A slurry homogenizing and stirring device for coal gangue overburden separation filling

Abstract

This invention discloses a slurry homogenization and mixing device for coal gangue overburden delamination backfilling, belonging to the technical field of mine backfilling machinery and equipment. It solves the technical problems of traditional mixing devices having fixed blade spacing and helical angle, lacking flexibility and adaptability, and having a main shaft easily worn by coal gangue particles. The device includes an outer shell structure, a main shaft, a first bushing structure, a second bushing structure, a connecting structure, and a blade fixing structure. The main shaft is housed within a U-shaped mixing tank in the outer shell structure. Both ends of the main shaft are positioned and supported by the first and second bushing structures. Several blade fixing structures are slidably mounted on the main shaft, and adjacent blade fixing structures and those connected to the bushing structures are fixed by connecting structures. This device allows for flexible adjustment of the blade spacing and helical angle to adapt to the homogenization and mixing requirements of different coal gangue slurries. It features good main shaft protection, robust structural connections, and high mixing stability, significantly improving the device's adaptability and service life. It is suitable for the slurry preparation process in coal gangue backfilling.

Description

Technical Field

[0001] This invention relates to the field of mine backfilling machinery and equipment, specifically to a slurry homogenization and mixing device for coal gangue overburden separation backfilling. It is applicable to the homogenization and mixing process of slurry preparation in the coal gangue overburden separation backfilling process. The mixing structure can be flexibly adjusted according to the coal gangue particle size and slurry ratio to improve the slurry homogenization effect. Background Technology

[0002] In the construction method for harmless treatment of coal gangue overburden separation filling, the homogenization degree of slurry preparation directly affects the subsequent pipeline transportation effect and the compaction of the overburden separation filling. The layout of the mixing blades of the mixing device is the key to determining the homogenization effect of the slurry. The existing coal gangue slurry mixing device has a fixed connection structure between the mixing blades and the main shaft. The spacing between adjacent mixing blades and the spiral angle cannot be adjusted, which means that the device can only be adapted to the mixing of a single specification of coal gangue slurry. When facing coal gangue slurry with different particle sizes and different solid content, the mixing and homogenization effect is poor, and problems such as particle agglomeration and uneven slurry density are prone to occur, which in turn cause pipeline blockage and poor filling support effect.

[0003] Meanwhile, the main shaft of traditional mixing devices is directly exposed inside the mixing tank, coming into direct contact and rubbing against hard coal gangue particles. After long-term use, the main shaft is prone to wear and deformation, affecting mixing stability and shortening the equipment's service life. In addition, the disassembly, assembly, and adjustment of the mixing blades in existing mixing devices are cumbersome, requiring specialized tools and a large amount of manual operation, resulting in low adjustment efficiency and failing to meet the needs of rapid on-site switching of construction conditions.

[0004] Therefore, there is an urgent need to develop a slurry homogenizing and mixing device for coal gangue overburden separation filling that can flexibly adjust the spacing and helical angle of the mixing blades, has good main shaft protection, and is easy to disassemble and adjust, so as to solve the shortcomings of the existing technology. Summary of the Invention

[0005] This invention addresses the problems of fixed impeller layout, easy wear of the main shaft, and cumbersome adjustment and disassembly in existing technologies. It provides a slurry homogenization and mixing device for coal gangue overburden separation filling, enabling flexible and precise adjustment of the impeller spacing and helical angle to adapt to the homogenization and mixing needs of different coal gangue slurries. At the same time, it provides full protection for the main shaft, reducing wear of coal gangue particles and extending the service life of the main shaft. In addition, it simplifies the disassembly and adjustment process of the mixing structure, improves on-site operation efficiency, and ensures a firm connection and high mixing stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A slurry homogenization and mixing device for filling coal gangue overburden separation includes an outer shell structure, a main shaft, a first shaft sleeve structure, a second shaft sleeve structure, a connecting structure, and a mixing blade fixing structure.

[0007] The outer shell structure consists of a U-shaped mixing tank, a first end cover, and a second end cover. The first end cover and the second end cover are respectively fixedly welded to both ends of the U-shaped mixing tank to form a closed mixing chamber. A discharge port is opened on the bottom surface of the U-shaped mixing tank near the second end cover for discharging the slurry after mixing. Support legs are fixed at the four corners of the bottom surface to achieve stable support of the device. A main shaft is set inside the U-shaped mixing tank. Multiple toothed grooves are evenly opened on the outer side of the main shaft along the axial direction to provide a foundation for circumferential anti-rotation of the subsequent structure.

