An eddy current sorter

Abstract

This utility model discloses an eddy current separator, including a support column and a support plate. A transmission belt device is installed inside the support plate, and a vibrating feeding mechanism is fixedly installed at the top front end of the support plate. A magnetic roller is installed inside the rear transmission roller of the transmission belt device, with the magnetic roller's shaft eccentrically positioned relative to the rear transmission roller's shaft. A positioning mechanism is installed on the outside of the support plate, with both ends of the magnetic roller's shaft rotatably mounted within the positioning mechanism. A magnetic roller drive motor is fixedly mounted on the positioning mechanism. A separation partition is fixedly installed at the top rear end of the support column, located behind the transmission belt device. A brush assembly is installed inside the support plate, located below the transmission belt device. The device also includes a controller and a variable frequency speed control system. This utility model, by employing a magnetic roller with an optimized magnetic pole arrangement and adjusting the eccentric position of the magnetic roller within the rear transmission roller, can flexibly change the starting point and intensity distribution of the separating force, making it suitable for materials of different particle sizes and shapes.

Description

Technical Field

[0001] This utility model belongs to the field of sorting machine technology, specifically an eddy current sorting machine. Background Technology

[0002] In practical applications, eddy current separation technology has achieved success in multiple industries. For example, in the field of scrap copper recycling, large domestic recycling companies (such as Jintian Copper and Jiangxi Copper) generally adopt a "pretreatment separation-smelting-electrolysis" process to process scrap copper. Physical methods such as eddy current separation are used to remove impurities and purify scrap copper raw materials, improving smelting efficiency and metal recovery rate. In the end-of-life vehicle dismantling industry, eddy current separators are used to recover non-ferrous metals such as copper and aluminum from vehicle waste, enabling the recycling of previously discarded metals and improving resource utilization. Furthermore, in electronic waste treatment, eddy current separation is combined with technologies such as magnetic separation and electrostatic separation to achieve efficient separation and recovery of multiple metals in electronic waste, providing key support for the development of "urban mining" resources.

[0003] Eddy current separators, with their advanced design principles and optimized structure, offer significant advantages in technical performance compared to traditional methods. They not only improve sorting efficiency and metal recovery rates but also bring substantial economic and environmental benefits. With my country's increasing emphasis on resource recycling and environmental protection, eddy current separation technology has a very promising future in fields such as waste metal recycling and municipal solid waste treatment.

[0004] Existing eddy current separators mostly use magnetic rollers and conveyor belt rollers coaxially arranged, such as the novel eddy current separator disclosed in Chinese Utility Model Patent No. CN213669850U and the eddy current separator disclosed in Chinese Utility Model Patent No. CN216995507U. In this type of eddy current separator, since the magnetic field distribution and intensity generated by the magnetic roller at the material separation starting position of the conveyor belt are fixed, it is difficult to adapt to the separation of particulate materials with different components, and the separation efficiency for small metal particles is not high. Utility Model Content

[0005] This utility model patent provides an eddy current separator. In terms of the magnetic system, it employs high-performance neodymium iron boron permanent magnet material and optimizes the magnetic pole arrangement, resulting in a higher magnetic field strength and a greater gradient on the surface of the magnetic roller. This generates a stronger eddy current repulsive force, improving the sorting ability for fine particles. By adjusting the eccentric position of the magnetic roller relative to the conveyor belt roller, the starting point and intensity distribution of the sorting force can be flexibly changed, which is particularly beneficial for improving the low sorting efficiency of traditional concentric separators for small metal particles.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An eddy current separator includes a support column and support plates fixedly disposed on both sides of the top of the support column. A transmission belt device is disposed inside the support plates. A vibrating feeding mechanism located above the transmission belt device is fixedly disposed at the top front end of the support plates. A magnetic roller is disposed inside the transmission roller at the rear end of the transmission belt device. A magnetic roller drive motor for driving the magnetic roller to rotate is disposed on the side of the support plates. The rotation shaft of the magnetic roller is eccentrically disposed with respect to the rotation shaft of the rear transmission roller. A separation partition located behind the transmission belt device is fixedly disposed at the top rear end of the support column. A brush assembly located below the transmission belt device is disposed inside the support plates. The separator also includes a controller and a variable frequency speed control system.

[0008] Furthermore, the magnetic roller includes a mandrel, an outer cylinder coaxially sleeved on the outside of the mandrel, and a permanent magnet cylinder sandwiched between the mandrel and the outer cylinder. The sidewall of the permanent magnet cylinder is formed by a number of uniformly distributed permanent magnet blocks arranged adjacent to each other in sequence, and the magnetic flux directions of two adjacent permanent magnet blocks are different.

[0009] Furthermore, the magnetic flux directions of two adjacent permanent magnet blocks are opposite, and both are distributed along the radial direction of the magnetic roller.

