Belt type sludge dewatering device

Abstract

The utility model provides a belt type sludge dewatering device in the technical field of sludge dewatering, which comprises a rack, a plurality of parallel guide rollers, a plurality of parallel squeezing rollers, a plurality of parallel tensioning rollers, an upper mesh belt and a lower mesh belt. The upper mesh belt and the lower mesh belt change the direction through the guide roller, the pressing roller and the tensioning roller to form a gravity dewatering area, a wedge-shaped pre-pressing area, a high-pressure extrusion area and a mud cake discharge area in the rack, the gravity dewatering area is located at a sludge inlet in one side of the rack, and the wedge-shaped pre-pressing area is close to the gravity dewatering area and located in the middle of the rack; the high-pressure extrusion area is located above the wedge-shaped pre-pressing area, and the mud cake discharge area is close to the high-pressure extrusion area and located at the other end, away from the top gravity dehydration area, of the top of the rack; a water filtering and distributing box is fixed on the rack above the gravity dewatering area, the water filtering time and length are prolonged through the water filtering and distributing box, the fluidity of the sludge is reduced, the sludge leakage phenomenon in the subsequent dewatering process is prevented, the use is convenient, the structure is compact, and the occupied area is small.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge dehydration, in particular to a belt-type dehydration device. Background Art

[0002] For many years, sludge dewatering in sewage treatment plants has primarily relied on mechanical dewatering methods. Belt filter presses, with their simple structure, low noise, low energy consumption, large processing capacity, safe and reliable operation, and continuous operation, have become the most widely used equipment for sludge dewatering both domestically and internationally. After flocculation pretreatment, the suspended sludge enters the filter belt and undergoes gravity dewatering and wedge pre-pressing dewatering. Then, held between two polyester mesh belts, it is repeatedly squeezed by a series of dewatering rollers, increasing in size, to gradually reduce the moisture content of the sludge and form a filter cake.

[0003] Traditional belt filter presses use a gravity pre-concentration and dewatering section structure with a filter belt. Free water in the suspended slurry is removed under the action of gravity as the filter belt runs. The gravity dewatering zone usually has the largest dewatering capacity and the highest dewatering efficiency. However, the gravity dewatering effect is related to the gravity pre-dewatering time, the length of the gravity dewatering zone filter belt, the amount of flocculant added, and the permeability of the filter belt. This results in unstable dewatering of the suspended slurry at this stage. It is often the case that the moisture content of the sludge entering the wedge pre-pressing zone or the pressing zone is still high. The sludge is highly fluid, has no pressure resistance, and is easily deformed by flow, resulting in a "mud run" phenomenon. The sludge that runs out is scattered in the dewatering room, odorous, difficult to clean, and corrosive to the dewatering equipment. If the length of the gravity filtration zone is simply extended to improve the dewatering efficiency, the device will be bulky, the dewatering room will occupy a large area, and the equipment will be difficult to install and transport.

[0004] For example, a mud dewatering belt filter press disclosed in Chinese patent No. ZL202121197769.9 includes a frame, and a distributor is fixedly connected to the upper right part of the frame; a filter belt gravity dewatering mechanism for realizing gravity dewatering of the mud is arranged at the upper right part of the frame, and a single filter belt free water dewatering zone is provided in the filter belt gravity dewatering mechanism, and the free water dewatering zone is composed of a single filter belt and multiple water troughs to realize visible water separation; a filter belt squeezing dewatering mechanism is arranged at the upper left part of the frame to realize squeezing dewatering of the mud, through The distributor evenly distributes the stirred concentrated mud on the surface of the filter belt. The longer filter belt can separate the free water in the mud, reduce the fluidity of the mud entering the filter belt squeezing and dewatering mechanism, and make the mud dewatering effect better. However, simply increasing the length of the filter belt leads to an increase in the size of the equipment, a large footprint, and is very inconvenient to install and transport. At the same time, the sludge after gravity filtration only filters out part of the free water, and the water content is still high. There is still a risk of mud leakage after directly entering the filter belt squeezing and dewatering mechanism for squeezing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to reduce the water content of the sludge as much as possible before it enters the wedge-shaped pre-pressing zone. The purpose of the present invention is to provide a method of extending the dehydration time and length of the gravity dehydration zone by stacking the gravity dehydration zone upwards, thereby greatly reducing the water content in the suspended sludge and reducing its fluidity, thereby preventing the phenomenon of "mud leakage" in the subsequent sludge dehydration process and facilitating the installation and transportation of the equipment.

