Deep dehydration mechanism and belt type dehydrator with same

Abstract

The utility model discloses a deep dehydration mechanism and a belt type dehydrator with the deep dehydration mechanism, and the deep dehydration mechanism comprises a driving dehydration roller which is rotatably arranged on a rack; the plurality of grinding rollers are annularly wound on the outer side of the driving dewatering roller, a squeezing passage is formed by the grinding rollers and the outer surface of the driving dewatering roller, and the upper filter cloth and the lower filter cloth penetrate through the squeezing passage in a transmission manner; the tensioning assembly is connected with the plurality of grinding rollers and applies tensioning force to the plurality of grinding rollers; the high-frequency vibrator is arranged on the tensioning assembly and transmits high-frequency vibration waves to the grinding rollers so that the high-frequency vibration waves can act on the cenobium in the sludge and wall breaking of the cenobium can be achieved. The large-diameter driving dewatering roller is adopted and combined with high-frequency vibration tensioning, the filter cloth has a larger wrap angle and a larger squeezing dewatering area during deep dewatering, cenobium in sludge generates a wall breaking effect under the rolling pressing force of the grinding roller and the high-frequency vibration effect, so that water wrapped in the cenobium is separated out, and the dewatering effect is greatly improved. The dewatering efficiency is high, the structure is simple and the practicability is strong.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, specifically to a deep dehydration mechanism and a belt dehydrator having the same. Background Technology

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

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

[0004] Belt sludge dewatering machines are devices used to treat sludge, commonly found in wastewater treatment plants, chemical plants, and paper mills. Traditional belt sludge dewatering machines often leave sludge cakes with high moisture content after processing. To address this issue, Chinese patent document CN116022989B discloses a high-dryness, high-pressure belt sludge dewatering machine. Based on traditional belt dewatering machines, this design incorporates more pressing rollers, a denser roller arrangement, and a larger wrap angle, resulting in lower sludge moisture content. While this belt sludge dewatering machine achieves good dewatering results, with a sludge moisture content reaching 60%, its high-pressure pressing filter belt device consists of only two rows of pressing rollers, with a smaller spacing (or arrangement density) compared to the initial pressing filter belt device. This increases the wrap angle, tension, and shear force. While this structure can improve dewatering efficiency, the multiple pressing rollers increase the size of the equipment, at least in the length direction, leading to higher costs. Furthermore, it cannot remove moisture from the cell walls of sludge bacterial flocs, requiring further improvement. Therefore, this invention was developed. Utility Model Content

[0005] In view of at least one of the above-mentioned technical problems, the purpose of this utility model is to provide a deep dehydration mechanism and a belt dehydrator having the same.

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

[0007] One objective of this utility model is to provide a deep dewatering mechanism for a belt dewatering machine. The belt dewatering machine includes a frame and upper and lower filter cloths mounted on the frame. Along the sludge conveying direction, it sequentially comprises a gravity dewatering section, a pre-compression dewatering section, a pressing dewatering section, and a sludge discharge section. The deep dewatering mechanism is located in the pressing dewatering section and includes:

[0008] A drive dewatering roller is rotatably mounted on the frame;

[0009] Several rollers are arranged in a ring around the outside of the driving dewatering roller and form a pressing passage with the outer surface of the driving dewatering roller. The upper filter cloth and the lower filter cloth enclose the sludge to be dewatered and pass through the pressing passage in a driving manner. The outer surface of the upper filter cloth is in frictional contact with the outer surface of the driving dewatering roller and the several rollers are pressed against the outer surface of the lower filter cloth.

[0010] A tensioning assembly is connected to the plurality of rollers and applies a tensioning force to the plurality of rollers such that the plurality of rollers press and squeeze the outer surface of the lower filter cloth.

[0011] A high-frequency vibrator is mounted on the tensioning assembly and transmits high-frequency vibration waves to the plurality of rollers through the tensioning assembly to act on the bacterial flocs in the sludge and cause the bacterial flocs to break down.

[0012] Preferably, the driving dewatering roller includes a hollow roller body with an inner cavity, a spindle mounted on the roller body along the axis of the roller body, and a drive motor for driving the spindle and the roller body to rotate around the axis of the spindle or the roller body to drive the upper and lower filter cloths containing the sludge to be dewatered. The axial ends of the spindle extend outside the roller body, and the outer circumferential surface of the roller body is provided with a plurality of pressing bars that extend radially outward at intervals along its circumference. A guide groove is formed between any two adjacent pressing bars, and the bottom surface of the guide groove has a through-hole that communicates with the inner cavity of the roller body. The guide groove extends along the axial direction of the roller body, and the end plates at both axial ends of the roller body are respectively provided with a plurality of drain ports that communicate with the inner cavity.

