A sludge spiral processing device and a sludge processing process

Abstract

The present application discloses a kind of sludge stacking screw treatment equipment and sludge treatment process, it is related to sludge dewatering treatment technical field, including flocculation mixing unit and machine case, the flocculation mixing unit and machine case are interconnected by pipeline, double shear unit ring group is arranged on the machine case, multiple-speed spiral is arranged in the double shear unit ring group;The beneficial effects of the present application are that double shear unit ring group is designed in stacking screw equipment, wherein the double floating ring group composed of first dynamic ring body and second dynamic ring body is arranged between the adjacent two half fixed ring bodies, so that the equipment generates relative wandering and yawing between the adjacent half fixed ring bodies and the first dynamic ring body and the second dynamic ring body when carrying out sludge-water separation work, enhances rubbing, grinding and shearing effect, destroys flocculation structure prone to bridging, improves dewatering quality and efficiency, increases the gap between the adjacent half fixed ring bodies, and avoids sludge bridging and plugging in filter gap.

Description

Technical Field

[0001] This invention relates to the field of sludge dewatering and treatment technology, and in particular to a sludge press screw press treatment device and sludge treatment process. Background Technology

[0002] In sludge treatment, screw presses are typically used to separate sludge from wastewater. Their core working principle involves the alternating stacking of fixed and moving rings to form filter gaps, with the screw shaft propelling the sludge forward to achieve solid-liquid separation. Existing technologies involved include:

[0003] 1. CN108275863B A screw press sludge dewatering machine includes a screw press body formed by alternating fixed rings and moving rings, and a spiral shaft penetrating the screw press body. The front end of the screw press body is a thickening section, and the rear end is a dewatering section. Several fixed rings arranged at intervals in the dewatering section adopt an irregular fixed ring group structure. The irregular fixed ring group has the same center and the same inner diameter as the fixed ring. The irregular fixed ring group includes an irregular fixed ring, a fixed half ring, and a detachable half ring. The fixed half ring and the detachable half ring are located between two irregular fixed rings and are spliced ​​to form a ring structure. The irregular fixed ring and the detachable half ring are provided with connecting holes at corresponding positions and are connected by fasteners. The distance between the connecting hole and the center is not less than the distance between the connecting part of the fixed ring and the center.

[0004] 2. CN115177999B A stacked spiral solid-liquid separator with vibrating rings, comprising: a filter chamber and a spiral shaft passing through it; the spiral shaft rotates under the drive of a drive motor; the filter chamber is supported by at least two support plates; the filter chamber includes: multiple fixed rings and multiple vibrating rings stacked alternately; the outer circumference of the vibrating rings is provided with vibrating ring through holes, and all the vibrating rings are connected in series to form a stable vibrating linkage through the vibrating ring through holes, the vibrating ring through rods passing through the vibrating ring through the support plates; a vibrator is provided on the vibrating linkage, the vibration of the vibrator drives all the vibrating rings to vibrate, and all the vibrating rings generate relative displacement relative to all the fixed rings, so that the filter gap remains unobstructed, and the filtrate is discharged from the filter gap, thereby realizing the solid-liquid separation function.

[0005] Including but not limited to the aforementioned existing technologies, whether it is a split-type fixed-moving ring assembly or an integrated fixed-moving ring assembly, the core of which is that only one layer of movable ring is set between two adjacent fixed rings. Two annular filter gaps are formed between the end faces of the fixed rings and the movable rings. After the filtrate passes through the two gaps, it flows into the annular space formed by the two fixed rings. The width of the annular space is the thickness of the movable ring. Due to the narrow size of the annular space and the movement of only one layer of movable ring, when treating sludge containing fibers, hair, or high viscosity, fine particles and sticky substances are very easy to bridge and accumulate in the gap formed between the two fixed rings. It is difficult to remove the accumulation by scraping the end face of a single layer of movable ring, resulting in frequent clogging of the filter gaps, obstruction of filtrate discharge, affecting the stability of equipment operation, and low treatment efficiency.

[0006] Including but not limited to the above-mentioned existing technologies, the sludge discharge gap near the back pressure plate does not have an active cleaning function. It can only rely on the newly generated sludge cake to push out the old sludge that has been adhered or accumulated in the gap during the axial extrusion process by the spiral thrust. When processing sludge containing fibers or high viscosity, the old sludge accumulated in the gap is more likely to form fiber entanglement or adhesive accumulation, and it is difficult for the new sludge to push it out stably, which eventually leads to partial or complete blockage of the sludge discharge gap. In severe cases, it forces the equipment to stop for cleaning.

[0007] Including but not limited to the aforementioned existing technologies, the screw shaft of existing screw presses is driven by a single motor. Although the overall speed can be adjusted by a frequency converter, the speeds of the dewatering section and the thickening section can only change synchronously and cannot be controlled independently. The thickening section requires a lower speed to ensure that the sludge has sufficient thickening time under gravity, while the dewatering section requires a higher speed to enhance shear force and extrusion strength, thereby reducing the moisture content of the sludge cake. When the sludge concentration changes, a single speed cannot adjust the optimal working conditions according to the actual situation, resulting in fluctuations in dewatering performance and making it difficult to control the moisture content of the sludge cake.