[0006] The technical solution adopted by the utility model is: a belt-type sludge dewatering device, comprising a frame, a plurality of parallel guide rollers, a pressing roller and a tensioning roller are installed on the frame, and an upper belt and a lower belt are also provided. The upper belt and the lower belt change their directions through the guide rollers, the pressing roller and the tensioning roller so as to form a gravity dewatering zone, a wedge-shaped pre-pressing zone, a high-pressure extrusion zone and a mud cake discharge zone in the frame. The gravity dewatering zone is located at the sludge inlet on one side of the frame, the wedge-shaped pre-pressing zone is close to the gravity dewatering zone and is located in the middle of the frame, the high-pressure extrusion zone is located above the wedge-shaped pre-pressing zone, and the mud cake discharge zone is close to the high-pressure extrusion zone and is located at the other end of the top of the frame away from the top gravity dewatering zone; the length of the gravity dewatering zone is greater than the length of the wedge-shaped pre-pressing zone, and a water filter distribution box is fixed on the frame above the gravity dewatering zone.

[0007] The belt-type sludge dewatering device provided by the utility model can achieve the following beneficial effects:

[0008] (1) The middle parts of the upper and lower mesh belts are brought closer together through the guide roller, the pressing roller and the tensioning roller to form a gravity dehydration zone, a wedge-shaped pre-pressing zone and a high-pressure extrusion zone. The water content of the sludge gradually decreases after passing through the gravity dehydration zone, the wedge-shaped pre-pressing zone and the high-pressure extrusion zone in sequence, and is finally discharged from the mud cake discharge area. The structure is compact, the footprint is small, and it is easy to install and transport.

[0009] (2) The length and time of gravity filtration in the gravity dehydration area are increased by using the filtration distribution box in the gravity dehydration area and the lower mesh belt below, so as to reduce the water content of the water-containing sludge before it enters the wedge-shaped pre-pressing area as much as possible, reduce its fluidity, and prevent the water-containing sludge from running after entering the wedge-shaped pre-pressing area or the high-pressure extrusion area.

[0010] Preferably, the water filter cloth box includes a water inlet pipe, a cloth roller, an oblique filter plate, an oblique water receiving plate, a water guide trough, a first drain pipe and a mud discharge plate; the water inlet pipe is arranged at the top of the outer side of the water filter cloth box, and the cloth roller is located at the top of the inner side of the water filter cloth box and is located on the side close to the water inlet pipe. There are multiple oblique filter plates and oblique water receiving plates and they are alternately stacked below the cloth roller. The inclination direction of the oblique filter plate is opposite to the inclination direction of the oblique water receiving plate. The oblique filter plate is located below the cloth roller, and the oblique filter plate below the cloth roller is inclined downward near one end of the cloth roller.

[0011] The multiple oblique filter plates in the water filter material box extend the length and time for the water-containing sludge to filter out free water by gravity, and at the same time facilitate the sludge and water to flow downward and be discharged separately, thereby minimizing the water content of the water-containing sludge before it enters the wedge-shaped pre-pressing area, and further reducing the fluidity of the sludge before it enters the wedge-shaped pre-pressing area and the high-pressure extrusion area, thereby preventing the occurrence of sludge leakage; the oblique water connection facilitates the discharge of the filtered water, thereby preventing the filtered water from mixing with the sludge again.

[0012] Preferably, a water collecting layer is provided on the left and right sides of the outside of the water filter cloth box, and a plurality of water guide grooves are provided in the water collecting layer. One end of the water guide groove is connected to the bottom of the inclined water receiving plate, and the other end is connected to the outer side of the water guide groove.

[0013] The water flowing down from each layer of inclined water receiving plate is received by the water guide trough and collected through the water guide trough and the water collection layer for easy discharge. While passing through multiple layers of inclined water filter plates to reduce the water content of the sludge, the filtered water is prevented from mixing with the sludge again.

[0014] Preferably, a first drain pipe is provided on the outer side of the water collecting trough on both sides of the water filtering material distribution box, and the plurality of water guide grooves are connected to the first drain pipe through a pipeline.

[0015] The sewage collected in the water guide trough and the water collecting layer is conveniently discharged to the outside of the water filter material box through the first drainage pipe.

