Limestone high-calcium stone screening production line

Abstract

The invention discloses a limestone high-calcium stone screening production line which comprises screening rollers, a vibrating screen, a swinging screen and a crushing mechanism, the multiple screening rollers are arranged side by side, a first conveying belt is arranged below the multiple screening rollers, a cleaning and drying cylinder is arranged below the tail end of the first conveying belt, limestone is cleaned and dried through the cleaning and drying cylinder, and the crushing mechanism is arranged below the first conveying belt. The cleaning and drying cylinder is in butt joint with the vibrating screen, screening is conducted through the vibrating screen, limestone smaller than 5 mm is conveyed to the crushing mechanism to be crushed, and materials processed by the crushing mechanism are conveyed to the oscillating screen to be screened; limestone is sorted after being cleaned, so that impurities of the limestone are cleaned, and the screened limestone raw material conforms to the food specification.

Description

Technical Field

[0001] This invention relates to the field of high-calcium stone processing equipment, specifically to a limestone high-calcium stone screening production line. Background Technology

[0002] Currently, the screening of high-calcium limestone mainly employs a combination of screening rollers and vibrating screens for vibratory sorting. Limestone raw materials mined from mines are initially sorted and graded by particle size using screening rollers, with smaller particles then entering the vibrating screen for further grading. However, this screening system has a significant drawback: the sorted small limestone particles are still too large to be directly used as feed-grade limestone powder.

[0003] Although small-particle limestone can theoretically be used as a feed ingredient, feed-grade limestone powder has strict requirements on particle size. Current processes produce small-particle limestone that does not meet these standards and requires secondary processing and re-screening to obtain compliant limestone raw materials. Because existing screening technologies cannot directly produce qualified raw materials, this portion of small-particle limestone is often treated as waste in actual production, resulting in resource waste.

[0004] Since limestone is currently used as a raw material for cement instead of being used as feed-grade stone powder after screening, it is not washed during screening and therefore cannot be used as a food additive. Therefore, it needs to be washed during screening. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, this invention proposes a limestone high-calcium stone screening production line, which facilitates secondary processing and screening of small limestone particles. The final screening yields high-calcium stone powder, with particles ranging from 3.5mm to 0.85mm and smaller than 0.425mm, as the main varieties for use as feed raw material stone powder. This transforms the small limestone particles that would otherwise be waste into economic products.

[0006] To achieve the above objectives, the present invention provides a limestone high-calcium stone screening production line, comprising screening rollers, a vibrating screen, a swing screen, and a crushing mechanism. Multiple screening rollers are arranged side by side, and a first conveyor belt is arranged below the multiple screening rollers. A washing and drying cylinder is arranged below the end of the first conveyor belt. The limestone is washed and dried by the washing and drying cylinder. The washing and drying cylinder is connected to the vibrating screen for screening. Limestone smaller than 5mm is conveyed to the crushing mechanism for crushing, and the material processed by the crushing mechanism is conveyed to the swing screen for screening. The cleaning and drying drum includes an inner drum and an outer drum, which are nested together. The inner drum rotates inside the outer drum. The outer wall of the inner drum has multiple water passage holes with a diameter smaller than that of limestone. Spiral conveying blades are installed on the inner wall of the inner tube. A hollow tube passes through the center of the inner drum. A baffle that fits inside the hollow tube is inserted inside the hollow tube. An operating rod that can push is installed on the baffle. One end of the operating rod passes through the hollow tube. The two ends of the hollow tube are respectively connected to a water supply component and a hot air supply component. Multiple through holes communicating with the inside of the hollow tube are provided on the outer wall of the hollow tube.

