A bauxite pretreatment apparatus and method

Abstract

This invention provides a bauxite pretreatment device and method. The device includes: a frame; a crushing mechanism disposed on the top of the frame to crush the bauxite; a processing tank disposed between and movably connected to the frame, the processing tank containing a fine crushing mechanism for further crushing the bauxite after crushing by the crushing mechanism; an adjusting mechanism disposed within the processing tank for adjusting the particle size of the finely crushed bauxite; and a screening mechanism disposed between the processing tank and the frame to screen the finely crushed bauxite. According to this invention, the bauxite is first crushed into small pieces by the crushing mechanism, and then further crushed by the fine crushing mechanism within the processing tank to achieve the required particle size. Simultaneously, the adjusting mechanism dynamically adjusts the fine crushing mechanism during the crushing and pulverizing process, gradually achieving the required particle size to improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of proppant production equipment technology, specifically to a bauxite pretreatment device and method. Background Technology

[0002] Bauxite is used as a raw material for the production of ceramsite proppant. Because natural bauxite contains alumina with water of crystallization, as well as a large amount of iron oxide impurities and water of crystallization, a large amount of moisture is generated during the processing of bauxite, which affects the quality and efficiency of crushing. Bauxite is mostly in block form when mined. To remove the water of crystallization and iron oxide impurities from bauxite, it is usually necessary to crush the bauxite to improve the removal efficiency of iron oxide impurities and water of crystallization.

[0003] In existing technologies, bauxite is usually crushed using a combination of jaw crusher and hammer crusher. First, the jaw crusher is used to break larger pieces of bauxite into smaller pieces. Then, the smaller pieces of bauxite are conveyed to the hammer crusher for secondary crushing via a conveying mechanism. After a certain period of time, the bauxite that meets the particle size requirements is screened by a screening device. Bauxite that does not meet the particle size requirements continues to be crushed in the hammer crusher.

[0004] Because bauxite contains a large amount of crystal water and iron oxide impurities, repeated crushing by a hammer crusher can easily cause a large number of pores and cracks to appear inside the bauxite, thereby affecting the production efficiency of bauxite proppant. Therefore, this invention studies and designs a bauxite pretreatment device and method. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that affect the production efficiency of bauxite treatment devices with granular sand proppant, thereby providing a bauxite pretreatment device and method.

[0006] To address the above problems, the present invention provides a bauxite pretreatment apparatus, comprising:

[0007] Frame;

[0008] A crushing mechanism is installed at the top of the frame to crush bauxite;

[0009] A processing tank is disposed between the frames and movably connected to the frames. A fine crushing mechanism is provided inside the processing tank. The fine crushing mechanism is used to finely crush the bauxite after it has been crushed by the crushing mechanism.

[0010] An adjustment mechanism is provided inside the processing tank, and the adjustment mechanism is used to adjust the particle size of the fine crushing mechanism;

[0011] A screening mechanism is installed between the processing tank and the frame to screen the finely crushed bauxite;

[0012] A control device is connected to the crushing mechanism, the fine crushing mechanism, the screening mechanism, and the adjustment mechanism, which respectively perform crushing, fine crushing, screening, and adjustment of the particle size of the fine crushing mechanism.

[0013] Preferably, the crushing mechanism is a jaw crusher, and a first mounting plate is provided on the frame, the first mounting plate is provided with a mounting opening, and the jaw crusher is disposed in the mounting opening;

[0014] A collection cylinder is also provided below the installation port. One end of the collection cylinder is connected to the installation port, and the other end of the collection cylinder extends to the top of the processing tank. An electric slide valve is provided on the collection cylinder, and the electric slide valve is connected to the control device.

[0015] Preferably, the processing tank is a horizontal tank, with gaps between the two ends of the processing tank and the two ends of the frame, and gaps between the front and rear sides of the processing tank and the frame, which are movably connected; a feed cylinder is provided at the top of the processing tank near the collecting cylinder, and the feed cylinder is located at the bottom of the collecting cylinder; a plurality of screening holes are evenly provided on the bottom sidewall of the processing tank.

[0016] The bottom of the frame is also equipped with a receiving bin.

[0017] Preferably, the screening mechanism includes: a first vertical plate and a second vertical plate, the first vertical plate and the second vertical plate are respectively disposed at both ends of the processing tank, and L-shaped strips are respectively connected to both ends of the first vertical plate and the second vertical plate. One long side of the L-shaped strip is connected to both ends of the first vertical plate and the second vertical plate, and the short side of the L-shaped strip is perpendicularly connected to the outer wall of the processing tank.

[0018] The second upright plate is provided with a rotating shaft near the frame. One end of the rotating shaft is perpendicularly connected to the long side of the second upright plate, and the other end is rotatably connected to the frame.

[0019] A second mounting plate is provided at the bottom of the frame near the first upright plate. An electric cylinder is provided on the first upright plate near the frame. The fixed end of the electric cylinder is rotatably connected to the second mounting plate, and the telescopic end of the electric cylinder is rotatably connected to the two L-shaped strips of the first upright plate. The electric cylinder is connected to the control device.

[0020] Preferably, the crushing mechanism includes: a mounting column, which is horizontally disposed at the center of the processing tank, and the two ends of the mounting column respectively rotatably penetrate the two ends of the processing tank; a connecting rod is disposed at the center of the two ends of the mounting column respectively, and the two ends of the connecting rod respectively rotatably penetrate the first vertical plate and the second vertical plate.

[0021] Inside the processing tank, at least three arc-shaped plates are evenly arranged around the mounting column, with the center of the arc-shaped plates coinciding with the central axis of the mounting column, and a gap is provided between two adjacent arc-shaped plates; multiple first crushing teeth are evenly arranged on the inner sidewall of the processing tank, and multiple second crushing teeth are arranged on the side of the arc-shaped plates near the processing tank;

[0022] The mounting column is located inside the processing tank and multiple sets of support mechanisms are evenly arranged along the axial direction of the mounting column. Each set of support mechanisms has at least three units evenly arranged with the central axis of the mounting column as the center. One end of the support mechanism is connected to the outer wall of the mounting column, and the other end is connected to the side of the arc plate facing the mounting column.

[0023] Preferably, the connecting rod of the second upright plate is provided with a first pulley away from the mounting column, and a third mounting plate is provided at one end near the second upright plate. A first motor is provided on the third mounting plate, the output shaft of the first motor is connected to a second pulley, a belt ring is sleeved between the second pulley and the first pulley, and the first motor is connected to the control device.

