A bottomless rake radial thickener

Abstract

The application provides a bottomless rake radial thickener, which comprises a settling tank, an opening is arranged at the top of the settling tank, the bottom of the settling tank is horizontally arranged, a bridge frame is arranged at the upper end of the settling tank, a central pipe is arranged between the bridge frame and the bottom of the settling tank, the central pipe rotates between the settling tank and the bridge frame, a suction nozzle is fixedly connected to the outer wall of the central pipe, the suction nozzle is located close to the bottom of the settling tank, a predetermined gap is formed between the suction nozzle and the inner bottom wall of the settling tank, and the first end of the suction nozzle is located between the central pipe and the inner wall of the settling tank and extends to the two sides. The application effectively solves the problem of rake pressing in the process of operation of the traditional thickener.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, and in particular to a bottomless rake-spoke thickener. Background Technology

[0002] A thickener is a large solid-liquid separation device commonly found in mineral processing plants. Currently, thickeners come in several forms, including horizontal flow, radial flow, vertical, and inclined plate. Most use mechanical methods to concentrate sludge into a conical funnel, or use multiple funnels without mechanical means to discharge the sludge out of the tank using static pressure. However, the conical funnel occupies a certain height, increasing infrastructure costs. At the same time, mechanical sludge discharge often results in rake accidents due to operational reasons, affecting the normal operation of the thickener.

[0003] There is also domestic research on the rake direction of thickeners. Among them, patent literature: a thickener (publication number: CN112619209A) is provided with guides, connectors and other related components. The guides slide along the main frame, and the connectors retract upwards during the sliding process. This can control the rake arm to engage along the main frame, so that the rake arm can move in the wastewater, which can effectively reduce the resistance of the rake arm and avoid the occurrence of rake failure. However, the technical solution of this patent literature requires the adjustment of the rake arm through guides and other components. Large thickener sedimentation tanks are huge, and the above-mentioned mechanical control of the rake arm is difficult to control. Moreover, the above components are immersed in the sedimentation tank for a long time, and their connection parts are prone to blockage. In addition, the connection points have certain requirements for corrosion resistance. The above solution is difficult to implement in the actual production process. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a bottomless rake-spoke thickener, which effectively solves the rake pressing problem that occurs during the operation of traditional thickeners.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A bottomless rake-type thickener includes a settling tank with an opening at the top and a horizontally positioned bottom. A bridge is installed at the top of the settling tank, and a central pipe is positioned between the bridge and the bottom of the settling tank. The central pipe rotates between the settling tank and the bridge. A suction nozzle is fixedly connected to the outer wall of the central pipe, located near the bottom of the settling tank. A predetermined gap exists between the suction nozzle and the inner bottom wall of the settling tank. The first end of the suction nozzle is located between the central pipe and the inner wall of the settling tank and extends to both sides. The second end of the suction nozzle is connected to the central pipe via a first end delivery pipe, the end of which is connected to a negative pressure element. By setting the bottom of the settling tank horizontally, the height of the settling tank can be reduced, the construction cost of the settling tank can be lowered, and by using the suction nozzle instead of a cleaning rake, the sludge inside the settling tank can be effectively absorbed and discharged, improving the efficiency of sludge removal and avoiding the traditional rake pressing phenomenon.

[0007] Preferably, the suction nozzle is in the shape of a straight fan, and there are two suction nozzles. The two suction nozzles are symmetrically distributed around the center of the central tube. There is a predetermined distance between the first end and the second end of the suction nozzle. The above arrangement can ensure that the suction nozzle can effectively suck up the sludge, and the two suction nozzles can improve the efficiency and stability of sludge suction.

[0008] Preferably, the sedimentation tank is equipped with a material distribution assembly, which includes a nozzle. The nozzle is fan-shaped and is fixed to the outer wall of the central tube. The nozzle is located at a predetermined position above the suction nozzle. The first end of the nozzle is horizontally positioned between the central tube and the inner wall of the sedimentation tank. The first end of the nozzle extends to both sides. The second end of the nozzle is connected to a second end conveying pipe. By setting the above components, the material distribution can be ensured to be uniform, and all parts of the suction nozzle can generate consistent suction force, ensuring the normal suction of sludge.

[0009] Preferably, the first end of the nozzle has a spray port, and the first end of the suction nozzle has a suction port. The spray port and the suction port are arranged in opposite directions. Setting the nozzle and the suction nozzle in opposite directions ensures that the torque generated is in the same direction, which can ensure that the central tube rotates normally to complete the sludge discharge and material distribution, thereby improving the settling efficiency.

