Water-containing material laying device

Abstract

A sludge laying device comprises a sludge laying assembly; wherein the mud paving assembly comprises a first assembly and a second assembly which are respectively provided with a channel, the second end of the second assembly is provided with a discharge port, and the second end of the first assembly is connected with the first end of the second assembly, so that the channel of the first assembly is communicated with the channel of the second assembly; the channel of the second assembly has the same cross section in the direction perpendicular to the sludge advancing direction; the bottom surface of the second assembly for bearing the sludge is a plane; the sectional area of the first assembly channel at the second end is smaller than that at the first end, and the cross section of the second assembly channel is the same as that of the first assembly channel at the second end. According to the device, water-containing materials (such as sludge) can be more uniformly laid on the filter cloth.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid-liquid separation, and in particular, relates to equipment for solid-liquid separation of sludge, and more particularly, to a device for laying sludge in a sludge treatment system. Background Art

[0002] As the amount of urban sewage continues to grow, the number of corresponding sewage treatment facilities has also increased, and the amount of residual sludge, a byproduct of sewage treatment, has also increased. How to properly handle and dispose of this ever-increasing amount of sludge has become an urgent problem to be solved in my country's environmental protection.

[0003] The residual sludge is separated into solid and liquid, and the separated liquid and solid are further purified by corresponding methods. There are many methods for solid-liquid separation, including pressing, extrusion, centrifugation, etc., and the corresponding solid-liquid separation equipment is also diverse. The most widely used equipment at present is the belt dehydrator. When using the belt dehydrator, the material is between two layers of filter belts and pressure is applied by the pressure roller. The advantage is that the filter belt is a soft material and will not form a fixed volume of the containing cavity. The compression limit of the material is large, but there are problems such as short extrusion time and low extrusion pressure.

[0004] Filter pressing is also a conventional method for dehydrating high-water-content materials (such as excess sludge). Filter cloth is used to carry the water-containing material for dehydration, and the filter cloth is folded and sprayed with materials, and then squeezed for a long time, so that all filter cloths and the water-containing materials on the filter cloth can obtain a longer squeezing time and a greater squeezing pressure. For example, the applicant's patent applications CN202210362474.5 and CN202210363857.4, etc., all involve laying multiple layers of water-containing materials (sludge) on the filter cloth, and separating the solid and liquid of the sludge by squeezing.

[0005] The laying of sludge on the filter cloth is one of the important links of the method, and the thickness of each layer of sludge should be as thick as possible. For example, Chinese patent application publication No. CN114748900A discloses a device for laying materials, and the repeated movement of the push plate of the folding coating device evenly spreads the material between the two layers of filter cloth. Summary of the invention

[0006] On the one hand, the present application provides a device for spreading sludge, which can spread water-containing materials (such as sludge) on a filter cloth more evenly.

[0007] On the other hand, the sludge laying device of the present application can not only lay the filter cloth, but also evenly lay the sludge on the filter cloth, thereby shortening the time for laying multiple layers of sludge.

[0008] On the other hand, the sludge laying method of the present application can evenly lay the sludge on the filter cloth in a relatively short time, thereby improving the sludge laying efficiency.

[0009] The present application discloses a device for laying sludge, comprising: a sludge laying component; wherein the sludge laying component comprises a first component and a second component respectively having channels, the second end of the second component is provided with a discharge port, the second end of the first component is connected to the first end of the second component, so that the first component channel is connected to the second component channel; the channels of the second component are the same in cross-section perpendicular to the bottom surface thereof, and the bottom surface of the second component carrying the sludge is a plane; the cross-sectional area of ​​the first component channel at the second end is smaller than the cross-sectional area at the first end, and the cross-sectional area of ​​the second component channel is the same as the cross-sectional area of ​​the first component channel at the second end;

[0010] Among them, in the horizontal direction perpendicular to the sludge flow direction, the width of the second end of the first component channel is greater than the width of the first end; in the vertical direction perpendicular to the sludge flow direction, the height of the second end of the first component channel is less than the height of the first end.

