Array roller back pressure belt type dehydrator

Abstract

The invention 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 sludge conveying direction, the array roller back pressure belt type dehydrator further comprises a deep dehydration assembly, and according to the deep dehydration assembly, dehydration rollers are driven to be rotatably arranged in the rack; 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] The present invention relates to the technical field of sludge dewatering equipment, and particularly relates to an array roll backpressure belt type dewatering machine. Background Art

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

[0003] Deep dewatering of sludge is a currently popular sludge dewatering process, which has extremely high social and economic benefits. The methods adopted for deep dewatering of sludge currently include squeezing out water from the sludge by applying absolute high pressure to the dewatering equipment, and another method is to add chemicals to the sludge in advance, so that the water in the sludge is fully freed and then squeezed out through the equipment to filter and squeeze out the water. Some also add a drying process to further dry the sludge cake. Commonly used types of sludge dewatering equipment include horizontal plate and frame filter presses, spiral screw dewatering machines, belt dewatering machines, centrifugal dewatering machines, etc. These equipment are undoubtedly all mature dewatering equipment with their respective advantages, but there are still some defects, such as high energy consumption, high cost, large floor area, high operation and maintenance costs, etc.

[0004] A belt type sludge dewatering machine is a device for treating sludge, usually used in places such as sewage treatment plants, chemical plants, paper mills, etc. After the traditional belt type sludge dewatering machine treats the sludge, the moisture content of the sludge cake is still relatively high. In order to solve the problem of high moisture content of the sludge cake, Chinese Patent Publication No. CN116022989B discloses a high-dry high-pressure type belt type sludge dewatering machine. By adding a sludge preliminary pressing filter belt assembly to the traditional belt type dewatering machine to remove free water and interstitial water, and then spraying a modifier and a skeleton agent on the sludge in the mixing system, the modifier destroys the cell wall based on protein to release the bound water and adsorbed water of the sludge, reduce the sludge viscosity, and improve the sludge dewatering effect. The skeleton agent changes the characteristics of the sludge, enhances the sludge dewaterability, promotes the hydrolysis of organic matter, and reduces the difficulty of water treatment. Finally, the sludge is evenly distributed on the high-pressure pressing filter belt device, and by having more pressing rollers, the pressing rollers are arranged more closely, and the wrap angle is larger, the moisture content of the sludge is lower. Although the belt type sludge dewatering machine of the above technical solution has a better dewatering effect and the moisture content of the discharged sludge can reach 60%, its process is relatively complex and the cost is high. It is necessary to add a modifier and a skeleton agent for mixing, and at the same time, a skeleton agent automatic feeding device, a skeleton agent conveying device (conveying pipe and conveying pump), a modifier feeding device, a modifier conveying device (conveying pipe and conveying pump), etc. need to be added accordingly, resulting in a complex structure of the entire equipment, a large floor area, high maintenance costs, etc. Summary of the Invention

[0005] In view of at least one of the above-mentioned existing technical problems, the object of the present invention is to provide an array roll backpressure belt filter press, which solves the problems of complex structure, large floor area and high cost of the belt filter press in the prior art.

[0006] The technical solution of the present invention is as follows: The object of the present invention is to provide an array roll backpressure belt filter press, which includes a frame, an upper filter cloth and a lower filter cloth respectively wound around a plurality of guide rollers above and below the frame. Along the conveying direction of the sludge, the part of the lower filter cloth facing the upper filter cloth is successively provided with a gravity dewatering section, a pre-pressing dewatering section, a squeezing dewatering section and a sludge discharging section. The belt filter press further includes a deep dewatering assembly arranged in the squeezing dewatering section. The deep dewatering assembly includes: A dewatering roll, which is rotatably arranged in the frame under drive; A tensioning vibration assembly, which includes a high-frequency vibrator and a plurality of grinding rollers. The plurality of grinding rollers are annularly arrayed along the outer circumference of the dewatering roll and a squeezing passage is formed between the outer circumferential wall surfaces of the dewatering roll. The high-frequency vibrator transmits the high-frequency vibration waves generated by its work to the plurality of grinding rollers; The squeezing dewatering section clamps the sludge to be dewatered that has been flocculated into flocs and pre-pressed into a solid state and is driven to pass through the squeezing passage. A plurality of the grinding rollers are pressed against the outer side surface of the corresponding squeezing dewatering section of the lower filter cloth, and the corresponding squeezing dewatering section of the upper filter cloth is wound around the outer circumference of the dewatering roll. The plurality of grinding rollers apply high-frequency vibration to the sludge to be dewatered clamped by the lower filter cloth and the upper filter cloth, and the sludge generates high-frequency vibration, so that the bacterial clusters in the sludge have a cell wall breaking effect.

[0007] Preferably, along the sludge conveying direction, the first included angle between the upper filter cloth and the lower filter cloth at the position of the pre-pressing dewatering section gradually becomes smaller, the second included angle between the upper filter cloth and the lower filter cloth at the position of the gravity dewatering section also gradually becomes smaller, the third included angle between the upper filter cloth and the lower filter cloth at the position of the sludge discharging section gradually becomes larger, and the maximum value of the first included angle is less than the minimum value of the second included angle.

[0008] Preferably, the axial ends of the plurality of grinding rollers are respectively connected in series by chain plates. The tensioning vibration assembly further includes a tensioning member. The high-frequency vibrator transmits high-frequency vibration waves to the plurality of grinding rollers through the tensioning member. The tensioning member includes: Two tensioning screw rods. One of the two outermost grinding rollers among the plurality of grinding rollers is respectively connected with one of the tensioning screw rods. Any one of the tensioning screw rods is movably inserted into a tensioning conduit in a first cross beam fixed above the plurality of grinding rollers; The stress-bearing crossbeam is elastically supported on the first crossbeam by at least two vibration isolation and tensioning airbags that can be inflated and deflated, and the high-frequency vibrator is fixed on the upper surface of the stress-bearing crossbeam; One ends of the two tensioning lead screws, which are away from the respective roller mills they are connected to, respectively pass through the stress-bearing crossbeam and are each fixed by a tensioning nut.

[0009] Preferably, the dehydration roller includes a roller body with a hollow interior to form an inner cavity and a core shaft disposed along the axis of the roller body on the roller body. Axial ends of the core shaft extend outside the roller body, and a plurality of pressing grid bars protruding radially outward are arranged at intervals along the circumferential direction of the outer peripheral surface of the roller body. A flow guiding groove is formed between any two adjacent pressing grid bars, and a drainage hole penetrating through and communicating with the inner cavity of the roller body is opened on the bottom surface of the flow guiding groove. The flow guiding 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 end plates at both axial ends of the roller body; The roller body is connected to a driving motor through the core shaft and is driven by the driving motor to rotate around the axis of the core shaft. The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the core shaft.

[0010] Preferably, tensioning devices are provided on both the upper filter cloth and the lower filter cloth. 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. Any one of the tensioning devices includes a tensioning roller and a tensioning cylinder connected to the tensioning roller. Axial ends of any one of the tensioning rollers are respectively slidably arranged within first guide frame frames fixed on their respective crossbeams.

[0011] Preferably, deviation rectifying devices are provided on both the upper filter cloth and the lower filter cloth. Any one of the deviation rectifying devices includes a deviation rectifying roller, a deviation rectifying cylinder connected to the deviation rectifying roller, and a detection device for detecting deviation of the upper filter cloth or the lower filter cloth. A radially penetrating first pin hole is opened at one axial end of any one of the deviation rectifying rollers, and a radially penetrating and axially extending second pin hole is opened at the other axial end. One end of the deviation rectifying roller with the first pin hole is connected within a sliding bearing seat through a positioning pin, and one end of the deviation rectifying roller with the second pin hole is connected within another sliding bearing seat through a sliding pin. The two sliding bearing seats are respectively connected to a deviation rectifying cylinder and are each slidably arranged within a second guide frame frame fixed on the frame. The positioning pin is rotatably connected within the first pin hole relative to the deviation rectifying roller, and the sliding pin is rotatably arranged within the second pin hole relative to the deviation rectifying roller and slidable along the extending direction of the second pin hole; Detection devices are respectively provided on both sides of the positions of the upper filter cloth and the lower filter cloth corresponding to their respective deviation rectifying rollers. Any one of the detection devices is electrically connected to the deviation rectifying cylinder on its corresponding side.

