Array roller back pressure belt type dehydrator

Abstract

The utility model discloses an array roller back pressure belt type dehydrator which comprises a rack, a plurality of guide rollers, upper filter cloth and lower filter cloth, a gravity dehydration section, a pre-pressing dehydration section, a squeezing dehydration section and a sludge outlet section are sequentially arranged in the conveying direction of sludge, and the array roller back pressure belt type dehydrator further comprises a deep dehydration assembly. The tensioning vibration assembly comprises a high-frequency vibrator and a plurality of grinding rollers, the grinding rollers are distributed in an annular array along the periphery of the dewatering roller, and a squeezing passage is formed between the grinding rollers and the peripheral wall surface of the dewatering roller; the squeezing and dewatering section comprises to-be-dewatered sludge and is arranged in the squeezing passage in a penetrating manner in a transmission manner, the plurality of grinding rollers act high-frequency vibration on the to-be-dewatered sludge, and the sludge generates high-frequency vibration, so that a wall breaking effect of cenobium occurs. High-frequency vibration is adopted for collecting a flocculating agent, so that the wall breaking effect of the sludge is generated, water contained in the sludge is separated out, then the sludge is extruded, filtered and discharged through a grinding roller, and the water content of a sludge cake is reduced to 65% or below.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, specifically to an array roller back pressure belt dewatering machine. Background Technology

[0002] Sludge dewatering is the last step in the general wastewater treatment process. The efficiency of sludge dewatering and the moisture content of the dewatered sludge cake not only have a significant impact on the entire wastewater treatment process and the smooth operation of the wastewater treatment plant, but also often directly affect the economic benefits of the wastewater treatment plant.

[0003] Deep dewatering of sludge is a popular sludge dewatering process with significant social and economic benefits. Methods for deep sludge dewatering include applying absolute high pressure to the dewatering equipment to squeeze water out of the sludge, and adding chemicals to the sludge beforehand to fully release the water before pressing it out. Some methods also include a drying process to further dry the sludge cake. Commonly used sludge dewatering equipment includes horizontal plate and frame filter presses, screw presses, belt dewatering machines, and centrifugal dewatering machines. While these are undoubtedly mature dewatering devices with their own advantages, they still have some drawbacks, such as high energy consumption, high cost, large footprint, and high operating and maintenance costs.

[0004] Belt sludge dewatering machines are devices used to treat sludge, commonly found in wastewater treatment plants, chemical plants, paper mills, and other similar locations. Traditional belt sludge dewatering machines often leave sludge cakes with high moisture content after processing. To address this issue, Chinese patent document CN116022989B discloses a high-dryness, high-pressure belt sludge dewatering machine. This machine adds a preliminary sludge pressing filter belt assembly to the traditional belt dewatering machine to remove free and interstitial water. Then, a modifier and a skeletonizing agent are sprayed onto the sludge in the mixing system. The modifier breaks down the protein-based cell walls, releasing bound and adsorbed water, reducing sludge viscosity, and improving dewatering efficiency. The skeletonizing agent alters the sludge's properties, enhancing dewatering properties, promoting organic matter hydrolysis, and reducing the difficulty of water treatment. Finally, the sludge is evenly distributed onto the high-pressure pressing filter belt device. By using more pressing rollers, a tighter roller arrangement, and a larger wrap angle, the sludge moisture content is further reduced. Although the belt sludge dewatering machine described above has a good dewatering effect and can achieve a sludge moisture content of 60%, its process is relatively complex and costly. It requires the addition of modifiers and skeletonizing agents for mixing, and also requires the addition of automatic feeding devices for skeletonizing agents, conveying devices (conveying pipes and conveying pumps), modifier feeding devices, and modifier conveying devices (conveying pipes and conveying pumps), resulting in a complex overall equipment structure, large footprint, and high maintenance costs. Utility Model Content

[0005] In view of at least one of the above-mentioned technical problems, the purpose of this utility model is to provide an array roller back pressure belt dewatering machine, which solves the problems of complex structure, large footprint and high cost of belt dewatering machines in the prior art.

[0006] The technical solution of this utility model is:

[0007] The purpose of this utility model is to provide an array roller back-pressure belt dewatering machine, including a frame, an upper filter cloth and a lower filter cloth respectively wound around a plurality of guide rollers above and below the frame, and along the sludge conveying direction, the portion of the lower filter cloth facing the upper filter cloth is sequentially provided with a gravity dewatering section, a pre-compression dewatering section, a pressing dewatering section and a sludge discharge section. The belt dewatering machine also includes a deep dewatering component disposed in the pressing dewatering section, the deep dewatering component including:

[0008] A dewatering roller, which is rotatably mounted within the frame;

[0009] The tensioning vibration assembly includes a high-frequency vibrator and several rollers. The rollers are arranged in a ring array around the outer periphery of the dewatering roller and form a pressing passage between the rollers and the outer periphery of the dewatering roller. The high-frequency vibrator transmits the high-frequency vibration waves generated during its operation to the rollers.

[0010] The pressing and dewatering section encloses the sludge to be dewatered, which has been pre-pressed into a solid state after being agglomerated into flocs by flocculant and is driven through the pressing passage. Several rollers press against the outer surface of the pressing and dewatering section corresponding to the lower filter cloth, and the pressing and dewatering section corresponding to the upper filter cloth wraps around the outer circumference of the dewatering rollers. The rollers apply high-frequency vibration to the sludge to be dewatered enclosed by the lower and upper filter cloths, causing the sludge to vibrate at high frequency, which in turn causes the bacterial cells in the sludge to break down.

[0011] Preferably, along the sludge conveying direction, the first included angle between the upper filter cloth and the lower filter cloth at the pre-compression dewatering section gradually decreases, the second included angle between the upper filter cloth and the lower filter cloth at the gravity dewatering section also gradually decreases, and the third included angle between the upper filter cloth and the lower filter cloth at the sludge discharge section gradually increases, and the maximum value of the first included angle is less than the minimum value of the second included angle.

[0012] Preferably, the axial ends of the plurality of rollers are connected in series by chain plates, and the tensioning vibration assembly further includes a tensioning member. The high-frequency vibrator transmits high-frequency vibration waves to the plurality of rollers through the tensioning member. The tensioning member includes:

[0013] Two tensioning screws are provided. The two outermost rollers of the plurality of rollers are each connected to one of the tensioning screws. Any one of the tensioning screws is movably inserted into a tensioning guide tube inside a first crossbeam fixed above the plurality of rollers.

[0014] The load-bearing crossbeam has its bottom end elastically supported on the first crossbeam by at least two inflatable and deflated vibration-damping airbags, and the high-frequency vibrator is fixed on the upper surface of the load-bearing crossbeam.

[0015] The ends of the two tensioning screws that are furthest from the rollers to which they are connected pass through the load-bearing beam and are each fixed by a tensioning nut.

[0016] Preferably, the dewatering roller includes a hollow roller body with an inner cavity and a spindle disposed on the roller body along the axis of the roller body. The two ends of the spindle extend outward from the roller body, and the outer circumferential surface of the roller body is provided with a plurality of pressing bars that extend radially outward at intervals along its circumference. A guide groove is formed between any two adjacent pressing bars, and the bottom surface of the guide groove has a drain hole that penetrates and communicates with the inner cavity of the roller body. The guide groove extends along the axial direction of the roller body, and the end plates at both ends of the roller body are respectively provided with a plurality of drain ports that communicate with the inner cavity.

[0017] The roller body is connected to the drive motor via the mandrel and is driven by the drive motor to rotate around the axis of the mandrel. The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the mandrel.

[0018] Preferably, both the upper and lower filter cloths are provided with tensioning devices. The tensioning device corresponding to the upper filter cloth is fixed on the second crossbeam at the upper end of the frame, and the tensioning device corresponding to the lower filter cloth is fixed on the third crossbeam at the lower end of the frame. Each tensioning device includes a tensioning roller and a tensioning cylinder connected to the tensioning roller. The axial ends of each tensioning roller are respectively slidably disposed in the first guide frame fixed on their respective crossbeams.

