Anti-overflow reverse feeding mechanism and thickener

Abstract

The utility model relates to the technical field of solid-liquid separation, in particular to an anti-overflow reverse feeding mechanism and a thickener, the feeding mechanism comprises a material distribution outer barrel, a material distribution inner barrel and a feeding pipe, the material distribution outer barrel is arranged on the outer side of the material distribution inner barrel, and the top end of the material distribution outer barrel and the top end of the material distribution inner barrel are each of an open structure; the feeding pipe is located on the lower portion of the outer side of the outer distributing cylinder, and one end of the feeding pipe penetrates through the outer distributing cylinder to be communicated with the annular channel. The feeding mechanism further comprises an anti-overflow structure, the anti-overflow structure comprises an overflow outer cylinder and an overflow bottom plate, the overflow outer cylinder surrounds the upper portion of the outer side of the distribution outer cylinder, the top end of the overflow outer cylinder is of an open structure, and the bottom end of the overflow outer cylinder is connected with the distribution outer cylinder through the overflow bottom plate. According to the feeding mechanism provided by the invention, a turbulent flow phenomenon of clarified liquid in the concentration tank caused by overflowing of a material flow with relatively high kinetic energy from the top end can be avoided, so that the solid-liquid separation effect of the thickener is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of solid-liquid separation, and in particular to an anti-overflow reverse feeding mechanism and a thickener. Background Art

[0002] A thickener is a solid-liquid separation equipment based on gravity sedimentation. It can concentrate low-concentration materials to a certain concentration for sedimentation and recover clarified water. It is widely used in production sites such as hydrometallurgy, mineral processing plants, and chemical plants that require solid-liquid enrichment and separation. A thickener generally includes a thickening tank body and a feeding device and a stirring device placed in the thickening tank body. The material to be processed is transported to the feeding device for flocculation and then discharged into the thickening tank body. The slurry with higher density tends to settle to the bottom of the thickening tank to form a concentrated slurry bed, while the clarified liquid with lower density deviates to the top of the thickening tube. In addition, the stirring of the stirring device in the thickening tank body further improves the separation effect, and the concentrated solids that have settled to the bottom can be swept to the center of the tank body for discharge.

[0003] Among them, the feeding device is the key technology of the thickener, which mainly plays the role of mixing flocculants and dispersing slurry. It is usually located in the center of the thickener. The structural design of the feeding device can reduce the disturbance of the material flow, make the flocculant fully react, and evenly distribute the outflowing material. The existing technology of the applicant's patent number 202410241642.4 provides a reverse feeding device to improve the flocculation effect. It sets an annular channel between the inner cylinder and the outer cylinder, so that the feed slurry rotates and rises in the annular channel in the reverse direction to achieve the rectification of the material flow and carry out sufficient flocculation reaction, and then falls into the concentration tank through the channel of the inner cylinder for sedimentation and separation. However, since the top of the inner cylinder and the outer cylinder are open structures, some materials often overflow from the top into the concentration tank, thereby causing the upper clarified liquid in the concentration tank to be stirred, affecting the solid-liquid separation effect. Utility Model Content

[0004] The purpose of this application is to provide an anti-overflow reverse feeding mechanism and a thickener to solve the problems existing in the above-mentioned prior art.

[0005] The embodiments of the present application can be implemented through the following technical solutions:

[0006] A reverse feeding mechanism with overflow prevention comprises an outer cloth cylinder, an inner cloth cylinder, and a feeding pipe, wherein the outer cloth cylinder is arranged on the outside of the inner cloth cylinder, the top ends of the outer cloth cylinder and the inner cloth cylinder are both open structures, and the bottom ends are connected through the bottom of the cylinder to form an annular channel, and the feeding pipe is located at the lower part of the outer side of the outer cloth cylinder, and one end thereof passes through the outer cloth cylinder and is connected with the annular channel. The feeding mechanism also comprises an overflow prevention structure, which comprises an overflow outer cylinder and an overflow bottom plate, and the overflow outer cylinder is surrounded by the upper part of the outer side of the outer cloth cylinder, the top end of which is an open structure, and the bottom end is connected to the outer cloth cylinder through the overflow bottom plate.