[0011] By using the mud spreading component of the present application, the sludge can flow out from the discharge port of the first component evenly and be spread on the filter cloth, without the need for an additional component to scrape the sludge on the filter cloth.

[0012] On the other hand, a device for laying sludge is provided, wherein a plurality of groups of sludge laying components are distributed in parallel in a shell.

[0013] According to the scale of sludge treatment and in combination with conditions such as filter cloth width, the number of sludge spreading components provided in the sludge spreading device can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the mud laying assembly;

[0015] Figure 2 It is a top view schematic diagram of the mud laying assembly;

[0016] Figure 3 It is a schematic diagram of a prior art mud laying assembly;

[0017] Figure 4 It is a schematic diagram of the structure of the device for laying sludge;

[0018] Figure 5 is a schematic cross-sectional view of a device for laying sludge;

[0019] Figure 6 It is a partial enlarged view of the device for laying sludge. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the sludge laying device of the present invention, which does not limit the scope of protection of the present application, and its scope of protection is defined by the claims. Certain specific details disclosed provide a comprehensive understanding of each disclosed embodiment. However, those skilled in the relevant art know that the embodiment can be implemented without using one or more of these specific details and using other materials, etc.

[0021] Unless the context requires otherwise, in the specification and claims, the terms "include" and "comprising" should be construed as having an open-ended, inclusive meaning, that is, "including, but not limited to".

[0022] The "embodiment", "one embodiment", "another embodiment" or "certain embodiments" mentioned in the specification means that the specific features, structures or characteristics described in connection with the embodiment are included in at least one embodiment. Therefore, "embodiment", "one embodiment", "another embodiment" or "certain embodiments" do not necessarily all refer to the same embodiment. And the specific features, structures or characteristics can be combined in any way in one or more embodiments. Each feature disclosed in the specification can be replaced by any alternative feature that can provide the same, equal or similar purpose. Therefore, unless otherwise specified, the disclosed features are only general examples of equal or similar features.

[0023] The existing mud spreading components have the problem of uneven sludge discharge. The thickness of the sludge spread on the filter cloth is uneven. Some parts of the filter cloth have thick sludge, while some parts have almost no sludge or the sludge thickness is relatively thin. Therefore, an additional component is required to scrape the sludge on the filter cloth flat; or the uneven multi-layer sludge is directly squeezed, resulting in poor solid-liquid separation effect.

[0024] The present application discloses a device for laying sludge, comprising: a mud laying component; wherein the mud laying component comprises a first component and a second component respectively having channels, the second end of the second component is provided with a discharge port, the second end of the first component is connected to the first end of the second component, so that the channel of the first component is connected to the channel of the second component; the cross-section of the channel of the second component is the same in a direction perpendicular to the forward direction of the sludge, and the bottom surface of the second component supporting the sludge is a plane; the cross-sectional area of ​​the channel of the first component at the second end is smaller than the cross-sectional area at the first end, and the cross-sectional area of ​​the channel of the second component is the same as the cross-sectional area of ​​the channel of the first component at the second end.

[0025] The first end of the first component is connected to the channel of the third component for conveying sludge. The sludge from the third component enters the second component from the end with a larger cross-sectional area of ​​the first component, and through the change in the cross-sectional area of ​​the channel of the second component, it acts as a pressurizer in the channel of the second component, and the sludge is distributed wider in the horizontal direction perpendicular to the flow of sludge in the second component (i.e., the width of the channel). After flowing into the second component from the end with a smaller cross-sectional area of ​​the first component, the sludge is further distributed horizontally wider in the channel of the second component, and can occupy the entire channel of the second component, and evenly flows out at the discharge port of the second component and is laid on the filter cloth.

[0026] In certain embodiments, in a horizontal direction perpendicular to the sludge flow direction, the width of the second end of the first component channel is greater than the width of the first end.

[0027] In the vertical direction perpendicular to the sludge flow direction, the height of the second end of the first component channel is smaller than the height of the first end.

[0028] Optionally, the width of the channel of the first component gradually increases from the first end to the second end.