[0010] Furthermore, the magnetic flux directions of two adjacent permanent magnet blocks are perpendicular, the magnetic flux directions of two spaced-apart permanent magnet blocks are opposite, and the magnetic flux directions of two adjacent permanent magnet blocks are distributed along the radius of the magnetic roller and tangentially along the outer circle of the magnetic roller, respectively.

[0011] Furthermore, a positioning mechanism is provided on the outer side of the support plate, and the two ends of the rotating shaft of the magnetic roller are respectively rotatably disposed in the positioning mechanism. The magnetic roller drive motor is fixedly disposed on the positioning mechanism, and the output shaft end of the magnetic roller drive motor is connected to one end of the rotating shaft of the magnetic roller.

[0012] Furthermore, the positioning mechanism includes a rotating support fixedly connected to the outer surface of the support plate and located on both sides of the rotating shaft of the magnetic roller, a lead screw rotatably disposed in the rotating support, and a nut block threaded onto the outer side of the lead screw, with a positioning bearing seat fixedly connected between the two nut blocks.

[0013] Furthermore, the angle between the axis of the lead screw and the vertical direction is 30°~45°, and the central axis of the rear transmission roller of the transmission belt device is located in the central symmetry plane of the axes of the two lead screws.

[0014] Furthermore, the vibrating feeding mechanism includes two sets of guide columns fixedly installed on the top of the support plate, a support plate fixedly installed on the guide columns, a vibrating spring sleeved on the outside of the guide columns and located above the support plate, a vibrating trough fixedly connected to the top of the vibrating spring, and a vibrating motor fixedly installed on the bottom surface of the vibrating trough.

[0015] Furthermore, a camera bracket is fixedly installed on the side of the support plate, and a CCD camera is installed at the top of the camera bracket. The image capture direction of the CCD camera is vertically downward and located directly above the conveying device.

[0016] Furthermore, a protective cover is fixedly installed at the rear end of the support plate above the conveyor belt device. The controller and the variable frequency speed control system are respectively installed inside the protective cover. A touch screen electrically connected to the controller is also embedded in the side of the protective cover.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention employs high-performance neodymium iron boron permanent magnets and optimizes the magnetic pole arrangement in its magnetic system, resulting in a higher magnetic field strength and greater gradient on the surface of the magnetic roller. This generates stronger eddy current repulsion, improving the sorting ability for fine particles. By eccentrically setting the magnetic roller and the rear drive roller of the transmission belt device, it helps to overcome the problem of low sorting efficiency for small metal particles in traditional concentric separators. Practical applications show that the eccentric eddy current separator has a significantly better separation effect than traditional models for fine copper and aluminum particles smaller than 5mm.

[0019] This invention achieves the adjustment of the magnetic roller assembly position by setting a positioning mechanism, thereby realizing its eccentric position in the rear drive roller. It can flexibly change the starting point and intensity distribution of the sorting force, and is applicable to materials of different particle sizes and shapes (from metal fragments of a few millimeters to larger flakes), all of which can achieve good sorting results. The position-adjustable eccentric magnetic roller is particularly good at sorting fine particles that are difficult to handle by traditional equipment, thus expanding the application range of eddy current separation.

[0020] This invention utilizes a vibrating feeding mechanism to disperse and feed particulate materials. A CCD camera captures the material distribution on the conveyor belt, automatically adjusting the efficiency of the vibrating feeding mechanism to achieve optimal feeding volume and sorting effect. The conveyor belt device enables continuous material feeding, and a magnetic roller generates a high-frequency alternating magnetic field to achieve rapid sorting of conductive and non-conductive particles. This invention boasts a high degree of automation and saves manpower.

[0021] 4. The overall structure of this utility model is compact and occupies little space, making it easy to install in existing production lines or connect with crushing and screening equipment to realize a modular metal recycling process. Attached Figure Description

[0022] Figure 1 This is one of the three-dimensional structural schematic diagrams of the eddy current separator of this utility model;

[0023] Figure 2 This is the second three-dimensional structural schematic diagram of the eddy current separator of this utility model;

[0024] Figure 3 This is a cross-sectional structural schematic diagram of the eddy current separator of this utility model;

[0025] Figure 4 This is a three-dimensional schematic diagram of the crushing cylinder.

[0026] Figure 5 This is a schematic diagram of the half-body structure of the crushing cylinder;

[0027] Figure 6 This is a three-dimensional structural diagram of the crushing shaft;

[0028] Figure 7 This is one of the three-dimensional structural schematic diagrams of the spiral screening mechanism;

[0029] Figure 8 This is the second three-dimensional structural schematic diagram of the spiral screening mechanism.