[0010] Preferably, an inclined plate is fixedly connected to the outer wall of the central tube. The inclined plate is installed at a predetermined angle and is located at a predetermined position above the suction nozzle. The end of the inclined plate extends towards the inner wall of the sedimentation tank. By setting the inclined plate, the sedimentation efficiency of particulate matter in the sedimentation tank can be further improved.

[0011] Preferably, a chute is fixedly connected to the outer wall of the top of the sedimentation tank. The chute is annular, and a collection channel is opened at the top of the chute. Several toothed openings are opened between the inner wall of the chute and the outer wall of the sedimentation tank.

[0012] Preferably, a flapper is fixedly connected to the outer wall of the central tube. The flapper is in the shape of a straight fan. The first end of the flapper extends toward the inner wall of the sedimentation tank and has a flap opening. The second end of the flapper is connected to a third end conveying pipe. The flapper is located at the top of the sedimentation tank and corresponds to the position of the tooth opening. By setting the above components, the scum at the top of the sedimentation tank can be skimmed off, ensuring the purity of the clear liquid.

[0013] Preferably, the side wall of the cable tray is provided with a drive assembly for rotating the central tube, and the drive assembly is connected to an electronic control device.

[0014] Preferably, a sealing connector is installed on the side wall of the cable tray, the central tube is installed at the lower end of the sealing connector, and a first intermediate conveying pipe, a second intermediate conveying pipe and a third intermediate conveying pipe are sequentially arranged on the inner wall of the central tube. The first intermediate conveying pipe, the second intermediate conveying pipe and the third intermediate conveying pipe are all installed at the lower end of the sealing connector and are connected thereto. The upper end of the sealing connector is connected to a sludge discharge pipe, a liquid inlet pipe and a slag skimmer.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. Compared with the existing rake design, replacing the cleaning rake with a suction nozzle avoids frequent rake-over accidents caused by operation, ensuring the normal operation of the entire equipment and improving the efficiency of waste liquid sedimentation. The suction nozzle allows the bottom of the sedimentation tank to be horizontal, eliminating the need for a conical bottom, thus reducing the overall height of the sedimentation tank, lowering construction difficulty and costs, and improving sludge removal efficiency while saving sedimentation costs. Furthermore, the suction nozzle's inlet direction is opposite to the nozzle's outlet direction, ensuring the central tube rotates normally. During the central tube's rotation, material distribution, sludge removal, and skimming can be carried out simultaneously, further improving the efficiency of waste liquid sedimentation.

[0017] 2. By incorporating components such as nozzles and a second-end conveying pipe, uniform material distribution is achieved, ensuring that the sludge is evenly distributed at the bottom of the settling tank. This works in conjunction with the suction nozzle to generate sufficient negative pressure at all points of the nozzle opening to expel the sludge. The flat nozzle design ensures sufficient suction force for proper sludge discharge. The inclined plate, positioned above the nozzle, divides the settling tank into upper and lower sections, accelerating the settling of solid particles and increasing the settling rate, thus speeding up the sludge discharge process. Furthermore, the skimming nozzle and third-end conveying pipe allow for the skimming of scum from the top of the settling tank, ensuring the purity and quality of the clear liquid flowing into the chute. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a top view of the structure of the present invention;

[0020] Figure 3 This is a side view of the structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure along line AA of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the central tube of the present invention.

[0023] In the diagram: 1. Settling tank; 101. Sluice box; 1011. Collection channel; 102. Toothed inlet; 2. Suction nozzle; 201. First end conveying pipe; 202. First intermediate conveying pipe; 203. Sludge discharge pipe; 3. Nozzle; 301. Second end conveying pipe; 302. Second intermediate conveying pipe; 303. Liquid inlet pipe; 4. Inclined plate; 5. Skimming nozzle; 501. Third end conveying pipe; 502. Third intermediate conveying pipe; 503. Sludge skimming pipe; 6. Cable tray; 701. Electrical control device; 702. Drive assembly; 8. Sealing connector; 9. Central pipe. Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Reference Figure 1-5A bottomless rake-shaped thickener includes a settling tank 1 with an opening at the top and a horizontal bottom. Changing the bottom of the settling tank 1 from a conical shape to a horizontal shape reduces the height of the settling tank 1 and lowers its construction cost. A cable tray 6 is installed at the top of the settling tank 1, and a central pipe 9 is installed between the cable tray 6 and the bottom of the settling tank 1. The central pipe 9 rotates between the settling tank 1 and the cable tray 6. A truncated cone is installed at the bottom of the settling tank 1, and the central pipe 9 is installed on the truncated cone and rotatably connected to it. The design of the truncated cone ensures the stability of the central pipe 9 and allows the sludge settling downwards to slide down the surface of the truncated cone, preventing long-term accumulation and the inability to clean it.

