A heavy medium recovery device for coal washing

Abstract

The present invention discloses a heavy medium recovery device for washing coal, which belongs to the technical field of coal washing equipment. The heavy medium recovery device comprises a shell with a partition provided inside the shell, which divides the interior of the shell into a magnetic separation zone and a purification zone. The top of the magnetic separation zone is rotatably connected to a rotating drum, and the interior of the purification zone is equipped with a purification component, which is used to process the material after magnetic separation and further recover the heavy medium. A drive component is installed on the side of the shell away from the discharge port, and the drive component provides power for the rotating drum and the purification component. The device adopts a multi-stage processing mechanism of magnetic separation-dynamic vibration stratification-gradient magnetic field purification to completely separate impurities from the heavy medium, greatly improve the purity of the heavy medium, and effectively ensure the sorting effect and quality of coal washing.

Description

Technical Field

[0001] The invention belongs to the technical field of coal washing equipment, and in particular relates to a heavy medium recovery device for washing coal. Background Art

[0002] The heavy medium recovery device for coal washing is a key equipment in the coal washing process. Its main function is to efficiently recover heavy medium from the solution after coal washing. The heavy medium acts as a "separator" in the coal washing process. By mixing with coal particles, it uses density differences to separate clean coal from impurities such as gangue. The recovery device can separate the used heavy medium from the solution and recycle it after purification, which not only reduces production costs, but also reduces resource waste, and is of great significance to improving coal washing efficiency and quality.

[0003] However, existing magnetic separators have obvious defects in the heavy medium recovery process: during the magnetic separation process, the magnetic system relies on strong magnetic force to attract the heavy medium, so that the heavy medium is adsorbed on the outer wall of the drum to achieve preliminary separation from the solution; but because the heavy medium adsorption process is fast and lacks fine screening, at the moment of adsorption, the heavy medium is likely to carry non-heavy medium impurities and sandwich these impurities between itself and the drum; as the drum rotates, the adsorbed heavy medium is transported to the collection box together with the entrained impurities, which ultimately leads to a significant reduction in the purity of the heavy medium in the collection box; when the low-purity heavy medium is put into coal washing again, it will affect the sorting effect, reduce the quality of coal washing, increase subsequent processing costs, and limit the efficient development of the coal washing industry.

[0004] Therefore, it is necessary to provide a new heavy medium recovery device for washing coal to solve the above technical problems. Summary of the Invention

[0005] The present invention overcomes the shortcomings of the prior art and proposes a heavy medium recovery device for coal washing. The present invention is achieved through the following technical solutions:

[0006] A heavy medium recovery device for coal washing comprises a shell, with a first side plate and a second side plate on either side of the shell, and a bottom plate at the bottom of the shell; a feed port is provided at the top of one end of the shell, and a discharge port is provided at the first side plate of the shell; a partition is fixedly connected to the interior of the shell, and the partition divides the interior of the shell into a magnetic separation zone and a purification zone, wherein the magnetic separation zone is located on a side of the partition close to the feed port, and the purification zone is located on a side of the partition away from the feed port; a rotating drum is rotatably connected to the top of the magnetic separation zone, and the partition is located on one side of the rotating drum, and the top of the rotating drum is higher than the partition; a first fixed column is installed inside the rotating drum; the first fixed column is fixedly connected to the first side plate, and the rotating drum is rotatably connected to the second side plate; a plurality of first magnetic systems with strong magnetism are fixedly connected to the outer wall of the first fixed column in sequence, and the upper half of the first fixed column and the side adjacent to the purification zone are not covered by the first magnetic system; a purification assembly is installed inside the purification zone, and the purification assembly is used to process the material after magnetic separation and further recover the heavy medium; a drive assembly is installed on the side of the shell away from the discharge port, and the drive assembly provides power to the rotating drum and the purification assembly.

[0007] Furthermore, a guide plate is fixedly connected to the interior of the magnetic separation zone. The guide plate is an arc-shaped plate structure. One end of the guide plate is connected to the feed port, and the other end of the guide plate is connected to the discharge port. The main part of the guide plate is located outside the outer wall of the rotating drum.

[0008] Furthermore, the purification component includes an inclined plate, a vibration plate, a second magnetic system, a sleeve, a connecting rod, a liquid guide groove, a plug sleeve, a first piston, an eccentric wheel, and a second piston; the top of the partition is fixedly connected to the inclined plate, and the magnetically separated material falls from the top of the partition to the inclined plate. A vibration plate is installed below the inclined plate, and the bottom of the vibration plate is fixedly connected to the second magnetic system. One end of the vibration plate is rotatably connected to the first side plate and the second side plate of the shell, and the other end of the vibration plate is fixedly connected to the sleeve. The middle part of the inner wall of the sleeve is rotatably connected to the connecting rod, and the inner wall of the sleeve Liquid guide grooves are provided between the two ends of the shell and the connecting rod, and a plug barrel is fixedly connected to one side of the sleeve inside the shell, and a first piston is slidably connected to the plug barrel. The two ends of the liquid guide grooves close to the rotating cylinder are connected to the plug barrel through pipes, and the two ends of the connecting rod are fixedly connected to eccentric wheels, and the sides of the two eccentric wheels close to each other are rotatably connected to the two ends of the sleeve respectively. The interior of the eccentric wheel is a hollow structure, and the interior of the eccentric wheel is connected to the liquid guide groove. A second piston is provided in the eccentric wheel, and the second piston is slidably connected to the outer wall of the connecting rod.

[0009] Furthermore, the purification component also includes a support plate, a first spring, an active roller, a first driven roller, a second driven roller, a conveyor belt, a third magnetic system, a second fixed column and a fourth magnetic system; the support plate is fixedly connected to the inside of the shell, and multiple groups of first springs are fixedly connected to the top of the support plate at equal intervals, and the top of the first spring is fixedly connected to the bottom of the sleeve; the active roller is rotatably connected to the inside of the purification zone below the vibration plate, and the first driven roller and the second driven roller are rotatably connected to the inside of the purification zone, the first driven roller is located on one side of the active roller in the horizontal direction, and the second driven roller is located above the area between the active roller and the first driven roller; the outer walls of the active roller, the first driven roller and the second driven roller are sleeved with a conveyor belt, and a third magnetic system is provided between the second driven roller and the active roller, and the two sides of the third magnetic system are fixedly connected to the first side plate and the second side plate respectively, and the third magnetic system is parallel to the conveyor belt between the active roller and the second driven roller, a second fixed column is installed inside the second driven roller, the second fixed column is fixedly connected to the first side plate, and the outer wall of the second fixed column is fixedly connected to multiple groups of fourth magnetic systems in sequence; the angle range of the fourth magnetic system covering the second fixed column is 180°.