[0008] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Summary of the Invention

[0009] The purpose of this invention is to solve the above-mentioned problems by designing a sludge press decanter treatment device and sludge treatment process. This invention addresses the shortcomings of existing decanter presses, which only have one layer of movable rings between adjacent fixed rings. The filter gaps are narrow and rely solely on scraping from the end face of a single movable ring. When processing sludge containing fibers, hair, or high viscosity, fine particles and sticky substances easily bridge and accumulate in the gaps between the fixed rings, leading to frequent filter blockage, poor filtrate discharge, poor equipment stability, and low processing efficiency. Furthermore, the sludge outlet gaps near the back pressure plate lack active cleaning capabilities, relying solely on the axial thrust of subsequent new sludge cakes to push out the old sludge. When processing sludge containing fibers or high viscosity, fiber entanglement or adhesive accumulation easily forms in the gaps, making it difficult for new sludge to stably push it out, ultimately causing partial or complete blockage of the sludge outlet gaps. In severe cases, machine shutdown for cleaning is necessary. Additionally, the screw shaft is driven by a single motor, meaning the speeds of the dewatering and thickening sections can only change synchronously. The thickening section requires a lower rotation speed to ensure sufficient thickening time, while the dewatering section requires a higher rotation speed to enhance shear force and extrusion strength. A single rotation speed cannot adjust the optimal working conditions according to changes in sludge concentration, resulting in fluctuations in dewatering performance and difficulty in controlling the moisture content of the sludge cake.

[0010] The technical solution of the present invention to achieve the above objectives is as follows: a sludge press screw treatment device, comprising a flocculation mixing unit and a casing, wherein the flocculation mixing unit and the casing are interconnected by a pipeline, a double shear unit ring assembly is provided on the casing, a multi-speed screw conveyor is provided in the double shear unit ring assembly, the multi-speed screw conveyor is movably inserted into the casing and the double shear unit ring assembly, the end of the casing away from the pipeline is the discharge end, a self-cleaning back pressure device is provided on the casing and corresponding to the discharge end, the self-cleaning back pressure device is interconnected with the multi-speed screw conveyor;

[0011] The double shear unit ring group includes two opposing limiting frame groups, which are symmetrically spliced ​​together. Each opposing limiting frame group is fitted with multiple semi-fixed rings. A double floating ring group is movably arranged between two adjacent semi-fixed rings. The double floating ring group is composed of a first moving ring and a second moving ring.

[0012] The double shear unit ring assembly has a first motion state and a second motion state;

[0013] The first motion state is that the entire double floating ring assembly moves between two adjacent semi-fixed ring bodies, and the second motion state is that the first moving ring body and the second moving ring body move relative to each other;

[0014] The self-cleaning back pressure device includes a back plate, on which a T-shaped scraper is movably inserted via an elastic part, and the T-shaped scraper is movably attached to the discharge end wall of the machine casing.

[0015] The multi-speed screw conveyor includes a dehydration section and a compression section, which are rotatably connected by a sealed bearing, and are movably inserted into the casing.

[0016] Preferably, the first moving ring body includes a first ring plate, on which an inner ring protrusion is provided, and multiple outer protrusions are evenly distributed on the outer edge of the inner ring protrusion. The inner diameter of the inner ring protrusion is the same as the inner diameter of the first ring plate.

[0017] The second moving ring body includes a second ring plate with the same structure as the first ring plate. An outer ring protrusion is provided on the wall surface of the second ring plate opposite to the first ring plate. Multiple inner protrusions are evenly distributed on the inner edge of the outer ring protrusion. The outer diameter of the outer ring protrusion is the same as the outer diameter of the second ring plate.

[0018] Preferably, each of the limiting bracket assemblies includes two semi-circular brackets, and connecting ears are symmetrically arranged on the opposite walls of the two semi-circular brackets. A first bolt is movably inserted into the connecting ear, and a first nut is movably fitted onto the first bolt through a thread. Multiple threaded rods are evenly distributed on the two semi-circular brackets, and a second nut is movably fitted onto both ends of each threaded rod through a thread. Each semi-circular bracket is also provided with mounting holes that match the chassis.

[0019] Preferably, each of the semi-fixed rings includes a semi-ring, which is tangent to the multi-speed screw, and the outer edge of the semi-ring is evenly distributed with a plurality of lugs that match the threaded insert rod, and washers are movably provided on both sides of the lugs.

[0020] Preferably, the back plate includes a back pressure plate, which is movably mounted on the multi-speed auger via a guide assembly. The T-shaped scraper is movably inserted into the back pressure plate, and the T-shaped scraper has a right-angle notch that matches the chassis.

[0021] The elastic part includes a bending frame, which is mounted on a back pressure plate. A retaining ring is fixedly fitted on the bending frame. The T-shaped scraper is mounted on one end of the bending frame via a spring column. A rotating ring seat is fixedly mounted on the back pressure plate. A connecting ring is movably inserted into the rotating ring seat. An extension member is provided between the connecting ring and the chassis.

[0022] Preferably, the chassis includes a rectangular box, on which multiple extension sleeves are installed that match the mounting holes. A second bolt is movably inserted into the rectangular box, the extension sleeves, and the mounting holes. A third nut is movably fitted onto the second bolt via threads. A feed pipe is inserted into one side wall of the rectangular box, with one end of the feed pipe being a closed structure. The pipe is connected to the feed pipe. A discharge pipe is inserted into the other side wall of the rectangular box. Both the feed pipe and the discharge pipe are attached to a semi-circular frame. A liquid-aggregating tank is located at the lower end of the rectangular box, and a support is located on one side of the liquid-aggregating tank. The flocculation mixing unit is located on the support. An extension box is located on the rectangular box, and the right-angle notch matches the inner wall of the discharge pipe and the outer wall of the rectangular box.

