Double-machine linkage semi-reverse-flow magnetic separation device

Abstract

The double-machine linkage semi-reverse-flow magnetic separation device comprises a first magnetic separation device body and a second magnetic separation device body which are the same in structure and symmetrically installed, the first magnetic separation device body and the second magnetic separation device body each comprise a box groove, a cylinder is rotationally installed in each box groove, and a separation plate is arranged below each cylinder. According to the double-machine linkage semi-reverse-flow type magnetic separation device, the material box is arranged at the top ends of the cylinders, ore pulp is sprayed to the surfaces of the cylinders through the discharging pipes, then flows downwards and impacts on the protrusions, magnetic particles and non-magnetic particles are promoted to be separated, the two cylinders which are symmetrically arranged are used for blocking the ore pulp thrown away under the centrifugal effect, and the magnetic separation efficiency is improved. The ore pulp impacts on the blocked cylinder to further promote magnetic and non-magnetic particles to be separated and flow along the surface of the current cylinder, the magnetic particles in the ore pulp are pre-screened through the pre-screening magnetic system, the adsorption time of the magnetic particles is prolonged, the probability that the magnetic particles are adsorbed on the surface of the cylinder is increased, and the purpose of improving the grade of concentrate is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic separation, and specifically to a semi-countercurrent magnetic separation device with dual-machine linkage. Background Art

[0002] The wet permanent magnet drum type magnetic separator (CTB type) for iron separation is composed of four parts: a cylinder, a magnetic system, a tank body, and a transmission device. The production process is briefly described as follows: The water-quenched slag after rotary kiln roasting is ground by a ball mill, and the ground powder is mixed with water to form a pulp. The pulp uniformly flows into the dewatering tank through a feed pipe. Due to the action of pressure, it enters the separation chamber from bottom to top. And the inlet of the separation chamber is exactly the area where the magnetic field force acts. Therefore, the pulp flow rises vertically and is adsorbed on the surface of the drum. As the drum rotates, the ferromagnetic substances are taken out of the magnetic field area and after getting out of the magnetic field force, they flow into the concentrate box under the action of their own weight and the impact of the flushing water. The alternating change of the magnetic NS poles causes the ferromagnetic substances to flip during the process of getting out of the separation chamber, effectively removing non-ferromagnetic substances and obtaining a higher-grade concentrate. The weakly magnetic and non-magnetic minerals are thrown off and discharged. The strongly magnetic minerals adsorbed on the surface of the cylinder rotate with the cylinder skin, are taken out of the magnetic field area, and are flushed into the concentrate tank with flushing water. When the pulp enters the magnetic field area, the strongly magnetic minerals in it are adsorbed on the surface of the cylinder. When the pulp fills the separation chamber, it then flows in the reverse direction of the drum. After passing through a long strong magnetic field scavenging area, the ferromagnetic substances are fully separated and discharged from the tailings, making the grade of the tailings lower.

[0003] For the currently market-applied semi-countercurrent drum type magnetic separation device, since the magnetic poles are located inside the cylinder and the separation chamber also has a certain height, as the pulp passes through the separation chamber on the outer side of the cylinder, during the process that the magnetic particles are attracted by the magnetic force and move towards the cylinder, the magnetic particles are hindered by the resistance of the pulp and their own gravity. It is very difficult for the magnetic particles with weaker magnetic attraction to approach the cylinder and be adsorbed on the cylinder, which affects the separation of the magnetic particles. In addition, if the viscosity of the pulp is large, the magnetic particles are more tightly wrapped by non-magnetic particles. In a separation chamber with a relatively small length, the effect of promoting the separation of magnetic particles and non-magnetic particles only by the magnetic stirring of the magnetic field is often poor. A large number of magnetic particles are mixed in the tailings, increasing the grade of the tailings. Instead, a large number of non-magnetic particles are contained in the concentrate after separation, resulting in a lower grade, both of which lead to incomplete separation of the magnetic particles. Summary of the Invention

[0004] The present application proposes a semi-countercurrent magnetic separation device with dual-machine linkage, which has the advantages of promoting the approach of magnetic particles to the cylinder and good separation of magnetic particles and non-magnetic particles, so as to solve the problems raised in the above background art.

[0005] To achieve the above object, the present application adopts the following technical solutions: A semi-countercurrent magnetic separation device with dual-machine linkage, including magnetic separation device one and magnetic separation device two which have the same structure and are symmetrically installed. Both magnetic separation device one and magnetic separation device two include a tank. A cylinder is rotatably installed in the tank. A sorting plate is provided below the cylinder. Oblique water holes are formed on the sorting plate and are inclined towards the side where the cylinder rotates. The center line of the cross-section of the oblique water holes is tangent to the outer wall of the cylinder. A feed box is provided above the cylinder. A pre-screen magnetic system is arranged inside the cylinder. A mixing tank is commonly connected to the side where the two tanks are close to each other. A jet mechanism for pumping water into the oblique water holes is arranged in the tank.

[0006] Furthermore, flushing water pipes are installed above both feed boxes. The outlet ends of the sides where the two feed boxes are close to each other are both connected to a discharge pipe. A top cover located between the two feed boxes is installed at the top of the tank. The top cover is arc-shaped and is located above the discharge pipe. Flushing pipes are provided below both ends of the top cover. A spraying gap is formed between the discharge pipe and the top cover. A water spraying port facing the spraying gap is provided on the flushing pipe. Protrusions are evenly arranged on the outer wall of the cylinder.

[0007] Furthermore, the jet mechanism includes a water equalizing tank, a water pumping tank, a water storage tank, water inlet assembly one and water inlet assembly two. The water equalizing tank is arranged below the sorting plate. A water inlet check valve is installed on the water equalizing tank. A water pumping tank is arranged on each side below the water equalizing tank. A water pushing plate is slidably connected inside each water pumping tank. The water storage tank is arranged on the outer walls of the sorting plate and the water pumping tank and is located at the outlet end of the sorting tank. The top wall of the water storage tank is smooth and arc-shaped and is tangent to the surface of the sorting plate. A water storage hole is formed on the top wall of the water storage tank. A water pumping check valve is installed on the inner side wall of the water pumping tank. The inlet end of the water pumping check valve is located at the bottom of the inner cavity of the water storage tank. The outlet end of the water pumping check valve is located at the top of the inner cavity of the water pumping tank. The bottom ends of the two water pushing plates are respectively provided with water inlet assembly one and water inlet assembly two. Water inlet assembly one and water inlet assembly two are respectively used to push the respective connected water pushing plates to move up and down in the corresponding water pumping tanks.