[0024] Preferably, each side of the arc-shaped plate is provided with a pair of extensions close to an adjacent arc-shaped plate, and a first mounting rod is provided between the pair of extensions. Multiple rotating blocks are uniformly arranged in a linear array along the length of the first mounting rod. One end of each rotating block is rotatably connected to the first mounting rod, and the other end extends toward an adjacent arc-shaped plate.

[0025] The rotating block has a pair of protrusions at one end away from the first mounting rod, with a gap between the pair of protrusions. A second mounting rod is also provided between two adjacent arc-shaped plates, and the protrusions of the rotating block and the second mounting rod are rotatably connected between the two adjacent arc-shaped plates.

[0026] Preferably, the support mechanism includes: a sliding sleeve and a sliding bar. One end of the sliding sleeve is connected to the outer wall of the mounting column, and the other end of the sliding sleeve extends towards the arc-shaped plate along the radial direction of the mounting column. The sliding bar is disposed inside the sliding sleeve and slidably connected to the sliding sleeve. One end of the sliding bar is connected to the arc-shaped plate, and the other end is provided with a sliding groove. A sliding rod is provided at the end of the sliding sleeve away from the sliding bar, and a spring is provided on the sliding rod. One end of the spring abuts against the end of the sliding groove away from the sliding bar, and the other end abuts against the sliding bar.

[0027] Preferably, two adjustment mechanisms are provided relative to the support mechanisms at both ends of the processing tank;

[0028] The adjustment mechanism includes a mounting ring and a transmission ring. The mounting ring is disposed on the mounting post near the sliding sleeve, and the mounting ring and the mounting post are rotatably connected. An arc-shaped strip is disposed on the outer side of the mounting ring with the mounting post as the center, corresponding to the adjacent sliding strip. One end of the arc-shaped strip is connected to the outer side of the mounting ring, and the other end extends outward in a spiral shape. An arc-shaped sliding hole is disposed on the arc-shaped strip, and a limit rod is disposed on the sliding strip corresponding to each arc-shaped strip. One end of the limit rod is connected to the sliding strip, and the other end extends into the corresponding arc-shaped sliding hole and is slidably connected to the arc-shaped sliding hole.

[0029] The transmission ring is provided at one end of the mounting ring near the sliding sleeve. The transmission ring and the mounting post are spaced apart, and multiple teeth are evenly arranged on the outer side of the transmission ring.

[0030] A pair of fixing plates are provided on the outer wall of the mounting column along the axial direction of the mounting column. A rotating shaft is provided between the pair of fixing plates. The rotating shaft and the pair of fixing plates are rotatably connected. Both ends of the rotating shaft extend through the fixing plates to the two adjustment mechanisms. A first gear is provided at both ends of the rotating shaft. The first gear meshes with the teeth of the corresponding transmission ring.

[0031] A first bevel gear is also provided on the rotating shaft, and a second motor is provided on the mounting post near the first bevel gear. The output shaft of the second motor is connected to the second bevel gear, the second bevel gear extends toward the first bevel gear and meshes with the first bevel gear, and the second motor is connected to the control device.

[0032] The present invention also provides a bauxite pretreatment method, comprising the bauxite pretreatment apparatus as described in any of the preceding claims, including the following steps:

[0033] S1: Larger pieces of bauxite are transported to the crushing mechanism, which first crushes the bauxite into smaller pieces before transporting them to the processing tank.

[0034] S2: The control device controls the fine crushing mechanism to further crush and finely grind small pieces of bauxite, and dynamically adjusts the fine crushing mechanism to meet the fine crushing requirements;

[0035] S3: The processing tank is assisted by an intermittent start-stop screening mechanism to screen out bauxite that meets the particle size requirements. Bauxite that does not meet the particle size requirements is further crushed in the processing tank. The particle size of the crushing mechanism is readjusted so that it gradually meets the particle size requirements.

[0036] The bauxite pretreatment apparatus and method provided by this invention have the following beneficial effects:

[0037] 1. The present invention first crushes bauxite into small pieces using a crushing mechanism, and then further crushes and finely grinds it using a fine crushing mechanism in the processing tank to make it meet the particle size requirements of bauxite. At the same time, the adjusting mechanism dynamically adjusts the fine crushing mechanism during the fine crushing process to gradually meet the particle size requirements, thereby improving production efficiency.

[0038] 2. The present invention also uses a screening mechanism to assist in screening the bauxite in the processing tank during the crushing process. When bauxite of different particle sizes are crushed during the crushing process, the screening mechanism assists in screening so that bauxite that meets the particle size requirements is screened out of the processing tank, while bauxite that does not meet the particle size requirements is further crushed in the processing tank, thereby further improving production efficiency.

[0039] 3. The present invention also involves a rotating block between two adjacent arc-shaped plates. As the distance between the arc-shaped plates and the inner wall of the processing tank is adjusted, when the maximum distance between the arc-shaped plates and the processing tank is required, the rotating block between the two adjacent arc-shaped plates is folded and its extensions abut against each other, with one end near the second rotating rod extending outward. In this structure, the gap between the first and second crushing teeth is larger, which can process bauxite with a larger particle size. The length of the folded part of the two rotating blocks is greater than the height of the second crushing tooth. As it rotates with the mounting column, it can carry the bauxite to rotate, which can homogenize the bauxite inside the processing tank. It can move the bauxite with a larger particle size to rotate inside the processing tank, forming multiple dividing plates. The bauxite between each dividing plate is carried to the screening hole as the arc-shaped plate rotates relative to the processing tank. The bauxite that meets the particle size requirement flows out of the processing tank through the screening hole, while the bauxite that does not meet the particle size requirement continues to rotate, so that the bauxite in each dividing plate that meets the particle size requirement is sent out of the processing tank.

[0040] 4. The present invention also extends the rotating block between two adjacent arc plates when the minimum distance between the arc plate and the processing tank is required, so that the two first mounting rods and the second mounting rods of the two adjacent arc plates are on the same plane, and the rotating blocks connected to them are also parallel. In this way, the second crushing tooth can extend relative to the first crushing tooth with the minimum distance, thereby performing fine crushing of smaller particle size. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural diagram of the overall assembly of the present invention;

[0042] Figure 2 This is a front view structural diagram of the present invention;

[0043] Figure 3 This is a schematic diagram of the feed cylinder structure installation of the present invention;

[0044] Figure 4This is a schematic diagram of the installation of the first pulley structure of the present invention;

[0045] Figure 5 This is a schematic diagram of the sieve hole structure installation of the present invention;

[0046] Figure 6 This is a schematic diagram of the installation of the arc-shaped plate structure of the present invention;

[0047] Figure 7 This is a schematic diagram of the installation of the protruding structure of the present invention;

[0048] Figure 8 This is a schematic diagram of the installation of the sliding groove structure of the present invention;

[0049] Figure 9 This is a schematic diagram of the installation of the first bevel gear structure of the present invention.

