A multi-stage screening device and method based on coal gangue organic fertilizer production and processing

Abstract

The application discloses a kind of multistage screening equipment and method based on coal gangue organic fertilizer production and processing, it is related to coal gangue organic fertilizer production and processing technical field;Multistage screening equipment includes multistage screening mechanism, first screening processing mechanism, secondary screening processing mechanism, back material mechanism;The application is smashed by first screening processing mechanism to the screen on material of first screening plate;By secondary screening processing mechanism, the screen on material of secondary screening plate is ground;By back material mechanism, coal gangue after grinding and after being smashed is sent back to screening box and is screened;Light and heavy mineral screening mechanism carries out light and heavy mineral separation to the coal gangue screened by multistage;The application is realized by the cooperation of multilayer screen plate and screening bed, and the continuous multistage screening and light and heavy mineral separation of coal gangue, effectively avoid the harm of pyrite to soil, and seamlessly link screening and crushing, grinding treatment, form automatic back material closed loop, greatly improve the production efficiency of coal gangue organic fertilizer.

Description

Technical Field

[0001] This invention relates to the field of coal gangue organic fertilizer production and processing technology, specifically to a multi-stage screening equipment and method based on coal gangue organic fertilizer production and processing. Background Technology

[0002] The production process of coal gangue organic fertilizer involves using coal gangue as a basic raw material or amendment, combining it with organic materials and microbial agents to produce fertilizers or artificial substrates that improve soil and promote plant growth. Chinese patent application number 202511396254.4 discloses a grading and screening device for hydrogen production residue in the production of coal gangue ecological organic fertilizer. The device includes a protective frame with a screening mechanism inside. The screening mechanism includes a screening box with multiple screening components inside. Each screening component consists of multiple screening rods, with the number of screening rods increasing from top to bottom in each layer. The upper screening rods are connected to the corresponding lower screening rods via connecting plates, and sliding rods are fixed to both ends of each screening rod. These sliding rods are slidably mounted on slides opened on the screening box. This invention, by setting up a screening box, screening rods, sliding rods, and an adjusting plate, allows the spacing between multiple screening rods to be adjusted via the adjusting plate and the sliding rods, thereby adjusting the channel size between the multiple screening rods. By cooperating with the screening box, the screening rods can perform screening operations of different specifications.

[0003] This technical solution only achieves multi-stage screening by adjusting the size of the channels between the screening rods. However, in the production of coal gangue organic fertilizer, this solution is not conducive to continuous feeding, resulting in a low hourly processing capacity. In addition, coal gangue is a solid waste discharged during coal mining and washing, containing a large number of associated minerals. When pyrite enters the soil, it oxidizes to produce sulfuric acid, which can easily cause severe soil acidification. At the same time, it releases a large amount of iron ions and sulfides, which poison crop roots. Therefore, it is necessary to screen the light minerals used to produce organic fertilizer with heavy minerals such as pyrite. In the process of coal gangue screening, the existing equipment requires further processing of coal gangue of different sizes according to the screening results after screening, followed by screening again. The connection between screening and refining is usually done manually, resulting in low production efficiency of existing coal gangue organic fertilizer. Therefore, a multi-stage screening equipment for coal gangue organic fertilizer production and processing is needed that can not only perform multi-stage screening and screening of light and heavy minerals, but also directly process the results of multi-stage screening. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a multi-stage screening equipment and method based on the production and processing of coal gangue organic fertilizer.

[0005] This invention is achieved through the following technical solution: A multi-stage screening device for the production and processing of organic fertilizer from coal gangue includes a multi-stage screening mechanism, a primary screening mechanism, a secondary screening mechanism, a return mechanism, a light and heavy mineral screening mechanism, and a mud-water separation mechanism. The multi-stage screening mechanism includes a screening box, a primary screening plate, and a secondary screening plate. The primary screening plate is located at the top inside the screening box, and the secondary screening plate is located inside the screening box, below the primary screening plate. The coal gangue is screened in multiple stages using the primary and secondary screening plates. Both the primary and secondary screening plates are inclined, and their inclination directions are opposite. The primary screening plate is connected to the primary screening mechanism. The primary screening mechanism crushes the material on the primary screening plate; the secondary screening plate is connected to the secondary screening mechanism, which grinds the material on the secondary screening plate; the primary and secondary screening mechanisms are respectively connected to the return material mechanism, which returns the ground and crushed coal gangue to the screening box for further screening; the light and heavy mineral screening mechanism is located below the outlet of the multi-stage screening mechanism to separate the light and heavy minerals in the coal gangue after multi-stage screening; the mud-water separation mechanism is located below the light and heavy mineral screening mechanism to separate the material undersize from the light and heavy mineral screening mechanism.

[0006] Furthermore, the multi-stage screening mechanism also includes a base, support columns, support springs, a feed chute, partitions, guide plates, and guide cylinders. There are four support columns, all of which are fixedly installed on the top of the base. The support springs are fixedly installed on the top of the support columns. The screening box is fixedly installed on the support springs at the top of the four support columns. The feed chute is fixedly installed on the top of the screening box. There are two partitions, which are fixedly installed on the left and right ends inside the screening box, respectively. The primary screening plate and the secondary screening plate are both located between the two partitions. The guide plate is fixedly installed inside the screening box and located below the secondary screening plate. The top of the guide cylinder is connected to the bottom of the guide plate, and the bottom of the guide cylinder extends to the outside of the bottom of the screening box.

[0007] Furthermore, the primary screening and processing mechanism includes a crushing box, which is located at the right end of the screening box; the crushing box receives and crushes coal gangue that has not passed through the primary screening plate; The primary screening and processing mechanism also includes a primary collection box, crushing rollers, gears, a dual-shaft motor, left and right eccentric wheels, a first transmission belt, and a primary material guide channel. The primary collection box is fixedly installed on the lowest side of the primary screening plate. The top of the crushing box is connected to the bottom of the primary collection box. Two interlocking crushing rollers are rotatably installed inside the crushing box, and both ends of the crushing rollers extend to the front and rear sides of the crushing box through rotating shafts. There are two gears, which are fixedly sleeved on the front side of the two crushing rollers and mesh with each other. The dual-shaft motor is located inside the screening box on the right side of the crushing box. There are two left and right eccentric wheels, which are fixedly sleeved on the two output shafts of the dual-shaft motor. The left and right eccentric wheels indirectly contact the screening box when rotating. The two ends of the first transmission belt are respectively sleeved on the rear side of one crushing roller and one output shaft of the dual-shaft motor. One end of the primary material guide channel is connected to the bottom of the crushing box.

