Method and device for preparing ceramsite by using river and lake sediment

Abstract

The application discloses a method for preparing ceramic granules from river and lake sludge, and belongs to the field of ceramic granule preparation. The method comprises the steps of removing impurities, flocculating, drying, granulating and curing the river and lake sludge. The method can rapidly reduce the water content of the river and lake sludge, improve the drying efficiency and quality of the river and lake sludge, and provide a prerequisite for improving the quality of the ceramic granules.

Description

Technical Field

[0001] This invention relates to the field of ceramsite preparation, specifically a method and apparatus for preparing ceramsite using river and lake bottom sediment. Background Technology

[0002] River and lake sediment is a type of solid waste generated from sewage treatment, dredging projects, and other processes. It is rich in pathogens and microorganisms, and improper handling can easily cause secondary pollution. Current treatment methods mainly include landfilling, land application, and incineration. These methods easily cause secondary environmental pollution and fail to effectively utilize the river and lake sediment.

[0003] Expanded clay aggregate (ECA) boasts advantages such as light weight and high strength, along with excellent thermal insulation properties, making it a widely applicable material. However, traditional methods of producing ECA consume large quantities of non-renewable resources like clay, highlighting the importance of finding alternatives to clay. Therefore, using river and lake sediment to manufacture ECA can reduce clay consumption and minimize environmental pollution during sediment treatment.

[0004] However, due to the high water content of river and lake sediments, the production of expanded clay aggregates becomes more difficult. Secondly, as water evaporates and is lost during the production process, the expanded clay aggregates experience a decrease in density, strength, and stability, which in turn affects their performance and severely impacts their quality. Summary of the Invention

[0005] The purpose of this invention is to address the above problems by providing a method for preparing ceramsite using river and lake bottom sediment, which can dehydrate the river and lake bottom sediment to improve the quality of the ceramsite.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] Step 1: Filter the extracted river and lake sediment to remove solid impurities and obtain mud slurry.

[0008] Step 2: Add the mud to the flocculation equipment for flocculation. After flocculation is completed, discharge the clear liquid to obtain mud sediment.

[0009] Step 3: Dry the mud sediment to obtain dried bottom mud. The moisture content of the dried bottom mud should not exceed 10%.

[0010] Step 4: After the dried bottom mud is crushed, it is processed into primary ceramsite products by firing or non-firing.

[0011] Step 5: Curing the initial expanded clay product to obtain the finished expanded clay product.

[0012] By utilizing flocculation reaction to rapidly reduce the water content of river and lake bottom sediments, the drying efficiency and quality of river and lake bottom sediments can be improved, providing a prerequisite for improving the quality of ceramsite.

[0013] However, because the composition of the bottom sediment cannot be kept consistent, the volume of the sediment produced after flocculation will fluctuate within the range of 60-80%. If the inlet of the drain pipe is far from the solid-liquid boundary, a large amount of clear liquid will be left behind, affecting the subsequent drying efficiency and quality. If the inlet of the drain pipe is below the solid-liquid boundary, a large amount of sediment will be carried away, affecting the utilization rate of river and lake bottom sediment and the subsequent sewage treatment effect on the clear liquid. Therefore, this application also discloses an apparatus for preparing ceramsite using river and lake sediment. It includes a shell, within which a stirring shaft is arranged laterally. Stirring blades are arranged on the outer wall of the stirring shaft. The shell is equipped with a feed inlet, a discharge inlet, and a drain pipe. A sludge discharge pipe is located at the lower end of the shell. A vertically movable mounting frame is arranged above the stirring shaft within the shell. The outer diameter of the mounting frame matches the inner diameter of the shell. The mounting frame has a partition for separating the interior of the shell, which extends laterally. The lower end of the drain pipe extends into the shell and is nested with an extension pipe, which moves vertically. The vertically moving partition separates the precipitate from the clear liquid after flocculation, reducing the mixing of precipitate and clear liquid during discharge.

[0014] Furthermore, in order to install the partition while simultaneously driving it to unfold or retract, a through hole is provided in the middle of the mounting frame, and a sliding part that moves laterally is provided inside the through hole. The two ends of the partition are respectively connected to the sliding part and the inner wall of the through hole.