[0008] Furthermore, water inlet assembly one includes an outer cover, a cam, a wheel shaft, a push rod, a cover, and a spring. The outer cover is arranged below the water pumping tank. The cam is located inside the outer cover. The wheel shaft is connected to the shaft hole of the cam. The push rod is connected to the bottom wall of the water pushing plate. The bottom end of the push rod is connected to the cover. The cover is in the shape of a bowl with an upward opening. The outer wall of the cover is in contact with the outer wall of the cam. A spring is sleeved on the outer periphery of the push rod. The two ends of the spring are respectively pressed against the outer wall of the water pumping tank and the inner wall of the cover. The cam inside water inlet assembly two is arranged in a centrosymmetric state with the cam inside water inlet assembly one and shares the wheel shaft.

[0009] Further, flow control gate plates are provided at the connection parts on both sides of the mixing tank. One end of each flow control gate plate is connected to a plate shaft. The other end of the flow control gate plate is rotatably and sealingly connected to the tank through a shaft rod. The plate shaft is rotatably and sealingly connected to the tank. A gear is sleeved on the end of the plate shaft. Below the gear, there is a seat box installed on the frame. A rack is slidably connected inside the seat box. The gear meshes with the rack. An electric telescopic rod is installed inside the seat box. The driving end of the electric telescopic rod is fixedly connected to the end of the rack. The gears of the first magnetic separation device and the second magnetic separation device are meshed on the same rack. A shaft seat is sleeved on the outer periphery of the plate shaft. The shaft seat is installed on the outer wall of the seat box.

[0010] Further, a magnetic system shaft is rotatably sleeved in the middle of the cylinder. A main screening magnetic system and a pre-screening magnetic system are installed on both magnetic system shafts. Both the main screening magnetic system and the pre-screening magnetic system are composed of several alternately arranged magnetic poles. The pre-screening magnetic system is located on one side of the inside of the cylinder near the outlet end of the feed box. End covers I and II are respectively connected to both ends of the cylinder. The magnetic system shaft penetrates through end cover I and is connected to an adjustment arm. The magnetic system shaft is rotatably connected to end cover I. One end of the magnetic system shaft located inside the cylinder is rotatably sleeved with a cylinder shaft. The cylinder shaft penetrates through end cover II and is fixedly connected to end cover II. The cylinder shaft is connected to the rotating shaft of the motor through a transmission. The motor is installed on the frame.

[0011] Further, a feed trough, a separation trough, a tailing trough and a tailing pipe which are connected in sequence are provided in the tank. The feed trough is communicated with the mixing trough. A concentrate hopper located on the side of the cylinder is provided on the tank. A discharge water pipe is installed above the concentrate hopper. An arc-shaped scraping plate is provided at the top of the outer trough wall of the tailing trough. The scraping plate is tangent to the arc-shaped outer trough wall of the separation plate. A particle gap is formed between the scraping plate and the cylinder. The width of the particle gap is between one-third and one-half of the width of the separation trough.

[0012] The present invention has the following beneficial effects: 1. A double-machine linkage semi-countercurrent magnetic separation device provided by the present application. By arranging the feed box at the top of the cylinder, the pulp is sprayed on the surface of the cylinder through the discharge pipe and then flows downward and impacts on the protrusions, promoting the separation of magnetic particles and non-magnetic particles. The two symmetrically arranged cylinders are used to block the pulp thrown off by the centrifugal force. The pulp impacts on the blocked cylinder, further promoting the separation of magnetic and non-magnetic particles and flowing along the surface of the current cylinder. The pre-screening magnetic system is used to pre-screen the magnetic particles in the pulp, prolonging the duration of adsorption of the magnetic particles and increasing the probability of the magnetic particles being adsorbed on the surface of the cylinder, so as to achieve the purpose of improving the concentrate grade.

[0013] 2. The double-machine linkage semi-countercurrent magnetic separation device provided by the present application sets the material box at the top of the cylinder. The pulp is sprayed on the surface of the cylinder through the discharge pipe and then flows downward and impacts on the protrusions. Small eddies are generated at the protrusions of the pulp, promoting the mutual flow of the inner and outer layers of the pulp, enabling the outer-layer pulp to approach the cylinder, which is beneficial for the magnetic particles in the outer-layer pulp to contact the cylinder, further increasing the probability of contact between the magnetic particles and the cylinder, and achieving the purpose of improving the separation effect.

[0014] 3. The double-machine linkage semi-countercurrent magnetic separation device provided by the present application opens inclined water holes on the sorting plate and alternately sucks and presses water by using the first water inlet component and the second water inlet component, so that there is always water in the water equalizing cavity of the water equalizing tank spraying into the sorting tank through the inclined water holes. Since the inclined water holes are inclined towards the direction of the rotation of the cylinder and the center line of the inclined water holes is tangent to the outer wall of the cylinder, the water flow is used to impact the pulp in the sorting tank towards the inlet end of the sorting tank, delaying the flow speed of the pulp in the sorting tank, increasing the residence time of the pulp in the sorting tank, and increasing the probability that the magnetic ore particles are adsorbed on the outer wall of the cylinder under the action of the main sieve magnetic system. Moreover, the water flow sprayed from the inclined water holes promotes the pulp to flow towards the outer wall of the cylinder, shortening the distance between the magnetic particles and the main sieve magnetic system, further increasing the probability that the magnetic particles are adsorbed on the outer wall of the cylinder, and achieving the purpose of improving the concentrate grade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles disclosed in the present application.

[0016] Referring to the drawings, the present disclosure can be more clearly understood according to the following detailed description, wherein: Figure 1 is a schematic three-dimensional structure diagram of the whole application; Figure 2 is a cross-sectional view of the present application; Figure 3 is a cross-sectional structure view of the jet mechanism of the present application; Figure 4 is an exploded view of the structures of the cylinder, the main sieve magnetic system and the pre-sieve magnetic system of the present application; Figure 5 is a schematic partial three-dimensional structure diagram of the present application; Figure 6 is an exploded view of the structures of the sorting plate and the jet mechanism of the present application; Figure 7 is a schematic structure diagram of the first water component and the second water component of the present application; Figure 8 is a schematic structure diagram of the flow control gate plate of the present application; Figure 9 is a partial module diagram of the control system of the present application.