[0008] Furthermore, the secondary screening and processing mechanism includes a grinding box, which is located at the left end inside the screening box. The grinding box receives and grinds the coal gangue that has not passed through the secondary screening plate. The secondary screening and processing mechanism also includes a secondary collection box, a feed hopper, a feed inlet, a grinding head, a rotating shaft, a vertical motor, front and rear eccentric wheels, and a secondary guide channel. The secondary collection box is fixedly installed on one side of the lowest end of the secondary screening plate. The feed hopper is fixedly installed inside the bottom of the secondary collection box. The top of the grinding box is fixedly installed at the bottom of the feed hopper. The feed inlet is located in the middle of the grinding box and communicates with the feed hopper. The grinding head is located inside the grinding box. The rotating shaft is movably installed in the middle of the bottom end of the grinding box. The grinding head is fixedly installed at the top of the rotating shaft. The vertical motor is fixedly installed at the bottom left end of the screening box. The output shaft of the vertical motor is fixedly connected to the rotating shaft. The front and rear eccentric wheels are fixedly sleeved on the output shaft of the vertical motor. One end of the secondary guide channel communicates with the bottom end of the grinding box.

[0009] Furthermore, the return material mechanism includes a lifting screw shaft, which is located in the middle of the outer rear end of the screening box. The lifting screw shaft transports the coal gangue that has been processed by the primary screening mechanism and the secondary screening mechanism, so that it re-enters the screening box.

[0010] Furthermore, the material return mechanism also includes a material return box, a support frame, a material return cylinder, a feed cylinder, a connecting sleeve, a lifting motor, and a discharge cylinder. The material return box is fixedly installed in the middle of the bottom of the screening box and is connected to the primary and secondary material guide channels. The rear end of the material return box extends out of the rear side wall of the screening box. The bottom end of the support frame is fixedly installed on the top of the base and is located in the middle of the rear side of the screening box. The middle of the material return cylinder is fixedly installed in the middle of the top of the support frame. The feed cylinder is fixedly installed on the bottom end of the material return cylinder near the screening box and is sleeved on the rear end of the material return box. The two ends of the connecting sleeve are fixedly connected to the rear end of the material return box and the feed cylinder, respectively. The lifting screw shaft is movably installed inside the material return cylinder. The lifting motor is fixedly installed inside the material return box, and its output shaft is fixedly connected to the bottom end of the lifting screw shaft. The discharge cylinder is fixedly installed on the top of the material return cylinder, and the end of the discharge cylinder away from the material return cylinder is connected to the feed chute.

[0011] Furthermore, the light and heavy mineral screening mechanism includes a fixed frame, a screening bed, a slurry tank, a clear water tank, an inlet pipe, a distribution pipe, a reciprocating drive box, a screening motor, and a second transmission belt. The screening bed is located between the base and the screening box. There are four fixed frames, all of which are fixedly installed on the top of the base. The screening bed is movably installed on the top of the four fixed frames. The slurry tank is fixedly installed on the rear left side of the screening bed, and the clear water tank is fixedly installed on the rear right side of the screening bed. The bottoms of the slurry tank and the clear water tank are connected to the screening bed. The inlet pipe is fixedly installed in the middle of the support frame. The two ends of the distribution pipe are movably installed in the top of the slurry tank and the clear water tank, respectively, and the middle of the distribution pipe is connected to the inlet pipe. The reciprocating drive box is fixedly installed on the left side of the base. The reciprocating drive box contains a reciprocating rod and an input shaft. The reciprocating rod is fixedly connected to the middle of the left side of the screening bed. The screening motor is fixedly installed on the rear left side of the base. The two ends of the second transmission belt are movably connected to the output shaft of the screening motor and the input shaft of the reciprocating drive box, respectively.

[0012] Furthermore, the mud-water separation mechanism includes a collection frame, a separation cylinder, a cylinder cover, a drain pipe, an inner cylinder, filter rods, a rotating disc, a filter motor, and a scraper frame; the collection frame is located below the screening bed, the separation cylinder is located on the base and is in communication with the collection frame; the cylinder cover is fixedly installed at the top of the separation cylinder, the drain pipe is located at the bottom of the side wall of the separation cylinder, the inner cylinder is movably installed inside the separation cylinder, and several filter rods are evenly embedded in the side wall of the inner cylinder; by driving the inner cylinder to rotate at high speed, the water in the inner cylinder is discharged through the filter rods; A base plate is fixedly installed at the bottom of the separator cylinder, and the base plate is located below the drain pipe. The rotating disk is movably set above the base plate. The water filter motor is fixedly installed in the middle of the bottom of the separator cylinder. The output shaft of the water filter motor passes through the middle of the base plate and is fixedly connected to the middle of the bottom of the rotating disk. There are several scraper frames, which are evenly fixedly installed on the inner wall of the separator cylinder. The scraper frames are in contact with the water filter rod.

[0013] Furthermore, the vibration mechanism includes a connecting shaft, a vibrating plate, a torsion spring, a pop-out groove, a lifting rod, and a scraper. The connecting shaft is fixedly installed on the base plate and located below the rotating disk. One end of the vibrating plate is movably sleeved in the middle of the connecting shaft. The torsion spring is located between the base plate and the vibrating plate. The pop-out groove is opened on the rotating disk and its length is greater than the length of the vibrating plate. The lifting rod is located inside the inner cylinder. The scraper is movably located at the bottom of the inner cylinder. The bottom end of the lifting rod is fixedly installed in the middle of the scraper.