[0007] Preferably, an immersion zone is provided at the front end of the inner cylinder, the immersion zone includes an annular baffle and a baffle plate, an annular baffle is provided on the inner wall of the outer cylinder, the inner wall of the annular baffle is combined with the outer wall of the inner cylinder, a baffle plate is provided on the inner wall of the inner cylinder, the baffle plate and the annular baffle are located on the same plane, the top of the baffle plate is fixed to the hollow tube, the bottom of the baffle plate is attached to and slidably fitted with the inner wall of the inner cylinder, and the spiral conveying blades are porous blades.

[0008] Preferably, the vibrating screen includes a mounting frame, an upper screen, and a lower screen. A base is provided below the mounting frame, and multiple springs are provided between the base and the bottom of the mounting frame. A vibrating motor is installed on the outer wall of the mounting frame. Multiple lower screens with equal height differences are provided inside the mounting frame, and the aperture of the multiple lower screens gradually decreases from top to bottom. An upper screen is installed on the mounting frame above the lower screens. The upper screen is divided into multiple layers, and the aperture of each upper screen gradually increases from right to left. Each upper screen rotates in conjunction with the mounting frame, and a swing component is provided between each upper screen and the mounting frame. A linkage component is provided between multiple swing components to achieve synchronous rotation of multiple upper screens. A connecting component is provided between two adjacent upper screens.

[0009] Preferably, an arc-shaped hole is opened on the outer wall of the mounting frame, and the swing component is a sliding column. The sliding column is set in the arc-shaped hole, one end of the sliding column is fixed to the outer wall of the upper screen, and the sliding column extends out of the mounting frame. The linkage component includes a hydraulic cylinder, a linkage rod, and a linkage cylinder. The linkage rod has threaded sections at both ends. Two seats are installed on the mounting frame. The threaded sections of the linkage rod pass through the seats, and the threaded sections of the linkage rod of the two seats are threadedly engaged. A stepper motor is installed at one end of the linkage rod. A ring is fitted on the sliding column. Multiple annular grooves are opened on the linkage rod, and a ring is installed in each annular groove. A connecting rod is fixed on the ring of the sliding column. The other end of the connecting rod is hinged to the ring of the linkage rod. The movement of the linkage rod drives the sliding column to slide in the arc-shaped hole.

[0010] Preferably, the connecting component is a connecting piece, one end of which is hinged to one end of an upper screen, and the other end of which is slidably engaged with the bottom of an adjacent upper screen. When multiple upper screens swing downwards, the multiple upper screens form a stepped shape.

[0011] Preferably, multiple receiving hoppers are provided below the vibrating screen, and each receiving hopper is connected to the tail end of the corresponding upper and lower screens, so that the limestone in the upper and lower screens enters the corresponding receiving hopper, thus achieving screening; a second conveyor belt is provided below each receiving hopper, which transports limestone of different particle sizes out, and a crushing mechanism is provided below the end of the conveyor belt that transports the finest limestone particles.

[0012] Preferably, the crushing mechanism is a curved roller mill, with an elevator installed below it. A gyratory screen is installed below the elevator's discharge port, containing two layers of screens. A hopper for receiving material is located below the end of each screen layer. The other end of the return assembly is positioned directly above the crushing mechanism. A trough plate is located below the gyratory screen, with a powder hopper connected to its end. A movable scraper is installed within the trough, allowing the powder to move within the trough plate. A gyratory elastic ball is located below each screen layer of the gyratory screen, with each elastic ball fixed... It has a swing rod, the other end of which is hinged to the inner wall of the swing screen. A pressure plate for the elastic ball to strike is installed at the bottom of the screen. A tie rod is hinged in the middle of the swing rod. The tie rods on the same side are hinged to the same translation rod. The translation rod moves in conjunction with the inner wall of the swing screen. Multiple guide rods are installed on the outside of the translation rod. The guide rods pass through the outer wall of the swing screen and protrude from the swing screen. A pulley is installed at the end of the guide rod. An inclined plane is installed on the fixed frame of the swing screen. The pulley moves along the inclined plane on the swing screen. The elastic ball strikes the bottom of the screen, thus achieving high conveying efficiency.