[0019] Preferably, both the upper and lower filter cloths are provided with a correction device. Each correction device includes a correction roller, a correction cylinder connected to the correction roller, and a detection device for detecting deviation of the upper or lower filter cloth. Each correction roller has a first pin hole that penetrates radially at one axial end and a second pin hole that penetrates radially and extends axially at the other axial end. The end of the correction roller with the first pin hole is connected to a sliding bearing seat by a positioning pin, and the end of the correction roller with the second pin hole is connected to another sliding bearing seat by a sliding pin. The two sliding bearing seats are respectively connected to a correction cylinder and are each slidably mounted in a second guide frame fixed on the machine frame. The positioning pin is rotatably connected to the first pin hole relative to the correction roller, and the sliding pin is rotatably mounted in the second pin hole relative to the correction roller and slidably mounted in the second pin hole along the extension direction of the second pin hole. Each of the upper and lower filter cloths is provided with a detection device on both sides corresponding to the position of their respective correction rollers, and each detection device is electrically connected to the correction cylinder on its corresponding side.

[0020] Preferably, it further includes a feeding and spreading device disposed at one end of the frame for mixing and conveying the sludge to be dewatered and the flocculant to the feed end of the lower filter cloth, the feeding and spreading device comprising:

[0021] The feed pipe is in the shape of an inverted L or a horizontal inverted T, with a feed inlet and a dosing inlet at the lower end and a discharge outlet at the upper end.

[0022] A mixer, which is rotatably disposed within the feed pipe;

[0023] A fabric feeding mechanism, located at the outlet of the feed pipe, includes a fabric feeding hopper extending downward at an incline from the outlet, at least two overflow weirs spaced apart on the bottom surface of the fabric feeding hopper along the discharge direction, and a fabric feeding adjustment assembly located at the outlet of the fabric feeding hopper. The fabric feeding hopper gradually increases in width along the discharge direction. The middle position of any overflow weir is opposite the outlet, and the height of any overflow weir gradually decreases from the middle to both sides along its length. The height of the overflow weir gradually decreases along the discharge direction. The fabric feeding adjustment assembly includes a fabric feeding adjustment weir gate, a counterweight adjustment rod, and a first counterweight block. The upper two ends of the fabric feeding adjustment weir gate are rotatably connected to the two side walls of the fabric feeding hopper via a pivot, and the bottom edge contacts the bottom surface of the fabric feeding hopper. A counterweight adjustment rod is connected to each end of the pivot, and each counterweight adjustment rod has a first counterweight block that is movable and locked after reaching a predetermined position.

[0024] Preferably, it further includes a sludge unloading device disposed at the other end of the frame, the sludge unloading device comprising:

[0025] Supports, which are fixed to the frame;

[0026] An upper discharge roller is rotatably disposed at the upper end of the support, and the upper filter cloth passes around the upper discharge roller and extends upward;

[0027] The lower discharge roller is rotatably disposed at the lower end of the support and opposite to the upper discharge roller, and the lower filter cloth passes around the lower discharge roller and extends downward;

[0028] The upper scraper is mounted on an upper blade holder rotatably connected at one end to the support and facing the upper filter cloth on the upper discharge roller;

[0029] The lower scraper is mounted on a lower blade holder rotatably connected at one end to the support and faces the lower filter cloth on the lower discharge roller;

[0030] A force-applying device, which is mounted on the support and is used to apply a force to the upper and lower blade holders, causing the upper and lower scrapers on them to move closer to the upper and lower filter cloths, respectively.

[0031] Preferably, the force-applying device includes a lever horizontally arranged between the upper and lower unloading rollers and rotatably connected to an outwardly protruding support plate at the end of the support away from the frame; a telescopic upper pull rod with one end rotatably connected to the upper blade holder and the other end rotatably connected to the lever on one side of the rotation fulcrum; a telescopic lower pull rod with one end rotatably connected to the lower blade holder and the other end rotatably connected to the lever on the other side of the rotation fulcrum; and a second counterweight adjustablely mounted on the lever and locked when the lever is in a horizontally balanced state. The distance from one end of the lever to its rotation fulcrum is different from the distance from the other end to its rotation fulcrum, and the second counterweight is located at the end of the lever farther from its rotation fulcrum.

[0032] The force-applying device includes a support plate horizontally arranged between the upper discharge roller and the lower discharge roller and fixedly connected to the support, an upper force-applying spring with one end connected to the support plate and the other end connected to the other end of the upper knife holder via an upper connecting rod, and a lower force-applying spring with one end connected to the support plate and the other end connected to the other end of the lower knife holder via a lower connecting rod. The upper force-applying spring and the lower force-applying spring respectively apply biasing forces toward the upper filter cloth and the lower filter cloth to the upper knife holder and the lower knife holder, respectively.

[0033] Preferably, the upper filter cloth and the lower filter cloth are further provided with filter cloth cleaning devices, and the upper filter cloth and the lower filter cloth pass through their respective corresponding filter cloth cleaning devices in a driving manner. Each filter cloth cleaning device is provided with a plurality of nozzles arranged along the width direction of its respective filter cloth for spraying cleaning water; and / or

[0034] The frame is provided with a downwardly extending water receiving hopper below the gravity dewatering section and the pre-compression dewatering section corresponding to the lower filter cloth. The bottom of the frame is also provided with a water receiving trough below the dewatering roller. The lower end of the water receiving hopper extends to the top of the water receiving trough.

[0035] Compared with the prior art, the advantages of this utility model are:

[0036] This utility model discloses an array roller back-pressure belt dewatering machine, which uses high-frequency vibration to aggregate flocculants, causing a cell-wall breaking effect in the sludge and separating the entrained water. The water is then discharged through roller compression and filtration, reducing the moisture content of the sludge cake to below 65%. It features high dewatering efficiency, simple structure, compact size, affordability, and low operation and maintenance costs, making it a preferred dewatering equipment for wastewater treatment plants. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0038] Figure 1 This is a side view of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model;

[0039] Figure 2 This is a schematic diagram of the deep dewatering component of the array roller back pressure belt dewatering machine according to an embodiment of the present invention;

[0040] Figure 3 This is a side view of the dewatering roller of the deep dewatering component of the array roller back pressure belt dewatering machine according to an embodiment of the present invention.

[0041] Figure 4 This is a schematic diagram of the tensioning vibration assembly of the deep dewatering component of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model.

[0042] Figure 5 This is a side view of the correction device of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model.

[0043] Figure 6 for Figure 5 Schematic diagram of the cross-section along the AA direction;

[0044] Figure 7 This is a side view of the feeding and feeding device of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model.

[0045] Figure 8 This is a schematic diagram of the main structure of the feeding and spreading device of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model;

[0046] Figure 9This is a schematic diagram of one structure of the sludge unloading device of the array roller back pressure belt dewatering machine according to an embodiment of the present utility model.

[0047] Figure 10 This is a schematic diagram of another structure of the sludge unloading device of the array roller back pressure belt dewatering machine according to an embodiment of the present invention.

