Laminated spiral dehydrator

Abstract

The invention discloses a laminated spiral dehydrator, which relates to the technical field of dehydrators and comprises a dehydrator body, two or more than two spiral shafts and a first driving device, the spiral shafts are rotationally connected with the machine body, the two or more spiral shafts are distributed up and down, and spiral pieces of the adjacent spiral shafts are staggered and embedded with each other; a feeding port and a discharging port are formed in the two ends of the machine body respectively, and a back pressure plate is arranged on the outer side of the machine body. The device further comprises a mud pressing structure. The filter module comprises two groups or more than two groups of movable components; the first driving device is used for driving the two or more spiral shafts to rotate synchronously. The sludge dewatering effect can be effectively improved, the sludge blocking blind area at the tail end of the filtering cavity is effectively eliminated, and meanwhile the moisture content of sludge cakes discharged after sludge dewatering can be lower.

Description

Technical Field

[0001] The present application relates to the technical field of dehydrators, and in particular to a laminated spiral dehydrator. Background Art

[0002] The laminated spiral dehydrator is a new type of solid-liquid separation equipment, which is widely used in the field of sewage treatment. It uses the principle of screw extrusion to generate a strong extrusion force through the change of screw diameter and pitch, as well as the tiny gap between the floating ring and the fixed ring to achieve extrusion dehydration of sludge.

[0003] The existing Chinese invention patent with announcement number CN113580639A discloses a vertical spiral spiral solid-liquid separator, including a filter chamber, a spiral shaft, a driving device, and a plurality of support plates; the filter chamber, the spiral shaft and the driving device are supported and positioned by the plurality of support plates; the spiral shaft runs through the filter chamber; the spiral shafts are two or more, and are arranged vertically from top to bottom in the filter chamber; the spiral blades of the two adjacent spiral shafts are embedded in each other; the shape of each ring in the first closed ring group and the second closed ring group matches the shape of the vertically arranged spiral shaft. The vertical arrangement of the spiral shafts of the present invention makes the solid-liquid separator occupy a smaller area, and multiple dehydrators can be designed side by side, which greatly improves the space utilization rate, increases the water passage area on both sides of the filter chamber, and enables the filtered water to be discharged in time, thereby improving the work efficiency.

[0004] Although the filtrate after the initial treatment of the sewage is precipitated inside the above-mentioned laminated spiral dewatering machine, more sludge will accumulate at the bottom of the internal space of the dewatering machine, making it easy for the sludge at the bottom of the internal space of the dewatering machine to accumulate and clog the outlet, affecting the mud discharge. At the same time, the dehydration efficiency of the sludge at the top of the internal space of the dewatering machine is low, resulting in a high water content in the mud cake finally discharged. Summary of the invention

[0005] The present application provides a laminated spiral dewatering machine, which can effectively improve the dewatering effect of the sludge located at the top of the interior, facilitate the sludge discharge, and thus further reduce the moisture content of the mud cake finally discharged.

[0006] The present application provides a laminated spiral dehydrator, which adopts the following technical solution: A laminated spiral dehydrator comprises a machine body, two or more spiral shafts and a first driving device; The body has a filter cavity inside, the spiral shaft is arranged in the filter cavity, two or more spiral shafts are distributed up and down, and the spiral sheets of adjacent spiral shafts are staggered and interlocked with each other; The two ends of the machine body are respectively provided with a feed port and a discharge port which are communicated with the filter cavity, the discharge port is located at the bottom of the machine body and corresponds to the end of the spiral shaft located at the bottom, and the machine body is provided with a back pressure plate on the outside of the discharge port, and the sludge is discharged from the gap between the discharge port and the back pressure plate; It also includes a mud pressing structure for further pressurizing the sludge, wherein the mud pressing structure is located at one end of the filter chamber close to the discharge port and above the discharge port; The first driving device is used to drive two or more of the screw shafts to rotate synchronously.

[0007] By adopting the above technical scheme, when the filtrate is separated into solid and liquid in the filter chamber, the liquid will be discharged through the filter slit under the action of its own gravity, and at the same time, the sludge in the filtrate will be fully dehydrated under the squeezing of the spiral shaft, which can accelerate the efficiency of solid-liquid separation of the filtrate and effectively improve the dehydration effect of the sludge at the top of the interior, facilitate the discharge of the sludge, thereby further reducing the moisture content of the finally discharged mud cake.

[0008] Optionally, a conical spiral shaft structure is provided at the end of the spiral shaft. From the feed port to the discharge port, the conical spiral shaft structure is as follows: the diameter of the central axis gradually increases to form a conical structure, while the shaft diameter of the spiral blades provided on the conical structure gradually decreases. At this time, the back pressure plate is a circular structure.