[0010] Furthermore, the magnetism of the first magnetic system, the third magnetic system and the fourth magnetic system are all greater than that of the second magnetic system, and the magnetism of the second magnetic system gradually decreases from the end of the vibration plate close to the sleeve to the end far from the sleeve.

[0011] Furthermore, a buffer plate is installed between the vibration plate and the conveyor belt, the top of the buffer plate is fixedly connected to the vibration plate, and the bottom of the buffer plate is in contact with the conveyor belt. A spring plate is installed between the inclined plate and the vibration plate, the top of the spring plate is fixedly connected to the inclined plate, and the bottom of the spring plate is fixedly connected to the vibration plate. The spring plate is made of flexible material and deforms as the vibration plate vibrates, so that the gap between the vibration plate and the inclined plate is always sealed by the spring plate.

[0012] Furthermore, the driving assembly includes a driven gear, a rotating shaft, a driving gear, a driving bevel wheel, a worm, a driven bevel wheel, a parrot wheel, a worm wheel, an L-shaped rod, a second spring, a first driven wheel, a second driven wheel, a support platform, a motor, a driving wheel and a flexible coupling; the side of the rotating drum close to the second side plate is fixedly connected to the driven gear through a shaft, the side of the second side plate away from the first side plate is rotatably connected to the driving gear through a rotating shaft, the driving gear is meshed with the driven gear, the end of the rotating shaft away from the driving gear is fixedly connected to the driving bevel wheel, the side of the second side plate close to the driving gear is rotatably connected to the worm, the top of the worm is fixedly connected to the driven bevel wheel, the driving bevel wheel and the driven bevel wheel are meshed. The second side plate is meshingly connected, and the side close to the worm is rotatably connected to the parrot wheel. The parrot wheel is the part of the parrot gear without the teeth. One side of the parrot wheel is fixedly connected to the worm wheel through a shaft rod. The worm wheel is meshingly connected to the worm. An end of the first piston close to the parrot wheel is fixedly connected to an L-shaped rod. The L-shaped rod includes a horizontal section and a vertical section connected. The top of the vertical section of the L-shaped rod contacts the parrot wheel, and an end of the horizontal section of the L-shaped rod close to the vertical section is fixedly connected to a second spring; a through sliding groove is provided in the middle of the horizontal section of the L-shaped rod, and the L-shaped rod is slidably connected to the second side plate through the sliding groove, and the end of the horizontal section of the L-shaped rod away from the vertical section extends into the plug tube and is connected to the first piston;

[0013] One end of the second spring away from the L-shaped rod is fixedly connected to the second side plate, one end of the driving gear away from the second side plate is fixedly connected to the first driven wheel, the side of the driving roller close to the second side plate is fixedly connected to the second driven wheel through a shaft, the side of the second side plate away from the first side plate is fixedly connected to the support platform, the top of the support platform is fixedly connected to the motor, and the outer wall of the output end of the motor is fixedly connected to the driving wheel; the driving wheel, the first driven wheel and the second driven wheel are connected by belt transmission, the output end of the motor is fixedly connected to a flexible coupling through a flange, and one end of the flexible coupling is fixedly connected to one end of the connecting rod through a flange.

[0014] Furthermore, a reflux assembly is installed on the top of the magnetic separation zone, and the reflux assembly is used to clean the substances adhering to the outer wall of the drum and introduce these adhering substances into the purification zone for purification treatment.

[0015] Furthermore, the reflux component includes an inlet box, an inlet port, a scraper, an outlet box, an outlet port, a surge channel, a liquid storage tank and a pump body; the top of the shell is fixedly connected to the inlet box, the inlet port is opened on the side of the inlet box close to the rotating drum, the inlet box is fixedly connected to the scraper at the bottom of the inlet port, the top of the scraper contacts the outer wall of the rotating drum, the top of the first side plate is fixedly connected to the outlet box, the outlet box is located above the inclined plate, the outlet port is opened on the side of the outlet box close to the second side plate, the outlet box and the inlet box are connected through the surge channel, one side of the shell is provided with a liquid storage tank, the interior of the liquid storage tank stores stratified liquid, the top of the liquid storage tank is fixedly connected to the pump body, the output end of the pump body is connected to the top of the inlet box through a pipeline, and the input end of the pump body is connected to the liquid storage tank through a pipeline; the bottom of the inner wall of the inlet box is designed with an inclined surface, the bottom of the inner wall of the surge channel is designed with an inclined surface, and the horizontal height of the inlet box is higher than that of the outlet box.

[0016] Furthermore, an electric heating plate is installed inside the shell, and the electric heating plate is parallel to the conveyor belt between the first driven roller and the second driven roller; a storage box is plugged into the shell in the purification area, and the storage box is used to collect the heavy medium after drying. A handle is fixedly connected to the side of the storage box close to the first side panel, and a drain port is opened in the middle of the first side panel.

[0017] The beneficial effects of the present invention compared to the prior art are:

[0018] 1. High-precision impurity separation, significantly improving the purity of heavy media:

[0019] To address the problem of impurity entrapment in existing devices, this device adopts a multi-stage processing mechanism of "magnetic separation-dynamic vibration stratification-gradient magnetic field purification"; after the first magnetic system in the magnetic separation area completes the initial enrichment, the vibration plate in the purification area uses a double-piston hydraulic adjustment system to achieve alternating vibration in low and high amplitude modes; at low amplitude, only impurities and stratification liquid are vibrated and stratified; at high amplitude, the heavy medium releases the clamped impurities under the action of the gradient magnetic field of the second magnetic system, and the impurities are completely separated from the heavy medium in combination with the vibration amplitude of the vibration plate and the characteristic that the magnetism of the second magnetic system gradually decreases from one end to the other; subsequently, the strong magnetic fields of the third and fourth magnetic systems further adsorb the heavy medium and discharge residual impurities. Compared with traditional magnetic separators, the purity of the heavy medium is greatly improved, effectively ensuring the sorting effect and quality of coal washing.

[0020] 2. Efficiently recover drum adhesions to reduce resource waste:

[0021] Existing devices often cause loss of heavy medium due to improper handling of rotor drum adhesions, but the reflux component of this device can effectively solve this problem; when the rotor rotates, the scraper scrapes off the heavy medium particles adhering to its outer wall. Under the action of the pump body, the stratified liquid carries these particles through the inlet box, the surge channel and the outlet box and returns to the purification area for treatment; this design realizes the efficient recovery of heavy medium from the rotor drum adhesions, avoids the waste of heavy medium, reduces production costs and improves resource utilization.