[0007] Furthermore, a plurality of overflow ports are evenly arranged along the circumference of the overflow outer cylinder at the lower portion of the overflow outer cylinder.

[0008] Furthermore, the top of the outer cloth cylinder is higher than the top of the inner cloth cylinder, and the top of the overflow outer cylinder is higher than the top of the outer cloth cylinder.

[0009] Furthermore, the outer cloth cylinder, the inner cloth cylinder and the overflow outer cylinder are coaxially arranged.

[0010] Furthermore, the anti-overflow structure also includes a plurality of reinforcing connecting rods, which are evenly arranged along the circumferential direction between the cloth outer cylinder and the overflow outer cylinder, and the two ends of each reinforcing connecting rod are fixedly connected to the outer wall of the cloth outer cylinder and the inner wall of the overflow outer cylinder respectively.

[0011] A thickener comprises a tank body, a driving mechanism, a stirring mechanism and any one of the above-mentioned feeding mechanisms; the feeding mechanism is coaxially arranged on the upper part of the tank body, and its bottom end is lower than the top end of the tank body; the driving mechanism comprises a motor and a driving shaft, the motor is arranged above the feeding mechanism, the driving shaft is coaxially arranged with the tank body, the upper end of the driving shaft is fixedly connected to the motor shaft of the motor, and the lower end thereof passes through the feeding mechanism and is connected to the stirring mechanism located below the driving mechanism.

[0012] Furthermore, the tank body includes a straight cylindrical portion, a conical portion and a collection barrel coaxially arranged from top to bottom; an overflow groove is provided at the top of the straight cylindrical portion, and an overflow outlet is provided on the overflow groove for discharging the clarified liquid in the upper part of the tank body; the collection barrel is provided with a discharge port for discharging the concentrated solid material in the lower part of the tank body.

[0013] Furthermore, the stirring mechanism includes a first rake frame and a second rake frame alternately arranged along the driving shaft, and the radial length of the first rake frame is greater than the radial length of the second rake frame.

[0014] Furthermore, the first rake frame includes a first supporting structure, which is fixedly connected to the drive shaft and extends radially outward along the axis of the tank body, while being synchronously inclined upward with the bottom of the conical portion; a plurality of first scrapers are provided below the first supporting structure; the second rake frame includes a second supporting structure, which is fixedly connected to the drive shaft and extends radially outward along the axis of the tank body, while being synchronously inclined upward with the bottom of the conical portion; a plurality of second scrapers are provided below the second supporting structure; the radial distance of the first supporting structure is greater than the radial distance of the second supporting structure.

[0015] Furthermore, an extension direction of the first scraper forms a non-zero angle with an extension direction of the first supporting structure; and an extension direction of the second scraper forms a non-zero angle with an extension direction of the second supporting structure.

[0016] The embodiments of the present application provide an anti-overflow reverse feeding mechanism and a thickener having at least the following beneficial effects: by setting an anti-overflow mechanism on the outside of the outer material distribution cylinder, the present application can avoid the overflow of the material flow with large kinetic energy from the top and cause turbulence in the clarified liquid of the concentration tank, thereby ensuring the solid-liquid separation effect of the thickener. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of the feeding mechanism provided in the embodiment of the present application;

[0018] Figure 2 A schematic diagram of the position of the guide plate inside the feed mechanism provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the internal structure of the feeding mechanism provided in an embodiment of the present application;

[0020] Figure 4 A cross-sectional view of a feeding mechanism provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the overall structure of the thickener provided in an embodiment of the present application;

[0022] Figure 6 A side view of a thickener provided in an embodiment of the present application;

[0023] Figure 7 for Figure 6 CC line cross-sectional view;