[0050] The reference numerals in the attached figures are as follows:

[0051] 1. Frame; 2. Processing tank; 3. Jaw crusher; 4. First mounting plate; 5. Collection cylinder; 6. Electric slide gate valve; 7. Feed cylinder; 8. Screening hole; 9. Receiving bin; 10. First vertical plate; 11. Second vertical plate; 12. L-shaped bar; 13. Rotating shaft; 14. Second mounting plate; 15. Electric cylinder; 16. Mounting column; 17. Connecting rod; 18. Arc plate; 19. First crushing tooth; 20. Second crushing tooth; 22. Third mounting plate; 23. First motor; 24. First pulley; 25. 16. Belt ring; 27. Extension; 28. First mounting rod; 29. ​​Rotating block; 30. Protrusion; 31. Second mounting rod; 32. Sliding sleeve; 33. Sliding strip; 34. Sliding groove; 35. Sliding rod; 36. Spring; 37. Mounting ring; 38. Transmission ring; 39. Arc-shaped strip; 40. Arc-shaped sliding hole; 41. Limiting rod; 42. Tooth; 43. Fixing plate; 44. Rotating shaft; 45. First bevel gear; 46. Second motor; 47. Second bevel gear; 48. Heating duct. Detailed Implementation

[0052] like Figure 1-9 As shown, the present invention provides a bauxite pretreatment apparatus, which includes:

[0053] A frame 1; a crushing mechanism, located at the top of the frame 1, for crushing bauxite; a processing tank 2, located between and movably connected to the frame 1, the processing tank 2 containing a fine crushing mechanism for further crushing the bauxite after crushing by the crushing mechanism; an adjusting mechanism, located within the processing tank 2, for adjusting the particle size of the finely crushed material; a screening mechanism, located between the processing tank 2 and the frame 1, for screening the finely crushed bauxite; and a control device, connected to the crushing mechanism, fine crushing mechanism, screening mechanism, and adjusting mechanism, for crushing, finely crushing, screening, and adjusting the particle size of the finely crushed material. Figure 1-9 As shown, a bauxite pretreatment device has a frame 1 that houses various mechanisms. A belt conveyor transports larger pieces of bauxite to a crushing mechanism, which first crushes the bauxite into smaller pieces. Then, a fine crushing mechanism within a treatment tank 2 further finely crushes the bauxite to obtain bauxite that meets the particle size requirements. Simultaneously, an adjustment mechanism dynamically adjusts the fine crushing mechanism during the crushing and pulverizing process, gradually adjusting it to achieve the required particle size and improve production efficiency. A screening mechanism assists in screening the bauxite in the treatment tank during the fine crushing process. When faced with bauxite of different particle sizes during crushing, the screening mechanism helps to separate bauxite that meets the required particle size from the treatment tank, while bauxite that does not meet the size requirements is further finely crushed within the treatment tank, thereby further improving production efficiency. A control device controls the crushing, fine crushing, screening, and adjustment of the fine crushing mechanism's particle size.

[0054] In some embodiments, the crushing mechanism is a jaw crusher 3, and a first mounting plate 4 is provided on the frame 1. The first mounting plate 4 has an installation opening, and the jaw crusher 3 is installed in the installation opening. A collection cylinder 5 is also provided below the installation opening. One end of the collection cylinder 5 is connected to the installation opening, and the other end of the collection cylinder 5 extends towards the top of the processing tank 2. An electric slide gate valve 6 is provided on the collection cylinder 5, and the electric slide gate valve 6 is connected to the control device. Figure 1-9As shown, the crushing mechanism is a jaw crusher 3, which is commercially available. The jaw crusher 3 is connected to a control device, which controls the jaw crusher to crush larger pieces of bauxite into smaller pieces. The frame 1 and the first mounting plate 4 can be connected by bolts. The jaw crusher 3 is installed at the mounting opening, so that after the larger pieces of bauxite are crushed by the jaw crusher 3, they flow through the mounting opening to the collection cylinder 5. A buffer pad is set at the connection between the edge of the mounting opening and the jaw crusher 3 to reduce the vibration of the jaw crusher 3 at the mounting opening. The collection cylinder 5 is frustum-shaped, with a larger cross-section at the end near the mounting opening, which facilitates the collection of smaller pieces of bauxite after crushing, making it easier for them to fall into the processing tank 2 below for further crushing. The electric slide valve 6 is commercially available and is controlled by the control device to open or close, so as to supply the bauxite to be crushed into the processing tank 2.

[0055] In some embodiments, the processing tank 2 is a horizontal tank, with gaps between its two ends and the two ends of the frame 1, and gaps between the front and rear sides of the processing tank 2 and the frame 1, which are movably connected; a feed cylinder 7 is located at the top of the processing tank 2 near the collecting cylinder 5, and the feed cylinder 7 is located at the bottom of the collecting cylinder 5; multiple screening holes 8 are evenly arranged on the bottom sidewall of the processing tank 2; and a receiving bin 9 is also provided at the bottom of the frame 1. Figure 1-9 As shown, the processing tank 2 is a horizontal tank with a circular radial cross-section. Gaps are maintained between the front and rear sides and both ends of the processing tank 2 and the frame 1 to facilitate the movement of the screening mechanism. The front and rear sides of the processing tank 2 are movably connected to the frame 1. The feed cylinder 7 is installed at the top of the processing tank 2 near the collecting cylinder 5. It is truncated square in shape, with one end closer to the processing tank 2 having a larger cross-section than the other end. The feed cylinder 7 extends outwards to catch the bauxite from the collecting cylinder 5, and also catches any bauxite splashed outwards during the feeding process. Sufficient gaps are maintained between the feed cylinder 7 and the collecting cylinder 5 to prevent collisions between them during the screening process. The bottom sidewall of the processing tank 2 is uniformly provided with multiple screening holes 8. The diameter of the screening holes 8 is determined according to the requirements of the proppant. This can be a split design, with a corresponding assembly port set at the bottom of the processing tank. The assembly plate with the same shape as the bottom of the processing tank is installed in the installation port by snap-fit, bolt connection. Multiple screening holes with different diameters are respectively set on different assembly plates. The corresponding assembly plate is selected according to the requirements of the proppant to achieve the required diameter of the finely crushed bauxite. The receiving bin 9 at the bottom of the frame 1 is used to collect the bauxite that meets the particle size requirements. A belt conveyor can be set in the receiving bin 9 to transport the collected bauxite that meets the particle size requirements to the next process for ball milling.