[0016] Preferably, the mud discharge plate is located at the bottom of the water filter cloth box, the upper part of the mud discharge plate is an oblique water receiving plate, and the bottom of the mud discharge plate is inclined toward the oblique pre-pressing area.

[0017] The mud discharge plate arranged at the bottom inclined toward the pre-pressing area facilitates the downward discharge of the sludge after multiple filtrations, and allows the sludge to move with the lower mesh belt, preventing the sludge from falling onto the lower mesh belt when the amount is large, flowing around and overflowing the edge of the lower mesh belt, causing the sludge to be scattered in the dewatering room.

[0018] Preferably, the wedge-shaped pre-pressing area includes a first hollow roller and a second hollow roller, the first hollow roller is located to the lower right of the second hollow roller, and the first hollow roller and the second hollow roller are provided with a plurality of water diversion grooves arranged in an annular manner and parallel to each other on the inner side near the hollow outer surface.

[0019] The hollow outer surfaces of the first hollow drum and the second hollow drum facilitate the sludge to enter the wedge-shaped pre-pressing area, pass through the filter screen, enter the first hollow drum and the second hollow drum, and be discharged from the water diversion trough, thereby improving the dehydration efficiency of the wedge-shaped pre-pressing area.

[0020] Preferably, a first water receiving box and a second water receiving box and a second drainage pipe are further provided in the frame. The first water receiving box is in an inverted C shape and is arranged at the bottom of the wedge-shaped pre-compression area and the high-pressure extrusion area. The second water receiving box is arranged on the mesh belt between the first hollow roller and the second hollow roller and below the second hollow roller; a water baffle is provided on the first water receiving box near the top of the first hollow roller.

[0021] The first water receiving box is used to collect the water discharged from the wedge-shaped pre-pressing area and the high-pressure extrusion area; the second water receiving box is used to collect the water pre-pressed by the mesh belt between the first hollow roller and the second hollow roller and the second hollow roller; the water baffle inside the first hollow roller is used to prevent the water squeezed out by the high-pressure extrusion area from falling onto the mesh belt and the lower mesh belt on the outer surface of the first hollow roller machine, causing the sewage to mix with the sludge again and affecting the sludge dewatering effect.

[0022] Preferably, the outer diameter of the middle portion of the first hollow drum is smaller than the outer diameters of both ends of the first hollow drum.

[0023] The first hollow drum, whose middle outer diameter is smaller than the outer diameters at both ends, can concentrate the sludge in the center of the mesh belt as much as possible when the sludge enters between the upper mesh belt and the lower mesh belt below the first hollow drum, and then use the first hollow drum to squeeze and dehydrate it, so as to avoid the phenomenon that the fluidity of the sludge after only a single gravity filtration is still high, resulting in the sludge being squeezed and discharged from the edges of the upper mesh belt and the lower mesh belt and causing sludge leakage.

[0024] Preferably, the widths of the first water receiving box and the second water receiving box are both greater than the widths of the upper mesh belt and the lower mesh belt.

[0025] The first water receiving box and the second water receiving box, which are wider than the upper belt and the lower belt, facilitate receiving the water squeezed out from the upper belt and the lower belt, thereby preventing the squeezed water from falling on the upper belt or the lower belt again and affecting the dehydration effect.

[0026] Preferably, the bottom of the first water receiving box and the bottom of the second water receiving box are connected through a second drain pipe.

[0027] The sewage received in the first water receiving box and the second water receiving box can be discharged in time through the second drainage pipe to prevent the sewage from overflowing.

[0028] Preferably, the guide roller shaft above the frame is connected to a first reduction motor, and a mesh belt is wound around the outside; the guide roller shaft at the bottom of the frame is connected to a second reduction motor, and a lower mesh belt is wound around the outside, and the first reduction motor and the second reduction motor have the same speed.

[0029] The first reduction motor and the second reduction motor with the same rotation speed can synchronously drive the upper belt and the lower belt to move, so that the movement speed of the upper belt and the lower belt is the same, so that the water-containing sludge between the upper belt and the lower belt can be gradually squeezed while moving synchronously with the lower belt to facilitate water discharge.

[0030] Preferably, two scrapers are fixed to one end of the mud cake discharge zone away from the gravity dehydration zone, and the blades of the two scrapers are arranged opposite to each other and are tangent to the outer surfaces of the upper and lower mesh belts of the mud cake discharge zone respectively.