[0048] The components are as follows: 10. Frame; 11. Water receiving trough; 12. First crossbeam; 121. Tensioning guide tube; 13. Second crossbeam; 14. Third crossbeam; 15. Second guide frame; 151. Slide chute; 20. Upper filter cloth; 30. Lower filter cloth; 31. Gravity dewatering section; 32. Pre-compression dewatering section; 33. Press dewatering section; 34. Sludge discharge section; 40. Feeding and spreading device; 41. Feed pipe; 411. Feed inlet; 412. Chemical dosing port; 413. Discharge port; 42. Mixer; 43. Spreading mechanism. ; 431. Feed hopper; 432. Overflow weir wall; 433. Feed adjustment assembly; 4331. Feed adjustment weir gate; 4332. Counterweight adjustment rod; 4333. First counterweight block; 50. Sludge unloading device; 51. Support; 52. Upper unloading roller; 53. Lower unloading roller; 54. Upper cutter holder; 55. Lower cutter holder; 56. Upper scraper; 57. Lower scraper; 58a. Force-applying device; 581a. Lever; 582a. Upper pull rod; 583a. Lower pull rod; 584a. Second counterweight block; 5 8b. Force-applying device; 581b. Upper force-applying spring; 582b. Lower force-applying spring; 583b. Upper connecting rod; 584b. Lower connecting rod; 59. Support plate; 60. Deep dewatering assembly; 61. Dewatering roller; 611. Roller body; 61110. End plate; 6111. Pressing grid; 612. Mandrel; 613. Guide groove; 614. Drainage hole; 615. Drain outlet; 62. Tensioning vibration assembly; 621. Grinding roller; 6211. Chain plate; 622. High-frequency vibrator; 623. Tensioning components; 6231, tensioning screw; 6232, tensioning nut; 6233, load-bearing crossbeam; 6234, vibration-damping tensioning airbag; 63, front-end guide roller of the press; 64, rear-end guide roller of the press; 70, correction device; 71, correction roller; 710, sliding bearing seat; 711, first pin hole; 712, second pin hole; 713, positioning pin; 714, sliding pin; 72, correction cylinder; 80, tensioning device; 90, filter cloth cleaning device; 100, guide roller; 110, water receiving hopper. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0050] See Figures 1 to 10 This utility model discloses an array roller back-pressure belt dewatering machine, comprising a frame 10, an upper filter cloth 20, a lower filter cloth 30, several guide rollers 100, a feeding and spreading device 40, a deviation correction device 70, a tensioning device 80, a deep dewatering assembly 60, a water receiving hopper 110, a water receiving trough 11, a filter cloth cleaning device 90, and a sludge unloading device 50. The frame 10 is a cuboid frame structure formed by multiple crossbeams and longitudinal beams, consisting of upper and lower parts, with the upper part being longer than the lower part. The feeding and spreading device 40 and the sludge unloading device 50 are respectively located at both ends of the upper part of the frame 10. Figure 1 As shown, the left and right ends are connected, with the feeding and spreading device 40 used to mix the sludge to be dewatered and the flocculant and then convey it to the feeding end of the lower filter cloth 30, and the sludge unloading device 50 used to scrape off the sludge cake that adheres to the upper filter cloth 20 and the lower filter cloth 30 after dewatering. It should be noted that in this embodiment, the extension length of the lower filter cloth 30 along the length of the frame 10 is longer than the extension length of the upper filter cloth 20 along the length of the frame 10. More specifically, the left end of the upper filter cloth 20 is flush with the left end of the lower filter cloth 30, and the right end of the lower filter cloth 30 protrudes further to the right than the right end of the upper filter cloth 20, so that the right end of the lower filter cloth 30 can be opposite to the discharge end of the feeding and spreading device 40, that is, the right end of the lower filter cloth 30 protrudes outward to form the feeding end. Several guide rollers 100 are distributed on the upper and lower parts of the frame 10, respectively. The specific arrangement is not described or limited. The guide rollers 100 are configured to form a closed-loop transmission structure for the upper filter cloth 20 and the lower filter cloth 30, allowing for changes in their running direction, thus ensuring a reasonable structure and reliable operation of the dewatering machine. The upper filter cloth 20 is wrapped around several guide rollers 100 on the upper part of the frame 10, and the lower filter cloth 30 is wrapped around several guide rollers 100 on the lower part of the frame 10. During operation, one side of the upper filter cloth 20 and the opposite side of the lower filter cloth 30 always face each other and are close together. Specifically, the lower surface of the lower section of the upper filter cloth 20 and the upper surface of the upper section of the lower filter cloth 30 always face each other and are close together, thereby allowing for the compression and dewatering of the sludge between them. To achieve effective dewatering, in this embodiment, the sludge conveying direction (…) Figure 1(From right to left) The working surfaces, where the upper filter cloth 20 and the lower filter cloth 30 face each other, are sequentially divided into four sections: gravity dewatering section 31, pre-compression dewatering section 32, pressing dewatering section 33, and sludge discharge section 34. In gravity dewatering section 31, only the lower filter cloth 30 participates; the upper filter cloth 20 does not. However, as the upper filter cloth 20 approaches the pre-compression dewatering section 32, it gradually moves closer to the lower filter cloth 30. For ease of description, this section of the upper filter cloth 20 is also referred to as gravity dewatering section 31. In sludge discharge section 34, the lower filter cloth 30 is the primary component, with the upper filter cloth 20 playing a secondary role. In sludge discharge section 34, most of the sludge cake rests on the lower filter cloth 30 due to gravity. However, due to the compression effect of the preceding pressing dewatering section 33, some of the sludge cake remains on the upper filter cloth 20. Both the upper filter cloth 20 and the lower filter cloth 30 are equipped with a tensioning device 80 and a correction device 70. The tensioning devices 80 on the upper filter cloth 20 and the lower filter cloth 30 have the same structure, and the correction devices 70 on the upper filter cloth 20 and the lower filter cloth 30 have the same structure, only their positions differ. The tensioning device 80 is used to apply tension to the upper filter cloth 20 and the lower filter cloth 30 so that the filter cloths can be tightened, thereby applying pressure to the sludge to be dewatered between the upper filter cloth 20 and the lower filter cloth 30 during the pressing and dewatering section 33 for dewatering. The correction device 70 is used to correct the position of the upper filter cloth 20 and the lower filter cloth 30 to prevent them from deviating and affecting the dewatering effect. The deep dewatering component 60 is used to complete the final dewatering treatment, reducing the moisture content of the dewatered cake to below 65%. The water receiving hopper 110 is used to receive water filtered through the upper filter cloth 20 and lower filter cloth 30, specifically through the gravity dewatering section 31. The material receiving trough is used to receive water flowing down from the material receiving hopper and water filtered through the upper filter cloth 20 and lower filter cloth 30, specifically through the pressing dewatering section 33. The filter cloth cleaning device 90 is located on the circulation path of the upper filter cloth 20 and lower filter cloth 30, specifically behind the sludge unloading device 50 and in front of the feed end, and is used to wash away residual sludge on the upper filter cloth 20 and lower filter cloth 30. The structure of the upper filter cloth 20 and lower filter cloth 30 is not described or limited, and can be the filter cloth, filter screen, or filter belt of a conventional belt dewatering machine.

[0051] The belt dewatering machine in this embodiment of the invention, compared to existing belt dewatering machines, has its main improvement, and that is, its inventive point, in the deep dewatering component 60. Furthermore, improvements have also been made to the feeding and distributing device 40 and the unloading device 50. Here, the applicant will first describe the deep dewatering component 60. For example… Figures 1 to 3 As shown, the deep dehydration component 60 in this embodiment of the present invention mainly comprises two parts: a dehydration roller 61 and a tensioning vibration component 62. Wherein, as... Figure 3As shown, the dewatering roller 61 includes a roller body 611 and a spindle 612. The roller body 611 is a roller with a relatively large outer diameter, such as 750 mm. A spindle 612 is provided at the center of the roller, extending axially to both ends. One end of the spindle 612 is connected to a drive motor, preferably a drive geared motor. The drive motor drives the roller body 611 to rotate around the axis of the spindle 612, thereby driving the upper filter cloth 20 and lower filter cloth 30 surrounding the outer circumference of the dewatering roller 61 to achieve dewatering, mud unloading, washing, and circulation. In this embodiment of the utility model, the complex structure of the current belt dewatering machine using multiple rollers for repeated pressing is abandoned, and replaced with the above-mentioned large-diameter dewatering roller 61, which has a simple structure and is easier to form a large wrap angle, increasing the pressing and dewatering area. The roller body 611 has a plurality of drainage holes 614 spaced apart on its outer surface, and any one of the drainage holes 614 extends along the axial direction of the roller body 611. The roller body 611 is hollow, that is, an inner cavity is formed between the inner peripheral wall of the roller body 611 and the outer peripheral wall of the spindle 612. The inner cavity is used to contain water flowing in through the drainage holes 614. In order to facilitate the drainage of water, a plurality of drainage outlets 615 communicating with the drainage holes 614 and the inner cavity are also provided on the end plates 61110 at both ends of the roller body 611 in the axial direction. Furthermore, in order to increase the friction between the dewatering roller 61 and the upper filter cloth 20 and the lower filter cloth 30 to facilitate transmission, a number of pressing grids 6111 extending outward in the radial direction are provided at intervals on the outer peripheral wall of the roller body 611. Any two adjacent pressing grids 6111 are located on both sides of a drain hole 614, that is, a guide groove 613 is defined between any two adjacent pressing grids 6111. The drain hole 614 is opened on the bottom surface of the guide groove 613. The upper filter cloth 20 and the lower filter cloth 30 wrap around the surface of the pressing grids 6111 of the roller body 611. Since the diameter of the roller body 611 is large, the upper filter cloth 20 and the lower filter cloth 30 form a larger wrap angle after clamping the dewatered sludge, resulting in a larger pressing and dewatering area, which is more conducive to improving the dewatering effect. It should be noted that, in order to make the upper filter cloth 20 and lower filter cloth 30 at the deep dewatering component 60 wrap around the dewatering roller 61 and form a larger wrap angle and pressing force, a guide roller 100 is provided on each side of the dewatering roller 61. (The functions of these two guide rollers 100 are not exactly the same as those of the other guide rollers 100. The main purpose of the other guide rollers 100 is to guide and change direction, while the purpose of these two guide rollers 100 is to make the upper filter cloth 20 and lower filter cloth 30 form a larger wrap angle and apply pressing force on the dewatering roller 61. For ease of description and distinction, these two guide rollers 100 are described as the front-end guide roller 63 and the rear-end guide roller 64 of the press according to the sludge conveying direction.)It should be noted that in this embodiment of the present invention, the vertical lines (not shown) passing through their respective axes of the front-end guide roller 63 and the rear-end guide roller 64 fall inside the dewatering roller 61. That is to say, the horizontal distance between the axis of the front-end guide roller 63 or the rear-end guide roller 64 and the axis of the dewatering roller 61 is less than the radius of the dewatering roller 61. This causes the upper filter cloth 20 and the lower filter cloth 30, which enclose the sludge to be dewatered, to form an inverted Ω shape when passing through the pressing passage, creating a large wrapping angle. As for the cross-sectional shape of the pressing grid 6111, it is not described or limited. In this embodiment, an example is shown. Figure 3 The diagram shows a square shape. Regarding the drain outlets 615, in this embodiment, they are preferably arranged circumferentially along the outer periphery of the end plate 61110, and their shape is preferably semi-circular or arc-shaped. The size and number are not particularly limited; those skilled in the art can select and design them according to actual needs. (Exemplary example follows.) Figure 3 There are 8 in total. In the embodiments of this utility model, some guide rollers 100 have the same diameter as the front guide roller 63 and the rear guide roller 64 of the press, while the diameter of some guide rollers 100 is smaller than the diameter of the front guide roller and the rear guide roller 64 of the press. The specific details are not described or limited, and those skilled in the art can select and design according to actual needs.