[0015] Furthermore, a guide rail is provided laterally inside the through hole, and the sliding part is disposed on the guide rail to improve the stability of the movement of the partition.

[0016] Furthermore, since the volume of the precipitate produced after flocculation will fluctuate within the range of 60-80%, in order to generate a stronger stirring force and allow the flocculant and river / lake sediment to be more fully stirred and mixed within the shell, the size of the stirring blades needs to be set as large as possible. This may cause the stirring blades to interfere with the descent of the mounting frame, preventing the mounting frame from moving to the solid-liquid boundary. Therefore, the stirring blades extend and retract radially along the stirring shaft. When stirring is completed and sedimentation begins, the size of the stirring blades shrinks to facilitate the subsequent descent of the mounting frame.

[0017] Furthermore, to drive the stirring blade to extend and retract, the stirring blade is formed by multiple sleeves that are sealed and nested in sequence. The end face of the outermost sleeve is closed, and the innermost sleeve is fixedly installed on the outer wall of the stirring shaft. An extension and retraction adjustment tube is provided inside the stirring blade, and the extension and retraction of the stirring blade is driven by the extension and retraction of the extension and retraction tube along the stirring shaft.

[0018] Furthermore, one method for driving the telescopic adjustment tube to extend or retract is to have a hollow stirring shaft with a concentric transverse shaft inside; the telescopic adjustment tube includes a threaded section and a receiving tube, the threaded section being threadedly connected to the receiving tube, one of the threaded section or the receiving tube being fixedly connected to the outermost sleeve, and the other extending into the stirring shaft and being drivenly connected to the transverse shaft; the transverse shaft is detachably connected to the output shaft of the adjustment motor, and the adjustment motor is located on the outside of the housing.

[0019] Furthermore, during the addition of flocculant and the flocculation reaction, the stirring blades agitate the material inside the shell. At this time, the diameter of the stirring blades is at its maximum. It is required that the transverse shaft and the stirring shaft rotate synchronously to avoid uncontrolled expansion and contraction of the stirring blades during the agitation process. After the agitation is completed, it is required that the transverse shaft and the stirring shaft rotate relative to each other to ensure controlled expansion and contraction of the stirring blades. For this purpose, the stirring shaft is fixedly connected to the end cover on the side of the regulating motor. The end cover is connected to the inner wall of the shell through a sealed bearing. A fixed connecting sleeve concentric with the transverse shaft is provided. The fixed connecting sleeve is open on the side of the regulating motor. A movable connecting part is provided on the output shaft of the regulating motor. The movable connecting part passes through the end cover and connects or separates from the fixed connecting sleeve under the action of the connecting drive mechanism.

[0020] Furthermore, to control the synchronization of the movement of the transverse shaft and the stirring shaft, a swing key is rotatably provided on the side wall of the fixed connecting sleeve. When the movable connecting part is not connected to the fixed connecting sleeve, one end of the swing key extends into the fixed connecting sleeve and is located on the movement path of the movable connecting part, while the other end of the swing key extends out of the fixed connecting sleeve and engages with the drive groove on the end cover.

[0021] Furthermore, in order to drive the rotation of the stirring shaft, the stirring shaft passes through the housing and is connected to the stirring motor at the end opposite to the adjusting motor.

[0022] Furthermore, a positioning groove is provided on the end face of the stirring shaft extending out of the housing. The positioning groove is adapted to the positioning part. The positioning part moves under the drive of the positioning drive mechanism. After stirring is completed, the positioning part cooperates with the positioning groove to ensure that the stirring shaft does not rotate.

[0023] The beneficial effects of this invention are: through flocculation reaction, the solid matter in the river and lake bottom sediment is more compacted, and the water content of the river and lake bottom sediment is reduced rapidly, so as to improve the drying efficiency and quality of the river and lake bottom sediment, providing a prerequisite for improving the quality of ceramsite.

[0024] At the same time, after the flocculation reaction ends and sedimentation is completed, the height of the mounting frame is controlled according to the solid-liquid boundary line. Then the partition is unfolded to separate the solid and liquid. In this way, the amount of mud carried out during the discharge of clear liquid can be reduced, ensuring the flocculation effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure with the partition in its unfolded state.

[0026] Figure 2 This is a schematic diagram of the structure in the contracted state of the partition.