[0012] Preferably, it further includes a feeding and distributing device arranged at one end of the rack for mixing the sludge to be dewatered and the flocculant and conveying them to the feeding end of the lower filter cloth. The feeding and distributing device includes: A feeding pipe, which is in an inverted L shape or a horizontal T shape, and has a feeding port and a chemical adding port at its lower end and a discharging port at its upper end; A mixer, which is rotatably arranged in the feeding pipe; A distributing mechanism, which is arranged at the discharging port of the feeding pipe. It includes a distributing hopper extending obliquely downward from the discharging port, at least two overflow weir walls arranged at intervals on the bottom surface of the distributing hopper along the discharging direction, and a distributing adjusting assembly arranged at the discharging port of the distributing hopper. Wherein, the width of the distributing hopper gradually increases along the discharging direction, the middle position of any one of the overflow weir walls is opposite to the discharging port, and the height of any one of the overflow weir walls gradually decreases from the middle to both sides along its length direction. Along the discharging direction, the height of the overflow weir walls gradually decreases. The distributing adjusting assembly includes a distributing adjusting weir gate, a counterweight adjusting rod and a first counterweight block. The two ends of the upper edge of the distributing adjusting weir gate are rotatably connected to the two side walls of the distributing hopper through rotating shafts, and the bottom edge is in contact with the bottom surface of the distributing hopper. A counterweight adjusting rod is respectively connected to both ends of the rotating shaft, and a first counterweight block which can move in position and be locked after reaching a predetermined position is arranged on any one of the counterweight adjusting rods.

[0013] Preferably, it further includes a sludge discharging device arranged at the other end of the rack. The sludge discharging device includes: A support, which is fixed on the rack; An upper discharging roller, which is rotatably arranged at the upper end of the support, and the upper filter cloth bypasses the upper discharging roller and extends upward; A lower discharging roller, which is rotatably arranged at the lower end of the support and opposite to the upper discharging roller, and the lower filter cloth bypasses the lower discharging roller and extends downward; An upper scraper, which is installed on an upper tool rest rotatably connected at one end above the support and faces the upper filter cloth on the upper discharging roller; A lower scraper, which is installed on a lower tool rest rotatably connected at one end below the support and faces the lower filter cloth on the lower discharging roller; A force applying device, which is installed on the support and used to apply a force to the upper tool rest and the lower tool rest to make the upper scraper and the lower scraper on each of them approach the upper filter cloth and the lower filter cloth respectively.

[0014] Preferably, the boosting device includes a lever horizontally arranged between the upper discharging roller and the lower discharging roller and rotatably connected to a support plate protruding outwardly at one end of the support away from the frame, an upper pull rod with a telescopic length, one end of which is rotatably connected to the upper tool rest and the other end is rotatably connected to the lever on one side of the rotation fulcrum, a lower pull rod with a telescopic length, one end of which is rotatably connected to the lower tool rest and the other end is rotatably connected to the lever on the other side of the rotation fulcrum, and a second counterweight block which is movably adjustable in position and locked when the lever is in a horizontal balance state. The lengths of one end of the lever from its rotation fulcrum and the other end from its rotation fulcrum are different, and the second counterweight block is arranged on the end of the lever farther from its rotation fulcrum; or The boosting device includes a support plate horizontally arranged between the upper discharging roller and the lower discharging roller and fixedly connected to the support, an upper boosting spring with one end connected to the support plate and the other end connected to the other end of the upper tool rest through an upper connecting rod, and a lower boosting spring with one end connected to the support plate and the other end connected to the other end of the lower tool rest through a lower connecting rod. The upper boosting spring and the lower boosting spring respectively apply biasing forces towards the upper filter cloth and the lower filter cloth to the upper tool rest and the lower tool rest.

[0015] Preferably, filter cloth cleaning devices are further respectively arranged on the upper filter cloth and the lower filter cloth. The upper filter cloth and the lower filter cloth respectively pass through their corresponding filter cloth cleaning devices in a driving manner. A plurality of nozzles for spraying cleaning water are arranged on any one of the filter cloth cleaning devices along the width direction of the corresponding filter cloth; and / or A water receiving hopper extending obliquely downward is further arranged below the gravity dewatering section and the pre-press dewatering section of the frame corresponding to the lower filter cloth. A water receiving tank is arranged at the bottom of the frame corresponding to the lower part of the dewatering roller. The lower end of the water receiving hopper extends above the water receiving tank.

[0016] Compared with the prior art, the advantages of the present invention are: An array roller backpressure belt type dewatering machine of the present invention uses high-frequency vibration combined with a flocculant to cause a wall-breaking effect on sludge, separate the water contained therein, and then squeeze and filter it out through a roller. The moisture content of the mud cake is reduced to below 65%. It has the characteristics of high dewatering efficiency, simple structure, small size, economy, and low operation and maintenance costs, and can become a preferred dewatering device for sewage treatment plants. Description of the Drawings

[0017] The present invention will be further described below in conjunction with the drawings and embodiments: Figure 1 It is a schematic side structure diagram of the array roller backpressure belt type dewatering machine according to the embodiment of the present invention; Figure 2Schematic structural diagram of the deep dehydration component of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 3 Schematic side view structural diagram of the dehydration roll of the deep dehydration component of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 4 Schematic structural diagram of the tensioning vibration component of the deep dehydration component of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 5 Schematic side view structural diagram of the deviation rectifying device of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 6 is Figure 5 Schematic cross-sectional structure diagram taken along the A-A direction in Figure 7 Schematic side view structural diagram of the feeding and distributing device of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 8 Schematic front view structural diagram of the feeding and distributing device of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 9 Schematic structural diagram of one structure of the mud discharging device of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention; Figure 10 Schematic structural diagram of another structure of the mud discharging device of the array roll backpressure belt type dewatering machine according to an embodiment of the present invention.