[0052] The deep dehydration component 60 of this utility model embodiment is disposed as follows: Figure 1 Above the water inlet 11 at the lower left end of the frame 10 shown. For the tensioning vibration assembly 62, as... Figure 2 and Figure 4As shown, the assembly includes several rollers 621, a tensioning member 623, and a high-frequency vibrator 622. The diameter of the rollers 621 is much smaller than that of the dewatering roller 61; this is not specifically limited, but can be one-twentieth the diameter of the dewatering roller 61, etc. The rollers 621 are wrapped around the outer circumference of the dewatering roller 61 by the tensioning member 623, with a gap between them. This gap is designed to allow the upper filter cloth 20 and lower filter cloth 30, which have solidified after passing through the gravity dewatering section 31 and the pre-compression dewatering section 32, to pass through an arc-shaped pressing channel (not shown). The tensioning member 623 can adjust the gap between the rollers 621 and the dewatering roller 61, i.e., the pressing channel, thereby adjusting the pressing force. The number of rollers 621 is not described or limited; for example, twelve rollers 621 evenly distributed around the bottom outer circumference of the dewatering roller 61 are acceptable. The high-frequency vibrator 622 is a conventional high-frequency vibrator 622 available on the market, such as a high-frequency vibration motor, with a selectable frequency of 50Hz. When the upper filter cloth 20 and the lower filter cloth 30, which contain solid sludge to be dewatered, pass through the pressing passage, the pressing and dewatering section 33 of the upper filter cloth 20 is wrapped around the outer periphery of the dewatering roller 61, while the lower filter cloth 30 is crushed by several rollers. The high-frequency vibrator 622 transmits high-frequency vibration to several rollers 621 through the tensioning component 623. This causes the rollers 621 to apply a crushing force to the solid sludge to be dewatered sandwiched between the lower filter cloth 30 and the upper filter cloth 20 while simultaneously transmitting high-frequency vibration to the solid sludge to be dewatered between the filter cloths. The sludge generates high-frequency vibration, and the bacterial flocs in the sludge undergo a cell-wall breaking effect under the action of high-frequency vibration, causing the water trapped in the bacterial flocs to be released. Thus, dewatering is achieved through the crushing force and the secondary action of vibration. Combined with the action of flocculant in the gravity dewatering section 31, the sludge that has agglomerated undergoes preliminary dewatering in the gravity dewatering section 31 due to gravity. That is, after the flocculant, the sludge undergoes primary dewatering in the gravity dewatering section 31, secondary dewatering in the pre-compression dewatering section 32, and tertiary dewatering through the crushing of the dewatering rollers 61 and rollers 621 and the cell-wall breaking effect of high-frequency vibration, which greatly improves the dewatering effect. Testing revealed that the dewatering machine of this embodiment reduces the moisture content of the dewatered cake to below 65% after the final dewatering process. More specifically, as... Figure 4 As shown, several grinding rollers 621 are connected in series via chain plates 6211, which differs from conventional chain structures. In conventional chains, the shaft at the chain link generally does not protrude beyond the chain plate 6211, while the grinding rollers 621 in this application protrude beyond the chain plate 6211, meaning the diameter of the grinding rollers 621 is larger than the width of the chain plate 6211. To ensure that the several grinding rollers 621 can press firmly onto the filter cloth in the pressing passage and apply a compressive force to the sludge to be dewatered between the filter cloths, in this embodiment of the invention, the several grinding rollers 621 are fixed by a tensioning member 623. Regarding the tensioning member 623, as... Figure 4As shown, it includes two tensioning screws 6231, a load-bearing crossbeam 6233, and two tensioning nuts 6232. Among the plurality of rollers 621, the two outermost rollers 621 each have an outwardly extending tensioning screw 6231, and each tensioning screw 6231 has a threaded section at its outer end. To facilitate the fixing of the tensioning screws 6231, as... Figure 2 As shown, a crossbeam (described as the first crossbeam 12 for easy distinction) is located above the mandrel 612 in the middle of the dewatering roller 61 on the frame 10. Two through holes (not shown) are formed on the first crossbeam 12. Each through hole contains a tension guide tube 121. The outer end of each tension screw 6231 is movably inserted into the corresponding tension guide tube 121, with a threaded portion extending beyond the tension guide tube 121 and passing through and extending to the force-bearing crossbeam 6233 located above the first crossbeam 12. The threaded portion is fixed to the force-bearing crossbeam 6233 by a tension nut 6232. The bottom end of the force-bearing crossbeam 6233 is connected by at least two (… Figure 4 Two inflatable and deflated vibration-damping tensioning airbags 6234 are elastically supported on the first crossbeam 12. The crushing force can be adjusted by adjusting the tensioning nut 6232 to extend the tensioning screw 6231 above the force-bearing crossbeam 6233 and / or by adjusting the inflation amount of the vibration-damping tensioning airbags 6234. A high-frequency vibrator 622 is fixed on the force-bearing crossbeam 6233. The high-frequency vibration generated by the high-frequency vibrator 622 is transmitted to several rollers 621 through the two tensioning screws 6231. The rollers 621 then apply the high-frequency vibration to the bacterial clusters in the sludge to be dewatered, which are sandwiched between the pressing and dewatering sections 33 of the upper filter cloth 20 and the lower filter cloth 30, causing the bacterial clusters to undergo a cell wall breaking effect and release water from the cell walls. The material of the vibration-damping tensioning airbags 6234 is not described or limited, but the structure is exemplified as follows: Figure 4 The diagram shows three stacked, bead-like vesicle structures.

[0053] For gravity dewatering section 31, pre-compression dewatering section 32, pressing dewatering section 33, and mud discharge section 34, such as Figure 1 and Figure 2 As shown, in the gravity dewatering section 31, the upper filter cloth 20 and the lower filter cloth 30 partially face each other, and the facing portions are along the sludge conveying direction, i.e., the direction from feed to discharge. Figure 1 As shown in the right-to-left direction, the upper filter cloth 20 gradually approaches the lower filter cloth 30, that is, an angle is formed between the upper filter cloth 20 and the lower filter cloth 30. For ease of description and distinction, this angle is referred to as the second angle. Figure 2 In the example shown, β). In the pre-compression dewatering section 32, similarly, the upper filter cloth 20 gradually approaches the lower filter cloth 30, that is, an angle is also formed between the upper filter cloth 20 and the lower filter cloth 30. For ease of description and distinction, this angle is described as the first angle ( Figure 2(Example α). Similarly, an angle is also formed between the upper filter cloth 20 and the lower filter cloth 30 in the sludge discharge section 34, which is implemented as a third angle ( Figure 2 In the example, γ), however, in the sludge discharge section 34, the upper filter cloth 20 and the lower filter cloth 30 gradually move away from each other, that is, the third included angle gradually increases. As for the first included angle α, the second included angle β, and the third included angle γ, the minimum value of the second included angle β is greater than the maximum value of the first included angle α. No specific description or limitation is given, but for example, the minimum value of the second included angle β is twice the maximum value of the first included angle α, and so on. A guide roller 100 is provided between the gravity dewatering section 31 and the pre-compression dewatering section 32 of the upper filter cloth 20. The second included angle is jointly defined by the guide roller 100, the guide roller 100 in front, and the pressing front guide roller 63 behind. The first included angle is jointly defined by the pressing front guide roller 100, the guide roller 100 in front, and the dewatering roller 61 behind. As for the third included angle, there is no limitation. Optionally, the minimum value of the third included angle must be greater than the minimum value of the first included angle and the maximum value of the third included angle must be greater than the maximum value of the first included angle. There is no special limitation. For example, the maximum value of the third included angle may be two or three times the maximum value of the first included angle, etc. In gravity dewatering section 31, dewatering relies entirely on the gravity of the sludge flocs formed by the flocculant. Therefore, the upper filter cloth 20 does not apply pressure in this section. However, in pre-compression dewatering section 32, the upper filter cloth 20 requires pressure. Consequently, the gap between the upper filter cloth 20 and the lower filter cloth 30 is smaller than that in gravity dewatering section 31. In pressing dewatering section 33, the upper filter cloth 20 and the lower filter cloth 30 are parallel without any angle. The angle is increased in sludge discharge section 34 to facilitate the separation of the upper filter cloth 20 and the lower filter cloth 30. Since the pressure applied between them in pressing dewatering section 33 is relatively large, a smaller angle in sludge discharge section 34 would hinder their separation and thus make sludge unloading difficult.