[0014] A multi-stage screening method for the production and processing of organic fertilizer from coal gangue, based on the aforementioned multi-stage screening equipment, includes the following steps: S1. Coal gangue for organic fertilizer production and processing is introduced into the screening box. The coal gangue is first screened on the primary screening plate. The coal gangue passing through the primary screening plate falls onto the secondary screening plate, so that the coal gangue that has passed the primary screening is screened on the secondary screening plate. The coal gangue that passes through the secondary screening plate falls onto the guide plate. After being guided and collected by the guide plate, it enters the guide cylinder. The coal gangue that has undergone two screenings is introduced into the slurry tank through the guide cylinder. Water is supplied to the water distribution pipe through the water inlet pipe. Clean water is introduced into the slurry tank and the clean water tank at both ends of the water distribution pipe. The reciprocating rod in the reciprocating drive box drives the screening bed to continuously reciprocate, so that light and heavy minerals are separated on the screening bed. S2. During the primary screening, the coal gangue that does not pass through the primary screening plate enters the primary collection box. The coal gangue entering the primary collection box is crushed by the crushing roller. The crushed coal gangue is then guided into the return box through the primary guide channel. At the same time, the crushing roller is driven to rotate by the dual-shaft motor, which also drives the left and right eccentric wheels to rotate, causing the entire screening box to sway left and right to improve the screening effect. S3. During secondary screening, coal gangue that does not pass through the secondary screening plate enters the secondary collection box, where it is ground. The ground coal gangue is then guided into the return box through the secondary guide channel. At the same time, the vertical motor drives the grinding head to rotate, which in turn drives the front and rear eccentric wheels to rotate, causing the entire screening box to sway back and forth, thereby further improving the screening effect. S4. The coal gangue that has been crushed after primary screening and ground after secondary screening is collected in the return box. The coal gangue that has entered the return box from the feed cylinder is driven to rise continuously by the lifting screw shaft. Then it returns to the feed trough through the discharge cylinder and then returns to the screening box to continue screening. S5. The water containing light minerals flowing out of the screening bed flows into the collection frame and then into the inner cylinder. The water filter motor drives the rotating disc to rotate, which in turn drives the inner cylinder to rotate at high speed. This causes the water in the inner cylinder to be discharged through the filter rods. When the inner cylinder rotates, it drives the filter rods to contact the scraper frame. The scraper frame squeezes the filter rods, which accelerates the discharge of water. After the separation is completed, the inner cylinder is removed and the lifting rod is pulled outward to drive the scraper to remove the light mineral mud from the inner cylinder. When the rotating disc rotates, when the ejection groove moves above the vibrating plate, the spring force of the torsion spring causes the vibrating plate to be ejected from the ejection groove. The ejected vibrating plate strikes the bottom of the inner cylinder, causing the sludge inside the inner cylinder to be concentrated onto the scraper through vibration.

[0015] The beneficial effects of this invention compared to the prior art are as follows: This invention optimizes the feeding and screening structure to achieve efficient and continuous multi-stage screening and separation of light and heavy minerals. Coal gangue is continuously fed into the screening box via the feeding chute and then classified sequentially on the primary and secondary screening plates. Materials that do not pass screening enter the primary and secondary collection boxes, respectively, while the fine materials that pass through the two-stage screening are guided into the slurry tank via the guide plate and guide cylinder. During this process, the reciprocating rod in the reciprocating drive box driven by the screening motor drives the screening bed to move back and forth continuously, so that light and heavy minerals are effectively separated on the screening bed. In particular, it can accurately separate heavy minerals such as pyrite from light minerals, preventing them from entering the soil and causing acidification. This structure not only solves the problem of low throughput caused by continuous feeding in existing equipment, but also achieves the simultaneous separation of key harmful components in coal gangue, significantly improving screening efficiency and product quality.

[0016] 2. This invention achieves fully automated operation by seamlessly integrating screening and refining processes, significantly improving production efficiency. After primary screening, unpassed coal gangue enters the primary collection box, where it is crushed by a dual-shaft motor-driven crushing roller and fed into the return box. After secondary screening, unpassed coal gangue enters the secondary collection box and then enters the grinding box through the feed hopper. It is ground by a vertical motor-driven grinding head and fed into the return box. The processed product collected in the return box is lifted by a lifting motor-driven lifting screw shaft and sent back to the feed trough for further screening, forming a closed-loop process. Simultaneously, during the crushing and grinding processes, the screening box is shaken by left-right and front-back eccentric wheels, further improving the screening effect and solving the problem of low efficiency caused by manual connection. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure is provided for embodiments of the present invention; Figure 2 This is a schematic diagram of the internal structure of the screening box provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure between the partitions provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a primary screening and processing mechanism provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a two-stage screening and processing mechanism provided in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the feed hopper and a schematic diagram of the grinding head structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the material return mechanism provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the return cylinder provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of a light and heavy mineral screening mechanism provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the separation cylinder structure provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the internal cross-sectional structure of the separation cylinder provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the inner cylinder structure provided in an embodiment of the present invention; Figure 13 This is a schematic diagram of the internal three-dimensional structure of the separation cylinder provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the vibration mechanism provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the scraper structure provided in an embodiment of the present invention.

[0018] In the diagram: 1. Base; 2. Multi-stage screening mechanism; 21. Support column; 22. Support spring; 23. Screening box; 24. Feed chute; 25. Baffle plate; 26. Primary screening plate; 27. Secondary screening plate; 28. Guide plate; 29. ​​Guide cylinder; 3. Primary screening processing mechanism; 31. Primary collection box; 32. Crushing box; 33. Crushing roller; 34. Gear; 35. Dual-shaft motor; 36. Left and right eccentric wheels; 37. First transmission belt; 38. Primary guide channel; 4. Secondary screening processing mechanism; 41. Secondary collection box; 42. Feed hopper; 43. Grinding box; 44. Feed inlet; 45. Grinding head; 46. Rotating shaft; 47. Vertical motor; 48. Front and rear eccentric wheels; 49. Secondary guide channel; 5. Return mechanism; 51 51. Return material box; 52. Support frame; 53. Return material cylinder; 54. Feed cylinder; 55. Connecting sleeve; 56. Lifting screw shaft; 57. Lifting motor; 58. Discharge cylinder; 6. Light and heavy mineral screening mechanism; 61. Fixed frame; 62. Screening bed; 63. Slurry tank; 64. Clear water tank; 65. Water inlet pipe; 66. Water distribution pipe; 67. Reciprocating drive box; 68. Screening motor; 69. Second transmission belt; 7. Mud-water separation mechanism; 71. Collection frame; 72. Separation cylinder; 73. Cylinder cover; 74. Drain pipe; 75. Inner cylinder; 76. Filter rod; 77. Rotary disc; 78. Filter motor; 79. Scraper frame; 8. Vibration mechanism; 81. Connecting shaft; 82. Vibrating plate; 83. Torsion spring; 84. Pop-out groove; 85. Lifting rod; 86. Scraper. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto. Example 1

[0020] Please see Figures 1 to 15 This embodiment proposes a multi-stage screening equipment based on the production and processing of coal gangue organic fertilizer, including a base 1, a multi-stage screening mechanism 2, a primary screening processing mechanism 3, a secondary screening processing mechanism 4, a return material mechanism 5, a light and heavy mineral screening mechanism 6, a mud-water separation mechanism 7, and a vibration mechanism 8.