[0018] Wherein: 10, frame; 11, water receiving tank; 12, first cross beam; 121, tensioning conduit; 13, second cross beam; 14, third cross beam; 15, second guide frame; 151, chute; 20, upper filter cloth; 30, lower filter cloth; 31, gravity dewatering section; 32, pre-press dewatering section; 33, pressing dewatering section; 34, sludge discharging section; 40, feeding and distributing device; 41, feeding pipe; 411, feeding port; 412, chemical adding port; 413, discharging port; 42, mixer; 43, distributing mechanism; 431, distributing hopper; 432, overflow weir wall; 433, distributing adjusting assembly; 4331, distributing adjusting weir gate; 4332, counterweight adjusting rod; 4333, first counterweight; 50, sludge discharging device; 51, support; 52, upper discharging roller; 53, lower discharging roller; 54, upper tool rest; 55, lower tool rest; 56, upper scraper; 57, lower scraper; 58a, force adding device; 581a, lever; 582a, upper pull rod; 583a, lower pull rod; 584a, second counterweight; 58b, force adding device; 581b, upper force adding spring; 582b, lower force adding 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 bars; 612, core shaft; 613, diversion groove; 614, drainage hole; 615, drainage port; 62, tensioning and vibrating assembly; 621, grinding roller; 6211, chain plate; 622, high-frequency vibrator; 623, tensioning member; 6231, tensioning screw rod; 6232, tensioning nut; 6233, force receiving cross beam; 6234, vibration isolation and tensioning air bag; 63, pressing front guide roller; 64, pressing rear guide roller; 70, deviation rectifying device; 71, deviation rectifying roller; 710, sliding bearing seat; 711, first pin hole; 712, second pin hole; 713, positioning pin; 714, sliding pin; 72, deviation rectifying cylinder; 80, tensioning device; 90, filter cloth cleaning device; 100, guide roller; 110, water receiving hopper. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the specific implementation manners and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and are not intended to limit the scope of the present invention. In addition, in the following descriptions, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0020] See Figures 1 to 10, An array roll backpressure belt type dewatering machine according to an embodiment of the present invention includes a frame 10, an upper filter cloth 20, a lower filter cloth 30, a plurality of guide rollers 100, a feeding and cloth distributing device 40, a deviation rectifying device 70, a tensioning device 80, a deep dewatering assembly 60, a water receiving hopper 110, a water receiving tank 11, a filter cloth cleaning device 90, and a sludge discharging device 50. Among them, the frame 10 is a cuboid frame structure surrounded by a plurality of cross beams and longitudinal beams, which is composed of an upper part and a lower part, and the length of the upper part is greater than that of the lower part. The feeding and cloth distributing device 40 and the sludge discharging device 50 are respectively arranged at both ends of the upper part of the frame 10, that is, the left and right ends as shown in Figure 1 . The feeding and cloth distributing device 40 is used to mix the sludge to be dewatered and the flocculant and then transport them to the feeding end of the lower filter cloth 30, and the sludge discharging device 50 is used to scrape off the mud cake adhered to the upper filter cloth 20 and the lower filter cloth 30 after dehydration is completed. It should be noted that in this embodiment, the extension length of the lower filter cloth 30 in the length direction of the frame 10 is longer than the extension length of the upper filter cloth 20 in the length direction of the frame 10. More specifically, the left ends of the upper filter cloth 20 and the lower filter cloth 30 are flush, 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 discharging end of the feeding and cloth distributing device 40, that is, the right end of the lower filter cloth 30 protrudes outwards to form a feeding end. A plurality of guide rollers 100 are respectively distributed in the upper part and the lower part of the frame 10, and the specific arrangement is not described and limited. The guide rollers 100 are provided to enable the upper filter cloth 20 and the lower filter cloth 30 to respectively form a closed-loop transmission structure and change the running directions of the upper and lower filter cloths, so that the structure of the dewatering machine is reasonable and the operation is reliable. The upper filter cloth 20 is wound around a plurality of guide rollers 100 on the upper part of the frame 10, and the lower filter cloth 30 is wound around a plurality of guide rollers 100 on the lower part of the frame 10. When the upper filter cloth 20 and the lower filter cloth 30 are working, one side of one of them is always facing and approaching the opposite side of the other. 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 are always facing and approaching each other, so as to squeeze and dehydrate the sludge to be dewatered between the two. In order to achieve effective dehydration, in this embodiment, in the sludge conveying direction ( Figure 1(from right to left), the facing parts of the upper filter cloth 20 and the lower filter cloth 30, namely the working surfaces, are successively set as a gravity dewatering section 31, a pre-press dewatering section 32, a pressing dewatering section 33, and a sludge discharging section 34. Among them, only the lower filter cloth 30 participates in the gravity dewatering section 31, and the upper filter cloth 20 does not participate. However, when the upper filter cloth 20 approaches the pre-press dewatering section 32, it will gradually approach the lower filter cloth 30. For the convenience of description, this section of the upper filter cloth 20 is also referred to as the gravity dewatering section 31. The sludge discharging section 34 is mainly based on the lower filter cloth 30, with the upper filter cloth 20 as an auxiliary. Most of the mud cakes in the sludge discharging section 34 are on the lower filter cloth 30 due to gravity. However, due to the squeezing action of the previous pressing dewatering section 33, some of the mud cakes still remain on the upper filter cloth 20. Tensioning devices 80 and deviation rectifying devices 70 are provided on both the upper filter cloth 20 and the lower filter cloth 30, and the tensioning devices 80 on the upper filter cloth 20 and the tensioning devices 80 on the lower filter cloth 30 have the same structure. The deviation rectifying devices 70 on the upper filter cloth 20 and the deviation rectifying devices 70 on the lower filter cloth 30 have the same structure, but only the positions are different. 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 cloth can be tensioned, thereby applying pressure to the sludge to be dewatered sandwiched between the upper filter cloth 20 and the lower filter cloth 30 during the pressing dewatering section 33 for dewatering. The deviation rectifying device 70 is used to correct the positions of the upper filter cloth 20 and the lower filter cloth 30 to prevent deviation and affect the dewatering effect. The deep dewatering assembly 60 is used to complete the final dewatering treatment to reduce the moisture content of the dewatered mud cake to below 65%. The water receiving hopper 110 is used to receive the water filtered by the upper filter cloth 20 and the lower filter cloth 30, specifically the water filtered in the gravity dewatering section 31. The water receiving trough is used to receive the water flowing down from the water receiving hopper and the water filtered by the upper filter cloth 20 and the lower filter cloth 30, specifically the water filtered in the pressing dewatering section 33. The filter cloth cleaning device 90 is arranged on the circulating rotation path of the upper filter cloth 20 and the lower filter cloth 30, specifically behind the sludge discharging device 50 and in front of the feeding end, and is used to wash away the residual sludge and the like on the upper filter cloth 20 and the lower filter cloth 30. As for the structures of the upper filter cloth 20 and the lower filter cloth 30, no description and limitation are made, and they are the filter cloth, filter screen, or filter belt of the existing conventional belt type dewatering machine.

[0021] In the belt type dewatering machine in the embodiment of the present invention, compared with the existing belt type dewatering machine, the main improvement point, that is, the inventive point, lies in the deep dewatering assembly 60. In addition, the feeding and cloth feeding device 40 and the sludge discharging device 50 are also improved. Here, the applicant first explains the deep dewatering assembly 60. As Figures 1 to 3 shown, the deep dewatering assembly 60 in the embodiment of the present invention mainly includes two parts: a dewatering roller 61 and a tensioning and vibrating assembly 62. Among them, as Figure 3As shown in the figure, the dehydration roller 61 includes a roller body 611 and a mandrel 612. The roller body 611 is a roller with a relatively large outer diameter, such as 750 mm. A mandrel 612 extending axially at both ends to its outer ends is provided at the center of the roller. One end of the mandrel 612 is used to connect to a driving motor, preferably a driving reduction motor. By driving the motor to drive the roller body 611 to rotate around the axis of the mandrel 612, the upper filter cloth 20 and the lower filter cloth 30 wound around the outer periphery of the dehydration roller 61 are driven to achieve dehydration, sludge discharge, cleaning, and cyclic rotation. In the embodiment of the present invention, the complex structure of the current belt-type dehydrator that uses multiple rollers for repeated pressing is abandoned, and the above-mentioned dehydration roller 61 with a large diameter is adopted. The structure is simple and it is easier to form a large wrap angle, increasing the pressing dehydration area. The roller body 611 is provided with a plurality of drain holes 614 at intervals on its outer surface, and any drain hole 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 mandrel 612. This inner cavity is used to accommodate the water flowing in through the drain holes 614. In order to facilitate the discharge of water, a plurality of drain ports 615 communicating with the drain holes 614 and the inner cavity are also provided on the end plates 61110 at both axial ends of the roller body 611. Further, in order to increase the friction between the dehydration roller 61 and the upper filter cloth 20 and the lower filter cloth 30 to facilitate transmission, a plurality of pressing grid bars 6111 extending radially outward are also provided at intervals on the outer peripheral wall of the roller body 611. Any two adjacent pressing grid bars 6111 are located on both sides of a drain hole 614, that is, a flow guide groove 613 is defined between any two adjacent pressing grid bars 6111. The drain hole 614 is opened on the bottom surface of the flow guide groove 613. The upper filter cloth 20 and the lower filter cloth 30 are wrapped around the surface of the pressing grid bars 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 large wrap angle after clamping the dewatered sludge, and the pressing dehydration area is larger, which is more conducive to improving the dehydration effect. It should be noted that in order to make the upper filter cloth 20 and the lower filter cloth 30 at the deep dehydration assembly 60 wrap around the dehydration roller 61 and form a large wrap angle and pressing force, a guide roller 100 is respectively provided on both sides of the dehydration roller 61 (the functions of these two guide rollers 100 are not exactly the same as those of other guide rollers 100. The main purpose of other guide rollers 100 is to achieve direction change, while the purpose of these two guide rollers 100 is also to make the upper filter cloth 20 and the lower filter cloth 30 form a large wrap angle and apply a pressing force on the dehydration roller 61. For the convenience of description and distinction, these two guide rollers 100 are respectively described as the pressing front-end guide roller 63 and the pressing rear-end guide roller 64 according to the sludge conveying direction).It should be noted that in the front squeezing guide roller 63 and the rear squeezing guide roller 64 in the embodiments of the present invention, the vertical lines (not marked) passing through their respective axes all fall inside the dewatering roller 61. That is to say, the horizontal distance between the axis of the front squeezing guide roller 63 or the rear squeezing guide roller 64 and the axis of the dewatering roller 61 is less than the radius of the dewatering roller 61. In this way, the upper filter cloth 20 and the lower filter cloth 30 sandwiching the sludge to be dewatered form an inverted Ω shape when passing through the squeezing aisle, forming a large wrap angle. As for the cross-sectional shape of the squeezing grid bars 6111, no description and limitation are made. In this embodiment, it is exemplary as follows. Figure 3 As shown, it is square. As for the drain port 615, in this embodiment, it is preferably arranged circumferentially at intervals along the outer peripheral edge of the end plate 61110, and the shape is preferably semi-circular or arc-shaped. The size and quantity are not particularly limited, and those skilled in the art can select and design according to actual needs. Exemplarily Figure 3 There are 8 in the example. Among the guide rollers 100 in the embodiments of the present invention, the diameters of some guide rollers 100 are the same as those of the front squeezing guide roller 63 and the rear squeezing guide roller 64, and the diameters of some guide rollers 100 are smaller than those of the front squeezing guide roller and the rear squeezing guide roller 64. No specific description and limitation are made, and those skilled in the art can select and design according to actual needs.