[0017] In the figure: 1000, Magnetic separation device 1; 1001, Magnetic separation device 2; 100, Box trough; 1, Cylinder; 101, End cover 1; 102, End cover 2; 2, Magnetic system shaft; 21, Cylinder shaft; 3, Main sieve magnetic system; 301, Pre-sieve magnetic system; 4, Feed box; 41, Flushing water pipe; 42, Discharge pipe; 43, Top cover; 44, Flushing pipe; 5, Sorting plate; 51, Feed trough; 52, Sorting trough; 53, Tailings trough; 54, Tailings pipe; 55, Concentrate hopper; 56, Ore discharge water pipe; 501, Inclined water hole; 6, Scraping arc plate; 7, Mixing trough; 8, Flow control gate; 81, Plate shaft; 82, Gear; 83, Rack; 84, Seat box; 85, Electric telescopic rod; 86, Shaft seat; 9, Jet mechanism; 91, Equalizing water trough; 911, Inlet check valve; 92, Water pumping trough; 921, Water pushing plate; 93, Water storage trough; 931, Water storage hole; 932, Water pumping check valve; 94, Inlet assembly 1; 941, Outer cover; 942, Cam; 943, Wheel shaft; 944, Push rod; 945, Cover; 946, Spring; 95, Inlet assembly 2; 10, Protrusion; 11, Frame; 12, Motor; 13, Adjusting arm. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] Please refer to Figure 1 、Appendix Figure 2 、Appendix Figure 3 、Appendix Figure 4 、Appendix Figure 5 、Appendix Figure 6 、Appendix Figure 7 、Appendix Figure 8As shown in the figure, a double-machine linked semi-countercurrent magnetic separation device includes a first magnetic separation device 1000, a second magnetic separation device 1001, and a frame 11. The first magnetic separation device 1000 and the second magnetic separation device 1001 have the same structure and are symmetrically installed on the frame 11. The first magnetic separation device 1000 is located on the right side of the second magnetic separation device 1001. Both the first magnetic separation device 1000 and the second magnetic separation device 1001 include a box trough 100. Inside both box troughs 100, there is a rotating cylinder 1. The two cylinders 1 rotate towards each other, that is, the cylinder 1 of the first magnetic separation device 1000 rotates counterclockwise, and the cylinder 1 of the second magnetic separation device 1001 rotates clockwise. On the outer walls of the two cylinders 1, there are evenly arranged protrusions 10. In the middle of both cylinders 1, there is a rotating magnetic system shaft 2 sleeved. On both magnetic system shafts 2, there are installed a main sieve magnetic system 3 and a pre-sieve magnetic system 301. At the top of both box troughs 100, there is a feed box 4 located directly above the cylinder 1. Inside both box troughs 100, there is a sorting plate 5 located below the cylinder 1. On one side where the two box troughs 100 are close to each other, there is a mixing trough 7 in common. Inside the box trough 100, there is a jet mechanism 9 located at the sorting plate 5.

[0020] Refer to Figure 1 and the attached Figure 2 As shown in the figure, inside both box troughs 100, there are successively connected a feed trough 51, a sorting trough 52, a tailing trough 53, and a tailing pipe 54. Among them, the inlet end of the feed trough 51 is connected to the mixing trough 7, and at the connection point, there is a flow control gate 8. The first magnetic separation device 1000 and the second magnetic separation device 1001 share a mixing trough 7. The mixing trough 7 is symmetric about the left and right, and its axis of symmetry is the axis of symmetry of the first magnetic separation device 1000 and the second magnetic separation device 1001. On the box trough 100, there is a concentrate hopper 55 located on the side of the cylinder 1. Above the concentrate hopper 55, there is a discharge water pipe 56. When the flow control gate 8 deflects, the mixing trough 7 is connected to the feed trough 51, and the pulp in the mixing trough 7 flows along the feed trough 51, the sorting trough 52, the tailing trough 53, and the tailing pipe 54. The magnetic mineral particles in the pulp are magnetically sieved in the sorting trough 52. Refer to the attached Figure 2 、the attached Figure 3 、the attached Figure 5 As shown in the figure, at the top of the outer trough wall of the tailing trough 53, there is integrally formed a scraping arc plate 6 in an arc shape. The scraping arc plate 6 is tangent to the arc-shaped outer trough wall of the tailing trough 53. There is a particle gap formed between the scraping arc plate 6 and the cylinder 1. The width of the particle gap is between one-third and one-half of the width of the sorting trough 52. The width of the particle gap is the vertical distance between the end of the scraping arc plate 6 and the outer wall of the cylinder 1. The width of the sorting trough 52 is the vertical distance between the surface of the sorting plate 5 and the outer wall of the cylinder 1.

[0021] Refer to the attached Figure 1 、the attached Figure 2 、the attached Figure 4As shown in the figure, end cap one 101 and end cap two 102 are respectively connected to both ends of cylinder 1. Magnetic system shaft 2 penetrates through end cap one 101 and is connected with adjustment arm 13. Magnetic system shaft 2 is rotationally connected to end cap one 101. Magnetic system shaft 2 independently drives main screen magnetic system 3 and pre-screen magnetic system 301 to rotate. Both main screen magnetic system 3 and pre-screen magnetic system 301 are composed of several alternating magnetic poles. Referring to the existing magnetic system structure, by pushing adjustment arm 13 to drive magnetic system shaft 2 to rotate, and then driving main screen magnetic system 3 and pre-screen magnetic system 301 to rotate to achieve the function of adjusting the angles of main screen magnetic system 3 and pre-screen magnetic system 301. In application, the angles of main screen magnetic system 3 and pre-screen magnetic system 301 can be adjusted according to the requirements of concentrate grade. The pre-screen magnetic systems 301 of magnetic separation device one 1000 and magnetic separation device two 1001 are both located on the side of cylinder 1 close to mixing tank 7. One end of magnetic system shaft 2 located inside cylinder 1 is rotationally sleeved with cylinder shaft 21. Cylinder shaft 21 penetrates through end cap two 102 and is fixedly connected to end cap two 102. Cylinder shaft 21 is connected to the rotating shaft of motor 12 through a transmission. Motor 12 is installed on frame 11. When in use, start motor 12. The rotating shaft of motor 12 adjusts the speed through the transmission. The output shaft of the transmission drives cylinder shaft 21 to rotate, and then drives cylinder 1 to rotate through end cap two 102. Since magnetic system shaft 2 is rotationally connected to cylinder shaft 21, the rotations of cylinder shaft 21 and magnetic system shaft 2 are independent of each other.