[0029] The height of the channel of the first component gradually decreases from the first end to the second end.

[0030] Through the setting of the first component channel structure, the sludge enters the channel through the first section of the first component. During the forward process, the pressure gradually increases, and the sludge occupies the first component and gradually disperses continuously from the center to both sides. The bottom of the first component channel moves from the center to both sides in the width direction.

[0031] Alternatively, the cross section of the first component channel at the first end may be circular, quasi-circular, polygonal, elliptical, etc. Considering the convenience of processing and assembly, a more preferred solution is that the cross section of the channel at the first end of the first component may be circular or quasi-circular.

[0032] The first component channel has a polygonal shape with a straight line in the width direction of the cross section at the second end. Preferably, it can be a polygonal shape with parallel upper and lower sides, such as a parallelogram, a rectangle, etc.

[0033] In certain embodiments, the cross-sectional area of ​​the first component channel at the second end is 0.7-1.0 times the cross-sectional area of ​​the first end.

[0034] In certain embodiments, the ratio of the length of the first module in the sludge flow direction to the width of the first module channel at the second end is 1:0.6 to 1:3.

[0035] The width of the second end of the first component refers to the length of the second component channel in the horizontal direction perpendicular to the sludge flow direction.

[0036] The length of the first component refers to the length between the first end and the second end.

[0037] In certain embodiments, in the sludge flow direction, the ratio of the length L1 of the first component to the length L2 of the second component is 1:0.5 to 1:8.

[0038] The cross section of the second component channel is a polygon with straight lines in the width direction. Preferably, it can be a polygon with parallel upper and lower sides; more preferably, the structures on both sides between the top and bottom surfaces of the second component channel are symmetrically arranged.

[0039] For example, the cross section of the second component channel may be rectangular, etc. That is, the cross section of the second component channel and the first component channel at the second end have the same shape.

[0040] The sludge discharged from the second end of the first component flows into the second component channel in the direction of the two side walls in the width direction, and the sludge can be continuously dispersed throughout the entire bottom of the second component channel and evenly flows out through the outlet of the second component.

[0041] The second end of the second component is arranged in an arc shape, with the discharge port facing downward.

[0042] The first component and the second component of the present application can be arranged in an integrated manner or in separate portions.

[0043] Through the mud spreading assembly of the present application, the sludge flowing in from the first end of the first assembly can flow out through the discharge port evenly and continuously after passing through the channels of the first and second assemblies, and be evenly and continuously distributed on the filter cloth. On the filter cloth, the thickness of the sludge spread is relatively uniform, or the surface of the sludge is relatively flat, and no additional steps or components are required to flatten the spread sludge. Therefore, a good solid-liquid separation effect can be achieved while saving process or reducing components.

[0044] On the other hand, a device for spreading sludge is provided, wherein the above-mentioned sludge spreading assembly is placed in a cavity inside a shell.

[0045] A material spreading opening is provided on the bottom surface of the cavity in the shell, and the discharge opening at the second end of the second component of the mud spreading component coincides with the material spreading opening in a direction perpendicular to the bottom surface.

[0046] The cross-sectional area of ​​the material spreading opening is greater than or equal to the cross-sectional area of ​​the discharge opening at the second end of the second component. In this arrangement, the sludge can flow downward through the discharge opening of the second component of the material spreading assembly and the material spreading opening of the shell.

[0047] A cloth pushing head extending downwardly is provided at the first end of the shell near the material spreading opening and basically parallel to the second end of the second component. The first end of the cloth pushing head is connected to the first end of the shell. During the cloth pushing process, the second front end of the cloth pushing head opposite to the first end is lower than the material spreading opening.

[0048] Alternatively, the housing and the cloth pushing head are an integrated structure, and the end of the cloth pushing head in the downwardly inclined extending direction is lower than the material spreading opening. The height difference between the second end of the cloth pushing head and the material spreading opening is greater than the thickness of the sludge to be laid.