[0056] In some embodiments, the screening mechanism includes: a first vertical plate 10 and a second vertical plate 11, the first vertical plate 10 and the second vertical plate 11 being respectively disposed at both ends of the processing tank 2, and L-shaped strips 12 being connected to both ends of the first vertical plate 10 and the second vertical plate 11 respectively. One long side of the L-shaped strip 12 is connected to both ends of the first vertical plate 10 and the second vertical plate 11, and the short side of the L-shaped strip 12 is perpendicularly connected to the outer wall of the processing tank 2; a rotating shaft 13 is disposed near the frame 1 on the second vertical plate 11, one end of the rotating shaft 13 is perpendicularly connected to the long side of the second vertical plate 11, and the other end is rotatably connected to the frame 1; a second mounting plate 14 is disposed at the bottom of the side of the frame 1 near the first vertical plate 10, and an electric cylinder 15 is disposed near the frame 1 on the first vertical plate 10. The fixed end of the electric cylinder 15 is rotatably connected to the second mounting plate 14, and the telescopic end of the electric cylinder 15 is rotatably connected to the first vertical plate 10. The electric cylinder 15 is connected to the control device. Figure 1-9 As shown, the first upright plate 10 and the second upright plate 11 are installed opposite each other at both ends of the processing tank 2. L-shaped strips 12 are connected to both ends of the first upright plate 10 and the second upright plate 11, respectively. The long side of the L-shaped strip 12 is connected to both ends of the first upright plate 10 and the second upright plate 11, and its short side is vertically connected to the outer wall of the processing tank 2. One side of the second upright plate 11 is connected to the frame 1 via a rotating shaft 13, allowing the processing tank 2 to be finely rotated relative to the frame 1 with the rotating shaft 13 as the center. One side of the first upright plate 10 is connected via two electric cylinders 15. The electric cylinders 15 are commercially available. The fixed end of the electric cylinder 15 is rotatably connected to the second mounting plate 14 via a rotating seat. The telescopic end of the electric cylinder 15 is rotatably connected to the two L-shaped strips 12 of the first upright plate 10 via a rotating seat. The rotating seat is used for relative adjustment of the electric cylinder and the second mounting plate. When the processing tank 2 is finely adjusted with the rotating shaft 13 as the axis, the electric cylinder... The cylinder 15 can be finely adjusted in angle under the action of the rotating seat to meet the telescopic movement of the electric cylinder 15; the electric cylinder 15 is controlled by the control device to perform synchronous telescopic movement, so that the processing tank 2 adjusts its angle around the rotating shaft 13 as the center, and the processing tank 2 shakes up and down relative to each other, so that the bauxite of different particle sizes inside the processing tank 2 is homogenized and the bauxite that meets the required particle size flows out of the processing tank 2 through the screening hole 8, so as to further crush the bauxite that does not meet the particle size requirement inside; wherein, the screening mechanism can be started intermittently, and the screening is started after a certain period of time, or the distance between the first crushing tooth 19 and the second crushing tooth 20 is set. When the distance is large, the time interval between the start of the screening mechanism is large, and when the distance is small, the time interval between the start of the screening mechanism is small, so as to screen out the bauxite that meets the particle size requirement inside the processing tank.

[0057] In some embodiments, the crushing mechanism includes: a mounting column 16, which is horizontally positioned at the center of the processing tank 2, with both ends of the mounting column 16 rotatably penetrating both ends of the processing tank 2; a connecting rod 17 is respectively provided at the center of both ends of the mounting column 16, and both ends of the connecting rod 17 rotatably penetrating the first vertical plate 10 and the second vertical plate 11; at least three arc-shaped plates 18 are evenly arranged inside the processing tank 2 with the mounting column 16 as the center, the center of the arc-shaped plates 18 coinciding with the central axis of the mounting column 16, and adjacent... A gap is provided between the two arc-shaped plates 18; a plurality of first crushing teeth 19 are evenly arranged on the inner sidewall of the processing tank 2, and a plurality of second crushing teeth 20 are arranged on the side of the arc-shaped plate 18 near the processing tank 2; a plurality of sets of support mechanisms are evenly arranged along the axial direction of the mounting column 16 inside the processing tank 2, and at least three of each set of support mechanisms are evenly arranged with the central axis of the mounting column 16 as the center; one end of the support mechanism is connected to the outer sidewall of the mounting column 16, and the other end is connected to the side of the arc-shaped plate 18 facing the mounting column 16. Figure 1-9 As shown, the mounting column 16 is rotatably arranged relative to the processing tank 2. The two ends of the mounting column 16 extending out of the processing tank 2 are rotatably connected to the first vertical plate 10 and the second vertical plate 11 via a connecting rod 17 installed at the center. At least three arc-shaped plates 18 are installed inside the processing tank 2 with the mounting column 16 as the center. The center of each arc-shaped plate 18 coincides with the central axis of the mounting column 16. A gap is provided between adjacent arc-shaped plates 18 to facilitate the installation of the rotating block 28. Multiple first crushing teeth 19 are evenly installed on the inner wall of the processing tank 2. No first crushing teeth 19 are installed on the inner side of the screening hole 8 relative to the processing tank 2 to prevent bauxite from being crushed in the first... The blockage between the crushing tooth 19 and the screening hole 8 is caused by the arc plate 18 being provided with a second crushing tooth 20 near the inner wall of the processing tank 2. The first crushing tooth 19 and the second crushing tooth 20 are staggered, so that when the arc plate 18 gets infinitely close to the inner wall of the processing tank 2, part of the second crushing tooth 20 extends into the space between the first crushing teeth 19, compressing the fine crushing space, so that it can achieve the fine crushing requirement of smaller particle size. Multiple sets of support mechanisms support the arc plate 18 to meet the requirements of the fine crushing mechanism, so that small pieces of bauxite can be finely crushed through the arc plate 18 and the inner wall of the processing tank 2.

