Dry drum magnetic separator

Abstract

The invention discloses a dry drum type magnetic separator, relates to the technical field of mining equipment, and is characterized in that on the basis of a two-section and one-closed-loop fine crushing process, one-coarse and one-fine dry type magnetic separation is carried out on an iron ore raw material, so that the iron grade of final concentrate can be effectively improved; a plurality of mutually sleeved rotary drums are rotatably mounted between the inner end wall of a cylinder and an arc permanent magnet, and magnetic isolation plates are arranged on the rotary drums, so that the device can be used for adjusting the number of the magnetic isolation plates blocked between the inner end wall of the cylinder and the arc permanent magnet; the magnetic attraction strength of the arc-shaped permanent magnet acting on the cylindrical surface of the cylinder is flexibly controlled, the universality of a single dry-type drum magnetic separator can be effectively improved, in rough and fine multi-working-condition magnetic separation operation, multiple dry-type drum magnetic separators with different magnetic attraction strengths do not need to be customized in a targeted mode, the implementation convenience of the magnetic separation process is effectively improved, and the magnetic separation efficiency is improved. And therefore, the production cost is reduced, and the production efficiency is improved to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, and in particular to a dry drum magnetic separator. Background Technology

[0002] In iron ore mining and processing, dry drum magnetic separators are the core equipment for mineral separation and are widely used in multi-stage combined screening processes such as roughing and cleaning. Currently, the mainstream dry drum magnetic separators used for iron ore magnetic separation mostly adopt permanent magnet structures, which have advantages such as stable magnetic field, no need for external power supply, and low energy consumption.

[0003] In existing technologies, the magnetic field strength of permanent magnets is fixed by their material, specifications, and arrangement. This means that the magnetic force of magnetic separators using permanent magnet structures cannot be dynamically adjusted according to actual sorting needs after the equipment leaves the factory. In actual iron ore processing, the roughing stage requires a strong magnetic field to efficiently adsorb a large number of magnetic minerals and reduce missed selection, while the cleaning stage requires a weaker magnetic field to remove gangue and other impurities and improve the concentrate grade. Since the magnetic force of permanent magnet magnetic separators is not adjustable, companies need to configure dedicated equipment for different sorting stages. This not only increases equipment purchase and floor space costs but also requires frequent adjustments to the production line layout to switch between roughing and cleaning processes. As a result, the equipment has poor flexibility and is difficult to adapt to the needs of continuous production under multiple operating conditions, thus affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the magnetic attraction intensity of permanent magnet magnetic separators is difficult to adjust flexibly during actual use, and to propose a dry drum magnetic separator.

[0005] To address the problems existing in the prior art, the present invention adopts the following technical solution: A dry drum magnetic separator includes a frame, a cylinder rotatably mounted within the frame, a first trough fixedly mounted at the bottom of the frame, a second trough fixedly mounted within the frame and located on the front of the cylinder, a first servo motor for driving the cylinder's rotation fixedly mounted on the frame, a shaft passing through the central axis of the cylinder mounted within the frame, and a sector-shaped frame fixedly mounted on the shaft within the cylinder, wherein an arc-shaped permanent magnet facing the second trough is fixedly mounted on the sector-shaped frame, and a magnetic isolation mechanism is provided between the cylinder and the arc-shaped permanent magnet, the magnetic isolation mechanism including... Multiple interlocking rotating drums are arranged coaxially. A first shaft is fixedly installed at the center of the left end of each rotating drum, and the multiple first shafts are interlocked. A second shaft is fixedly installed at the center of the right end of each rotating drum. A magnetic shielding plate is provided on the cylindrical surface of the rotating drum, and the non-magnetic shielding plate area on the cylindrical surface of the rotating drum is set as a non-magnetic plate. A drive mechanism for driving the rotation of the multiple rotating drums is installed on the frame. A guide plate is installed in the frame between the first and second tanks, and the end of the guide plate near the second tank is set as a downward inclined structure.

[0006] Preferably, the shaft is rotatably connected to the frame, a first lever is fixedly installed at the end of the shaft, and a hydraulic telescopic rod is hinged between the end of the first lever and the frame.

[0007] Preferably, the thickness of the magnetic shielding plates on the multiple rotating drums decreases layer by layer from the inside to the outside.