[0031] The squeezed and dehydrated sludge is scraped off from the surface of the upper and lower mesh belts by two scrapers, thereby facilitating the discharge of the dehydrated sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0034] Figure 2 It is the main view of the utility model;

[0035] Figure 3 It is a schematic cross-sectional structural diagram of the present utility model;

[0036] Figure 4 It is a schematic diagram of the three-dimensional structure of the first water receiving box and the second water receiving box in the utility model;

[0037] Figure 5 It is a cross-sectional view of the first water receiving box and the second water receiving box in the present utility model;

[0038] Figure 6 This is a schematic diagram of the three-dimensional structure of the water filter material distribution box in the utility model;

[0039] Figure 7 This is a schematic cross-sectional view of the water filter material distribution box in the utility model;

[0040] Figure 8 This is a schematic diagram of the three-dimensional structure of the first hollow drum in the utility model;

[0041] Figure 9 It is a schematic diagram of the three-dimensional structure of the second hollow drum in the utility model.

[0042] Figure numerals: 1-frame, 11-guide roller, 12-pressing roller, 13-tensioning roller, 14-upper mesh belt, 15-lower mesh belt, 16-first reduction motor, 17-second reduction motor, 2-gravity dehydration area, 21-water filter cloth box, 211-water inlet pipe, 212-closing roller, 213-oblique filter plate, 214-oblique water receiving plate, 215-water guide trough, 216-water collecting layer, 217-first drain pipe, 218-mud discharge plate, 3-wedge-shaped pre-pressing area, 31-first hollow roller, 32-second hollow roller, 312-water guide trough, 4-high-pressure extrusion area, 41-first water receiving box, 411-water baffle, 42-second water receiving box, 43-second drain pipe, 5-mud cake discharge area, 51-scraper. DETAILED DESCRIPTION

[0043] The following will be combined with the Figure 1-9 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0045] Example 1

[0046] The following is further described in conjunction with specific embodiments. Figure 1-9As shown, this embodiment is a belt-type sludge dewatering device, including a frame 1, on which are mounted a plurality of parallel guide rollers 11, a pressing roller 12 and a tensioning roller 13, an upper mesh belt 14 and a lower mesh belt 15, which change direction through the guide rollers 11, the pressing rollers 12 and the tensioning roller 13 so as to form a gravity dewatering zone 2, a wedge-shaped pre-pressing zone 3, a high-pressure squeezing zone 4 and a mud cake discharge zone 5 in the frame 1, the gravity dewatering zone 2 is located at the sludge inlet on one side of the frame 1, the wedge-shaped pre-pressing zone 3 is close to the gravity dewatering zone 2 and is located in the middle of the frame 1, the high-pressure squeezing zone 4 is located above the wedge-shaped pre-pressing zone 3, the mud cake discharge zone 5 is close to the high-pressure squeezing zone 4 and is located at the other end of the top of the frame 1 away from the top gravity dewatering zone 2; the length of the gravity dewatering zone 2 is greater than the length of the wedge-shaped pre-pressing zone 3 The length of the machine is 20 mm / s and a water filtering material distribution box 21 is fixed on the frame 1 above the gravity dewatering zone 2. The middle parts of the upper mesh belt 14 and the lower mesh belt 15 are brought close to each other through the guide roller 11, the pressing roller 12 and the tensioning roller 13 to form the gravity dewatering zone 2, the wedge-shaped pre-pressing zone 3 and the high-pressure extrusion zone 4, so that the water content of the water-containing sludge gradually decreases after passing through the gravity dewatering zone 2, the wedge-shaped pre-pressing zone 3 and the high-pressure extrusion zone 4 in sequence, and is finally discharged from the mud cake discharge zone 5. The structure is compact and easy to install and carry; the water filtering material distribution box 21 in the gravity dewatering zone 2 and the lower mesh belt 15 below increase the length and time of gravity water filtering in the gravity dewatering zone 2, reduce the water content of the water-containing sludge before entering the wedge-shaped pre-pressing zone 3 as much as possible, reduce its fluidity, and prevent the water-containing sludge from running after entering the wedge-shaped pre-pressing zone 3 or the high-pressure extrusion zone 4.