[0058] In some embodiments, a first pulley 24 is provided on the connecting rod 17 of the second upright plate 11 away from the mounting post 16, and a third mounting plate 22 is provided at one end near the second upright plate 11. A first motor 23 is provided on the third mounting plate 22, and the output shaft of the first motor 23 is connected to a second pulley. A belt ring 25 is sleeved between the second pulley and the first pulley 24. The first motor 23 is connected to the control device. Figure 1-9As shown, the first motor 23 is commercially available. The state and parameters of the first motor 23 are controlled by a control device. The output shaft of the first motor 23 and the second pulley can be connected by a coupling to the output shaft of the first motor and a rotating rod. The rotating rod is then connected to the second pulley, so that the first motor 23 drives the second pulley. Since the first pulley 24 and the second pulley are connected by a belt ring 25, the rotation of the first pulley 24 drives the connecting rod 17 to rotate, so that the mounting column 16 rotates relative to the processing tank 2. During its rotation, the second crushing tooth 20 rotates relative to the processing tank 2, so that it further crushes and finely pulverizes the bauxite. At the same time, the second crushing tooth 20 will drive some of the bauxite stuck between the first crushing tooth 19 and the second crushing tooth 20 to rotate with it.

[0059] In some embodiments, a pair of extensions 26 are provided on each side of the arc-shaped plate 18 near an adjacent arc-shaped plate 18. A first mounting rod 27 is provided between the pair of extensions 26. A plurality of rotating blocks 28 are uniformly arranged in a linear array along the length of the first mounting rod. One end of each rotating block 28 is rotatably connected to the first mounting rod 27, and the other end extends toward an adjacent arc-shaped plate 18. A pair of protrusions 29 are provided at the end of each rotating block 28 away from the first mounting rod 27. A gap is provided between the pair of protrusions 29. A second mounting rod 30 is also provided between two adjacent arc-shaped plates 18. The protrusions 29 of the rotating block 28 between two adjacent arc-shaped plates 18 are rotatably connected to the second mounting rod 30. Figure 1-9 As shown, the extension 26 extends from both sides of the arc plate 18 toward an adjacent arc plate 18, and the center of the extension 26 also overlaps with the center of the mounting post 16. When the arc plate 18 is adjusted by the adjustment mechanism, the extension 26 between two adjacent arc plates 18 acts as a limit to prevent further folding of the two rotating blocks 28. A first mounting rod 27 is installed between each pair of first extensions 26, and the rotating blocks 28 are linearly arrayed and rotatably connected on the first mounting rod 27. The rotating blocks 28 between two adjacent arc plates 18 are rotatably connected via a second mounting rod 30. The two protrusions 29 of the moving block 28 have the same width, and the width of each protrusion 29 is 1 / 4 of the width of the entire rotating block 28. Each protrusion 29 has a gap from its two sides to the rotating block 28, which is 1 / 8 of the width of the entire rotating block 28. The distance between the two protrusions 29 is 1 / 4 of the width of the entire rotating block 28. In this way, when two adjacent rotating blocks 28 are connected to the second mounting rod 30, they can maintain a tight engagement when the relative angle of the two rotating blocks 28 is adjusted, which can reduce the amount of bauxite between the arc plate 18 and the treatment tank 2 entering the side where the mounting column 16 is located.

[0060] Specifically, in the adjustment of the distance between the arc-shaped plates 18 and the inner wall of the processing tank 2, when the maximum distance between the arc-shaped plates 18 and the processing tank 2 is required, the rotating block 28 between the two adjacent arc-shaped plates 18 is folded and its extension 26 abuts against each other, with one end near the second rotating rod extending outward. At this time, in the resulting structure, the gap between the first crushing tooth 19 and the second crushing tooth 20 is larger, which can process bauxite with a larger particle size, and the length of the folded part of the two rotating blocks 28 extending outward is greater than that of the second crushing tooth 20. The height of the plate is 0. As the mounting column 16 rotates, it can carry the bauxite along with it, which can homogenize the bauxite inside the treatment tank 2. At the same time, it can move the bauxite with larger particle size to rotate inside the treatment tank 2, forming multiple dividing plates. The bauxite between each dividing plate is carried to the screening hole 8 as the arc plate rotates relative to the treatment tank. The bauxite that meets the particle size requirement flows out of the treatment tank 2 through the screening hole 8, while the bauxite that does not meet the particle size requirement continues to rotate, so that the bauxite in each dividing plate that meets the particle size requirement is sent out of the treatment tank 2.

[0061] Specifically, when the minimum distance between the arc plate 18 and the processing tank 2 is required, the rotating block 28 between two adjacent arc plates 18 is stretched apart, so that the two first mounting rods 27 and the second mounting rods 30 of the two adjacent arc plates 18 are on the same plane, and the rotating block 28 connected to them is also parallel. In this way, the second crushing tooth 20 can extend relative to the first crushing tooth 19 with the minimum distance, so as to perform fine crushing of smaller particle size.

[0062] Specifically, a plurality of warm air pipes 48 are provided at one end of the processing tank 2 near the first vertical plate 10. The warm air pipes 48 are located near the mounting column 16 and are spaced apart from the first vertical plate 10. One end of the warm air pipe 48 extends through the end of the processing tank and into the space between the mounting column 16 and the arc plate 18 inside the processing tank 2. The other end of the warm air pipe 48 is connected to a waste heat recovery pipe to recover and transport the waste heat generated during the production process in the plant to the processing tank 2 for use in the bauxite pretreatment device. The warm air entering the space between the arc plate 18 and the mounting column passes through the gap between the rotating blocks between adjacent arc plates to the first crushing tooth and the second crushing tooth. The flow between the teeth allows warm air to be supplied during the fine crushing of bauxite, forming a warm air distribution from the mounting column towards the inner wall of the processing tank. This warm air dries the moisture that appears during the fine crushing of bauxite. The warm air that enters between the first and second crushing teeth is finally discharged from the tank through the feed cylinder at the top and the screening hole at the bottom. During this process, the warm air that diffuses from the mounting column towards the inner wall of the processing tank blows away small particles during the fine crushing process of the first and second crushing teeth, preventing them from clogging the gap between the rotating block and the arc plate, affecting the adjustment of the arc plate and the rotating block, and preventing them from entering the space between the mounting column and the arc plate.