[0022] 3. Full-process collaborative drive to significantly improve recycling efficiency:

[0023] The driving components of the device efficiently distribute the motor power to components such as the drum, vibration plate and conveyor belt through a precise transmission chain design; the main transmission chain drives the drum for magnetic separation and the conveyor belt for material transportation, and the vibration adjustment chain accurately controls the vibration amplitude of the vibration plate. All components work together to achieve continuous operation from solution magnetic separation and heavy medium purification to impurity separation and finished product collection; compared with the decentralized working mode of traditional equipment, this device has a more compact process, significantly improves the heavy medium recovery efficiency, and thus improves the overall efficiency of coal washing.

[0024] 4. Humanized structural design, easy to operate and maintain:

[0025] In terms of structural design, the device fully considers the actual use needs; for example, the storage box in the purification area is equipped with a handle to facilitate the quick replacement of the collected and dried heavy medium; the buffer plate between the vibration plate and the conveyor belt, and the spring plate between the inclined plate and the vibration plate, not only ensure the sealing of the equipment during operation and prevent material leakage, but also reduce interference between components; in addition, the inclined design of the inlet box and the chute, the slide guide structure of the L-shaped rod and other details all enhance the stability and reliability of the equipment operation, reduce the difficulty of operation, and facilitate daily maintenance and management by staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a heavy medium recovery device for coal washing provided by the present invention;

[0027] Figure 2 It is one of the cross-sectional structural diagrams of the shell;

[0028] Figure 3 Schematic diagram of the local cross-sectional structure of the sleeve;

[0029] Figure 4 Schematic diagram of the cross-sectional structure of the eccentric wheel;

[0030] Figure 5 Schematic diagram of the cross-sectional structure of the plug barrel;

[0031] Figure 6 It is the structural diagram of the active roller;

[0032] Figure 7 It is a structural schematic diagram of the back of the shell;

[0033] Figure 8 This is the second schematic diagram of the cross-sectional structure of the shell;

[0034] Figure 9 It is a structural diagram of a flexible coupling;

[0035] Figure 10 This is one of the cross-sectional structural diagrams of the drum;

[0036] Figure 11 This is the second schematic diagram of the cross-sectional structure of the drum;

[0037] Figure 12 It is a structural diagram of the outlet box;

[0038] Figure 13 Schematic diagram of the cross-sectional structure of the inlet box.

[0039] Numbers in the figure: 1. Shell; 2. Feed inlet; 3. Discharge outlet; 4. Partition; 5. Magnetic separation zone; 6. Purification zone; 7. Rotating drum; 8. First fixed column; 9. First magnetic system; 10. Guide plate; 11. First side plate; 12. Second side plate; 13. Bottom plate; 14. Inclined plate; 15. Vibrating plate; 16. Second magnetic system; 17. Sleeve; 18. Connecting rod; 19. Liquid guide groove; 20. Plug cylinder; 21. First piston; 22. Eccentric wheel; 23. Second piston; 24. Support plate; 25. First spring; 26. Active roller; 27. First driven roller; 28. Second driven roller; 29. ​​Conveyor belt; 30. Third magnetic system; 31. Second fixed column ;32. Fourth magnetic system;33. Inlet box;34. Inlet port;35. Scraper;36. Outlet box;37. Outlet port;38. Channel;39. Liquid storage tank;40. Pump body;41. Driven gear;42. Rotating shaft;43. Driving gear;44. Driving bevel gear;45. Worm;46. Driven bevel gear;47. Parrot gear;48. Worm gear;49. L-shaped rod;50. Second spring;51. First driven wheel;52. Second driven wheel;53. Support platform;54. Motor;55. Driving wheel;56. Flexible coupling;57. Buffer plate;58. Shrapnel;59. Storage box;60. Handle;61. Drain port;62. Electric heating plate. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0041] See also Figures 1 to 13 , this embodiment proposes a heavy medium recovery device for washing coal, the heavy medium recovery device for washing coal includes a shell 1, the two sides of the shell 1 are respectively a first side plate 11 and a second side plate 12, and the bottom of the shell 1 is a bottom plate 13; a feed port 2 is opened at the top of one end of the shell 1, and a discharge port 3 is opened on the first side plate 11 of the shell 1; a partition 4 is fixedly connected to the inside of the shell 1, and the partition 4 divides the interior of the shell 1 into a magnetic separation zone 5 and a purification zone 6, wherein the magnetic separation zone 5 is located on the side of the partition 4 close to the feed port 2, and the purification zone 6 is located on the side of the partition 4 away from the feed port 2; the top of the magnetic separation zone 5 is rotatably connected to a rotating drum 7, the partition 4 is located on one side of the rotating drum 7, and the top of the rotating drum 7 is higher than the partition 4; a first fixed column 8 is installed inside the rotating drum 7; the first fixed column 8 is fixedly connected to the first side plate 11, and the rotating drum 7 is rotatably connected to the second side plate 12.

[0042] Multiple sets of strongly magnetic first magnetic systems 9 are fixedly attached to the outer wall of the first fixed column 8. The first magnetic systems 9 cover a 120-degree angle on the first fixed column 8. The upper half of the first fixed column 8, adjacent to the purification zone 6, is not covered by the first magnetic system 9. When substances adsorbed on the outer wall of the rotating drum 7 pass through this area, the magnetic force disappears and the centrifugal force generated by the rotation of the rotating drum 7 ejects them toward the purification zone 6.

[0043] A guide plate 10 is fixedly connected to the interior of the magnetic separation zone 5. The guide plate 10 is an arc-shaped plate structure. One end of the guide plate 10 is connected to the feed port 2, and the other end of the guide plate 10 is connected to the discharge port 3. The main part of the guide plate 10 is located on the outside of the outer wall of the drum 7. The guide plate 10 guides the solid-liquid mixture to pass through the drum 7 for magnetic separation first, and then flow out from the discharge port 3; a purification component is installed inside the purification zone 6, and the purification component is used to process the material after magnetic separation to improve the purity of the heavy medium; a reflux component is installed on the top of the magnetic separation zone 5, and the reflux component is used to clean the materials adhered to the outer wall of the drum 7, and introduce these adhered materials into the purification zone 6 for purification treatment; a drive component is installed on the side of the shell 1 away from the discharge port 3, and the drive component provides power for the drum 7 and the purification component.