[0008] Preferably, the walls of two adjacent rotating cylinders slide against each other, with the wall of the outermost rotating cylinder sliding against the inner end wall of the cylinder, and the wall of the innermost rotating cylinder sliding against the arc-shaped permanent magnet.

[0009] Preferably, the drive mechanism includes a first gear fixedly installed at the end of the first shaft cylinder, a plurality of coaxially arranged first spline cylinders rotatably mounted on the frame, a second gear fixedly installed on each first spline cylinder, the plurality of second gears corresponding to the plurality of first gears and meshing with each other, a second spline cylinder coaxially arranged with the first spline cylinder fixedly mounted on the frame, and a spline shaft slidably inserted into the second spline cylinder, the outer dimensions of the spline shaft matching the inner dimensions of the first spline cylinder, the spline shaft having evenly distributed insertion holes, a pin matching the insertion hole inserted into the end of the second spline cylinder, and a second servo motor fixedly mounted on the frame.

[0010] Preferably, a worm gear is fixedly mounted on the second splined cylinder, and a worm is meshed with the outer side of the worm gear, the worm being fixedly mounted on the drive shaft of the second servo motor.

[0011] Preferably, the teeth on the first gear are only half a turn, and a reset mechanism is installed on the right side of the multiple rotating drums. The reset mechanism includes a bushing that is movably sleeved on the outside of the right end of the shaft and rotatably installed inside the cylinder. The bushing is fixedly connected to the frame, and a fixing plate corresponding to the multiple rotating drums is fixedly fixed on the bushing. A tension spring is fixedly connected between the fixing plate and the corresponding rotating drum.

[0012] Preferably, the second shaft cylinder has a groove, and a positioning pin is fixedly installed on the bushing inside the groove.

[0013] Preferably, a rotating shaft is rotatably installed inside the frame, and the rotating shaft is fixedly connected to the guide plate. A second lever is fixedly installed at the end of the rotating shaft, and a fastening bolt is installed at the end of the second lever.

[0014] Preferably, baffles are fixedly installed around the left and right sides of the cylindrical surface, with the left baffle located to the right of the left edge of the arc-shaped permanent magnet and the right baffle located to the left of the right edge of the arc-shaped permanent magnet.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by using this device to perform dry magnetic separation of iron ore raw materials in a coarse and fine manner based on a two-stage closed-circuit fine crushing process, the iron grade of the final concentrate can be effectively improved. At the same time, by rotating multiple interlocking drums between the inner end wall of the cylinder and the arc-shaped permanent magnet, and by setting magnetic shielding plates on the drums, the device can flexibly control the magnetic attraction intensity of the arc-shaped permanent magnet acting on the cylindrical surface of the cylinder by adjusting the number of magnetic shielding plates between the inner end wall of the cylinder and the arc-shaped permanent magnet. This can effectively improve the versatility of a single dry drum magnetic separator. In coarse and fine multi-condition magnetic separation operations, there is no need to customize multiple dry drum magnetic separators with different magnetic attraction intensities, which effectively improves the convenience of implementing the magnetic separation process, thereby helping to reduce production costs and improve production efficiency to a certain extent. 2. In this invention, by setting the cylinder bodies of two adjacent rotating cylinders to slide and fit together, the inner rotating cylinder can support the outer rotating cylinder. In conjunction with setting the outermost rotating cylinder to slide and fit against the inner end wall of the cylinder, the cylinder body can be stably supported from all directions by the cooperation of multiple rotating cylinders. This helps to reduce the probability of the cylindrical surface of the cylinder being dented and damaged by the impact of iron ore, and to a certain extent extends the service life of the device. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the cylinder and baffle of the present invention; Figure 3 This is a perspective view of the arc-shaped permanent magnet, the first lever, and the hydraulic telescopic rod of the present invention. Figure 4 This is a perspective view of the rotating drum and drive mechanism of the present invention; Figure 5 This is an exploded view of the first splined barrel, the second splined barrel, and the splined shaft of the present invention; Figure 6 This is an exploded view of the multiple rotating drums and the reset mechanism of the present invention; Figure 7 This is a perspective view of the bushing, fixing plate, and locating pin of the present invention; Figure 8 For the present invention Figure 1 Top view of the structure; Figure 9 For the present invention Figure 8 Sectional view at point AA; Figure 10 For the present invention Figure 8 Sectional view at point BB; Figure 11 For the present invention Figure 1 Left view of the middle structure; Figure 12 For the present invention Figure 11 Sectional view at point CC.