[0027] Figure 3 This is a schematic diagram of the installation structure of the partition section from a top-down view.

[0028] Figure 4 This is a schematic diagram of a partial internal structure of the stirring shaft.

[0029] Figure 5 for Figure 4 Schematic diagram of the structure at point A in the middle.

[0030] Figure 6 This is a schematic diagram of an assembly structure for a telescopic regulating pipe.

[0031] The text labels in the diagram represent: 1. Shell; 2. Stirring shaft; 3. Stirring blade; 4. Feed inlet; 5. Feed port; 6. Drain pipe; 7. Sludge discharge pipe; 8. Mounting bracket; 9. Divider; 10. Extension pipe; 11. Through hole; 12. Sliding part; 13. Guide rail; 14. Sleeve; 15. Telescopic adjustment pipe; 16. Horizontal shaft; 17. Threaded section; 18. Storage pipe; 19. Adjustment motor; 20. End cap; 21. Fixed connecting sleeve; 22. Movable connecting part; 23. Connecting drive mechanism; 24. Swing key; 25. Stirring motor; 26. Positioning part; 27. Positioning drive mechanism. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0033] Example 1: As Figure 1-3As shown, this embodiment discloses an apparatus for preparing ceramsite using river and lake bottom sediment. It includes a shell 1, inside which a stirring shaft 2 is arranged laterally. The stirring shaft 2 rotates around its axis under the drive of a stirring motor 25. The stirring shaft 2 is located at the lower part of the shell 1. Stirring blades 3 are arranged at intervals along the axial direction on the outer wall of the stirring shaft 2. The stirring blades 3 are arranged radially along the stirring shaft 2. The shell 1 is provided with a feed inlet 4, a feeding port 5, and a drain pipe 6. A mud discharge pipe 7 is provided at the lower end of the shell 1, and a pressure relief pipe is provided at the upper end of the shell 1. A vertically movable mounting frame 8 is provided above the stirring shaft 2 inside the shell 1. The mounting frame 8 can be driven by an electric push rod, a hydraulic cylinder, etc., or the mounting frame 8 can be connected to a vertically arranged screw, and the rotation of the screw drives the lifting and lowering of the mounting frame 8. The outer wall of the mounting frame 8 is connected to the inner wall of the shell 1 by a keyway. The outer diameter of the mounting bracket 8 is adapted to the inner diameter of the housing 1. A through hole 11 is provided in the middle of the mounting bracket 8. A guide rail 13 is provided in the transverse direction of the through hole 11. A sliding part 12 is provided on the guide rail 13. The sliding part 12 moves along the guide rail 13 under the drive of a linear module, a motor, etc.

[0034] The two ends of the partition 9 are connected to the sliding part 12 and the inner wall of the through hole 11, respectively, so that the partition 9 can expand or contract with the movement of the sliding part 12. The partition 9 can be made of nylon, fluororubber coated cloth, etc., or it can be made of multiple metal plates that are compatible with the inner diameter of the through hole 11, nested in sequence, or it can be made of multiple plates combined. The upper and lower ends of two adjacent plates are connected by slide rails such as T-shaped rails. The end of the slide rail is provided with a limiting part with an outer diameter larger than the slide rail itself to ensure that the two adjacent plates will not fall off, and also to ensure that the partition 9 can expand or contract. The lower end of the drain pipe 6 extends into the housing 1 and is nested and connected to the extension pipe 10. The extension pipe 10 moves vertically under the drive of a hydraulic cylinder, screw jack, etc.

[0035] A method for preparing ceramsite using river and lake bottom sediment includes the following steps:

[0036] Step 1: Filter the extracted river and lake bottom mud to remove solid impurities and obtain mud slurry. The mud slurry enters the shell 1 through the feed port 4. At this time, the mounting frame 8 and the extension pipe 10 are located on the upper part of the shell 1, with the extension pipe 10 located above the mounting frame 8. The partition 9 is in a retracted state, and the mud discharge pipe 7 is closed.

