Sludge screw conveyor

Abstract

The application provides a sludge screw conveyor, which comprises a shell, a spiral blade rotatably arranged in the shell, and a blocking rod arranged on the inner wall of the shell, wherein the axial direction of the blocking rod extends along the axial direction of the spiral blade, and the blocking rod is gapingly distributed with the spiral blade. The sludge screw conveyor is additionally provided with the blocking rod on the shell, so that the sludge screw conveyor can provide a pushing force for sludge during the rotation of the spiral blade, push the sludge into the spiral blade, slow down the accumulation of sludge on the upper part of the shaftless spiral blade, improve the problem of material accumulation and blockage, and ensure the normal work of the sludge screw conveyor.

Description

Technical Field

[0001] This utility model belongs to the field of sludge drying, co-firing, and sludge conveying technology, specifically relating to a sludge screw conveyor. Background Technology

[0002] In the sludge drying and co-firing process, shaftless screw conveyors are mostly used to transport wet sludge.

[0003] In actual operation, the shaftless screw conveyor operates normally with municipal sludge containing 70%-80% moisture content. However, sometimes municipal sludge processed by a plate and frame filter press undergoes changes in moisture content due to storage time, for example, decreasing to around 60%, resulting in increased viscosity. With this type of sludge, the shaftless screw conveyor is prone to material accumulation, leading to deformation and arching of the conveyor casing, high operating current, and even triggering current protection during operation, preventing normal continuous operation.

[0004] Therefore, it is necessary to design a sludge screw conveyor to prevent or reduce the accumulation of wet sludge on the shaftless screw blades, thereby ensuring the continuous operation of the sludge screw conveyor for a long time. Utility Model Content

[0005] To address some or all of the aforementioned technical problems in the prior art, this utility model proposes a sludge screw conveyor. This sludge screw conveyor is equipped with a blocking bar, which can push the sludge into the screw blades, reducing sludge accumulation on the upper part of the shaftless screw blades and improving the problem of material accumulation and blockage.

[0006] According to this utility model, a sludge screw conveyor is provided, including a housing and a spiral blade rotatably disposed within the housing. It also includes a blocking rod disposed on the inner wall of the housing, the axial direction of which extends along the axial direction of the spiral blade, and the blocking rod and the spiral blade are intermittently distributed. It can be seen that within the inner cavity of the housing, the blocking rod extends parallel to the spiral blade. During the rotation and conveying of sludge by the spiral blade, the addition of the blocking rod allows it to converge towards the edge of the housing, promoting the movement of sludge into the spiral blade. This, in turn, causes the sludge to move downstream with the rotation of the spiral blade, reducing sludge accumulation on the spiral blade, improving clogging issues, and thus preventing housing deformation and the sludge screw conveyor's current protection mechanism.

[0007] In one embodiment, the baffle rod is rotatably connected to the housing about its own axis. This arrangement allows the baffle rod to rotate, reducing the accumulation of resistance caused by friction. When sticky sludge comes into contact with the baffle rod, the rotational movement of the baffle rod can peel off the adhering material, reducing the probability of surface scaling. In addition, the rotation of the baffle rod can also generate shear force, promoting the dispersion of sludge clumps. Combined with the axial conveying action of the helical blades, a synergistic "push-loosen" effect is formed, preventing localized accumulation.

[0008] In one embodiment, the two axial ends of the blocking rod are respectively connected to bearings of a bearing assembly, and the bearing seats of the bearing assembly are fixed to the housing. This utilizes the bearing assembly to enable the blocking rod to rotate relative to the housing, effectively taking advantage of the bearing's ability to withstand clearance friction. The high load-bearing capacity of the bearing assembly also ensures stable operation of the blocking rod under stress. The bearing assembly has strong environmental adaptability, which helps to effectively isolate sludge and ensure its service life.

[0009] In one embodiment, each of the bearing housings is connected to the housing via a spacer, the spacer being fixedly connected to the housing. The use of spacers simplifies installation.