[0024] Numbers in the figure

[0025] Tank body 1, straight cylinder portion 11, tapered portion 12, collecting barrel 13, discharge pipe 131, overflow trough 14, feeding mechanism 2, material distribution outer cylinder 21, material distribution inner cylinder 22, guide plate 23, feeding pipe 24, anti-overflow structure 25, overflow outer cylinder 251, overflow port 252, overflow bottom plate 253, reinforcing connecting rod 254, cylinder bottom 26, bulk material structure 27, hub 271, blades 272, material guide cone 273, support rod 274, support plate 275, dosing port 28, driving mechanism 3, motor 31, driving shaft 32, stirring mechanism 4, first rake frame 41, first supporting structure 411, first reinforcing structure 412, first scraper 413, second rake frame 42, second supporting structure 421, second reinforcing structure 422, second scraper 423, step ladder 51, maintenance channel 52, bracket 6, extension pipe 7; DETAILED DESCRIPTION

[0026] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0027] In addition, various components in the drawings are enlarged or reduced in size for ease of understanding, but this is not intended to limit the scope of protection of this application.

[0028] Words importing the singular include the plural and vice versa.

[0029] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance. Their names may be different in the detailed description and claims of the present application.

[0030] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0031] The embodiment of the present application provides a feeding mechanism, combined with Figures 1-4 As shown, it includes an outer cloth cylinder 21, an inner cloth cylinder 22 and a material inlet pipe 24; wherein, the inner cloth cylinder 22 and the outer cloth cylinder 21 are coaxially arranged in sequence from the inside to the outside; specifically, the upper and lower ends of the inner cloth cylinder 2 are both open structures, the outer cloth cylinder 21 surrounds the outside of the inner cloth cylinder 22, its upper end is an open structure, and its top end is higher than the top end of the inner cloth cylinder 22, and its bottom end is watertightly connected to the bottom end of the inner cloth cylinder 22 through the cylinder bottom 26, that is, the cylinder walls of the inner cloth cylinder 22 and the outer cloth cylinder 21 and the cylinder bottom 26 together form an annular channel for accommodating and guiding the flow of slurry.

[0032] The feed pipe 24 is located at the bottom of the outer distribution cylinder 21. One end of the feed pipe is used for watertight connection with an external feed pipe, and the other end spirally and tangentially enters the outer distribution cylinder 21. During use, the slurry to be separated enters the annular channel between the outer distribution cylinder 21 and the inner distribution cylinder 22 through the feed pipe 24. Under the action of pressure, it gradually rises to the top of the inner distribution cylinder 22, then enters the inner distribution cylinder 22. Under the action of gravity, it sinks downward from the top of the inner distribution cylinder 22 and continues to sink from the bottom of the inner distribution cylinder 22 into the thickener tank for separation and aggregation. In some specific embodiments, the outer distribution cylinder 21, inner distribution cylinder 22, feed pipe 24, cylinder bottom 26, etc. can be made of wear-resistant metal materials through sheet metal forming combined with welding, riveting, and other processes. In addition, a wear-resistant layer can be provided on the parts that come into contact with the slurry to extend the service life of the equipment. Through the design of the reverse feeding structure, the slurry enters from the bottom. During the rising process, its kinetic energy is continuously weakened due to its own gravity and the resistance of the water flow below the liquid surface, thereby ensuring sufficient reaction between the slurry and the added flocculant to form larger flocs as possible, effectively improving the flocculation effect.

[0033] However, since the top ends of the outer cloth cylinder 21 and the inner cloth cylinder 22 are both open structures, part of the reverse rising slurry with greater kinetic energy overflows from the top end of the outer cloth cylinder 21 into the tank body 1, and this part of the slurry will cause the slurry in the tank body to be stirred to form turbulence, thereby affecting the solid-liquid separation effect. For this reason, an anti-overflow structure 25 is provided on the outer side of the upper part of the outer cloth cylinder 21, which includes an overflow outer cylinder 251 coaxially arranged with the outer cloth cylinder 21, and the top end of the overflow outer cylinder 251 is an open structure, and It is higher than the top of the distribution outer cylinder 21, and its bottom end is watertightly connected to the distribution outer cylinder 21 through the overflow bottom plate 253, together forming a space for accommodating overflow slurry; further, the lower part of the overflow outer cylinder 251 is evenly arranged along the circumference of the cylinder wall to have a number of overflow ports 252. The slurry overflowing from the top of the distribution outer cylinder 21 is first gathered in the anti-overflow structure 25, and then evenly dispersed and flowed out from each overflow port 252, which greatly reduces the kinetic energy of the overflow slurry and prevents it from causing the liquid in the tank 1 to stir and form turbulence.