[0008] The first bushing structure is rotatably mounted on the first end cover via bearings, including a first turntable. The first turntable passes through the first end cover and is rotatably connected to the first end cover via bearings. Two first limiting rings are fixedly fitted on the first turntable, and the two first limiting rings respectively fit against both sides of the first end cover to limit the axial displacement of the first turntable. A slidable bushing passes through the axis of the first turntable and the two are slidably connected. Several limiting strips are evenly fixed along the axial direction on the outer side of the slidable bushing. A limiting groove is opened on the first turntable for the limiting strips to pass through. Through the cooperation of the limiting strips and the limiting grooves, the first turntable and the slidable bushing are prevented from rotating relative to each other, ensuring the synchronous transmission of power.

[0009] A first positioning cylinder is fixed at one end of the sliding bushing that extends into the U-shaped mixing tank. Six first positioning holes are evenly opened on the end face of the first positioning cylinder for positioning connection with the connecting structure. A flange is fixed at the other end of the sliding bushing. The flange is fixedly connected to the first turntable by long bolts. The side wall of the first turntable is provided with threaded holes for long bolts to be screwed in. The axial fixation of the sliding bushing can be achieved by long bolts to prevent it from sliding.

[0010] The second bushing structure is rotatably mounted on the second end cover via a bearing, including a second turntable. The second turntable passes through the second end cover and is rotatably connected to the second end cover via a bearing. Two second limiting rings are fixedly fitted on the second turntable, and the two second limiting rings respectively fit against both sides of the second end cover to limit the axial displacement of the second turntable. A second positioning cylinder is fixed at one end of the second turntable that extends into the U-shaped stirring tank. Six second positioning holes are evenly opened on the end face of the second positioning cylinder for positioning connection with the connecting structure.

[0011] The other end of the second turntable is fixed with a pull-out structure for pushing and pulling the main shaft to achieve disassembly and assembly. The pull-out structure includes a lead screw fixed to one end of the main shaft and a C-shaped bracket fixed to one side of the second turntable. The side wall of the C-shaped bracket passes through the third turntable and the two are rotatably connected by bearings. Two third limit rings are fixedly fitted on the third turntable. The two third limit rings fit against the inner and outer sides of the C-shaped bracket respectively to limit the axial displacement of the third turntable. The third turntable is fitted on the lead screw, and a hexagonal nut is fixed at one end of it and the hexagonal nut is screwed to the lead screw. Tightening the hexagonal nut can drive the main shaft to slide axially through the lead screw.

[0012] The connecting structure is used to connect adjacent stirring blade fixing structures and stirring blade fixing structures with shaft sleeve structures. It includes a connecting cylinder that is slidably sleeved on the main shaft. The inner walls of the connecting cylinder, the second turntable, and the slidable shaft sleeve are all uniformly fixed with limiting teeth that match the outer tooth groove of the main shaft. Through the cooperation of the limiting teeth and the tooth groove, only axial sliding between each structure and the main shaft is allowed, preventing circumferential relative rotation and ensuring synchronous transmission of stirring power.

[0013] A positioning disc is fixedly fitted at the center of the connecting cylinder, and first positioning toothed discs are fixed on both sides of the positioning disc. An annular cover is fixedly fitted on the positioning disc. Two connecting discs are provided inside the annular cover. The connecting discs slide and rotate on the connecting cylinder. A second positioning toothed disc is fixed on the side of the connecting disc facing the positioning disc. The second positioning toothed disc and the first positioning toothed disc can mesh with each other. A spring is provided between the connecting disc and the positioning disc and is fitted on the connecting cylinder. The spring provides a return force for the connecting disc.

[0014] Six insertion rods are evenly fixed on the other side of the connecting plate for insertion and positioning with each positioning hole; several locking bolts are screwed on both sides of the annular cover. The annular cover has hidden grooves on both sides for the locking bolts to be screwed in and for the nuts to be embedded. The hidden grooves can prevent the locking bolt nuts from being directly damaged by coal gangue particles; when the locking bolts are tightened, their ends can push the connecting plate closer to the positioning plate, so that the second positioning toothed plate and the first positioning toothed plate are tightly engaged, thereby achieving circumferential fixation of the connecting plate.