[0010] In one embodiment, the bearing housing is detachably connected to the pad. Preferably, the bearing housing is bolted to the pad. This arrangement facilitates installation and disassembly.

[0011] In one embodiment, the gap between the baffle bar and the helical blade is 8-12 mm. This size defines the specific dimensions of the baffle bar relative to the helical blade, effectively balancing frictional resistance and flow efficiency during sludge transport. This size also limits the accumulation space of large sludge clumps while avoiding a sudden increase in shear force caused by excessively small gaps, thus maintaining continuous material flow.

[0012] In one embodiment, the angle formed by the line connecting the midpoint of the helical blade and the midpoint of the blocking rod with the initial rotation line is positive 30 to 60 degrees. During the operation of the sludge screw conveyor, as the helical blade rotates counterclockwise, the upper left side of the helical blade accumulates sludge. Therefore, placing the blocking rod at this location can push the sludge outside the helical blade to the inside of the helical blade to a greater extent, effectively improving the problem of material accumulation.

[0013] In one embodiment, a plurality of the blocking bars are provided on the housing, with adjacent blocking bars spaced apart. This arrangement can reduce manufacturing costs.

[0014] In one embodiment, the spacing between adjacent blocking bars in the axial direction of the helical blades is 2000-4000 mm. This arrangement ensures effective sludge pushing and prevents sludge accumulation.

[0015] In one embodiment, the length of each of the blocking rods is 700-900 mm. This arrangement ensures good working condition, prevents bending, and provides a good pushing effect.

[0016] Compared with the prior art, the advantages of this utility model are as follows: the sludge screw conveyor has a blocking rod added to the shell to provide thrust to the sludge during the rotation of the screw blades, push the sludge into the screw blades, reduce the accumulation of sludge on the upper part of the shaftless screw blades, improve the problem of material accumulation and blockage, and ensure the normal operation of the sludge screw conveyor. Attached Figure Description

[0017] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, in which:

[0018] Figure 1 A sludge screw conveyor according to an embodiment of the present invention is shown;

[0019] Figure 2 A cross-sectional view of a sludge screw conveyor according to an embodiment of the present invention is shown;

[0020] Figure 3 A connection diagram of the stop bar and bearing assembly of a sludge screw conveyor according to an embodiment of the present invention is shown.

[0021] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0022] To make the technical solution and advantages of this utility model clearer, the exemplary embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] An embodiment of this utility model proposes a sludge screw conveyor. For example... Figures 1 to 3 As shown, the sludge screw conveyor includes a casing 1, screw blades 2, and a baffle bar 3. The casing 1 is the main body of the sludge screw conveyor, primarily serving to create a storage space for sludge. Figure 2 As can be seen from the cross-sectional view, the shell 1 mainly includes a U-shaped trough body 11 and a cover plate 12 that covers the upper opening of the body 11. In this application, the shell 1 and the spiral blades 2 of the sludge screw conveyor are prior art and will not be described in detail here.

[0024] According to this application, a blocking rod 3 is added to the housing 1 of the sludge screw conveyor. That is, a blocking rod 3 is installed on the inner wall of the housing 1 of the existing sludge screw conveyor. Specifically, the blocking rod 3 is a rod-shaped member, and after installation, its axial direction extends along the axial direction of the helical blade 2. The blocking rod 3 and the helical blade 2 are spaced apart. It can be seen that in the inner cavity of the housing 1, the blocking rod 3 extends parallel to the helical blade 2. Figure 1 In the middle, the blocking rod 3 and the spiral blade 2 extend axially in the left and right direction. During the rotation and conveying of sludge by the spiral blade 2, the addition of the blocking rod 3 can cause the blocking rod 3 to gather towards the edge of the shell 1 and promote the movement of sludge into the spiral blade 2. In turn, the sludge moves downstream with the rotation of the spiral blade 2, which reduces the accumulation of sludge on the spiral blade 2, improves the clogging problem, and thus avoids deformation of the shell 1 and the current protection of the sludge screw conveyor.

