Vertical sludge thickening device

Abstract

The present application relates to vertical sludge thickening device, it includes thickening cylinder, filter screen cylinder, stirring mechanism, sludge outlet mechanism, first, second dosing pipe, wherein the stirring mechanism includes first, second, third stirrer, the first stirrer rotates around the vertical direction axis and is relative to the wall of filter screen cylinder and is arranged as spiral piece, the second stirrer rotates around the vertical direction axis and stirs sludge in the up and down direction to form dispersion stirring, the third stirrer rotates around the horizontal direction and stirs sludge from side to middle to form up and down direction mixing stirring;Multiple dosing holes are formed on the first, second dosing pipe respectively, and the reagent sprayed from the dosing hole is respectively arranged to intersect with the movement direction of the second, third stirrer.This application not only completes the uniform mixing of reagent and sludge in the relative dispersion in the stirring process in multiple directions to destroy the cell wall of sludge;And can realize the mixing of reagent and sludge in multiple angles and all directions, and the sludge discharge efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sludge treatment equipment, and particularly relates to a vertical sludge thickening device. BACKGROUND

[0002] For the treatment of sludge, generally, the sludge is first subjected to thickening treatment, and a reagent (for example, a flocculant, a conditioner, etc.) is added to break the cell wall of the sludge, which is beneficial to water discharge. Then, the thickened sludge is transferred from a sludge discharge port to an extrusion channel for extrusion dewatering. Therefore, the thickening effect of the sludge directly affects the subsequent dewatering rate.

[0003] At present, the above-mentioned thickening device generally adopts a vertical type, and includes a vertical thickening cylinder, a filter screen cylinder, a stirring mechanism, and a sludge discharge mechanism. The thickening cylinder is provided with a sludge inlet channel at the top and a sludge discharge channel at the bottom. The thickening cylinder and the filter screen cylinder form a water filtering zone therebetween. The stirring mechanism is located in the filter screen cylinder and forms a thickening zone. In the stirring of the stirring mechanism (and with the aid of the reagent for water discharge), the sludge is thickened and moves downward. The thickened and separated sludge water is filtered from the filter screen cylinder to the water filtering zone. The thickened and separated sludge moves to the sludge discharge channel formed by the sludge discharge mechanism.

[0004] However, through actual operation, the above-mentioned thickening device has the following technical problems:

[0005] 1) Since the stirring motion direction formed by the stirring mechanism is single (without any change), the reagent and the sludge are not mixed sufficiently, and the water discharge rate of flocculation and thickening cannot reach the best, that is, the cell wall of the sludge cannot be optimally broken to form a higher water discharge rate. At the same time, the reagent addition method and position are very important, which directly affect the flocculation effect of the sludge.

[0006] 2) Under the driving of the stirring mechanism, the sludge is gathered downward after being separated from the filter screen cylinder, and flows to the sludge discharge channel in the mutual extrusion of the sludge itself. Once the stirring mechanism is far away from the sludge discharge channel, the sludge of the separated sludge water is likely to form a blockage at the sludge discharge channel, which results in a low sludge discharge rate and further affects the thickening efficiency. SUMMARY

[0007] The present application solves the technical problems of the prior art, and provides an improved vertical sludge thickening device.

[0008] To solve the above technical problems, the present application adopts the following technical solutions:

[0009] The vertical sludge concentration device comprises a concentration cylinder, a filter screen cylinder, a stirring mechanism and a sludge outlet mechanism, wherein the concentration cylinder is arranged along the up-down direction, the concentration cylinder comprises an upper cylinder body and a lower cylinder body, the filter screen cylinder is arranged in the upper cylinder body and a filter water cavity is formed between the inner and outer walls of the filter screen cylinder; the stirring mechanism comprises a first stirrer, a second stirrer and a third stirrer which are sequentially and spacedly arranged from top to bottom, the first stirrer rotates around a vertical axis and is arranged in a spiral blade mode against the inner wall of the filter screen cylinder, the second stirrer and the third stirrer are arranged in the lower cylinder body, the second stirrer rotates around a vertical axis and stirs the sludge in the up-down direction to form a dispersion stirring, and the third stirrer rotates around a horizontal direction and stirs the sludge from the side to the center to form an up-down direction mixing stirring; the vertical sludge concentration device further comprises a first dosing pipe and a second dosing pipe which are inserted into the lower cylinder body from the outside of the lower cylinder body and are arranged above the second stirrer and the third stirrer respectively, wherein a plurality of dosing holes are formed on the first dosing pipe and the second dosing pipe respectively, and the dosing holes are arranged to intersect with the movement directions of the second stirrer and the third stirrer respectively.