[0013] Compared with the prior art, the advantages of the present invention are as follows: After the limestone is washed, it is sorted to remove impurities and ensure that the screened limestone raw materials meet food specifications. Meanwhile, the screen at the top of the vibrating screen is set in a stepped shape, which facilitates the screening effect of limestone. At the same time, the inclination of the upper screen can be adjusted at any time according to the amount of limestone to be screened. The screen of the oscillating screen is struck, which improves the flowability of small limestone particles and thus increases screening efficiency. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention.

[0015] Figure 2 This is a top view of the present invention.

[0016] Figure 3 This is a perspective view of the screening roller and the washing and drying cylinder of the present invention.

[0017] Figure 4 This is a cross-sectional view of the cleaning and drying cylinder of the present invention.

[0018] Figure 5 This is a schematic diagram of the vibrating screen of the present invention.

[0019] Figure 6 This is a cross-sectional view of the vibrating screen of the present invention.

[0020] Figure 7 This is a schematic diagram of the crushing mechanism of the present invention.

[0021] Figure 8 This is a top view of the oscillating screen of the present invention.

[0022] Figure 9 This is a cross-sectional view of the oscillating screen of the present invention.

[0023] The components are as follows: 1. Screening roller; 2. First conveyor belt; 3. Vibrating screen; 4. Mounting frame; 5. Vibrating motor; 6. Arc-shaped hole; 7. Upper screen; 8. Swing assembly; 9. Sliding column; 10. Linkage assembly; 11. Hydraulic cylinder; 12. Linkage rod; 13. Linkage cylinder; 14. Threaded section; 15. Seat; 16. Ring; 17. Annular groove; 18. Connecting rod; 19. Connecting assembly; 20. Connecting plate; 21. Lower screen; 22. Base; 23. Receiving hopper; 24. Second conveyor belt; 25. Swinging screen; 26. Screen mesh. 27. Storage hopper; 28. Powder hopper; 29. ​​Scraper; 30. Swinging elastic ball; 31. Swinging rod; 32. Pressure plate; 33. Tie rod; 34. Moving rod; 35. Guide rod; 36. Inclined surface; 38. Crushing mechanism; 39. Elevator; 41. Washing and drying cylinder; 42. Inner cylinder; 43. Water passage hole; 44. Screw conveyor blade; 45. Hollow tube; 46. Baffle; 47. Operating lever; 48. Water supply assembly; 49. Hot air supply assembly; 50. Soaking zone; 51. Annular baffle; 52. Water baffle; 53. Outer cylinder. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] like Figure 1-9As shown, a limestone high-calcium stone screening production line includes screening rollers 1, vibrating screens 3, oscillating screens 25, and a crushing mechanism 38. Multiple screening rollers 1 are arranged side-by-side. Conveyor belts for conveying limestone are positioned above the front end and below the rear end of each screening roller 1. These conveyor belts are mounted on the ground via support legs. The limestone is crushed by the screening rollers 1, separating limestone smaller than 30mm. A first conveyor belt 2 is positioned below the multiple screening rollers 1, mounted on the ground via support legs. The first conveyor belt 2 is angled upwards from right to left. A washing and drying cylinder 41 is positioned to the lower left of the first conveyor belt 2. The separated limestone is washed and dried in the washing and drying cylinder 41. Clean limestone is obtained. The other end of the washing and drying cylinder 41 is connected to the vibrating screen 3. The limestone in the washing and drying cylinder 41 is poured into the vibrating screen 3 and screened. Limestone smaller than 5mm is sent to the crushing mechanism 38 for crushing, and limestone larger than 5mm is sent back to the cement calciner for calcination. Limestone smaller than 5mm is processed by the crushing mechanism 38 and then sent to the swing screen 25 for screening. The swing screen 25 will finally screen