[0022] The deep dewatering assembly 60 in the embodiments of the present invention is arranged above the water receiving tank 11 at the lower left end of the frame 10 as Figure 1 shown. For the tensioning vibration assembly 62, as Figure 2 and Figure 4As shown in the figure, it includes a number of rolling rollers 621, a tensioning member 623, and a high-frequency vibrator 622. The diameter of the rolling roller 621 is much smaller than that of the dehydration roller 61. Specifically, it is not limited. Optionally, the diameter of the rolling roller 621 can be one-twentieth of the diameter of the dehydration roller 61, etc. A number of rolling rollers 621 are wrapped around the outer periphery of the dehydration roller 61 through the tensioning member 623, and a gap is formed therebetween. This gap is implemented as an arc-shaped pressing passage (not labeled) for the upper filter cloth 20 and the lower filter cloth 30 that sandwich the solid to-be-dehydrated sludge formed after passing through the gravity dehydration section 31 and the pre-press dehydration section 32 to be driven through. The tensioning member 623 can adjust the gap between the number of rolling rollers 621 and the dehydration roller 61, that is, the pressing passage, so as to realize the adjustment of the pressing force. As for the number of the rolling rollers 621, no description and limitation are made. For example, the number of the rolling rollers 621 can be twelve and evenly distributed within the range of one-half of the outer circumference at the bottom of the dehydration roller 61. The high-frequency vibrator 622 is a conventional high-frequency vibrator 622 on the existing market, such as a high-frequency vibration motor, and the frequency can be selected as 50HZ. When the upper filter cloth 20 and the lower filter cloth 30 that sandwich the solid to-be-dehydrated sludge pass through the pressing passage, the pressing dehydration section 33 of the upper filter cloth 20 is wrapped around the outer peripheral surface of the dehydration roller 61, and the lower filter cloth 30 is pressed by a number of rolling rollers. The high-frequency vibrator 622 transmits the high-frequency vibration to a number of rolling rollers 621 through the tensioning member 623, so that while a number of rolling rollers 621 apply a pressing force to the solid to-be-dehydrated sludge sandwiched between the lower filter cloth 30 and the upper filter cloth 20 under the pressing and compaction of the lower filter cloth 30, the high-frequency vibration is also transmitted to the solid to-be-dehydrated sludge sandwiched between the filter cloths. The sludge generates high-frequency vibration, and the bacterial clusters in the sludge undergo a wall-breaking effect under the action of the high-frequency vibration, so that the water wrapped in the bacterial clusters is released, and thus dehydration is carried out through the secondary action of the pressing force and the vibration. Combined with the action of the flocculant in the gravity dehydration section 31, the agglomerated sludge is preliminarily dehydrated due to the action of gravity in the gravity dehydration section 31, that is, it is dehydrated once in the gravity dehydration section 31 after the flocculant, dehydrated twice in the pre-press dehydration section 32, and dehydrated three times by the rolling and high-frequency vibration wall-breaking effect of the dehydration roller 61 and the rolling rollers 621, greatly improving the dehydration effect. After testing, for the dehydrator in the embodiment of the present invention, the final dehydration treatment reduces the water content of the dewatered sludge cake to below 65%. More specifically, as Figure 4 As shown in the figure, a number of rolling rollers 621 are connected in series through a chain plate 6211, which is still different from the existing conventional chain structure. Generally, the shaft at the chain link in the existing chain does not protrude from the chain plate 6211, while the rolling roller 621 in the present application protrudes outside the chain plate 6211, that is, the diameter of the rolling roller 621 is larger than the width of the chain plate 6211. In order to enable a number of rolling rollers 621 to press tightly on the filter cloth in the pressing passage and apply a pressing force to the to-be-dehydrated sludge between the filter cloths, in the embodiment of the present invention, a number of rolling rollers 621 are fixed through a tensioning member 623. For the tensioning member 623, as Figure 4As shown, it includes two tensioning lead screws 6231, a stress-bearing crossbeam 6233 and two tensioning nuts 6232. Among the several roller mills 621, for the two outermost roller mills 621, each roller mill 621 is provided with a tensioning lead screw 6231 extending outward, and the outer end of each tensioning lead screw 6231 has a threaded section. To facilitate the fixation of the tensioning lead screw 6231, as Figure 2 shown, above the mandrel 612 in the middle of the dehydration roller 61 on the frame 10, there is a crossbeam (for the sake of distinction, this crossbeam is described as the first crossbeam 12). Two through holes (not marked) are opened on the first crossbeam 12. A tensioning conduit 121 is provided in each through hole. The outer end of each tensioning lead screw 6231 movably passes through the corresponding side of the tensioning conduit 121, and the part with the threaded section extends out of the tensioning conduit 121 and passes through and extends outside the stress-bearing crossbeam 6233 above the first crossbeam 12, and the threaded section is fixed on the stress-bearing crossbeam 6233 through the tensioning nut 6232. The bottom end of the stress-bearing crossbeam 6233 is elastically supported on the first crossbeam 12 through at least two ( Figure 4 exemplarily two in the figure) vibration isolation and tensioning air bags 6234 that can be inflated and deflated. The rolling compaction force can be adjusted by adjusting the length of the tensioning lead screw 6231 extending above the stress-bearing crossbeam 6233 and / or adjusting the inflation amount of the vibration isolation and tensioning air bag 6234. The high-frequency vibrator 622 is fixed on the stress-bearing crossbeam 6233. The high-frequency vibration generated by the high-frequency vibrator 622 is transmitted to the several roller mills 621 through the two tensioning lead screws 6231. The several roller mills 621 then act the high-frequency vibration on the bacterial clusters in the sludge to be dewatered sandwiched between the upper filter cloth 20 and the lower filter cloth 30 in the pressing dehydration section 33, so that the bacterial clusters have a cell wall breaking effect and release the water inside the cell wall. As for the material of the vibration isolation and tensioning air bag 6234, no description and limitation are made. The structure is exemplarily as Figure 4 shown, a structure of three laminated bead-like vesicles.

[0023] For the gravity dehydration section 31, the pre-pressing dehydration section 32, the pressing dehydration section 33 and the sludge discharging section 34, as Figure 1 and Figure 2 shown, in the gravity dehydration section 31, the upper filter cloth 20 and the lower filter cloth 30 face each other partially. And for this part that faces each other, along the conveying direction of the sludge, that is, the direction from feeding to sludge discharging, that is, the direction from right to left as Figure 1 shown, the upper filter cloth 20 gradually approaches the lower filter cloth 30, that is, an included angle is formed between the upper filter cloth 20 and the lower filter cloth 30. For the sake of description and distinction, this included angle is implemented as the second included angle ( Figure 2 exemplarily β in the figure). In the pre-pressing dehydration section 32, similarly, the upper filter cloth 20 gradually approaches the lower filter cloth 30, that is, an included angle is also formed between the upper filter cloth 20 and the lower filter cloth 30. For the sake of description and distinction, this included angle is described as the first included angle ( Figure 2Exemplarily in the present invention, it is α). Similarly, an included angle is also formed between the upper filter cloth 20 and the lower filter cloth 30 in the sludge discharging section 34, and this included angle is implemented as the third included angle ( Figure 2 exemplarily in the present invention, it is γ). However, the upper filter cloth 20 and the lower filter cloth 30 in the sludge discharging section 34 are gradually away from each other, that is, the third included angle is gradually increasing. Regarding 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. Specifically, no special description and limitation are made. Exemplarily, the minimum value of the second included angle β is twice the maximum value of the first included angle α, etc. A guide roller 100 is provided between the gravity dewatering section 31 and the pre-press 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 at the back. The first included angle is jointly defined by the pressing front guide roller 100, the guide roller 100 in front of it, and the dewatering roller 61 at the back. Regarding the third included angle, no limitation is made. Optionally, the minimum value of the third included angle is greater than the minimum value of the first included angle and the maximum value of the third included angle is greater than the maximum value of the first included angle. Specifically, no special limitation is made. Exemplarily, the maximum value of the third included angle is twice or three times the maximum value of the first included angle, etc. In the gravity dewatering section 31, the dehydration is completely dependent on the self-gravity of the sludge to be dehydrated that is coagulated into flocs by the action of the flocculant. Therefore, the upper filter cloth 20 does not participate in applying the pressing force in this dewatering section. While in the pre-press dewatering section 32, the upper filter cloth 20 needs to apply the pressing force. Therefore, the gap between the upper filter cloth 20 and the lower filter cloth 30 is smaller than that in the gravity dewatering section 31. In the pressing dewatering section 33, the upper filter cloth 20 and the lower filter cloth 30 are parallel and there is no included angle. In the sludge discharging section 34, the included angle is increased to facilitate the separation of the upper filter cloth 20 and the lower filter cloth 30. Since the pressing force applied between the two in the pressing dewatering section 33 is large, if the included angle between the two in the sludge discharging section 34 is small, it is not conducive to their separation, thus not conducive to discharging the sludge.