[0021] The multi-stage screening mechanism 2 includes a screening box 23, a primary screening plate 26, and a secondary screening plate 27. The screening box 23 is located above the base 1, the primary screening plate 26 is located at the top inside the screening box 23, and the secondary screening plate 27 is located inside the screening box 23 and below the primary screening plate 26. The coal gangue is screened in multiple stages through the primary screening plate 26 and the secondary screening plate 27. Both the primary screening plate 26 and the secondary screening plate 27 are inclined structures, and their inclination directions are opposite.

[0022] In this embodiment, as Figures 1 to 3 As shown, the multi-stage screening mechanism 2 also includes support columns 21, support springs 22, feed troughs 24, partitions 25, guide plates 28, and guide cylinders 29. There are four support columns 21, all of which are fixedly installed on the top of the base 1. The support springs 22 are fixedly installed on the top of the support columns 21. The screening box 23 is fixedly installed on the support springs 22 at the top of the four support columns 21. The feed trough 24 is fixedly installed on the top of the screening box 23. There are two partitions 25, which are fixedly installed on the left and right ends inside the screening box 23, respectively. The first-stage screening plate 26 and the second-stage screening plate 27 are both arranged between the two partitions 25. The guide plate 28 is fixedly installed inside the screening box 23 and is located below the second-stage screening plate 27. The top of the guide cylinder 29 is connected to the bottom of the guide plate 28, and the bottom of the guide cylinder 29 extends to the outside of the bottom of the screening box 23.

[0023] Coal gangue is fed into screening box 23 through feed chute 24. The coal gangue is first screened on primary screening plate 26. The coal gangue passing through primary screening plate 26 falls onto secondary screening plate 27, so that the coal gangue that has passed primary screening is screened on secondary screening plate 27. The coal gangue passing through secondary screening plate 27 falls onto guide plate 28, and after being guided and collected by guide plate 28, it enters guide cylinder 29.

[0024] like Figure 2 and Figure 4 As shown, the primary screening and processing mechanism 3 includes a crushing box 32, which is located at the right end of the inside of the screening box 23; the crushing box 32 receives and crushes the coal gangue that has not passed through the primary screening plate 26.

[0025] In this embodiment, as Figure 2 and Figure 4As shown, the primary screening and processing mechanism 3 also includes a primary collection box 31, crushing rollers 33, gears 34, a dual-shaft motor 35, left and right eccentric wheels 36, a first transmission belt 37, and a primary material guide channel 38. The primary collection box 31 is fixedly installed on the lowest side of the primary screening plate 26. The top of the crushing box 32 is connected to the bottom of the primary collection box 31. Two interlocking crushing rollers 33 are rotatably arranged inside the crushing box 32, and both ends of the crushing rollers 33 extend to the front and rear sides of the crushing box 32 through rotating shafts. There are two gears 34, which are respectively fixedly sleeved on the rotating shafts of the two crushing rollers 33 located in the crushing box. At the front end of the crushing box 32, two gears 34 mesh with each other. The dual-shaft motor 35 is located inside the screening box 23 and on the right side of the crushing box 32. There are two left and right eccentric wheels 36, which are fixedly sleeved on the two output shafts of the dual-shaft motor 35 respectively. When the left and right eccentric wheels 36 rotate, they indirectly contact the screening box 23. One end of the first transmission belt 37 is sleeved on the shaft of one of the crushing rollers 33 located at the rear end of the crushing box 32. The other end of the first transmission belt 37 is sleeved on one of the output shafts of the dual-shaft motor 35. One end of the primary material guide channel 38 is connected to the bottom end of the crushing box 32.

[0026] The crushing roller 33 is driven to rotate by the dual-shaft motor 35 and the first transmission belt 37, and the other crushing roller 33 is driven to rotate simultaneously by the gear 34, which crushes the coal gangue entering the primary collection box 31. The crushed coal gangue is then guided into the return material mechanism 5 through the primary material guide channel 38. At the same time, the dual-shaft motor 35 drives the crushing roller 33 to rotate, which drives the left and right eccentric wheel 36 to rotate, causing the screening box 23 to sway left and right as a whole, which further improves the screening effect.

[0027] like Figure 2 , Figure 5 and Figure 6 As shown, the secondary screening and processing mechanism 4 includes a grinding box 43, which is located at the left end of the screening box 23. The grinding box 43 receives and grinds the coal gangue that has not passed through the secondary screening plate 27.

[0028] The secondary screening and processing mechanism 4 also includes a secondary collection box 41, a feed hopper 42, a feed inlet 44, a grinding head 45, a rotating shaft 46, a vertical motor 47, a front and rear eccentric wheel 48, and a secondary guide channel 49. The secondary collection box 41 is fixedly installed on one side of the lowest end of the secondary screening plate 27. The feed hopper 42 is fixedly installed inside the bottom end of the secondary collection box 41. The top end of the grinding box 43 is fixedly installed at the bottom end of the feed hopper 42. The feed inlet 44 is opened in the middle of the grinding box 43 and communicates with the feed hopper 42. The grinding head 45 is located inside the grinding box 43. The rotating shaft 46 is movably installed in the middle of the bottom end of the grinding box 43. The grinding head 45 is fixedly installed at the top end of the rotating shaft 46. The vertical motor 47 is fixedly installed at the bottom left end of the screening box 23. The output shaft of the vertical motor 47 is fixedly connected to the rotating shaft 46. The front and rear eccentric wheel 48 is fixedly sleeved on the output shaft of the vertical motor 47. One end of the secondary guide channel 49 communicates with the bottom end of the grinding box 43.

[0029] The vertical motor 47 drives the rotating shaft 46 to rotate, which in turn drives the grinding head 45 to rotate, thus grinding the coal gangue falling from the feed inlet 44. The ground coal gangue is then guided into the return material mechanism 5 through the secondary material guide channel 49. At the same time, the vertical motor 47 drives the grinding head 45 to rotate, which in turn drives the front and rear eccentric wheel 48 to rotate, causing the screening box 23 to sway back and forth, further improving the screening effect.

[0030] like Figure 7 and Figure 8 As shown, the return material mechanism 5 includes a lifting screw shaft 56, which is located in the middle of the outer rear end of the screening box 23. The lifting screw shaft 56 transports the coal gangue after it has been processed by the crushing box 32 and the grinding box 43, so that it can re-enter the screening box 23.