[0017] In the picture: 1. Frame; 11. Cylinder; 12. First tank; 13. Second tank; 14. First servo motor; 2. Shaft; 21. Sector-shaped frame; 22. Arc-shaped permanent magnet; 23. First lever; 24. Hydraulic telescopic rod; 3. Rotating drum; 31. First shaft drum; 32. Second shaft drum; 33. Magnetic shielding plate; 34. Non-magnetic plate; 4. First gear; 41. First splined cylinder; 42. Second gear; 43. Second splined cylinder; 44. Splined shaft; 45. Socket; 46. Pin; 47. Second servo motor; 48. Worm gear; 49. Worm; 5. Bushing; 51. Fixing plate; 52. Tension spring; 53. Slot; 54. Locating pin; 6. Guide plate; 61. Rotating shaft; 62. Second lever; 63. Fastening bolt; 7. Baffle. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example: This example provides a dry drum magnetic separator, see [link to example]. Figure 1 - Figure 12Specifically, the system includes a frame 1, within which a cylinder 11 is rotatably mounted. A first groove 12 is fixedly mounted at the bottom of the frame 1. A second groove 13 located on the front of the cylinder 11 is fixedly mounted inside the frame 1. A first servo motor 14 for driving the cylinder 11 to rotate is fixedly mounted on the frame 1. A shaft 2 passing through the central axis of the cylinder 11 is mounted inside the frame 1, and a sector-shaped frame 21 located inside the cylinder 11 is fixedly mounted on the shaft 2. An arc-shaped permanent magnet 22 facing the second groove 13 is fixedly mounted on the sector-shaped frame 21. A magnetic isolation mechanism is provided between the cylinder 11 and the arc-shaped permanent magnet 22. The device includes multiple interlocking rotating cylinders 3, which are coaxially arranged. A first shaft cylinder 31 is fixedly installed at the center of the left end of each rotating cylinder 3, and the multiple first shaft cylinders 31 are interlocked. A second shaft cylinder 32 is fixedly installed at the center of the right end of each rotating cylinder 3. A magnetic shielding plate 33 is provided on the cylindrical surface of the rotating cylinder 3, and the non-magnetic shielding plate 33 area on the cylindrical surface of the rotating cylinder 3 is set as a non-magnetic plate 34. A drive mechanism for driving the multiple rotating cylinders 3 to rotate is installed on the frame 1. A guide plate 6 is installed in the frame 1 between the first groove 12 and the second groove 13, and the end of the guide plate 6 near the second groove 13 is set as a downward inclined structure.

[0020] This device is used in the dry separation process of iron ore. During implementation, low-grade iron-bearing rock is transported by truck to the raw ore receiving bin for storage. It is then transported to the intermediate crushing buffer bin via a vibrating feeder and belt conveyor, and then fed into the cone crusher for intermediate crushing. The intermediate crushed product is then fed to two circular vibrating screens for screening. The material on the screens is fed to the fine crushing buffer bin, and the material in the bin is fed back into the two cone crushers for fine crushing. The fine crushed product is then fed into the circular vibrating screen for screening, realizing a two-stage closed-loop fine crushing process. This process can efficiently and stably cope with the uncertainty of the incoming material properties and quantity, and control the particle size of the crushed product to below 8mm, creating favorable conditions for the quality improvement of dry magnetic separation of iron ore.

[0021] The screened product is fed into one of the devices via a belt conveyor for roughing. The roughing concentrate is transported to another device for cleaning. Finally, the cleaned iron ore is transported to the ore stockpile, then loaded and unloaded by a front-loading machine and transported by truck. The waste rock remaining from the roughing and cleaning processes is stockpiled in the spoil heap. The dry magnetic separation process of roughing and cleaning can ensure that the iron grade of the final concentrate is above 25%. Based on this process, the dry drum magnetic separator of this application is selected to perform magnetic separation on the iron ore. During operation, a belt conveyor is connected above the cylinder 11 for feeding iron ore, a belt conveyor is connected below the first tank 12 for outputting the screened ore, and a belt conveyor is connected below the second tank 13 for outputting waste rock.