out limestone with the main varieties of 3.5mm-0.85mm and below 0.425mm. Limestone between 0.425mm and 0.85mm is sent to the crushing mechanism 3 for secondary crushing by manual means. The washing and drying drum 41 includes an inner drum 42 and an outer drum 53. Fixed seats are bolted to the ground at both ends of the outer drum 53. Grooves are formed in the fixed seats to embed the outer drum 53. The outer drum 53 is fixed to the fixed seats by bolts. A hopper is installed on the top of the fixed seat at the front of the outer drum 53. A hole communicating with the groove is formed in the fixed seat, and the bottom of the hopper communicates with the hole. A discharge notch is formed at the bottom of the fixed seat at the rear of the outer drum 53. Limestone from the inner drum is discharged into the groove of the fixed seat, and limestone in the groove is discharged through the notch. The inner drum 42 and the outer drum 53 are connected... The inner cylinder 42 and the outer cylinder 53 are nested together, with a sandwich structure between them. The inner cylinder 42 rotates within the outer cylinder 53. A bearing is installed between the outer cylinder 53 and the inner cylinder 42 to enable the rotation of the inner cylinder 42 within the outer cylinder 53. Multiple water passage holes 43, smaller in diameter than the limestone, are opened on the outer wall of the inner cylinder 42. Spiral conveying blades 44 are fixed to the inner wall of the inner cylinder 42 by welding. When the inner cylinder 42 rotates, the limestone is conveyed within it. A hollow tube 45 passes through the center of the inner cylinder 42, passing through two fixed seats. The device is fixed to a mounting base by welding. A baffle 46, which fits snugly inside the hollow tube 45, is inserted inside the hollow tube 45. An operating rod 47, capable of pushing, is welded onto the baffle 46. The operating rod 47 moves the baffle 46 within the hollow tube 45. The rear end of the operating rod 47 passes through the hollow tube 45. An electric cylinder is bolted to the outer wall of the rear end of the hollow tube 45. The telescopic rod of the electric cylinder is connected to the operating rod by welding. The forward and backward movement of the operating rod is achieved by the extension and retraction of the electric cylinder, thus adjusting the position of the baffle 46. The two ends of the inner tube 45 are respectively connected to a water supply component 48 and a hot air supply component 49. The water supply component is the pump body, and the hot air supply component 49 is the hot air blower. Water and hot air are respectively stored in the hollow tubes at the front and rear ends of the baffle 45. Multiple through holes communicating with the inside of the hollow tube 45 are opened on the outer wall of the hollow tube 45. Hot air and water are discharged through the through holes on the outer wall of the hollow tube 45. In this way, the water washes the limestone in the inner cylinder 42, and the hot air dries the moisture on the limestone, thus achieving cleaning and drying. A large opening is opened at the rear end of the outer cylinder 53. A motor is fixed to the outer wall by bolts, and a gear is fixed to the output shaft of the motor. A gear ring that meshes with the gear is fixed to the outer wall of the inner cylinder 42 by welding. The motor drives the inner cylinder 42 to rotate, so that the limestone inside the inner cylinder 42 moves from front to back. The limestone is first washed with clean water, and then dried by hot air and centrifugation. The length of the limestone washing can be adjusted by moving the baffle 46. When there is a lot of dirt on the limestone, the baffle 46 moves backward to extend the washing area, and the hot air volume needs to be increased to ensure the limestone is dry. When the limestone is relatively clean and does not need to be washed for a long time, the baffle 46 can be moved forward to shorten the washing area and reduce the hot air volume.