[0024] In the embodiment of the present invention, the water receiving hopper 110 is arranged obliquely downward from right to left as shown in Figure 1 the figure, extending below the right end of the frame 10 and located below the gravity dewatering section 31 and the pre-press dewatering section 32 of the lower filter cloth 30. The lower end of the water receiving hopper 110 extends above the water receiving tank 11, and the water receiving tank 11 can discharge the received water out of the dehydrator. Regarding the water receiving hopper 110, its structure is not specifically described and can be selected as the existing conventional U-shaped structure. Regarding the structure of the water receiving tank 11, no description and limitation are made either, and it can be selected as a U-shaped groove structure or an arc-shaped groove structure. Regarding the width of the water receiving hopper 110, it should not be less than the width of the lower filter cloth 30 to facilitate the water removed in the gravity dewatering section 31 and the pre-press dewatering section 32 to smoothly fall into the water receiving hopper 110.

[0025] In the embodiment of the present invention, the deviation rectifying devices 70 on the upper filter cloth 20 and the lower filter cloth 30 are identical in structure, and only the installation positions are different. For example, the deviation rectifying device 70 corresponding to the upper filter cloth 20 is installed on the top beam at the top of the frame 10, while the deviation rectifying device 70 corresponding to the lower filter cloth 30 is installed on the bottom beam. Any deviation rectifying device 70 of the present invention, such as Figure 1 shown, includes a deviation rectifying roller 71, a deviation rectifying cylinder 72, and a detection device (not shown). The deviation rectifying roller 71 is a rubber-coated roller provided to increase friction and is movable. The deviation rectifying cylinders 72 are respectively arranged at both axial ends of the deviation rectifying roller 71 and are used to drive either axial end of the deviation rectifying roller 71 to move respectively to achieve deviation rectifying adjustment. The detection device is arranged outside both axial ends of the deviation rectifying roller 71 to respectively detect whether the two sides in the width direction of the upper filter cloth 20 or the lower filter cloth 30 are displaced. The detection device is a conventional component such as a photoelectric detector on the existing market, and the specific structure and working principle are not described and limited. Those skilled in the art can easily understand and implement it. The deviation rectifying cylinder 72 is exemplarily a conventional hydraulic cylinder. In order to realize the deviation rectifying operation by the movable adjustment of the deviation rectifying roller 71, in the embodiment of the present invention, there are differences in the structures of both axial ends of the deviation rectifying roller 71. More specifically, as Figure 6 shown, a radially penetrating round hole is opened at one end of the deviation rectifying roller 71, and this round hole is implemented as a first pin hole 711. A long hole that radially penetrates and extends along the axis direction of the deviation rectifying roller 71 is opened at the other end of the deviation rectifying roller 71, and this long hole is implemented as a second pin hole 712. That is to say, 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 deviation rectifying 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 deviation rectifying roller 71 can rotate and move relative to the sliding pin 714, that is, the width of the second pin hole 712 is larger 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 a sliding bearing seat 710 (described as the first sliding bearing seat here to distinguish it from the sliding bearing seat of the tensioning device 80). That is, both axial ends of the deviation rectifying roller 71 are respectively slidably connected to a second guide frame 15 fixed on the top beam or the bottom beam of the frame 10 through the sliding bearing seat 710. Exemplarily, as Figure 5 shown, a slider structure (not shown) protruding outward can be arranged on the sliding bearing seat 710, and a chute 151 recessed inward is opened in the second guide frame 15. As an alternative embodiment, a chute 151 recessed inward can also be opened on the sliding bearing seat 710, and a slider structure (not shown) protruding outward and slidably matched with the chute 151 is arranged in the second guide frame 15. It should be noted that in the embodiment of the present invention, the sliding bearing seat 710 of the deviation rectifying roller 71 moves horizontally relative to the frame 10, that is, moves left and right as shown in the figure.

[0026] In the embodiments of the present invention, the structures of the tensioning devices 80 on the upper filter cloth 20 and the lower filter cloth 30 are the same, and the only difference lies in their different positions on the frame 10. In the embodiments of the present invention, the tensioning device 80 corresponding to the upper filter cloth 20 is arranged at the upper right of the frame 10, and the tensioning device 80 corresponding to the lower filter cloth 30 is arranged at the lower right of the frame 10. To facilitate the arrangement of the tensioning devices 80 corresponding to the upper filter cloth 20 and the lower filter cloth 30, as Figure 1 shown, there are two horizontally parallel and spaced crossbeams on the frame 10. For the sake of description and distinction, the crossbeam to which the tensioning device 80 corresponding to the upper filter cloth 20 is fixed is described as the second crossbeam 13, and the crossbeam to which the tensioning device 80 corresponding to the lower filter cloth 30 is fixed is described as the third crossbeam 14. In the embodiments of the present invention, the first crossbeam 12 is lower than the third crossbeam 14 in the height position. For the structure of any tensioning device 80, it includes a tensioning roller (not labeled) and a tensioning cylinder (not labeled). In the embodiments of the present invention, there are some differences in the structure between the tensioning roller and the deviation rectifying roller 71 of the deviation rectifying device 70. Circular holes are opened at both axial ends of the tensioning roller, and it is fixed on the sliding bearing seat (here the sliding bearing seat is described as the second sliding bearing seat, not labeled) through the positioning pins 713. The second sliding bearing seat is slidably connected within the first guide frame (not labeled) respectively fixed on the second crossbeam 13 and the third crossbeam 14. The tensioning cylinder can be selected as a conventional hydraulic cylinder on the existing market. By applying a pre-tightening force to the filter cloth through the tensioning roller, the filter cloth is tightly attached to the surfaces of each roller including the guide roller 100, the deviation rectifying roller 71, the dehydration roller 61, and the sludge discharging rollers (the upper discharging roller 52 and the lower discharging roller 53), so that the upper filter cloth 20 and the lower filter cloth 30 are in a taut state, exerting an extrusion effect on the sludge sandwiched between the upper and lower filter cloths 30. At the same time, it can also effectively achieve the deviation rectifying action, the guiding action, and the transmission, that is, being driven.