[0022] During operation, the first servo motor 14 is powered on and starts, driving the cylinder 11, which is connected to its drive shaft, to rotate continuously. Figure 9 With the reference cylinder 11 in the center, it is driven to rotate clockwise. Iron ore raw materials with a particle size controlled below 8mm fall evenly from the upper front position of the cylinder 11, dispersing on the cylindrical surface of the cylinder 11. Under the action of gravity and guided by the rotation of the cylinder 11, the iron ore raw materials slide down the cylindrical surface of the front of the cylinder 11. During this process, the arc-shaped permanent magnet 22 installed on the inner side of the cylinder 11 performs magnetic separation on the iron ore raw materials. With the help of the magnetic adsorption effect of the arc-shaped permanent magnet 22 on the iron ore, the ore with high iron content is separated. Adhering to the cylindrical surface of the cylinder 11, under the continuous rotation of the cylinder 11, the ore with high iron content is transported to the top of the first tank 12. When the ore with high iron content passes the arc-shaped permanent magnet 22, the magnetic attraction of the iron ore by the arc-shaped permanent magnet 22 is greatly reduced. At this time, under the action of gravity, the ore with high iron content falls into the first tank 12, while the ore with low iron content cannot be attracted and will fall vertically downward. Under the guidance of the guide plate 6, it enters the second tank 13 to complete the magnetic separation operation of the iron ore.

[0023] When the device is installed in different stages for coarse or fine selection, the magnetic shielding plate 33 can be made of ferrite or nickel-zinc ferrite materials according to actual needs, and the non-magnetic plate 34 can be made of austenitic stainless steel. The magnetic attraction strength of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11 needs to be adjusted accordingly. At this time, the operator only needs to control the rotation of multiple rotating cylinders 3 through the drive mechanism. When the magnetic shielding plate 33 on the cylindrical surface of the rotating cylinder 3 rotates between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, it can weaken the magnetic attraction strength of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11. When the non-magnetic plate 34 on the cylindrical surface of the rotating cylinder 3 rotates between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, it will not affect the magnetic attraction strength of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11.

[0024] This allows the device to flexibly control the magnetic attraction intensity of the arc-shaped permanent magnet 22 acting on the cylindrical surface of the cylinder 11 by adjusting the number of magnetic isolation plates 33 between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22. When the number of magnetic isolation plates 33 between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22 increases, the magnetic attraction intensity of the arc-shaped permanent magnet 22 acting on the cylindrical surface of the cylinder 11 decreases. When the number of magnetic isolation plates 33 between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22 decreases, the magnetic attraction intensity of the arc-shaped permanent magnet 22 acting on the cylindrical surface of the cylinder 11 increases. There is no need to customize multiple dry drum magnetic separators with different magnetic attraction intensities. The above structural settings greatly improve the versatility of a single dry drum magnetic separator and effectively enhance the convenience of operation.

[0025] In the specific implementation process, such as Figure 3 and Figure 11 As shown, shaft 2 is rotatably connected to frame 1. A first lever 23 is fixedly installed at the end of shaft 2, and a hydraulic telescopic rod 24 is hinged between the end of the first lever 23 and frame 1. When the device is in use, after the hydraulic telescopic rod 24 is powered on, its piston rod can be extended and retracted. Since the hydraulic telescopic rod 24 is hinged between the first lever 23 and frame 1, the extension and retraction of the piston rod of the hydraulic telescopic rod 24 can pull the first lever 23 to control the rotation of shaft 2, and make a small-amplitude rotational adjustment of the position of the arc-shaped permanent magnet 22. By changing the relative position of the arc-shaped permanent magnet 22 and the cylindrical surface of the cylinder 11, the magnetic deflection angle can be adjusted, and the magnetic field strength can be locally optimized, thereby ensuring the effect of the device in magnetic separation of iron ore.