[0034] In some preferred embodiments, the anti-overflow structure 25 also includes a plurality of reinforcing connecting rods 254, which are evenly arranged along the circumferential direction between the cloth outer cylinder 21 and the overflow outer cylinder 251. The two ends of each reinforcing connecting rod 254 are respectively fixedly connected to the outer wall of the cloth outer cylinder 21 and the inner wall of the overflow outer cylinder 251 to play a fixed supporting role.

[0035] In addition, in order to make the slurry rise in the opposite direction between the inner cloth cylinder 22 and the outer cloth cylinder 21, it is generally necessary to ensure the pressure of the slurry when it enters the outer cloth cylinder 21 through the feed pipe 24. However, increasing the pressure there will intensify the turbulence of the slurry in the lower part of the outer cloth cylinder 21. On the contrary, if the feed pressure is reduced, it will not only reduce the processing efficiency, but may also cause the slurry to rise to the upper part of the outer cloth cylinder 21. When the slurry rises to the upper part of the outer cloth cylinder 21, the larger flocs that have been condensed will fall vertically, thereby causing turbulence in the upper part of the outer cloth cylinder 21. The above-mentioned turbulence occurring in the lower and upper parts of the outer cloth cylinder 21 is caused by different reasons. Obviously, it is difficult to solve the above problems at the same time by simply adjusting the feed pressure. Therefore, in some preferred embodiments of the present application, a spirally ascending material guide plate 23 is further provided between the outer fabric cylinder 21 and the inner fabric cylinder 22. The material guide plate 23 can be made of wear-resistant metal or other materials, and its two sides are continuously fixedly connected to the outer side of the cylinder wall of the inner fabric cylinder 22 and the inner side of the cylinder wall of the outer fabric cylinder 21 by welding, riveting, etc. Through the spiral rising structure of the above-mentioned guide plate 23, a spiral reverse rising channel is formed between the wall of the inner cloth cylinder 22 and the wall of the outer cloth cylinder 21. The reverse rising channel can not only effectively rectify the flow direction of the slurry, thereby reducing the turbulence caused by the excessive flow velocity in the lower part of the outer cloth cylinder 21, but also because the upper and lower layers of the reverse rising channel are isolated from each other by the guide plate 23, the slurry and the flocs generated by the slurry flocculation can only rise in the reverse direction under the push of the slurry pump, thereby effectively avoiding the turbulence caused by the direct fall of large-volume flocs on the upper part of the outer cloth cylinder 21, and avoiding the occurrence of secondary dispersion of the flocs due to falling during the reverse rising process.

[0036] Furthermore, after the slurry rises along the reverse rising channel and enters the cloth inner cylinder 22, it will settle under the action of its own weight. At this time, the flocculated flocs in the slurry are of different sizes. Some flocs with too large a volume fall at a significantly faster rate than other flocs with smaller volumes. If they are not treated, they may cause an impact on the sedimentation layer below the cloth inner cylinder 22, affecting the stable settling effect. Therefore, it is necessary to try to ensure that the volume, weight and falling speed of the slurry flocs are consistent when they settle from the lower end of the cloth inner cylinder 22. For this reason, in some preferred embodiments of the present application, the feeding mechanism 2 also includes a bulk material structure 27, such as Figure 4 and Figure 5As shown, the bulking structure 27 comprises a hub 271, a dispersion disc, and a guide cone 273. The hub 271 is coaxially positioned below the inner distribution drum 22 and has a through hole for the thickener drive shaft. The dispersion disc comprises a plurality of blades 272 spaced apart around the central axis of the inner distribution drum 22. Each blade 272 is fixedly connected at both ends to the hub 271 and the wall of the inner distribution drum 22, respectively. Each blade 272 is tilted relative to the horizontal. In some preferred embodiments, the angle of attack of the blades 272 is 25° to 35°. In other preferred embodiments, the ratio of the angle between two opposing edges of adjacent blades to the angle between two oriented edges of adjacent blades is 1 / 3 to 1 / 2. These tilted blades 272, with gaps between them, allow the slurry containing flocs to fall downward in a fan-shaped, diffuse manner through the gaps between the blades 272. Excessively large flocs are dispersed through the gaps, further ensuring uniformity and consistency of the settled components. Furthermore, a guide cone 273 is provided below the dispersion disk to further disperse and distribute the slurry settled at the outlet of the distribution inner cylinder 22, so as to prevent the vertical fluid from directly impacting the sedimentation layer that has settled to the conical portion 12; specifically, the guide cone 273 is coaxially arranged with the distribution inner cylinder 22, and a through hole for the drive shaft 32 to pass through is provided on the axis. Its upper end is fixedly connected to the bottom end of the hub 271, and its bottom surface is lower than the cylinder bottom 26; in some preferred embodiments, the distance between the bottom surface of the guide cone 273 and the cylinder bottom 26 is greater than or equal to 15 cm and less than or equal to 20 cm; in some preferred embodiments, the bottom surface diameter of the guide cone 273 is greater than or equal to the inner diameter of the inner cylinder 22, and its cone angle ranges from 120° to 150°; in some preferred embodiments, in order to enhance the firmness of the connection, a support plate 275 for supporting the guide cone 273 can be provided below the bottom surface of the guide cone 273, and connected to the cylinder bottom 26 through a plurality of circumferentially distributed support rods 274.