[0013] The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the mandrel.

[0014] Preferably, the cross-section of the pressing grid is square or trapezoidal.

[0015] Preferably, a plurality of the drain outlets are evenly spaced along the outer periphery of the end plates at both ends of the roller body along the axial direction; and / or

[0016] The shape of any of the drain outlets is semi-circular or arc-shaped.

[0017] Preferably, any two adjacent rollers among the plurality of rollers are connected in series by a chain plate.

[0018] Preferably, the width of any of the chain plates is smaller than the diameter of the roller.

[0019] Preferably, the tensioning assembly includes two tensioning screws, a force-bearing crossbeam, and at least two vibration-damping tensioning airbags;

[0020] The two tensioning screws are respectively fixed on the two outermost rollers among the plurality of rollers and extend outwards respectively. The outer peripheral surface of the end of any tensioning screw away from the roller to which it is connected has a threaded section.

[0021] The load-bearing crossbeam is elastically supported on the frame crossbeam located below the load-bearing crossbeam by the at least two vibration-damping airbags, and the high-frequency vibrator is fixed above the load-bearing crossbeam.

[0022] The at least two vibration isolation and tensioning airbags are arranged at intervals, and any one of the vibration isolation and tensioning airbags can be filled with gas.

[0023] Two tensioning guide tubes are fixed at intervals on the frame beam. The two tensioning screws are inserted into the two tensioning guide tubes one by one and pass through the load-bearing beam. They are then locked by tensioning nuts to their respective threaded sections.

[0024] Preferably, it further includes a first guide roller at the front end of the pressing passage and a second guide roller at the rear end. The first guide roller and the second guide roller are arranged symmetrically about the vertical line passing through the axis of the dewatering roller, and the horizontal distance between the axis of the first guide roller and the axis of the driving dewatering roller and the horizontal distance between the axis of the second guide roller and the axis of the driving dewatering roller are both smaller than the radius of the driving dewatering roller.

[0025] Preferably, the high-frequency vibrator is a high-frequency vibration motor.

[0026] Another objective of this invention is to provide a belt dewatering machine, including the deep dewatering mechanism described in any of the above-mentioned claims.

[0027] Compared with the prior art, the advantages of this utility model are:

[0028] This invention relates to a deep dewatering mechanism and a belt dewatering machine incorporating it. It replaces multiple existing pressing rollers with a large-diameter drive dewatering roller, combined with high-frequency vibration tensioning. During deep dewatering, the filter cloth has a larger wrap angle and pressing dewatering area. Under the crushing force of the rollers and the high-frequency vibration, the bacterial cells within the sludge undergo a cell-wall breaking effect, causing the water trapped within to be released, significantly improving the dewatering effect. Testing shows that the moisture content of the sludge cake is reduced to below 65%. It features high dewatering efficiency, simple structure, and strong practicality. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Figure 1 This is a schematic diagram of the deep dehydration mechanism according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the drive dewatering roller of the deep dewatering mechanism in an embodiment of the present utility model.

[0032] Figure 3 This is a schematic diagram of the structure of the roller, tensioning assembly and high-frequency vibrator combination of the deep dehydration mechanism in an embodiment of the present invention.