[0023] Preferably, the dehydration section includes a cylindrical rotating shaft with an insertion shaft at one end; the compression section includes a frustum-shaped rotating shaft with an insertion port at one end, into which a sealed bearing is inserted, and the insertion shaft is inserted into the sealed bearing; the other end of the frustum-shaped rotating shaft is provided with a mounting shaft, which is movably inserted into an extension box; both the dehydration and compression rotating shafts are fixedly fitted with spiral blades tangent to the limiting frame assembly, the double shear unit ring assembly, and the machine housing; the junction of the spiral blades and the compression spiral blades is provided with clearance notches; and both the cylindrical rotating shaft and the mounting shaft are equipped with a reduction gearbox, on which a motor is mounted.

[0024] Preferably, the guide component includes a limiting key, which is disposed on the mounting shaft. A guide groove is provided on the back pressure plate. The width of the guide groove is the same as the width of the limiting key, and the length of the guide groove is greater than the length of the limiting key.

[0025] Preferably, a guide rod is installed on the back pressure plate, the T-shaped scraper is movably fitted onto the guide rod, and a limit block is installed at one end of the guide rod.

[0026] A sludge treatment process includes the following steps:

[0027] Step 1: The submersible pump transports the sludge from the sludge tank to the metering tank in the flocculation mixing unit. Excess sludge is returned to the sludge tank through the overflow pipe. The polymer flocculant is added to the flocculation mixing tank by the metering dosing pump. The flocculation mixing tank is equipped with a stirring motor to fully mix the sludge and flocculant. When the liquid level in the flocculation mixing unit reaches the high limit, the sludge inlet pump and the dosing pump are automatically shut off. When the liquid level drops to the low limit, the submersible pump and the metering dosing pump are restarted.

[0028] Step 2: The mixed sludge flocs enter the working chamber between the chassis and the multi-speed screw conveyor and the double shear unit ring assembly through the pipeline;

[0029] Step 3: The dewatering section and the compression section are each equipped with a motor. The speed difference is adjusted according to the sludge concentration. When the concentration is low, the speed of the dewatering section is faster than that of the compression section to improve the pushing efficiency. When the concentration is high, the speeds are the same.

[0030] Step 4: The filtration channel is composed of semi-fixed rings and double floating rings. In the first motion state, the double floating rings move and sway circumferentially between adjacent semi-fixed rings. In the second motion state, the first and second moving rings move and sway relative to each other. The first and second motion states work together to squeeze and dewater the sludge flocs. The filtrate eventually enters the casing and is then returned to the raw water tank or enters the subsequent treatment system. The sludge cake is discharged from between the discharge end of the casing and the back pressure plate.

[0031] Step 5: The T-shaped scraper on the self-cleaning back pressure device always fits against the wall of the discharge end of the machine under the action of the spring column. As the back pressure plate rotates, it scrapes off the mud cake and residual sludge attached to the discharge end in real time.

[0032] Step 6: The dehydrated mud cake is directly transported to transportation or post-processing facilities by a screw conveyor for reuse.

[0033] This invention discloses a sludge dewatering device and process. The dewatering device incorporates a double-shear unit ring assembly, where a double floating ring assembly, composed of a first moving ring and a second moving ring, is positioned between adjacent semi-fixed rings. During sludge-water separation, the entire double floating ring assembly moves and oscillates relative to each other, both between adjacent semi-fixed rings and between the first and second moving rings. This enhances the kneading, grinding, and shearing effects, disrupting easily bridging floc structures and improving dewatering quality and efficiency. Furthermore, the increased gap between adjacent semi-fixed rings prevents sludge bridging and clogging in the filter gaps, thus improving overall performance. To improve filtrate discharge efficiency and operational stability, the T-shaped scraper in the self-cleaning back pressure unit always adheres to the discharge end wall of the casing under the action of the elastic part. As it rotates with the back pressure plate, it scrapes off the attached sludge cake and residual sludge in real time, preventing the discharge gap from being blocked by sludge accumulation or fiber entanglement, thus ensuring continuous discharge of sludge cake. The dewatering section and compression section of the multi-speed screw conveyor are rotatably connected by sealed bearings and each is equipped with an independent drive. The speed can be independently adjusted according to the sludge concentration, realizing flexible adaptation to sludge of different concentrations. This overcomes the defect that the traditional single-shaft synchronous speed cannot take into account the optimal conditions for concentration and dewatering, effectively controlling the moisture content of the sludge cake and improving the overall dewatering performance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the sludge press screw treatment device described in this invention, viewed from the left side.

[0035] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the sludge press screw treatment device described in this invention, viewed from the right side.

[0036] Figure 3 This is a schematic diagram of the main cross-sectional structure of a sludge press screw treatment device according to the present invention.

[0037] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the casing of the sludge press screw treatment equipment described in this invention.

[0038] Figure 5 This is a partial three-dimensional structural diagram of the double shear unit ring group of the sludge press screw treatment device of the present invention.

[0039] Figure 6 This is a three-dimensional structural diagram of the first moving ring of the sludge press screw treatment device according to the present invention.

[0040] Figure 7 This is a three-dimensional structural diagram of the second moving ring of a sludge press screw press treatment device according to the present invention.

[0041] Figure 8 This is a three-dimensional structural diagram of the dewatering section of a sludge press screw treatment device according to the present invention.

[0042] Figure 9 This is a three-dimensional structural diagram of the compression section of a sludge press screw press treatment device according to the present invention.

[0043] Figure 10 The sludge press screw press treatment equipment described in this invention Figure 3 Enlarged view of a portion of point A in the middle.