[0015] The stirring blade fixing structure is slidably sleeved on the main shaft, including a mounting cylinder. The inner wall of the mounting cylinder is smooth and can rotate on the main shaft, providing a basis for adjusting the spiral angle of the stirring blade. A third positioning cylinder is fixed at both ends of the mounting cylinder. Six third positioning holes are evenly opened on the end face of the third positioning cylinder. The opening positions of the six third positioning holes, the second positioning holes and the first positioning holes are all matched with the setting positions of the six insertion rods of the connecting structure. The insertion rods can be inserted into each positioning hole to achieve positioning connection.

[0016] A stirring blade fixing rod is fixed at the center of the outer side of the mounting cylinder. The stirring blade is fixed to the stirring blade fixing rod by bolts, which facilitates the disassembly and replacement of the stirring blade. The mounting cylinder has a multi-specification length structure, and the appropriate length of the mounting cylinder can be selected according to the spacing requirements of two adjacent stirring blades, so as to realize the flexible adjustment of the stirring blade spacing.

[0017] The third positioning cylinder of the stirring blade fixing structure can be inserted into the annular cover of the connecting structure and sleeved on the connecting cylinder. The end of the mounting cylinder can fit against the side wall of the annular cover to ensure tightness of the connection. The main shaft in the U-shaped stirring tank is protected by the sliding bushing of the first bushing structure, the second turntable of the second bushing structure, the mounting cylinder of the stirring blade fixing structure, and the annular cover of the connecting structure, which avoids direct contact between the main shaft and coal gangue particles and reduces wear. One end of the main shaft can pass through the sliding bushing to be connected to an external drive motor to provide power for stirring.

[0018] Compared with existing technologies, the beneficial effects of this invention are: 1. This invention achieves flexible adjustment of the spacing between adjacent mixing blades by using installation cylinders of various lengths. The appropriate length of the installation cylinder is selected according to the particle size of the coal gangue and the solid content of the slurry. At the same time, the spiral angle of the mixing blades is precisely adjusted by the rotation of the connecting disc and the meshing of the toothed disc. This completely solves the defects of the fixed layout of the mixing blades in traditional devices, adapts to the homogenization and mixing needs of different coal gangue slurries, and greatly improves the adaptability of the device and the homogenization effect of the slurry.

[0019] 2. This invention, through the cooperation of the toothed groove and the limiting tooth, ensures that the connecting cylinder, the second turntable, and the sliding bushing can only slide along the main shaft axis, preventing relative rotation in the circumferential direction and ensuring the synchronous transmission of stirring power; at the same time, through the insertion of the insertion rod and the positioning hole and the meshing and locking of the toothed disc, a firm connection of each structure is achieved, avoiding displacement or loosening during the stirring process and improving the stirring stability.

[0020] 3. The main shaft of the present invention is fully enclosed and protected by a sliding bushing, a second turntable, a mounting cylinder and an annular cover, which avoids direct contact and friction between the main shaft and hard coal gangue particles, effectively reducing wear and deformation of the main shaft, and greatly improving the service life of the main shaft and the operational stability of the equipment.

[0021] 4. This invention achieves axial push-pull of the main shaft through a pull-out structure, which, combined with the sliding connection of each structure, simplifies the disassembly and assembly process of the stirring blade fixing structure and the connecting structure. The stirring blade layout can be adjusted without professional tools, improving on-site operation efficiency. At the same time, the nuts of the locking bolts are embedded in the hidden groove to avoid contact with coal gangue particles and damage, thus improving the durability of the structure.

[0022] 5. The stirring blade of the present invention is connected to the stirring blade fixing rod by bolts, which facilitates the disassembly, replacement and maintenance of the stirring blade. Different specifications of stirring blades can be replaced according to the stirring requirements, further improving the adaptability of the device. The discharge port of the U-shaped stirring tank is located near the second end cover to ensure that the slurry is completely discharged without residue.