[0044] The solid-liquid mixture is a heavy medium suspension, composed of high-density medium particles (such as magnetite powder or ferrosilicon powder) mixed with water. It is used for heavy medium separation (DMS). The heavy medium suspension contains a small amount of ore fines or impurities, which must be processed and recovered in a heavy medium recovery unit.

[0045] After the solid-liquid mixture to be processed is poured into the feed port 2 at the top of one end of the shell 1, it enters the magnetic separation zone 5 inside the shell 1. Under the action of the first magnetic system 9, the heavy medium in the solution is adsorbed on the outer wall of the drum 7, and the remaining part flows out through the discharge port 3. Within the magnetic separation zone 5, the guide plate 10 guides the flow path of the solid-liquid mixture, allowing it to fully contact the outer wall of the drum 7. When the solid-liquid mixture contacts the drum 7, the strong magnetic first magnetic system 9 inside the drum 7 will exert a strong attraction on the heavy medium, causing it to be quickly adsorbed on the outer wall of the drum 7. The remaining liquid, guided by the guide plate 10, flows smoothly out of the discharge port 3.

[0046] As the drum 7 rotates, the heavy medium adsorbed on its outer wall is brought to the top of the partition 4; at this time, the heavy medium just leaves the magnetic range of the first magnetic system 9; due to the centrifugal force generated by the rotation of the drum 7, the heavy medium is thrown forward and falls into the purification area 6 on the other side of the partition 4, preparing for subsequent further purification; at the same time, a part of the magnetically separated mixture will remain on the outer wall of the drum 7, and these mixtures still contain heavy medium particles, which will enter the reflux component as the drum 7 rotates, and then enter the purification area 6 through the reflux component to be processed; and during the whole process, the drive component provides power for the drum 7 and subsequent purification components to ensure that each component can work in a coordinated and orderly manner.

[0047] The purification assembly includes: an inclined plate 14, a vibrating plate 15, a second magnetic system 16, a sleeve 17, a connecting rod 18, a liquid guide groove 19, a plug cylinder 20, a first piston 21, an eccentric wheel 22, a second piston 23, a support plate 24, a first spring 25, an active roller 26, a first driven roller 27, a second driven roller 28, a conveyor belt 29, a third magnetic system 30, a second fixed column 31 and a fourth magnetic system 32; the top of the partition 4 is fixedly connected to the inclined plate 14, and the heavy medium falls from the top of the partition 4 to the inclined plate 14. The vibrating plate 15 is installed below the inclined plate 14, and the bottom of the vibrating plate 15 is fixedly connected to the second magnetic system 16. One end of the vibrating plate 15 is rotatably connected to the first side plate 11 and the second side plate 12 of the shell 1, and the other end of the vibrating plate 15 is fixed. It is connected to a sleeve 17, and a connecting rod 18 is rotatably connected to the middle part of the inner wall of the sleeve 17. Liquid guide grooves 19 are provided between the two ends of the inner wall of the sleeve 17 and the connecting rod 18. The interior of the shell 1 is located on one side of the sleeve 17 and is fixedly connected to a plug cylinder 20. A first piston 21 is slidably connected to the inside of the plug cylinder 20. The two ends of the liquid guide grooves 19 close to the rotating cylinder 7 are connected to the plug cylinder 20 through a pipe. Both ends of the connecting rod 18 are fixedly connected to an eccentric wheel 22, and the sides of the two eccentric wheels 22 close to each other are rotatably connected to the two ends of the sleeve 17 respectively. The eccentric wheel 22 is hollow in design, and the interior of the eccentric wheel 22 is connected to the liquid guide groove 19. A second piston 23 is provided in the eccentric wheel 22, and the second piston 23 is slidably connected to the outer wall of the connecting rod 18. The plug cylinder 20 is filled with hydraulic oil. The hydraulic oil is pressed into the hollow eccentric wheel 22 or extracted from the eccentric wheel 22 by the action of the first piston 21, which can drive the second piston 23 to slide on the outer wall of the connecting rod 18.

[0048] A support plate 24 is fixedly connected to the interior of the shell 1, and a plurality of groups of first springs 25 are fixedly connected to the top of the support plate 24 at equal intervals. The top of the first spring 25 is fixedly connected to the bottom of the sleeve 17. The interior of the purification zone 6 is located below the vibration plate 15 and is rotatably connected to an active roller 26. The interior of the purification zone 6 is rotatably connected to a first driven roller 27 and a second driven roller 28. The first driven roller 27 is located on one side of the active roller 26 in the horizontal direction, and the second driven roller 28 is located above the area between the active roller 26 and the first driven roller 27. A conveyor belt 29 is provided on the outer walls of the active roller 26, the first driven roller 27 and the second driven roller 28. A third magnetic system 30 is provided between the second driven roller 28 and the active roller 26. The two sides of the third magnetic system 30 are fixedly connected to the first side plate 11 and the second side plate 12 respectively. The third magnetic system 30 is parallel to the conveyor belt 29 between the active roller 26 and the second driven roller 28. A second fixed column 31 is installed inside the second driven roller 28. The second fixed column 31 is fixedly connected to the first side plate 11. The outer wall of the second fixed column 31 is fixedly connected to multiple groups of fourth magnetic systems 32 in sequence; the fourth magnetic system 32 covers the second fixed column 31 in an angular range of 180°. The first magnetic system 9, the third magnetic system 30 and the fourth magnetic system 32 are all strong magnetic systems, the second magnetic system 16 is a weak magnetic system, and the magnetism of the second magnetic system 16 gradually decreases from the end of the vibration plate 15 close to the sleeve 17 to the end away from the sleeve 17; only when the eccentric wheel 22 is filled with hydraulic oil for more than three-quarters of the space, the vibration generated by the vibration plate 15 can vibrate the heavy medium attracted by the second magnetic system 16.

[0049] A buffer plate 57 is installed between the vibration plate 15 and the conveyor belt 29. The top of the buffer plate 57 is fixedly connected to the vibration plate 15, and the bottom of the buffer plate 57 contacts the conveyor belt 29. A spring piece 58 is installed between the inclined plate 14 and the vibration plate 15. The top of the spring piece 58 is fixedly connected to the inclined plate 14, and the bottom of the spring piece 58 is fixedly connected to the vibration plate 15. The spring piece 58 is made of flexible material and will deform as the vibration plate 15 vibrates, ensuring that the gap between the vibration plate 15 and the inclined plate 14 is always sealed by the spring piece 58.