[0033] The components are as follows: 10. Deep dewatering mechanism; 11. Drive dewatering roller; 111. Roller body; 1110. End plate; 1111. Pressing grid; 112. Mandrel; 113. Guide groove; 114. Drainage hole; 115. Drain outlet; 12. Grinding roller; 121. Chain plate; 13. Tensioning assembly; 131. Tensioning screw; 132. Force-bearing crossbeam; 133. Vibration-isolated tensioning airbag; 134. Tensioning nut; 135. Tensioning guide tube; 14. High-frequency driver; 15. First guide roller; 16. Second guide roller; 20. Frame; 21. Frame crossbeam; 30. Upper filter cloth; 40. Lower filter cloth; 50. Sludge to be dewatered; 60. Guide roller. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0035] See Figures 1 to 3This utility model discloses a deep dewatering mechanism for a belt dewatering machine. The belt dewatering machine of this embodiment includes a frame 20, an upper filter cloth 30, a lower filter cloth 40, and the deep dewatering mechanism 10 described in the previous embodiment. The upper filter cloth 30 and the lower filter cloth 40 are respectively guided by a plurality of guide rollers 60 disposed on the frame 20. Figure 1 The diagram only shows one guide roller 60, forming a closed-loop transmission structure. The upper filter cloth 30 and the lower filter cloth 40 are arranged vertically opposite each other, and a portion of their working surfaces are arranged facing each other. This portion is along the sludge conveying direction, i.e., as shown in the diagram. Figure 1 The sections shown, from right to left, are designated as gravity dewatering section a, pre-compression dewatering section b, pressing dewatering section c, and sludge discharge section d. In the first and second sections, gravity dewatering section a and sludge discharge section d, the upper filter cloth 30 and lower filter cloth 40 do not apply pressure to the sludge 50 to be dewatered between them. In the middle two sections, pre-compression dewatering section b and pressing dewatering section c, the sludge 50 to be dewatered is clamped and pressure is applied for dewatering. That is, in pre-compression dewatering section b, the upper filter cloth 30 and lower filter cloth 40 have a gradually decreasing angle, while in pressing dewatering section c, the upper filter cloth 30 and lower filter cloth 40 are parallel. As for the frame 20, it is a cuboid frame structure assembled from multiple crossbeams and longitudinal beams; its specific details are not described or limited and are not the inventive point of this utility model. As for the upper filter cloth 30 and the lower filter cloth 40, they are conventional filter cloth, filter screen or filter belt structures used in existing belt dewatering machines, and are not the inventive point of this utility model. They will not be described or limited here, and those skilled in the art will easily know them.

[0036] In this embodiment, the array roller tensioning device is installed in the pressing and dewatering section c. The deep dewatering mechanism 10 in this embodiment includes a drive dewatering roller 11, a plurality of rollers 12, a tensioning assembly 13, and a high-frequency vibrator. The drive dewatering roller 11 is rotatably mounted on the frame 20. The plurality of rollers 12 are arranged in a ring around the outside of the drive dewatering roller 11 and form a pressing passage with the outer surface of the drive dewatering roller 11. The upper filter cloth 30 and the lower filter cloth 40 enclose the sludge 50 to be dewatered and drive through the pressing passage. The outer surface of the upper filter cloth 30 is in frictional contact with the outer surface of the drive dewatering roller 11, and the plurality of rollers 12 are pressed against the outer surface of the lower filter cloth 40. The tensioning assembly 13 is connected to the plurality of rollers 12 and applies a tensioning force to the plurality of rollers 12, causing the plurality of rollers 12 to press and tighten against the outer surface of the lower filter cloth 40. A high-frequency vibrator is mounted on the tensioning assembly 13, which transmits high-frequency vibration waves to several rollers 12 to act on the bacterial clusters in the sludge, causing cell wall disruption and releasing water trapped within the cell walls, thereby improving the dewatering effect. Tests show that after deep dewatering by the deep dewatering mechanism 10 of this embodiment, the moisture content of the dewatered sludge cake is reduced to below 65%.