[0054] In this embodiment of the utility model, the water receiving hopper 110 is along... Figure 1 The water receiving hopper 110, extending downwards from right to left, is located at the lower right end of the frame 10, below the gravity dewatering section 31 and the pre-pressure dewatering section 32 of the lower filter cloth 30. The lower end of the water receiving hopper 110 extends above the water receiving trough 11, which discharges the received water out of the dewatering machine. The structure of the water receiving hopper 110 is not specifically described and can be a conventional U-shaped structure. Similarly, the structure of the water receiving trough 11 is not described or limited and can be a U-shaped trough or an arc-shaped trough. The width of the water receiving hopper 110 should not be less than the width of the lower filter cloth 30 to ensure that the water removed in the gravity dewatering section 31 and the pre-pressure dewatering section 32 can fall smoothly into the water receiving hopper 110.

[0055] In this embodiment of the invention, the correction devices 70 on the upper filter cloth 20 and the lower filter cloth 30 are structurally identical, differing only in their placement. For example, the correction device 70 corresponding to the upper filter cloth 20 is located on the top beam at the top of the frame 10, while the correction device 70 corresponding to the lower filter cloth 30 is located on the bottom beam. Any correction device 70 of this invention, such as... Figure 1 As shown, the device includes a correction roller 71, a correction cylinder 72, and a detection device (not shown). The correction roller 71 is a movable, rubber-coated roller designed to increase friction. The correction cylinders 72 are respectively located at both axial ends of the correction roller 71, used to drive either axial end of the correction roller 71 to move and achieve correction adjustment. The detection device is located on the outer sides of both axial ends of the correction roller 71 to detect whether there is a positional shift on either side of the upper filter cloth 20 or the lower filter cloth 30 in the width direction. The detection device is a conventional photoelectric detector or similar component available on the market; its specific structure and working principle are not described or limited, and can be easily understood and implemented by those skilled in the art. The correction cylinder 72 is exemplarily a conventional hydraulic cylinder. To achieve the movable adjustment and correction operation of the correction roller 71, in this embodiment of the invention, the axial ends of the correction roller 71 have structural differences; more specifically, for example... Figure 6 As shown, one end of the alignment roller 71 has a radially penetrating circular hole, which is implemented as a first pin hole 711. The other end of the alignment roller 71 has a radially penetrating elongated hole extending along the axis of the alignment roller 71, which is implemented as a second pin hole 712. That is, the width of the second pin hole 712 is larger than that of the first pin hole 711. A positioning pin 713 is inserted into the first pin hole 711, and the alignment roller 71 can rotate around the axis of the positioning pin 713. A sliding pin 714 is inserted into the second pin hole 712, and the alignment roller 71 can rotate and move relative to the sliding pin 714. In other words, the width of the second pin hole 712 is greater than the outer diameter of the sliding pin 714. Both ends of the positioning pin 713 and the sliding pin 714 are respectively fixed to the sliding bearing seat 710 (described here as the first sliding bearing seat to distinguish it from the sliding bearing seat of the tensioning device 80), that is, the axial ends of the straightening roller 71 are respectively slidably connected to the second guide frame 15 fixed on the top or bottom beam of the frame 10 through the sliding bearing seat 710. For example, Figure 5 As shown, a slider structure (not shown) protruding outwards can be provided on the sliding bearing seat 710, while an inwardly recessed groove 151 is formed in the second guide frame 15. Alternatively, an inwardly recessed groove 151 can be formed on the sliding bearing seat 710, while an outwardly protruding slider structure (not shown) that slides in cooperation with the groove 151 is provided in the second guide frame 15. It should be noted that in this embodiment of the invention, the sliding bearing seat 710 of the correcting roller 71 moves horizontally relative to the frame 10, that is, it moves left and right as shown in the figure.

[0056] In this embodiment of the invention, the tensioning devices 80 on the upper filter cloth 20 and the lower filter cloth 30 have the same structure, differing only in their position on the frame 10. In this embodiment, the tensioning device 80 corresponding to the upper filter cloth 20 is located at the upper right of the frame 10, and the tensioning device 80 corresponding to the lower filter cloth 30 is located at the lower right of the frame 10. To facilitate the placement of the tensioning devices 80 corresponding to the upper filter cloth 20 and the lower filter cloth 30, as follows... Figure 1 As shown, the frame 10 is provided with two horizontal beams arranged parallel to each other. For ease of description and distinction, the horizontal beam fixed to the tensioning device 80 corresponding to the upper filter cloth 20 is described as the second horizontal beam 13, and the horizontal beam fixed to the tensioning device 80 corresponding to the lower filter cloth 30 is described as the third horizontal beam 14. In this embodiment, the first horizontal beam 12 is lower than the third horizontal beam 14 in height. For the structure of any tensioning device 80, it includes a tensioning roller (not shown) and a tensioning cylinder (not shown). In this embodiment, the structure of the tensioning roller is slightly different from that of the correction roller 71 of the correction device 70. Both ends of the tensioning roller have round holes, which are fixed to the sliding bearing seat (for distinction, the sliding bearing seat is described here as the second sliding bearing seat, not shown) by positioning pins 713. The second sliding bearing seat is slidably connected in the first guide frame (not shown) fixed on the second horizontal beam 13 and the third horizontal beam 14 respectively. The tensioning cylinder can be a conventional hydraulic cylinder available on the market. The tensioning roller applies a pre-tension to the filter cloth, causing it to adhere tightly to the surfaces of the rollers, including the guide roller 100, the correction roller 71, the dewatering roller 61, and the sludge discharge rollers (upper discharge roller 52 and lower discharge roller 53). This keeps the upper filter cloth 20 and the lower filter cloth 30 taut, applying a squeezing effect to the sludge sandwiched between the upper and lower filter cloths 30. At the same time, it can effectively achieve the correction action, the guiding action, and the transmission, i.e., be driven.