[0047] Reference Figure 6-7 As shown, in this embodiment, the water filter material distribution box 21 includes a water inlet pipe 211, a distribution drum 212, an oblique filter plate 213, an oblique water receiving plate 214, a water guide trough 215, a first drain pipe 217 and a mud discharge plate 218; the water inlet pipe 211 is arranged at the top of the outside of the water filter material distribution box 21, the distribution drum 212 is located at the top of the inside of the water filter material distribution box 21 and is located on the side close to the water inlet pipe 211, a plurality of oblique filter plates 213 and oblique water receiving plates 214 are provided and alternately stacked below the distribution drum 212, the inclination direction of the oblique filter plate 213 is opposite to the inclination direction of the oblique water receiving plate 214, and the distribution drum 215 is provided with a plurality of oblique filter plates 213 and oblique water receiving plates 214. There is an oblique filter plate 213 below the drum 212, and the oblique filter plate 213 below the cloth drum 212 is inclined downward near one end of the cloth drum 212. The multiple oblique filter plates 213 in the water filter cloth box 21 extend the length and time for the water-containing sludge to filter out free water by gravity, while facilitating the sludge and water to flow downward and be discharged respectively, thereby minimizing the water content of the water-containing sludge before it enters the wedge-shaped pre-pressing zone 3, and further reducing the fluidity of the sludge before it enters the wedge-shaped pre-pressing zone 3 and the high-pressure extrusion zone 4, thereby preventing the occurrence of sludge leakage. The oblique water connection facilitates the discharge of the filtered water, thereby preventing the filtered water from mixing with the sludge again.

[0048] Reference Figure 7 As shown, in this embodiment, a water collecting layer 216 is provided on the left and right sides of the outside of the water filter material box 21, and a plurality of water guide grooves 215 are provided in the water collecting layer 216. One end of the water guide groove 215 is connected to the bottom of the inclined water receiving plate 214, and the other end is connected to the outer side of the water guide groove 215. The water flowing down from each layer of the inclined water receiving plate 214 is respectively received by the water guide groove 215 and collected through the water guide groove 215 and the water collecting layer 216 for easy discharge. While reducing the water content of the sludge through multiple layers of inclined water filter plates, the filtered water is prevented from mixing with the sludge again.

[0049] Reference Figure 6 As shown, in this embodiment, a first drain pipe 217 is provided on the outside of the water collecting trough on both sides of the water filtration material box 21, and the multiple water guide grooves 215 are connected to the first drain pipe 217 through pipes. The first drain pipe 217 facilitates the discharge of sewage from the water guide groove 215 and the water collecting layer 216 to the outside of the water filtration material box 21.

[0050] Reference Figure 7 As shown, in this embodiment, the mud discharge plate 218 is located at the bottom of the filter water distribution box 21, and the upper part of the mud discharge plate 218 is an inclined water receiving plate 214. The bottom of the mud discharge plate 218 is inclined toward the direction of the inclined pre-pressing area. The mud discharge plate 218 inclined toward the pre-pressing area facilitates the downward discharge of the sludge after multiple filtrations, and allows the sludge to move with the lower mesh belt 15, preventing the sludge from falling onto the lower mesh belt 15 and flowing around when the amount of sludge is large, causing the sludge to overflow the edge of the lower mesh belt 15 and scatter in the dewatering room.

[0051] Reference Figure 3 and Figure 8-9 As shown, in this embodiment, the wedge-shaped pre-pressing area 3 includes a first hollow roller 31 and a second hollow roller 32. The first hollow roller 31 is located at the lower right of the second hollow roller 32. The first hollow roller 31 and the second hollow roller 32 are provided with a plurality of water diversion grooves 312 arranged in an annular manner and parallel to each other on the inner side near the hollow outer surface. The hollow outer surfaces of the first hollow roller 31 and the second hollow roller 32 facilitate the sludge to enter the wedge-shaped pre-pressing area 3, pass through the filter screen, enter the first hollow roller 31 and the second hollow roller 32 and be discharged from the water diversion groove 312, thereby improving the dehydration efficiency of the wedge-shaped pre-pressing area 3.