[0010] In some specific embodiments, the first dosing pipe has a plurality of pipes which are spacedly arranged around the stirring shaft of the second stirrer, preferably, the first dosing pipe has four or five or six (or more) pipes which can simultaneously and synchronously introduce the medicament into the sludge, so that the mixing of the sludge and the medicament is more uniform, in this case, the first dosing pipe has four pipes which are arranged in a cross shape, and the stirring shaft of the second stirrer passes through the center of the cross shape.

[0011] According to one specific and preferred aspect of the present application, the dosing holes on the plurality of first dosing pipes are arranged in a ring shape around the center of the stirring shaft, wherein the diameters between the plurality of rings are arranged in an arithmetic progression. Here, the dosing holes are spacedly arranged, so that the dosing area is effectively divided, especially the formed dosing area is annular and covers the entire radial direction of the lower cylinder body, so that the medicament is relatively uniformly mixed with the sludge.

[0012] Preferably, each first dosing pipe is formed by cutting the upper and lower sides of the cylindrical pipe along the length direction to form a cutting surface, and each dosing hole vertically extends inward from the end surface of the cutting surface and communicates with the internal cavity of the first dosing pipe. Here, by the arrangement of the cutting surface, on the one hand, when the sludge moves upward or downward along the cylindrical pipe, part of the sludge will move along the tangent direction, and a small amount of sludge will move upward and downward along the cutting surface, therefore, the medicament sprayed from the dosing hole can easily disperse the sludge on the cutting surface to form a dispersion gap, that is, the medicament can more effectively disperse and mix with the sludge; on the other hand, the arrangement of the cutting surface is beneficial to the forming processing of the dosing hole (in addition, it can also reduce the probability of the dosing hole being blocked).

[0013] In some embodiments, the cutting surface is a flat surface aligned vertically or a concave surface concaved inward from both sides. Theoretically, the concave surface is better (but it is difficult to clean because of the dirt accumulation), however, the flat surface is more convenient for practical use.

[0014] In some embodiments, each cutting surface is formed between two adjacent first dosing pipes. This design can better complete the mixing of the medicament.

[0015] According to another embodiment and preferred aspect of the present application, the second agitator comprises an agitator shaft coaxial with the first agitator and moving synchronously, a plurality of agitator blades extending radially along the agitator shaft and arranged vertically, some of the plurality of agitator blades being inclined inwardly and some being inclined outwardly, and forming upper and lower dispersion paddles in the vertical direction. Thus, the first agitator and the second agitator share a power unit, and the mixing of the medicament and the sludge is better completed in the vertical movement of the sludge.

[0016] Preferably, the upper and lower dispersion paddles have the same structure and each comprises four agitator blades with their center lines arranged in a cross shape, and two of the agitator blades in the same center line direction are arranged intersecting each other, so that the upward and downward moving parts of the sludge can be relatively transposed and dispersed, which not only can better complete the mixing of the sludge and the medicament, but also can delay the downward flow of the sludge and thus improve the mixing quality. In some embodiments, the two agitator blades in the same center line direction form a blade group, and the two blade groups are vertically staggered.

[0017] According to another embodiment and preferred aspect of the present application, the second dosing pipe is located above the stirring center formed by the third agitator, and the second dosing pipe is cut from the bottom of the cylindrical pipe to form a cutting surface, the cutting surface faces downward and is located below the top of the third agitator; each dosing hole extends vertically upward from the cutting surface and communicates with the internal cavity of the second dosing pipe. The position distribution of the dosing pipe is very important, because the sludge stirred from both sides to the middle converges along the two sides of the cylindrical pipe to the middle, therefore, the sludge below the cutting surface is relatively loose, and thus the medicament sprayed from the dosing hole can easily disperse the sludge adhering to the cutting surface to form a dispersion gap, that is, the medicament can be more effectively dispersed and mixed with the sludge, and the cutting surface is beneficial to the forming processing of the dosing hole (in addition, it can also reduce the probability of the dosing hole being blocked).