[0057] The feeding and feeding device 40 of this embodiment of the utility model is set as follows: Figure 1 The right end of the frame 10 shown is intended for conveying the mixture of sludge and flocculant to the feed end of the lower filter cloth 30. Specifically, its structure is as follows: Figure 7 and Figure 8As shown, the device includes a feed pipe 41, a mixer 42, and a material distribution mechanism 43. The feed pipe 41 is shaped like an inverted L or a horizontal inverted T, meaning it includes a vertical main pipe and a horizontal discharge pipe. The lower end of the main pipe has a feed inlet 411 (for liquid sludge to be dewatered) and a dosing inlet (for flocculant). The feed inlet 411 is located at the bottom of the feed pipe 41, and the dosing inlet is located on the side wall of the feed pipe 41, with the two being approximately perpendicular. The feed inlet 411 can be connected to a feed pump (not shown), and the dosing inlet 412 can be connected to a dosing pump (not shown). It should be noted that the feed pump and / or dosing pump are not integral with the dewatering machine of this embodiment; they are preferably external components. An discharge port 413 is opened at the outer end of the discharge pipe. The mixer 42 is rotatably disposed inside the feed pipe 41. The feed pipe 41 and mixer 42 constitute a conventional non-powered mixer 42 or a tubular static mixer 42. The specific structure and working principle are not described in detail, but are easily understood and implemented by those skilled in the art. A material distribution mechanism 43 is provided below and on the outer side of the discharge port 413. In this embodiment, the material distribution mechanism 43 is the inventive point. In this embodiment, the material distribution mechanism 43 includes a material distribution hopper 431, an overflow weir wall 432, and a material distribution adjustment assembly 433. Wherein... Figure 8 As shown, the feed hopper 431 is a U-shaped structure, that is, it has a bottom surface (bottom wall) and two side surfaces (side walls). Along the discharge direction, the two side surfaces (side walls) expand outwards, meaning the feed hopper 431 is funnel-shaped, and the width of the bottom surface (bottom wall) of the feed hopper 431 gradually increases. Preferably, in this embodiment of the invention, in order to ensure uniform sludge distribution at the feed ends of the upper and lower filter cloths 30 of the feed hopper 431, which is beneficial for improving subsequent dewatering, the width of the outlet end of the feed hopper 431 is approximately 2 / 3 (including 2 / 3) of the width of the lower filter cloth 30. The number of overflow weir walls 432 is at least two, and at least two are spaced apart on the bottom surface along the discharge direction, such as... Figure 7 As shown, the cross-section of any overflow weir wall 432 (this cross-section is a cross-section perpendicular to the length direction of the overflow weir wall 432) is triangular, and the rear side in the discharge direction is preferably perpendicular to the bottom surface (bottom wall) of the material hopper 431, and the front side in the discharge direction is preferably at an acute angle to the bottom surface (bottom wall) of the material hopper 431 (the specific angle is not described or limited, but is 60° for example), and as... Figure 8 As shown, any overflow weir 432 gradually decreases in height from the middle to both sides along its length, that is, it is high in the middle and low on both sides. Figure 8The middle position of any overflow weir 432 (located on both sides) corresponds to the outlet 413 of the feed pipe 41. Because the sludge to be dewatered, mixed with flocculant, rushes towards the middle position of the overflow weir 432 after exiting the outlet 413, the flow rate is highest in the middle, and the material accumulation speed is fastest. To prevent excessively rapid overflow in the middle, the overflow weir 432 in this application is designed to slope downwards from the middle position to both sides, meaning the middle position is the highest, and the height gradually decreases on both sides. This causes the rapidly accumulating sludge in the middle to be diverted to both sides. Preferably, in this embodiment of the utility model, as... Figure 8 As shown, viewed along the discharge direction, any overflow weir 432 is triangular or isosceles trapezoidal in shape, with the height of the middle position being 1 / 3 to 1 / 2 higher than the height of the two sides (the lowest positions). This design allows for better sludge distribution on the bottom surface of the distribution hopper 431. The height of the overflow weir 432 also varies along the discharge direction, specifically decreasing gradually. That is, the overflow weir 432 at the rear end of the discharge direction, i.e., the discharge port 413 away from the inlet pipe 41, is lower than the overflow weir 432 near the discharge port 413, for example, by 1 / 3 to 1 / 2. This means that the difference between the middle position and the two lowest positions of the overflow weir 432 is 1 / 3 to 1 / 2, meaning the two sides are symmetrical. This design further enhances the sludge distribution on the bottom surface of the distribution hopper 431. In summary, the design ensures that the sludge flow rate and the sludge are evenly distributed across the entire width of the sludge hopper 431. Preferably, in this embodiment, to prevent uneven sludge distribution on the filter cloth, a sludge adjustment component 433 is provided at the discharge end of the sludge hopper 431. The sludge adjustment component 433 includes a sludge adjustment weir 4331, a counterweight adjustment rod 4332, and a first counterweight block 4333. The sludge adjustment weir 4331 adjusts the discharge using gravity, ensuring even distribution of sludge on the filter cloth. Specifically, the upper end of the sludge adjustment weir 4331 is connected by a horizontal rotating shaft (not indicated, e.g., ...). Figure 7 The feed regulating gate 4331 (shown in the front-to-back direction) is rotatably connected to the two sides (side walls) of the feed hopper. The bottom surface of the feed regulating gate 4331 is arc-shaped and slides in contact with the bottom surface (bottom wall) of the feed hopper 431. Furthermore, at each end of the axial direction of the rotating shaft, there is a horizontally outward-facing gate, i.e., as shown... Figure 7The leftward-extending counterweight adjustment rod 4332 shown has a movable first counterweight block 4333 on either of its components. For example, the first counterweight block 4333 passes through the counterweight adjustment rod 4332 and has a fastening screw (not shown). The position of the first counterweight block 4333 is fixed by rotating the fastening screw so that it abuts against the counterweight adjustment rod 4332, or the first counterweight block 4333 can move freely on the counterweight adjustment rod 4332 by rotating the fastening screw so that it no longer abuts against the counterweight adjustment rod 4332. When the sludge flow rate is low, the sludge's own weight pushes open the cloth regulating weir 4331 to a small degree. When the sludge flow rate is high, the sludge's own weight pushes open the cloth regulating weir 4331 to a large degree. Therefore, by moving the first counterweight block 4333 to the position of the counterweight regulating rod 4332, the opening of the cloth regulating weir 4331 can be automatically adjusted according to the sludge flow rate, so that the sludge falls onto the filter cloth of the gravity dewatering section 31 with a uniform thickness and a set width, providing favorable conditions for improving the sludge dewatering effect. It should be noted that in this embodiment of the present invention, a sludge distribution amount can be preset to adjust the predetermined position of the first counterweight 4333 on the counterweight adjustment rod 4332 (specifically, the first counterweight 4333 moves to the right, the greater the weight of the distribution adjustment weir 4333, the smaller the opening of the distribution adjustment weir 4333 for the same flow of sludge, and vice versa). The first counterweight 4333 is then fixed. At this time, regardless of the sludge flow rate at the outlet 413, the sludge distribution amount is fixed after passing through the overflow weir 432 of the distribution hopper 431 and the distribution adjustment weir 4331, that is, the opening of the distribution adjustment weir 4331 is almost unchanged, thereby ensuring that the sludge is evenly distributed to the feed end of the lower filter cloth 30.