[0022] Please refer to Figure 1 , attached Figure 2 and attached Figure 5As shown in the figure, a flushing water pipe 41 is installed above the material box 4, and a discharge pipe 42 is connected to the side of the material box 4. The discharge pipe 42 is located on one side of the pre-screening magnetic system 301, and the discharge port of the discharge pipe 42 is perpendicular to the outer wall of the cylinder 1. A top cover 43 is installed at the top of the box groove 100 between the two material boxes 4 of the magnetic separation device 1000 and the magnetic separation device 1001. The top cover 43 is arc-shaped, and the lowest point of the top cover 43 is located on the symmetry axis of the magnetic separation device 1000 and the magnetic separation device 1001. The top cover 43 is located above the discharge pipe 42. Flushing pipes 44 are provided below both ends of the top cover 43. A spraying gap is formed between the discharge pipe 42 and the top cover 43, and the flushing pipes 44 are provided with water spray nozzles facing the spraying gap. During use, the flushing water pipe 41 sprays water into the material box 4. The water flow dilutes and flushes the pulp in the material box 4 into a suspended state and sprays it outward along the discharge pipe 42 onto the outer wall of the cylinder 1. The impact force causes the magnetic particles wrapped by non-magnetic particles in the pulp to be separated, which is beneficial to the screening of magnetic particles. Then the pulp flows downward along the outer wall of the cylinder 1. The magnetic ore particles in the pulp are adsorbed on the outer wall of the cylinder 1 under the action of the magnetic field force of the pre-screening magnetic system 301. By adjusting parameters such as the rotation speed of the cylinder 1 and the amount of pulp sprayed out from the discharge pipe 42, a speed difference is formed between the pulp sprayed on the outer wall of the cylinder 1 and the surface of the cylinder 1, so that the pulp can flow downward along the surface of the cylinder 1. During the process of the pulp flowing downward along the surface of the cylinder 1, the magnetic ore particles wrapped by non-magnetic ore particles hit the protrusions 10, further promoting the separation of magnetic ore particles and non-magnetic ore particles, which is beneficial to the adsorption of magnetic ore particles on the outer wall of the cylinder 1. The magnetic ore particles adsorbed on the surface of the cylinder 1 enter the sorting tank 52 with the rotation of the cylinder 1 for secondary screening; the pulp, non-magnetic ore particles, and some magnetic ore particles that are still not adsorbed on the outer wall of the cylinder 1 flow downward along the outer wall of the cylinder 1 and converge in the mixing tank 7 under the scraping of the scraping arc plate 6. The pulp in the mixing tank 7 will enter the sorting tank 52 through the feed tank 51 for secondary sorting after the gate 8 is opened.

[0023] During the process of the above-mentioned pulp being sprayed onto the outer wall of the cylinder 1 through the discharge pipe 42, the corresponding motor 12 is started to drive the rotation of the cylinders 1 of the first magnetic separation device 1000 and the second magnetic separation device 1001. The cylinder 1 of the first magnetic separation device 1000 rotates counterclockwise, and the cylinder 1 of the second magnetic separation device 1001 rotates clockwise. Due to the centrifugal force, some of the pulp on the outer walls of the two cylinders 1 detaches from the outer wall of the current cylinder 1 and is thrown out. The thrown-out pulp directly falls into the mixing tank 7 or adheres to the outer wall of the opposite cylinder 1 or adheres to the outer wall of the opposite discharge pipe 42 or adheres to the surface of the top cover 43. Under the action of the impact force, it further promotes the separation of non-magnetic particles and magnetic particles in the pulp, which is beneficial to the subsequent screening of magnetic particles. The water flow ejected from the water spray nozzle of the flushing pipe 44 contacts the outer walls of the discharge pipe 42 and the top cover 43 at the spraying gap and flows along the surfaces of the discharge pipe 42 and the top cover 43. The water flow on the surface of the discharge pipe 42 flows to the outer wall of the cylinder 1, and the water flow on the surface of the top cover 43 flows towards the lowest point in the middle of the top cover 43 and falls downward from the surface of the top cover 43 into the mixing tank 7. The pulp adhering to the outer wall of the opposite cylinder 1 flows downward together with the pulp on the outer wall of this cylinder 1 and adsorbs and screens the magnetic ore particles under the magnetic field action of the pre-screening magnetic system 301. The magnetic ore particles adsorbed on the outer wall of the cylinder 1 under the magnetic field force of the pre-screening magnetic system 301 rotate with the cylinder 1 to the sorting tank 52, and then undergo the main screening process under the action of the main screening magnetic system 3, and move to the concentrate hopper 55 as the cylinder 1 rotates. Under the flushing of the ore discharge water pipe 56, they fall off from the outer wall of the cylinder 1 and converge on the concentrate hopper 55 to become the selected ore.

[0024] In this application, to ensure that the speed of the pulp flowing out of the discharge pipe 42 along the outer wall of the cylinder 1 is greater than the linear speed of the rotation of the cylinder 1, so as to achieve the purpose of promoting the re-separation of magnetic ore particles and non-magnetic ore particles in the pulp when the pulp flows along the surface of the cylinder 1. The pulp and the cylinder satisfy the following formula: where ρ is the density of the pulp; is the gravity assumption degree; is the thickness of the pulp liquid film; is the dynamic viscosity of the pulp and the cylinder body; is the radius of the cylinder body; ω is the angular velocity of the cylinder rotation.

[0025] Refer to Appendix Figure 2 Appendix Figure 6 Appendix Figure 7As shown, when the pulp flowing downward along the outer wall of the cylinder 1 reaches the scraping arc plate 6, most of the pulp in the outer layer of the pulp flow on the outer wall of the cylinder 1 is blocked by the scraping arc plate 6 and flows downward along the surface of the scraping arc plate 6. The magnetic ore particles adsorbed on the outer wall of the cylinder 1 under the magnetic attraction of the pre-screen magnetic system 301 enter the sorting tank 52 from the gaps between the ore particles. The pulp scraped off by the scraping arc plate 6 flows downward along the outer walls of the scraping arc plate 6 and the tailings tank 53 and accumulates in the mixing tank 7. By scraping off the magnetic particle pulp with a small content of magnetic particles in the outer layer of the pulp flow or the magnetic particles wrapped by non-magnetic particles and not easily adsorbed on the surface of the cylinder 1 through the scraping arc plate 6, this part of the pulp enters the mixing tank 7 and flows to the sorting tank 52 through the feeding tank 51. The flow direction of the pulp in the sorting tank 52 is opposite to the rotation direction of the cylinder 1. The impact between the pulp and the surface of the cylinder 1 can further promote the separation of magnetic ore particles and non-magnetic ore particles, so as to achieve the beneficial effect of semi-countercurrent sorting. Thus, the secondary sorting of magnetic ore particles is realized. This is the main purpose of setting the scraping arc plate 6 in this application. If the scraping arc plate 6 is not set to scrape off the outer layer of pulp, the flow direction of the pulp in the sorting tank 52 is the same as the rotation direction of the cylinder 1, then there is no impact sorting effect of semi-countercurrent sorting. By setting the scraping arc plate 6, the sorting effect of magnetic particles in the pulp can be effectively improved, and the grade of the concentrate after sorting can be improved.