[0018] In addition, the third stirrer comprises two groups of stirring paddles which are synchronously and oppositely stirred, wherein each stirring paddle comprises a stirring shaft, a plurality of stirring blades which are distributed along the length direction of the stirring shaft, the two stirring shafts are parallel and arranged in left-right alignment with respect to the second dosing pipe, and the stirring blades of the two groups of stirring paddles are oppositely and staggeredly distributed. Not only the stirring mixing effect can be achieved, but also the sludge discharging efficiency can be improved.

[0019] Preferably, in the axial projection of the stirring shaft, the stirring blades are crossly distributed and form annular stirring zones, the two annular stirring zones of the two groups of stirring paddles are intersectingly arranged, the cutting surface is horizontally arranged, the center line of the dosing hole is relatively coincided with the line connecting the upper and lower intersection points of the intersecting region formed by the two annular stirring zones. In this layout, the mixing of the medicament in the up-down direction can be more facilitated.

[0020] Preferably, for the first stirrer, the flow channel hole is formed by the inner side of the spiral stirring blade, in the stirring process, the water inside the sludge can be gathered to the flow channel hole and also flow upward along the stirring shaft of the first stirrer, and then discharged to the water filtering cavity.

[0021] Preferably, the lower cylinder comprises a first straight cylinder, a tapered cylinder with gradually decreasing inner diameter, a second straight cylinder vertically extended downward from the bottom of the tapered cylinder, wherein the second stirrer is located in the first straight cylinder, and the upper part of the third stirrer is located in the tapered cylinder and the lower part is located in the second straight cylinder. In some specific embodiments, the annular stirring zones formed by the end parts of the stirring blades of the second stirrer and the third stirrer are relatively close to the inner walls of the first straight cylinder and the second straight cylinder.

[0022] Thanks to the implementation of the above technical solutions, the present application has the following advantages compared with the prior art:

[0023] The existing sludge concentration device cannot simultaneously meet the requirements of diversified stirring, full mixing of the medicament and the sludge to destroy the cell wall of the sludge, high concentration effluent rate and high sludge discharge efficiency, and the present application ingeniously solves various deficiencies of the existing structure by overall design of the structure of the concentration device. After the sludge enters the concentration area, the sludge and water are separated by the stirring of the spiral blade, the sludge is pushed downward, the sludge and water are filtered to the water filtering cavity, then the medicament is added, the medicament and the sludge are mixed by the up-down direction dispersion stirring formed by the second stirrer, then the medicament is added again and mixed in the process of stirring from the side to the middle, the sludge with destroyed cell wall is discharged from the sludge discharge mechanism to complete the concentration of the sludge. Therefore, compared with the existing structure, the concentration device of the present application can not only implement multi-direction stirring, but also complete the uniform mixing of the medicament and the sludge in the relative dispersion in the stirring process, which is very beneficial to the destruction of the cell wall of the sludge by the medicament to improve the effluent rate of the sludge concentration; on the other hand, the directions of the two medicament injection are intersected and are intersected or / and the same as the movement directions of the sludge in the corresponding area to realize the multi-angle and omnidirectional mixing of the medicament and the sludge; thirdly, the third stirrer located at the lowermost position is provided, which not only completes the mixing of the medicament and the sludge, but also increases the sludge discharge efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0025] Figure 1 It is a structural schematic view of the vertical sludge concentration device of the present application;

[0026] Figure 2 It is a structural schematic view of the vertical sludge concentration device of the present application; Figure 1

[0027] Figure 3 It is a structural schematic view of the vertical sludge concentration device of the present application; Figure 1

[0028] Figure 4 It is a sectional view of the first medicament adding pipe of the present application (enlarged);

[0029] Figure 5 It is a sectional view of the second medicament adding pipe of the present application (enlarged);

[0030] 1, concentration cylinder; 10, upper cylinder body; 11, lower cylinder body; 111, first straight cylinder; 112, tapered cylinder; 113, second straight cylinder;

[0031] 2, filter screen cylinder; Q, water filtering cavity;