[0037] In some specific embodiments, the feeding mechanism 2 further includes a drug adding port 28 , which is located on the feeding pipe 24 and is used for adding flocculants.

[0038] The present application also provides a thickener using the feeding mechanism 2 described in any of the above embodiments, such as Figure 5-Figure 7 As shown, the thickener includes a coaxially arranged tank body 1, a feeding mechanism 2, a driving mechanism 3 and a stirring mechanism 4.

[0039] Among them, the tank body 1 includes a straight cylindrical portion 11, a conical portion 12 and a collection barrel 13 coaxially arranged from top to bottom. The straight cylindrical portion 11 is surrounded by a circular side wall, the upper end of which is open, and the lower end is watertightly connected to the upper end of the conical portion 12. The conical portion 12 gradually shrinks from top to bottom and is finally watertightly connected to the top of the collection barrel 13. A through discharge port (not shown in the figure) is opened on the barrel wall of the collection barrel 13 for discharging the concentrated solid material.

[0040] Furthermore, an overflow trough 14 is provided at the top end of the straight cylindrical portion 11. The overflow trough 14 can be formed by bending the bottom and inner wall of the trough using the same plate, and directly using the straight cylindrical portion 11 as its outer wall, and is watertightly connected by welding or the like. At the same time, an overflow outlet (not shown in the figure) is opened on the overflow trough 14. The clarified liquid in the tank body 1 enters the overflow trough 14 as the liquid level rises, and is finally discharged through the overflow outlet.

[0041] The feeding mechanism 2 is arranged in the tank body 1, and its bottom end is lower than the top end of the tank body 1. It is used to introduce the slurry that needs to be separated into the tank body 1. It is connected to the extension pipe 7, and the external slurry is transported to the feeding mechanism 2 through the extension pipe 7.

[0042] The driving mechanism 3 is used to drive the stirring mechanism 4 to achieve the concentration of the solid components in the settled slurry. The driving mechanism 3 includes a motor 31 and a drive shaft 32. Preferably, the motor 31 is arranged above the feeding mechanism 2, and its motor shaft is fixedly connected to the drive shaft 32 and remains coaxial with the tank body 1. In some preferred embodiments, such as Figure 7 As shown, the drive shaft 32 passes through the feeding mechanism 2 and extends into the collecting bucket 13 .

[0043] The stirring mechanism 4 is arranged below the feeding mechanism 2 and rotates around the central axis of the tank body 1 under the drive shaft 32, thereby stirring the slurry at the bottom of the straight cylindrical portion 11 and scraping the solid material settled to the bottom of the conical portion 12 into the collecting barrel 13. Specifically, Figure 7 As shown, the stirring mechanism 4 includes a first rake rack 41 and a second rake rack 42 alternately distributed around the drive shaft 32, wherein the number of the first rake rack 41 and the second rake rack 42 are both two, and adjacent first rake racks 41 and second rake racks 42 are perpendicular to each other. In some other specific embodiments, the number of the first rake racks 41 and the second rake racks 42 can also be increased or decreased at the same time, for example, one, three, four or more first rake racks 41 and the same number of second rake racks 42.