[0044] In the picture:

[0045] 1. Flocculation and mixing unit; 2. Chassis, 21. Rectangular box, 22. Extension sleeve, 23. Second bolt, 24. Third nut, 25. Feed pipe, 26. Discharge pipe, 27. Concentration tank, 28. Support, 29. Extension box; 3. Pipeline; 4. Control and limiting frame assembly, 41. Half-moon frame, 42. Connecting lug, 43. First bolt, 44. First nut, 45. Threaded insert, 46. Second nut, 47. Mounting hole; 5. Semi-fixed ring body, 51. Half ring, 52. Hanging lug, 53. Washer; 6. Double floating ring assembly; 61. First moving ring body, 611. First ring piece, 612. Inner ring convex ring, 613. Outer boss; 62. Second moving ring body, 621. Second ring piece, 622. 7. Outer ring convex ring; 8. Inner boss; 9. Multi-speed screw conveyor; 10. Cylindrical shaft; 11. Insert shaft; 22. Frustum-shaped shaft; 33. Insertion port; 4. Sealed bearing; 5. Mounting shaft; 6. Spiral blade; 708. Clearance notch; 809. Gearbox; 710. Motor; 11. Self-cleaning back pressure unit; 12. T-shaped scraper; 13. Back plate; 14. Back pressure plate; 15. Right angle notch; 16. Limit key; 27. Guide groove; 38. Elastic part; 19. Bending frame; 20. Retaining ring; 21. Rotating ring seat; 22. Connecting ring; 33. Telescopic component; 44. Guide rod; 55. Limit block; 66. Spring column. Detailed Implementation

[0046] Example 1:

[0047] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-10 As shown, a sludge press screw press treatment device is used.

[0048] A sludge press screw press treatment device includes a flocculation mixing unit 1 and a casing 2. The flocculation mixing unit 1 and the casing 2 are interconnected by a pipe 3. A double shear unit ring assembly is provided on the casing 2. A multi-speed screw conveyor 7 is provided in the double shear unit ring assembly. The multi-speed screw conveyor 7 is movably inserted into the casing 2 and the double shear unit ring assembly. The end of the casing 2 away from the pipe 3 is the discharge end. A self-cleaning back pressure device 8 is provided on the casing 2 and corresponding to the discharge end. The self-cleaning back pressure device 8 is interconnected with the multi-speed screw conveyor 7.

[0049] Place the equipment at the target location and connect it to the power supply and control system. The control system can be a control panel with a built-in microcontroller. The microcontroller can be programmed with software. By writing the control program, the device can be controlled. Since this is existing technology, it will not be described in detail here. When the equipment is working, the sludge to be treated is added to the flocculation mixing unit 1 through a submersible pump. In the flocculation mixing unit 1, it is mixed with flocculant to form flocs. Then, it enters the housing 2 through the pipe 3. Under the action of the multi-speed screw conveyor 7 and the double shear unit ring group, the sludge is dewatered. The sludge cake is discharged from the gap between the housing 2 and the self-cleaning back pressure device 8. At the same time, the self-cleaning back pressure device 8 can automatically scrape and clean the gap between the housing 2 and the self-cleaning back pressure device 8 to ensure the smooth discharge of the sludge cake.

[0050] The double shear unit ring group includes two opposing limiting frame groups 4, which are symmetrically spliced ​​together. Each opposing limiting frame group 4 is fitted with multiple semi-fixed ring bodies 5. A double floating ring group 6 is movably arranged between two adjacent semi-fixed ring bodies 5. The double floating ring group 6 is composed of a first moving ring body 61 and a second moving ring body 62.

[0051] Two semi-fixed rings 5 ​​can be symmetrically spliced ​​to form a complete ring, which is fitted around the spiral blades 707 of the multi-speed screw 7 and kept tangent to the multi-speed screw 7. Through the symmetrical splicing of two opposing limiting frame groups 4, when it is necessary to disassemble the double shear unit ring group, the semi-fixed rings 5 ​​can be disassembled along the radial direction of the multi-speed screw 7 without disassembling along the axial direction of the multi-speed screw 7, thus improving maintenance efficiency.

[0052] The double shear unit ring assembly has a first motion state and a second motion state;

[0053] The first motion state is that the double floating ring group 6 moves between two adjacent semi-fixed ring bodies 5 as a whole, and the second motion state is that the first moving ring body 61 and the second moving ring body 62 move relative to each other.

[0054] The self-cleaning back pressure device 8 includes a back plate 82, on which a T-shaped scraper 81 is movably inserted via an elastic part 83. The T-shaped scraper 81 is movably attached to the discharge end wall of the casing 2.

[0055] During sludge dewatering, as the sludge is squeezed into the filter gap between the semi-fixed ring 5 and the double floating ring group 6, the filtrate sequentially passes through the filter gap between the semi-fixed ring 5 and the first moving ring 61, the filter gap between the first moving ring 61 and the second moving ring 62, and the filter gap between the second moving ring 62 and the end face of the adjacent fixed ring, finally flowing into the gap between two adjacent semi-fixed rings 5. The placement of the first moving ring 61 and the second moving ring 62 between two adjacent semi-fixed rings 5 ​​ensures that the filter gap is sufficiently small while increasing the gap between the two adjacent semi-fixed rings 5, preventing overflowing debris from bridging at the gap, ensuring smooth flow of filtrate from the sludge, and guaranteeing efficient sludge-water separation. When performing sludge-water separation, the double floating ring assembly 6 can move and swing around between two adjacent semi-fixed rings 5, forming the first motion state. This is the working principle of the existing screw press, so it will not be described in detail. At the same time, due to the active fit between the first moving ring 61 and the second moving ring 62, they will also move and swing relative to each other, forming the second motion state. Under the combination of the first and second motion states, a relative rubbing and shearing interface is formed between the first moving ring 61 and the second moving ring 62, which can apply rubbing, grinding and shearing action to the sludge flocs entering between the first moving ring 61 and the second moving ring 62, and further squeeze and dewater them.