[0037] Step 2: When the slurry enters the shell 1, flocculant is added into the shell 1 through the feed port 5. Simultaneously, the stirring shaft 2 begins to rotate to agitate the material inside the shell 1. After flocculation and sedimentation are complete, the height of the upper surface of the sediment can be measured visually or by measuring the propagation time and reflected signal of ultrasound in the liquid using an ultrasonic sensor, and calculating the depth of the sediment to determine the solid-liquid boundary. After determining the solid-liquid boundary, the mounting frame 8 descends above the boundary, and then the partition 9 unfolds to separate the sediment and the clear liquid through the partition 9 and the mounting frame 8. Next, the extension pipe 10 descends to the partition 9, and a water pump connected to the drain pipe 6 is used to remove the clear liquid produced by flocculation from the shell 1. After the clear liquid is discharged, slurry sediment is obtained.

[0038] Step 3: Open the sludge discharge pipe 7 and collect the sludge sediment discharged from the sludge discharge pipe 7. Use a filter press, dryer, etc. to dry the sludge sediment to obtain dried bottom mud. The moisture content of the dried bottom mud should not exceed 10%.

[0039] Step 4: After the dried bottom mud is crushed, it is processed into primary ceramsite products by firing or non-firing.

[0040] Step 5: Curing the initial expanded clay product to obtain the finished expanded clay product.

[0041] Example 2, as Figure 4 , 6 As shown, other structures and working processes in this embodiment refer to Embodiment 1, but in this embodiment, the stirring blade 3 extends and retracts radially along the stirring shaft 2.

[0042] Therefore, the stirring blade 3 is formed by multiple sleeves 14 being sealed and nested in sequence. A sealing and filling mechanism such as a piston ring is provided between two adjacent sleeves. The end face of the outermost sleeve 14 is closed, and the innermost sleeve 14 is fixedly installed on the outer wall of the stirring shaft 2. A telescopic adjustment tube 15 is provided inside the stirring blade 3. The telescopic adjustment tube 15 can be extended and retracted radially along the stirring shaft 2 under the drive of a cylinder or the like, so as to drive the stirring blade 3 to extend and retract. However, since the stirring shaft 2 rotates, its interior is hollow. A transverse shaft 16, concentric with the stirring shaft 2, is installed inside. Supports are spaced along the axial direction on the inner wall of the stirring shaft, and bearings are installed between the supports and the transverse shaft 16 to ensure the coaxiality of the transverse shaft 16 and the stirring shaft 2. The telescopic adjustment tube 15 includes a threaded section 17 and a receiving tube 18. The threaded section 17 is threadedly connected to the receiving tube 18. One of the threaded section 17 or the receiving tube 18 is fixedly connected to the outermost sleeve 14, and the other extends into the stirring shaft 2 and is connected to the transverse shaft 16 for transmission. Figure 4One end of the threaded section 17 is fixedly mounted on the inner end face of the outermost sleeve 14, and the other end of the threaded section 17 extends into the threaded groove of the receiving tube 18. The receiving tube 18 passes through the bearing on the side wall of the stirring shaft 2 and connects to the transmission bevel gear. A drive main gear that meshes with the transmission bevel gear is provided on the transverse shaft 16. Figure 6 One end of the receiving tube 18 is fixedly set on the inner end face of the outermost sleeve 14, and the other end of the receiving tube 18 is provided with a threaded groove. One end of the threaded section 17 is threadedly connected to the threaded groove, and the other end of the threaded section 17 is provided with a rotating shaft. The rotating shaft passes through the bearing on the side wall of the stirring shaft 2 and is connected to the transmission bevel gear. The transverse shaft 16 is provided with a driving main gear that meshes with the transmission bevel gear. The telescopic adjustment tube 15 and the transverse shaft 16 can also be connected by other gears or other means of transmission.

[0043] The transverse shaft 16 and the output shaft of the regulating motor 19 are detachably connected by a coupling or the like, and the regulating motor 19 is located on the outside of the housing.

[0044] Specific working process: As the stirring blade 3 rotates with the stirring shaft 2, the transverse shaft 16 separates from the output shaft of the regulating motor 19. The transverse shaft 16 moves synchronously with the stirring shaft 2. For this purpose, a clamping mechanism can be installed inside the stirring shaft 2 to clamp the transverse shaft 16 during the rotation of the stirring shaft 2, so that the transverse shaft 16 moves synchronously with the stirring shaft 2. After stirring is completed, before the mounting frame 8 descends, the transverse shaft 16 is connected to the output shaft of the regulating motor 19. If a clamping mechanism is installed, the transverse shaft is released at this time. Subsequently, the transverse shaft 16 rotates under the drive of the regulating motor 19. Since the stirring shaft 2 is in a stopped state at this time, the rotation of the transverse shaft 16 will drive the threaded section 17 or the receiving tube 18 to rotate, causing the length of the telescopic regulating tube 15 to shrink, thereby causing the stirring blade 3 to be in a retracted state.