[0026] In the specific implementation process, such as Figure 9 and Figure 10 As shown, the thickness of the magnetic shielding plates 33 on the multiple rotating cylinders 3 decreases layer by layer from the inside to the outside. When the device is in use, as the multiple rotating cylinders 3 are rotated, the magnetic shielding plates 33 on their cylindrical surfaces are sequentially screwed into or out of the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22 from the inside to the outside. As the thickness of the magnetic shielding plates 33 between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22 gradually increases, the magnetic attraction strength of the arc-shaped permanent magnet 22 acting on the cylindrical surface of the cylinder 11 decreases sharply. In this device, the thickness of the arc-shaped permanent magnet 22 on the cylindrical surfaces of the multiple rotating cylinders 3 is set to be different, so that… The thickness decreases layer by layer from the inside out. By controlling the thickness of the magnetic shielding plate 33, the magnetic attraction intensity of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11 decreases by the same amount with each orderly addition of a magnetic shielding plate 33, and the magnetic attraction intensity of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11 increases by the same amount with each orderly removal of a magnetic shielding plate 33. This allows the device to achieve linear control of the magnetic attraction intensity of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11 by controlling the rotation of multiple rotating cylinders 3, which improves the ease of operation of the device in actual use to a certain extent.

[0027] In the specific implementation process, such as Figure 9 and Figure 10As shown, the walls of two adjacent rotating cylinders 3 slide against each other, and the wall of the outermost rotating cylinder 3 slides against the inner end wall of the cylinder 11. The wall of the innermost rotating cylinder 3 slides against the arc-shaped permanent magnet 22. When the device is in use, multiple rotating cylinders 3 are nested together, and the cylinder bodies of two adjacent rotating cylinders 3 slide against each other. This allows the inner rotating cylinder 3 to support the outer rotating cylinder 3, while the outermost rotating cylinder 3 can support the cylinder body of the cylinder 11. With their cooperation, the stability of the cylinder body of the cylinder 11 can be effectively improved, which helps to reduce the probability of the cylindrical surface of the cylinder 11 being dented and damaged by the impact of iron ore, and to a certain extent extends the service life of the device.

[0028] In the specific implementation process, such as Figure 4 - Figure 7 , Figure 10 and Figure 12 As shown, the drive mechanism includes a first gear 4 fixedly installed at the end of the first shaft cylinder 31. Multiple coaxially arranged first spline cylinders 41 are rotatably mounted on the frame 1. A second gear 42 is fixedly installed on each first spline cylinder 41. The multiple second gears 42 are corresponding to the multiple first gears 4 and mesh with each other. A second spline cylinder 43 coaxially arranged with the first spline cylinder 41 is fixedly installed on the frame 1. A spline shaft 44 is slidably inserted into the second spline cylinder 43. The outer dimensions of the spline shaft 44 are adapted to the inner dimensions of the first spline cylinder 41. The spline shaft 44 has evenly distributed insertion holes 45. A pin 46 adapted to the insertion hole 45 is inserted into the end of the second spline cylinder 43. A second servo motor 47 is fixedly installed on the frame 1.

[0029] The teeth on the first gear 4 are only half a turn. A reset mechanism is installed on the right side of the multiple rotating drums 3. The reset mechanism includes a bushing 5 that is movably sleeved on the outside of the right end of the shaft 2 and rotatably installed in the cylinder 11. The bushing 5 is fixedly connected to the frame 1. A fixing plate 51 corresponding to the multiple rotating drums 3 is fixed on the bushing 5. A tension spring 52 is fixedly connected between the fixing plate 51 and the corresponding rotating drum 3.