[0026] Refer to the attached Figure 1 , the attached Figure 2 , the attached Figure 3 , the attached Figure 5 and the attached Figure 8 As shown, control flow gate plates 8 are provided between the mixing tank 7 and the feeding tanks 51 of the first magnetic separation device 1000 and the second magnetic separation device 1001. The mixing tank 7 is enclosed by the tailings tanks 53 of the first magnetic separation device 1000 and the second magnetic separation device 1001, the scraping arc plate 6, and the control flow gate plates 8. By adjusting the angle of the control flow gate plates 8, the opening between the mixing tank 7 and the feeding tank 51 can be regulated, so as to control the flow of the pulp from the mixing tank 7 into the feeding tank 51. Refer to the attached Figure 2 , the attached Figure 3 , the attached Figure 5 and the attached Figure 8As shown in the figure, one end of the flow control gate plate 8 is connected with a plate shaft 81. The other end of the flow control gate plate 8 is rotationally and sealingly connected to the box groove 100 through a shaft rod. The plate shaft 81 is rotationally and sealingly connected to the box groove 100. Generally, the sealing between the plate shaft 81 and the box groove 100 is achieved through a sealing ring. A gear 82 is sleeved at the end of the plate shaft 81. Below the gear 82, there is a seat box 84 installed on the frame 11. A rack 83 is slidably connected inside the seat box 84. The gear 82 meshes with the rack 83. An electric telescopic rod 85 is installed inside the seat box 84. The driving end of the electric telescopic rod 85 is fixedly connected to the end of the rack 83. The gears 82 of the magnetic separation device one 1000 and the magnetic separation device two 1001 are meshed on the same rack 83. An axle seat 86 is sleeved on the outer periphery of the plate shaft 81. The axle seat 86 is installed on the outer wall of the seat box 84. The axle seat 86 plays a role in supporting and limiting the plate shaft 81. Taking the attachment Figure 8 shown as an example, when the driving end of the electric telescopic rod 85 extends and pushes the rack 83 to move forward, the two gears 82 drive their respective flow control gate plates 8 to rotate clockwise, so that the mixing tank 7 communicates with the feeding troughs 51 on both sides. The pulp in the mixing tank 7 flows into the feeding troughs 51 of the magnetic separation device one 1000 and the magnetic separation device two 1001.

[0027] Refer to the attachment Figure 2 and the attachment Figure 3 and the attachment Figure 5 and the attachment Figure 6 and the attachment Figure 7 shown, inclined water holes 501 are formed in the sorting plate 5. The inclined water holes 501 are inclined towards the inlet end side of the sorting tank 52. Refer to the cross-sectional view of the inclined water holes 501 in the attachment Figure 3 shown. The midline of the cross-section of the inclined water hole 501 is tangent to the outer wall of the cylinder 1. The water flow ejected from the inclined water holes 501 ejects the pulp in the sorting tank 52 towards the inlet end of the sorting tank 52 obliquely, slowing down the flow rate of the pulp in the sorting tank 52 towards the tailing tank 53, prolonging the residence time of the pulp in the sorting tank 52, increasing the probability that the magnetic ore particles adhere to the outer wall of the cylinder 1 under the magnetic attraction of the main sieve magnetic system 3, and improving the grade of the concentrated ore after screening. In addition, since the midline of the cross-section of the inclined water hole 501 is tangent to the outer wall of the cylinder 1, the water flow ejected from the inclined water holes 501 pushes the pulp in the sorting tank 52 towards the outer wall of the cylinder 1, shortening the distance between the magnetic ore particles in the pulp and the outer wall of the cylinder 1, which is beneficial to the adsorption of the magnetic ore particles on the outer wall of the cylinder 1 and further improving the grade of the concentrated ore.

[0028] Refer to the attachment Figure 2 and the attachment Figure 3 and the attachment Figure 5 and the attachment Figure 6 and the attachment Figure 7As shown in the figure, a jet mechanism 9 is provided in the box groove 100 at the sorting plate 5. The jet mechanism 9 is used to inject water flow into the inclined water holes 501. The jet mechanism 9 includes a water equalizing tank 91, a water pumping tank 92, a water storage tank 93, a first water inlet assembly 94 and a second water inlet assembly 95. Among them, the water equalizing tank 91 is arranged below the sorting plate 5. A water equalizing cavity is enclosed between the water equalizing tank 91 and the sorting plate 5. A water inlet check valve 911 is installed on the water equalizing tank 91; One water pumping tank 92 is arranged on each side below the water equalizing tank 91. The two water pumping tanks 92 and the water equalizing tank 91 respectively enclose two water pumping cavities. The two water pumping cavities are both connected to the water equalizing cavity through the water inlet check valve 911. A water pushing plate 921 is slidably connected inside each water pumping tank 92; The water storage tank 93 is arranged on the outer wall of the sorting plate 5 and the water pumping tank 92 and is located at the outlet end of the sorting tank 52. The top wall of the water storage tank 93 is smooth and arc-shaped and is tangent to the surface of the sorting plate 5. The pulp in the sorting tank 52 flows smoothly along the surface of the sorting plate 5 to the surface of the water storage tank 93 and then flows into the tailing tank 53. A water storage hole 931 is opened on the top wall of the water storage tank 93. The aperture of the water storage hole 931 is smaller than the diameter of the particles in the pulp. A water pumping check valve 932 is installed on the inner side wall of the water pumping tank 92. The inlet end of the water pumping check valve 932 is located at the bottom of the inner cavity of the water storage tank 93, and the outlet end of the water pumping check valve 932 is located at the top of the inner cavity of the water pumping tank 92, so that the outlet end of the water pumping check valve 932 is located above the water pushing plate 921. From the attached Figure 2 and attached Figure 3 It can be seen that the water storage tank 93 is located at the junction of the sorting tank 52 and the tailing tank 53. The pulp adsorbed with magnetic ore particles in the sorting tank 52 flows into the tailing tank 53 along the surfaces of the sorting plate 5 and the water storage tank 93. When the pulp passes through the surface of the water storage tank 93, part of the water in the pulp enters the inner cavity of the water storage tank 93 through the filtration of the water storage hole 931. Most of the pulp mixed with ore particles enters the tailing tank 53 through the surface of the water storage tank 93 and is discharged from the tailing pipe 54. The discharged pulp is the tailing. The bottom ends of the two water pushing plates 921 are respectively provided with a first water inlet assembly 94 and a second water inlet assembly 95. The first water inlet assembly 94 and the second water inlet assembly 95 are respectively used to push the water pushing plates 921 connected to them to move up and down in the corresponding water pumping tanks 92. The first water inlet assembly 94 includes an outer cover 941, a cam 942, a wheel shaft 943, a push rod 944, a cover 945, and a spring 946. The outer cover 941 is arranged in the space between the inner wall of the tailing tank 53 and the outer wall of the water pumping tank 92. The cam 942 is located inside the outer cover 941. The wheel shaft 943 is connected in the shaft hole of the cam 942. The push rod 944 passes through the bottom wall of the water pumping tank 92 and is connected to the bottom wall of the water pushing plate 921. The bottom end of the push rod 944 is connected to the cover 945. The cover 945 is in the shape of a bowl with an upward opening. A spring 946 is sleeved on the outer periphery of the push rod 944. The upper and lower ends of the spring 946 are respectively pressed against the outer wall of the water pumping tank 92 and the inner wall of the cover 945. Refer to the attached Figure 6 and attached Figure 7The structure of the water inlet assembly 2 95 is basically the same as that of the water inlet assembly 1 94, except that the cam 942 in the water inlet assembly 2 95 is arranged in a central symmetric state with the cam 942 in the water inlet assembly 1 94, but the two cams 942 in the water inlet assembly 1 94 and the water inlet assembly 2 95 are coaxial and share a wheel shaft 943. Therefore, when the long axis end of the cam 942 of the water inlet assembly 1 94 is downward, the long axis end of the cam 942 of the water inlet assembly 2 95 is upward, one end of the wheel shaft 943 is rotatably connected to the outer cover 941, and the other end of the wheel shaft 943 penetrates the tank 100 and is sleeved on the rotating bracket, which is installed on the frame 11, and the end of the wheel shaft 943 is drivingly connected to the output shaft of the speed regulator, and the input shaft of the speed regulator is drivingly connected to the barrel shaft 21, and the speed of the barrel shaft 21 is adjusted by the speed regulator and then transmitted to the wheel shaft 943, and the speed of the wheel shaft 943 is freely adjusted by the speed regulator.