[0045] Example 3, as Figure 4-5As shown, other structures and working processes in this embodiment refer to Embodiment 2. However, in this embodiment, the stirring shaft 2 is fixedly connected to the end cover 20 on one side of the regulating motor 19. The end cover 20 includes a cover plate connected to the end face of the stirring shaft 2 and a sealing ring fixedly installed on the cover plate. The sealing ring is connected to the inner wall of the housing 1 through a sealing bearing. A through hole is provided in the middle of the cover plate. A fixed connecting sleeve 21 concentric with the horizontal shaft 16 is fixedly installed on it. The fixed connecting sleeve 21 passes through the through hole. The fixed connecting sleeve 21 is open on one side of the regulating motor 19. Its open part is either a polygon with a non-circular cross section or has a long key on the inner wall along the length direction of the stirring shaft 2. A movable connecting part 22 is provided on the output shaft of the regulating motor 19. The movable connecting part 22 and the output shaft of the regulating motor 19 are keyed together. The movable connecting part 22 passes through the end cover 20 and connects or separates from the fixed connecting sleeve 21 under the action of the connecting drive mechanism 23. The connecting drive mechanism 23 can be an electric push rod, a cylinder, etc. The shape of the movable connecting part 22 is adapted to the fixed connecting sleeve 21.

[0046] The fixed connecting sleeve 21 has a long groove on its side wall. The groove is connected to the swing key 24 through a pin, torsion spring, etc. When the movable connecting part 22 is not connected to the fixed connecting sleeve 21, one end of the swing key 24 extends into the fixed connecting sleeve 21 and is located on the moving path of the movable connecting part 22. The other end of the swing key 24 extends out of the fixed connecting sleeve 21 and cooperates with the drive groove on the cover plate.

[0047] In operation: During stirring, the swing key 24 is in a vertical position and locked in the drive groove, causing the horizontal shaft 16 to rotate synchronously with the stirring shaft 2. After stirring, the connecting drive mechanism 23 drives the movable connecting part 22 to extend into the fixed connecting sleeve 21. During the movement of the movable connecting part 22, it pushes the swing key 24, causing the swing key 24 to rotate to a horizontal position, at which point the swing key 24 separates from the drive groove. Then, the motor 19 is adjusted to rotate the horizontal shaft 16, driving the stirring blade 3 to retract. When it is necessary to stir the material in the shell 1 again, the motor 19 is adjusted to rotate in the opposite direction, causing the stirring blade 3 to unfold. Then, the movable connecting part 22 separates from the fixed connecting sleeve 21, and the swing key 24, no longer restricted by the movable connecting part 22, returns to a vertical position under the action of the torsion spring, etc. As the stirring shaft 2 rotates, the swing key 24 re-locks into the drive groove.

[0048] Example 4, as Figure 1-2As shown, other structures and working processes in this embodiment refer to Embodiments 2 or 3. However, in this embodiment, the stirring shaft 2 passes through the housing 1 and is connected to the stirring motor 25 at the end opposite to the adjusting motor 19. A positioning groove is provided on the end face of the stirring shaft 2 extending out of the housing 1. The positioning groove is a non-circular polygon. The positioning groove is adapted to the positioning part 26. The positioning part 26 moves under the drive of the positioning drive mechanism 27. The positioning drive mechanism 27 can be a hydraulic cylinder, an electric push rod, etc.

[0049] Specific working process: When the stirring shaft 2 is working, the positioning groove separates from the positioning part 26. When the stirring shaft 2 stops working, the positioning part 26 engages with the positioning groove to fix the stirring shaft 2.

