A thickener stirring shaft for preventing thickener rake and making underflow uniform

Abstract

The utility model discloses a kind of for preventing thickener press harrow and make the uniformity of underflow thickener stirring shaft.The thickener stirring shaft is installed in thickener interior, is thickener main shaft;The thickener stirring shaft includes the mud layer lifting and stirring part for lifting and stirring mud layer of thickener bottom, which is arranged in the lower part of thickener stirring shaft, and slurry separation part for dispersing slurry lifted by mud layer lifting and stirring part, which is arranged in the upper part of thickener stirring shaft.The utility model is simple in structure, effect is remarkable, can effectively improve the working stability and efficiency of thickener.

Description

Technical Field

[0001] This utility model relates to the technical field of stirring and separating equipment in mineral processing, chemical industry, environmental protection and other fields, and specifically to a thickener stirring shaft for preventing thickener rake and ensuring uniform underflow. Background Technology

[0002] A thickener is a key piece of equipment for solid-liquid separation based on the principle of gravity sedimentation, widely used in the concentration and clarification processes of various mineral slurries, chemical products, and industrial wastewater. Its basic working principle is as follows: the slurry to be treated is fed into the center of the thickener; solid particles gradually settle to the bottom of the equipment under gravity, forming a high-concentration sludge layer (underflow), while clarified overflow water forms at the top. The underflow is discharged through the bottom discharge port, while the overflow flows out through the top overflow weir. During the operation of thickeners, two core problems have consistently plagued the industry: "rake" failure and uneven underflow concentration. Regarding "rake" failure: thickeners are typically equipped with a rake driven by the main shaft, whose function is to slowly scrape the sediment (sludge layer) settled at the bottom towards the central discharge port. However, when the feed concentration or flow rate fluctuates, or when the sludge layer is too dense and viscous due to poor flocculation, the torque acting on the rake increases sharply. When the torque exceeds the set safety value of the drive system, the drive system will activate overload protection (such as raising the rake frame or stopping the machine) to protect the equipment, resulting in a so-called "rake crush" accident. Rake crush leads to production interruption, requiring a large amount of manpower and time for cleaning and restoration, seriously affecting production efficiency and equipment safety. Regarding the non-uniformity of underflow concentration: An ideal thickener should be able to discharge underflow with a stable and uniform concentration. However, in actual operation, due to the existence of sedimentation dead zones or channeling phenomena in the mud layer at the bottom of the thickener, the underflow concentration fluctuates greatly in different areas and at different times. Too low a concentration will increase the load on subsequent processing steps, while too high a concentration may lead to pipeline blockage. This non-uniformity makes the control of the entire process flow difficult, affecting the quality and recovery rate of the final product. In the prior art, the methods commonly used to solve the above problems include: optimizing the structure of the rake frame (such as increasing the number of rake arms, changing the scraper angle), improving the method and type of flocculant addition, or installing a torque monitoring system for early warning. However, most of these methods rely on external parameter control or passive response, failing to fundamentally improve the flow state of the slurry and the physical properties of the mud layer inside the thickener. Therefore, there is an urgent need for an innovative solution that can proactively intervene in the mud layer state by addressing the internal structure of the thickener, achieving uniform mixing and stable discharge, thereby fundamentally reducing the risk of rake damage and improving the uniformity of underflow quality. Utility Model Content

[0003] The present invention aims to improve upon prior designs to overcome their shortcomings and defects, and provides a thickener stirring shaft for preventing thickener rakes and ensuring uniform underflow.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: The thickener stirring shaft, used to prevent the thickener from pressing down and to ensure the uniformity of the underflow, is installed inside the thickener and serves as the thickener's main shaft. The thickener stirring shaft includes a mud layer lifting and stirring section located at the lower part of the thickener stirring shaft for lifting and stirring the mud layer at the bottom of the thickener, and a slurry separation section located at the upper part of the thickener stirring shaft for dispersing the slurry lifted up by the mud layer lifting and stirring section.