[0029] When in use, water is introduced into the flushing water pipe 41, and the water flow sprayed from the flushing water pipe 41 dilutes the slurry in the material box 4. The diluted slurry is sprayed onto the outer wall of the cylinder 1 through the discharge pipe 42 and flows downward along the outer wall of the cylinder 1. The outer layer of slurry on the outer wall of the cylinder 1 is scraped off by the scraper arc plate 6 and flows downward along the scraper arc plate 6 and accumulates in the mixing tank 7 until the mixing tank 7 stores enough slurry to be transported to the feeding tanks 51 on both sides. Then the electric telescopic rod 85 is started to extend and push the two flow control gates 8 to rotate, and the mixing tank 7 is connected to the feeding tanks 51 on both sides. The material box 4 continuously sprays the ore liquid onto the outer wall of the cylinder 1 through the discharge pipe 42, and the ore liquid flows downward along the outer wall of the cylinder 1. Under the adsorption action of the pre-screening magnetic system 301, the preliminary screening of the magnetic ore particles is achieved. Moreover, since the slurry flows along the surface of the cylinder 1, the magnetic ore particles in the slurry are close to the outer wall of the cylinder 1, and the magnetic ore particles are easily adsorbed on the outer wall of the cylinder 1. When the slurry encounters the protrusion 10, a small eddy current is generated, which can cause the ore particles to flip, thereby realizing the function of stirring the ore particles and further increasing the probability of the magnetic ore particles being adsorbed on the outer wall of the cylinder 1.

[0030] Then, the motor 12 is started to drive the cylinder 1 to rotate, and the slurry in the mixing tank 7 enters the feed tank 51 of the magnetic separation device 1000 and the magnetic separation device 2 1001 respectively, and flows along the separation tank 52, the tailings tank 53, and the tailings pipe 54; in the separation tank 52, the adsorption function of the main screen magnetic system 3 on the ore particles realizes the adsorption and magnetic stirring functions of the magnetic ore particles, and the main screening operation of the magnetic ore particles is carried out. As the cylinder 1 rotates, the magnetic ore particles adsorbed on the outer wall of the cylinder 1 move upward to the concentrate hopper 55, and under the action of the cleaning water sprayed from the ore unloading water pipe 56, the magnetic ore particles are washed off the cylinder 1 and fall into the concentrate hopper 55, and then collected to become concentrate.

[0031] During the main screening operation of the above-mentioned magnetic ore particles, the continuously flowing downward pulp in the feed box 4 makes up for the pulp flowing out from the mixing tank 7 into the feed tank 51, realizing the continuous magnetic particle screening work of the first magnetic separation device 1000 and the second magnetic separation device 1001. By pre-screening magnetic particles in the area of the pre-screening magnetic system 301 and mainly screening magnetic particles in the area of the main-screening magnetic system 3, the double screening effectively improves the grade of the concentrate. At the same time, since the rotation of the cylinder shaft 21 drives the rotation of the wheel shaft 943, which in turn drives the rotation of the cams 942 of the first water inlet assembly 94 and the second water inlet assembly 95. When the long shaft end of the cam 942 of the first water inlet assembly 94 or the second water inlet assembly 95 rotates from top to bottom, a suction process is formed. During the suction process, the spring 946 squeezes the cover 945 downward, and the push rod 944 moves downward, thereby driving the water pushing plate 921 connected to the push rod 944 to move downward in the water pumping tank 92. Due to the negative pressure, the water in the water storage tank 93 enters the water pumping cavity above the water pushing plate 921 through the water pumping check valve 932. When the long shaft end of the cam 942 of the first water inlet assembly 94 or the second water inlet assembly 95 rotates from bottom to top, a pressing process is formed. During the pressing process, the edge of the cam 942 squeezes the cover 945 upward, the spring 946 is compressed, and the push rod 944 drives the water pushing plate 921 to move upward as the cover 945 moves upward, so as to push the water above the water pushing plate 921 into the water equalizing cavity above the water equalizing tank 91 through the water inlet check valve 911, and the water in the water equalizing cavity is sprayed into the sorting tank 52 through the inclined water holes 501. Since the cams 942 of the first water inlet assembly 94 and the second water inlet assembly 95 are arranged in a centrosymmetric state, when the long shaft end of the cam 942 of the first water inlet assembly 94 rotates from top to bottom, the long shaft end of the cam 942 of the second water inlet assembly 95 rotates from bottom to top; conversely, when the long shaft end of the cam 942 of the first water inlet assembly 94 rotates from bottom to top, the long shaft end of the cam 942 of the second water inlet assembly 95 rotates from top to bottom. That is to say, the suction process and the pressing process in the two water pumping tanks 92 are carried out alternately. When the suction process is carried out in the water pumping tank 92 corresponding to the first water inlet assembly 94 and the water in the water storage tank 93 is pumped into the water pumping cavity above the corresponding water pushing plate 921, the pressing process is carried out in the water pumping tank 92 corresponding to the second water inlet assembly 95, and the water in the water pumping cavity above the corresponding water pushing plate 921 is discharged into the water equalizing cavity through the water inlet check valve 911; conversely, when the pressing process is carried out in the water pumping tank 92 corresponding to the first water inlet assembly 94, the suction process is carried out in the water pumping tank 92 corresponding to the second water inlet assembly 95. Ensure that water continuously enters the water equalizing cavity of the water equalizing tank 91, and the water in the water equalizing cavity continuously sprays into the sorting tank 52 through the inclined water holes 501, ensuring that the pulp in the sorting tank 52 does not flow back into the water equalizing cavity of the water equalizing tank 91 through the inclined water holes 501.