[0030] When using this device, during the rotational drive of multiple rotating drums 3 using the drive mechanism, the rotation of the multiple rotating drums 3 is driven from the inside out. When it is necessary to control the rotation of the innermost rotating drum 3, the operator pushes the spline shaft 44 into the first spline cylinder 41, so that the spline shaft 44 inserted in the second spline cylinder 43 is inserted into the first first spline cylinder 41. When the second servo motor 47 is powered on and drives the second spline cylinder 43 to rotate, the first first spline cylinder 41 can be driven to rotate through the transmission connection of the spline shaft 44, which drives the second gear 42 fixed on it to rotate synchronously. Then, by means of the meshing of the second gear 42 with the corresponding first gear 4, the rotating drum 3 connected to it is driven to rotate. Since the teeth on the first gear 4 are only set with half a turn, when the second... When gear 42 meshes with the teeth of the corresponding first gear 4, the first gear 4 cannot be driven to continue rotating as the second gear 42 continues to rotate. At this time, the magnetic shielding plate 33 moves precisely between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, thus blocking the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11. When it is necessary to control the rotation of the two inner rotating cylinders 3, the operator only needs to further push the spline shaft 44 so that the spline shaft 44 is inserted into the first and second first spline cylinders 41, driving the first two second gears 42 to rotate, thereby controlling the rotation of the two inner rotating cylinders 3 and rotating the magnetic shielding plate 33 set on their cylindrical surface between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22. Therefore, this device only requires gradually pushing the spline shaft 44. By inserting it into multiple first splined cylinders 41, the rotation control of multiple rotating cylinders 3 can be realized, and the magnetic shielding plates 33 on the cylindrical surfaces of multiple rotating cylinders 3 can be gradually transferred between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22.

[0031] When it is necessary to enhance the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11, the operator only needs to pull the spline shaft 44 outward to gradually reduce the number of first spline cylinders 41 inserted into the spline shaft 44. When the spline shaft 44 is no longer inserted into the first spline cylinder 41, the second gear 42 is no longer driven to rotate. At this time, with the elastic pull of the tension spring 52 on the fixed plate 51 on the rotating cylinder 3, the corresponding rotating cylinder 3 can rotate in the opposite direction to restore the initial state, so that the magnetic shielding plate 33 is removed, and the non-magnetic plate 34 rotates to the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, no longer attracting the arc-shaped permanent magnet. The magnetic attraction of the body 22 on the cylindrical surface of the cylinder 11 creates a barrier, which increases the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11. Through the cooperation of the drive mechanism and the reset mechanism, the device allows the operator to flexibly and stably drive the multiple interlocking rotating cylinders 3 to rotate and reset in the opposite direction. It is convenient to control the position of the magnetic shielding plates 33 and spline shafts 44 on the cylindrical surfaces of the multiple rotating cylinders 3 as needed. Furthermore, the operator can judge the position status of the multiple magnetic shielding plates 33 based on the insertion of the spline shafts 44, which can effectively improve the ease of use of the device.

[0032] In the specific implementation process, such as Figure 4 , Figure 5 and Figure 12 As shown, a worm gear 48 is fixedly mounted on the second splined cylinder 43, and a worm 49 is meshed with the outer side of the worm gear 48. The worm 49 is fixedly mounted on the drive shaft of the second servo motor 47. When the device is in use, the worm gear 48 is fixedly mounted on the second splined cylinder 43, and the worm 49 meshing with the worm gear 48 is fixedly mounted on the drive shaft of the second servo motor 47. After the second servo motor 47 is powered on and started, it first drives the worm 49 to rotate, and then drives the worm gear 48 to rotate the second splined cylinder 43 under the meshing of the teeth. With the self-locking property formed by the meshing transmission between the worm 49 and the worm gear 48, the second splined cylinder 43 cannot rotate when the second servo motor 47 is not started. Thus, after the rotating cylinder 3 is rotated and adjusted by the drive mechanism, it automatically maintains a stable position, which can effectively ensure the stability of the device during use.

[0033] In the specific implementation process, such as Figure 6 and Figure 7 As shown, a slot 53 is provided on the second shaft cylinder 32, and a positioning pin 54 is fixedly installed on the bushing 5 inside the slot 53. When the device is in use, the amplitude of the rotation of the rotating cylinder 3 can be controlled by the cooperation of the slot 53 and the positioning pin 54. This allows the magnetic shielding plate 33 to be precisely blocked between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22 when the rotating cylinder 3 is rotated. This helps to ensure the accuracy of the device in adjusting the magnetic attraction strength of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11, and thus helps to ensure the stability of the device in actual use.