[0026] A suction nozzle 2 is fixedly connected to the outer wall of the central tube 9. The suction nozzle 2 is located near the bottom of the sedimentation tank 1, and there is a predetermined gap between the suction nozzle 2 and the inner bottom wall of the sedimentation tank 1. The first end of the suction nozzle 2 is located between the central tube 9 and the inner wall of the sedimentation tank 1 and extends to both sides. The two ends of the suction nozzle 2 are located between the central tube 9 and the sedimentation tank 1. This configuration of the suction nozzle 2 allows it to absorb a larger area of ​​sludge during the rotation process at the bottom of the sedimentation tank 1, preventing the sludge from becoming difficult to clean in certain areas at the bottom of the sedimentation tank 1. The second end of the suction nozzle 2... The end and the central pipe 9 are connected by a first end conveying pipe 201. The end of the first end conveying pipe 201 is connected to a negative pressure element. The suction nozzle 2 can discharge the sludge at the bottom of the sedimentation tank 1. The suction nozzle 2 is designed as a flat suction nozzle and is manufactured according to the principle of high resistance distribution. The opening ratio of the suction nozzle 2 is made according to the standard. When the fluid velocity in front of the suction nozzle 2 reaches a certain velocity, according to the principle of conservation of momentum, the fluid gives the suction nozzle 2 a certain reaction force to make it move forward and rotate. This scheme requires uniform material distribution along the bottom of the tank to ensure stable sludge concentration.

[0027] Preferably, the suction nozzle 2 is shaped like a straight fan. Two suction nozzles 2 can be configured, symmetrically distributed around the center tube 9. The two suction nozzles 2 are symmetrically distributed and their suction direction for sludge is consistent. This can improve the sludge suction rate of the suction nozzle 2 while ensuring the stability of the suction nozzle 2 and the center tube 9 during rotation, thus improving the stability of the entire device and ensuring that the sludge can be discharged normally and stably. There is a predetermined distance between the first end and the second end of the suction nozzle 2. This predetermined distance ensures the consistency of the sludge flow rate at each position of the first end of the suction nozzle 2, ensuring that the sludge at each position is cleaned consistently.

[0028] To ensure uniform material distribution at the bottom of the settling tank 1, a material distribution assembly is installed inside the settling tank 1. The material distribution assembly includes a nozzle 3, which is a straight fan shape. The nozzle 3 is designed in the same way as the suction nozzle 2. The nozzle 3 is installed and fixed on the outer wall of the central tube 9. The nozzle 3 is located at a predetermined position above the suction nozzle 2. The first end of the nozzle 3 is horizontally positioned between the central tube 9 and the inner wall of the settling tank 1. The first end of the nozzle 3 extends to both sides. The second end of the nozzle 3 is connected to a second end conveying pipe 301. The second end conveying pipe 301 is connected to a conveying assembly. The solid-liquid mixture to be treated is sprayed into the settling tank 1 through the second end conveying pipe 301 and the nozzle 3. The nozzle 3 is located above the suction nozzle 2. The sprayed solid-liquid mixture can settle towards the bottom of the settling tank 1 under the action of gravity. The nozzle 3 distributes the material while rotating, which can ensure the uniform distribution of sludge at the bottom of the settling tank 1 and facilitate the suction nozzle 2 to discharge the sludge under negative pressure.

[0029] A nozzle is provided at the first end of the nozzle 3, and a suction port is provided at the first end of the suction nozzle 2. The nozzle and suction port are arranged in opposite directions. The cloth-discharging nozzle 3 and the mud-discharging suction nozzle 2 rotate together along the central tube, and their flow directions are opposite. The thrust of the reverse fluid to the central tube 9 is in the same direction as the suction force of the mud-discharging suction nozzle 2, which increases the rotational torque. The above arrangement can ensure that the central tube 9 and related components can rotate normally, and ensure the normal operation of mud suction and cloth distribution.

[0030] It should be noted that since the uniformly distributed material does not have a central swirling mixing cylinder, an inlet and outlet reverse spiral mixing pipe is added outside the pool. The flocculant is added through this pipe, and the reaction time is ten seconds before it enters the pool. The reaction in the pipe is more complete than that in the central mixing cylinder, which can save flocculant and reduce settling costs.