[0032] See attached Figure 9As shown in the figure, the PLC control system of the magnetic separation device of the present application includes a concentration input module, a mineral particle size module, and a control unit. The input ends of the concentration input module and the mineral particle size input module are connected to the touch screen for writing data. The output ends of the concentration input module and the mineral particle size input module are connected to the input end of the control unit. The output end of the control unit is connected with a concentration speed regulation module, a mineral particle size speed regulation module, and a linkage speed regulation module. The output ends of the concentration speed regulation module, the mineral particle size speed regulation module, and the linkage speed regulation module are all connected to a cylinder speed regulation module and a wheel shaft speed regulation module. The output end of the cylinder speed regulation module is connected to a transmission, and the output shaft of the transmission is connected to the cylinder shaft 21. The output end of the wheel shaft speed regulation module is connected to a speed governor, and the output shaft of the speed governor is connected to the wheel shaft 943.

[0033] The above system includes three regulation methods, namely the concentration-cylinder-wheel shaft regulation mode, the mineral particle size-cylinder-wheel shaft regulation mode, and the concentration-mineral particle size-cylinder-wheel shaft regulation mode. The specific regulation process is as follows: Concentration-cylinder-wheel shaft regulation mode: Only write the pulp concentration value into the concentration input module. The pulp concentration value is transmitted to the control unit. The control unit activates the concentration speed regulation module. The concentration speed regulation module activates the cylinder speed regulation module and the wheel shaft speed regulation module. The cylinder speed regulation module adjusts the gear ratio of the transmission according to the pulp concentration value, thereby adjusting the rotation speed of the cylinder shaft 21. At the same time, the wheel shaft speed regulation module adjusts the gear ratio of the speed governor according to the pulp concentration value, thereby adjusting the rotation speed of the wheel shaft 943. Mineral particle size-cylinder-wheel shaft regulation mode: Only write the mineral particle size value into the mineral particle size input module. The mineral particle size is vertically transmitted to the control unit. The control unit activates the mineral particle size speed regulation module. The mineral particle size speed regulation module activates the cylinder speed regulation module and the wheel shaft speed regulation module. The cylinder speed regulation module adjusts the gear ratio of the transmission according to the mineral particle size value, thereby adjusting the rotation speed of the cylinder shaft 21. At the same time, the wheel shaft speed regulation module adjusts the gear ratio of the speed governor according to the mineral particle size value, thereby adjusting the rotation speed of the wheel shaft 943. Concentration-mineral particle size-cylinder-wheel shaft regulation mode: Write the pulp concentration value into the concentration input module and write the mineral particle size value into the mineral particle size input module. The pulp concentration value and the mineral particle size value are transmitted to the control unit. The control unit simultaneously activates the linkage speed regulation module. The linkage speed regulation module calculates the optimal values of the gear ratio of the transmission and the speed regulation ratio of the speed governor based on the two parameters of concentration and mineral particle size, and activates the cylinder speed regulation module and the wheel shaft speed regulation module to regulate the transmission and the speed governor respectively, thereby regulating the rotation speeds of the cylinder shaft 21 and the wheel shaft 943, so that the rotation speeds of the regulated cylinder shaft 21 and the wheel shaft 943 are both optimal values, maximizing the separation quality of magnetic mineral particles in the pulp.

[0034] The cylinder speed regulation module adjusts the speed ratio of the transmission according to the pulp concentration value, thereby adjusting the rotation speed of the cylinder shaft 21 to achieve the purpose of adjusting the rotation speed of the cylinder 1; at the same time, the axle speed regulation module adjusts the speed ratio of the speed governor according to the pulp concentration value, thereby adjusting the rotation speed of the axle 943 to achieve the purpose of adjusting the reciprocating movement speed of the water pushing plate 921.

[0035] Generally speaking, when the pulp concentration is high (>40%), it is necessary to reduce the rotation speed of the cylinder 1 to prevent the pulp from sticking and affecting the separation. At the same time, the water pressure of the inclined water holes 501 should be increased to increase the water flow impact force and improve the pulp fluidity; when the particle size of the minerals in the pulp is large, that is, the mineral particles are thick, the rotation speed of the cylinder 1 can be increased to enhance the centrifugal force to separate weakly magnetic impurities. At the same time, the water pressure of the inclined water holes 501 should be increased to improve the water flow impact force and enhance the separation effect between magnetic particles and non-magnetic particles; when the particle size of the minerals in the pulp is small, it is necessary to reduce the rotation speed of the cylinder 1 to avoid non-magnetic particles from being mixed in due to excessive centrifugal force. At the same time, the water pressure of the inclined water holes 501 should be reduced to reduce the water flow impact force and avoid magnetic particles from falling off the surface of the cylinder 1. The rotation speed of the cylinder 1 and the rotation speed of the axle 943 are related to the pulp concentration and the particle size of the minerals in the pulp. The correlation between the above parameters is obtained through experiments, and the correlation between the pulp concentration and the rotation speed of the cylinder 1 and the rotation speed of the axle 943 is stored in the concentration speed regulation module; the correlation between the particle size of the minerals and the rotation speed of the cylinder 1 and the rotation speed of the axle 943 is stored in the particle size of minerals speed regulation module, and the correlation between the pulp concentration, the particle size of the minerals and the rotation speed of the cylinder 1 and the rotation speed of the axle 943 is stored in the linkage speed regulation module.

[0036] Based on the structure of the jet mechanism 9 in the above magnetic separation device and the structure of the PLC control system of the magnetic separation device, it can be seen that in this application, the pulp filtered by the water storage holes 931 at the outlet end of the separation tank 52 is collected and re-sprayed into the separation tank 52, rather than an external water pump pumping clean water into the separation tank 52. On the one hand, the rotation of the axle 943 is related to the rotation of the cylinder 1, and a single-connected water pump cannot be well associated and adjusted with the rotation of the cylinder 1; on the other hand, the pulp concentration affects the screening effect of magnetic particles in the separation tank 52. Therefore, using the pulp at the outlet end of the separation tank 52 can minimize the impact on the pulp concentration in the separation tank 52, thereby improving the screening effect of magnetic particles in the pulp.