[0034] In the specific implementation process, such as Figure 1 , Figure 8 , Figure 9 and Figure 11 As shown, a rotating shaft 61 is rotatably installed inside the frame 1, and the rotating shaft 61 is fixedly connected to the guide plate 6. A second lever 62 is fixedly installed at the end of the rotating shaft 61, and a fastening bolt 63 is installed at the end of the second lever 62. When the device is in use, the operator can rotate the rotating shaft 61 by moving the second lever 62, thereby adjusting the tilt angle of the guide plate 6. By rotating and adjusting the guide plate 6, the gap between the guide plate 6 and the cylindrical surface of the cylinder 11 can be flexibly adjusted, which is convenient for guiding different specifications of ore particles and helps to improve the applicability of the device. By installing the fastening bolt 63 at the end of the second lever 62, the position of the guide plate 6 can be fixed after the tilt angle of the guide plate 6 is adjusted. The operation is flexible and convenient, ensuring the stability of the guide plate 6 during use.

[0035] In the specific implementation process, such as Figure 1 , Figure 2 , Figure 10 and Figure 12 As shown, baffles 7 are fixedly installed on the left and right sides of the cylindrical surface of the cylinder 11. The left baffle 7 is located to the right of the left edge of the arc-shaped permanent magnet 22, and the right baffle 7 is located to the left of the right edge of the arc-shaped permanent magnet 22. When the device is in use, the baffles 7 are made of magnetic shielding material. By installing the baffles 7 on the left and right sides of the cylindrical surface of the cylinder 11, the actual working area of ​​the device can be marked. By separating the left and right edges of the arc-shaped permanent magnet 22 by the baffles 7, the interference caused by the uneven magnetic attraction intensity at the edge of the arc-shaped permanent magnet 22 on the magnetic separation of iron ore can be avoided, which is conducive to ensuring the stability of the device during operation.

[0036] Specifically, the working principle of this invention is as follows: Through the cooperation of the drive mechanism and the reset mechanism, the position of the magnetic shielding plates 33 on the cylindrical surfaces of multiple rotating drums 3 is adjusted. The number of rotating drums 3 is controlled as needed, and the number of spline shafts 44 inserted into the first spline drums 41 is adjusted by pushing the spline shaft 44. After the second servo motor 47 is powered on and started, the second spline drums 43 are driven to rotate by the meshing transmission of the worm gear 49 and the worm wheel 48, thereby driving the spline shaft 44 to rotate, which in turn drives the multiple first spline drums 41 inserted into the spline shaft 44 to rotate. Through the meshing of the second gear 42 with the corresponding first gear 4, the rotating drum 3 connected to it is driven to rotate. Since the first gear 4 only has half a circle of teeth, when the second gear 42 does not mesh with the teeth on the corresponding first gear 4, the second gear 42 continues to rotate, and the first gear 4 cannot be driven to rotate. At this time, the magnetic shielding plates 33 on the corresponding rotating drum 3 are just moved. The magnetic plate 33 moves between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, weakening the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11. Meanwhile, the rotating cylinder 3 corresponding to the first splined cylinder 41 that is not connected to the splined shaft 44 remains in a stable position under the elastic tension of the tension spring 52. In this state, the non-magnetic plate 34 on the corresponding rotating cylinder 3 is located between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, and does not affect the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11. By adjusting the number of magnetic isolation plates 33 moving between the inner end wall of the cylinder 11 and the arc-shaped permanent magnet 22, the magnetic attraction of the arc-shaped permanent magnet 22 on the cylindrical surface of the cylinder 11 can be flexibly adjusted according to the working conditions. Using this device, appropriate magnetic attraction intensities can be selected in different working stages to perform coarse and fine iron ore separation operations.

[0037] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dry drum magnetic separator, comprising a frame (1), characterized in that: A cylinder (11) is rotatably mounted inside the frame (1). A first groove (12) is fixedly mounted at the bottom of the frame (1). A second groove (13) is fixedly mounted inside the frame (1). A first servo motor (14) is fixedly mounted on the frame (1). A shaft (2) passing through the central axis of the cylinder (11) is mounted inside the frame (1). A sector-shaped frame (21) located inside the cylinder (11) is fixedly mounted on the shaft (2). An arc-shaped permanent magnet (22) is fixedly mounted on the sector-shaped frame (21). A magnetic isolation mechanism is provided between the cylinder (11) and the arc-shaped permanent magnet (22). The magnetic isolation mechanism includes multiple interlocking rotating cylinders (3). The rotating drum (3) is coaxially arranged, with a first shaft cylinder (31) fixedly installed at the center of the left end of the rotating drum (3), and multiple first shaft cylinders (31) are nested together. A second shaft cylinder (32) is fixedly installed at the center of the right end of the rotating drum (3). A magnetic shielding plate (33) is provided on the cylindrical surface of the rotating drum (3), and the non-magnetic shielding plate (33) area of ​​the cylindrical surface of the rotating drum (3) is set as a non-magnetic plate (34). A drive mechanism for driving multiple rotating drums (3) to rotate is installed on the frame (1). A guide plate (6) is installed in the frame (1) between the first groove (12) and the second groove (13), and the end of the guide plate (6) near the second groove (13) is set as a downward inclined structure.