[0056] The multi-speed screw conveyor 7 includes a dehydration section and a compression section, which are rotatably connected by a sealed bearing 705, and the dehydration section and the compression section are movably inserted into the casing 2.

[0057] The dewatering section and the compression section rotate together in the double shear unit ring assembly for extrusion dewatering. The dewatering section and the compression section are rotatably connected by a sealed bearing 705 to ensure that the dewatering section and the compression section are coaxially set. In actual operation, the speed of the dewatering section and the compression section can be different and adjusted according to the actual sludge concentration. When the sludge concentration is low, the speed of the dewatering section can be faster than that of the compression section. At this time, the dewatering section with a higher speed has a greater pushing force and a faster material conveying speed to push the low-concentration sludge forward faster, thereby improving the flocculent conveying efficiency. Due to the different speeds of the dewatering section and the compression section, sludge accumulates at their junction and is further squeezed and drained. After a period of time, the speed is reduced to relieve the sludge accumulated at the junction of the dewatering section and the compression section. After entering the compression section, the compression section further squeezes the sludge and uses the discharge resistance provided by the back pressure plate 821 to generate high pressure in the compression chamber to fully squeeze out the residual filtrate. When the sludge concentration is high, the speeds of the dewatering section and the compression section can be the same.

[0058] The first moving ring body 61 includes a first ring piece 611, on which an inner ring protrusion 612 is provided. Multiple outer protrusions 613 are evenly distributed on the outer edge of the inner ring protrusion 612. The inner diameter of the inner ring protrusion 612 is the same as the inner diameter of the first ring piece 611.

[0059] The second moving ring body 62 includes a second ring piece 621 with the same structure as the first ring piece 611. An outer ring protrusion 622 is provided on the wall surface of the second ring piece 621 opposite to the first ring piece 611. Multiple inner protrusions 623 are evenly distributed on the inner ring edge of the outer ring protrusion 622. The outer diameter of the outer ring protrusion 622 is the same as the outer diameter of the second ring piece 621.

[0060] The inner ring 612 of the first moving ring 61 faces the second moving ring 62, and the outer ring 622 of the second moving ring 62 faces the first moving ring 61. Multiple outer protrusions 613 are evenly distributed along the outer edge of the inner ring 612, and multiple inner protrusions 623 are evenly distributed along the inner edge of the outer ring 622 for constraint. The first moving ring 61 and the second moving ring 62 are mutually fitted through the outer ring 622 and multiple inner protrusions 623, and the inner ring 612 and multiple outer protrusions 613. The arrangement of the outer ring 622 and multiple inner protrusions 623, and the inner ring 612 and multiple outer protrusions 613, achieves the range of relative floating between the first moving ring 61 and the second moving ring 62. The sludge is restricted in the surrounding area. When the multi-speed screw conveyor 7 rotates and pushes the sludge, the sludge pressure acts on the double floating ring group 6 in the axial and radial directions, causing the whole to move and swing in the circumferential direction between the adjacent semi-fixed rings 5, which is the first motion state. At the same time as this whole movement, since the force exerted by the sludge on the first moving ring 61 and the second moving ring 62 is not completely symmetrical, the two moving rings will generate asynchronous small movements and swings, forming the second motion state. The sludge flocs entering between the first moving ring 61 and the second moving ring 62 are subjected to kneading, grinding and shearing action, so that the bound water in the flocs is forced out, further refining the mud-water separation and destroying the easily bridging floc structure.

[0061] Meanwhile, the inner diameter of the inner ring 612 is consistent with the inner diameter of the first ring plate 611, ensuring that the inner hole of the moving ring body and the multi-speed screw 7 are in tangential or micro-gap fit. The outer diameter of the outer ring 622 on the second moving ring body 62 is the same as the outer diameter of the second ring plate 621, ensuring the appearance consistency of the first moving ring body 61 and the second moving ring body 62.

[0062] In practical work, the first moving ring 61 can also be used independently between the two semi-fixed rings 5 ​​to adjust the gap between the two semi-fixed rings 5. This is not limited here.

[0063] Each pair of limiting brackets 4 includes two semi-circular brackets 41. Connecting ears 42 are symmetrically arranged on the opposite walls of the two semi-circular brackets 41. A first bolt 43 is movably inserted into the connecting ear 42. A first nut 44 is movably fitted onto the first bolt 43 through threads. Multiple threaded rods 45 are evenly distributed on the two semi-circular brackets 41. A second nut 46 is movably fitted onto both ends of each threaded rod 45 through threads. Each semi-circular bracket 41 is also provided with mounting holes 47 that match the chassis 2.

[0064] A single pair of limiting frame 4 consists of two crescent frames 41 connected to a second nut 46 via multiple threaded rods 45. The two pair of limiting frame 4 are spliced ​​together by the mutual docking of the connecting ears 42 on the crescent frames 41 and then by installing the first bolt 43 and the first nut 44.

[0065] Each semi-fixed ring 5 includes a semi-ring 51, which is tangent to the multi-speed screw 7. The outer edge of the semi-ring 51 is evenly distributed with multiple lugs 52 that match the threaded insert 45. Washers 53 are movably provided on both sides of the lugs 52.

[0066] Two semi-rings 51 can be symmetrically spliced ​​to form a complete ring. The lug 52 and the semi-ring 51 are an integral structure. The semi-fixed ring 5 is fitted onto the threaded rod 45 through the lug 52. The washer 53 is fitted onto the threaded rod 45 to support the two adjacent lugs 52, thus forming the fixed ring structure in the traditional screw press.