[0052] Reference Figure 1 and Figure 4-5As shown, in this embodiment, the frame 1 is further provided with a first water receiving box 41, a second water receiving box 42 and a second drain pipe 43. The first water receiving box 41 is in an inverted C shape and is arranged at the bottom of the wedge-shaped pre-pressing area 3 and the high-pressure extrusion area 4. The second water receiving box 42 is arranged below the mesh belt between the first hollow roller 31 and the second hollow roller 32 and the second hollow roller 32; a water baffle 411 is provided on the first water receiving box 41 near the top of the first hollow roller 31, which facilitates the collection of water discharged from the wedge-shaped pre-pressing area 3 and the high-pressure extrusion area 4 through the first water receiving box 41; the second water receiving box 42 facilitates the collection of water pre-pressed by the mesh belt between the first hollow roller 31 and the second hollow roller 32 and the second hollow roller 32; the water baffle 411 in the first hollow roller 31 prevents the water squeezed out by the high-pressure extrusion area 4 from falling onto the upper mesh belt 14 and the lower mesh belt 15 on the outer surface of the first hollow roller 31, causing the sewage to mix with the sludge again and affecting the sludge dewatering effect.

[0053] Reference Figure 8 As shown, in this embodiment, the outer diameter of the middle part of the first hollow drum 31 is smaller than the outer diameters at both ends. The first hollow drum 31 with a smaller outer diameter in the middle part can concentrate the sludge in the center of the mesh belt as much as possible when the wet sludge enters between the upper mesh belt 14 and the lower mesh belt 15 below the first hollow drum 31, and then use the first hollow drum 31 to squeeze and dehydrate it, so as to avoid the wet sludge having a high fluidity after only gravity filtration, resulting in the phenomenon of sludge running after being squeezed and flowing from the edges of the upper mesh belt 14 and the lower mesh belt 15.

[0054] Reference Figure 1 As shown, in this embodiment, the widths of the first water receiving box 41 and the second water receiving box 42 are both greater than the widths of the upper mesh belt 14 and the lower mesh belt 15. The first water receiving box 41 and the second water receiving box 42, which are greater in width than the upper mesh belt 14 and the lower mesh belt 15, facilitate receiving the water squeezed out from the upper mesh belt 14 and the lower mesh belt 15, thereby preventing the squeezed water from falling back onto the upper mesh belt 14 or the lower mesh belt 15 and affecting the dehydration effect.

[0055] Reference Figure 1 As shown, in this embodiment, the bottom of the first water receiving box 41 and the bottom of the second water receiving box 42 are connected through a second drain pipe 43. The second drain pipe 43 facilitates the timely discharge of sewage received in the first water receiving box 41 and the second water receiving box 42 at the same time to prevent sewage from overflowing.

[0056] Reference Figure 1As shown, in this embodiment, the guide roller 11 shaft above the frame 1 is connected to the first reduction motor 16, and the outer side is wound around the net belt 14; the guide roller 11 shaft at the bottom of the frame 1 is connected to the second reduction motor 17, and the outer side is wound around the lower net belt 15. The first reduction motor 16 and the second reduction motor 17 have the same rotation speed. The first reduction motor 16 and the second reduction motor 17 with the same rotation speed can synchronously drive the upper net belt 14 and the lower net belt 15 to move, so that the movement speed of the upper net belt 14 and the lower net belt 15 is the same, so that the water-containing sludge between the upper net belt 14 and the lower net belt 15 can be gradually squeezed while moving synchronously with the lower net belt 15 to facilitate water discharge.

[0057] Reference Figure 1 As shown, in this embodiment, two scrapers 51 are fixed to one end of the mud cake discharge area 5 away from the gravity dehydration area 2. The blades of the two scrapers 51 are arranged opposite to each other and are respectively tangent to the outer surfaces of the upper mesh belt 14 and the lower mesh belt 15 of the mud cake discharge area 5. The two scrapers 51 are used to scrape the squeezed and dehydrated sludge from the surfaces of the upper mesh belt 14 and the lower mesh belt 15, respectively, so as to facilitate the discharge of the dehydrated sludge.

[0058] Example 2

[0059] When the utility model is used, the first reduction motor 16 and the second reduction motor 17 drive the upper belt 14 and the lower belt 15 to rotate synchronously, and the upper belt 14 and the lower belt 15 between the guide roller 11 and between the guide roller 11 and the pressing roller 12 are straightened by the tensioning roller 13. The sewage mixed with flocculant is injected into the water filter material box 21 through the water inlet pipe 211. The muddy sewage cannot impact the rotation of the roller, and is driven by the distribution roller 212 to spread and flush the sewage to the top oblique filter plate 213, and then passes through the oblique filter plate 213. After the filter plates 213 filter out some of the free water, the sludge continues to flow downward along the oblique filter plates 213. The rotating distribution drum 212 moves the muddy sewage through the oblique filter plates 213 to filter out excess free water. The oblique water receiving plate 214 then guides the filtered free water to the first drain pipe 217 and discharges it from the gravity dewatering zone 2. During this process, the sludge flows downward layer by layer. Under the action of the mud discharge plate 218 at the bottom of the filtered water distribution box 21, the sludge after initial gravity concentration is discharged to the upper surface of the lower mesh belt 15 in the wedge-shaped pre-pressing zone 3.