[0063] In some embodiments, the support mechanism includes a sliding sleeve 31 and a sliding strip 32. One end of the sliding sleeve 31 is connected to the outer wall of the mounting post 16, and the other end of the sliding sleeve 31 extends radially toward the arc-shaped plate 18 along the mounting post 16. The sliding strip 32 is disposed within the sliding sleeve 31 and slidably connected to the sliding sleeve 31. One end of the sliding strip 32 is connected to the arc-shaped plate 18, and the other end is provided with a sliding groove 33. A sliding rod 34 is provided at the end of the sliding sleeve 31 away from the sliding strip 32. A spring 35 is provided on the sliding rod 34. One end of the spring 35 abuts against the end of the sliding groove 33 away from the sliding strip 32, and the other end abuts against the sliding strip 32. Figure 1-9 As shown, a slide rail adapted to slide bar 32 is provided inside the sliding sleeve 31, so that the sliding sleeve 31 is slidably connected. When the adjustment mechanism is adjusted to change the distance between the arc plate 18 and the inner wall of the treatment tank 2, the sliding of slide bar 32 and sliding sleeve 31 provides support for it, so that the arc plate 18 is adjusted in the radial direction of the treatment tank 2. Spring 35 is commercially available and is made of spring steel. Spring 35 abuts between sliding groove 33 and slide bar 32 to support the position between slide bar 32 and slide rail. In this way, when adjusting the distance between arc plate 18 and inner wall of treatment tank 2, it is adjusted by multiple sets of support mechanisms.

[0064] In some embodiments, two adjustment mechanisms are provided relative to the support mechanisms at both ends of the processing tank 2; the adjustment mechanism includes: a mounting ring 36 and a transmission ring 37. The mounting ring 36 is disposed on the mounting post 16 near the sliding sleeve 31, and the mounting ring 36 and the mounting post 16 are rotatably connected. An arc-shaped strip 38 is provided on the outer side of the mounting ring 36 with the mounting post 16 as the center, corresponding to the adjacent sliding strip 32. One end of the arc-shaped strip 38 is connected to the outer side of the mounting ring 36, and the other end extends outward in a spiral shape. An arc-shaped sliding hole 39 is provided on the arc-shaped strip 38, and a limit rod 40 is provided on the sliding strip 32 corresponding to each arc-shaped strip 38. One end of the limit rod 40 is connected to the sliding strip 32, and the other end extends into the corresponding arc-shaped sliding hole 39 and is slidably connected to the arc-shaped sliding hole 39. The transmission ring 37 is disposed on the end of the mounting ring 36 near the sliding sleeve 31. The transmission ring 37 and the mounting post 16 are spaced apart, and multiple teeth 41 are evenly arranged on the outer side of the transmission ring 37; a pair of fixing plates 42 are arranged on the outer wall of the mounting post 16 along the axial direction of the mounting post 16, and a rotating shaft 43 is arranged between the pair of fixing plates 42. The rotating shaft 43 and the pair of fixing plates 42 are rotatably connected, and both ends of the rotating shaft 43 extend through the fixing plates 42 to the two adjustment mechanisms. A first gear 44 is arranged at both ends of the rotating shaft 43, and the first gear 44 meshes with the corresponding teeth 41 of the transmission ring 37; a first bevel gear 45 is also arranged on the rotating shaft 43, and a second motor 46 is arranged on the mounting post 16 near the first bevel gear 45. The output shaft of the second motor 46 is connected to a second bevel gear 47, and the second bevel gear 47 extends toward and meshes with the first bevel gear 45. The second motor 46 is connected to the control device. Figure 1-9As shown, the adjustment mechanism is installed at the support mechanisms at both ends of the treatment tank 2. The installation direction of the support mechanism at one end of the treatment tank 2 is opposite to that of the other support mechanisms to avoid interference during the installation of the adjustment mechanism. The second motor 46 is commercially available. The connection between the output shaft of the second motor 46 and the second bevel gear 47 can be achieved by connecting the output shaft of the second motor 46 to a rotating rod via a coupling, and then connecting the rotating rod to the second bevel gear 47. The second bevel gear 47 meshes with the first bevel gear 45, and the second bevel gear 47 drives the first bevel gear 45, allowing the rotating shaft rotatably connected to a pair of fixed plates 42 to rotate. Furthermore, the two ends of the rotating shaft 43 are connected to the first gear 44, which drives the transmission ring 37 that meshes with the teeth 41. Since the transmission ring 37 is installed on the mounting ring 36 facing away from both ends of the treatment tank 2... The mounting ring 36 is rotatably connected to the mounting column 16, thereby enabling transmission of the mounting ring 36. Because the arc-shaped sliding hole 39 is opened in the arc-shaped strip 38 on the outer side of the mounting ring 36, a limiting rod 40 is slidably connected. The limiting rod 40 is connected to the slide bar 32. Through the rotation of the mounting ring 36 relative to the mounting column 16, the two sets of support mechanisms near both ends achieve synchronous transmission of each slide bar 32 and slide sleeve 31 through the transmission of the rotating shaft. This provides power for the sliding of the slide bars 32 and slide sleeves 31 of the two support mechanisms located at both ends. Thus, the distance between the arc plate 18 and the inner wall of the treatment tank 2 can be synchronously adjusted by the adjustment mechanism, thereby maintaining the stability of the arc plate 18 during the adjustment process. Furthermore, the adjustment range for the distance of each arc plate 18 is consistent during the adjustment process, promoting the stability of the arc plate 18.

[0065] The present invention also provides a method for pretreating bauxite, comprising the bauxite pretreating apparatus as described in any of the preceding claims, including the following steps:

[0066] S1: Larger pieces of bauxite are transported to the crushing mechanism, which first crushes the bauxite into smaller pieces and then transports them to the processing tank 2.

[0067] S2: The control device controls the fine crushing mechanism to further crush and finely grind small pieces of bauxite, and dynamically adjusts the fine crushing mechanism to meet the fine crushing requirements;

[0068] S3: The treatment tank 2 is assisted in screening by an intermittent start-stop screening mechanism to screen out bauxite that meets the particle size requirements. Bauxite that does not meet the particle size requirements is further crushed in the treatment tank. The particle size of the crushing mechanism is readjusted so that it gradually meets the particle size requirements.

[0069] Specifically, a belt conveyor transports larger pieces of bauxite to a crushing mechanism. The crushing mechanism first breaks the bauxite into smaller pieces, and then a fine crushing mechanism inside the processing tank 2 further crushes it to meet the required particle size. The first pulley 24 rotates, causing the connecting rod 17 to rotate, which in turn causes the mounting column 16 to rotate relative to the processing tank 2. During this rotation, the second crushing tooth 20 rotates relative to the processing tank 2, further crushing the bauxite. Simultaneously, the second crushing tooth 20 also causes some bauxite stuck between the first crushing tooth 19 and the second crushing tooth 20 to rotate with it. During the fine crushing process, the adjusting mechanism dynamically adjusts the fine crushing mechanism to gradually achieve the required particle size, thereby improving production efficiency.