2. The dry drum magnetic separator according to claim 1, characterized in that: The shaft (2) is rotatably connected to the frame (1). A first lever (23) is fixedly installed at the end of the shaft (2), and a hydraulic telescopic rod (24) is hinged between the end of the first lever (23) and the frame (1).

3. A dry drum magnetic separator according to claim 1, characterized in that: The thickness of the magnetic shielding plates (33) on the multiple rotating drums (3) decreases layer by layer from the inside to the outside.

4. A dry drum magnetic separator according to claim 1, characterized in that: The walls of two adjacent rotating cylinders (3) slide against each other. The wall of the outermost rotating cylinder (3) slides against the inner end wall of the cylinder (11), and the wall of the innermost rotating cylinder (3) slides against the arc-shaped permanent magnet (22).

5. A dry drum magnetic separator according to claim 1, characterized in that: The drive mechanism includes a first gear (4) fixedly installed at the end of the first shaft cylinder (31). Multiple coaxially arranged first spline cylinders (41) are rotatably installed on the frame (1). A second gear (42) is fixedly installed on each first spline cylinder (41). The multiple second gears (42) are correspondingly arranged with the multiple first gears (4) and mesh with each other. A second spline cylinder (43) coaxially arranged with the first spline cylinder (41) is fixedly installed on the frame (1). A spline shaft (44) is slidably inserted into the second spline cylinder (43). The outer dimension of the spline shaft (44) is adapted to the inner dimension of the first spline cylinder (41). The spline shaft (44) is provided with evenly distributed insertion holes (45). A pin (46) adapted to the insertion hole (45) is inserted into the end of the second spline cylinder (43). A second servo motor (47) is fixedly installed on the frame (1).

6. A dry drum magnetic separator according to claim 5, characterized in that: A worm gear (48) is fixedly installed on the second splined cylinder (43), and a worm (49) is meshed with the outer side of the worm gear (48). The worm (49) is fixedly installed on the drive shaft of the second servo motor (47).

7. A dry drum magnetic separator according to claim 5, characterized in that: The teeth on the first gear (4) are only half a turn. A reset mechanism is installed on the right side of the multiple rotating cylinders (3). The reset mechanism includes a bushing (5) that is movably sleeved on the outside of the right end of the shaft (2) and rotatably installed in the cylinder (11). The bushing (5) is fixedly connected to the frame (1). A fixing plate (51) corresponding to the multiple rotating cylinders (3) is fixed on the bushing (5). A tension spring (52) is fixedly connected between the fixing plate (51) and the corresponding rotating cylinder (3).

8. A dry drum magnetic separator according to claim 7, characterized in that: The second shaft (32) has a slot (53) and the bushing (5) has a positioning pin (54) fixedly installed inside the slot (53).

9. A dry drum magnetic separator according to claim 8, characterized in that: A rotating shaft (61) is rotatably installed inside the frame (1), and the rotating shaft (61) is fixedly connected to the guide plate (6). A second lever (62) is fixedly installed at the end of the rotating shaft (61), and a fastening bolt (63) is installed at the end of the second lever (62).

10. A dry drum magnetic separator according to claim 1, characterized in that: The cylindrical surface of the cylinder (11) is fixedly equipped with baffles (7) arranged around it. The baffle (7) on the left is located to the right of the left edge of the arc-shaped permanent magnet (22), and the baffle (7) on the right is located to the left of the right edge of the arc-shaped permanent magnet (22).

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