[0067] The back plate 82 includes a back pressure plate 821, which is movably mounted on the multi-speed auger 7 via a guide assembly. A T-shaped scraper 81 is movably inserted into the back pressure plate 821. The T-shaped scraper 81 has a right-angle notch 822 that matches the chassis 2.

[0068] The elastic part 83 includes a bending frame 831, which is mounted on the back pressure plate 821. A retaining ring 832 is fixedly fitted on the bending frame 831. A T-shaped scraper 81 is mounted on one end of the bending frame 831 via a spring column 838. A rotating ring seat 833 is fixedly mounted on the back pressure plate 821. A connecting ring 834 is movably inserted into the rotating ring seat 833. An extension member 835 is provided between the connecting ring 834 and the chassis 2.

[0069] The telescopic component 835 can be an electric push rod with a guiding function. In actual operation, the telescopic component 835 can drive the back pressure plate 821 to move along the axial direction of the multi-speed screw conveyor 7 to adjust the size of the mud cake discharge gap. During mud-water separation, the multi-speed screw conveyor 7 drives the back pressure plate 821 to rotate. With the connection of the telescopic component 835, the rotating ring seat 833 rotates with the back pressure plate 821 at one end of the connecting ring 834. The elastic part 83 and the T-shaped scraper 81 rotate with the back pressure plate 821. In the working state of the self-cleaning back pressure device 8, the spring column 838 is in a compressed state. With the extension and retraction of the telescopic component 835, under the rebound force of the spring column 838, the right angle notch 822 is always stuck at the discharge end of the machine box 2. Through the rotation of the T-shaped scraper 81, the mud cake and residual sludge attached to the discharge end are scraped, and the adhesive is removed in real time, thereby preventing the discharge port from being blocked due to sludge accumulation.

[0070] The chassis 2 includes a rectangular box 21. Multiple extension sleeves 22 are installed on the rectangular box 21 to match the mounting holes 47. Second bolts 23 are movably inserted into the rectangular box 21, the extension sleeves 22 and the mounting holes 47. Third nuts 24 are movably fitted onto the second bolts 23 through threads. A feed pipe 25 is inserted into one side wall of the rectangular box 21. One end of the feed pipe 25 is a closed structure. Pipe 3 is connected to the feed pipe 25. A discharge pipe 26 is inserted into the other side wall of the rectangular box 21. Both the feed pipe 25 and the discharge pipe 26 are attached to the crescent frame 41. A liquid collection tank 27 is provided at the lower end of the rectangular box 21. A support 28 is provided on one side of the liquid collection tank 27. The flocculation mixing unit 1 is provided on the support 28. An extension box 29 is provided on the rectangular box 21. A right-angle notch 822 matches the inner wall of the discharge pipe 26 and the outer wall of the rectangular box 21.

[0071] The limiting frame assembly 4 is connected to the rectangular box 21 through the corresponding setting of the mounting hole 47 and the extension sleeve 22, and the connection of the second bolt 23 and the third nut 24. The filtered filtrate is collected in the condensation tank 27 and discharged from the condensation tank 27. The support 28 is used to install the flocculation mixing unit 1. The right angle notch 822 matches the inner wall of the discharge pipe 26 and the outer wall of the rectangular box 21 to realize the cleaning function of the T-shaped scraper 81.

[0072] The dehydration section includes a cylindrical rotating shaft 701, with an insertion shaft 702 at one end. The compression section includes a frustum-shaped rotating shaft 703, with an insertion port 704 at one end. A sealed bearing 705 is inserted into the insertion port 704, and the insertion shaft 702 is inserted into the sealed bearing 705. An installation shaft 706 is provided at the other end of the frustum-shaped rotating shaft 703. The installation shaft 706 is movably inserted into the extension box 29. Both the dehydration rotating shaft and the compression rotating shaft are fixedly fitted with spiral blades 707 that are tangent to the limiting frame group 4, the double shear unit ring group, and the machine housing 2. Both the spiral blades 707 and the compression spiral blades 707 have clearance notches 708 at their junctions. A reduction gearbox 709 is installed at one end of both the cylindrical rotating shaft 701 and the installation shaft 706. A motor 710 is installed on the reduction gearbox 709.

[0073] Each of the dewatering section and the compression section is equipped with a gearbox 709 and a motor 710 to drive rotation. When the dewatering section and the compression section rotate at different speeds, the cylindrical shaft 701 drives the insert shaft 702 to rotate in the insert 704 on the frustum-shaped shaft 703 through the sealed bearing 705, ensuring that the dewatering section and the compression section are coaxial. The spiral blades 707 are used to push the flocs to move axially. The clearance notch 708 is used to prevent the two spiral blades 707 from colliding with each other when rotating. By setting the clearance notch 708, the two spiral blades 707 can rotate at different speeds without interfering with each other.

[0074] As a preferred and further option, the guide assembly includes a limit key 823, which is disposed on the mounting shaft 706. A guide groove 824 is provided on the back pressure plate 821. The width of the guide groove 824 is the same as the width of the limit key 823, and the length of the guide groove 824 is greater than the length of the limit key 823.

[0075] By matching the width of the limit key 823 and the guide groove 824, when the mounting shaft 706 rotates, it drives the back pressure plate 821 to rotate as well. By the difference in length between the limit key 823 and the guide groove 824, when the telescopic component 835 is working, the back pressure plate 821 moves under the guidance of the guide groove 824 and the limit key 823.