[0049] Therefore, during the process of laying the filter cloth, the cloth pushing head can push the filter cloth forward, and at the same time, press the filter cloth downward so that there is a certain distance between the filter cloth and the laying opening, leaving space in the vertical direction for laying a certain thickness of sludge, and the sludge laid on the filter cloth will not stick to the mud laying assembly.

[0050] In some embodiments, a cross section of the cloth pushing head perpendicular to the inclined surface gradually decreases from the first end to the second end.

[0051] That is, the second end of the cloth pushing head in contact with the filter cloth has the smallest cross-sectional area and the friction between the cloth pushing head and the filter cloth is small. During the cloth laying process, the second end of the cloth pushing head moves forward against the filter cloth, and the friction between the cloth pushing head and the filter cloth is small, making it easier to lay the filter cloth.

[0052] In some embodiments, the second end of the cloth pushing head is configured to be in an arc shape, which is an arc protruding in a direction that is inclined downward toward the coating head.

[0053] The arc-shaped second end can push the filter cloth smoothly, reducing the force on the filter cloth during the laying process.

[0054] In some embodiments, the cloth pushing head includes:

[0055] A cloth pushing column arranged at the second end of the cloth pushing head; a rear plate at the first end; and two support plates, each support plate extends from the outer peripheral wall of the cloth pushing column to the rear plate at the second end, respectively, connecting the cloth pushing column and the rear plate.

[0056] The cross section of the cloth pushing column is circular or quasi-circular.

[0057] The rear plate is substantially in a quadrilateral shape, and in the vertical direction perpendicular to the sludge flow direction, the length of the rear plate is smaller than the diameter of the cloth pushing column.

[0058] Preferably, the shape of the rear plate is consistent with that of the first end portion of the housing.

[0059] The diameter of the cloth pushing column is smaller than the length of the rear plate in the up-down direction, or the diameter of the cloth pushing column is smaller than the height of the first end of the shell in the up-down direction.

[0060] The end of the support plate is smoothly connected to the outer peripheral wall of the cloth pushing column.

[0061] The cloth pushing head can be arranged separately from the housing, or can be arranged integrally. When the cloth pushing head is arranged integrally with the housing, the rear plate of the cloth pushing head can be replaced by the first end of the housing.

[0062] Optionally, a reinforcing plate is provided between the two supporting plates. The provision of the reinforcing plate can increase the mechanical strength of the cloth pushing head.

[0063] In some embodiments, the cloth pushing head is rotatably matched with the housing, that is, the cloth pushing head is rotatably connected to the first end of the housing.

[0064] The cloth pushing head comprises a first position which can be rotated upward to an upper limit, and a second position which can be rotated downward to a lower limit.

[0065] In the first position, the second end of the cloth pushing head is higher than the uppermost surface layer of the paving sludge. In the second position, the distance between the second end of the cloth pushing head and the paving opening is greater than the thickness of the paving sludge.

[0066] With such an arrangement, when laying sludge, the second end of the cloth pushing head can be against the filter cloth and rotated to the second position under the force of the filter cloth. The second position is lower than the laying opening by a certain distance, that is, there is a certain distance between the laying opening and the filter cloth below the mud laying assembly, so a certain space can be reserved for the pre-flowing sludge. Optionally, the distance between the laying opening and the second end of the cloth pushing head is greater than the thickness of the laid sludge, so the lower surface of the shell will not contact the sludge and be contaminated. In actual use, the thickness of the sludge each time can be calculated according to the initial velocity of the sludge outflow, and according to the thickness of the laid sludge, the cloth pushing head can be designed so that the second position of the second end is controlled when pushing the cloth and laying the material.

[0067] Optionally, when the cloth pushing head rotates to the first position, the height of the axis of the cloth pushing column is lower than the height of the rotation center of the cloth pushing head.

[0068] An elastic member for driving the cloth pushing head to rotate toward the first position is arranged between the cloth pushing head and the first end of the shell.

[0069] In certain embodiments, a plurality of groups of mud laying assemblies are arranged side by side in the housing.

[0070] Specifically, the second components of the plurality of mud-laying components are laid side by side in the shell.