[0009] By adopting the above technical scheme, the spiral shaft can gradually improve its dehydration effect on the sludge during the process of transporting the sludge and squeezing the sludge for dehydration, thereby reducing the water content of the sludge finally discharged; at the same time, it can effectively improve the coverage of the spiral shaft in the filter chamber for squeezing and dehydrating the sludge, thereby effectively reducing the water content of the sludge finally discharged, and at the same time can effectively reduce the probability of sludge accumulation and clogging at the end of the spiral shaft, reducing the dead corners of sludge clogging in the filter chamber.

[0010] Optionally, the mud pressing structure includes a reverse spiral blade, which is arranged at the end of the screw shaft above the discharge port, and the reverse spiral blade drives the sludge to move in a direction opposite to the direction in which the corresponding spiral blade of the screw shaft drives the sludge to move, so that the reverse spiral blade and the corresponding spiral blade of the screw shaft form a combined force to gather the sludge.

[0011] By adopting the above technical solution, the mud pressing structure can further squeeze and dehydrate the sludge located at the top of the filter chamber to be discharged, thereby further improving the dehydration effect of the sludge located at the top of the filter chamber, and further effectively reducing the moisture content of the discharged sludge.

[0012] Optionally, the mud pressing structure includes a suspended spiral shaft, the spiral shaft at the bottom is longer than the other spiral shafts, the ends of the other spiral shafts have a supporting structure in the filter cavity, a space for the sludge to pass through is reserved on the supporting structure, and the suspended spiral shaft is located above the end of the spiral shaft at the bottom; The suspended spiral shaft is arranged vertically, and the driving device is used to drive the suspended spiral shaft to rotate.

[0013] By adopting the above technical solution, the mud pressing structure can not only further squeeze the sludge, but also drive the sludge near the discharge port at the top of the filter chamber to move towards the discharge port, thereby facilitating the discharge of the sludge and further reducing the moisture content of the mud cake finally discharged.

[0014] Optionally, the mud pressing structure includes two or more of the suspended spiral shafts, and the spiral sheets on adjacent suspended spiral shafts are staggered and interlocked with each other.

[0015] By adopting the above technical solution, the squeezing and guiding effect of the mud pressing structure on the sludge at the top of the filter chamber can be effectively guaranteed, and the probability of sludge accumulation on the suspended spiral shaft can be effectively reduced.

[0016] Optionally, it further comprises one or more filter modules, which are arranged in the filter cavity and distributed along the direction from the feed inlet to the discharge outlet, and the machine body comprises two or more support plates for mounting the filter modules; The filter module comprises two or more groups of movable components; each group of movable components comprises a movable ring and a series connection column, and the series connection column connects all the movable rings in the same group in series; the movable ring is provided with a through hole for sludge to pass through, and the spiral shaft passes through the through hole; the movable rings in each group of movable components are arranged alternately with the movable rings in the adjacent group of movable components, and a filter gap is provided between two movable rings in adjacent and different movable components, and the filter gap is communicated with the through hole, and the through holes of each section of the filter module are communicated; The driving device is used to drive each group of the movable components to move relative to the body, and each group of the movable components in the same section of the filtering module performs cyclic circular motion with staggered motion trajectories; The outer peripheral edge of the movable ring extends smoothly, and a connection ear for connecting with the connection column protrudes from its outer surface. The outer periphery of the connection ear is designed with a guide portion, which is used to guide impurities to leave the movable ring along the circular motion direction of the movable ring.

[0017] By adopting the above technical solution, during the movement process, the movable ring can effectively drive and throw away the sludge and other impurities attached to the periphery in a circular direction by virtue of its smooth outer peripheral surface and the guidance of the guide part, ensuring that impurities are not easily accumulated on the periphery of the movable ring, thereby realizing the self-cleaning function. This feature makes it unnecessary to install an additional spray device, thereby improving the maintenance convenience of the equipment.

[0018] Optionally, the driving device drives two or more of the screw shafts to rotate in the same direction; during the process of the screw shafts transporting the sludge to the discharge port, the rotation direction of the screw shafts is the same as the direction of the circular motion of the movable component.

[0019] By adopting the above technical solution, the dehydrator can have a higher dehydration efficiency, and by making the rotation direction of the spiral shaft and the circular motion of the movable component in the same direction, the distance between the inner circumference of the movable ring and the spiral shaft can be continuously changed to squeeze the sludge. At the same time, the movable ring can assist the sludge to move in the filter chamber toward the discharge port.

[0020] Optionally, the driving device includes two or more driving rods and linkage components corresponding to the movable components one by one; The driving rod is rotatably connected to the machine body, the rotation axis of the driving rod is parallel to the rotation axis of the screw shaft, and two or more driving rods rotate synchronously and in the same direction; Each group of the linkage components includes two or more linkage plates, which are connected to the corresponding movable components. At the same time, the linkage plates are connected to two or more driving rods through an eccentric structure, so that when the driving rods rotate, the linkage plates are driven to perform circular motion; In the same linkage assembly, the eccentric direction and eccentric distance of the eccentric structure relative to the driving rod are consistent; In the same filter module, the eccentric structures of different linkage assemblies have different eccentric directions relative to the driving rod.