[0050] An electric heating plate 62 is installed inside the housing 1 and is parallel to the conveyor belt 29 between the first driven roller 27 and the second driven roller 28. A storage box 59 is inserted into the purification zone 6 of the housing 1. The storage box 59 is used to collect the dried heavy medium. A handle 60 is fixedly connected to the side of the storage box 59 near the first side panel 11. A drain port 61 is provided in the middle of the first side panel 11 for discharging the stratified liquid carrying other impurities.

[0051] The driving assembly includes: a driven gear 41, a rotating shaft 42, a driving gear 43, a driving bevel gear 44, a worm 45, a driven bevel gear 46, a parrot wheel 47, a worm wheel 48, an L-shaped rod 49, a second spring 50, a first driven wheel 51, a second driven wheel 52, a support platform 53, a motor 54, a driving wheel 55 and a flexible coupling 56; the side of the rotating drum 7 close to the second side plate 12 is fixedly connected to the driven gear 41 through a shaft, and the side of the second side plate 12 away from the first side plate 11 is rotatably connected to the driving gear 43 through the rotating shaft 42, the driving gear 43 is meshed with the driven gear 41, the end of the rotating shaft 42 away from the driving gear 43 is fixedly connected to the driving bevel gear 44, the side of the second side plate 12 close to the driving gear 43 is rotatably connected to the worm 45, the top of the worm 45 is fixedly connected to the driven bevel gear 46, and the driving bevel gear 44 is meshed with the driven bevel gear 46 Next, the second side plate 12 is rotatably connected to the side of the worm 45 with a parrot wheel 47. The structure of the parrot wheel 47 is the existing parrot gear without the tooth part (the tooth profile of the parrot gear is a non-circular logarithmic spiral structure). One side of the parrot wheel 47 is fixedly connected to a worm wheel 48 through a shaft rod. The worm wheel 48 is meshed with the worm 45. The first piston 21 is fixedly connected to an L-shaped rod 49 at one end near the parrot wheel 47. The L-shaped rod 49 includes a horizontal section and a vertical section connected. The top of the vertical section of the L-shaped rod 49 contacts the parrot wheel 47. The horizontal section of the L-shaped rod 49 is fixedly connected to an end of the vertical section near the second spring 50. A through sliding groove is provided in the middle of the horizontal section of the L-shaped rod 49. The L-shaped rod 49 is slidably connected to the second side plate 12 through the sliding groove. The end of the horizontal section of the L-shaped rod 49 away from the vertical section extends into the plug tube 20 and is connected to the first piston 21.

[0052] The end of the second spring 50 away from the L-shaped rod 49 is fixedly connected to the second side plate 12, the end of the driving gear 43 away from the second side plate 12 is fixedly connected to the first driven wheel 51, the side of the active roller 26 close to the second side plate 12 is fixedly connected to the second driven wheel 52 through a shaft, the side of the second side plate 12 away from the first side plate 11 is fixedly connected to a support platform 53, the top of the support platform 53 is fixedly connected to the motor 54, and the outer wall of the output end of the motor 54 is fixedly connected to the driving wheel 55; the driving wheel 55, the first driven wheel 51 and the second driven wheel 52 are connected by belt drive, the output end of the motor 54 is fixedly connected to the flexible coupling 56 through a flange, and one end of the flexible coupling 56 is fixedly connected to one end of the connecting rod 18 through a flange.

[0053] The motor 54 serves as the power source of the entire device and is connected to the connecting rod 18 through a flexible coupling 56; when the connecting rod 18 vibrates, the flexible coupling 56 can compensate for the error between the motor 54 and the connecting rod 18, while also playing a role in buffering and shock absorption to ensure smooth power transmission.

[0054] The power at the output end of the motor 54 is mainly transmitted through two transmission chains:

[0055] Main transmission chain: The driving wheel 55 is connected to the first driven wheel 51 and the second driven wheel 52 via a belt; the first driven wheel 51 is fixedly connected to the driving gear 43 through a shaft, and the driving gear 43 engages with the driven gear 41 to drive the rotating drum 7 to rotate and complete the magnetic separation work; the second driven wheel 52 is connected to the active roller 26 through a shaft, driving the active roller 26 to rotate, and the active roller 26 then drives the first driven roller 27 and the second driven roller 28 to rotate synchronously through the conveyor belt 29 to realize the transmission of materials.

[0056] Vibration adjustment chain: During the rotation of the driving gear 43, the driving bevel gear 44 is driven to rotate through the rotating shaft 42; the driving bevel gear 44 is meshed with the driven bevel gear 46 to transmit power to the worm 45; the worm 45 is meshed with the worm wheel 48 to drive the parrot wheel 47 to rotate; the cam structure of the parrot wheel 47 pushes the L-shaped rod 49 during rotation, and a through slide groove is provided in the middle of the horizontal section of the L-shaped rod 49, which is slidably connected to the second side plate 12 to ensure stable movement of the L-shaped rod 49; the L-shaped rod 49 drives the first piston 21 to reciprocate in the plug tube 20, and the second spring 50 cooperates with the slide groove to accurately reset the first piston 21 and prevent the L-shaped rod 49 from rotating, so that the L-shaped rod 49 does not contact the parrot wheel 47, thereby ensuring the periodic adjustment of the amplitude of the vibration plate 15.

[0057] The heavy medium mixture after magnetic separation slides along the inclined plate 14 to the vibrating plate 15; the vibrating plate 15 adopts a unique double-piston hydraulic adjustment system to achieve flexible control of the vibration amplitude:

[0058] Low amplitude mode: When the parrot wheel 47 rotates, its cam structure pushes the L-shaped rod 49, causing the first piston 21 to move toward the outside of the plug barrel 20; since the plug barrel 20, the liquid guide groove 19 and the eccentric wheel 22 are filled with hydraulic oil, the movement of the first piston 21 pulls the second piston 23 through the hydraulic transmission, and the liquid in the eccentric wheel 22 is drawn into the plug barrel 20; the mass of the eccentric wheel 22 is reduced, and the centrifugal force generated during its rotation is reduced, thereby driving the vibration plate 15 to generate micro-vibration; at this time, the magnetic force generated by the second magnetic system 16 is sufficient to bind the heavy medium, and the only impurities and stratified liquid are lifted up under the action of vibration, causing the impurities with lower density to gradually rise to the upper layer of the stratified liquid, and the heavy medium is adsorbed.