[0026] A soaking zone 50 is provided at the front end of the inner cylinder 42. The soaking zone 50 includes an annular baffle 51 and a baffle 52. The annular baffle 51 is fixed to the inner wall of the outer cylinder 53 by welding. The inner wall of the annular baffle 51 is connected to the outer wall of the inner cylinder 42 (the soaking zone 50 is continuously replenished with liquid, allowing for a small amount of leakage, so the outer wall of the inner cylinder 42 and the annular baffle 51 do not need to be sealed). A baffle 52 is provided on the inner wall of the inner cylinder 42. The baffle 52 and the annular baffle 51 are located on the same plane. The top is fixed to the hollow tube 45 by welding. The baffle plate 52 does not rotate. The bottom of the baffle plate 52 is in close contact with the inner wall of the inner cylinder 42 and slides. Since there are water passage holes on the outer wall of the inner cylinder 42, the baffle plate 52 and the inner cylinder 42 do not need to be sealed. A small amount of liquid passes through the bottom of the baffle plate 52 and can be drained through the water passage holes. The spiral conveying blade 44 is a porous blade, so when the limestone is conveyed (when the spiral conveying blade 44 lifts the limestone to the water surface), the water on the limestone is drained away.

[0027] The vibrating screen 3 includes a mounting frame 4, an upper screen 7, and a lower screen 21. A base 22 is located below the mounting frame 4 and is bolted to the ground. Multiple springs are bolted between the base 22 and the bottom of the mounting frame 4, causing the mounting frame 4 to vibrate. A vibrating motor 5 is bolted to the outer wall of the mounting frame 4, and the vibration of the mounting frame 4 is achieved by an eccentric block on the vibrating motor 5. Two layers of lower screens 21 with equal height are installed inside the mounting frame. The edges of the lower screens 21 are welded to the inner wall of the mounting frame 4. The aperture of the multiple lower screens 21 gradually decreases from top to bottom, resulting in different limestone particle sizes on each lower screen 21. The upper screen 7 is installed on the mounting frame 4 above the lower screens 21. The upper screen 7 is divided into three sections, with the aperture of each upper screen 7 gradually increasing from right to left. Each upper screen 7 rotates with the mounting frame 4. The upper screen 7 is fixed to the right end of each layer by welding, and the shaft is installed inside the mounting frame 4 by bearings, thus realizing the rotation of the upper screen 7. A swing component 8 is set between each upper screen 7 and the mounting frame 4, and a linkage component 10 is set between multiple swing components 8. The linkage component 10 realizes the synchronous rotation of multiple upper screens 7. A connecting component 19 is set between two adjacent upper screens 7 to prevent limestone leakage from the gaps between the upper screens 7. In this way, the three upper screens 7 form a stepped shape. The stepped upper screens 7 form a height difference. When the limestone falls at the steps, it can break the stratification of limestone by size, which effectively improves the screening effect (when screening, when small limestone particles are above large limestone particles, screening is impossible. When passing through the steps, the limestone breaks the stratification when falling, thus improving the screening effect). At the same time, the limestone falls easily through the screen.

[0028] An arc-shaped hole 6 is opened on the outer wall of the mounting frame 4. The swing component 8 is the sliding column 9. The sliding column 9 is inserted into the arc-shaped hole 6, and a rubber corrugated sheet is also inserted into the arc-shaped hole 6. When the sliding column 9 moves along the arc-shaped hole 6, the corrugated sheet closes the arc-shaped hole 6, and the sliding column 9 slides within the arc-shaped hole 6. One end of the sliding column 9 is fixed to the outer wall of the left end of the upper screen 7 by welding. The upper screen 7 swings through the sliding column 9, and the sliding column 9 extends out of the mounting frame 4. The linkage component 10 includes a hydraulic cylinder 11, a linkage rod 12, and a linkage cylinder 13. Threaded sections 14 are fixed to both ends of the linkage rod 12 by welding. Two seats 15 are installed on the mounting frame 4 by bolts. The threaded sections 14 of the linkage rod 12 pass through the seats 15, and the threaded sections 14 and seats 15 are threadedly engaged. The two seats 15 are linked to the threaded sections 14 of the linkage rod 12. A stepper motor is installed at one end of the linkage rod 12 by welding, with the output shaft of the stepper motor welded to the linkage rod 12. The stepper motor housing is slidably fitted to the outer wall of the mounting frame 4 (a slide rail is installed on the outer wall of the mounting frame by welding, and a slide block is clamped on the slide rail; the stepper motor housing is fixed to the slide block by bolts; the slide rail is parallel to the linkage rod 12, so the stepper motor moves along the slide rail). A ring 16 is fitted on the sliding column 9, and multiple annular grooves 17 are opened on the linkage rod 12, with a ring 16 also installed in each annular groove 17. A connecting rod 18 is fixed to the ring 16 of the sliding column 9 by welding, and the other end of the connecting rod 18 is hinged to the ring 16 of the linkage rod 12. The movement of the linkage rod 12 drives the sliding column 9 to slide in the arc-shaped hole 6, and the rotation of the linkage rod 12 realizes the swing of the upper screen 7.