[0076] As a preferred and further option, a guide rod 836 is installed on the back pressure plate 821, and the T-shaped scraper 81 is movably mounted on the guide rod 836 for guiding the T-shaped scraper 81. A limit block 837 is installed at one end of the guide rod 836 to limit the movement range of the T-shaped scraper 81.

[0077] Example 2:

[0078] A sludge treatment process includes the following steps:

[0079] Step 1: The submersible pump transports the sludge from the sludge tank to the metering tank in the flocculation mixing unit 1. Excess sludge is returned to the sludge tank through the overflow pipe. The polymer flocculant is added to the flocculation mixing tank by the metering dosing pump. The flocculation mixing tank is equipped with a stirring motor 710 to fully mix the sludge and flocculant. When the liquid level in the flocculation mixing unit 1 reaches the high limit, the sludge inlet pump and the dosing pump are automatically shut off. When the liquid level drops to the low limit, the submersible pump and the metering dosing pump are restarted.

[0080] Step 2: The mixed sludge flocs enter the working chamber between the casing 2, the multi-speed screw conveyor 7, and the double shear unit ring assembly through the pipe 3;

[0081] Step 3: The dewatering section and the compression section are each equipped with a 710 motor. The speed difference is adjusted according to the sludge concentration. When the concentration is low, the speed of the dewatering section is faster than that of the compression section to improve the pushing efficiency. When the concentration is high, the speeds are the same.

[0082] Step 4: The filtration channel is formed by the semi-fixed ring 5 and the double floating ring group 6. In the first motion state, the double floating ring group 6 moves and swings circumferentially between the adjacent semi-fixed rings 5. In the second motion state, the first moving ring 61 and the second moving ring 62 move and swing relative to each other. The first motion state and the second motion state together squeeze and dewater the sludge flocs. The filtrate finally enters the casing 2. Then the filtrate is returned to the raw water tank or enters the subsequent treatment system. The sludge cake is discharged from the discharge end of the casing 2 between the back pressure plate 821.

[0083] Step 5: The T-shaped scraper 81 on the self-cleaning back pressure device 8 always adheres to the wall of the discharge end of the machine box 2 under the action of the spring column 838. As the back pressure plate 821 rotates, it scrapes off the mud cake and residual sludge attached to the discharge end in real time.

[0084] Step 6: The dehydrated mud cake is directly transported to transportation or post-processing facilities by a screw conveyor for reuse.

[0085] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A sludge press screw press treatment device, comprising a flocculation mixing unit (1) and a casing (2), wherein the flocculation mixing unit (1) and the casing (2) are interconnected via a pipe (3), characterized in that, The chassis (2) is provided with a double shear unit ring assembly, and a multi-speed screw conveyor (7) is provided in the double shear unit ring assembly. The multi-speed screw conveyor (7) is movably inserted into the chassis (2) and the double shear unit ring assembly. The end of the chassis (2) away from the pipe (3) is the discharge end. A self-cleaning back pressure device (8) is provided on the chassis (2) and corresponding to the discharge end. The self-cleaning back pressure device (8) is connected to the multi-speed screw conveyor (7). The double shear unit ring group includes two opposing limiting frame groups (4), which are symmetrically spliced ​​together. Each opposing limiting frame group (4) is fitted with multiple semi-fixed ring bodies (5). A double floating ring group (6) is movably arranged between two adjacent semi-fixed ring bodies (5). The double floating ring group (6) is composed of a first moving ring body (61) and a second moving ring body (62). The double shear unit ring assembly has a first motion state and a second motion state; The first motion state is that the double floating ring group (6) moves between two adjacent semi-fixed ring bodies (5), and the second motion state is that the first moving ring body (61) and the second moving ring body (62) move relative to each other. The self-cleaning back pressure device (8) includes a back plate (82), on which a T-shaped scraper (81) is movably inserted via an elastic part (83), and the T-shaped scraper (81) is movably attached to the discharge end wall of the casing (2). The multi-speed screw conveyor (7) includes a dehydration section and a compression section, which are rotatably connected by a sealed bearing (705) and are movably inserted into the casing (2). The first moving ring body (61) includes a first ring plate (611), on which an inner ring protrusion (612) is provided. Multiple outer protrusions (613) are evenly distributed on the outer edge of the inner ring protrusion (612). The inner diameter of the inner ring protrusion (612) is the same as the inner diameter of the first ring plate (611). The second moving ring body (62) includes a second ring piece (621) with the same structure as the first ring piece (611). An outer ring protrusion (622) is provided on the wall surface of the second ring piece (621) opposite to the first ring piece (611). Multiple inner protrusions (623) are evenly distributed on the inner edge of the outer ring protrusion (622). The outer diameter of the outer ring protrusion (622) is the same as the outer diameter of the second ring piece (621).

2. The sludge press screw press treatment equipment according to claim 1, characterized in that, Each of the aforementioned limiting frame groups (4) includes two semi-circular frames (41). Connecting ears (42) are symmetrically arranged on the opposite walls of the two semi-circular frames (41). A first bolt (43) is movably inserted into the connecting ear (42). A first nut (44) is movably fitted onto the first bolt (43) through a thread. Multiple threaded rods (45) are evenly distributed on the two semi-circular frames (41). A second nut (46) is movably fitted onto both ends of each threaded rod (45) through a thread. Each semi-circular frame (41) is also provided with mounting holes (47) that match the chassis (2).

3. The sludge press screw press treatment equipment according to claim 1, characterized in that, Each of the semi-fixed rings (5) includes a semi-ring (51), which is tangent to the multi-speed screw (7). The outer edge of the semi-ring (51) is evenly distributed with a plurality of lugs (52) that match the threaded insert (45). Washers (53) are movably provided on both sides of the lugs (52).