[0060] The sludge moves together with the lower mesh belt 15 and the upper mesh belt, and is pre-pressed as the upper mesh belt 14 and the lower mesh belt 15 approach each other, and the water in the sludge is continuously discharged. Then, as the upper mesh belt 14 and the lower mesh belt 15 pass through the first hollow roller 31 and the second hollow roller 32 in sequence, the sludge between the upper mesh belt 14 and the lower mesh belt 15 is pre-pressed for the second time. The hollow outer surfaces of the first hollow roller 31 and the second hollow roller 32 facilitate the sewage to pass through the upper mesh belt 14 and the lower mesh belt 15, and then be discharged from the water diversion groove 312 in the second hollow roller 32 to the first water receiving box 41 and the second water receiving box 42;

[0061] After passing through the wedge-shaped pre-pressing zone 3, the sludge continues to move to the high-pressure squeezing zone 4 along with the upper mesh belt 14 and the lower mesh belt 15. The multiple squeezing rollers 12 in the high-pressure squeezing zone 4 tighten the upper mesh belt 14 and the lower mesh belt 15, squeezing the water out of the sludge. The squeezed water flows into the top of the first water receiving box 41 under the action of gravity, then flows along the water baffle 411 to the bottom of the second water receiving box 42, and finally is discharged through the second drain pipe 43.

[0062] After the squeezed sludge moves to the mud cake discharge area 5, the scraper 51 scrapes off the sludge adhering to the surface of the upper mesh belt 14 and the lower mesh belt 15 to prevent the sludge from clogging the upper mesh belt 14 or the lower mesh belt 15 and affecting the subsequent filtration effect.

[0063] The filter cloth box 21 is used to extend the length and time of filtering the muddy sewage in the gravity dehydration zone 2, thereby improving the dehydration efficiency of the gravity dehydration zone, and avoiding the phenomenon of "mud running" due to the high water content and high fluidity of the mud after entering the wedge-shaped pre-pressing zone 3. The sludge after gravity dehydration by the filter cloth device is concentrated on the middle part of the upper net belt 14 and the lower net belt 15 under the action of the first hollow drum 31, and then enters the high-pressure extrusion zone 4 after pre-pressing by the second hollow drum 32 under the pre-pressing action of the upper net belt 14 and the lower net belt 15. The first hollow drum 31 and the second hollow drum 32 with hollow outer surfaces facilitate the discharge of the pre-pressed sewage as soon as possible, and prevent the sludge entering the high-pressure extrusion zone 4 from "running mud" again when it is squeezed by the pressing drum 12 when the fluidity is high. The dehydration is convenient and fast, the structure is compact, the footprint is small, and it is easy to install and carry. It has wide promotion and application value in the technical field of sludge dewatering.

[0064] Directional terms used in this disclosure, such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," to indicate positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this disclosure. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0065] The standard parts used in this application document can all be purchased from the market, and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field. In addition, this application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A belt-type sludge dewatering device, comprising a frame (1), on which a plurality of parallel guide rollers (11), a pressing roller (12) and a tensioning roller (13) are mounted, and an upper mesh belt (14) and a lower mesh belt (15) are further provided. The upper mesh belt (14) and the lower mesh belt (15) are changed in direction by the guide rollers (11), the pressing rollers (12) and the tensioning roller (13) so as to form a gravity dewatering zone (2), a wedge-shaped pre-pressing zone (3), a high-pressure squeezing zone (4) and a mud cake discharge zone (5) in the frame (1), characterized in that: The gravity dehydration zone (2) is located at the sludge inlet on one side of the frame (1); the wedge-shaped pre-pressing zone (3) is close to the gravity dehydration zone (2) and is located in the middle of the frame (1); the high-pressure extrusion zone (4) is located above the wedge-shaped pre-pressing zone (3); the mud cake discharge zone (5) is close to the high-pressure extrusion zone (4) and is located at the other end of the top of the frame (1) away from the top gravity dehydration zone (2); the length of the gravity dehydration zone (2) is greater than the length of the wedge-shaped pre-pressing zone (3), and a water filter material distribution box (21) is fixed on the frame (1) above the gravity dehydration zone (2).