[0021] By adopting the above technical solution, the linkage plate is connected to the driving rod by an eccentric structure, so that the movable component moves along a circular path. In the same filter module, the eccentric directions of different linkage components are set to be different from each other. This design promotes relative movement between the movable components, enhances the filtering efficiency, and can significantly improve the dewatering efficiency of the sludge.

[0022] Optionally, the eccentricity of the eccentric structure corresponding to each filter module is different from the eccentricity of the eccentric structure corresponding to other filter modules.

[0023] By adopting the above technical solution, by dividing the filter module into multiple independent parts, the eccentric structure in each filter module can be configured with different eccentric distances. This design enables the equipment to flexibly adapt to diverse dehydration needs, thereby enhancing its adaptability and application range.

[0024] Optionally, along the direction from the feed port to the discharge port, the eccentricity of the filter module in each section corresponding to the eccentric structure gradually decreases.

[0025] By adopting the above technical solution, the movement path of the movable component is designed to gradually converge towards the discharge direction, which can not only enhance the dehydration efficiency in the early stage, but also moderately weaken the filterability in the later stage, thereby effectively reducing the mud leakage phenomenon in the process of gradually increasing extrusion pressure, thereby ensuring the stability and efficiency of the dehydration process.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. The sludge pressing mechanism can make the sludge more concentrated when it is near the discharge port in the filter chamber, and can effectively improve the dehydration effect of the sludge, and can make the sludge discharged after dehydration more concentrated; 2. The sludge pressing mechanism can effectively improve the dehydration effect of the sludge in the filter chamber, thereby effectively reducing the moisture content of the sludge finally discharged; 3. The dehydration effect of the sludge in the filter chamber tends to be equal, which can make the sludge dehydrated more evenly under pressure in the filter chamber, thereby further reducing the moisture content of the discharged sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a structural schematic diagram of a laminated spiral dehydrator in Example 1; Figure 2 It is a partial structural schematic diagram of a laminated spiral dehydrator in Example 1; Figure 3 It is a schematic diagram of the structure of the movable ring a and the movable ring b in Example 1; Figure 4 It is a schematic diagram of the structure of the movable ring c and the movable ring d in Example 1; Figure 5 is a schematic diagram of the structure of two interlocking plates in Example 1; Figure 6 is a schematic diagram of the structure of the other two linkage plates in Example 1; Figure 7 is a structural schematic diagram of a laminated spiral dehydrator in Example 2; Figure 8 It is a partial structural schematic diagram of a laminated spiral dehydrator in Example 2; Fig. 9is a structural schematic diagram of a laminated spiral dehydrator in Example 3; Fig.10 It is a schematic diagram of the partial structure of a laminated spiral dehydrator in Example 3.

[0028] Explanation of the reference numerals: 1. Machine body; 11. Filter chamber; 12. Feed inlet; 13. Discharge outlet; 14. Back pressure plate; 2. Screw shaft; 31. Drive rod; 32. Gear transmission mechanism; 33. Linking assembly; 331. Linking plate; 332. Give way hole; 34. Eccentric structure; 4. Mud pressing structure; 41. Reverse spiral blades; 42. Suspended screw shaft; 5. Movable assembly; 51. Movable ring; 511. Through hole; 512. Serial ear; 513. Guide-off portion; 514. Perforation; 52. Serial column. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-6 This application is described in further detail.

[0030] The embodiment of the present application discloses a laminated spiral dewatering machine for dewatering sludge.

[0031] Embodiment 1: Reference Figure 1 and Figure 2 The laminated spiral dewatering machine includes a machine body 1, two or more spiral shafts 2, a first driving device, a filtering module and a mud pressing structure 4. The machine body 1 can provide a place for the filtrate to separate the solid and liquid to obtain the dehydrated sludge; the spiral shaft 2 is used to drive the sludge to move in a specified direction and apply pressure to the sludge to dehydrate it; the first driving device provides power for sludge dehydration; the filtering module provides the filtrate to achieve solid-liquid separation; and the mud pressing structure 4 is used to enhance the dehydration effect of the sludge located at the top of the machine body 1, so that the dehydration effect of the sludge finally discharged is more uniform.

[0032] The body 1 has a filter chamber 11 for dehydrating sludge. Both ends of the body 1 in the length direction are provided with a feed inlet 12 for filtrate to enter the filter chamber 11 and a discharge port 13 for sludge to be discharged.