[0032] ​​3, stirring mechanism; 31, first stirrer; 310, stirring shaft; 311, helical blade; 32, second stirrer; 320, stirring shaft; 321, stirring blade; a, upper dispersion paddle; b, lower dispersion paddle; 33, third stirrer; 330, stirring paddle; s1, stirring shaft; s2, stirring paddle;

[0033] 4, mud outlet mechanism;

[0034] 5, first dosing pipe; 50, dosing hole; 5a, cutting surface;

[0035] 6, second dosing pipe; 60, dosing hole; 6a, cutting surface; h, annular stirring zone. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more apparent, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] like Figures 1 to 3 As shown, the vertical sludge thickening device of this embodiment includes a thickening cylinder 1, a filter cylinder 2, a stirring mechanism 3, a sludge discharge mechanism 4, a first dosing pipe 5, and a second dosing pipe 6. The thickening cylinder 1 is arranged vertically and includes an upper cylinder 10 and a lower cylinder 11. The filter cylinder 2 is located inside the upper cylinder 10, and a filtration chamber Q is formed between the inner and outer walls of the two. The stirring mechanism 3 includes a first stirrer 31, a second stirrer 32, and a third stirrer 33 distributed from top to bottom at intervals. The sludge discharge mechanism 4 is located on one side of the lower cylinder 11.

[0043] Specifically, the upper cylinder 10 is a cylindrical shape, the filter cylinder 2 and the upper cylinder 10 are concentrically arranged, and the lower cylinder 11 includes, from top to bottom, a first straight cylinder 111, a cone cylinder 112 with a gradually decreasing inner diameter, and a second straight cylinder 113 extending vertically downward from the bottom of the cone cylinder 112. The first stirrer 31 is installed inside the filter cylinder 2, the second stirrer 32 is located inside the first straight cylinder 111, and the upper part of the third stirrer 32 is located inside the cone cylinder 112 and the lower part is located inside the second straight cylinder 113.

[0044] In this example, the first agitator 31 includes an agitator shaft 310 extending in the up-down direction, and a plurality of helical blades 311 spirally wound on the agitator shaft 310, wherein the circumferential surface formed by the plurality of helical blades 311 is attached to the inner wall of the filter screen cylinder 2, and the connection between the plurality of helical blades 311 and the agitator shaft 310 forms a flow channel hole. During stirring, the water inside the sludge can converge to the flow channel hole and also flow upward along the agitator shaft 310 of the first agitator 31, and then be discharged to the water filtering cavity Q. The second agitator 32 rotates around the vertical axis and stirs the sludge in the up-down direction to form a dispersion stirring. Specifically, the second agitator 32 includes an agitator shaft 320 coaxial with and synchronous with the first agitator 31, a plurality of stirring blades 321 extending radially along the agitator shaft 320 and arranged in an up-down inclined manner, and a part of the plurality of stirring blades 321 are inclined inward and a part of the plurality of stirring blades 321 are inclined outward, and the up-down direction forms an upper dispersion paddle a and a lower dispersion paddle b. In this example, the upper dispersion paddle a and the lower dispersion paddle b are both single groups, and the structure of the upper dispersion paddle a and the lower dispersion paddle b is the same, both including four stirring blades 321 with a cross-shaped center line, wherein two stirring blades 321 in the same center line direction are intersected, and two stirring blades 321 in the same center line direction form a blade group, and the two blade groups are distributed in an up-down staggered manner, so that a plurality of layers of dispersion stirring are formed in the up-down direction. The third agitator 33 rotates around the horizontal direction and stirs the sludge from the side to the middle to form an up-down direction mixing stirring. Specifically, the third agitator 33 includes two groups of stirring paddles 330 which are synchronous and opposite to each other, wherein each stirring paddle 330 includes an agitator shaft s1 and a plurality of stirring paddles s2 distributed in a length direction of the agitator shaft s1, the two agitator shafts s1 are parallel and arranged in left-right alignment, and the stirring paddles s2 of the two groups of stirring paddles 330 are relatively staggered, wherein in the axial projection along the agitator shaft s1, the stirring paddles s2 are cross-shaped and form a ring-shaped stirring area, and the two ring-shaped stirring areas of the two groups of stirring paddles are intersected.