[0031] An inclined plate 4 is fixedly connected to the outer wall of the central tube 9. The inclined plate 4 is installed at a predetermined angle and is located at a predetermined position above the suction nozzle 2. The end of the inclined plate 4 extends towards the inner wall of the sedimentation tank 1. A straight rotating inclined plate is arranged above and behind the cloth nozzle. The floating particles will settle on the slowly moving inclined plate 4 and finally slide to the bottom of the tank. During the upward movement of the particles below the inclined plate 4, the particles rebound and fall to the bottom of the sedimentation tank 1 due to the obstruction of the inclined plate 4. Compared with the traditional fixed inclined plate 4, the rotating inclined plate 4 reduces the sedimentation time and can improve efficiency by 60%.

[0032] Based on the energy conservation law of Bernoulli's equation and the impulse conservation law of velocity change, the fluid gravity generates a rotational torque on the central tube 9, causing it to spin. The resistance generated by the rotation of the inclined plate 4 at low speed is proportional to the speed. In the design, the vertical component of the force generated by the rising fluid on the inclined plate 4 is in the same direction as the rotation, thus offsetting the rotational resistance. It should be noted that the medium sprayed from the nozzle 3 can flow in the sedimentation tank 1. The flow direction of the medium is upward. After the flowing medium moves upward, it can contact the inclined plate 4. The inclined plate 4 can block the particulate matter in the medium, accelerating the sedimentation of the particulate matter. On the other hand, the upward flow of the medium can generate a force on the inclined plate 4. The force can be decomposed into vertical and horizontal directions. The horizontal force can drive the inclined plate to rotate. The design is that the direction of the inclined plate rotation is consistent with the direction of the central tube 9 rotation, which can drive the central tube 9 to rotate synchronously and reduce losses.

[0033] A chute 101 is fixedly connected to the outer wall of the top of the sedimentation tank 1. The chute 101 is annular, and a collection channel 1011 is opened at the top of the chute 101. Several teeth 102 are opened between the inner wall of the chute 101 and the outer wall of the sedimentation tank 1. The teeth 102 are distributed around the circumference of the sedimentation tank 1. The clear liquid is located at the top of the sedimentation tank 1 and flows from the teeth 102 into the collection channel 1011, and finally is discharged from the chute 101, thus realizing the separation of the clear liquid. The teeth 102 are evenly arranged along the top of the sedimentation tank 1 to ensure that the clear liquid flows out evenly from all sides of the top of the sedimentation tank 1, thereby increasing the flow rate of the clear liquid.

[0034] During the actual settling process, some scum will move along with the clear liquid and float to the surface. To solve this problem, a skimmer 5 is fixedly connected to the outer wall of the central pipe 9. The skimmer 5 is a straight fan shape. The first end of the skimmer 5 extends towards the inner wall of the settling tank 1 and has a flared opening. The second end of the skimmer 5 is connected to the third end conveying pipe 501. The skimmer 5 is located at the top of the settling tank 1 and corresponds to the position of the toothed opening 102. The design of the skimmer 5 is similar to that of the suction nozzle 2 and the nozzle 3. It extends towards the inner wall of the settling tank 1 and can cover most of the top area. Its position is opposite to the position of the toothed opening 102. The position of the skimmer 5 is exactly flush with the position of the scum, ensuring that the scum is properly skimmed off.

[0035] Ideally, rotation can be generated spontaneously using the potential energy produced by the gravity of the fluid. However, considering that water has a very low viscosity and the small intermolecular frictional force results in a small reaction force, and that the mechanical seal generates a certain frictional resistance, an electric rotary mechanism is still needed to force the mechanism to operate. The design torque is sufficient to overcome the frictional resistance generated by the mechanical seal. Therefore, a drive assembly 702 for driving the rotation of the central tube 9 is provided on the side wall of the cable tray 6. The drive assembly 702 is connected to an electrical control device 701. The drive assembly can be a common belt conveyor mechanism to drive the central tube 9 to rotate in a specific direction.