[0059] High amplitude mode: As the parrot wheel 47 continues to rotate, when the cam structure no longer pushes the L-shaped rod 49, under the tension of the second spring 50, the L-shaped rod 49 drives the first piston 21 to move toward the inside of the plug tube 20; the first piston 21 pushes the second piston 23 through the hydraulic pressure, injecting the hydraulic oil in the plug tube 20 into the eccentric wheel 22, the mass of the eccentric wheel 22 increases, and the centrifugal force generated during rotation increases, so that the amplitude of the vibration plate 15 increases; under severe vibration, although the heavy medium is constrained by the second magnetic system 16, the impact force generated by the vibration causes it to release the clamped impurities; due to the difference in amplitude between the heavy medium and the impurities, combined with the gradient magnetic field of the second magnetic system 16, the impurities and the heavy medium are completely separated.

[0060] Buffer sheet 57 plays a key role in transferring the separated material to conveyor belt 29. Made of a flexible and elastic material, buffer sheet 57 is installed between the vibration plate 15 and conveyor belt 29. Through its own elastic deformation, buffer sheet 57 can tightly fit the gap between the vibration plate 15 and conveyor belt 29. When the vibration plate 15 vibrates, buffer sheet 57 deforms accordingly with the movement of the vibration plate 15, maintaining a sealed state in the gap, preventing the stratified liquid from leaking through the gap and ensuring that the stratified liquid can be smoothly collected at the junction of the vibration plate 15 and conveyor belt 29. When the stratified liquid reaches a certain depth, impurities carried on its top are discharged through drain port 61.

[0061] The material then enters the upward-sloping conveyor belt 29. The third magnetic system 30, mounted between the active roller 26 and the second driven roller 28, is parallel to the conveyor belt 29 and generates a strong magnetic attraction force. Under the influence of the magnetic force, the heavy medium overcomes gravity and the downward force caused by the inclination of the conveyor belt 29, moving upward along the conveyor belt 29. The stratified liquid, carrying impurities, is discharged from the drain port 61 in the middle of the first side plate 11 under the influence of gravity. When the heavy medium reaches the fourth magnetic system 32, its strong magnetic force maintains its adsorption until it is transported to the drying area of ​​the electric heating plate 62. The dried heavy medium, under the combined influence of gravity at the end of the conveyor belt 29, precisely falls into the storage box 59.

[0062] The reflux assembly includes an inlet box 33, an inlet port 34, a scraper 35, an outlet box 36, an outlet port 37, a gushing channel 38, a liquid storage tank 39 and a pump body 40; the top of the housing 1 is fixedly connected to the inlet box 33, and the inlet port 34 is opened on the side of the inlet box 33 close to the drum 7. The inlet box 33 is fixedly connected to the scraper 35 at the bottom of the inlet port 34, and the top of the scraper 35 contacts the outer wall of the drum 7. The top of the first side plate 11 is fixedly connected to the outlet box 36, and the outlet box 36 is located above the inclined plate 14. The outlet box 36 is opened on the side close to the second side plate 12. The outlet box 36 is connected to the inlet box 33 through the gush channel 38. A liquid storage tank 39 is provided on one side of the shell 1. The stratified liquid is stored in the liquid storage tank 39. The top of the liquid storage tank 39 is fixedly connected to the pump body 40. The output end of the pump body 40 is connected to the top of the inlet box 33 through a pipe, and the input end of the pump body 40 is connected to the liquid storage tank 39 through a pipe; the bottom of the inner wall of the inlet box 33 is designed with a slope, and the bottom of the inner wall of the gush channel 38 is designed with a slope. The horizontal height of the inlet box 33 is higher than the outflow box 36. This design allows the liquid in the inflow box 33 to flow from the outflow box 36 to the inclined plate 14 along the slope.

[0063] When the heavy medium mixture after magnetic separation slides down the inclined plate 14 to the vibration plate 15 , the heavy medium mixture can be evenly spread on the vibration plate 15 by infiltration of the stratification liquid.

[0064] The impurities in the heavy medium after magnetic separation are mainly quartz, feldspar, clay minerals, and coal powder particles. The density of these substances is 1.2g / cm 3 Up to 3.0g / cm 3 The existing commonly used heavy media are often magnetite powder, ferrosilicon alloy powder, barite, and the density of the layering liquid used in the present invention is 3.0g / cm 3 Up to 4.0g / cm 3 .

[0065] During the rotation of the drum 7, some of the magnetically separated materials will inevitably adhere to its outer wall; as the drum 7 rotates, these materials will be scraped off by the scraper 35; the scraper 35 is fixed to the bottom of the inlet 34 of the inlet box 33, and its top is in close contact with the outer wall of the drum 7, which can effectively scrape off the materials adhering to the outer wall of the drum 7.

[0066] The scraped material enters the inlet box 33 from the inlet port 34, at which time the pump body 40 starts working; a liquid storage tank 39 is provided on one side of the shell 1, which stores stratified liquid inside; the output end of the pump body 40 is connected to the top of the inlet box 33 through a pipe, and the input end is connected to the liquid storage tank 39 through a pipe; under the action of the pump body 40, the stratified liquid in the liquid storage tank 39 is pumped into the inlet box 33; the bottom of the inner wall of the inlet box 33 is designed with a slope, and the bottom of the inner wall of the conduit 38 is also designed with a slope, and the horizontal height of the inlet box 33 is higher than the outlet box 36; such a design allows the stratified liquid to carry the material scraped and entering the inlet box 33, flow smoothly into the outlet box 36 along the inlet box 33 and the conduit 38, and finally flow out from the outlet 37, fall on the inclined plate 14, and thus return to the purification area 6 to participate in the subsequent purification process.

[0067] The working principle of the heavy medium recovery device for coal washing proposed in this embodiment is as follows:

[0068] When the solid-liquid mixture to be treated is poured into the feed port 2 at the top of one end of the shell 1, it enters the magnetic separation zone 5 inside the shell 1. Under the action of the first magnetic system 9, the heavy medium in the solid-liquid mixture is adsorbed on the outer wall of the drum 7, and the remaining part flows out through the discharge port 3. As the drum 7 rotates, the heavy medium adsorbed on its outer wall is brought above the partition 4; at this time, the heavy medium has just left the magnetic range of the first magnetic system 9. Due to the centrifugal force generated by the rotation of the drum 7, the heavy medium is thrown forward and falls onto the inclined plate 14 in the purification zone 6 on the other side of the partition 4. The heavy medium slides along the inclined plate 14 and falls onto the vibrating plate 15.