[0050] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A device for preparing ceramsite by using river and lake sediment, comprising a shell (1), a stirring shaft (2) is arranged in the shell (1) in the transverse direction, stirring blades (3) are arranged on the outer side wall of the stirring shaft (2), a feeding port (4), a feeding port (5) and a liquid discharge pipe (6) are arranged on the shell (1), and a sediment discharge pipe (7) is arranged at the lower end of the shell (1); characterized in that, The shell (1) is provided with a mounting frame (8) moving vertically above the stirring shaft (2), the outer diameter of the mounting frame (8) is matched with the inner diameter of the shell (1), the mounting frame (8) is provided with a partition (9) for separating the inside of the shell (1), the middle of the mounting frame (8) is provided with a through hole (11), the through hole (11) is provided with a sliding part (12) moving transversely, the two ends of the partition (9) are connected with the sliding part (12) and the inner wall of the through hole (11) respectively; the lower end of the liquid discharge pipe (6) extends into the shell (1) and is nested with the extension pipe (10), the extension pipe (10) moves vertically. After the flocculation is completed and the flocculation is completed, the mounting frame (8) is lowered above the solid-liquid boundary, then the partition (9) is unfolded to separate the precipitate and the clear liquid, then the extension pipe (10) is lowered to the partition (9).

2. The device for preparing ceramsite from river and lake sediment according to claim 1, characterized in that, The through hole (11) is provided with a guide rail (13) moving transversely, and the sliding part (12) is arranged on the guide rail (13).

3. The device for preparing ceramsite from river and lake sediment according to claim 1, characterized in that, The stirring blade (3) expands and contracts radially along the stirring shaft (2).

4. The device for preparing ceramsite from river and lake sediment according to claim 3, characterized in that, The stirring blade (3) is formed by a plurality of sleeve pipes (14) sealed and nested in sequence, the end face of the outermost sleeve pipe (14) is closed, and the innermost sleeve pipe (14) is fixedly arranged on the outer side wall of the stirring shaft (2); the stirring blade (3) is provided with an expansion adjusting pipe (15), which expands and contracts radially along the stirring shaft (2) to drive the stirring blade (3) to expand and contract.

5. The device for preparing ceramsite from river and lake sediment according to claim 4, characterized in that, The stirring shaft (2) is hollow, and the stirring shaft (2) is provided with a transverse shaft (16) concentric with it; the expansion adjusting pipe (15) comprises a threaded section (17) and a receiving pipe (18), the threaded section (17) is threadedly connected with the receiving pipe (18), one of the threaded section (17) or the receiving pipe (18) is fixedly connected with the outermost sleeve pipe (14), and the other one extends into the stirring shaft (2) and is in transmission connection with the transverse shaft (16); the transverse shaft (16) is detachably connected with the output shaft of the adjusting motor (19), and the adjusting motor (19) is arranged on the outer side of the shell (1).

6. The device for preparing ceramsite from river and lake sediment according to claim 5, characterized in that, The stirring shaft (2) is fixedly connected with an end cover (20) on the side of the adjusting motor (19), the end cover (20) is connected with the inner side wall of the shell (1) through a sealing bearing, the transverse shaft (16) is provided with a fixed connection sleeve (21) concentric with it, the fixed connection sleeve (21) is open on the side of the adjusting motor (19), the output shaft of the adjusting motor (19) is provided with a movable connection part (22), and the movable connection part (22) is connected with or separated from the fixed connection sleeve (21) through the end cover (20) under the action of a connection driving mechanism (23).

7. The device for preparing ceramsite from river and lake sediment according to claim 6, characterized in that, The side wall of the fixed connection sleeve (21) is rotatably provided with a swing key (24), when the movable connection part (22) is not connected with the fixed connection sleeve (21), one end of the swing key (24) extends into the fixed connection sleeve (21) and is located on the movement path of the movable connection part (22), and the other end of the swing key (24) extends out of the fixed connection sleeve (21) and cooperates with the driving groove on the end cover (20).

8. The device for preparing ceramsite from river and lake sediment according to claim 5, characterized in that, The stirring shaft (2) passes through the shell (1) at the opposite end of the adjusting motor (19) and is in driving connection with the stirring motor (25).

9. The device for preparing ceramsite from river and lake sediment according to claim 8, characterized in that, The end surface of the stirring shaft (2) extending out of the shell (1) is provided with a positioning groove, the positioning groove is matched with a positioning part (26), and the positioning part (26) moves under the driving of a positioning driving mechanism (27).

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