[0071] In an optional solution, the discharge ports of the second components are in the same straight line.

[0072] On the other hand, a method for laying sludge uses the above-mentioned device for laying sludge, wherein the sludge flows into the channel through the first end of the first component and flows onto the filter cloth from the discharge port of the second component.

[0073] The sludge of the present application may include water plant sludge, domestic sewage sludge, industrial sludge, urban water dredging sludge, etc. Sludge usually contains various microorganisms, organic matter and inorganic particles, etc. Sludge not only contains solid matter, but also has a certain viscosity. Therefore, it is relatively difficult to disperse the sludge.

[0074] The inventors have tried many methods. For example, the first component is designed as a single expanded diameter structure, and the second component is set as an equal diameter structure. After the sludge flows into the first component from the small cross-section end, it is easy to concentrate and flow to both sides, or only spray onto the filter cloth from the middle position of the channel, making it difficult to lay the sludge on the filter cloth more evenly.

[0075] In certain embodiments, the sludge of the present application has an adhesion stress of 400-1500 Pa and a water content of 75 wt%-88 wt%.

[0076] Optionally, the relationship between the unit flow rate of sludge and the cross-sectional area of ​​the outlet of the second component is 0.015 to 0.04 L / (s·cm 2 ).

[0077] By controlling the flow rate of sludge and using the mud spreading assembly provided in the present application to discharge the sludge more evenly, the overall thickness of the spread sludge is evenly distributed.

[0078] By using a sludge laying method of the present application, the sludge can be evenly distributed on the filter cloth.

[0079] The sludge laying equipment of the present application is further explained below with reference to the accompanying drawings.

[0080] As attached Figure 1 , 2 As shown, the mud laying component 1 of the equipment for laying mud comprises a first component 1-1 and a second component 1-2. Both the first component 1-1 and the second component 1-2 have channels for the mud to flow.

[0081] The first end 1-11 of the first component 1-1 is connected to the third component 1-3 for conveying sludge, and the second end 1-12 of the first component 1-1 is connected to the second component 1-2. The other end of the second component 1-2 is provided with a discharge port 1-21, and the other end is arranged in an arc shape, and the discharge port is arranged downward. Alternatively, the first component and the second component are an integrated structure, or the first, second, and third components are an integrated structure.

[0082] A specific implementation method is shown in the attached Figure 1 As shown, the cross section of the first component 1-1 channel at the first end 1-11 is circular or quasi-circular, and it is connected to the channel of the third component 1-3. The cross section at the second end 1-12 of the first component 1-1 channel is rectangular. The horizontal direction perpendicular to the sludge flow direction is the width of the channel, and the vertical direction perpendicular to the sludge flow direction is the height of the channel. From the first end 1-11 to the second end 1-12 of the first component 1-1, the width of the first component 1-1 channel gradually increases, and the height of the channel decreases. The cross-sectional area of ​​the second end of the first component 1-1 channel is 0.7-1 times the cross-sectional area of ​​the first end.

[0083] In the sludge flow direction, the ratio of the length of the first component 1-1 to the width of the second end of the first component is 1:0.6-1:3, and the ratio of the length of the first component 1-1 to the second component 1-2 is 1:0.5-1:8.

[0084] As attached Figure 4 As shown, four groups of mud spreading components 1 can be arranged side by side in the housing 11, and the discharge ports 1-21 of the mud spreading components 1 are located on the same straight line. The mud can be evenly distributed on the filter cloth. The third component 1-3 of the mud spreading component 1 passes through the second end of the housing, and the discharge port of the second component 1-2 is close to the first end of the housing.

[0085] The structure of the housing 11 is shown in the attached Figure 4-6 .

[0086] A material spreading opening 1121 is provided at the bottom of the shell 11, near the first end of the shell, and the discharge opening 1-21 of the mud spreading assembly 1 coincides with the material spreading opening 1121 in a direction perpendicular to the bottom of the shell. A cloth pushing head 113 extending downwardly and obliquely is provided at the first end of the shell 11, and the first end of the cloth pushing head 113 is connected to the first end of the shell 11, and during the cloth pushing process, the second end of the cloth pushing head 113 opposite to the first end is lower than the material spreading opening 1121.