[0036] As one of the preferred methods for skimming, sludge suction, and liquid inlet, a sealing connector 8 is installed on the side wall of the bridge frame 6. A central tube 9 is installed at the lower end of the sealing connector 8. The inner wall of the central tube 9 is sequentially provided with a first intermediate conveying pipe 202, a second intermediate conveying pipe 302, and a third intermediate conveying pipe 502. The third intermediate conveying pipe 502 is sleeved outside the second intermediate conveying pipe 302, and the second intermediate conveying pipe 302 is sleeved outside the first intermediate conveying pipe 202. The third end conveying pipe 501, the second end conveying pipe 301, and the first end conveying pipe 201 are respectively connected to it. The first intermediate conveying pipe 202, the second intermediate conveying pipe 302, and the third intermediate conveying pipe 502 are all installed at the lower end of the sealing connector 8. Connected to it, the upper end of the sealing connector 8 is connected to a sludge discharge pipe 203, a liquid inlet pipe 303, and a scum skimming pipe 503. The movement direction of the sludge at the bottom of the sedimentation tank 1 is sequentially: suction nozzle 2, first end conveying pipe 201, first intermediate conveying pipe 202, sludge discharge pipe 203; the conveying direction of the feed is sequentially: liquid inlet pipe 303, second intermediate conveying pipe 302, second end conveying pipe 301, nozzle 3; and the conveying direction of the scum is sequentially: skimming nozzle 5, third end conveying pipe 501, third intermediate conveying pipe 502, scum skimming pipe 503. During the movement, the sludge discharge, liquid inlet, and scum skimming processes can be completed simultaneously through the above-mentioned arrangement. The sealing connector 8 is an existing structure that can connect the rotating end and the stationary end and ensure the normal transport of materials.

[0037] Finally, it should be noted that, with the sedimentation tank 1 designed to be six meters high, the height of the suction nozzle 2 should be within 50 cm from the bottom, the distance of the nozzle 3 from the bottom should ideally be 120 cm, and the distance of the inclined plate 4 from the bottom should ideally be 150 cm. Furthermore, the suction nozzle 2, nozzle 3, and skimmer 5 are all shown in the diagram as components that are fixed to the outside of the installation fixture 9. Various installation fixtures can be selected to ensure the stability of the suction nozzle 2, nozzle 3, and skimmer 5 during rotation, although these are not shown in the diagram. The shapes of the suction nozzle 2, nozzle 3, and skimmer 5 should be designed according to a predetermined shape to reduce resistance during rotation. The front end of the rotating component should be narrower, and the rear end should be larger than the front end, with a continuous transition surface between the front and rear ends. During rotation, the front end first contacts the medium in the sedimentation tank 1. This design reduces the flow resistance of the suction nozzle 2, nozzle 3, and skimmer 5 within the sedimentation tank 1, ensuring normal equipment operation.

[0038] In the operation of this invention, when it is necessary to clean the sludge at the bottom of the sedimentation tank 1, the negative pressure or siphon effect generated at the end of the first end conveying pipe 201 creates a negative pressure at the first end of the suction nozzle 2. The sludge at the bottom of the sedimentation tank 1 can be absorbed and cleaned through the suction nozzle 2. Theoretically, the negative pressure generated at the suction nozzle 2 can absorb the sludge and exert a force on the suction nozzle 2, causing it to move synchronously. The suction nozzle 2 processes the sludge at the bottom of the sedimentation tank 1 while rotating around the central pipe 9. In actual operation, the central pipe 9 is driven to move in a directional manner by the electronic control device 701 and the drive component 702, which can overcome resistance and drive the suction nozzle 2 to move in a directional manner at a predetermined speed to complete the cleaning of the sludge at the bottom of the sedimentation tank 1. The above-mentioned setup can effectively avoid the occurrence of the rake phenomenon, and the bottom of the sedimentation tank 1 is set to be flat, which can reduce the height and difficulty of constructing the sedimentation tank 1, reduce manufacturing costs, and improve production efficiency.

[0039] Furthermore, during the rotation of the central tube 9, the material can be distributed through the second end conveying pipe 301 and nozzle 3, etc., to distribute the solid-liquid mixture that needs to be settled from the outside. The mixture is sprayed out from the nozzle 3. Most of the solid matter settles towards the bottom of the settling tank 1 under the action of gravity. Some of the solid matter moves downward after being blocked by the lower side wall of the inclined plate 4 during the upward movement. By setting the inclined plate 4, the settling of the solid-liquid mixture in the settling tank 1 can be accelerated, and the settling rate can be increased. In addition, the solid particles located above the inclined plate 4 can fall onto the upper surface of the inclined plate 4 during the settling process, and can slide down the inclined plate 4, which helps the solid particles at the top to settle quickly.