[0027] The feeding and cloth distributing device 40 in the embodiments of the present invention is arranged at the right end of the frame 10 as shown in Figure 1 shown, and its purpose is to mix the sludge to be dehydrated with the flocculant and then convey and distribute the mixture to the feeding end of the lower filter cloth 30. Specifically, its structure is as shown in Figure 7 and Figure 8As shown, it includes a feed pipe 41, a mixer 42 and a distribution mechanism 43. For the feed pipe 41, it is in an inverted L shape or a horizontal T shape, that is, the feed pipe 41 includes a vertical main pipe and a horizontal discharge pipe, and the lower end of the main pipe has a feed port 411 (for the liquid sludge to be dehydrated to enter) and a dosing port (for the flocculant to enter), wherein the feed port 411 is located at the bottom end of the feed pipe 41, and the dosing port is located on the side wall of the feed pipe 41, and the two are roughly vertically distributed, and the feed port 411 can be connected to the feed pump (not shown), and the dosing port 412 can be connected to the dosing pump (not shown). It should be noted that the feed pump and / or the dosing pump are not an integral part with the dehydrator of the embodiment of the invention, and are preferably external components. A discharge port 413 is opened at the outer end of the discharge pipe. The mixer 42 is rotatably arranged in the feed pipe 41. The feed pipe 41 and the 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, and those skilled in the art can easily understand and implement them. A material distribution mechanism 43 is provided on the lower outer side of the discharge port 413. The material distribution mechanism 43 in the embodiment of the present invention is the inventive point. The material distribution mechanism 43 in the embodiment of the present invention includes a material distribution hopper 431, an overflow weir wall 432 and a material distribution adjustment component 433. Figure 8 As shown, the cloth hopper 431 is a U-shaped structure, that is, it has a bottom surface (bottom wall) and two side surfaces (side walls), and along the discharge direction, the two side surfaces (side walls) expand outward, that is, the cloth hopper 431 is trumpet-shaped, and the width of the bottom surface (bottom wall) of the cloth hopper 431 gradually increases. Preferably, in the embodiment of the present invention, in order to make the sludge at the feed end of the upper and lower filter cloths 30 of the cloth hopper 431 uniform, which is conducive to improving the subsequent dehydration effect, in the embodiment of the present invention, the width of the outlet end of the cloth hopper 431 is about 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 arranged on the bottom surface at intervals 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 end side of the discharge direction is preferably perpendicular to the bottom surface (bottom wall) of the material distribution hopper 431, and the front end side of the discharge direction is preferably at an acute angle (not specifically described or limited, exemplified as 60°, etc.) to the bottom surface (bottom wall) of the material distribution hopper 431, and as shown in FIG. Figure 8 Any overflow weir wall 432 shown in the figure gradually decreases in height from the middle to the sides in the length direction, that is, the middle is high and the sides (i.e. Figure 8The middle position of any overflow weir wall 432 corresponds to the discharge port 413 of the feed pipe 41. Since the sludge to be dehydrated mixed with flocculant rushes to the middle position of the overflow weir wall 432 after coming out of the discharge port 413, the flow rate in the middle is the largest and the material accumulation speed is the fastest. In order to prevent the overflow in the middle from being too fast, the overflow weir wall 432 in the present application is designed to extend downward from the middle position to the two sides, that is, the middle position is the highest and the height of the two sides gradually decreases, so that the sludge that quickly piles up in the middle is diverted to both sides. Preferably, in an embodiment of the present invention, Figure 8 As shown, along the discharge direction, any overflow weir wall 432 is triangular or isosceles trapezoidal, and the height of the middle position is 1 / 3-1 / 2 higher than the height of the two side positions (here the lowest position). Such a design can make the sludge have a better mud distribution effect on the bottom surface of the distribution hopper 431. The height of the overflow weir wall 432 along the discharge direction is also different, specifically, the height gradually decreases, that is, the overflow weir wall 432 at the rear end of the discharge direction, that is, far away from the discharge port 413 of the feed pipe 41, is lower than the overflow weir wall 432 close to the discharge port 413 of the feed pipe 41, which is 1 / 3-1 / 2 lower, which means that the middle position of the overflow weir wall 432 and the lowest position on both sides are 1 / 3-1 / 2 different, that is, the two sides are symmetrical. Such a design can further make the sludge have a better mud distribution effect on the bottom surface of the distribution hopper 431. In summary, the above design can ensure that the flow rate and distribution of the sludge are uniform and cover the entire width of the cloth hopper 431. Preferably, in order to prevent the sludge falling on the filter cloth from being uneven, the embodiment of the present invention further provides a cloth adjustment component 433 at the discharge end of the cloth hopper 431. The cloth adjustment component 433 includes a cloth adjustment weir gate 4331, a counterweight adjustment rod 4332 and a first counterweight block 4333. The cloth adjustment weir gate 4331 adjusts the discharge by gravity to ensure that the sludge falling on the filter cloth is evenly distributed. Specifically, the upper end of the cloth adjustment weir gate 4331 is connected by a horizontal rotating shaft (not shown, such as Figure 7 The cloth adjusting weir gate 4331 is rotatably connected to the two side surfaces (side walls) of the cloth hopper, and the bottom surface of the cloth adjusting weir gate 4331 is in an arc shape and is in sliding contact with the bottom surface (bottom wall) of the cloth hopper 431, and a horizontal outward-facing groove is provided at both ends of the axial direction of the rotating shaft. Figure 7The leftward extending counterweight adjusting lever 4332 shown has a first counterweight 4333 with a movable position on any counterweight adjusting lever 4332. Exemplarily, the first counterweight 4333 is sleeved on the counterweight adjusting lever 4332 and a fastening screw (not labeled) is provided on the first counterweight 4333. By rotating the fastening screw, the fastening screw abuts against the counterweight adjusting lever 4332 to fix the position of the first counterweight 4333, or by rotating the fastening screw so that the fastening screw no longer abuts against the counterweight adjusting lever 4332, the first counterweight 4333 can move freely on the counterweight adjusting lever 4332. When the sludge flow rate is small, the opening degree of the cloth distribution adjusting weir gate 4331 pushed open by the self-weight of the sludge is also small. When the sludge flow rate is large, the opening degree of the cloth distribution adjusting weir gate 4331 pushed open by the self-weight of the sludge is also large. Therefore, by moving the position of the first counterweight 4333 on the counterweight adjusting lever 4332, the opening degree of the cloth distribution adjusting weir gate 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 dewatering effect of the sludge. It should be noted that in the embodiment of the present invention, a sludge cloth distribution amount can be set in advance to adjust the predetermined position of the first counterweight 4333 on the counterweight adjusting lever 4332 (specifically, when the first counterweight 4333 moves to the right, the greater the self-weight of the cloth distribution adjusting weir gate 4333, the smaller the opening degree of the cloth distribution adjusting weir gate 4333 under the same sludge flow rate, and vice versa), and the first counterweight 4333 is fixed. At this time, regardless of the sludge flow rate at the discharge port 413, the sludge cloth distribution amount is fixed after passing through the overflow weir wall 432 of the cloth distribution hopper 431 and the cloth distribution adjusting weir gate 4331, that is, the opening degree of the cloth distribution adjusting weir gate 4331 is almost unchanged, so as to ensure that the sludge is evenly distributed onto the feeding end of the lower filter cloth 30.