[0031] The material return mechanism 5 also includes a material return box 51, a support frame 52, a material return cylinder 53, a feed cylinder 54, a connecting sleeve 55, a lifting motor 57, and a discharge cylinder 58. The material return box 51 is fixedly installed in the middle of the bottom of the screening box 23 and is connected to the primary guide channel 38 and the secondary guide channel 49. The rear end of the material return box 51 extends out of the rear side wall of the screening box 23. The bottom end of the support frame 52 is fixedly installed on the top of the base 1 and is located in the middle of the rear side of the screening box 23. The middle of the material return cylinder 53 is fixedly installed in the middle of the top of the support frame 52. The feed cylinder 54 is fixedly installed at the bottom of the return cylinder 53 near the screening box 23 and is sleeved on the rear end of the return box 51. The two ends of the connecting sleeve 55 are fixedly connected to the rear end of the return box 51 and the feed cylinder 54, respectively. The lifting screw shaft 56 is movably installed inside the return cylinder 53. The lifting motor 57 is fixedly installed inside the return box 51 and its output shaft is fixedly connected to the bottom end of the lifting screw shaft 56. The discharge cylinder 58 is fixedly installed at the top of the return cylinder 53 and the end of the discharge cylinder 58 away from the return cylinder 53 is connected to the feed trough 24.

[0032] The lifting motor 57 drives the lifting screw shaft 56 to rotate, which in turn drives the coal gangue entering the return cylinder 53 from the feed cylinder 54 to rise continuously. Then, it returns to the feed trough 24 through the discharge cylinder 58 and returns to the screening box 23 for further screening.

[0033] like Figure 9 As shown, the light and heavy mineral screening mechanism 6 includes a screening bed 62, which is set between the base 1 and the screening box 23. The screening bed 62 is used to screen light minerals in coal gangue for organic fertilizer production.

[0034] The light and heavy mineral screening mechanism 6 also includes a fixed frame 61, a slurry tank 63, a clear water tank 64, a water inlet pipe 65, a water distribution pipe 66, a reciprocating drive box 67, a screening motor 68, and a second transmission belt 69. There are four fixed frames 61, all of which are fixedly installed on the top of the base 1. The screening bed 62 is movably installed on the top of the four fixed frames 61. The slurry tank 63 is fixedly installed on the rear left side of the screening bed 62, and the clear water tank 64 is fixedly installed on the rear right side of the screening bed 62. The bottoms of the slurry tank 63 and the clear water tank 64 are connected to the screening bed 62.

[0035] The inlet pipe 65 is fixedly installed in the middle of the support frame 52. The two ends of the water distribution pipe 66 are respectively movably installed in the top of the slurry tank 63 and the clear water tank 64, and are connected to the inlet pipe 65 in the middle. The reciprocating drive box 67 is fixedly installed in the left end of the base 1. The reciprocating drive box 67 is provided with a reciprocating rod and an input shaft. The reciprocating rod is fixedly connected to the middle of the left end of the screening bed 62. The screening motor 68 is fixedly installed in the rear left end of the base 1. The two ends of the second transmission belt 69 are movably connected to the output shaft of the screening motor 68 and the input shaft of the reciprocating drive box 67, respectively.

[0036] Water is supplied to the distribution pipe 66 through the inlet pipe 65. Clean water is simultaneously introduced into the slurry tank 63 and the clear water tank 64 through both ends of the distribution pipe 66. Then, the screening motor 68 is started, and the reciprocating rod in the reciprocating drive box 67 is driven by the second transmission belt 69 to drive the screening bed 62 to continuously reciprocate, so that light and heavy minerals are separated on the screening bed 62.

[0037] like Figures 10 to 13 As shown, the mud-water separation mechanism 7 includes a collection frame 71 and a separation cylinder 72. The collection frame 71 is located below the screening bed 62, and the separation cylinder 72 is located on the base 1 and is in communication with the collection frame 71.

[0038] The mud-water separation mechanism 7 also includes a cylinder cover 73, a drain pipe 74, an inner cylinder 75, and filter rods 76. The cylinder cover 73 is fixedly installed on the top of the separation cylinder 72, the drain pipe 74 is located at the bottom of the side wall of the separation cylinder 72, and the inner cylinder 75 is movably installed inside the separation cylinder 72. Several filter rods 76 are evenly embedded in the side wall of the inner cylinder 75. By driving the inner cylinder 75 to rotate at high speed, the water in the inner cylinder 75 is discharged through the filter rods 76. The filter rods 76 are water-absorbing sponge rods.

[0039] The mud-water separation mechanism 7 also includes a rotating disk 77, a water filter motor 78, and a scraper frame 79. A base plate is fixedly installed at the bottom of the separation cylinder 72, and the base plate is located below the drain pipe 74. The rotating disk 77 is movably arranged above the base plate. The water filter motor 78 is fixedly installed in the middle of the bottom of the separation cylinder 72. The output shaft of the water filter motor 78 passes through the middle of the base plate and is fixedly connected to the middle of the bottom of the rotating disk 77. There are several scraper frames 79, which are evenly fixedly installed on the inner wall of the separation cylinder 72. The scraper frame 79 is in contact with the water filter rod 76.

[0040] The water filter motor 78 drives the rotating disk 77 to rotate, which in turn drives the inner cylinder 75 to rotate at high speed. This causes the water in the inner cylinder 75 to be discharged through the water filter rod 76. When the inner cylinder 75 rotates, it causes the water filter rod 76 to come into contact with the scraper frame 79. The scraper frame 79 squeezes the water filter rod 76, which accelerates the discharge of water and keeps the water filter rod 76 in a water absorption capacity. Under the high-speed rotation of the inner cylinder 75, the valuable lightweight mineral mud is retained in the inner cylinder 75.

[0041] like Figure 14 and Figure 15 As shown, the vibration mechanism 8 includes a connecting shaft 81, a vibrating plate 82, a torsion spring 83, a pop-out groove 84, a lifting rod 85, and a scraper 86. The connecting shaft 81 is fixedly installed on the base plate and located below the rotating disk 77. One end of the vibrating plate 82 is movably sleeved in the middle of the connecting shaft 81. The torsion spring 83 is disposed between the base plate and the vibrating plate 82. The pop-out groove 84 is opened on the rotating disk 77 and its length is greater than the length of the vibrating plate 82. The vibrating plate 82 can extend out from the pop-out groove 84. The lifting rod 85 is located inside the inner cylinder 75, and the scraper 86 is movably located at the bottom of the inner cylinder 75. The bottom end of the lifting rod 85 is fixedly installed in the middle of the scraper 86.