[0029] The connecting component 19 is the connecting piece 20. The left end of the connecting piece 20 is hinged to the right end of the upper screen 7 on the left side, and the right end of the connecting piece 20 is slidably engaged with the bottom of the upper screen 7 on the right side. A sliding rail is fixed to the bottom of each upper screen 7 near the left end by welding. A sliding seat that moves on the sliding rail is clamped on the sliding rail. The right end of the connecting piece 20 is hinged to the sliding seat. When multiple upper screens 7 swing downward, the multiple upper screens 7 form a stepped shape.

[0030] Multiple horizontally arranged receiving hoppers 23 are fixed below the vibrating screen 3 by welding. Each receiving hopper 23 is connected to the tail of the corresponding upper screen 7 and lower screen 21. A sealing plate is welded to the bottom of the mounting frame. There are four receiving hoppers 23. The first receiving hopper 23 on the right is connected to the sealing plate, the second receiving hopper 23 on the right is connected to the bottom lower screen, the third receiving hopper 23 on the right is connected to the middle lower screen, and the fourth receiving hopper 23 on the right is connected to the upper screen. In this way, the limestone in the upper screen 7 and the lower screen 21 enters the corresponding receiving hopper 23, thus achieving screening. A second conveyor belt 24 is set on the bottom surface below each receiving hopper 23. The limestone in each receiving hopper 23 falls onto a different second conveyor belt. The second conveyor belt 24 transports limestone of different particle sizes. The finest limestone particles (limestone less than 5mm in the first receiving hopper on the right) are transported. A crushing mechanism 38 is set below the end of the conveyor belt and is installed on the ground.