2. The belt-type sludge dewatering device according to claim 1, characterized in that: The water filter material distribution box (21) comprises a water inlet pipe (211), a material distribution drum (212), an oblique filter plate (213), an oblique water receiving plate (214), a water guide trough (215), a first drainage pipe (217) and a mud discharge plate (218); the water inlet pipe (211) is arranged at the top of the outside of the water filter material distribution box (21), and the material distribution drum (212) is located at the top of the inside of the water filter material distribution box (21) and is located near the water inlet pipe (211). ), a plurality of oblique filter plates (213) and oblique water receiving plates (214) are provided and alternately stacked below the distribution drum (212), the oblique filter plates (213) are in an opposite direction to the oblique water receiving plates (214), the oblique filter plates (213) are located below the distribution drum (212), and the oblique filter plates (213) below the distribution drum (212) are inclined downward at one end close to the distribution drum (212).

3. The belt-type sludge dewatering device according to claim 2, characterized in that: A water collecting layer (216) is provided on both the left and right sides of the exterior of the water filter material distribution box (21), and a plurality of water guide grooves (215) are provided in the water collecting layer (216). One end of the water guide groove (215) is connected to the bottom of the oblique water receiving plate (214), and the other end is connected to the outer side of the water guide groove (215).

4. The belt-type sludge dewatering device according to claim 3, characterized in that: The outer sides of the water collecting grooves on both sides of the water filtering material distribution box (21) are each provided with a first drainage pipe (217), and the plurality of water guide grooves (215) are all connected to the first drainage pipe (217) through a pipeline.

5. The belt-type sludge dewatering device according to claim 2, characterized in that: The mud discharge plate (218) is located at the bottom of the water filter material distribution box (21), and the upper part of the mud discharge plate (218) is an oblique water receiving plate (214). The bottom of the mud discharge plate (218) is inclined toward the oblique pre-pressing area.

6. The belt-type sludge dewatering device according to claim 1, characterized in that: The wedge-shaped pre-pressing area (3) comprises a first hollow roller (31) and a second hollow roller (32), wherein the first hollow roller (31) is located to the lower right of the second hollow roller (32), and a plurality of water guide grooves (312) arranged in an annular manner and arranged parallel to each other are provided on the inner sides of the first hollow roller (31) and the second hollow roller (32) near the hollow outer surfaces.

7. The belt-type sludge dewatering device according to claim 6, characterized in that: The frame (1) is further provided with a first water receiving box (41), a second water receiving box (42) and a second drainage pipe (43); the first water receiving box (41) is in an inverted C-shape and is arranged at the bottom of the wedge-shaped pre-pressing area (3) and the high-pressure extrusion area (4); the second water receiving box (42) is arranged below the mesh belt between the first hollow roller (31) and the second hollow roller (32) and the second hollow roller (32); a water baffle (411) is provided on the first water receiving box (41) near the top of the first hollow roller (31); and the outer diameter of the middle portion of the first hollow roller (31) is smaller than the outer diameters of the two ends of the first hollow roller (31).

8. The belt-type sludge dewatering device according to claim 7, characterized in that: The widths of the first water receiving box (41) and the second water receiving box (42) are both greater than the widths of the upper mesh belt (14) and the lower mesh belt (15); the bottom of the first water receiving box (41) and the bottom of the second water receiving box (42) are connected through a second drainage pipe (43).

9. The belt-type sludge dewatering device according to claim 1, characterized in that: The guide roller (11) above the frame (1) is connected to a first reduction motor (16) on its shaft, and a mesh belt (14) is wound around its outer side; the guide roller (11) at the bottom of the frame (1) is connected to a second reduction motor (17) on its shaft, and a lower mesh belt (15) is wound around its outer side; the first reduction motor (16) and the second reduction motor (17) have the same rotational speed.

10. The belt-type sludge dewatering device according to claim 1, characterized in that: Two scrapers (51) are fixed to one end of the mud cake discharge area (5) away from the gravity dehydration area (2), and the blades of the two scrapers (51) are arranged opposite to each other and are tangent to the outer surfaces of the upper mesh belt (14) and the lower mesh belt (15) of the mud cake discharge area (5).

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