[0028] In the embodiment of the present invention, the sludge discharging device 50 is arranged at the left end of the frame 10 as shown in Figure 1 and is opposite to the feeding and cloth distribution device 40. Although the dewatered mud cake mainly stays on the lower filter cloth 30 due to the action of gravity, there is still mud cake remaining on the upper filter cloth 20 due to the relatively large pressure applied during the squeezing and dewatering section 33. Therefore, scraping blades need to be arranged on both the upper filter cloth 20 and the lower filter cloth 30. The specific structure of the sludge discharging device 50 in the embodiment of the present invention is as shown in Figure 9 and Figure 10As shown in the figure, it 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 application device. The support 51 is a plate structure that is roughly square and fixed to the left end of the frame 10. In the embodiment of the present invention, there are two supports 51 spaced relatively front and back at the left end of the frame 10. An upper discharge roller 52 and a lower discharge roller 53 are rotatably arranged in parallel and spaced up and down between the two supports 51. The upper filter cloth 20 comes out from the pressing rear guide roller 64, bypasses the upper discharge roller 52 and then extends upward and to the right. The lower filter cloth 30 comes out from the pressing rear guide roller 64 and bypasses the lower discharge roller 53 and then extends downward and to the right. The upper scraper 56 is installed 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 tool rest 54 is provided on the upper left side of the support 51. The upper scraper 56 is detachably installed at one end of the upper tool rest 54 facing the upper filter cloth 20, that is, the lower end. One end of the upper tool rest 54 is rotatably connected to the support 51, and the other end extends obliquely downward to the outside of the support 51, that is, to the left. Similarly, a lower tool rest 55 is provided on the lower left side of the support 51. The lower scraper 57 is detachably installed at one end of the lower tool rest 55 facing the lower filter cloth 30, that is, the upper end. One end of the lower tool rest 55 is rotatably connected to the support 51, and the other end extends obliquely upward to the outside of the support 51, that is, to the left. The force application device is installed on the support 51 and is used to apply a force to the upper scraper 56 and the lower scraper 57, so that the upper scraper 56 tends to approach the upper filter cloth 20 on the upper discharge roller 52 and the lower scraper 57 tends to approach the lower filter cloth 30 on the lower discharge roller 53, thereby improving the contact degree between the upper and lower scrapers and the upper and lower filter cloths and further improving the mud scraping effect. For the force application device, in one embodiment, as Figure 9 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, specifically as Figure 9 shown, the left end is rotatably connected to the outer end of the support 51, that is, a horizontally arranged support plate 59 at the left end as Figure 9 shown. Let the rotation connection point of the lever 581a be the fulcrum. The lengths on both sides of the fulcrum of the lever 581a are different. One end is long ( Figure 9 the right end in Figure 9 ), and the other end is short ( Figure 9 the left end in Figure 9 ). The upper pull rod 582a is rotatably connected to the lever 581a on one side of the fulcrum ( Figure 9The right end shown. Exemplarily, the second counterweight 584a is movably inserted through the right end of the lever 581a, and the second counterweight 584a is locked on the lever 581a when the lever 581a is in a horizontal balance state by a fastening screw. For example, the position of the second counterweight 584a is fixed by rotating the fastening screw so that the fastening screw abuts against the lever 581a, or the second counterweight 584a can move freely on the lever 581a by rotating the fastening screw so that the fastening screw no longer abuts against the lever 581a to achieve the force adjustment of the force applying device 58a. The second counterweight 584a adjusts the applied force while maintaining the horizontal balance of the lever 581a. In the embodiment of the present invention, both the upper pull rod 582a and the lower pull rod 583a are pull rods with adjustable lengths, for example, both are telescopic sleeve rods connected by two sections in a sleeved manner. The other end of the upper pull rod 582a is rotatably connected to the upper tool rest 54, and the other end of the lower pull rod 583a is rotatably connected to the lower tool rest 55. In the embodiment of the present invention, the force applying device 58a utilizes the principle of the lever 581a, and the adjustable-length pull rods of the upper and lower tool rests 55 are respectively connected to the lever 581a on both sides of the fulcrum. The movable second counterweight 584a is used as the acting force of the lever 581a, and the upper and lower scrapers 57 can be forced simultaneously. By moving the distance between the second counterweight 584a and the fulcrum, the best mud shoveling and cutting force can be obtained for the upper and lower scrapers 57, achieving the best mud discharging effect. When 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, and the position of the second counterweight 584a on the lever 581a can be adjusted accordingly. After determination, the second counterweight 584a can be locked. As an alternative embodiment of the force applying device, such as Figure 10As shown, the boosting device 58b includes an upper boosting spring 581b, a lower boosting spring 582b, an upper connecting rod 583b, and a lower connecting rod 584b. The upper boosting spring 581b and the lower boosting spring 582b are arranged vertically opposite to each other. A support plate 59 which is horizontally arranged and located between the upper discharging roller 52 and the lower discharging roller 53 is further provided on the support 51 (in an implementation scheme of the previous boosting device, this support plate 59 also exists and the lever 581a of the boosting device 58a is rotatably connected thereto. In this implementation scheme, the support plate 59 is used for connecting the upper boosting spring 581b and the lower boosting spring 582b). The upper end of the upper connecting rod 583b is rotatably connected to the upper tool rest 54, the lower end of the upper connecting rod 583b is connected to the upper end of the upper boosting spring 581b, and the lower end of the upper boosting spring 581b is connected to the support plate 59. Similarly, the lower end of the lower connecting rod 584b is rotatably connected to one end of the lower tool rest 55, the upper end of the lower connecting rod 584b is connected to the lower end of the lower boosting spring 582b, and the upper end of the lower boosting spring 582b is connected to the support plate 59. The upper boosting spring 581b applies a biasing force to the upper tool rest 54 to make the upper scraper 56 on the upper tool rest 54 approach the upper filter cloth 20 on the upper discharging roller 52, and the lower boosting spring 582b applies a biasing force to the lower tool rest 55 to make the lower scraper 57 on the lower tool rest 55 approach the lower filter cloth 30 on the lower discharging roller 53. In this implementation scheme, by applying biasing forces to the upper tool rest 54 and the lower tool rest 55 respectively through the upper boosting spring 581b and the lower boosting spring 582b, the contact degrees between the upper scraper 56 and the upper filter cloth 20 and between the lower scraper 57 and the lower filter cloth 30 are elastically adjusted, thereby improving the sludge scraping effect.

[0029] In summary, for the array roll backpressure belt type dewatering machine according to the embodiments of the present invention, the sediment sludge that has undergone various previous process treatments finally enters the sludge thickening tank for temporary storage and is then pumped to the dewatering machine in the dewatering workshop; the feeding and distributing device 40 on the dewatering machine will stir and mix the sludge with the flocculant and then evenly distribute it onto the lower filter cloth 30 in the gravity dewatering section 31. At this stage, due to the action of the flocculant, a large amount of free water in the sludge drains out of the mesh holes of the lower filter cloth 30 due to its own gravity and falls into the receiving hopper and then into the receiving trough. The remaining sludge that is aggregated into flocs by the action of the flocculant travels with the lower filter cloth 30 to the gradually pressurized pre-press dewatering section 32 formed by the upper filter cloth 20 and the lower filter cloth 30. As the first included angle α gradually decreases from large to small, the sludge is gradually squeezed to form a solid mud cake and then enters the press dewatering section 33. The press dewatering section 33 mainly consists of a large-diameter dewatering roll 61 and a press front guiding roll 63 and a press rear guiding roll 64 that guide the upper filter cloth 20 and the lower filter cloth 30 to form an absolute large wrap angle with the dewatering roll 61. At the same time, a number of rolling rolls are annularly arrayed on the outer side of the lower filter cloth 30 that wraps the dewatering roll 61 and are connected in series with a tensioning member 623 through side chain plates 6211. Under the action of the tensioning member 623, it is pressed tightly on the lower filter cloth 30 to form a series of rolling-roller-like secondary rolling on the sludge layer sandwiched between the upper filter cloth 20 and the lower filter cloth 30; in addition, a 50 Hz high-frequency vibrator 622 is also provided on the tensioning member 623, and the high-frequency vibration wave is transmitted to each rolling roll 621 through the tensioning member 623, so that the rolling roll 621 not only rolls the sludge layer but also makes the sludge layer generate high-frequency vibration while rolling, causing a certain degree of cell wall breaking effect on the bacterial clusters in the sludge, combining with the cell wall breaking effect of the flocculant to further separate the water in the sludge, and immediately draining out of the mesh holes of the upper filter cloth 20 and the lower filter cloth 30 under the combined extrusion of the upper filter cloth 20, the lower filter cloth 30 and the main dewatering roll 61 and flowing into the receiving water trough 11; the mud cake in the interlayer travels with the operation of the upper filter cloth 20 and the lower filter cloth 30 and is shoveled off by the mud discharging device 50 at the mud discharging port of the mud discharging section 34. The upper filter cloth 20 and the lower filter cloth 30 continue to run respectively, are regenerated by the filter cloth cleaning device 90 and then enter the next process of mud distribution, dewatering, pressing, mud discharging and cleaning, and operate continuously in such a cycle without interruption. Tensioning devices 80 are also respectively provided on the upper filter cloth 20 and the lower filter cloth 30. On the one hand, a certain pre-tensioning force is given to the filter cloth to form a frictional force between the upper filter cloth 20 and the lower filter cloth 30 and the surface of the dewatering roll 61 (which is also the main driving roll) to ensure the continuous cyclic operation of the upper filter cloth 20 and the lower filter cloth 30. On the other hand, a pressing force is also given to the sludge clamped between the upper filter cloth 20 and the lower filter cloth 30, which can independently squeeze out part of the water in the sludge and at the same time provide a suitable background environment for other dewatering processes. Deviation rectifying devices 70 and an over-deviation alarm and shutdown function (this is the prior art and not an innovation point of the present invention, so it is not described here, and those skilled in the art can easily know and implement it) are also respectively provided on the upper filter cloth 20 and the lower filter cloth 30 to ensure the continuous operation of the dewatering machine.

[0030] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An array roll backpressure belt type dehydrator, 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 conveying direction of the sludge, the part where the lower filter cloth faces the upper filter cloth is provided with a gravity dehydration section, a pre-pressure dehydration section, a squeezing dehydration section and a mud discharge section in sequence, and the belt dehydrator further comprises a deep dehydration component provided in the squeezing dehydration section, and the deep dehydration component comprises: A dewatering roller, which is driven and rotatably arranged in the frame; A tensioning vibration assembly, comprising a high-frequency vibrator and a plurality of rollers, wherein the plurality of rollers are distributed in a circular array along the periphery of the dewatering roller and a pressing passage is formed between the rollers and the peripheral wall surface of the dewatering roller, and the high-frequency vibrator transmits the high-frequency vibration waves generated by its operation to the plurality of rollers; The pressing and dewatering section is sandwiched with the sludge to be dewatered which is coagulated into flocs by a flocculant and then pre-pressed into a solid state, and is transmitted through the pressing passage. The plurality of 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 peripheral surface of the dewatering roller. The plurality of rollers apply high-frequency vibration to the sludge to be dewatered sandwiched between the lower filter cloth and the upper filter cloth, and the sludge generates high-frequency vibration, which causes the bacterial agglomerates in the sludge to have a wall-breaking effect.