[0031] The crushing mechanism 38 is a curved roller mill (existing equipment). The limestone on the second conveyor belt falls into the curved roller mill for crushing, thus reducing the particle size of the limestone. An elevator 39 is installed below the curved roller mill (the curved roller mill has buckets installed by bolts). The elevator 39 is a screw elevator, and its end connects to the buckets below the curved roller mill, lifting the limestone from the buckets. A oscillating screen 25 is installed below the discharge port of the elevator 39, allowing the crushed limestone to pass through the oscillating screen. The oscillating screen 25 has two layers fixed by welding. Screen 26, with a storage hopper 27 for receiving material fixed by bolts on the bottom surface below the end of each screen 26. The two storage hoppers respectively receive limestone from the two screens 26. The storage hopper connected to the upper screen has limestone with a diameter of 0.85mm-3.5mm, and the storage hopper connected to the lower screen has limestone with a diameter of 0.425mm-0.85mm. The limestone is manually transported to the crushing mechanism for secondary crushing. The storage hopper 27 connected to the bottom screen 26 has a trough-shaped plate fixed by bolts on the bottom surface below the oscillating screen 25. The oscillating screen 25 screens out 0.Powder particles smaller than 425mm (used as feed powder) are received. A powder hopper 28 is fixed to the end of the trough plate by welding. The powder hopper 28 receives the powder from the trough plate. A movable scraper 29 is installed inside the trough plate to move the powder within the trough plate, so that the powder in the trough plate enters the powder hopper 28. Multiple oscillating elastic balls 30 are installed below each layer of screen 26 of the oscillating screen 25. An oscillating rod 31 is fixed to each oscillating elastic ball by welding. The other side of the oscillating rod 31... The end is hinged to the inner wall of the oscillating screen 25, thus realizing the oscillation of the oscillating elastic ball. A pressure plate 32 for the elastic ball to strike is installed at the bottom of the screen 26 by welding. The oscillating elastic ball strikes the pressure plate 32 directly. A pull rod 33 is hinged to the middle section of the oscillating rod 31. The pull rods 33 on the same side are hinged to the same translation rod. The translation rod is in translational cooperation with the inner wall of the oscillating screen 25. Multiple guide rods 35 are installed on the outside of the translation rod by welding. The guide rods 35 pass through the outer wall of the oscillating screen 25 and protrude from the oscillating rod. The oscillating screen 25 moves left and right via a translation rod and guide rod 35. A pulley is mounted on the end of guide rod 35 furthest from the translation rod via a bearing. Rollers are mounted on the bottom of the oscillating screen via bearings. Fixed frames are bolted to the ground on both sides of the trough plate. The rollers reciprocate on the fixed frames. A motor is bolted to the right end of the fixed base. A crank of a crank-rocker mechanism is welded to the motor's output shaft. The rocker arm of the crank-rocker mechanism is hinged to the left end of the oscillating screen. An inclined plane 36 is welded onto the fixed frame of the oscillating screen 25. A pulley moves along the inclined plane 36 on the oscillating screen 25. An elastic ball strikes the bottom of the screen mesh 26. When the screen mesh is struck, the limestone jumps upwards. Due to inertia, the limestone remains suspended in the air, causing the screen mesh to descend and separate from the limestone. The oscillating screen moves forward, and the limestone falls onto the screen mesh. The limestone then moves to the right with the screen mesh. Thus, when the screen mesh moves to the left, the limestone does not contact the screen mesh, preventing it from moving to the left with the screen mesh, resulting in high conveying efficiency.

Claims

1. A limestone high-calcium stone screening production line, comprising screening rollers, a vibrating screen, a swing screen, and a crushing mechanism, wherein multiple screening rollers are arranged side by side, and a first conveyor belt is arranged below the multiple screening rollers, characterized in that, A washing and drying cylinder is installed below the end of the first conveyor belt. The limestone is washed and dried through the washing and drying cylinder. The washing and drying cylinder is connected to a vibrating screen for screening. Limestone smaller than 5mm is conveyed to a crushing mechanism for crushing. The material processed by the crushing mechanism is conveyed to a swing screen for screening. The cleaning and drying drum includes an inner drum and an outer drum, which are nested together. The inner drum rotates inside the outer drum. The outer wall of the inner drum has multiple water passage holes with a diameter smaller than that of limestone. Spiral conveying blades are installed on the inner wall of the inner tube. A hollow tube passes through the center of the inner drum. A baffle that fits inside the hollow tube is inserted inside the hollow tube. An operating rod that can push is installed on the baffle. One end of the operating rod passes through the hollow tube. The two ends of the hollow tube are respectively connected to a water supply component and a hot air supply component. Multiple through holes communicating with the inside of the hollow tube are provided on the outer wall of the hollow tube.

2. The limestone high-calcium stone screening production line according to claim 1, characterized in that, An immersion zone is provided at the front end of the inner cylinder, which includes an annular baffle and a baffle plate. An annular baffle is provided on the inner wall of the outer cylinder, and the inner wall of the annular baffle is connected to the outer wall of the inner cylinder. A baffle plate is provided on the inner wall of the inner cylinder, and the baffle plate and the annular baffle are located on the same plane. The top of the baffle plate is fixed to the hollow tube, and the bottom of the baffle plate is attached to and slides against the inner wall of the inner cylinder. The spiral conveyor blades are porous blades.