[0025] In a more specific embodiment, the blocking rod 3 is rotatably connected to the housing 1 about its own axis. That is, the blocking rod 3 can be constructed as a pressure roller shaft, rotating relative to the housing 1, and rotating about its own axis during rotation. Structurally, the two ends of the blocking rod 3 are respectively connected to the bearings of the bearing assembly 4. The bearing seats 41 of the bearing assembly 4 are fixed to the housing 1. For example, each bearing seat 41 is connected to the housing 1 by a pad 5. The pad 5 is fixedly connected to the housing 1, for example, by welding or bonding. It can be seen that the blocking rod 3 is installed on the housing 1 by the pad 5 and the bearing assembly 4. Furthermore, by setting the bearing assembly 4, it is also ensured that the blocking rod 3 can rotate relative to the housing 1. The advantages of the bearing assembly 4, such as low friction, are effectively utilized. In particular, the use of the bearing assembly 4 also helps to effectively isolate sludge, thereby extending the service life of the blocking rod 3, etc. During the operation of the sludge screw conveyor, the blocking rod 3 can rotate about its own axis, avoiding the accumulation of resistance caused by direct friction with the sludge. When sticky sludge comes into contact with the baffle rod 3, the rotational motion of the baffle rod 3 can peel off the attached material, reducing the probability of surface scaling. In addition, the rotation of the baffle rod 3 can also generate shear force, promoting the dispersion of sludge clumps. Combined with the axial conveying action of the spiral blades 2, a synergistic "pushing-loosening" effect is formed, preventing localized accumulation. It is easy to understand that the bearing assembly 4 is a sealed bearing assembly, and existing bearing assemblies, such as the UCP series, can be used. The connection between the baffle rod 3 and the bearing assembly 4 is foreseeable to those skilled in the art and will not be elaborated further.

[0026] The bearing housing 41 and the pad 5 are detachably connected. For example, the bearing housing 41 and the pad 5 are connected by bolts. This arrangement facilitates installation, and in particular, it allows for easy disassembly if the bearing assembly and the stop bar 3 need to be replaced or repaired.

[0027] The gap between the blocking rod 3 and the spiral blade 2 is 8-12 mm, for example, 10 mm. This setting effectively balances the frictional resistance and flow efficiency during sludge conveying. This size also limits the accumulation space of large sludge particles while avoiding a sudden increase in shear force caused by too small a gap, thus maintaining continuous material flow.

[0028] The angle formed by the line connecting the midpoint of the helical blade 2 and the midpoint of the blocking rod 3 with the initial rotation line is between +30 and +60 degrees, for example, +45 degrees. The aforementioned initial rotation line refers to the continuous line between the uppermost vertex and the midpoint of the helical blade 2. Figure 2 In the diagram, the line connecting the midpoint of the helical blade 2 and the midpoint of the blocking rod 3 is labeled C, the initial rotation line is labeled B, and the angle formed by the line connecting the midpoints of the helical blade 2 and the blocking rod 3 and the initial rotation line is labeled A. An angle of 30 to 60 degrees represents the orientation of the blocking rod 3 relative to the initial rotation line. Figure 2 In the process of the screw conveyor, if the spiral blade 2 rotates counterclockwise, the blocking rod 3 is located at the upper left of the spiral blade 2. This means that the angle between the line connecting the midpoint of the spiral blade 2 and the midpoint of the blocking rod 3 and the initial rotation line is consistent with the rotation direction of the spiral blade 2. During the operation of the sludge screw conveyor, when the spiral blade 2 rotates counterclockwise, the upper left of the spiral blade 2 becomes the sludge accumulation zone. Therefore, placing the blocking rod 3 at this location can push the sludge outside the spiral blade 2 to the inside of the spiral blade 2 to a greater extent, effectively improving the problem of material accumulation.