[0042] When the drive disc 77 rotates, the disc 77 first presses down the vibrating plate 82. At this time, the torsion spring 83 is compressed. When the ejection slot 84 rotates above the vibrating plate 82, the vibrating plate 82 is ejected from the ejection slot 84 by the elastic force of the torsion spring 83. The ejected vibrating plate 82 strikes the bottom of the inner cylinder 75, causing the sludge in the inner cylinder 75 to be concentrated on the scraper 86 after vibration. Then, the light sludge can be taken out by pulling out the lifting rod 85. Example 2

[0043] This embodiment proposes a multi-stage screening method for the production and processing of organic fertilizer from coal gangue, based on the multi-stage screening equipment described in Embodiment 1, and includes the following steps: S1. Coal gangue for organic fertilizer production and processing is fed into the screening box 23 through the feed chute 24. The coal gangue is first screened on the primary screening plate 26. The coal gangue passing through the primary screening plate 26 falls onto the secondary screening plate 27, so that the coal gangue that has passed through the primary screening is screened on the secondary screening plate 27. The coal gangue that passes through the secondary screening plate 27 falls onto the guide plate 28. After being guided and collected by the guide plate 28, it enters the guide cylinder 29, so that the coal gangue that has undergone two screenings is fed into the slurry tank 63 through the guide cylinder 29. Water is supplied to the water distribution pipe 66 through the water inlet pipe 65. Clean water is simultaneously introduced into the slurry tank 63 and the clean water tank 64 through both ends of the water distribution pipe 66. Then the screening motor 68 is started, and the reciprocating rod in the reciprocating drive box 67 is driven by the second transmission belt 69 to drive the screening bed 62 to continuously reciprocate, so that light and heavy minerals are separated on the screening bed 62.

[0044] S2. During primary screening, coal gangue that fails to pass through the primary screening plate 26 enters the primary collection box 31. The dual-shaft motor 35 is started, which drives one crushing roller 33 to rotate via the first transmission belt 37, and drives another crushing roller 33 to rotate simultaneously via the gear 34, so as to crush the coal gangue entering the primary collection box 31. The crushed coal gangue is then guided into the return box 51 through the primary guide channel 38. While the dual-shaft motor 35 drives the crushing roller 33 to rotate, it also drives the left and right eccentric wheel 36 to rotate, so that the screening box 23 as a whole shakes left and right, further improving the screening effect.

[0045] S3. During secondary screening, coal gangue that fails to pass through the secondary screening plate 27 enters the secondary collection box 41 and then enters the feed inlet 44 of the grinding box 43 through the feed hopper 42. The vertical motor 47 is started to drive the rotating shaft 46 to rotate, which in turn drives the grinding head 45 to rotate, so as to grind the coal gangue falling from the feed inlet 44. The ground coal gangue is then guided into the return box 51 through the secondary guide channel 49. At the same time, the vertical motor 47 drives the grinding head 45 to rotate, which in turn drives the front and rear eccentric wheel 48 to rotate, causing the entire screening box 23 to sway back and forth, which further improves the screening effect.

[0046] S4. The coal gangue that has undergone primary screening, crushing, and secondary screening and grinding are all collected in the return box 51 and guided into the feed cylinder 54. The lifting motor 57 is started, which drives the lifting screw shaft 56 to rotate. The lifting screw shaft 56 drives the coal gangue that has entered the return cylinder 53 from the feed cylinder 54 to rise continuously. Then, it returns to the feed trough 24 through the discharge cylinder 58 and then returns to the screening box 23 to continue screening.

[0047] S5. Water containing light minerals flowing out of the screening bed 62 flows into the collection frame 71. The collection frame 71 collects the sludge water into the separation cylinder 72 and then into the inner cylinder 75. The water filter motor 78 is started, which drives the rotating disk 77 to rotate, thereby driving the inner cylinder 75 to rotate at high speed. This causes the water in the inner cylinder 75 to be discharged through the water filter rod 76. When the inner cylinder 75 rotates, it causes the water filter rod 76 to come into contact with the scraper frame 79. The scraper frame 79 squeezes the water filter rod 76, which accelerates the discharge of water and keeps the water filter rod 76 absorbent. Under the high-speed rotation of the inner cylinder 75, the usable light sludge is left in the inner cylinder 75. After separation, the cylinder cover 73 can be unscrewed, the inner cylinder 75 can be taken out, and the lifting rod 85 can be pulled out to drive the scraper 86 to take out the light sludge in the inner cylinder 75.

[0048] When the rotating disk 77 rotates, it first presses down the vibrating plate 82. At this time, the torsion spring 83 is compressed. When the ejection groove 84 rotates to above the vibrating plate 82, the vibration plate 82 is ejected from the ejection groove 84 by the elastic force of the torsion spring 83. The ejected vibrating plate 82 strikes the bottom of the inner cylinder 75, causing the sludge in the inner cylinder 75 to be concentrated on the scraper 86 by vibration and taken out together with the light sludge.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue, characterized in that, It includes a multi-stage screening mechanism (2), a primary screening processing mechanism (3), a secondary screening processing mechanism (4), a return material mechanism (5), a light and heavy mineral screening mechanism (6), and a mud-water separation mechanism (7); the multi-stage screening mechanism (2) includes a screening box (23), a primary screening plate (26), and a secondary screening plate (27). The primary screening plate (26) is located at the top inside the screening box (23), and the secondary screening plate (27) is located inside the screening box (23) and below the primary screening plate (26); the coal gangue is screened in multiple stages through the primary screening plate (26) and the secondary screening plate (27); both the primary screening plate (26) and the secondary screening plate (27) are inclined structures, and their inclination directions are opposite; the primary screening plate (26) is connected to the primary screening processing mechanism (3), and the process is completed by the primary screening mechanism (3). The material on the first-stage screening plate (26) is crushed by the first-stage screening mechanism (3); the second-stage screening plate (27) is connected to the second-stage screening mechanism (4), and the material on the second-stage screening plate (27) is ground by the second-stage screening mechanism (4); the first-stage screening mechanism (3) and the second-stage screening mechanism (4) are respectively connected to the return material mechanism (5), and the ground and crushed coal gangue is sent back to the screening box (23) for screening by the return material mechanism (5); the light and heavy mineral screening mechanism (6) is set below the outlet of the multi-stage screening mechanism (2) to separate the light and heavy minerals of the coal gangue after multi-stage screening; the mud-water separation mechanism (7) is set below the light and heavy mineral screening mechanism (6) to separate the material under the light and heavy minerals of the light and heavy mineral screening mechanism (6).