[0033] Two or more spiral shafts 2, the first drive device and the filter module are all mounted, supported and positioned on the body 1 through multiple support plates, and adjacent support plates are connected and fixed by fixing columns, so that the multiple support plates are connected into a whole. Specifically, the fixing columns are installed in a direction perpendicular to the surface of the support plates, and a total of four fixing columns are installed between two adjacent support plates. The four fixing columns are respectively connected to the four corners of the support plates, and the two ends of the fixing columns that are far away from each other slide through the two adjacent support plates and are covered with gaskets and then locked with nuts to position the two adjacent support plates.

[0034] The filter module has one or more sections, and the filter modules are distributed along the length direction of the body 1. The filter module includes two or more groups of movable components 5, and the movable components 5 include movable rings 51 and serial connection columns 52. A plurality of movable rings 51 are evenly spaced and arranged along the length direction of the body 1. The serial connection columns 52 simultaneously connect all movable rings 51 in the same movable component 5, so that all movable rings 51 in the same group form a whole.

[0035] Specifically, a serial ear 512 protrudes outward from the outer circumference of the movable ring 51, and a through hole 514 is opened on the serial ear 512 for the serial column 52 to pass through. The serial column 52 passes through all the movable rings 51 in the same movable component 5 along the distribution direction of the movable ring 51 through the through hole 514, and both ends of the serial column 52 are installed and supported on the body 1 through a support plate.

[0036] One or more serial connection ears 512 are provided on the movable ring 51 . In the present embodiment, preferably, two serial connection ears 512 are provided on each movable ring 51 . Accordingly, preferably, each set of movable components 5 includes two serial connection posts 52 .

[0037] In addition, in order to avoid mutual position interference between the serial connection columns 52 on the movable rings 51 in different movable components 5, the serial connection ears 512 of the movable rings 51 of different movable components 5 in the same section filtering module are staggered with each other, so that the serial connection columns 52 in different movable components 5 are staggered with each other.

[0038] The inner periphery of the movable ring 51 forms a through hole 511, and a corresponding opening connected to the through hole 511 is opened on the support plate for sludge to pass through. The through holes 511 on the movable ring 51 in each section of the filter module are connected in sequence to form a filter chamber 11 for sludge to pass through to complete solid-liquid separation.

[0039] There is a filter gap between two movable rings 51 of adjacent and different movable components 5, and the filter gap is connected with the through hole 511. When the filtrate passes through the through hole 511, the liquid in the filtrate can flow out through the filter gap under the action of its own gravity.

[0040] The machine body is also equipped with a third driving device, and each group of movable components 5 cooperates with the third driving device. The third driving device can drive each group of movable components 5 to perform cyclic circular motion in a direction perpendicular to the length direction of the machine body 1. The circular motion trajectories of different groups of movable components 5 in the same filter module are staggered, so that the two adjacent and different groups of movable rings 51 continue to move alternately, thereby maintaining the unobstructed filter seam, and the movable ring 51 can continuously disturb and shear the sludge to improve the water filtering efficiency. In actual applications, the size of the hole on the support plate for the serial column 52 to penetrate is larger than the size of the serial column 52, so that the serial column 52 can move.

[0041] Furthermore, it is preferred that the outer periphery of the movable ring 51 is in a smoothly extended elliptical shape, the serial ear 512 protrudes from the outer periphery of the movable ring 51 and has a guide portion 513. The guide portion 513 can guide the sludge and other impurities on the outer peripheral wall of the movable ring 51 downward away from the movable ring 51 along the circular motion direction of the movable ring 51 during the movement of the movable ring 51. At the same time, the sludge on the movable ring 51 can also slide off the movable ring 51 under the action of its own gravity, so as to realize self-cleaning of the movable ring 51 and prevent siltation from accumulating on the outer periphery of the movable ring 51.

[0042] Reference Figure 3 and Figure 4 Furthermore, it is preferred that the shapes of the movable rings 51 in different movable components 5 are different, that is, the positions and shapes of the serial ears 512 on the movable rings 51 are different. In this embodiment, the movable rings 51 can be divided into movable rings a, movable rings b, movable rings c and movable rings d according to their different shapes.

[0043] Take the example that the circular motion direction of movable rings a, b, c, and d is clockwise. The two serial ears 512 on movable ring a are respectively located on the left and right opposite sides of movable ring 51, and the two serial ears 512 are respectively close to the upper left corner and the lower right corner of movable ring a. The guide portion 513 is the upper side of the serial ears 512, which tends to gradually tilt downward away from the movable ring a. The two serial ears 512 on movable ring b are respectively located on the upper and lower opposite sides of movable ring b, and the two serial ears 512 are respectively close to the upper right corner and the lower left corner of movable ring b. At the same time, the two serial ears 512 are respectively connected to the arc surfaces on the opposite sides of movable ring b. The guide portion 513 is the upper side of the serial ears 512, which tends to gradually extend to both sides. The two serial ears 512 on the movable ring c are respectively located at the left and right opposite sides of the movable ring c, and the two serial ears 512 are respectively close to the lower left corner and the upper right corner of the movable ring c. The guide portion 513 is the upper side surface of the serial ear 512, which has a tendency to gradually tilt downward away from the movable ring c. The two serial ears 512 on the movable ring d are respectively located at the upper left corner and the lower right corner of the movable ring d. The guide portion 513 is the right side surface of the serial ear 512, which has a tendency to gradually tilt rightward along the downward direction.