Claims

1. A semi-countercurrent magnetic separation device with double-machine linkage, characterized in that, It includes a magnetic separation device one (1000) and a magnetic separation device two (1001) with the same structure and symmetrically installed. Both the magnetic separation device one (1000) and the magnetic separation device two (1001) include a box trough (100). A cylinder (1) is rotatably installed in the box trough (100). A sorting plate (5) is provided below the cylinder (1). Oblique water holes (501) inclined towards the rotating side of the cylinder (1) are formed on the sorting plate (5). The center line of the cross-section of the oblique water holes (501) is tangent to the outer wall of the cylinder (1). A feed box (4) is provided above the cylinder (1). A pre-screening magnetic system (301) is arranged inside the cylinder (1). A mixing trough (7) is jointly communicated with the side of the two box troughs (100) close to each other. A jet mechanism (9) for pumping water to the oblique water holes (501) is arranged in the box trough (100).

2. The semi-countercurrent magnetic separation device with double-machine linkage according to claim 1, characterized in that Flushing water pipes (41) are installed above the two feed boxes (4). The outlet ends of the sides of the two feed boxes (4) close to each other are communicated with discharge pipes (42). A top cover (43) located between the two feed boxes (4) is installed at the top end of the box trough (100). The top cover (43) is arc-shaped and the top cover (43) is located above the discharge pipes (42). Flushing pipes (44) are provided below both ends of the top cover (43). A spraying gap is formed between the discharge pipes (42) and the top cover (43). Water spraying nozzles facing the spraying gap are arranged on the flushing pipes (44). Protrusions (10) are uniformly arranged on the outer wall of the cylinder (1).

3. The semi-countercurrent magnetic separation device with dual-machine linkage according to claim 1, wherein, The jet mechanism (9) includes a water equalizing trough (91), a water pumping trough (92), a water storage trough (93), a water inlet component one (94) and a water inlet component two (95). The water equalizing trough (91) is arranged below the sorting plate (5). A water inlet check valve (911) is installed on the water equalizing trough (91). A water pumping trough (92) is arranged on each side below the water equalizing trough (91). A water pushing plate (921) is slidably connected inside each water pumping trough (92). The water storage trough (93) is arranged on the outer wall of the sorting plate (5) and the water pumping trough (92) and is located at the outlet end of the sorting trough (52). The top wall of the water storage trough (93) is smooth and arc-shaped and is tangent to the surface of the sorting plate (5). A water storage hole (931) is formed on the top wall of the water storage trough (93). A water pumping check valve (932) is installed on the inner side wall of the water pumping trough (92). The inlet end of the water pumping check valve (932) is located at the bottom of the inner cavity of the water storage trough (93). The outlet end of the water pumping check valve (932) is located at the top of the inner cavity of the water pumping trough (92). The bottom ends of the two water pushing plates (921) are respectively provided with the water inlet component one (94) and the water inlet component two (95). The water inlet component one (94) and the water inlet component two (95) are respectively used to push the water pushing plates (921) connected to them to move up and down in the corresponding water pumping troughs (92).

4. The semi-countercurrent magnetic separation device with double-machine linkage according to claim 3, characterized in that, The water inlet assembly one (94) includes an outer cover (941), a cam (942), a wheel axle (943), a push rod (944), a cover (945), and a spring (946). The outer cover (941) is arranged below the water pumping tank (92). The cam (942) is located inside the outer cover (941). The wheel axle (943) is connected inside the shaft hole of the cam (942). The push rod (944) is connected to the bottom wall of the water pushing plate (921). The bottom end of the push rod (944) is connected to the cover (945). The cover (945) is in the shape of a bowl with an upward opening. The outer wall of the cover (945) is in contact with the outer wall of the cam (942). The outer circumference of the push rod (944) is sleeved with the spring (946). The two ends of the spring (946) are respectively pressed against the outer wall of the water pumping tank (92) and the inner wall of the cover (945). The cam (942) inside the water inlet assembly two (95) and the cam (942) inside the water inlet assembly one (94) are arranged in a centrosymmetric state and share the wheel axle (943).

5. The semi-countercurrent magnetic separation device with double-machine linkage according to claim 1, characterized in that, Flow control gate plates (8) are provided at both communication points on both sides of the mixing tank (7). One end of the flow control gate plate (8) is connected with a plate shaft (81). The other end of the flow control gate plate (8) is rotatably and sealingly connected to the box tank (100) through a shaft rod. The plate shaft (81) is rotatably and sealingly connected to the box tank (100). A gear (82) is sleeved at the end of the plate shaft (81). Below the gear (82), there is a seat box (84) installed on the frame (11). A rack (83) is slidably connected inside the seat box (84). The gear (82) meshes with the rack (83). An electric telescopic rod (85) is installed inside the seat box (84). The driving end of the electric telescopic rod (85) is fixedly connected to the end of the rack (83). The gears (82) of the magnetic separation device one (1000) and the magnetic separation device two (1001) are meshed on the same rack (83). A shaft seat (86) is sleeved on the outer circumference of the plate shaft (81). The shaft seat (86) is installed on the outer wall of the seat box (84).

6. The semi-countercurrent magnetic separation device with dual-machine linkage according to claim 1, characterized in that, A magnetic system shaft (2) is rotatably sleeved in the middle of the cylinder (1). Main screening magnetic systems (3) and pre-screening magnetic systems (301) are installed on both magnetic system shafts (2). Both the main screening magnetic systems (3) and the pre-screening magnetic systems (301) are composed of several alternately arranged magnetic poles. The pre-screening magnetic systems (301) are located on one side near the outlet end of the material box (4) inside the cylinder (1). End covers one (101) and end covers two (102) are respectively connected to both ends of the cylinder (1). The magnetic system shaft (2) penetrates through the end cover one (101) and is connected with an adjustment arm (13). The magnetic system shaft (2) is rotatably connected to the end cover one (101). One end of the magnetic system shaft (2) located inside the cylinder (1) is rotatably sleeved with a cylinder shaft (21). The cylinder shaft (21) penetrates through the end cover two (102) and is fixedly connected to the end cover two (102). The cylinder shaft (21) is connected to the rotating shaft of a motor (12) through a transmission. The motor (12) is installed on the frame (11).

7. The semi-countercurrent magnetic separation device with dual-machine linkage according to claim 1, characterized in that Inside the box chute (100), there are successively connected a feed chute (51), a sorting chute (52), a tailings chute (53) and a tailings pipe (54). The feed chute (51) is connected to a mixing chute (7). On the box chute (100), there is a concentrate hopper (55) located on the side of the cylinder (1). Above the concentrate hopper (55), a ore-discharging water pipe (56) is installed. At the top of the outer chute wall of the tailings chute (53), there is an arc-shaped scraping plate (6). The scraping plate (6) is tangent to the arc-shaped outer chute wall of the sorting plate (5). There is a particle gap formed between the scraping plate (6) and the cylinder (1). The width of the particle gap is between one-third and one-half of the width of the sorting chute (52).

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