[0044] Among them, the first rake frame 41 includes a first support structure 411 and a first reinforcement structure 412, wherein the first support structure 411 includes two radial support rods parallel to each other, and a plurality of cross rods connected between the two radial support rods, the radial support rods are fixedly connected to the drive shaft 32, extending radially outward from the central axis of the tank body 1, and tilting upward synchronously with the bottom of the tapered portion 12; accordingly, the first reinforcement structure 412 includes a radial reinforcement rod and a plurality of transverse reinforcement rods, the radial reinforcement rods are located above the radial support rods, fixedly connected to the drive shaft 32, extending radially outward from the central axis of the tank body 1 while gradually tilting downward, and finally fixedly connected to the cross rods, and the transverse reinforcement rods are fixedly connected to the radial support rods and the radial reinforcement rods at the same time, and a plurality of triangular support structures are formed through the above structure, thereby greatly enhancing the strength of the stirring mechanism 4. Furthermore, a plurality of first scrapers 413 are provided below the first support structure 411, and each first scraper 413 is connected to the two radial support rods of the first support structure 411 through a connecting piece, and the extension direction of the first scraper 413 forms a non-zero angle with the extension direction of the radial support rod. When the first support structure 411 rotates around the central axis of the tank body 1, the sediment can be gradually pushed toward the aggregate barrel 13.

[0045] The above describes in detail the specific implementation of the first support structure 411, the first reinforcement structure 412 and the first scraper 413. The second support structure 421, the second reinforcement structure 422, the second scraper 423 included in the second rake frame 42, and the second angles formed between the extension direction of the second scraper 423 and the extension direction of the second support structure can be implemented in the same or similar manner and will not be repeated here.

[0046] As the flocculated slurry settles downward from the bottom of the feed mechanism 2, the concentration of solid components in the tapered portion 12 varies. Areas closer to the central axis have a greater number of solid components, larger particle size, and heavier weight, while areas farther from the central axis have the opposite effect. Therefore, the lengths of the first rake 41 and the second rake 42 are further adjusted to better concentrate all settled solid material in the tapered portion 12 into the collection bucket 13. In some preferred embodiments, the radial length of the first rake 41 (specifically, represented by the radial distance between the outermost first scraper 413 and the central axis) is close to the inner diameter of the tank body 1, for example, greater than or equal to 0.95 times the inner diameter of the tank body 1, so that the outermost first scraper 413 is as close as possible to the junction of the tapered portion 12 and the straight cylindrical portion 11. The radial length of the second rake 42 (specifically, represented by the radial distance between the outermost second scraper 423 and the central axis) is less than the radial length of the first rake 41.

[0047] In some preferred embodiments, the diameter of the tank body 1 may be greater than or equal to 20m, and its bottom is supported and fixed by a bracket 6. The bracket 6 can be formed by connecting various horizontal and vertical matching connecting rods and other structures known to those skilled in the art. In addition, other forms of support such as plates and columns can also be used. The implementation method of the above-mentioned support structure is already known to those skilled in the art and will not be repeated here.

[0048] In some preferred embodiments, in order to facilitate the monitoring and maintenance of each unit of the thickener, as well as operations such as flocculant filling, a step ladder 51 is installed on the outer wall of the straight cylinder portion 11, and an inspection channel 52 is provided at the top of the straight cylinder portion 11. The inspection channel 52 can be entered through the step ladder 51, thereby realizing the inspection and maintenance of the equipment, as well as operations such as flocculant filling.