[0044] Reference Figure 1 and Figure 5 The third driving device includes two or more driving rods 31, a gear transmission mechanism 32 and a linkage assembly 33 corresponding to the movable assembly 5 one by one.

[0045] The driving rods 31 are round rod-shaped, all driving rods 31 are parallel to each other and pass through all the support plates along the length direction of the body 1, and the driving rods 31 are rotatably connected to the support plates through bearings. In this embodiment, the number of driving rods 31 is preferably two, and in other embodiments, it can be three, four, etc.

[0046] The gear transmission mechanism 32 is located on one side of the machine body 1 close to the feed port 12. The ends of the two driving rods 31 are connected to the gear transmission mechanism 32 to form a match, and the gear transmission mechanism 32 can make the two driving rods 31 rotate synchronously and in the same direction; the third driving device can drive one of the driving rods 31 to rotate, and the two driving rods 31 can be rotated synchronously and in the same direction through the gear transmission mechanism 32. In this embodiment, since the gear transmission mechanism 32 with the above functions is a common prior art, it will not be described here in detail, and it is only briefly shown in the drawings.

[0047] Reference Figure 2 and Figure 5 The linkage assembly 33 includes two or more linkage pieces 331, each set of linkage pieces 331 is sleeved on two serial connection posts 52 in the corresponding movable assembly 5, and the linkage piece 331 abuts between two adjacent movable rings 51 of the corresponding movable assembly 5, and the linkage piece 331 has a hollow area opposite to and connected to the through hole 511. At this time, the movement of the linkage piece 331 can drive the corresponding movable assembly 5 to move together. In this embodiment, the linkage assembly 33 preferably includes two linkage pieces 331 in total.

[0048] Reference Figure 5 and Figure 6 Correspondingly, in order to adapt to the movable ring a, the movable ring b, the movable ring c and the movable ring d, the linkage assembly 33 includes four types of linkage pieces 331 in total.

[0049] Reference Figure 2 and Figure 5 The linking piece 331 is connected to the two driving rods 31 through the eccentric structure 34, and the eccentric direction and eccentric distance of the eccentric structure 34 of the same group of linking components 33 relative to the driving rod 31 are consistent, so that when the two driving rods 31 rotate synchronously, the linking piece 331 is driven to move in a circular trajectory, and then the linking piece 331 drives the movable component 5 to move in a circular trajectory. A clearance hole 332 is opened on the linking piece 331, and the serial connection column 52 of the same filter module but different movable components 5 passes through the linking piece 331 through the clearance hole 332. The size of the clearance hole 332 is larger than the size of the serial connection column 52, so as to make way for the movement of the serial connection column 52. The eccentric structures 34 corresponding to the same filter module but in different linkage components 33 have different eccentric directions relative to the driving rod 31 (not shown in the figure), so that the circular trajectory motions of the two groups of movable components 5 in the same filter module are mutually dislocated. In this embodiment, the eccentric structure 34 is preferably an eccentric bearing, the eccentric bearing is fixedly eccentrically sleeved on the driving rod 31, and the linkage piece 331 is rotatably sleeved on the eccentric bearing; since the eccentric structure 34 with the above-mentioned function is a common prior art, it will not be described here in detail, and it is only briefly shown in the drawings.

[0050] Furthermore, the eccentricity of the eccentric structure 34 corresponding to each filter module can be different from the eccentricity of the eccentric structure 34 corresponding to the other filter modules (not shown in the figure). In this embodiment, the eccentricity of the eccentric structure 34 corresponding to each filter module decreases in the direction close to the discharge port 13, so that the disturbance amplitude of the movable ring 51 in the filter module close to the discharge port 13 is greater than the disturbance amplitude of the movable ring 51 in the filter module far from the discharge port 13, so that the filter seam in the filter module close to the discharge port 13 has better permeability, which helps to improve the water filtering efficiency; in other embodiments, the change of the eccentricity can also be small first and then large, or large first, small and then large.

[0051] Reference Figure 1 and Figure 2 , two or more screw shafts 2 are rotatably installed inside the body 1, the screw shaft 2 at the bottom is coaxial with the discharge port 13 and passes through the discharge port 13, and a back pressure plate 14 is fixedly installed on the side of the discharge port 13 away from the filter chamber 11 of the body 1; when the sludge is discharged from the discharge port 13, the back pressure plate 14 is used to block but not block the discharge port 13, thereby increasing the squeezing effect of the sludge, and allowing the sludge to be discharged from the gap between the discharge port 13 and the back pressure plate 14, so as to facilitate the discharge and collection of the sludge after compaction to form a mud cake. In this embodiment, the radial dimension of the discharge port 13 is preferably equal to the radial dimension of the spiral sheet of the corresponding screw shaft 2, and the radial dimension of the back pressure plate 14 is preferably greater than the radial dimension of the discharge port 13.