[0070] Specifically, in the adjustment of the distance between the arc-shaped plates 18 and the inner wall of the processing tank 2, when the maximum distance between the arc-shaped plates 18 and the processing tank 2 is required, the rotating block 28 between the two adjacent arc-shaped plates 18 is folded and its extension 26 abuts against each other, with one end near the second rotating rod extending outward. At this time, in the resulting structure, the gap between the first crushing tooth 19 and the second crushing tooth 20 is larger, which can process bauxite with a larger particle size, and the length of the folded part of the two rotating blocks 28 extending outward is greater than that of the second crushing tooth 20. The height of the plate is 0. As the mounting column 16 rotates, it can carry the bauxite along with it, which can homogenize the bauxite inside the treatment tank 2. At the same time, it can move the bauxite with larger particle size to rotate inside the treatment tank 2, forming multiple dividing plates. The bauxite between each dividing plate is carried to the screening hole 8 as the arc plate rotates relative to the treatment tank. The bauxite that meets the particle size requirement flows out of the treatment tank 2 through the screening hole 8, while the bauxite that does not meet the particle size requirement continues to rotate, so that the bauxite in each dividing plate that meets the particle size requirement is sent out of the treatment tank 2.

[0071] Specifically, when the minimum distance between the arc plate 18 and the processing tank 2 is required, the rotating block 28 between two adjacent arc plates 18 is stretched apart, so that the two first mounting rods 27 and the second mounting rods 30 of the two adjacent arc plates 18 are on the same plane, and the rotating block 28 connected to them is also parallel. In this way, the second crushing tooth 20 can extend relative to the first crushing tooth 19 with the minimum distance, so as to perform fine crushing of smaller particle size.

[0072] Specifically, the screening mechanism assists in screening the bauxite in the processing tank during the fine crushing process. When bauxite of different particle sizes is crushed, the screening mechanism adjusts the size to separate the bauxite that meets the size requirements out of the processing tank, while the bauxite that does not meet the size requirements is further crushed inside the processing tank. The control device controls the electric cylinder 15 to perform synchronous telescopic movement, causing the processing tank 2 to adjust its angle around the rotating shaft 13, resulting in relative up-and-down shaking of the processing tank 2. This ensures that the bauxite of different particle sizes inside the processing tank 2 is uniformly crushed. The process facilitates the flow of bauxite that meets the particle size requirements through the screening holes 8 out of the processing tank 2, so as to further crush the bauxite inside that does not meet the particle size requirements. The screening mechanism can be started intermittently, turning on to screen the bauxite after a certain period of time, or the interval between the screening mechanism can be set according to the distance between the first crushing tooth 19 and the second crushing tooth 20. When the distance is large, the interval between the screening mechanism starts is large, and when the distance is small, the interval between the screening mechanism starts is small, so as to screen out the bauxite that meets the particle size requirements from the processing tank.

[0073] Specifically, a slide rail adapted to the slide bar 32 is provided inside the sliding sleeve 31, so that the sliding sleeve 31 is slidably connected. When the adjustment mechanism is adjusted to change the distance between the arc plate 18 and the inner wall of the treatment tank 2, the sliding of the slide bar 32 and the sliding sleeve 31 provides support. Through the rotation of the mounting ring 36 relative to the mounting column 16, the two sets of support mechanisms near the two ends realize the synchronous transmission of each slide bar 32 and the sliding sleeve 31 through the transmission of the rotating shaft, thus realizing the power to slide the slide bar 32 and the sliding sleeve 31 of the two support mechanisms located at the two ends. In this way, the distance between the arc plate 18 and the inner wall of the treatment tank 2 can be synchronously adjusted by the adjustment mechanism.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A bauxite pretreatment device, characterized in that, include: Frame; A crushing mechanism is installed at the top of the frame to crush bauxite; A processing tank is disposed between the frames and movably connected to the frames. A fine crushing mechanism is provided inside the processing tank. The fine crushing mechanism is used to finely crush the bauxite after it has been crushed by the crushing mechanism. An adjustment mechanism is provided inside the processing tank, and the adjustment mechanism is used to adjust the particle size of the fine crushing mechanism; A screening mechanism is installed between the processing tank and the frame to screen the finely crushed bauxite; A control device is connected to the crushing mechanism, the fine crushing mechanism, the screening mechanism, and the adjustment mechanism, which respectively crush, finely crush, screen, and adjust the particle size of the fine crushing mechanism. The screening mechanism includes a first vertical plate and a second vertical plate, which are respectively disposed at both ends of the processing tank. L-shaped strips are connected to both ends of the first vertical plate and the second vertical plate. One long side of the L-shaped strip is connected to both ends of the first vertical plate and the second vertical plate, and the short side of the L-shaped strip is perpendicularly connected to the outer wall of the processing tank. The second upright plate is provided with a rotating shaft near the frame. One end of the rotating shaft is perpendicularly connected to the long side of the second upright plate, and the other end is rotatably connected to the frame. A second mounting plate is provided at the bottom of the frame near the first upright plate. An electric cylinder is provided on the first upright plate near the frame. The fixed end of the electric cylinder is rotatably connected to the second mounting plate. The telescopic end of the electric cylinder is rotatably connected to the two L-shaped strips of the first upright plate. The electric cylinder is connected to the control device. The crushing mechanism includes: a mounting column, which is horizontally positioned at the center of the processing tank, with both ends of the mounting column rotatably penetrating both ends of the processing tank; and a connecting rod is provided at the center of each end of the mounting column, with both ends of the connecting rod rotatably penetrating the first vertical plate and the second vertical plate. Inside the processing tank, at least three arc-shaped plates are evenly arranged around the mounting column, with the center of the arc-shaped plates coinciding with the central axis of the mounting column, and a gap is provided between two adjacent arc-shaped plates; multiple first crushing teeth are evenly arranged on the inner sidewall of the processing tank, and multiple second crushing teeth are arranged on the side of the arc-shaped plates near the processing tank; The mounting column is located inside the processing tank and multiple sets of support mechanisms are evenly arranged along the axial direction of the mounting column. Each set of support mechanisms has at least three evenly arranged with the central axis of the mounting column as the center. One end of the support mechanism is connected to the outer wall of the mounting column, and the other end is connected to the side of the arc plate facing the mounting column. On each side of the arc-shaped plate, a pair of extensions are provided close to an adjacent arc-shaped plate. A first mounting rod is provided between the pair of extensions. Multiple rotating blocks are uniformly arranged in a linear array along the length of the first mounting rod. One end of each rotating block is rotatably connected to the first mounting rod, and the other end extends toward an adjacent arc-shaped plate. The rotating block has a pair of protrusions at one end away from the first mounting rod, with a gap between the pair of protrusions. A second mounting rod is also provided between two adjacent arc-shaped plates, and the protrusions of the rotating block and the second mounting rod are rotatably connected between the two adjacent arc-shaped plates. The two protrusions of the rotating block have the same width, and the width of each protrusion is 1 / 4 of the width of the entire rotating block. Each protrusion has a gap on both sides of its rotating block, which is 1 / 8 of the width of the entire rotating block. The distance between the two protrusions is 1 / 4 of the width of the entire rotating block. When two adjacent rotating blocks are connected to the second mounting rod, they are kept tightly engaged when the relative angle of the two rotating blocks is adjusted, which reduces the amount of bauxite between the arc plate and the treatment tank entering the side where the mounting column is located. Multiple warm air pipes are installed near the first vertical plate at one end of the processing tank. These pipes are positioned close to the mounting column, with a gap between them and the first vertical plate. One end of each pipe extends through the end of the processing tank into the space between the mounting column and the arc-shaped plate inside the tank. The other end of the pipe is connected to a waste heat recovery pipe to recover and transport waste heat generated during production within the plant to the processing tank. Warm air entering the space between the arc-shaped plate and the mounting column flows through the gap between the rotating blocks of adjacent arc-shaped plates to the gap between the first and second crushing teeth, further warming the bauxite during fine crushing. The process provides warm air, which is distributed radially from the mounting column to the inner wall of the processing tank. This warm air dries the moisture that appears during the fine crushing of bauxite. The warm air that enters between the first and second crushing teeth is finally discharged from the tank through the feed cylinder at the top and the screening hole at the bottom. The warm air that diffuses radially from the mounting column to the inner wall of the processing tank blows away small particles during the fine crushing process of the first and second crushing teeth, preventing them from clogging the gap between the rotating block and the arc plate, thus avoiding affecting the adjustment of the arc plate and the rotating block, and preventing them from entering the space between the mounting column and the arc plate.