[0049] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An anti-overflow reverse feeding mechanism, comprising an outer cloth tube (21), an inner cloth tube (22), and a feeding pipe (24), wherein the outer cloth tube (21) is arranged outside the inner cloth tube (22), the top ends of the outer cloth tube (21) and the inner cloth tube (22) are both open structures, and the bottom ends are connected through the bottom (26) to form an annular channel, and the feeding pipe (24) is located at the lower part of the outer cloth tube (21), one end of which passes through the outer cloth tube (21) and is connected to the annular channel, characterized in that: The overflow prevention structure (25) is also included, which includes an overflow outer cylinder (251) and an overflow bottom plate (253). The overflow outer cylinder (251) surrounds the upper outer portion of the cloth outer cylinder (21), has an open top, and is connected to the cloth outer cylinder (21) at its bottom through the overflow bottom plate (253).

2. The anti-overflow reverse feeding mechanism according to claim 1, characterized in that: The lower portion of the overflow outer cylinder (251) is provided with a plurality of overflow ports (252) evenly arranged along the circumference of the cylinder wall.

3. The anti-overflow reverse feeding mechanism according to claim 1, characterized in that: The top end of the outer cloth cylinder (21) is higher than the top end of the inner cloth cylinder (22), and the top end of the overflow outer cylinder (251) is higher than the top end of the outer cloth cylinder (21).

4. The anti-overflow reverse feeding mechanism according to claim 1, characterized in that: The outer cloth cylinder (21), the inner cloth cylinder (22) and the overflow outer cylinder (251) are coaxially arranged.

5. The anti-overflow reverse feeding mechanism according to claim 1, characterized in that: The anti-overflow structure (25) further comprises a plurality of reinforcing connecting rods (254) which are evenly arranged along the circumferential direction between the outer cloth cylinder (21) and the overflow outer cylinder (251), and the two ends of each reinforcing connecting rod (254) are respectively fixedly connected to the outer side wall of the outer cloth cylinder (21) and the inner side wall of the overflow outer cylinder (251).

6. A thickener, characterized in that: It comprises a tank body (1), a driving mechanism (3), a stirring mechanism (4), and a feeding mechanism (2) according to any one of claims 1 to 5; The feeding mechanism (2) is coaxially arranged on the upper part of the tank body (1), and its bottom end is lower than the top end of the tank body (1); The driving mechanism (3) comprises a motor (31) and a driving shaft (32); the motor (31) is arranged above the feeding mechanism (2); the driving shaft (32) is coaxially arranged with the tank body (1); the upper end of the driving shaft is fixedly connected to the motor shaft of the motor (31); and the lower end of the driving shaft passes through the feeding mechanism (2) and is connected to the stirring mechanism (4) located below the driving mechanism (3).

7. The thickener according to claim 6, characterized in that The tank body (1) comprises a straight cylindrical portion (11), a tapered portion (12) and a collecting bucket (13) coaxially arranged from top to bottom; An overflow trough (14) is provided at the top end of the straight cylindrical portion (11), and an overflow outlet is provided on the overflow trough (14) for discharging the clarified liquid in the upper portion of the tank body (1); The collecting barrel (13) is provided with a discharge port for discharging the concentrated solid material from the lower part of the tank body (1).

8. The thickener according to claim 7, wherein: The stirring mechanism (4) comprises a first rake (41) and a second rake (42) alternately arranged along the driving shaft (32), wherein the radial length of the first rake (41) is greater than the radial length of the second rake (42).

9. The thickener according to claim 8, characterized in that The first rake frame (41) includes a first support structure (411) which is fixedly connected to the drive shaft (32) and extends radially outward along the axis of the tank body (1) while being tilted upward synchronously with the bottom of the tapered portion (12); a plurality of first scrapers (413) are provided below the first support structure (411); The second rake frame (42) includes a second support structure (421) which is fixedly connected to the drive shaft (32) and extends radially outward along the axis of the tank body (1) while being tilted upward synchronously with the bottom of the tapered portion (12); a plurality of second scrapers (423) are provided below the second support structure (421); The radial distance of the first support structure (411) is greater than the radial distance of the second support structure (421).

10. The thickener according to claim 9, characterized in that The extension direction of the first scraper (413) forms a non-zero angle with the extension direction of the first support structure (411); the extension direction of the second scraper (423) forms a non-zero angle with the extension direction of the second support structure (421).

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