[0052] Furthermore, in order to reduce the probability of sludge in the filter chamber 11 flowing back through the feed port 12, the end of the spiral shaft 2 located at the top close to the feed port 12 preferably has a structure for blocking the space between the adjacent spiral sheets of the corresponding spiral sheet. In this embodiment, since the structure with the above-mentioned function is the prior art in the art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0053] Furthermore, in order to improve the dehydration effect of the sludge in the filter chamber 11, it is preferred that the end of the central axis of the screw shaft 2 close to the discharge port 13 gradually becomes thicker along the axial direction of the screw shaft 2 from the feed port 12 to the discharge port 13, forming an inverted cone structure.

[0054] At this time, the path of the sludge moving in the filter chamber 11 toward the discharge port 13 is gradually reduced, so that the pressure effect of the sludge is gradually increased, thereby effectively improving the dehydration effect of the sludge in the filter chamber 11.

[0055] Furthermore, in order to further improve the squeezing and dehydrating effect of the spiral shaft 2 on the sludge and reduce the accumulation of sludge on the surface of the central axis of the spiral shaft 2, it is preferred that the axial diameter of the spiral blades of the spiral shaft 2 on the inverted cone structure of the central axis gradually decreases from the feed port 12 to the discharge port 13 along the axial direction of the corresponding spiral shaft 2, forming a conical structure.

[0056] At this time, the conical structure of the spiral blade of the spiral shaft 2 can disturb the sludge accumulated on the surface of the central axis of the adjacent spiral shaft 2 during the rotation of the spiral shaft 2 .

[0057] The mud pressing structure 4 is installed on the machine body 1 and is located at the top of the filter chamber 11 near the discharge port 13. It can enhance the dehydration effect of the sludge at this position in the filter chamber 11, so that the sludge at the top of the filter chamber 11 has a lower moisture content when discharged through the discharge port 13, and can also facilitate the discharge of the sludge through the discharge port 13 after dehydration.

[0058] The mud pressing structure 4 includes one or more reverse spiral blades 41, and the one or more reverse spiral blades 41 correspond one to one with one or more spiral shafts 2 located above the discharge port 13. In this embodiment, it is preferred that the laminated spiral dehydrator includes two spiral shafts 2, and it is preferred that the mud pressing structure 4 includes one reverse spiral blade 41, and the reverse spiral blade 41 corresponds to the spiral shaft 2 located at the top; in other embodiments, when the laminated spiral dehydrator includes more than two spiral shafts 2, the mud pressing structure 4 may include more than one reverse spiral blade 41.

[0059] The reverse spiral blade 41 is coaxially arranged with the corresponding spiral shaft 2 and is located at the end of the corresponding spiral shaft 2 away from the feed port 12; the first driving device can drive the spiral shaft 2 and the reverse spiral blade 41 to rotate relative to the body 1 in the filter chamber 11. At this time, the direction in which the reverse spiral blade 41 rotates to drive the sludge to move is opposite to the direction in which the spiral blade of the corresponding spiral shaft 2 rotates to drive the sludge to move. After the sludge is collected, it will fall to the bottom of the filter chamber 11 near the discharge port 13 under the action of its own gravity, and then be discharged through the discharge port 13. In this embodiment, it is preferred that the reverse spiral blade 41 and the spiral shaft 2 are integrally formed. At this time, the length dimension of the shaft body (the integral structure of the reverse spiral blade 41 and the spiral shaft 2) at the top will be greater than the length dimension of the spiral shaft 2 at the bottom, and the spiral blade of the spiral shaft 2 is arranged in the opposite direction to the reverse spiral blade 41. At this time, the first driving device only needs to directly drive the spiral shaft 2 to rotate to drive the mud pressing structure 4 to further dehydrate the sludge.

[0060] The implementation principle of a laminated spiral dehydrator in the embodiment of the present application is: After the filtrate enters the filter chamber 11 through the feed port 12, the two spiral shafts 2 are driven by the first driving device to rotate and drive the sludge to move toward the discharge port 13. The sludge is dehydrated under pressure during the movement, and the filtrate is filtered by the filter module to achieve solid-liquid separation in the filter chamber 11. When the sludge at the top of the filter chamber 11 moves to above the discharge port 13, the sludge will be simultaneously subjected to the pressure applied by the spiral shaft 2 and the mud pressing structure 4 at the top, so that it is further squeezed and dehydrated. The sludge then moves downward under the action of its own gravity, and is discharged through the discharge port 13 together with the sludge that has been dehydrated at the bottom of the filter chamber 11 under further squeezing of the back pressure plate 14, so that the sludge at the top of the filter chamber 11 can be discharged through the discharge port 13 in a state with a better dehydration effect, and at the same time, it can facilitate the discharge of the sludge through the discharge port 13, thereby effectively reducing the moisture content of the sludge after discharge.