[0087] The cloth pushing head 113 may be an integral structure with the shell 11; or, the cloth pushing head 113 and the shell 11 may be separate structures, and the cloth pushing head 113 may be rotatably connected to the first end of the shell 11 via a connecting piece.

[0088] A structure of the cloth pushing head 113 can be referred to in the attached Figure 5-6 The cloth pushing head 113 includes a cloth pushing column 1134, a rear plate and a first supporting plate 1131 and a second supporting plate 1132; one end of the first and second supporting plates are respectively connected to the circular periphery of the cloth pushing column 1134, and the second end is connected to the opposite sides of the rear plate.

[0089] The first and second supporting plates are respectively tangent to the outer peripheral wall of the cloth pushing column 1134 .

[0090] The cross section of the cloth pushing post 1134 is circular or quasi-circular, and the diameter of the cloth pushing post 1134 is smaller than the distance between the two sides where the rear plate is connected to the first and second support plates. The arrangement of the cloth pushing post of this shape increases the force strength of the cloth pushing head. The cloth pushing head 1134 formed in this way gradually decreases in height perpendicular to the support plate from the first end to the second end. The shape of the rear plate is consistent with the shape of the first end of the shell.

[0091] In this embodiment, a reinforcing plate 1133 is provided between the two support plates for reinforcing the structure of the cloth pushing head 113 .

[0092] Preferably, Figure 6 As shown, in some specific embodiments, the extension length of the second support plate 1132 connected to the cloth pushing column 1134 from below the cloth pushing column 1134 is less than the extension length of the first support plate 1131 connected to the cloth pushing column 1134 from above the cloth pushing column 1134. The two ends of the reinforcing plate 1133 are respectively connected to one end of the second support plate 1132 away from the cloth pushing column 1134 and the middle part of the first support plate 1131.

[0093] Of course, the cloth pushing head 113 may also be a solid structure, as long as the cross section from the first end to the second end gradually increases, that is, the cross section of the second end in contact with the filter cloth is the smallest.

[0094] In one embodiment, the cloth pushing head 113 is separately provided from the housing 11 and is rotatably mounted on the first end of the housing 11 .

[0095] During the process of laying the sludge, the cloth-pushing head 113 pushes the filter cloth forward and spreads the filter cloth on a certain plane board. While spreading the cloth, the sludge flows from the spreading opening onto the filter cloth. After the filter cloth is spread from one end of the plane board to the other end, the cloth-pushing head 113 moves backward, and stops the sludge from flowing out of the spreading opening while moving backward. This is repeated, and when the cloth-pushing head 113 falls back to one end of the plane board, it pushes the cloth again and spreads the material, and repeats the above steps. Since the cloth is not being spread when moving backward, it can be quickly retreated, which can shorten the laying time of each layer of sludge.

[0096] During the cloth spreading process, the cloth pushing column 1134 of the cloth pushing head 113 rotates downward to a second position, the second position is lower than the spreading opening, and the distance between the second position and the spreading opening is greater than the thickness of the sludge to be spread.

[0097] After laying the filter cloth, when retreating, the cloth pushing head 113 includes a first position in which it is rotated upward to an upper limit, and the cloth pushing head 113 is in the first position higher than the upper surface of the laid sludge.

[0098] In this embodiment, a structure for driving the cloth pushing head 113 to rotate between the first position and the second position may be provided between the cloth pushing head 113 and the housing 11 .

[0099] In this embodiment, the cloth pushing head 113 can be driven to rotate by a separate small motor. An elastic member, such as a torsion spring, can also be used to drive the cloth pushing head 113 to rotate to the first position.

[0100] In some specific embodiments, the cloth pushing head 113 is installed at the first end of the housing 11 via a rotating shaft, and the axis of the rotating shaft extends in a lateral direction perpendicular to the sludge flow direction. A limiting structure is provided between the cloth pushing head 113 and the housing 11 for limiting the upper limit position of the upward rotation of the cloth pushing head 113 and the upper limit position of the downward rotation.