[0037] Specifically, such as Figure 2As shown, the driving dewatering roller 11 of this embodiment includes a roller body 111 and a spindle 112. The roller body 111 is a roller with a relatively large outer diameter, such as 750 mm. A spindle 112 is provided at the center of the roller, extending axially to both ends. One end of the spindle 112 is connected to a drive motor, preferably a drive reduction motor. The drive motor drives the roller body 111 to rotate around the axis of the spindle 112, thereby driving the upper filter cloth 30 and lower filter cloth 40 surrounding the outer circumference of the driving dewatering roller 11 to achieve dewatering, mud unloading, washing, and circulation. This embodiment of the present invention abandons the complex structure of the current belt dewatering machine that uses multiple rollers for repeated pressing, and replaces it with the above-mentioned large-diameter driving dewatering roller 11, which has a simple structure and is easier to form a large wrap angle, increasing the pressing and dewatering area. The roller body 111 has a plurality of drainage holes 114 spaced apart on its outer surface, and any one of the drainage holes 114 extends along the axial direction of the roller body 111. The roller body 111 is hollow, that is, an inner cavity is formed between the inner peripheral wall of the roller body 111 and the outer peripheral wall of the spindle 112. The inner cavity is used to contain water flowing in through the drainage holes 114. In order to facilitate the drainage of water, a plurality of drainage outlets 115 communicating with the drainage holes 114 and the inner cavity are also provided on the end plates 1110 at both ends of the roller body 111 in the axial direction. Furthermore, in order to improve the friction between the driving dewatering roller 11 and the upper filter cloth 30 and the lower filter cloth 40, thereby facilitating transmission, a number of pressing grids 1111 extending outward in the radial direction are provided at intervals on the outer peripheral wall of the roller body 111. Any two adjacent pressing grids 1111 are located on both sides of a drain hole 114, that is, a guide groove 113 is defined between any two adjacent pressing grids 1111. The drain hole 114 is opened on the bottom surface of the guide groove 113. The upper filter cloth 30 and the lower filter cloth 40 wrap around the surface of the pressing grids 1111 of the roller body 111. Since the diameter of the roller body 111 is large, the upper filter cloth 30 and the lower filter cloth 40 form a larger wrap angle after clamping the dewatered sludge, resulting in a larger pressing and dewatering area, which is more conducive to improving the dewatering effect. It should be noted that, in order to ensure that the upper filter cloth 30 and lower filter cloth 40 at the deep dewatering mechanism 10 wrap around the drive dewatering roller 11 and form a larger wrap angle and clamping force, a guide roller 60 is provided on each side of the drive dewatering roller 11. (The function of these two guide rollers 60 is not entirely the same as that of the other guide rollers 60. The main purpose of the other guide rollers 60 is to guide, while the purpose of these two guide rollers 60 is to ensure that the upper filter cloth 30 and lower filter cloth 40 form a larger wrap angle and apply clamping force on the drive dewatering roller 11. For ease of description and distinction, these two guide rollers 60 are arranged according to the sludge conveying direction, i.e., as shown in the diagram.) Figure 1 The directions from right to left shown are respectively described as the first guide roller 15 and the second guide roller 16. It should be noted that in this embodiment of the present invention, the vertical lines passing through the respective axes of the first guide roller 15 and the second guide roller 16 (…) Figure 1In the example, L1 and L2 both fall inside the drive dewatering roller 11. Figure 1 The vertical line of the axis of the drive dewatering roller 11 is exemplarily L0, that is, the horizontal distance between the axis of the first guide roller 15 or the second guide roller 16 and the axis of the drive dewatering roller 11 is ( Figure 1 In this example, D) is smaller than the radius R of the driving dewatering roller 11, so that the upper filter cloth 30 and lower filter cloth 40, which enclose the sludge 50 to be dewatered, form an inverted Ω shape as they pass through the pressing passage, creating a large wrapping angle. The cross-sectional shape of the pressing grid bars 1111 is not described or limited; in this embodiment, an example is shown below. Figure 2 The diagram shows a square shape. Regarding the drain outlets 115, in this embodiment, they are preferably arranged circumferentially along the outer periphery of the end plate 1110, and their shape is preferably semi-circular or arc-shaped. The size and number are not particularly limited; those skilled in the art can select and design them according to actual needs. (Example provided) Figure 2 There are 8 in the middle.

[0038] For roller 12, such as Figure 3 As shown, the diameter of the grinding roller 12 is much smaller than that of the driving dewatering roller 11. The specific diameter is not limited; it can be selected as one-twentieth the diameter of the driving dewatering roller 11. Several grinding rollers 12 are wrapped around the outer circumference of the driving dewatering roller 11 by a tensioning assembly 13, with a gap between them. This gap is implemented as an arc-shaped pressing passage (not shown) through which the upper filter cloth 30 and lower filter cloth 40, which have solidified after passing through gravity dewatering section a and pre-compression dewatering section b, pass. The tensioning assembly 13 can adjust the gap between the grinding rollers 12 and the driving dewatering roller 11, i.e., the pressing passage, thereby adjusting the pressing force. The number of grinding rollers 12 is not described or limited; for example, twelve grinding rollers 12 evenly distributed around the bottom outer circumference of the driving dewatering roller 11 are acceptable. The high-frequency vibrator is a conventional high-frequency vibrator available on the market, such as a high-frequency vibrating motor, with a frequency of 50Hz.