[0061] Embodiment 2: Reference Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 lies in the mud pressing structure 4, and the structures of the two spiral shafts 2 are different.

[0062] The length of the screw shaft 2 at the top is smaller than that of the screw shaft 2 at the bottom. A space for installing the mud pressing structure 4 is left in the filter chamber 11 on the side of the screw shaft 2 at the top away from the feed port 12, and the end of the screw shaft 2 at the bottom away from the feed port 12 extends a certain length below the mud pressing structure 4. In this embodiment, the end of the screw shaft 2 at the top is preferably also supported by a frame installed inside the body 1, and a through hole is left on the frame for the sludge to pass through; since the frame structure with the above functions is a common prior art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0063] The mud pressing structure 4 includes a suspended spiral shaft 42 and a second driving device. The suspended spiral shaft 42 is rotatably connected to the frame structure at one end of the machine body 1 near the discharge port 13, and its rotation axis coincides with its own axis and is parallel to the distribution direction of the two spiral shafts 2; the second driving device is fixedly installed on the top of the frame structure at one end of the machine body 1 near the discharge port 13, and a connection is formed between one end of the top of the suspended spiral shaft 42 and the second driving device, and the second driving device drives it to rotate relative to the machine body 1; during the rotation of the suspended spiral shaft 42, its spiral blades can drive the sludge located at one end of the top of the filter chamber 11 near the discharge port 13 to move toward the direction close to the discharge port 13, and can further squeeze and dehydrate the sludge at this location. In this embodiment, it is preferred that the radial dimension of the suspended spiral shaft 42 is equal to the radial dimension of the central axis of the spiral shaft 2.

[0064] The implementation principle of a laminated spiral dehydrator in the embodiment of the present application is: After the filtrate enters the filter chamber 11 through the feed port 12, the two spiral shafts 2 are driven by the first driving device to rotate and drive the sludge to move toward the discharge port 13. The sludge is dehydrated under pressure during the movement, and the filtrate is filtered by the filter module to achieve solid-liquid separation in the filter chamber 11. When the sludge at the top of the filter chamber 11 moves to the position of the mud pressing structure 4, the sludge will be subjected to the pressure applied by the spiral shaft 2 and the mud pressing structure 4 at the top at the same time, so that it is further squeezed and dehydrated. The sludge then moves toward the direction close to the discharge port 13 under the action of its own gravity and the guiding action of the mud pressing structure 4, and is discharged through the discharge port 13 together with the sludge dehydrated at the bottom of the filter chamber 11 under further squeezing of the back pressure plate 14, so that the sludge at the top of the filter chamber 11 can be discharged through the discharge port 13 in a state with a better dehydration effect, and at the same time, it can facilitate the discharge of the sludge through the discharge port 13, thereby effectively reducing the moisture content of the sludge after discharge.

[0065] Embodiment 3: Reference Fig. 9 and Fig.10 The difference between this embodiment and embodiment 2 lies in the mud pressing structure 4.

[0066] The mud pressing structure 4 includes a plurality of suspended spiral shafts 42, which are spatially distributed on the side of the spiral shaft 2 at the top away from the feed port 12 and are parallel to each other, and the spiral blades of adjacent suspended spiral shafts 42 are staggered and interlocked with each other. At this time, during the rotation of the suspended spiral shaft 42, the spiral blades can disturb the sludge attached to the surface of the central axis of the adjacent suspended spiral shaft 42, thereby reducing the sludge adhesion and accumulation on the surface of the central axis of the suspended spiral shaft 42. In this embodiment, the mud pressing structure 4 preferably includes two suspended spiral shafts 42, and the two suspended spiral shafts 42 are preferably arranged along the axial direction of the spiral shaft 2; in other embodiments, the mud pressing structure 4 may also include more than two suspended spiral shafts 42.

[0067] The two suspended spiral shafts 42 are driven by the second driving device to rotate relative to the machine body 1. In this embodiment, the second driving device 3 is preferably used to drive the two suspended spiral shafts 42 to rotate synchronously and in the same direction, which can further dehydrate the sludge and also guide the sludge; in other embodiments, the second driving device 3 can also drive the two suspended spiral shafts 42 to rotate in the same direction, which can also further dehydrate the sludge and also guide the sludge.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A laminated spiral dehydrator, comprising a body, two or more spiral shafts and a first driving device, characterized in that: The body has a filter cavity inside, the spiral shaft is arranged in the filter cavity, two or more spiral shafts are distributed up and down, and the spiral sheets of adjacent spiral shafts are staggered and interlocked with each other; The two ends of the machine body are respectively provided with a feed port and a discharge port which are communicated with the filter cavity, the discharge port is located at the bottom of the machine body and corresponds to the end of the spiral shaft located at the bottom, and the machine body is provided with a back pressure plate on the outside of the discharge port, and the sludge is discharged from the gap between the discharge port and the back pressure plate; It also includes a mud pressing structure for further pressurizing the sludge, wherein the mud pressing structure is located at one end of the filter chamber close to the discharge port and above the discharge port; The first driving device is used to drive two or more of the screw shafts to rotate synchronously.