[0058] In this embodiment of the utility model, the sludge unloading device 50 is set as follows: Figure 1 The left end of the frame 10 shown is opposite to the feeding and spreading device 40. Although the dewatered sludge cake mainly remains on the lower filter cloth 30 due to gravity, sludge cake still remains on the upper filter cloth 20 due to the large pressure applied during the pressing and dewatering section 33. Therefore, both the upper filter cloth 20 and the lower filter cloth 30 need to be equipped with sludge scrapers. The specific structure of the sludge unloading device 50 in this embodiment of the present invention is as follows: Figure 9 and Figure 10As shown, the assembly includes a support 51, an upper discharge roller 52, a lower discharge roller 53, an upper scraper 56, a lower scraper 57, and a force-applying device. The support 51 is a roughly square plate structure fixed to the left end of the frame 10. In this embodiment, two supports 51 are spaced apart at the front and rear of the left end of the frame 10. The upper discharge roller 52 and the lower discharge roller 53 are arranged vertically and horizontally, rotating at intervals between the two supports 51. The upper filter cloth 20 extends to the upper right after passing over the upper discharge roller 52 following the exit of the pressing rear end guide roller 64. The lower filter cloth 30 extends to the lower right after passing over the lower discharge roller 53 following the exit of the pressing rear end guide roller 64. The upper scraper 56 is mounted on the upper side of the upper discharge roller 52 and faces the upper filter cloth 20 on the upper discharge roller 52. More specifically, an upper blade holder 54 is provided on the upper left side above the support 51. The upper scraper 56 is detachably mounted on the lower end of the upper blade holder 54 facing the upper filter cloth 20. One end of the upper blade holder 54 is rotatably connected to the support 51, and the other end extends downward and inclined to the left side of the support 51. Similarly, a lower blade holder 55 is provided on the lower left side below the support 51. The lower scraper 57 is detachably mounted on the upper end of the lower blade holder 55 facing the lower filter cloth 30. One end of the lower blade holder 55 is rotatably connected to the support 51, and the other end extends upward and inclined to the left side of the support 51. The force-applying device is mounted on the support 51 and applies force to the upper scraper 56 and the lower scraper 57, causing the upper scraper 56 to tend to approach the upper filter cloth 20 on the upper discharge roller 52 and the lower scraper 57 to tend to approach the lower filter cloth 30 on the lower discharge roller 53, thereby increasing the contact between the upper and lower scrapers and the upper and lower filter cloths and thus improving the sludge scraping effect. In one embodiment of the force-applying device, such as... Figure 9 As shown, it includes a lever 581a horizontally arranged between the upper discharge roller 52 and the lower discharge roller 53, an upper pull rod 582a, a lower pull rod 583a, and a second counterweight 584a. One end of the lever 581a is specifically as shown... Figure 9 The left end is rotatably connected to the outer end of the support 51, as shown. Figure 9 On the horizontally arranged support plate 59 at the left end shown, the lever 581a is rotated with the connection point as the fulcrum. The two sides of the fulcrum of lever 581a have different lengths, with one end being longer ( Figure 9 The middle is the right end), and the other end is short ( Figure 9 The middle is the left end). The upper pull rod 582a is rotatably connected to the lever 581a on one side of the fulcrum ( Figure 9 (The middle is on the right), the pull rod 583a is rotatably connected to the lever 581a on the other side of the fulcrum ( Figure 9 (The middle is on the left). The second counterweight 584a is movably positioned on the lever 581a and located at the end farther from the fulcrum, i.e., as shown. Figure 9The right end is shown. For example, the second counterweight 584a is movably mounted on the right end of the lever 581a, and is locked to the lever 581a by a fastening screw when the lever 581a is in a horizontal equilibrium state. For instance, the position of the second counterweight 584a can be fixed by rotating the fastening screw so that it abuts against the lever 581a, or by rotating the fastening screw so that it no longer abuts against the lever 581a, allowing the second counterweight 584a to move freely on the lever 581a to adjust the force applied by the force-applying device 58a. The second counterweight 584a adjusts the applied force while maintaining the horizontal equilibrium of the lever 581a. In this embodiment of the invention, both the upper pull rod 582a and the lower pull rod 583a are telescopically adjustable rods, for example, both are telescopically adjustable rods consisting of two sleeved sections. The other end of the upper pull rod 582a is rotatably connected to the upper tool holder 54, and the other end of the lower pull rod 583a is rotatably connected to the lower tool holder 55. In this embodiment of the invention, the force-applying device 58a utilizes the lever principle 581a. Adjustable length pull rods of the upper and lower blade holders 55 are connected to the levers 581a on both sides of the fulcrum. A movable second counterweight 584a acts as the force of the lever 581a, simultaneously applying force to the upper and lower scrapers 57. By moving the distance between the second counterweight 584a and the fulcrum, the upper and lower scrapers 57 achieve optimal shoveling and cutting force, resulting in the best shoveling effect. In use, the contact degree between the upper and lower scrapers and the upper and lower filter cloths can be adjusted according to the thickness and hardness of the mud cake on the upper and lower filter cloths. The position of the second counterweight 584a on the lever 581a is adjusted accordingly, and then locked. As an alternative embodiment of the force-applying device, such as… Figure 10As shown, the force-applying device 58b includes an upper force-applying spring 581b, a lower force-applying spring 582b, an upper connecting rod 583b, and a lower connecting rod 584b. The upper force-applying spring 581b and the lower force-applying spring 582b are arranged vertically opposite each other. A horizontally arranged support plate 59 is also provided on the support 51, located between the upper unloading roller 52 and the lower unloading roller 53 (in the previous embodiment of the force-applying device, this support plate 59 is also present, and the support plate 59 is rotatably connected to the lever 581a of the force-applying device 58a; in this embodiment, the support plate 59 is connected to the upper force-applying spring 581b and the lower force-applying spring 582b). The upper end of the upper connecting rod 583b is rotatably connected to the upper knife holder 54. The lower end of rod 583b is connected to the upper end of upper force spring 581b, and the lower end of upper force spring 581b is connected to support plate 59. Similarly, the lower end of lower connecting rod 584b is rotatably connected to one end of lower blade holder 55, and the upper end of lower connecting rod 584b is connected to the lower end of lower force spring 582b. The upper end of lower force spring 582b is connected to support plate 59. Upper force spring 581b applies a biasing force to upper blade holder 54, causing upper scraper 56 on upper blade holder 54 to approach upper filter cloth 20 on upper discharge roller 52. Lower force spring 582b applies a biasing force to lower blade holder 55, causing lower scraper 57 on lower blade holder 55 to approach lower filter cloth 30 on lower discharge roller 53. In this embodiment, the upper force spring 581b and the lower force spring 582b apply bias pressure to the upper blade holder 54 and the lower blade holder 55 respectively, thereby elastically adjusting the contact degree between the upper scraper 56 and the lower scraper 57 and the upper filter cloth 20 and the lower filter cloth 30 respectively, and improving the sludge scraping effect.

[0059] In summary, in the array roller back pressure belt dewatering machine of this utility model embodiment, the settled sludge, after being processed by the previous processes, is temporarily stored in the sludge thickening tank and then pumped to the dewatering machine in the dewatering workshop. The feeding and spreading device 40 on the dewatering machine mixes the sludge with the flocculant and then evenly distributes it onto the lower filter cloth 30 of the gravity dewatering section 31. At this stage, due to the action of the flocculant, a large amount of free water in the sludge is discharged from the mesh of the lower filter cloth 30 into the receiving hopper and then falls into the receiving trough due to gravity. The remaining sludge, which has been agglomerated into flocs by the flocculant, moves with the lower filter cloth 30 to the upper... The pre-compression dewatering section 32, formed by the filter cloth 20 and the lower filter cloth 30, gradually compresses the sludge into a solid sludge cake as the first included angle α gradually decreases. The sludge then enters the pressing dewatering section 33. The pressing dewatering section 33 mainly consists of a large-diameter dewatering roller 61, a pressing front guide roller 63 that guides the upper filter cloth 20 and the lower filter cloth 30 to form an absolute large wrap angle with the dewatering roller 61, and a pressing rear guide roller 64. At the same time, several rollers are arranged in a ring around the outer side of the lower filter cloth 30 that wraps around the dewatering roller 61, and are connected to the tensioning member 623 in series through the chain plates 6211 on both sides. Under the action of the tensioning member 623, the sludge is pressed onto the lower filter cloth 30, forming a series of roller-like secondary crushing of the sludge layer sandwiched between the upper filter cloth 20 and the lower filter cloth 30. In addition, a 50Hz high-frequency vibrator 622 is also provided on the tensioning member 623. The high-frequency vibration wave is transmitted to each roller 621 through the tensioning member 623, so that the roller 621 causes the sludge layer to vibrate at high frequency while crushing the sludge layer. This causes a certain degree of cell wall breaking effect in the bacterial cells in the sludge. Combined with the cell wall breaking effect of the flocculant, the water in the sludge is further separated. Under the combined pressure of the upper filter cloth 20, the lower filter cloth 30 and the main dewatering roller 61, the sludge is immediately discharged from the mesh of the upper filter cloth 20 and the lower filter cloth 30 and falls into the water receiving tank 11 to flow away. The sludge cake in the interlayer is scooped off by the sludge unloading device 50 at the sludge outlet of the sludge outlet section 34 as the upper filter cloth 20 and the lower filter cloth 30 move. The upper filter cloth 20 and lower filter cloth 30 continue to operate, and after being regenerated by the filter cloth cleaning device 90, they enter the next process of sludge removal, dewatering, pressing, sludge unloading, and washing, thus operating continuously without interruption. The upper filter cloth 20 and lower filter cloth 30 are also equipped with tensioning devices 80, which, on the one hand, provide a certain pre-tension force to the filter cloths, creating friction between the upper and lower filter cloths 20 and lower filter cloth 30 and the surface of the dewatering roller 61 (which is also the main drive roller), ensuring continuous cyclic operation of the upper and lower filter cloths 20 and lower filter cloth 30. On the other hand, they also provide a compressive force to the sludge clamped between the upper and lower filter cloths 20 and lower filter cloth 30, independently pressing out some water from the sludge while providing a suitable background environment for other intermittent dewatering processes. The upper filter cloth 20 and lower filter cloth 30 are also equipped with a deviation correction device 70 and an over-deviation alarm and shutdown function (this is prior art and not an innovation of this utility model, therefore it is not described here; those skilled in the art can easily understand and implement it), to ensure the continuous operation of the dewatering machine.