[0045] In this example, the sludge discharging mechanism 4 is specifically the sludge discharging mechanism involved in ZL201921320400.5, and the first dosing pipe 5 and the second dosing pipe 6 are inserted into the lower cylinder 11 from the outside of the lower cylinder 11.

[0046] Specifically, the first dosing pipe 5 is located below the first agitator 31 and above the second agitator 32. In this example, the first dosing pipe 5 has four roots, and the four first dosing pipes 5 are distributed in a cross shape, and the center of the cross can pass through the agitator shaft 320 of the second agitator 32. A plurality of dosing holes 50 are arranged side by side along the length direction of each first dosing pipe 5, and the dosing holes 50 on the four first dosing pipes 5 are distributed in a ring shape with the center of the agitator shaft 320 as the center, wherein the diameters between the multiple rings are distributed in an arithmetic progression.

[0047] In combination Figure 1 ,3 As shown in FIG. 4, each first dosing pipe 5 is formed by cutting the upper and lower sides of the cylindrical pipe along the length direction to form a cutting surface 5a, and each dosing hole 50 extends vertically from the end surface of the cutting surface 5a to the internal cavity of the first dosing pipe 5. In some embodiments, the cutting surface 5a is a plane aligned vertically, and each adjacent two first dosing pipes 5 form a dosing area corresponding to a cutting surface 5a.

[0048] In combination Figure 1 , 2 As shown in FIG. 5, the second dosing pipe 6 is a single pipe and crosses the conical cylinder 112. In this example, the second dosing pipe 6 is located above the stirring center formed by the third stirrer 33, and the second dosing pipe 6 is cut from the bottom of the cylindrical pipe to form a cutting surface 6a, which is downward and below the top of the third stirrer 33. Each dosing hole 60 extends vertically upward from the cutting surface to the internal cavity of the second dosing pipe 6.

[0049] Further, the cutting surface 6a is horizontally arranged, and the center line of the dosing hole 60 is relatively coincident with the line connecting the upper and lower intersection points of the intersection area formed by the two annular stirring areas h of the two groups of stirring paddles 330, and the cutting surface 6a is located between the top of the annular stirring area and the upper intersection point.

[0050] In addition, in order to further achieve the best effect of mixing the medicament, different medicaments are added to the first dosing pipe 5 and the second dosing pipe 6, and the directions of the medicaments sprayed from the first dosing pipe 5 and the second dosing pipe 6 are perpendicular to each other, that is, the sprayed medicaments are perpendicular or parallel to the direction of the sludge movement, which can completely mix the medicaments and the sludge at multiple angles and in all directions to achieve the best effect of destroying the cell wall of the sludge.

[0051] As can be seen from the above, by using the device, after the sludge enters the concentration area, it is first stirred by the spiral blade to separate the sludge and water, and the sludge is pushed downward, and the sludge and water are filtered into the water filtering cavity. Then, medicaments are added, and the medicaments are mixed with the sludge by the upward and downward direction dispersion stirring formed by the second stirrer, and then the medicaments are added again and mixed in the process of stirring from the side to the middle. The sludge with the destroyed cell wall is discharged from the sludge discharging mechanism to complete the concentration of the sludge. Therefore, compared with the existing structure, the concentration device of the present application can not only implement multiple direction stirring, but also complete the uniform mixing of the medicaments and the sludge in the relative dispersion during the stirring process, which is very beneficial to the destruction of the cell wall of the sludge by the medicaments to improve the water yield rate of the sludge concentration. On the other hand, by intersecting the directions of the two medicament injections and the directions of the corresponding sludge movement, the medicaments and the sludge are mixed at multiple angles and in all directions. Thirdly, by arranging the third stirrer at the lowermost position, the mixing of the medicaments and the sludge is completed, and the sludge discharging efficiency is increased.

[0052] The above detailed description of the application is intended to be illustrative and not limiting. Other alternatives will be apparent to those of skill in the art without departing from the spirit of the present application and the above detailed description is intended to embrace all such alternatives.