2. The multi-stage screening equipment for the production and processing of organic fertilizer based on coal gangue according to claim 1, characterized in that, It also includes a base (1), a multi-stage screening mechanism (2) and support columns (21), support springs (22), a feed chute (24), a partition (25), a guide plate (28), and a guide cylinder (29). There are four support columns (21), all of which are fixedly installed on the top of the base (1). The support springs (22) are fixedly installed on the top of the support columns (21). The screening box (23) is fixedly installed on the support springs (22) at the top of the four support columns (21). The feed chute (24) is fixedly installed on the screen. At the top of the screening box (23), there are two partitions (25), which are fixedly installed at the left and right ends of the screening box (23) respectively. The primary screening plate (26) and the secondary screening plate (27) are both set between the two partitions (25). The guide plate (28) is fixedly installed inside the screening box (23) and located below the secondary screening plate (27). The top of the guide cylinder (29) is connected to the bottom of the guide plate (28), and the bottom of the guide cylinder (29) extends to the outside of the bottom of the screening box (23).

3. The multi-stage screening equipment for the production and processing of organic fertilizer based on coal gangue according to claim 2, characterized in that, The primary screening and processing mechanism (3) includes a crushing box (32), which is located at the right end of the inside of the screening box (23); the crushing box (32) receives and crushes coal gangue that has not passed through the primary screening plate (26); The primary screening and processing mechanism (3) also includes a primary collection box (31), crushing rollers (33), gears (34), a dual-shaft motor (35), left and right eccentric wheels (36), a first transmission belt (37), and a primary guide channel (38). The primary collection box (31) is fixedly installed on the lowest side of the primary screening plate (26). The top of the crushing box (32) is connected to the bottom of the primary collection box (31). Two interlocking crushing rollers (33) are rotatably arranged inside the crushing box (32), and both ends of the crushing rollers (33) extend to the front and rear sides of the crushing box (32) through rotating shafts. There are two gears (34), which are fixedly sleeved on the two crushing rollers respectively. The roller (33) is located at one end of the front side of the crushing box (32), and the two gears (34) mesh with each other. The dual-shaft motor (35) is set inside the screening box (23) and located on the right side of the crushing box (32). There are two left and right eccentric wheels (36), which are respectively fixedly sleeved on the two output shafts of the dual-shaft motor (35). The left and right eccentric wheels (36) are indirectly in contact with the screening box (23) when rotating. The two ends of the first transmission belt (37) are respectively sleeved on one end of the crushing roller (33) located at the rear side of the crushing box (32) and one output shaft of the dual-shaft motor (35). One end of the primary material guide channel (38) is connected to the bottom end of the crushing box (32).

4. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 3, characterized in that, The secondary screening and processing mechanism (4) includes a grinding box (43), which is located at the left end of the screening box (23). The grinding box (43) receives and grinds the coal gangue that has not passed through the secondary screening plate (27). The secondary screening and processing mechanism (4) further includes a secondary collection box (41), a feed hopper (42), a feed inlet (44), a grinding head (45), a rotating shaft (46), a vertical motor (47), a front and rear eccentric wheel (48), and a secondary guide channel (49); the secondary collection box (41) is fixedly installed on one side of the lowest end of the secondary screening plate (27), the feed hopper (42) is fixedly installed at the bottom of the secondary collection box (41), the top of the grinding box (43) is fixedly installed at the bottom of the feed hopper (42), and the feed inlet (44) is opened in the grinding box (43). In the middle, and connected to the feed hopper (42), the grinding head (45) is set inside the grinding box (43), the rotating shaft (46) is movably installed in the middle of the bottom end of the grinding box (43), the grinding head (45) is fixedly installed at the top of the rotating shaft (46), the vertical motor (47) is fixedly installed at the bottom left end of the screening box (23), the output shaft of the vertical motor (47) is fixedly connected to the rotating shaft (46), the front and rear eccentric wheels (48) are fixedly sleeved on the output shaft of the vertical motor (47), and one end of the secondary guide channel (49) is connected to the bottom end of the grinding box (43).

5. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 4, characterized in that, The return material mechanism (5) includes a lifting screw shaft (56), which is located in the middle of the outer rear end of the screening box (23). The lifting screw shaft (56) transports the coal gangue after being processed by the primary screening mechanism (3) and the secondary screening mechanism (4) through the lifting screw shaft (56) so that it can re-enter the screening box (23).

6. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 5, characterized in that, The return material mechanism (5) also includes a return material box (51), a support frame (52), a return material cylinder (53), a feed cylinder (54), a connecting sleeve (55), a lifting motor (57), and a discharge cylinder (58). The return material box (51) is fixedly installed in the middle of the bottom of the screening box (23) and is connected to the primary guide channel (38) and the secondary guide channel (49). The rear end of the return material box (51) extends out of the rear side wall of the screening box (23). The bottom end of the support frame (52) is fixedly installed on the top of the base (1) and is located in the middle of the rear side of the screening box (23). The middle of the return material cylinder (53) is fixedly installed on the top of the support frame (52). In the middle, the feed cylinder (54) is fixedly installed on the side of the bottom of the return cylinder (53) near the screening box (23) and sleeved on the back end of the return box (51). The two ends of the connecting sleeve (55) are fixedly connected to the back end of the return box (51) and the feed cylinder (54) respectively. The lifting screw shaft (56) is movably installed inside the return cylinder (53). The lifting motor (57) is fixedly installed inside the return box (51) and the output shaft is fixedly connected to the bottom end of the lifting screw shaft (56). The discharge cylinder (58) is fixedly installed at the top of the return cylinder (53) and the end of the discharge cylinder (58) away from the return cylinder (53) is connected to the feed trough (24).

7. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 6, characterized in that, The light and heavy mineral screening mechanism (6) includes a fixed frame (61), a screening bed (62), a slurry tank (63), a clear water tank (64), a water inlet pipe (65), a water distribution pipe (66), a reciprocating drive box (67), a screening motor (68), and a second transmission belt (69). The screening bed (62) is located between the base (1) and the screening box (23). There are four fixed frames (61), all of which are fixedly installed on the top of the base (1). The screening bed (62) is movably installed on the top of the four fixed frames (61). The slurry tank (63) is fixedly installed on the rear left side of the screening bed (62). The clear water tank (64) is fixedly installed on the rear right side of the screening bed (62). The slurry tank (63) and the clear water tank (64) are connected together. The bottom of each part is connected to the screening bed (62); the water inlet pipe (65) is fixedly installed in the middle of the support frame (52), and the two ends of the water distribution pipe (66) are respectively movably installed in the top of the slurry tank (63) and the clear water tank (64), and the middle of the water distribution pipe (66) is connected to the water inlet pipe (65); the reciprocating drive box (67) is fixedly installed on the left end of the base (1), and the reciprocating drive box (67) is provided with a reciprocating rod and an input shaft, and the reciprocating rod is fixedly connected to the middle of the left end of the screening bed (62); the screening motor (68) is fixedly installed on the rear left end of the base (1), and the two ends of the second transmission belt (69) are respectively movably connected to the output shaft of the screening motor (68) and the input shaft of the reciprocating drive box (67).

8. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 7, characterized in that, The mud-water separation mechanism (7) includes a collection frame (71), a separation cylinder (72), a cylinder cover (73), a drain pipe (74), an inner cylinder (75), filter rods (76), a rotating disc (77), a water filter motor (78), and a scraper frame (79). The collection frame (71) is located below the screening bed (62), and the separation cylinder (72) is located on the base (1) and is connected to the collection frame (71). The cylinder cover (73) is fixedly installed on the top of the separation cylinder (72), the drain pipe (74) is located at the bottom of the side wall of the separation cylinder (72), and the inner cylinder (75) is movably installed inside the separation cylinder (72). Several filter rods (76) are evenly embedded in the side wall of the inner cylinder (75). By driving the inner cylinder (75) to rotate at high speed, the water in the inner cylinder (75) is discharged through the filter rods (76). A base plate is fixedly installed at the bottom of the separator (72), and the base plate is located below the drain pipe (74). The rotating disk (77) is movably set above the base plate. The water filter motor (78) is fixedly installed in the middle of the bottom of the separator (72). The output shaft of the water filter motor (78) passes through the middle of the base plate and is fixedly connected to the middle of the bottom of the rotating disk (77). There are several scraper frames (79), which are evenly fixedly installed on the inner wall of the separator (72). The scraper frame (79) is in contact with the water filter rod (76).

9. A multi-stage screening device for the production and processing of organic fertilizer from coal gangue according to claim 8, characterized in that, The vibration mechanism (8) includes a connecting shaft (81), a vibrating plate (82), a torsion spring (83), a pop-out groove (84), a lifting rod (85), and a scraper (86). The connecting shaft (81) is fixedly installed on the base plate and located below the rotating disk (77). One end of the vibrating plate (82) is movably sleeved in the middle of the connecting shaft (81). The torsion spring (83) is set between the base plate and the vibrating plate (82). The pop-out groove (84) is opened on the rotating disk (77) and its length is greater than that of the vibrating plate (82). The lifting rod (85) is set inside the inner cylinder (75). The scraper (86) is movably set at the bottom of the inner cylinder (75). The bottom end of the lifting rod (85) is fixedly installed in the middle of the scraper (86).

10. A multi-stage screening method for the production and processing of organic fertilizer from coal gangue, characterized in that, Based on the multi-stage screening equipment according to claim 9, and comprising the following steps: S1. Coal gangue for organic fertilizer production and processing is introduced into the screening box (23). The coal gangue is first screened on the primary screening plate (26). The coal gangue passing through the primary screening plate (26) falls onto the secondary screening plate (27), so that the coal gangue that has passed the primary screening is screened on the secondary screening plate (27). The coal gangue that passes through the secondary screening plate (27) falls onto the guide plate (28). After being guided and collected by the guide plate (28), it enters the secondary screening box (23). The coal gangue, after being screened twice, is fed into the slurry tank (63) through the feed cylinder (29). Water is supplied to the water distribution pipe (66) through the water inlet pipe (65). Water is simultaneously introduced into the slurry tank (63) and the clear water tank (64) through both ends of the water distribution pipe (66). The reciprocating rod in the reciprocating drive box (67) drives the screening bed (62) to continuously reciprocate, so that light and heavy minerals are separated on the screening bed (62). S2. During primary screening, coal gangue that does not pass through the primary screening plate (26) enters the primary collection box (31). The coal gangue in the primary collection box (31) is crushed by the crushing roller (33). The crushed coal gangue is then guided into the return box (51) through the primary guide channel (38). At the same time, the crushing roller (33) is driven to rotate by the dual-shaft motor (35), which drives the left and right eccentric wheel (36) to rotate, so that the screening box (23) shakes left and right to improve the screening effect. S3. During secondary screening, the coal gangue that does not pass through the secondary screening plate (27) enters the secondary collection box (41) to grind the coal gangue falling from the feed inlet (44). The ground coal gangue is then guided into the return box (51) through the secondary guide channel (49). At the same time, the vertical motor (47) drives the grinding head (45) to rotate, which in turn drives the front and rear eccentric wheel (48) to rotate, causing the screening box (23) to shake back and forth as a whole, so as to further improve the screening effect. S4. The coal gangue that has been crushed after primary screening and ground after secondary screening is collected in the return box (51). The coal gangue that has entered the return box (53) from the feed cylinder (54) is driven to rise continuously by the lifting screw shaft (56). Then it returns to the feed trough (24) through the discharge cylinder (58) and then returns to the screening box (23) for screening. S5. The water containing light minerals flowing out of the screening bed (62) flows into the collection frame (71) and then into the inner cylinder (75). The water filter motor (78) drives the rotating disk (77) to rotate, thereby driving the inner cylinder (75) to rotate at high speed. This causes the water in the inner cylinder (75) to be discharged through the filter rod (76). When the inner cylinder (75) rotates, it drives the filter rod (76) to contact the scraper (79). The scraper (79) squeezes the filter rod (76) to accelerate the discharge of water. After the separation is completed, the inner cylinder (75) is taken out, and the lifting rod (85) is pulled outward to drive the scraper (86) to remove the light mineral mud in the inner cylinder (75). When the rotating disk (77) rotates, when the ejection groove (84) rotates above the vibrating plate (82), the vibration plate (82) is ejected from the ejection groove (84) by the elastic force of the torsion spring (83). The ejected vibration plate (82) strikes the bottom of the inner cylinder (75), causing the sludge in the inner cylinder (75) to be concentrated onto the scraper (86) by vibration.

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