[0069] During the rotation of the drum 7, some of the magnetically separated materials will inevitably adhere to its outer wall, and these materials often contain heavy media; as the drum 7 rotates, these materials will be scraped off by the scraper 35; the scraper 35 is fixed to the bottom of the inlet 28 of the inlet box 27, and its top is in close contact with the outer wall of the drum 7, which can effectively scrape off the adhered materials, and the scraped materials enter the inlet box 33 from the inlet 34. At this time, the pump body 40 starts to work and the stratified liquid in the liquid storage tank 39 is pumped into the inlet box 33; the stratified liquid carries the materials in the inlet box 33, flows into the outlet box 36, and finally flows out from the outlet 37 and falls on the inclined plate 14. The stratified liquid flushes the inclined plate 14 and carries the heavy media adhered to the inclined plate 14 to flow to the top of the vibration plate 15, so that the stratified liquid accumulates on the vibration plate 15.

[0070] With the cooperation of the stratified liquid and with the frequency-modulated vibration of the vibration plate 15, the heavy medium and impurities form upper and lower layers in the stratified liquid. The upper stratified liquid carries impurities and overflows from the drain port 61, and the lower heavy medium is adsorbed onto the conveyor belt 29 by the third magnetic system 30. During this adsorption process, since the heavy medium is located below the stratified liquid, the heavy medium will not carry impurities when being attracted by the third magnetic system 30, and the impurities will not be sandwiched between the heavy medium and the conveyor belt 29. As the conveyor belt 29 moves, when the heavy medium reaches the position of the second driven roller 28, the heavy medium moves to the area between the second driven roller 28 and the first driven roller 27 along the conveyor belt 29 under the attraction of the fourth magnetic system 32. After being dried by the electric heating plate 62, the heavy medium will not adhere to the surface of the conveyor belt 29, and the heavy medium falls into the storage box 59 under its own gravity and the help of the conveyor belt 29.

[0071] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be considered that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims

1. A heavy medium recovery device for washing coal, comprising a shell (1), wherein both sides of the shell (1) are respectively a first side plate (11) and a second side plate (12), and the bottom of the shell (1) is a bottom plate (13); a feed port (2) is provided at the top of one end of the shell (1), and a discharge port (3) is provided on the first side plate (11) of the shell (1); and the device is characterized in that: The shell (1) is fixedly connected to a partition (4), which divides the interior of the shell (1) into a magnetic separation zone (5) and a purification zone (6), wherein the magnetic separation zone (5) is located on a side of the partition (4) close to the feed inlet (2), and the purification zone (6) is located on a side of the partition (4) away from the feed inlet (2); the top of the magnetic separation zone (5) is rotatably connected to a rotating drum (7), the partition (4) is located on one side of the rotating drum (7), and the top of the rotating drum (7) is higher than the partition (4); a first fixed column (8) is installed inside the rotating drum (7); the first fixed column (8) and the first side plate ( 11) is fixedly connected, and the drum (7) is rotatably connected to the second side plate (12); the outer wall of the first fixed column (8) is fixedly connected with multiple groups of first magnetic systems (9) with strong magnetism in sequence, and the upper half of the first fixed column (8) and the side adjacent to the purification area (6) are not covered by the first magnetic system (9); a purification component is installed inside the purification area (6), and the purification component is used to process the material after magnetic separation and further recover the heavy medium; a drive component is installed on the side of the shell (1) away from the discharge port (3), and the drive component provides power for the drum (7) and the purification component; The purification assembly comprises an inclined plate (14), a vibration plate (15), a second magnetic system (16), a sleeve (17), a connecting rod (18), a liquid guide groove (19), a plug sleeve (20), a first piston (21), an eccentric wheel (22), and a second piston (23); the top of the partition (4) is fixedly connected to the inclined plate (14), and the magnetically separated material falls from the top of the partition (4) onto the inclined plate (14); a vibration plate (15) is installed below the inclined plate (14), and the bottom of the vibration plate (15) is fixedly connected to the second magnetic system (16); one end of the vibration plate (15) is rotatably connected to the first side plate (11) and the second side plate (12) of the shell (1); the other end of the vibration plate (15) is fixedly connected to the sleeve (17), and the middle part of the inner wall of the sleeve (17) is rotatably connected to the connecting rod (18). A liquid guide groove (19) is provided between the two ends of the inner wall of the sleeve (17) and the connecting rod (18). A plug cylinder (20) is fixedly connected to one side of the sleeve (17) inside the housing (1). A first piston (21) is slidably connected inside the plug cylinder (20). The two ends of the liquid guide grooves (19) close to the rotating cylinder (7) are communicated with the plug cylinder (20) through a pipeline. Both ends of the connecting rod (18) are fixedly connected to an eccentric wheel (22). The sides of the two eccentric wheels (22) close to each other are rotatably connected to the two ends of the sleeve (17). The interior of the eccentric wheel (22) is a hollow structure. The interior of the eccentric wheel (22) is communicated with the liquid guide groove (19). A second piston (23) is provided in the eccentric wheel (22). The second piston (23) is slidably connected to the outer wall of the connecting rod (18).

2. A heavy medium recovery device for coal washing according to claim 1, characterized in that: A guide plate (10) is fixedly connected to the interior of the magnetic separation zone (5). The guide plate (10) is an arc-shaped plate structure. One end of the guide plate (10) is connected to the feed port (2), and the other end of the guide plate (10) is connected to the discharge port (3). The main body of the guide plate (10) is located outside the outer wall of the drum (7).

3. A heavy medium recovery device for coal washing according to claim 1, characterized in that: The purification component further comprises a support plate (24), a first spring (25), an active roller (26), a first driven roller (27), a second driven roller (28), a conveyor belt (29), a third magnetic system (30), a second fixed column (31) and a fourth magnetic system (32); the interior of the shell (1) is fixedly connected to the support plate (24), the top of the support plate (24) is fixedly connected to multiple groups of first springs (25) at equal intervals, the top of the first spring (25) is fixedly connected to the bottom of the sleeve (17), the interior of the purification zone (6) is located below the vibration plate (15) and is rotatably connected to the active roller (26), the interior of the purification zone (6) is rotatably connected to the first driven roller (27) and the second driven roller (28), the first driven roller (27) is located on one side of the active roller (26) in the horizontal direction, and the second driven roller (28) is located between the active roller ( 26) and the first driven roller (27), the outer walls of the active roller (26), the first driven roller (27) and the second driven roller (28) are provided with a conveyor belt (29), and a third magnetic system (30) is provided between the second driven roller (28) and the active roller (26), and the two sides of the third magnetic system (30) are fixedly connected to the first side plate (11) and the second side plate (12) respectively. The third magnetic system (30) is parallel to the conveyor belt (29) between the active roller (26) and the second driven roller (28), and a second fixed column (31) is installed inside the second driven roller (28), and the second fixed column (31) is fixedly connected to the first side plate (11). The outer wall of the second fixed column (31) is fixedly connected with multiple groups of fourth magnetic systems (32) in sequence; the angle range of the fourth magnetic system (32) covering the second fixed column (31) is 180 degrees.