[0039] More specifically, such as Figure 3 As shown, several rollers 12 are connected in series by a chain plate 121, forming a series connection between any two adjacent rollers 12. This differs from conventional chain structures, where the shaft at the chain link generally does not protrude beyond the chain plate 121. However, the rollers 12 in this application protrude beyond the chain plate 121, meaning the diameter of the rollers 12 is larger than the width of the chain plate 121. To ensure that the rollers 12 can press firmly onto the filter cloth in the pressing passage and apply pressure to the sludge 50 to be dewatered between the filter cloths, in this embodiment, the rollers 12 are fixed by a tensioning assembly 13. Regarding the tensioning assembly 13, as... Figure 3As shown, it includes two tensioning screws 131, a force-bearing crossbeam 132, at least two vibration-damping tensioning airbags 133, and two tensioning nuts 134. Among the plurality of rollers 12, the two outermost rollers 12 each have an outwardly extending tensioning screw 131. The outermost end of each tensioning screw 131, away from its connected roller 12, has a threaded section (not shown). To facilitate the fixing of the tensioning screws 131, such as... Figure 1 and Figure 3 As shown, a horizontal frame beam is located above the mandrel 112 in the middle of the drive dewatering roller 11 on the frame 20. Two through holes (not shown) are formed on the frame beam, each containing a tension guide tube 135. The outer end of each tension screw 131 is movably inserted into the corresponding tension guide tube 135, with a threaded portion extending beyond the tension guide tube 135 and passing through and extending to the load-bearing beam 132 located above the frame beam. The threaded portion is fixed to the load-bearing beam 132 by a tension nut 134. The bottom end of the load-bearing beam 132 is connected by at least two (… Figure 3 (Example: Two) Inflatable and deflated vibration-damping tensioning airbags 133 are elastically supported on the crossbeam of the frame 20. The compaction force can be adjusted by adjusting the tensioning nut 134 to extend the tensioning screw 131 above the load-bearing crossbeam 132 and / or by adjusting the inflation amount of the vibration-damping tensioning airbags 133.

[0040] A high-frequency vibrator is fixed to a load-bearing crossbeam 132. The high-frequency vibration generated by the vibrator is transmitted to several rollers 12 via two tensioning screws 131. The rollers 12 then apply the high-frequency vibration to the bacterial cells within the sludge 50 to be dewatered, which are sandwiched between the pressing and dewatering sections of the upper filter cloth 30 and the lower filter cloth 40. This causes the bacterial cells to undergo a cell wall disruption effect, releasing water from their cell walls. The material of the vibration-damping tensioning airbag 133 is not described or limited; its structure is exemplified as follows: Figure 3 The diagram shows three stacked, bead-like vesicle structures.

[0041] In the deep dewatering mechanism 10 of this utility model embodiment, when the upper filter cloth 30 and the lower filter cloth 40, which contain solid sludge 50 to be dewatered, pass through the pressing passage, the pressing and dewatering section of the upper filter cloth 30 is wrapped around the outer periphery of the driving dewatering roller 11, while the lower filter cloth 40 is crushed by several rollers. The high-frequency vibrator transmits high-frequency vibration to several rollers 12 through the tensioning component 13. This causes the rollers 12 to apply a crushing and compacting force to the solid sludge 50 sandwiched between the lower filter cloth 40 and the upper filter cloth 30 while simultaneously transmitting high-frequency vibration to the solid sludge 50 sandwiched between the filter cloths. The sludge generates high-frequency vibration, and the bacterial flocs within the sludge undergo a cell-wall breaking effect under the action of high-frequency vibration, releasing the water trapped within the bacterial flocs. Thus, dewatering is achieved through the crushing and compacting force and the secondary action of vibration. Combined with the action of the flocculant in the gravity dewatering section a, the sludge that has agglomerated undergoes preliminary dewatering in the gravity dewatering section a due to gravity. That is, after the flocculant, the sludge undergoes primary dewatering in the gravity dewatering section a, secondary dewatering in the pre-compression dewatering section b, and tertiary dewatering through the crushing of the driving dewatering rollers 11 and rollers 12 and the cell-wall breaking effect of high-frequency vibration, which greatly improves the dewatering effect. Testing revealed that the dewatering machine of this embodiment reduces the moisture content of the dewatered cake to below 65% after final dewatering. Furthermore, the deep dewatering mechanism 10 of this invention has a relatively simple structure for deep dewatering, occupying minimal space in the frame 20, at least in the length direction.

[0042] This utility model embodiment also provides a belt dewatering machine, including the deep dewatering mechanism 10 of the above embodiment. Other structures of the belt dewatering machine, such as mechanisms for achieving alignment, tensioning, sludge unloading, and cleaning, are not described or limited, and are not the inventive points of this utility model. Since it possesses the deep dewatering mechanism 10 of the above embodiment, it at least has the beneficial effects of the above embodiment, and will not be elaborated upon here.