[0040] Furthermore, the nozzle 3 is positioned in the opposite direction to the suction nozzle 2, allowing them to operate synchronously. The forces acting on them are in opposite directions, which enhances the rotational capability of the central tube 9 and ensures that the central tube 9 can rotate smoothly and directionally within the sedimentation tank 1.

[0041] The turbid liquid after sedimentation is discharged from the suction nozzle 2, and the clear liquid after sedimentation flows from the top toothed opening 102 of the sedimentation tank 1 into the sluice 101, thus separating the turbid liquid and the clear liquid. By setting the skimmer 5, which is located at the top of the sedimentation tank 1 opposite to the toothed opening 102, it can treat some of the scum at the top of the sedimentation tank 1, preventing it from flowing into the sluice 101 and ensuring the purity of the clear liquid.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bottomless rake-spoke thickener, comprising a settling tank (1), wherein the top of the settling tank (1) is provided with an opening, and the bottom of the settling tank (1) is horizontally arranged, characterized in that: A cable tray (6) is installed at the upper end of the sedimentation tank (1). A central tube (9) is provided between the cable tray (6) and the bottom of the sedimentation tank (1). The central tube (9) rotates between the sedimentation tank (1) and the cable tray (6). A suction nozzle (2) is fixedly connected to the outer wall of the central tube (9). The suction nozzle (2) is located near the bottom of the sedimentation tank (1). There is a predetermined gap between the suction nozzle (2) and the inner bottom wall of the sedimentation tank (1). The first end of the suction nozzle (2) is located between the central tube (9) and the inner wall of the sedimentation tank (1) and extends to both sides. The second end of the suction nozzle (2) is connected to the central tube (9) through a first end delivery pipe (201). The end of the first end delivery pipe (201) is connected to a negative pressure element. The settling tank (1) is equipped with a fabric assembly, which includes a nozzle (3). The nozzle (3) is in the shape of a fan and is fixed to the outer wall of the central tube (9). The nozzle (3) is located at a predetermined position above the suction nozzle (2). The first end of the nozzle (3) is horizontally positioned between the central tube (9) and the inner wall of the settling tank (1). The first end of the nozzle (3) extends to both sides. The second end of the nozzle (3) is connected to a second end delivery pipe (301). The nozzle (3) has a spray port at its first end, and the suction nozzle (2) has a suction port at its first end. The spray port and the suction port are arranged in opposite directions. The sedimentation tank (1) has a chute (101) fixedly connected to the outer wall at the top. The chute (101) is annular and has a collection channel (1011) at the top. There are several toothed openings (102) between the inner wall of the chute (101) and the outer wall of the sedimentation tank (1). The outer wall of the central tube (9) is fixedly connected to a flared nozzle (5). The flared nozzle (5) is a straight fan shape. The first end of the flared nozzle (5) extends toward the inner wall of the sedimentation tank (1). The first end of the flared nozzle (5) has a flared opening. The second end of the flared nozzle (5) is connected to a third end conveying pipe (501). The flared nozzle (5) is located at the top of the sedimentation tank (1) and corresponds to the position of the toothed opening (102).

2. The bottomless rake-spoke thickener according to claim 1, characterized in that, The suction nozzle (2) is in the shape of a fan. There are two suction nozzles (2), which are symmetrically distributed around the center tube (9). There is a predetermined distance between the first end and the second end of the suction nozzle (2).

3. A bottomless rake-spoke thickener according to claim 1, characterized in that, An inclined plate (4) is fixedly connected to the outer wall of the central tube (9). The inclined plate (4) is installed at a predetermined angle and is located at a predetermined position above the suction nozzle (2). The end of the inclined plate (4) extends toward the inner wall of the sedimentation tank (1).

4. A bottomless rake-spoke thickener according to claim 1, characterized in that, The side wall of the bridge (6) is provided with a drive assembly (702) for rotating the central tube (9), and the drive assembly (702) is connected to an electronic control device (701).

5. A bottomless rake-spoke thickener according to any one of claims 1-4, characterized in that, The bridge frame (6) is equipped with a sealing connector (8) on its side wall. The central tube (9) is installed at the lower end of the sealing connector (8). The inner wall of the central tube (9) is provided with a first intermediate conveying pipe (202), a second intermediate conveying pipe (302) and a third intermediate conveying pipe (502) in sequence. The first intermediate conveying pipe (202), the second intermediate conveying pipe (302) and the third intermediate conveying pipe (502) are all installed at the lower end of the sealing connector (8) and are connected to it. The upper end of the sealing connector (8) is connected to a sludge discharge pipe (203), a liquid inlet pipe (303) and a slag skimmer (503).

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