4. A heavy medium recovery device for coal washing according to claim 3, characterized in that: The magnetism of the first magnetic system (9), the third magnetic system (30) and the fourth magnetic system (32) is greater than the magnetism of the second magnetic system (16), and the magnetism of the second magnetic system (16) gradually decreases from the end of the vibration plate (15) close to the sleeve (17) to the end away from the sleeve (17).

5. A heavy medium recovery device for coal washing according to claim 3, characterized in that: A buffer sheet (57) is installed between the vibration plate (15) and the conveyor belt (29), the top of the buffer sheet (57) is fixedly connected to the vibration plate (15), and the bottom of the buffer sheet (57) is in contact with the conveyor belt (29). A spring sheet (58) is installed between the inclined plate (14) and the vibration plate (15), the top of the spring sheet (58) is fixedly connected to the inclined plate (14), and the bottom of the spring sheet (58) is fixedly connected to the vibration plate (15). The spring sheet (58) is a flexible material. The spring sheet (58) is deformed as the vibration plate (15) vibrates, so that the gap between the vibration plate (15) and the inclined plate (14) is always sealed by the spring sheet (58).

6. A heavy medium recovery device for coal washing according to claim 3, characterized in that: The driving assembly includes a driven gear (41), a rotating shaft (42), a driving gear (43), a driving bevel gear (44), a worm (45), a driven bevel gear (46), a parrot gear (47), a worm gear (48), an L-shaped rod (49), a second spring (50), a first driven wheel (51), a second driven wheel (52), a support platform (53), a motor (54), a driving wheel (55) and a flexible coupling (56); the rotating drum (7) is connected to the second side plate (12) by a shaft The rod is fixedly connected to a driven gear (41), and the side of the second side plate (12) away from the first side plate (11) is rotatably connected to a driving gear (43) through a rotating shaft (42). The driving gear (43) is meshed with the driven gear (41). The end of the rotating shaft (42) away from the driving gear (43) is fixedly connected to a driving bevel gear (44). The side of the second side plate (12) close to the driving gear (43) is rotatably connected to a worm (45). The top of the worm (45) is fixedly connected to the driven bevel gear (44). Wheel (46), the active cone wheel (44) is meshed with the driven cone wheel (46), the second side plate (12) is connected to the side of the worm (45) by rotation with the parrot wheel (47), the parrot wheel (47) is a part of the parrot gear without the teeth, one side of the parrot wheel (47) is fixedly connected to the worm wheel (48) through the shaft, the worm wheel (48) is meshed with the worm (45), the first piston (21) is fixedly connected to the end of the parrot wheel (47) by the L-shaped rod (49), the L-shaped rod (4 9) comprising a horizontal section and a vertical section connected to each other, the top end of the vertical section of the L-shaped rod (49) contacts the parrot wheel (47), and the horizontal section of the L-shaped rod (49) is fixedly connected to the second spring (50) at one end close to the vertical section; a through-slot is provided in the middle of the horizontal section of the L-shaped rod (49), and the L-shaped rod (49) is slidably connected to the second side plate (12) through the slot, and the horizontal section of the L-shaped rod (49) is extended into the plug tube (20) and connected to the first piston (21) at one end away from the vertical section; One end of the second spring (50) away from the L-shaped rod (49) is fixedly connected to the second side plate (12); one end of the driving gear (43) away from the second side plate (12) is fixedly connected to the first driven wheel (51); the side of the driving roller (26) close to the second side plate (12) is fixedly connected to the second driven wheel (52) through a shaft; the side of the second side plate (12) away from the first side plate (11) is fixedly connected to the support platform (53); the top of the support platform (53) is fixedly connected to the motor (54); the outer wall of the output end of the motor (54) is fixedly connected to the driving wheel (55); the driving wheel (55), the first driven wheel (51) and the second driven wheel (52) are connected through a belt drive; the output end of the motor (54) is fixedly connected to the flexible coupling (56) through a flange; one end of the flexible coupling (56) is fixedly connected to one end of the connecting rod (18) through a flange.

7. A heavy medium recovery device for coal washing according to claim 1, characterized in that: A reflux assembly is installed on the top of the magnetic separation zone (5), and the reflux assembly is used to clean the substances adhering to the outer wall of the drum (7) and introduce these adhering substances into the purification zone (6) for purification treatment.

8. A heavy medium recovery device for coal washing according to claim 7, characterized in that: The reflux assembly comprises an inlet box (33), an inlet port (34), a scraper (35), an outlet box (36), an outlet port (37), a gushing channel (38), a liquid storage box (39) and a pump body (40); the top of the housing (1) is fixedly connected to the inlet box (33), the inlet port (34) is provided on a side of the inlet box (33) close to the drum (7), the inlet box (33) is fixedly connected to the scraper (35) at the bottom of the inlet port (34), the top of the scraper (35) contacts the outer wall of the drum (7), the top of the first side plate (11) is fixedly connected to the outlet box (36), the outlet box (36) is located above the inclined plate (14), and the outlet box (36) An outlet (37) is provided on one side close to the second side plate (12), and the outlet box (36) is connected to the inlet box (33) through a gushing channel (38). A liquid storage box (39) is provided on one side of the shell (1), and a stratified liquid is stored in the liquid storage box (39). A pump body (40) is fixedly connected to the top of the liquid storage box (39), and the output end of the pump body (40) is connected to the top of the inlet box (33) through a pipeline, and the input end of the pump body (40) is connected to the liquid storage box (39) through a pipeline; the bottom of the inner wall of the inlet box (33) is designed to be inclined, and the bottom of the inner wall of the gushing channel (38) is designed to be inclined, and the horizontal height of the inlet box (33) is higher than that of the outlet box (36).

9. A heavy medium recovery device for coal washing according to claim 3, characterized in that: An electric heating plate (62) is installed inside the shell (1), and the electric heating plate (62) is parallel to the conveyor belt (29) between the first driven roller (27) and the second driven roller (28); the shell (1) is connected to a storage box (59) in the purification area (6), and the storage box (59) is used to collect the heavy medium after drying. A handle (60) is fixedly connected to the side of the storage box (59) close to the first side plate (11), and a drainage port (61) is opened in the middle of the first side plate (11).

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