[0060] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An array roller back-pressure belt dewatering machine, comprising a frame, an upper filter cloth and a lower filter cloth respectively wound around a plurality of guide rollers above and below the frame, characterized in that, Along the sludge conveying direction, the portions of the lower filter cloth facing the upper filter cloth are sequentially provided with a gravity dewatering section, a pre-compression dewatering section, a pressing dewatering section, and a sludge discharge section. The belt dewatering machine further includes a deep dewatering component disposed in the pressing dewatering section, the deep dewatering component comprising: The dewatering roller is rotatably disposed within the frame; The tensioning vibration assembly includes a high-frequency vibrator and several rollers. The rollers are arranged in a ring array around the outer periphery of the dewatering roller and form a pressing passage between the rollers and the outer periphery of the dewatering roller. The high-frequency vibrator transmits the high-frequency vibration waves generated during its operation to the rollers. The pressing and dewatering section encloses the sludge to be dewatered, which has been pre-pressed into a solid state after being agglomerated into flocs by flocculant and is driven through the pressing passage. Several rollers are pressed against the outer surface of the pressing and dewatering section corresponding to the lower filter cloth, and the pressing and dewatering section corresponding to the upper filter cloth is wrapped around the outer circumference of the dewatering roller.

2. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, Along the sludge conveying direction, the first included angle between the upper filter cloth and the lower filter cloth at the pre-compression dewatering section gradually decreases, the second included angle between the upper filter cloth and the lower filter cloth at the gravity dewatering section also gradually decreases, and the third included angle between the upper filter cloth and the lower filter cloth at the sludge discharge section gradually increases, and the maximum value of the first included angle is less than the minimum value of the second included angle.

3. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, The axial ends of the plurality of rollers are connected in series by chain plates, and the tensioning vibration assembly further includes a tensioning component, which includes: Two tensioning screws are provided. The two outermost rollers of the plurality of rollers are each connected to one of the tensioning screws. Any one of the tensioning screws is movably inserted into a tensioning guide tube inside a first crossbeam fixed above the plurality of rollers. The load-bearing crossbeam has its bottom end elastically supported on the first crossbeam by at least two inflatable and deflated vibration-damping airbags, and the high-frequency vibrator is fixed on the upper surface of the load-bearing crossbeam. The ends of the two tensioning screws that are furthest from the rollers to which they are connected pass through the load-bearing beam and are each fixed by a tensioning nut.

4. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, The dewatering roller includes a hollow roller body with an inner cavity and a spindle mounted on the roller body along the axis of the roller body. The two ends of the spindle extend outward from the roller body, and the outer circumferential surface of the roller body is provided with a plurality of pressing bars that extend radially outward at intervals along its circumference. A guide groove is formed between any two adjacent pressing bars, and a drainage hole is opened on the bottom surface of the guide groove that penetrates and communicates with the inner cavity of the roller body. The guide groove extends along the axial direction of the roller body, and a plurality of drainage ports communicating with the inner cavity are respectively opened on the end plates at both ends of the roller body. The roller body is connected to the drive motor via the mandrel and is driven by the drive motor to rotate around the axis of the mandrel. The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the mandrel.

5. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, Both the upper and lower filter cloths are equipped with tensioning devices. The tensioning device corresponding to the upper filter cloth is fixed on the second crossbeam at the upper end of the frame, and the tensioning device corresponding to the lower filter cloth is fixed on the third crossbeam at the lower end of the frame. Each tensioning device includes a tensioning roller and a tensioning cylinder connected to the tensioning roller. The axial ends of each tensioning roller are respectively slidably mounted in the first guide frame fixed on their respective crossbeams.

6. The array roller back-pressure belt dewatering machine according to claim 1 or 5, characterized in that, Both the upper and lower filter cloths are equipped with a correction device. Each correction device includes a correction roller, a correction cylinder connected to the correction roller, and a detection device for detecting deviation of the upper or lower filter cloth. Each correction roller has a first pin hole that penetrates radially at one axial end and a second pin hole that penetrates radially and extends axially at the other axial end. The end of the correction roller with the first pin hole is connected to a sliding bearing seat by a positioning pin, and the end of the correction roller with the second pin hole is connected to another sliding bearing seat by a sliding pin. The two sliding bearing seats are respectively connected to a correction cylinder and are each slidably mounted in a second guide frame fixed on the machine frame. The positioning pin is rotatably connected to the first pin hole relative to the correction roller, and the sliding pin is rotatably mounted in the second pin hole relative to the correction roller and slidably mounted in the second pin hole along the extension direction of the second pin hole. Each of the upper and lower filter cloths is provided with a detection device on both sides corresponding to the position of their respective correction rollers, and each detection device is electrically connected to the correction cylinder on its corresponding side.

7. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, It also includes a feeding and spreading device disposed at one end of the frame, the feeding and spreading device comprising: The feed pipe is in the shape of an inverted L or a horizontal inverted T, with a feed inlet and a dosing inlet at the lower end and a discharge outlet at the upper end. A mixer, which is rotatably disposed within the feed pipe; A fabric feeding mechanism, located at the outlet of the feed pipe, includes a fabric feeding hopper extending downward at an incline from the outlet, at least two overflow weirs spaced apart on the bottom surface of the fabric feeding hopper along the discharge direction, and a fabric feeding adjustment assembly located at the outlet of the fabric feeding hopper. The fabric feeding hopper gradually increases in width along the discharge direction. The middle position of any overflow weir is opposite the outlet, and the height of any overflow weir gradually decreases from the middle to both sides along its length. The height of the overflow weir gradually decreases along the discharge direction. The fabric feeding adjustment assembly includes a fabric feeding adjustment weir gate, a counterweight adjustment rod, and a first counterweight block. The upper two ends of the fabric feeding adjustment weir gate are rotatably connected to the two side walls of the fabric feeding hopper via a pivot, and the bottom edge contacts the bottom surface of the fabric feeding hopper. A counterweight adjustment rod is connected to each end of the pivot, and each counterweight adjustment rod has a first counterweight block that is movable and locked after reaching a predetermined position.

8. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, It also includes a sludge unloading device disposed at the other end of the frame, the sludge unloading device comprising: Supports, which are fixed to the frame; An upper discharge roller is rotatably disposed at the upper end of the support, and the upper filter cloth passes around the upper discharge roller and extends upward; The lower discharge roller is rotatably disposed at the lower end of the support and opposite to the upper discharge roller, and the lower filter cloth passes around the lower discharge roller and extends downward; The upper scraper is mounted on an upper blade holder rotatably connected at one end to the support and facing the upper filter cloth on the upper discharge roller; The lower scraper is mounted on a lower blade holder rotatably connected at one end to the support and faces the lower filter cloth on the lower discharge roller; A force-applying device, which is mounted on the support and is used to apply a force to the upper and lower blade holders, causing the upper and lower scrapers on them to move closer to the upper and lower filter cloths, respectively.

9. The array roller back-pressure belt dewatering machine according to claim 8, characterized in that, The force-applying device includes a lever horizontally arranged between the upper and lower unloading rollers and rotatably connected to an outwardly protruding support plate at the end of the support away from the frame; a telescopic upper pull rod with one end rotatably connected to the upper tool holder and the other end rotatably connected to the lever on one side of the rotation fulcrum; a telescopic lower pull rod with one end rotatably connected to the lower tool holder and the other end rotatably connected to the lever on the other side of the rotation fulcrum; and a second counterweight adjustablely mounted on the lever and locked when the lever is in a horizontally balanced state. The distance from one end of the lever to its rotation fulcrum is different from the distance from the other end to its rotation fulcrum, and the second counterweight is located at the end of the lever farther from its rotation fulcrum. The force-applying device includes a support plate horizontally arranged between the upper discharge roller and the lower discharge roller and fixedly connected to the support, an upper force-applying spring with one end connected to the support plate and the other end connected to the other end of the upper knife holder via an upper connecting rod, and a lower force-applying spring with one end connected to the support plate and the other end connected to the other end of the lower knife holder via a lower connecting rod. The upper force-applying spring and the lower force-applying spring respectively apply biasing forces toward the upper filter cloth and the lower filter cloth to the upper knife holder and the lower knife holder, respectively.

10. The array roller back-pressure belt dewatering machine according to claim 1, characterized in that, The upper filter cloth and the lower filter cloth are each provided with a filter cloth cleaning device. The upper filter cloth and the lower filter cloth pass through their respective filter cloth cleaning devices in a driving manner. Each filter cloth cleaning device is provided with a plurality of nozzles arranged along the width direction of its respective filter cloth for spraying cleaning water; and / or The frame is provided with a downwardly extending water receiving hopper below the gravity dewatering section and the pre-compression dewatering section corresponding to the lower filter cloth. The bottom of the frame is also provided with a water receiving trough below the dewatering roller. The lower end of the water receiving hopper extends to the top of the water receiving trough.

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