[0023] 6. The present invention has a compact overall structure, reasonable connection of each component, smooth transmission of stirring power, good protection, and convenient adjustment. It can be directly integrated into the slurry preparation system for coal gangue overburden separation filling and seamlessly connected with the tunnel pipeline transportation system, effectively improving the efficiency and quality of slurry preparation and promoting the industrial application of the coal gangue overburden separation filling construction method. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure described in this invention; Figure 2 The structure described in this invention Figure 1 Enlarged view of part A in the middle; Figure 3 The structure described in this invention Figure 1 Enlarged view of part B in the middle; Figure 4 The structure described in this invention Figure 1 A separate schematic diagram of the first bushing structure; Figure 5 The structure described in this invention Figure 1 A separate schematic diagram of the second bushing structure; Figure 6 This is a schematic diagram of the operation of the structure described in this invention when the stirring blade fixing structure is installed on the main shaft; Figure 7 This is an enlarged schematic diagram of the structure described in this invention during the installation process; Figure 8 This is a cross-sectional view of the structure described in this invention during the installation process.

[0025] In the diagram: 1. Outer shell structure; 2. U-shaped mixing tank; 3. First end cover; 4. Second end cover; 5. Support leg; 6. First bushing structure; 7. Second bushing structure; 8. Main shaft; 9. Mixing blade fixing structure; 10. Connecting structure; 11. First turntable; 12. First limiting ring; 13. Sliding bushing; 14. Limiting strip; 15. Limiting groove; 16. Flange; 17. Long bolt; 18. Threaded hole; 19. First positioning hole; 20. Second turntable; 21. Second limiting ring; 22. C-shaped bracket; 23. Third turntable; 24. Third limiting ring; 25. Hexagonal nut; 26. First positioning cylinder; 27. Second positioning cylinder; 28. Second positioning hole; 29. ​​Mounting cylinder; 30. Mixing blade fixing rod; 31. Mixing blade; 32. Third positioning cylinder; 33. Third positioning hole; 34. Connecting cylinder; 35. Positioning plate; 36. Locking bolt; 37. First positioning toothed plate; 38. Connecting plate. Second positioning gear plate 39, spring 40, insert rod 41, hidden groove 42, lead screw 43, discharge port 44, tooth groove 45, annular cover 46. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments: The slurry homogenization and mixing device for coal gangue overburden separation filling of the present invention is assembled by first installing the first bushing structure 6 on the first end cover 3 through bearings, and the second bushing structure 7 on the second end cover 4 through bearings. Then, the first end cover 3 and the second end cover 4 are respectively welded to the two ends of the U-shaped mixing tank 2 to complete the assembly of the outer shell structure 1 and the bushing structure. The main shaft 8 is inserted into the U-shaped mixing tank 2, so that one end of the main shaft 8 passes through the second turntable 20 of the second bushing structure 7 and is fixed with the lead screw 43, and the other end is inserted into the sliding bushing 13 of the first bushing structure 6.

[0027] Based on the mixing requirements of the coal gangue slurry on site, an installation cylinder 29 of suitable length is selected to assemble the mixing blade fixing structure 9, and the mixing blade 31 is fixed to the mixing blade fixing rod 30 with bolts; the hexagonal nut 25 is tightened to pull the main shaft 8 outward through the screw 43, and at the same time the long bolt 17 is loosened to pull the flange 16 outward, so that the sliding bushing 13 is separated from the end of the main shaft 8. Then the connecting structure 10 and the mixing blade fixing structure 9 are alternately fitted onto the main shaft 8: First, insert the first connecting structure 10 through one end of the main shaft 8 and slide it until it fits against the second bushing structure 7. Then, insert the six insert rods 41 on one side of the connecting structure 10 into the six second positioning holes 28 of the second positioning cylinder 27. Tighten the locking bolts 36 on the corresponding side of the annular cover 46 and push the connecting plate 38 to make the gear plate mesh, thus completing the fixing of the first connecting structure 10. Insert the first stirring blade fixing structure 9 into the main shaft 8, push it close to the first connecting structure 10, rotate the connecting plate 38 on the other side of the connecting structure 10 so that the insertion rod 41 is aligned with the third positioning hole 33 of the third positioning cylinder 32, push the stirring blade fixing structure 9 so that the insertion rod 41 is inserted into the third positioning hole 33, the third positioning cylinder 32 is inserted into the annular cover 46, the end of the mounting cylinder 29 is in contact with the annular cover 46, and tighten the locking bolt 36 to complete the fixing; The connecting structure 10 and the stirring blade fixing structure 9 are alternately inserted in sequence. The rotation angle of the stirring blade fixing structure 9 is adjusted so that the adjacent stirring blades 31 form a preset spiral angle. The locking bolt 36 is tightened to fix the angle through the meshing of the gear plate until the stirring structure on the main shaft 8 is assembled. Push the sliding bushing 13 back onto the end of the main shaft 8, and fix the flange 16 to the first turntable 11 with the long bolt 17, so that the first positioning cylinder 26 of the sliding bushing 13 is inserted and positioned with the outermost connecting structure 10 insert rod 41. Tighten the hexagonal nut 25 in the opposite direction to push the main shaft 8 back to its original position, so that one end of the main shaft 8 passes through the sliding bushing 13 and is connected to the external drive motor, thus completing the assembly of the whole device.

