 and the kneading plate 24, and can ensure the smooth sliding of the kneading plate 24.

[0085] The screening method includes the following steps:

[0086] S1: Remove debris. The sediment mixture collected from the river channel enters the rotary screen 1 for screening. The rotary screen 1 removes large particle debris to obtain the sediment mixture.

[0087] S2: Wash sand. The sediment mixture enters the wheel sand washer 2 to wash the sludge on the surface of the sand, obtaining sand and a muddy water mixture.

[0088] S3: Mud dewatering and solid-liquid separation. The muddy water mixture obtained in S2 is chemically pretreated by the chemical pretreatment component 4 to flocculate the sludge in the muddy water mixture, and then discharged onto the conveyor belt 11 of the sediment sewage separation device 3. Along with the transmission of the conveyor belt 11, the muddy water mixture sequentially passes through the gravity dewatering component 12, the wedge pre-pressing component 13, and the high-pressure extrusion component 14 for solid-liquid separation. Finally, the sludge is dehydrated into a mud cake and discharged from the sediment sewage separation device 3. Among them, while the muddy water mixture is being pre-pressed by the wedge pre-pressing component 13, it is kneaded by the kneading component 23.

[0089] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and the features in the embodiments in the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A sludge screening device, characterized in that ,include: A drum screen (1), the drum screen (1) being used to screen the sediment mixture collected in the river channel, and to screen out large particles of debris in the sediment mixture; A sand washer (2), the sand washer (2) being used to clean the mud-sand mixture after the large particles of impurities are screened out by the drum screen (1), and to wash away the sludge on the surface of the sand; A sediment and sewage separation device (3), the sediment and sewage separation device (3) being used to separate sediment and sewage in a sand washer (2) from sediment and water, the sediment and sewage separation device (3) comprising a chemical pretreatment component (4), the chemical pretreatment component (4) being used to flocculate sludge in the sediment and sewage, and further comprising a frame (20) and a conveyor belt (11) arranged on the frame (20), a gravity dehydration component (12) whose dehydration intensity increases successively along the conveying direction of the conveyor belt (11), a wedge-shaped pre-pressing component (13) and a high-pressure extrusion component (14); The wedge-shaped preloading component (13) comprises: A first mounting frame (15), the first mounting frame (15) being fixedly mounted on the frame (20) and spanning the conveyor belt (11); A plurality of extrusion plates (16) are provided, and an extrusion channel (17) is formed between two adjacent extrusion plates (16) arranged in an "eight" shape, and the width of the extrusion channel (17) gradually decreases along the transmission direction of the conveyor belt (11); The wedge-shaped pre-pressing component (13) is correspondingly provided with a kneading component (23), and the kneading component (23) is used to knead the mud-water mixture passing through the extrusion channel (17); The kneading component (23) comprises: A kneading plate (24), wherein there are two kneading plates (24), and the two kneading plates (24) are respectively slidably arranged on two extrusion plates (16) forming the extrusion channel (17); A second mounting frame (25), the second mounting frame (25) being fixedly mounted on the frame (20) and parallel to the first mounting frame (15) and spanning the conveyor belt (11), a turntable (27) being rotatably mounted on the second mounting frame (25), a fixing pin (28) being disposed at a non-center position on the end surface of the turntable (27) on the side facing the kneading plate (24); A driving rod (26), each kneading plate (24) corresponding to a driving rod (26) and a rotating disk (27), one end of the driving rod (26) is rotatably connected to the upper end of the kneading plate (24), and the other end is sleeved on a fixing pin (28) of the rotating disk (27) and rotatably connected to a positioning pin; A power assembly, the power assembly is used to drive the turntable (27) to rotate synchronously in the same direction, and the positions of the fixing pins (28) on the two turntables (27) corresponding to the two kneading plates (24) of each extrusion channel (17) are always symmetrical about the center of the midpoint of the line connecting the centers of the two turntables (27); Each extrusion channel (17) is provided with a group of the above-mentioned kneading components (23) correspondingly, and one end of the rotating disk (27) of each kneading component (23) away from the fixing pin (28) is fixedly connected to a transmission gear (29), and all the kneading components (23) share the same power component, which comprises: A drive motor (30), wherein the drive motor (30) is fixedly mounted on the second mounting frame (25), and an output gear (33) is disposed at an output end of the drive motor (30); A driven gear (31), the driven gear (31) being coaxially fixedly connected to one of the rotating disks (27); A toothed belt (32) is tensioned and sleeved outside the transmission gears (29) corresponding to all the rotating disks (27), and the toothed belt (32) is meshed with the transmission gears (29).

2. A sludge screening device according to claim 1, characterized in that: At least two groups of wedge-shaped pre-pressing components (13) are arranged front and rear along the transmission direction of the conveyor belt (11), and the extrusion plates (16) of the two groups of wedge-shaped pre-pressing components (13) are staggered with each other in a direction perpendicular to the transmission direction of the conveyor belt (11).

3. A sludge screening device according to claim 2, characterized in that: The conveyor belt (11) comprises a first conveyor belt (18) and a second conveyor belt (19), the first conveyor belt (18) being located below the wedge-shaped pre-pressing assembly (13), the first conveyor belt (18) and the second conveyor belt (19) gradually approaching each other on one side of the frame (20) and gradually moving away from each other on the other side of the frame (20), and the high-pressure extrusion assembly (14) comprising: A plurality of squeezing rollers (21) are provided along a common transmission path of the first conveyor belt (18) and the second conveyor belt (19), and the diameter of the squeezing rollers (21) gradually decreases along the transmission direction of the conveyor belt (11); the second conveyor belt (19) is tensioned on the surface of the squeezing rollers (21); and the first conveyor belt (18) is tensioned on a side of the second conveyor belt (19) away from the squeezing rollers (21); A liquid receiving pan (22), wherein the liquid receiving pan (22) is arranged below each squeezing roller (21) and is used to receive squeezed water.

4. A sludge screening device according to claim 3, characterized in that: A protrusion (34) is provided on the side of the kneading plate (24) away from the squeezing plate (16).

5. A sludge screening device according to claim 4, characterized in that: A rubber belt (35) is provided at one end of the extrusion plate (16) toward which the mud-water mixture is introduced. The rubber belt (35) is elastic. One end of the rubber belt (35) is fixedly connected to one end of the extrusion plate (16) facing away from the kneading plate (24). The rubber belt (35) bypasses the end of the extrusion plate (16) and the other end is fixedly connected to the end of the kneading plate (24).

6. A sludge screening device according to claim 5, characterized in that: The screening method includes the following steps: S1: Screening out debris. The sediment mixture collected from the river channel enters the drum screen (1) for screening. The drum screen (1) screens out large particles of debris to obtain a sediment mixture; S2: Sand washing: the sand-mud mixture enters the wheel-type sand washer (2) for sand washing to remove the sludge on the surface of the sand, thereby obtaining a mixture of sand and muddy water; S3: Mud dehydration and water separation. The mud-water mixture obtained in S2 is chemically pretreated by a chemical pretreatment component (4) to flocculate the sludge in the mud-water mixture, and then discharged to the conveyor belt (11) of the mud-sand and sewage separation device (3). As the conveyor belt (11) is transported, the mud-water mixture is sequentially passed through a gravity dehydration component (12), a wedge-shaped pre-pressing component (13) and a high-pressure extrusion component (14) for mud-water separation. Finally, the sludge is dehydrated and becomes a mud cake, which is discharged from the mud-sand and sewage separation device (3). The mud-water mixture is kneaded by the kneading component (23) while being pre-pressed by the wedge-shaped pre-pressing component (13).

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