3. The limestone high-calcium stone screening production line according to claim 2, characterized in that, The vibrating screen includes a mounting frame, an upper screen, and a lower screen. A base is installed below the mounting frame, and multiple springs are installed between the base and the bottom of the mounting frame. A vibrating motor is installed on the outer wall of the mounting frame. Multiple lower screens with equal height differences are installed inside the mounting frame, and the aperture of the multiple lower screens gradually decreases from top to bottom. The upper screen is installed on the mounting frame above the lower screens. The upper screen is divided into multiple layers, and the aperture of each upper screen gradually increases from right to left. Each upper screen rotates in conjunction with the mounting frame, and a swing component is installed between each upper screen and the mounting frame. A linkage component is installed between multiple swing components to achieve synchronous rotation of multiple upper screens. A connecting component is installed between adjacent upper screens.

4. The limestone high-calcium stone screening production line according to claim 3, characterized in that, An arc-shaped hole is opened on the outer wall of the mounting frame. The swing component is the sliding column, which is set in the arc-shaped hole. One end of the sliding column is fixed to the outer wall of the upper screen, and the sliding column extends out of the mounting frame. The linkage component includes a hydraulic cylinder, a linkage rod, and a linkage cylinder. The linkage rod has threaded sections at both ends. Two seats are installed on the mounting frame. The threaded sections of the linkage rod pass through the seats, and the threaded sections of the linkage rod of the two seats are threaded together. A stepper motor is installed at one end of the linkage rod. A ring is fitted on the sliding column. Multiple annular grooves are opened on the linkage rod, and a ring is installed in each annular groove. A connecting rod is fixed on the ring of the sliding column. The other end of the connecting rod is hinged to the ring of the linkage rod. The movement of the linkage rod drives the sliding column to slide in the arc-shaped hole.

5. The limestone high-calcium stone screening production line according to claim 4, characterized in that, The connecting component is the connecting piece. One end of the connecting piece is hinged to one end of an upper screen, and the other end of the connecting piece slides into the bottom of the adjacent upper screen. When multiple upper screens swing downwards, they form a stepped structure.

6. The limestone high-calcium stone screening production line according to claim 5, characterized in that, Multiple receiving hoppers are installed below the vibrating screen. Each receiving hopper is connected to the tail end of the corresponding upper and lower screens, so that the limestone in the upper and lower screens enters the corresponding receiving hopper, thus achieving screening. A second conveyor belt is installed below each receiving hopper to transport limestone of different particle sizes. A crushing mechanism is installed below the end of the conveyor belt that transports the finest limestone particles.

7. A limestone high-calcium stone screening production line according to claim 6, characterized in that, The crushing mechanism is a curved roller mill. An elevator is installed below the curved roller mill, and a gyratory screen is installed below the elevator's discharge port. The gyratory screen has two layers of screens, with a hopper for receiving material located below the end of each screen layer. The other end of the return assembly is located directly above the crushing mechanism. A trough plate is installed below the gyratory screen, with a powder hopper connected to its end. Moving scrapers are installed inside the trough, allowing the powder to move within the trough plate. A gyratory elastic ball is installed below each screen layer of the gyratory screen, and a swing arm is fixed to each elastic ball. The other end of the swing rod is hinged to the inner wall of the swing screen. A pressure plate for the elastic ball to strike is installed at the bottom of the screen. A tie rod is hinged in the middle of the swing rod. The tie rods on the same side are hinged to the same translation rod. The translation rod moves in conjunction with the inner wall of the swing screen. Multiple guide rods are installed on the outside of the translation rod. The guide rods pass through the outer wall of the swing screen and protrude from the swing screen. A pulley is installed at the end of the guide rod. An inclined plane is installed on the fixed frame of the swing screen. The pulley moves along the inclined plane on the swing screen. The elastic ball strikes the bottom of the screen, thus achieving high conveying efficiency.

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