[0028] When the device is working, the external drive motor drives the main shaft 8 to rotate. The main shaft 8 drives the first shaft sleeve structure 6, the second shaft sleeve structure 7, the connecting structure 10 and the stirring blade fixing structure 9 to rotate synchronously through the cooperation of the tooth groove 45 and the limiting tooth. The stirring blade 31 homogenizes and stirs the coal gangue slurry in the U-shaped stirring tank 2. After the stirring is completed, the slurry is discharged through the discharge port 44 and enters the subsequent tunnel pipeline transportation process.

[0029] When it is necessary to change the layout of the stirring blades to adapt to new construction conditions, repeat the above-mentioned process of pulling the main shaft, disassembling and assembling the connecting structure 10 and the stirring blade fixing structure 9, select the appropriate length of the installation cylinder 29 and adjust the spiral angle of the stirring blades, and then put it into use after reassembly. The operation is convenient and the adjustment efficiency is high.

[0030] Working principle: Power transmission principle: An external drive motor is connected to one end of the main shaft 8, driving the main shaft 8 to rotate. The outer side of the main shaft 8 is provided with an axial toothed groove 45. The inner walls of the connecting cylinder 34, the second turntable 20 and the sliding bushing 13 are all provided with matching limiting teeth. The toothed groove 45 and the limiting teeth form a circumferential engagement, allowing each structure to slide along the axial direction of the main shaft 8, and preventing relative circumferential rotation. Therefore, when the main shaft 8 rotates, it can synchronously drive the first bushing structure 6, the second bushing structure 7, all connecting structures 10 and the stirring blade fixing structure 9 to rotate, so that the stirring blade 31 can achieve synchronous stirring, ensuring smooth and slip-free transmission of stirring power and improving stirring stability.

[0031] Spacing adjustment principle: The mounting cylinder 29 of the stirring blade fixing structure 9 is designed with multiple length specifications. The spacing between two adjacent stirring blades 31 is determined by the length of the mounting cylinder 29. According to the stirring requirements of coal gangue particle size and slurry solid content, different length specifications of mounting cylinder 29 are selected. After the assembled stirring blade fixing structure 9 is mounted on the main shaft 8, the spacing between adjacent stirring blades 31 changes synchronously with the length of the mounting cylinder 29, realizing flexible adjustment of the stirring blade spacing. For coarse-particle coal gangue slurry, a longer mounting cylinder can be selected to increase the spacing and improve the material turning ability, while for fine-particle slurry, a shorter mounting cylinder can be selected to decrease the spacing and improve the homogenization effect.

[0032] Helical angle adjustment principle: The inner wall of the mounting cylinder 29 of the stirring blade fixing structure 9 is smooth and can rotate freely on the main shaft 8, providing a basis for adjusting the helical angle of the stirring blade; the connecting plate 38 of the connecting structure 10 can slide along the connecting cylinder 34 and rotate. The insertion rod 41 on one side is inserted into the third positioning hole 33 of the stirring blade fixing structure 9 for positioning. When the locking bolt 36 is not tightened, the connecting plate 38 can drive the stirring blade fixing structure 9 to rotate synchronously. After adjusting to the preset helical angle, tighten the locking bolt 36. Its end pushes the connecting plate 38 close to the positioning plate 35, so that the second positioning toothed plate 39 and the first positioning toothed plate 37 are tightly engaged to form a circumferential engagement, which restricts the rotation of the connecting plate 38 and the stirring blade fixing structure 9, and achieves precise locking and fixing of the helical angle.