Claims

1. A vertical sludge thickening device comprising a thickening cylinder, a filter screen cylinder, a stirring mechanism, and a sludge discharge mechanism, wherein the thickening cylinder is arranged in the vertical direction, characterized in that: The concentration cylinder comprises an upper cylinder body and a lower cylinder body, a filter screen cylinder is located in the upper cylinder body and a filter water cavity is formed between the inner and outer walls of the two, the stirring mechanism comprises a first stirrer, a second stirrer and a third stirrer which are sequentially and spaced distributed from top to bottom, the first stirrer rotates around a vertical direction axis and is relatively attached to the inner wall of the filter screen cylinder in the form of a spiral blade, the second stirrer and the third stirrer are located in the lower cylinder body, the second stirrer rotates around a vertical direction axis and stirs the sludge in the up-down direction to form a dispersion stirring, the third stirrer rotates around a horizontal direction and stirs the sludge from the side to the middle to form an up-down direction mixing stirring, the vertical sludge concentration device further comprises a first dosing pipe and a second dosing pipe which are inserted into the lower cylinder body from the outside of the lower cylinder body and are respectively located above the second stirrer and the third stirrer, wherein a plurality of dosing holes are respectively formed on the first dosing pipe and the second dosing pipe, the dosing agents sprayed from the dosing holes are respectively arranged to intersect with the movement direction of the second stirrer and the third stirrer, the first dosing pipe has a plurality of roots and is spaced distributed around the stirring shaft of the second stirrer, each first dosing pipe forms a cutting surface by cutting the upper and lower sides of the cylindrical pipe along the length direction, the cutting surface is an upper and lower aligned plane or an inwardly recessed inner recessed surface from the upper and lower sides, and a cutting surface is correspondingly distributed between each adjacent two first dosing pipes, and each dosing hole vertically extends inwardly from the end surface of the cutting surface and communicates with the internal cavity of the first dosing pipe.

2. The vertical sludge thickener device according to claim 1, characterized in that: The dosing holes on the plurality of first dosing pipes are annularly distributed with the center of the stirring shaft as the center, and the diameters between the plurality of rings are distributed in an arithmetic progression.

3. The vertical sludge thickener as claimed in claim 1, wherein: The first dosing pipe has four roots and is distributed in the form of a cross, and the stirring shaft of the second stirrer passes through the center of the cross.

4. The vertical sludge thickener as claimed in claim 1, wherein: The second stirrer comprises a stirring shaft which is coaxial with the first stirrer and moves synchronously, a plurality of stirring blades which extend radially along the stirring shaft and are arranged in an up-down inclined manner, and a plurality of the stirring blades are partially inclined inwardly and partially inclined outwardly, and form upper and lower dispersion paddles in the up-down direction.

5. A vertical sludge thickening device according to claim 4, characterised in that: The upper and lower dispersion paddles have the same structure and each comprise four stirring blades which are distributed in the form of a cross along the center line, and two stirring blades located in the same center line direction are arranged to intersect.

6. The vertical sludge thickener device according to claim 5, characterized in that: Two stirring blades located in the same center line direction form a blade group, and two blade groups are distributed in an up-down staggered manner.

7. The vertical sludge thickener of claim 1, wherein: The second dosing pipe is located above the stirring center formed by the third stirrer, and the second dosing pipe is cut from the bottom of the cylindrical pipe to form a cutting surface, the cutting surface faces downward and is located below the top of the third stirrer, and each dosing hole vertically extends upward from the cutting surface and communicates with the internal cavity of the second dosing pipe.

8. The vertical sludge thickener device according to claim 7, characterized in that: The third stirrer comprises two groups of stirring paddles which stir synchronously and oppositely, each stirring paddle comprises a stirring shaft and a plurality of stirring paddles which are spaced distributed along the length direction of the stirring shaft, two stirring shafts are parallel and arranged in left-right alignment with respect to the second dosing pipe, and the stirring paddles of the two groups of stirring paddles are relatively distributed in a staggered manner.

9. The vertical sludge thickener device according to claim 8, characterized in that: The stirring blades are cross-distributed along the axial projection of the stirring shaft, and form annular stirring zones, and the two annular stirring zones of the two groups of stirring blades are arranged in intersection, the cutting surface is arranged horizontally, and the center line of the dosing hole is relatively coincident with the line connecting the upper and lower intersection points of the intersection region formed by the two annular stirring zones.

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