2. The bauxite pretreatment apparatus according to claim 1, characterized in that: The crushing mechanism is a jaw crusher. A first mounting plate is provided on the frame, and a mounting opening is provided on the first mounting plate. The jaw crusher is installed in the mounting opening. A collection cylinder is also provided below the installation port. One end of the collection cylinder is connected to the installation port, and the other end of the collection cylinder extends to the top of the processing tank. An electric slide valve is provided on the collection cylinder, and the electric slide valve is connected to the control device.

3. The bauxite pretreatment apparatus according to claim 2, characterized in that: The processing tank is a horizontal tank, with gaps between the two ends of the processing tank and the two ends of the frame, and gaps between the front and rear sides of the processing tank and the frame, which are movably connected; a feed cylinder is provided at the top of the processing tank near the collection cylinder, and the feed cylinder is located at the bottom of the collection cylinder; multiple screening holes are evenly provided on the bottom sidewall of the processing tank. The bottom of the frame is also equipped with a receiving bin.

4. The bauxite pretreatment apparatus according to claim 1, characterized in that: The connecting rod of the second upright plate is provided with a first pulley away from the mounting column, and a third mounting plate is provided at one end near the second upright plate. A first motor is provided on the third mounting plate, and the output shaft of the first motor is connected to a second pulley. A belt ring is sleeved between the second pulley and the first pulley. The first motor is connected to the control device.

5. The bauxite pretreatment apparatus according to claim 1, characterized in that: The support mechanism includes a sliding sleeve and a sliding bar. One end of the sliding sleeve is connected to the outer wall of the mounting column, and the other end of the sliding sleeve extends towards the arc-shaped plate along the radial direction of the mounting column. The sliding bar is disposed inside the sliding sleeve and slidably connected to the sliding sleeve. One end of the sliding bar is connected to the arc-shaped plate, and the other end is provided with a sliding groove. A sliding rod is provided at the end of the sliding sleeve away from the sliding bar, and a spring is provided on the sliding rod. One end of the spring abuts against the end of the sliding groove away from the sliding bar, and the other end abuts against the sliding bar.

6. The bauxite pretreatment apparatus according to claim 5, characterized in that: The adjustment mechanism is provided in two parts, which are relatively close to the two ends of the support mechanism of the processing tank; The adjustment mechanism includes a mounting ring and a transmission ring. The mounting ring is disposed on the mounting post near the sliding sleeve, and the mounting ring and the mounting post are rotatably connected. An arc-shaped strip is disposed on the outer side of the mounting ring with the mounting post as the center, corresponding to the adjacent sliding strip. One end of the arc-shaped strip is connected to the outer side of the mounting ring, and the other end extends outward in a spiral shape. An arc-shaped sliding hole is disposed on the arc-shaped strip, and a limit rod is disposed on the sliding strip corresponding to each arc-shaped strip. One end of the limit rod is connected to the sliding strip, and the other end extends into the corresponding arc-shaped sliding hole and is slidably connected to the arc-shaped sliding hole. The transmission ring is provided at one end of the mounting ring near the sliding sleeve. The transmission ring and the mounting post are spaced apart, and multiple teeth are evenly arranged on the outer side of the transmission ring. A pair of fixing plates are provided on the outer wall of the mounting column along the axial direction of the mounting column. A rotating shaft is provided between the pair of fixing plates. The rotating shaft and the pair of fixing plates are rotatably connected. Both ends of the rotating shaft extend through the fixing plates to the two adjustment mechanisms. A first gear is provided at both ends of the rotating shaft. The first gear meshes with the teeth of the corresponding transmission ring. A first bevel gear is also provided on the rotating shaft, and a second motor is provided on the mounting post near the first bevel gear. The output shaft of the second motor is connected to the second bevel gear, the second bevel gear extends toward the first bevel gear and meshes with the first bevel gear, and the second motor is connected to the control device.

7. A method for pretreating bauxite, characterized in that: The bauxite pretreatment apparatus according to any one of claims 1-6 includes the following steps: S1: Larger pieces of bauxite are transported to the crushing mechanism, which first crushes the bauxite into smaller pieces before transporting them to the processing tank. S2: The control device controls the fine crushing mechanism to further crush and finely grind small pieces of bauxite, and dynamically adjusts the fine crushing mechanism to meet the fine crushing requirements; S3: The processing tank is assisted by an intermittent start-stop screening mechanism to screen out bauxite that meets the particle size requirements. Bauxite that does not meet the particle size requirements is further crushed in the processing tank. The particle size of the crushing mechanism is readjusted so that it gradually meets the particle size requirements.

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