[0005] Preferably, the mud layer lifting and stirring section includes at least one set of auger spiral blades (1) disposed at the lower part of the thickener stirring shaft.

[0006] More preferably, the auger spiral blade (1) is a segmented spiral stirring blade or a whole-section spiral stirring blade.

[0007] More preferably, the pitch of the screw conveyor blade (1) gradually increases from bottom to top.

[0008] More preferably, the edge of the auger spiral blade (1) is provided with a wear-resistant alloy layer.

[0009] Preferably, the slurry separation section is an inverted cone (2) fitted onto the upper part of the thickener's stirring shaft.

[0010] More preferably, the inverted cone (2) is fixedly connected to the thickener stirring shaft.

[0011] More preferably, the inverted cone (2) is provided with a through hole.

[0012] More preferably, the bottom end of the thickener's stirring shaft is connected to a rake arm (3), and a water guide rod (4) is provided on the rake arm (3).

[0013] This utility model also provides a thickener, wherein the thickener is provided with the aforementioned thickener stirring shaft for preventing thickener rake and for ensuring uniform underflow.

[0014] The present invention will be further described below: This stirring shaft consists of two main parts: The mixing shaft described in this invention for preventing thickener rake damage and improving underflow uniformity includes a mud layer lifting and mixing section and a slurry separation section. The mud layer lifting and mixing section is located at the lower part of the thickener mixing shaft. Its core function is that, as the thickener mixing shaft drives the rake frame to rotate, the auger blades rotate along with the main shaft, thereby lifting the mud layer at the bottom of the thickener. This effectively reduces the pressure at the bottom of the thickener, and the high-concentration slurry at the bottom mixes with the lower-concentration mud layer at the top through the auger blades, ensuring uniformity of the output concentration. Simultaneously, the design of the auger blades also achieves uniform mixing of the underflow, preventing localized mud deposition at the bottom, ensuring the stability of the underflow concentration, and reducing rake damage failures.

[0015] The slurry separation section is located on the upper part of the thickener's agitator shaft and is typically an inverted cone shape. When the mud layer lifting and agitating section lifts the slurry to the upper part of the thickener's agitator shaft, the slurry easily adheres to the shaft. The inverted cone structure disperses the slurry adsorbed on the shaft, allowing it to re-enter the thickener chamber by gravity, effectively preventing slurry accumulation on the shaft. This design promotes slurry circulation within the thickener, resulting in a more uniform distribution of solid particles and improving the uniformity of the underflow concentration. Furthermore, the inverted cone shape optimizes the slurry flow path, reduces the energy consumption increase due to bottom pressure buildup, and improves the overall efficiency of the agitator shaft.

[0016] In summary, this utility model has a simple structure and significant effects, and can effectively improve the working stability and efficiency of the thickener. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of another embodiment of the present invention.

[0018] In the diagram: 1. Screwdriver blades; 2. Inverted cone; 3. Rake arm; 4. Water guide rod. Detailed Implementation Example 1

[0019] See Figure 1 The thickener stirring shaft, used to prevent the thickener from pressing down and to ensure the uniformity of the underflow, is installed inside the thickener and is the main shaft of the thickener. The thickener stirring shaft includes a mud layer lifting and stirring section located at the lower part of the thickener stirring shaft for lifting and stirring the mud layer at the bottom of the thickener, and a slurry separation section located at the upper part of the thickener stirring shaft for dispersing the slurry lifted up by the mud layer lifting and stirring section.

[0020] The sludge lifting and mixing section includes at least one set of auger spiral blades 1 disposed at the lower part of the thickener's mixing shaft. The auger spiral blades 1 are segmented spiral mixing blades. The pitch of the auger spiral blades 1 gradually increases from bottom to top. A wear-resistant alloy layer is provided on the edge of the auger spiral blades 1. The slurry separation section is an inverted cone 2 sleeved on the upper part of the thickener's mixing shaft. The inverted cone 2 is fixedly connected to the thickener's mixing shaft. A through hole is provided on the inverted cone 2. A rake arm 3 is connected to the bottom end of the thickener's mixing shaft, and a water guide rod 4 is provided on the rake arm 3. Example 2

[0021] See Figure 2 The thickener stirring shaft, used to prevent the thickener from pressing down and to ensure the uniformity of the underflow, is installed inside the thickener and is the main shaft of the thickener. The thickener stirring shaft includes a mud layer lifting and stirring section located at the lower part of the thickener stirring shaft for lifting and stirring the mud layer at the bottom of the thickener, and a slurry separation section located at the upper part of the thickener stirring shaft for dispersing the slurry lifted up by the mud layer lifting and stirring section.