[0101] The limiting structure can be arranged between the rotating shaft and the sleeve on the cloth pushing head 113. The limiting structure includes a first limiting structure and a second limiting structure, wherein the first limiting structure limits the upper limit position of the cloth pushing head 113 when rotating upward, and limits the cloth pushing head 113 to the first position, and the second limiting structure limits the upper limit position of the cloth pushing head 113 when rotating downward, and limits the cloth pushing head 113 to the second position.

[0102] In some other possible embodiments, the rotation of the cloth pushing head 113 can be limited by the front end surface of the shell 11. Specifically, the rotating shaft can be set between the middle of the first end surface of the shell 11 and the cloth pushing head 113, and there is a gap between the rear plate of the cloth pushing head 113 and the shell 11 for the cloth pushing head 113 to rotate. When the cloth pushing head 113 rotates to the first position, the upper end of the cloth pushing head 113 close to the shell 11 abuts against the front end of the shell 11, and when the cloth pushing head 113 rotates to the second position, the lower end of the cloth pushing head 113 close to the shell 11 abuts against the front end of the shell 11.

[0103] Preferably, in this embodiment, an elastic member is provided between the cloth pushing head 113 and the housing 11, and the elastic member is used to drive the cloth pushing head 113 to rotate toward the first position. During the forward feeding of the housing 11, the reaction force applied by the filter cloth 71 to the cloth pushing head 113 is greater than the elastic force of the elastic member, and the cloth pushing head 113 rotates toward the second position under the driving force of the reaction force of the filter cloth 71. Thus, the cloth pushing head 113 can be automatically switched between the first position and the second position, and can match the cloth pushing and spreading action of the housing 11.

[0104] As an optional solution, when the cloth pushing head 113 rotates to the first position, the height of the axis of the cloth pushing column 1134 is lower than the height of the rotation center of the cloth pushing head 113, thereby ensuring that the cloth pushing head 113 can rotate smoothly to the second position under the reaction force of the filter cloth 71.

[0105] Example 1

[0106] This embodiment uses the attached Figure 1 The sludge laying device and the sludge laying method shown in the figure, wherein the length of the first component 1-1 is 300mm, and the cross-sectional area of ​​the channel at the first end is 25cm 2 , the length at the second end is 200mm and the width is 10mm; the length of the second component 1-2 is 330mm.

[0107] The sludge (adhesion stress 600Pa, water content 82%) was heated at 0.02L / (s·cm 2) The flow is transported to the channels of the first and second components through the third component 1-3, and can flow out evenly through the discharge port of the second component, laying sludge with a thickness of about 10 mm on the filter cloth, and the sludge thickness on the entire filter cloth differs within 1 mm.

[0108] Comparative Example 1

[0109] This comparative example uses the attached Figure 3 Equipment for laying sludge Methods for laying sludge, such as Figure 3 As shown, the cross-sectional area of ​​the first component 1-1' along the sludge flow direction gradually increases, the height of the channel remains basically unchanged on the vertical plane perpendicular to the sludge flow direction, and the width in the horizontal direction perpendicular to the sludge flow direction gradually increases. The first component 1-1' is connected to the second component 1-2' at the first end and to the third component 1-3' at the second end. The cross-sectional area of ​​the channel of the first component 1-1' at the first end is 50cm 2 , the second end cross-sectional area is 20cm 2 ; The length of the first component 1-1' is 300mm, and the length of the second component 1-2' is 330mm.

[0110] The sludge (adhesion stress 600Pa, water content 82%) was heated at 0.02L / (s·cm 2 ) The flow is transported to the channels of the first and second components through the third component 1-3'. The flow of sludge is small on both sides of the discharge port of the second component, and is larger in the middle. The thickness of the sludge laid on the filter cloth is different. The sludge with a thickness of about 10 mm is laid on the filter cloth, and the sludge on the entire filter cloth differs by 2-3 mm.