2. A laminated spiral dehydrator according to claim 1, characterized in that: A conical spiral shaft structure is provided at the end of the spiral shaft. From the feed port to the discharge port, the conical spiral shaft structure is as follows: the diameter of the central axis gradually increases to form a conical structure, while the shaft diameter of the spiral blades provided on the conical structure gradually decreases. At this time, the back pressure plate is a circular structure.

3. A laminated spiral dehydrator according to claim 2, characterized in that: The mud pressing structure includes a reverse spiral blade, which is arranged at the end of the spiral shaft above the discharge port. The reverse spiral blade drives the sludge to move in a direction opposite to the direction in which the corresponding spiral blade of the spiral shaft drives the sludge to move, so that the reverse spiral blade and the corresponding spiral blade of the spiral shaft form a combined force to gather the sludge.

4. The laminated spiral dehydrator according to claim 1, characterized in that: The mud pressing structure includes a suspended spiral shaft and a second driving device, the spiral shaft located at the bottom is longer than the other spiral shafts, the ends of the other spiral shafts have a supporting structure in the filter cavity, the supporting structure has a space for the sludge to pass through, and the suspended spiral shaft is located above the end of the spiral shaft at the bottom; The suspended spiral shaft is arranged vertically, and the second driving device is used for driving the suspended spiral shaft to rotate.

5. The laminated spiral dehydrator according to claim 4, characterized in that: The mud pressing structure comprises two or more suspended spiral shafts, and the spiral sheets on adjacent suspended spiral shafts are staggered and interlocked with each other.

6. The laminated spiral dehydrator according to claim 1, characterized in that: It also includes one or more filter modules and a third driving device, which are arranged in the filter cavity and distributed along the direction from the feed inlet to the discharge outlet, and the machine body includes two or more support plates for installing the filter modules; The filter module comprises two or more groups of movable components; each group of movable components comprises a movable ring and a series connection column, and the series connection column connects all the movable rings in the same group in series; the movable ring is provided with a through hole for sludge to pass through, and the spiral shaft passes through the through hole; the movable rings in each group of movable components are arranged alternately with the movable rings in the adjacent group of movable components, and there is a filter gap between two movable rings in adjacent and different movable components, and the filter gap is communicated with the through hole, and the through holes of each section of the filter module are communicated, and the support plate also has a through hole for sludge to pass through; The third driving device is used to drive each group of the movable components to move relative to the body, and each group of the movable components in the same section of the filtering module to perform cyclic circular motion with staggered motion trajectories; The outer peripheral edge of the movable ring extends smoothly, and a connection ear for connecting with the connection column protrudes from its outer surface. The outer periphery of the connection ear is designed with a guide portion, which is used to guide impurities to leave the movable ring along the circular motion direction of the movable ring.

7. The laminated spiral dehydrator according to claim 6, characterized in that: The first driving device drives two or more of the screw shafts to rotate in the same direction; during the process of the screw shafts conveying the sludge to the discharge port, the rotation direction of the screw shafts is the same as the direction of the circular motion of the movable component.

8. The laminated spiral dehydrator according to claim 6, characterized in that: The third driving device includes two or more driving rods and linkage components corresponding to the movable components one by one; The driving rod is rotatably connected to the machine body, the rotation axis of the driving rod is parallel to the rotation axis of the screw shaft, and two or more driving rods rotate synchronously and in the same direction; Each group of the linkage components includes two or more linkage plates, which are connected to the corresponding movable components. At the same time, the linkage plates are connected to two or more driving rods through an eccentric structure, so that when the driving rods rotate, the linkage plates are driven to perform circular motion; In the same linkage assembly, the eccentric direction and eccentric distance of the eccentric structure relative to the driving rod are consistent; In the same filter module, the eccentric structures of different linkage assemblies have different eccentric directions relative to the driving rod.

9. The laminated spiral dehydrator according to claim 8, characterized in that: The eccentricity of the eccentric structure corresponding to each filter module is different from the eccentricity of the eccentric structure corresponding to other filter modules.

10. The laminated spiral dehydrator according to claim 9, characterized in that: Along the direction from the feed inlet to the discharge outlet, the eccentricity of the filter modules in each section corresponding to the eccentric structure gradually decreases.

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