[0022] The sludge lifting and mixing section includes at least one set of auger spiral blades 1 disposed at the lower part of the thickener's mixing shaft. The auger spiral blades 1 are integral spiral mixing blades. The pitch of the auger spiral blades 1 gradually increases from bottom to top. A wear-resistant alloy layer is provided on the edge of the auger spiral blades 1. The slurry separation section is an inverted cone 2 sleeved on the upper part of the thickener's mixing shaft. The inverted cone 2 is fixedly connected to the thickener's mixing shaft. A through hole is provided on the inverted cone 2. A rake arm 3 is connected to the bottom end of the thickener's mixing shaft, and a water guide rod 4 is provided on the rake arm 3. Example 3

[0023] A thickener with an internal stirring shaft as described in Embodiment 1 or Embodiment 2. Its operation is as follows: When the thickener is running, the drive unit rotates the thickener's stirring shaft. The auger blades 1 at the bottom of the thickener's stirring shaft rotate accordingly, acting like a screw pump to continuously lift the high-concentration sludge layer deposited at the bottom of the tank. The lifted sludge layer mixes with the slurry in the upper middle part, achieving concentration homogenization and significantly reducing the bottom pressure. When the slurry moves with the auger blades to the upper part of the thickener's stirring shaft, it is blocked and dispersed by the fixed inverted cone 2, scattered along the cone surface, and then settles under gravity, re-participating in the thickening process. This circulating flow ensures the uniformity of the slurry concentration throughout the thickener and effectively prevents rakeing.

Claims

1. A thickener stirring shaft for preventing thickener rake compression and ensuring uniform underflow, the thickener stirring shaft being installed inside the thickener and serving as the thickener main shaft; characterized in that, The thickener mixing shaft includes a mud layer lifting and mixing section located at the lower part of the thickener mixing shaft for lifting and mixing the mud layer at the bottom of the thickener, and a slurry separation section located at the upper part of the thickener mixing shaft for dispersing the slurry lifted up by the mud layer lifting and mixing section.

2. The thickener stirring shaft as described in claim 1 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The mud layer lifting and mixing section includes at least one set of screw conveyor blades (1) disposed at the lower part of the thickener mixing shaft.

3. The thickener stirring shaft as described in claim 2 for preventing thickener rake compression and ensuring uniform underflow, characterized in that... The auger spiral blade (1) is a segmented spiral stirring blade or a whole-section spiral stirring blade.

4. The thickener stirring shaft as described in claim 2 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The pitch of the screw auger blade (1) gradually increases from bottom to top.

5. The thickener stirring shaft as described in claim 2 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The edge of the auger spiral blade (1) is provided with a wear-resistant alloy layer.

6. The thickener stirring shaft as described in claim 1 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The slurry separation section is an inverted cone (2) fitted onto the upper part of the thickener's mixing shaft.

7. The thickener stirring shaft as described in claim 6 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The inverted cone (2) is fixedly connected to the thickener's stirring shaft.

8. The thickener stirring shaft as described in claim 6 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The inverted cone (2) has a through hole.

9. The thickener stirring shaft as described in claim 2 for preventing thickener rake compression and ensuring uniform underflow, characterized in that, The bottom end of the thickener's stirring shaft is connected to a rake arm (3), and a water guide rod (4) is provided on the rake arm (3).

10. A thickener, characterized in that, The thickener is provided with a thickener stirring shaft as described in any one of claims 1 to 9 for preventing thickener rakes and ensuring uniform underflow.

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