[0029] In the specific connection, the stop bar 3 and bearing assembly 4 are pre-installed. The gasket 5 is welded to the mounting position on the side wall of the main body 11. Then, the bearing seat 41 of the bearing assembly 4 with the stop bar 3 is installed onto the corresponding gasket 5, thus completing the installation of the stop bar 3.

[0030] Multiple blocking rods 3 are provided on the housing 1. Adjacent blocking rods 3 are arranged at intervals. The length of the helical blade 2 is 9000 mm. In the axial direction of the helical blade 2, the distance between adjacent blocking rods 3 is 2000-4000 mm, such as 2000 mm, 2500 mm, 3000 mm, etc. The distribution of blocking rods 3 in the axial direction of the helical blade 2 is generally uniform. Arranging multiple blocking rods 3 at intervals along the axial length of the helical blade 2 can also effectively prevent sludge accumulation, eliminating the need for continuous length arrangement, resulting in a relatively simple structure and reduced manufacturing costs. This application provides an example of setting two blocking rods 3. The length of each blocking rod 3 is 700-900 mm, such as 700 mm, 800 mm, 900 mm, etc. The above arrangement limits the length of the blocking rods 3, ensuring that they are not easily deformed while generating a good pushing force against the sludge. This application only provides a specific embodiment; in application, the length of the blocking rods 3 and their specific arrangement on the housing 1 can be adjusted according to actual needs.

[0031] In this application, by setting a blocking rod 3, sludge can be pushed into the interior of the spiral blade 2, reducing or preventing sludge accumulation. Furthermore, by making the blocking rod 3 rotatable, the friction between the blocking rod 3 and the sludge can be reduced, enhancing the blocking rod 3's ability to push sludge into the interior of the spiral blade 2. Moreover, by positioning the blocking rod 3 at the upper left during the counterclockwise rotation of the spiral blade 2, sludge on the outside of the spiral blade 2 can be pushed into the interior of the spiral blade 2 to a greater extent, more effectively improving the problem of material accumulation. Therefore, the sludge screw conveyor of this application can operate continuously for extended periods and has a long service life.

[0032] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the present invention, and all changes and / or modifications made according to the embodiments of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sludge screw conveyor, comprising a housing and rotating screw blades disposed within the housing, characterized in that, It also includes a blocking rod disposed on the inner wall of the housing, the blocking rod extending axially along the axial direction of the helical blade, and the blocking rod being spaced apart from the helical blade.

2. The sludge screw conveyor according to claim 1, characterized in that, The blocking rod is rotatably connected to the housing about its own axis.

3. The sludge screw conveyor according to claim 2, characterized in that, The two axial ends of the blocking rod are respectively connected to the bearings of the bearing assembly, and the bearing housing of the bearing assembly is fixed to the housing.

4. The sludge screw conveyor according to claim 3, characterized in that, Each of the bearing seats is connected to the housing via a pad, and the pad is fixedly connected to the housing.

5. The sludge screw conveyor according to claim 4, characterized in that, The bearing housing is detachably connected to the pad block.

6. The sludge screw conveyor according to any one of claims 1 to 5, characterized in that, The gap between the blocking rod and the spiral blade is 8-12 mm.

7. The sludge screw conveyor according to any one of claims 1 to 5, characterized in that, The angle between the line connecting the midpoint of the helical blade and the midpoint of the blocking rod and the initial rotation line is positive 30 to 60 degrees.

8. The sludge screw conveyor according to any one of claims 1 to 5, characterized in that, Multiple blocking bars are provided on the housing, with adjacent blocking bars arranged at intervals.

9. The sludge screw conveyor according to claim 8, characterized in that, In the axial direction of the helical blade, the spacing between adjacent blocking rods is 2000-4000 mm.

10. The sludge screw conveyor according to claim 9, characterized in that, The length of each of the aforementioned blocking rods is 700-900 mm.

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