4. The sludge press screw press treatment equipment according to claim 2, characterized in that, The back plate (82) includes a back pressure plate (821), which is movably mounted on the multi-speed auger (7) via a guide assembly. The T-shaped scraper (81) is movably inserted into the back pressure plate (821), and the T-shaped scraper (81) has a right-angle notch (822) that matches the chassis (2). The elastic part (83) includes a bending frame (831), which is mounted on a back pressure plate (821). A retaining ring (832) is fixedly fitted on the bending frame (831). The T-shaped scraper (81) is mounted on one end of the bending frame (831) via a spring column (838). A rotating ring seat (833) is fixedly mounted on the back pressure plate (821). A connecting ring (834) is movably inserted into the rotating ring seat (833). A telescopic component (835) is provided between the connecting ring (834) and the chassis (2).

5. The sludge press screw press treatment equipment according to claim 4, characterized in that, The chassis (2) includes a rectangular box (21). Multiple extension sleeves (22) are installed on the rectangular box (21) to match the mounting holes (47). Second bolts (23) are movably inserted into the rectangular box (21), the extension sleeves (22), and the mounting holes (47). A third nut (24) is movably fitted onto the second bolts (23) through threads. A feed pipe (25) is inserted into one side wall of the rectangular box (21). One end of the feed pipe (25) is a closed structure. The pipe (3) is connected to the feed pipe (25). A discharge pipe (26) is inserted on the other side wall of the rectangular box (21). The feed pipe (25) and the discharge pipe (26) are both attached to the semi-circular frame (41). A liquid-aggregating tank (27) is provided at the lower end of the rectangular box (21). A support (28) is provided on one side of the liquid-aggregating tank (27). The flocculation mixing unit (1) is provided on the support (28). An extension box (29) is provided on the rectangular box (21). The right-angle notch (822) matches the inner wall of the discharge pipe (26) and the outer wall of the rectangular box (21).

6. The sludge press screw press treatment equipment according to claim 1, characterized in that, The dehydration section includes a cylindrical rotating shaft (701), one end of which is provided with an insert shaft (702). The compression section includes a frustum-shaped rotating shaft (703), one end of which is provided with a socket (704). A sealed bearing (705) is inserted into the socket (704), and the insert shaft (702) is inserted into the sealed bearing (705). The other end of the frustum-shaped rotating shaft (703) is provided with a mounting shaft (706). The rotating shaft is installed on the extension box (29). The dehydration shaft and the compression shaft are both fixedly fitted with spiral blades (707) that are tangent to the control limit frame group (4), the double shear unit ring group and the machine box (2). The spiral blades (707) and the compression spiral blades (707) are provided with clearance notches (708). The cylindrical shaft (701) and the mounting shaft (706) are both equipped with a reduction gearbox (709) at one end. The reduction gearbox (709) is equipped with a motor (710).

7. The sludge press screw press treatment equipment according to claim 4, characterized in that, The guide assembly includes a limit key (823), which is disposed on the mounting shaft (706). A guide groove (824) is provided on the back pressure plate (821). The width of the guide groove (824) is the same as the width of the limit key (823), and the length of the guide groove (824) is greater than the length of the limit key (823).

8. The sludge press screw press treatment equipment according to claim 4, characterized in that, A guide rod (836) is installed on the back pressure plate (821), the T-shaped scraper (81) is movably fitted on the guide rod (836), and a limit block (837) is installed at one end of the guide rod (836).

9. A sludge treatment process, applied to the equipment as described in any one of claims 1-8, characterized in that, The following steps are included: Step 1: The submersible pump transports the sludge in the sludge tank to the metering tank in the flocculation mixing unit (1). Excess sludge is returned to the sludge tank through the overflow pipe. The polymer flocculant is added to the flocculation mixing tank by the metering dosing pump. The flocculation mixing tank is equipped with a stirring motor (710) to fully mix the sludge and flocculant. When the liquid level in the flocculation mixing unit (1) reaches the high limit, the sludge inlet pump and the dosing pump are automatically shut off. When the liquid level drops to the low limit, the submersible pump and the metering dosing pump are restarted. Step 2: The mixed sludge flocs enter the working chamber between the casing (2) and the multi-speed screw conveyor (7) and the double shear unit ring group through the pipe (3); Step 3: The dewatering section and the compression section are each equipped with a motor (710). The speed difference is adjusted according to the sludge concentration. When the concentration is low, the speed of the dewatering section is faster than that of the compression section to improve the pushing efficiency. When the concentration is high, the speeds are the same. Step 4: The filtration channel is formed by the semi-fixed ring (5) and the double floating ring group (6). In the first motion state, the double floating ring group (6) moves and swings in the circumferential direction between the adjacent semi-fixed rings (5). In the second motion state, the first moving ring (61) and the second moving ring (62) move and swing relative to each other. The first motion state and the second motion state together squeeze and dewater the sludge flocs. The filtrate finally enters the machine box (2). Then the filtrate flows back to the raw water tank or enters the subsequent treatment system. The sludge cake is discharged from the discharge end of the machine box (2) between the back pressure plate (821). Step 5: The T-shaped scraper (81) on the self-cleaning back pressure device (8) always adheres to the discharge end wall of the machine box (2) under the action of the spring column (838). As the back pressure plate (821) rotates, it scrapes off the mud cake and residual sludge attached to the discharge end in real time. Step 6: The dehydrated mud cake is directly transported to transportation or post-processing facilities by a screw conveyor for reuse.

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