[0043] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A deep dewatering mechanism for a belt dewatering machine, the belt dewatering machine comprising a frame and upper and lower filter cloths disposed on the frame, and sequentially arranged along the sludge conveying direction as a gravity dewatering section, a pre-compression dewatering section, a pressing dewatering section, and a sludge discharge section, characterized in that, The deep dehydration mechanism is located in the pressing and dehydration section and includes: A drive dewatering roller is rotatably mounted on the frame; Several rollers are arranged in a ring around the outside of the driving dewatering roller and form a pressing passage with the outer surface of the driving dewatering roller. The upper filter cloth and the lower filter cloth enclose the sludge to be dewatered and pass through the pressing passage in a driving manner. The outer surface of the upper filter cloth is in frictional contact with the outer surface of the driving dewatering roller and the several rollers are pressed against the outer surface of the lower filter cloth. A tensioning assembly is connected to the plurality of rollers and applies a tensioning force to the plurality of rollers such that the plurality of rollers press and squeeze the outer surface of the lower filter cloth. A high-frequency vibrator is mounted on the tensioning assembly and transmits high-frequency vibration waves to the plurality of rollers through the tensioning assembly to act on the bacterial flocs in the sludge and cause the bacterial flocs to break down.

2. The deep dehydration mechanism according to claim 1, characterized in that, The driving dewatering roller includes a hollow roller body with an inner cavity, a spindle mounted on the roller body along the axis of the roller body, and a drive motor that drives the spindle and the roller body to rotate around the axis of the spindle or the roller body to drive the upper and lower filter cloths containing the sludge to be dewatered. The axial ends of the spindle extend outside the roller body, and the outer circumferential surface of the roller body is provided with a plurality of pressing bars that extend radially outward at intervals along its circumference. A guide groove is formed between any two adjacent pressing bars, and the bottom surface of the guide groove has a through-hole that communicates with the inner cavity of the roller body. The guide groove extends along the axial direction of the roller body, and the end plates at both axial ends of the roller body are respectively provided with a plurality of drain ports that communicate with the inner cavity. The inner cavity is defined by the inner peripheral wall of the roller body and the outer peripheral wall of the mandrel.

3. The deep dehydration mechanism according to claim 2, characterized in that, The cross-section of the pressing grid is square or trapezoidal.

4. The deep dehydration mechanism according to claim 2, characterized in that, Several of the drainage outlets are evenly spaced along the outer periphery of the end plates at both ends of the roller body along the axial direction; and / or The shape of any of the drain outlets is semi-circular or arc-shaped.

5. The deep dehydration mechanism according to claim 1, characterized in that, Any two adjacent rollers among the plurality of rollers are connected in series by a chain plate.

6. The deep dehydration mechanism according to claim 5, characterized in that, The width of any of the chain plates must be smaller than the diameter of the roller.

7. The deep dehydration mechanism according to claim 1, characterized in that, The tensioning assembly includes two tensioning screws, a force-bearing crossbeam, and at least two vibration-damping tensioning airbags. The two tensioning screws are respectively fixed on the two outermost rollers among the plurality of rollers and extend outwards respectively. The outer peripheral surface of the end of any tensioning screw away from the roller to which it is connected has a threaded section. The load-bearing crossbeam is elastically supported on the frame crossbeam located below the load-bearing crossbeam by the at least two vibration-damping airbags, and the high-frequency vibrator is fixed above the load-bearing crossbeam. The at least two vibration isolation and tensioning airbags are arranged at intervals, and any one of the vibration isolation and tensioning airbags can be filled with gas. Two tensioning guide tubes are fixed at intervals on the frame beam. The two tensioning screws are inserted into the two tensioning guide tubes one by one and pass through the load-bearing beam. They are then locked by tensioning nuts to their respective threaded sections.

8. The deep dehydration mechanism according to any one of claims 1-7, characterized in that, It also includes a first guide roller at the front end of the pressing passage and a second guide roller at the rear end. The first guide roller and the second guide roller are arranged symmetrically about the vertical line passing through the axis of the dewatering roller, and the horizontal distance between the axis of the first guide roller and the axis of the driving dewatering roller and the horizontal distance between the axis of the second guide roller and the axis of the driving dewatering roller are both smaller than the radius of the driving dewatering roller.

9. The deep dehydration mechanism according to claim 1, characterized in that, The high-frequency vibrator is a high-frequency vibration motor.

10. A belt dewatering machine, characterized in that, Includes the deep dehydration mechanism as described in any one of claims 1-9.

Images