[0111] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A device for laying sludge, comprising: A mud spreading assembly; wherein the mud spreading assembly comprises a first assembly and a second assembly respectively having channels, the second end of the second assembly is provided with a discharge port, the second end of the first assembly is connected to the first end of the second assembly, so that the first assembly channel is connected to the second assembly channel; the second assembly channel has the same cross section perpendicular to the sludge forward direction, and the bottom surface of the second assembly carrying the sludge is a plane; the cross-sectional area of ​​the first assembly channel at the second end is smaller than the cross-sectional area at the first end, and the cross-sectional area of ​​the second assembly channel is the same as the cross-sectional area of ​​the first assembly channel at the second end; Wherein, in the horizontal direction perpendicular to the sludge flow direction, the width of the second end of the first component channel is greater than the width of the first end; in the vertical direction perpendicular to the sludge flow direction, the height of the second end of the first component channel is less than the height of the first end; Preferably, the first component and the second component are integrally arranged or separately arranged.

2. The device according to claim 1, characterized in that The width of the channel of the first component gradually increases from the first end to the second end; The height of the channel of the first component gradually decreases from the first end to the second end.

3. The device according to claim 1, characterized in that The cross-section of the first component channel at the first end is circular, quasi-circular, polygonal, or elliptical; The first component channel has a polygonal shape with straight lines in the width direction of the cross section at the second end; Preferably, the cross section of the first component channel at the second end is a polygon with upper and lower sides parallel to each other; More preferably, the cross-section of the first component channel at the second end is rectangular or trapezoidal.

4. The device according to any one of claims 1 to 3, characterized in that: The cross-sectional area of ​​the first component channel at the second end is 0.7-1.0 times the cross-sectional area of ​​the first end.

5. The device according to any one of claims 1 to 3, characterized in that: The ratio of the length of the first component in the sludge flow direction to the width of the second end of the first component is 1:0.6 to 1:

3.

6. The device according to any one of claims 1 to 3, characterized in that: In the sludge flow direction, the ratio of the length L1 of the first component to the length L2 of the second component is 1:0.5 to 1:8; Preferably, the cross-section of the second component channel is consistent with the cross-section of the first component channel at the second end.

7. The device according to any one of claims 1 to 3, characterized in that: The mud-laying assembly is placed in the shell; a material-laying opening is provided on the bottom surface of the cavity in the shell, a material-discharging opening at the second end of the second assembly of the mud-laying assembly coincides with the material-laying opening in a direction perpendicular to the bottom surface, and a cross-sectional area of ​​the material-laying opening is greater than or equal to a cross-sectional area of ​​the material-discharging opening at the second end of the second assembly; Preferably, a plurality of groups of mud-laying components are distributed in parallel in the shell; and the discharge ports of the second components are on the same straight line.

8. The device according to claim 7, characterized in that A cloth pushing head that extends downward and can rotate up and down is provided at the first end of the shell near the material laying port and basically parallel to the second end of the second component. The first end of the cloth pushing head is connected to the first end of the shell. During the cloth pushing process, the second front end of the cloth pushing head opposite to the first end is lower than the material laying port, and the height difference between the second end of the cloth pushing head and the material laying port is greater than the thickness of the laid sludge.

9. The device according to claim 8, characterized in that The cloth pushing head includes a first position that can be rotated upward to an upper limit, and a second position that can be rotated downward to a lower limit; In the first position, the second end of the cloth pushing head is higher than the uppermost surface of the laid sludge, and in the second position, the distance between the second end of the cloth pushing head and the laying opening is greater than the thickness of the laid sludge.

10. A method for laying sludge using the sludge laying device according to any one of claims 1 to 3, comprising: The sludge flows into the channel through the first end of the first component and flows onto the filter cloth from the discharge port of the second component; The sludge of the present application has an adhesion stress of 400-1500 Pa and a water content of 75%-88%. The relationship between the unit flow rate of sludge and the cross-sectional area is 0.015~0.04L / (s·cm 2 ).

Images