[0033] Meanwhile, the device achieves axial pushing and pulling of the main shaft 8 through the pull structure, and with the sliding separation of the sliding bushing 13, the connecting structure 10 and the stirring blade fixing structure 9 can be quickly disassembled and replaced, simplifying the adjustment process and improving on-site operation efficiency.

[0034] Main shaft protection principle: The main shaft 8 inside the U-shaped mixing tank 2 is seamlessly enclosed by the sliding bushing 13 of the first bushing structure 6, the second turntable 20 of the second bushing structure 7, the mounting cylinder 29 of the mixing blade fixing structure 9, and the annular cover 46 of the connecting structure 10, so that the outer wall of the main shaft 8 does not come into direct contact with the hard coal gangue particles. During the mixing process, the coal gangue particles only come into contact with the protective structures such as the mixing blade 31, the mounting cylinder 29, and the annular cover 46, avoiding direct wear and deformation of the main shaft 8, effectively protecting the structural integrity of the main shaft, and improving the service life of the main shaft and the stability of equipment operation.

[0035] In addition, the locking bolt 36 of the connecting structure 10 is embedded in the groove 42 to prevent the nut from directly colliding and rubbing with the coal gangue particles, and to prevent the connection from loosening due to damage to the nut, thereby further improving the durability and stirring stability of the device.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slurry homogenization and mixing device for filling coal gangue overburden separation layer, characterized in that: The system includes an outer shell structure (1), a main shaft (8), a first bushing structure (6), a second bushing structure (7), a connecting structure (10), and a stirring blade fixing structure (9). The outer shell structure (1) consists of a U-shaped stirring tank (2), a first end cap (3), and a second end cap (4). The first end cap (3) and the second end cap (4) are respectively fixedly welded to both ends of the U-shaped stirring tank (2). The first bushing structure (6) is rotatably mounted on the first end cap (3) via bearings, and the second bushing structure (7) is rotatably mounted on the second end cap (4) via bearings. The main shaft (8) is located inside the U-shaped stirring tank (2) and its two ends are fixed by the first bushing structure (6) and the second bushing structure (7). Several stirring blade fixing structures (9) are slidably mounted on the main shaft (8). Adjacent stirring blade fixing structures (9) are fixedly connected to each other via the connecting structure (10), as are the first bushing structure (6), the second bushing structure (7), and their adjacent stirring blade fixing structures (9). The bottom surface of the mixing tank (2) near the second end cover (4) has a discharge port (44), and the four corners of the bottom surface are fixed with support legs (5). The outer side of the main shaft (8) is evenly provided with multiple toothed grooves (45) along the axial direction. The first bushing structure (6) includes a first turntable (11), which passes through the first end cover (3) and is rotatably connected to the first end cover (3) via a bearing. Two first limiting rings (12) are fixedly fitted on the first turntable (11), and the two first limiting rings (12) respectively fit against both sides of the first end cover (3). A slidable bushing (13) passes through the axis of the first turntable (11) and the two are slidably connected. Several limiting strips (14) are evenly fixed along the axial direction on the outer side of the slidable bushing (13). 11) A limiting groove (15) is provided on the upper part for the limiting strip (14) to pass through; the end of the sliding bushing (13) that extends into the U-shaped stirring tank (2) is fixed with a first positioning cylinder (26), and six first positioning holes (19) are evenly provided on the end face of the first positioning cylinder (26). The other end of the sliding bushing (13) is fixed with a flange (16), and the flange (16) is fixedly connected to the first turntable (11) by a long bolt (17). The side wall of the first turntable (11) is provided with a threaded hole (18) for the long bolt (17) to be screwed in. The second bushing structure (7) includes a second turntable (20), which passes through the second end cover (4) and is rotatably connected to the second end cover (4) via a bearing. Two second limiting rings (21) are fixedly fitted on the second turntable (20), and the two second limiting rings (21) respectively fit against both sides of the second end cover (4). A second positioning cylinder (27) is fixed at one end of the second turntable (20) that extends into the U-shaped stirring tank (2). Six second positioning holes (28) are evenly opened on the end face of the second positioning cylinder (27). A pulling structure for pushing and pulling the main shaft (8) is fixed at the other end of the second turntable (20). The pulling structure includes a lead screw (43) fixed to one end of the main shaft (8) and a C-shaped bracket (22) fixed to one side of the second turntable (20). A third turntable (23) runs through the side wall of the C-shaped bracket (22) and the two are rotatably connected by bearings. Two third limit rings (24) are fixedly fitted on the third turntable (23) and the two third limit rings (24) respectively fit the inner and outer sides of the C-shaped bracket (22). The third turntable (23) is fitted on the lead screw (43). A hexagonal nut (25) is fixed at one end of the third turntable (23) and the hexagonal nut (25) is screwed to the lead screw (43). The connecting structure (10) includes a connecting cylinder (34) slidably sleeved on the main shaft (8). The inner walls of the connecting cylinder (34), the second turntable (20), and the slidable bushing (13) are all uniformly fixed with limiting teeth that match the outer tooth groove (45) of the main shaft (8). A positioning disk (35) is fixedly sleeved at the center of the connecting cylinder (34). First positioning tooth disks (37) are fixed on both sides of the positioning disk (35). An annular cover (46) is fixedly sleeved on the positioning disk (35). Two connecting disks (38) are provided inside the annular cover (46). The connecting disks (38) slide and rotate on the connecting cylinder (34). The side of the connecting disk (38) facing the positioning disk (35) is fixedly... A second positioning toothed plate (39) is fixed, which can mesh with the first positioning toothed plate (37). A spring (40) sleeved on the connecting cylinder (34) is provided between the connecting plate (38) and the positioning plate (35). Six insert rods (41) are evenly fixed on the other side of the connecting plate (38). Several locking bolts (36) are screwed on both sides of the annular cover (46). The annular cover (46) has a groove (42) on both sides for the locking bolts (36) to be screwed on and for the nuts to be embedded. When the locking bolts (36) are tightened, their ends can push the connecting plate (38) closer to the positioning plate (35) and make the second positioning toothed plate (39) and the first positioning toothed plate (37) fit tightly together. The stirring blade fixing structure (9) includes a mounting cylinder (29) that is slidably sleeved on the main shaft (8). The inner wall of the mounting cylinder (29) is smooth and can rotate on the main shaft (8). Both ends of the mounting cylinder (29) are fixed with a third positioning cylinder (32). Six third positioning holes (33) are evenly opened on the end face of the third positioning cylinder (32). The opening positions of the six third positioning holes (33), the second positioning hole (28) and the first positioning hole (19) are all matched with the setting positions of the six insertion rods (41) of the connecting structure (10). The insertion rods (41) can be inserted into the first positioning hole (19), the second positioning hole (28) and the third positioning hole (33) to achieve positioning connection.

2. The slurry homogenization and mixing device for coal gangue overburden separation backfilling according to claim 1, characterized in that: A stirring blade fixing rod (30) is fixed at the center of the outer side of the mounting cylinder (29), and a stirring blade (31) is fixedly installed on the stirring blade fixing rod (30) by bolts; the mounting cylinder (29) has a multi-specification length structure, and the mounting cylinder (29) of the appropriate length can be selected according to the spacing requirements of two adjacent stirring blades (31).

3. The slurry homogenization and mixing device for coal gangue overburden separation backfilling according to claim 1, characterized in that: The third positioning cylinder (32) of the stirring blade fixing structure (9) can be inserted into the annular cover (46) of the connecting structure (10) and sleeved on the connecting cylinder (34), and the end of the mounting cylinder (29) can fit against the side wall of the annular cover (46).

4. The slurry homogenization and mixing device for coal gangue overburden separation backfilling according to claim 1, characterized in that: The main shaft (8) inside the U-shaped stirring tank (2) is protected by the sliding bushing (13) of the first bushing structure (6), the second turntable (20) of the second bushing structure (7), the mounting cylinder (29) of the stirring blade fixing structure (9), and the annular cover (46) of the connecting structure (10); one end of the main shaft (8) can pass through the sliding bushing (13) and be connected to an external drive motor.

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