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

3. The array roll backpressure belt type dehydrator according to claim 1, characterized in that, The axial ends of the plurality of rollers are connected in series through chain plates respectively. The tensioning vibration assembly further comprises a tensioning member, through which the high-frequency vibrator transmits high-frequency vibration waves to the plurality of rollers. The tensioning member comprises: Two tensioning screws, two outermost rollers among the plurality of rollers are respectively connected with one tensioning screw, and any of the tensioning screws is movably arranged in a tensioning conduit in a first crossbeam fixed above the plurality of rollers; A stressed crossbeam, the bottom end of which is elastically supported on the first crossbeam by at least two inflatable and deflable vibration-isolating and tensioning airbags, and the high-frequency vibrator is fixed on the upper surface of the stressed crossbeam; One end of the two tensioning screw rods away from the respectively connected rolling rollers passes through the load-bearing crossbeam respectively and is respectively fixed by a tensioning nut.

4. The array roll back pressure belt type dewatering machine according to claim 1, characterized in that The dewatering roller comprises a roller body which is hollow inside to form an inner cavity and a core shaft arranged on the roller body along the axis of the roller body, the axial ends of the core shaft extend outside the roller body and the outer peripheral surface of the roller body is provided with a plurality of squeezing bars protruding and extending radially outward at intervals along its circumferential direction, a guide groove is formed between any two adjacent squeezing bars and a drainage hole penetrating and communicating with the inner cavity of the roller body is formed on the groove bottom surface of the guide groove, the guide groove extends along the axial direction of the roller body, and the end plates at the axial ends of the roller body are respectively provided with a plurality of drainage ports communicating with the inner cavity; The roller body is connected to the drive motor through the core shaft and is driven by the drive motor to rotate around the axis of the core shaft. The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the core shaft.

5. The array roll backpressure belt type dewatering machine according to claim 1, characterized in that, Tensioning devices are provided on both the upper filter cloth and the lower filter cloth. The tensioning device corresponding to the upper filter cloth is fixed on the second cross beam at the upper end of the frame, and the tensioning device corresponding to the lower filter cloth is fixed on the third cross beam at the lower end of the frame. Any one of the tensioning devices includes a tensioning roller and a tensioning cylinder connected to the tensioning roller. Axial ends of any one of the tensioning rollers are respectively slidably disposed within first guide frames fixed on their respective cross beams.

6. The array roll backpressure belt type dewatering machine according to claim 1 or 5, characterized in that, Deviation rectifying devices are provided on both the upper filter cloth and the lower filter cloth. Any one of the deviation rectifying devices includes a deviation rectifying roller, a deviation rectifying cylinder connected to the deviation rectifying roller, and a detection device for detecting deviation of the upper filter cloth or the lower filter cloth. A radially penetrating first pin hole is formed at one axial end of any one of the deviation rectifying rollers, and a radially penetrating and axially extending second pin hole is formed at the other axial end. One end of the deviation rectifying roller having the first pin hole is connected to a sliding bearing seat through a positioning pin, and one end of the deviation rectifying roller having the second pin hole is connected to another sliding bearing seat through a sliding pin. The two sliding bearing seats are respectively connected to one deviation rectifying cylinder and are each slidably disposed within a second guide frame fixed on the frame. The positioning pin is rotatably connected to the first pin hole relative to the deviation rectifying roller, and the sliding pin is rotatably disposed relative to the deviation rectifying roller and slidably disposed along the extending direction of the second pin hole within the second pin hole; Detection devices are provided on both sides of the positions of the upper filter cloth and the lower filter cloth corresponding to their respective deviation rectifying rollers. Any one of the detection devices is electrically connected to the deviation rectifying cylinder on its corresponding side.

7. The array roll backpressure belt type dewatering machine according to claim 1, wherein It further includes a feeding and cloth distributing device provided at one end of the frame for mixing and transporting the sludge to be dewatered and the flocculant to the feeding end of the lower filter cloth. The feeding and cloth distributing device includes: A feeding pipe, which is in an inverted L shape or a lying T shape, and has a feeding port and a chemical adding port at its lower end and a discharging port at its upper end; A mixer, which is rotatably disposed within the feeding pipe; A cloth distributing mechanism, which is disposed at the discharging port of the feeding pipe. It includes a cloth distributing hopper extending obliquely downward from the discharging port, at least two overflow weir walls spaced along the discharging direction on the bottom surface of the cloth distributing hopper, and a cloth adjusting assembly disposed at the discharging port of the cloth distributing hopper. Among them, the width of the cloth distributing hopper gradually increases along the discharging direction. The middle position of any one of the overflow weir walls is opposite to the discharging port, and the height of any one of the overflow weir walls gradually decreases from the middle to both sides along its length direction. Along the discharging direction, the height of the overflow weir walls gradually decreases. The cloth adjusting assembly includes a cloth adjusting weir gate, a weight adjusting rod, and a first weight block. Two ends of the upper edge of the cloth adjusting weir gate are rotatably connected to both side walls of the cloth distributing hopper through rotating shafts, and the bottom edge is in contact with the bottom surface of the cloth distributing hopper. A weight adjusting rod is respectively connected to both ends of the rotating shaft. A first weight block whose position is movable and is locked after reaching a predetermined position is provided on any one of the weight adjusting rods.

8. The array roll backpressure belt type dehydrator according to claim 1, characterized in that, It further includes a mud discharging device arranged at the other end of the rack, and the mud discharging device includes: a support fixed on the rack; an upper discharging roller rotatably arranged at the upper end of the support, and the upper filter cloth bypasses the upper discharging roller and extends upward; a lower discharging roller rotatably arranged at the lower end of the support and opposite to the upper discharging roller, and the lower filter cloth bypasses the lower discharging roller and extends downward; an upper scraper installed on an upper tool rest rotatably connected at one end above the support and facing the upper filter cloth on the upper discharging roller; a lower scraper installed on a lower tool rest rotatably connected at one end below the support and facing the lower filter cloth on the lower discharging roller; a force applying device installed on the support and used to apply a force to the upper tool rest and the lower tool rest to make the upper scraper and the lower scraper on each of them approach the upper filter cloth and the lower filter cloth respectively.

9. The array roll back pressure belt type dehydrator according to claim 8, characterized in that, The force applying device includes a lever horizontally arranged between the upper discharging roller and the lower discharging roller and rotatably connected to a support plate protruding outwardly at the end of the support away from the rack, an upper pull rod with a telescopic length, one end of which is rotatably connected to the upper tool rest and the other end is rotatably connected to the lever on one side of the rotation fulcrum, a lower pull rod with a telescopic length, one end of which is rotatably connected to the lower tool rest and the other end is rotatably connected to the lever on the other side of the rotation fulcrum, and a second counterweight block which is movably adjustable in position and locked when the lever is in a horizontal balance state. The lengths of one end of the lever from its rotation fulcrum and the other end from its rotation fulcrum are different, and the second counterweight block is arranged at the end of the lever farther from its rotation fulcrum; or The force applying device includes a support plate horizontally arranged between the upper discharging roller and the lower discharging 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 tool rest through 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 tool rest through a lower connecting rod. The upper force applying spring and the lower force applying spring respectively apply a biasing force to the upper tool rest and the lower tool rest towards the upper filter cloth and the lower filter cloth.

10. The array roll backpressure belt type dewatering machine according to claim 1, characterized in that, Filter cloth cleaning devices are also respectively arranged on the upper filter cloth and the lower filter cloth. The upper filter cloth and the lower filter cloth are respectively driven through their corresponding filter cloth cleaning devices. Any one of the filter cloth cleaning devices is provided with a plurality of nozzles arranged along the width direction of the corresponding filter cloth for spraying cleaning water; and / or A water receiving hopper extending obliquely downward is also arranged below the gravity dehydration section and the pre-pressing dehydration section corresponding to the lower filter cloth in the rack. A water receiving groove is also arranged at the bottom of the rack corresponding to below the dehydration roller. The lower end of the water receiving hopper extends above the water receiving groove.

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