[0030] In the diagram: 1. Support column; 2. Support plate; 3. Transmission belt device; 301. Rear transmission roller; 302. Conveyor belt; 4. Vibrating feeding mechanism; 401. Guide column; 402. Pallet; 403. Vibrating spring; 404. Vibrating trough; 405. Vibrating motor; 406. Infrared detector; 5. Magnetic roller; 501. Mandrel; 502. Outer cylinder; 503. Permanent magnet cylinder; 6. Separation partition; 7. Brush assembly; 701. Brush; 702. Drive motor;

[0031] 8. Magnetic roller drive motor; 9. Positioning mechanism; 901. Rotating support; 902. Lead screw; 903. Nut block; 904. Positioning bearing seat; 10. Protective cover; 11. Touch screen; 12. Three-color light alarm; 13. Camera bracket; 14. CCD camera; 15. Temperature detection module. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0033] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] This invention provides an eddy current separator, based on the same principle as existing eddy current separators, to separate metallic and non-metallic materials in mixed particulate materials. Specifically, its principle is based on two important physical phenomena: 1. A time-varying alternating magnetic field generates an alternating electric field (Faraday's law of electromagnetic induction); 2. A current-carrying conductor generates a magnetic field (Biot-Savart law). During eddy current separation, a high-speed rotating permanent magnet roller generates a high-frequency alternating magnetic field in the separation area. When conductive non-ferrous metal particles enter this magnetic field region, a closed loop current, i.e., eddy current, is induced inside the metal. According to Lenz's law, the magnetic field generated by the eddy current is opposite in direction to the original magnetic field, thus generating a repulsive force on the metal particles against the magnetic field of the roller. This Lorentz force (i.e., eddy current repulsion) pushes the conductive metal particles to jump along the conveying direction, causing their trajectories to deviate, thereby separating them from non-metallic particles that do not generate eddy currents. Therefore, eddy current separation essentially utilizes the difference in electrical conductivity of metals to induce different motion trajectories in different materials through electromagnetic induction, achieving the separation purpose.

[0036] See appendix Figures 1 to 3An eddy current separator includes a support column 1 and support plates 2 fixedly mounted on both sides of the top of the support column 1. A transmission belt device 3 is installed within the support plates 2, and a vibrating feeding mechanism 4 is fixedly mounted above the transmission belt device 3 at the top front end of the support plates 2. The support column 1 is welded from profiles and supports the entire equipment. The support plates 2 consist of two complete metal plates, front and rear, used for mounting the transmission belt device 3 and other functional components, and also serve as side baffles for the material conveying and sorting channels to prevent particle material spillage. A top plate structure is integrally mounted at the top front of the support plates 2 for mounting the vibrating feeding mechanism 4. The transmission belt device 3 uses a common synchronous belt conveyor driven by a frequency-adjustable motor. The equipment is equipped with a controller and a variable frequency speed control system to adjust the conveying speed of the transmission belt device 3 by modifying parameters. A protective cover 10 is fixedly installed at the rear end of the support plate 2, above the conveyor belt device 3. The controller and variable frequency speed control system are respectively housed inside the protective cover 10. A touch screen 11 electrically connected to the controller is also embedded in the side of the protective cover 10 for parameter input and display of working status data of various functional modules. Switches, emergency stop switches, and power indicator lights are provided on the side of the protective cover 10 for controlling the operation and displaying the status of the equipment. A three-color alarm 12 is installed at the top of the protective cover 10 to monitor the operating status of the equipment in real time. When a malfunction occurs, a buzzer alarm will be triggered so that personnel can quickly arrive at the scene to check. The controller uses a commercially available PLC programmable controller, and the variable frequency speed control system also uses commercially available equipment. All the above electrical components and their control and operation methods are existing technologies and will not be described in detail here.

[0037] like Figure 4 As shown, in this embodiment, the vibrating feeding mechanism 4 includes two sets of guide columns 401 fixedly mounted on the top of the support plate 2, a support plate 402 fixedly mounted on the guide columns 401, and a vibrating spring 403 sleeved on the outside of the guide columns 401 and located above the support plate 402. A vibrating trough 404 is fixedly connected to the top of the vibrating spring 403, and a vibrating motor 405 is fixedly mounted on the bottom surface of the vibrating trough 404. The vibrating trough 404 is inclined, with its discharge end inclined downward and located at the top front end of the conveyor belt 302 of the conveyor belt device 3. The granular material placed in the vibrating trough 404 is dispersed by vibration and falls onto the surface of the conveyor belt 302 through the discharge end, and is then continuously fed forward by the conveyor belt 302 to complete the subsequent sorting process. The vibrating motor 405 operates continuously, causing the vibrating trough 404 to vibrate continuously in conjunction with the vibrating spring 403, thereby achieving automatic dispersion and discharge of the granular material contained therein. By changing the vibration frequency and amplitude of the vibrating motor 405, the discharge rate of granular material per unit time can be adjusted accordingly. Uniform feeding and flat spreading help ensure that each particle is effectively exposed to the magnetic field, avoiding insufficient sorting of the bottom particles due to an excessively thick material layer.

[0038] Preferably, an infrared detector 406 is installed at the discharge port of the vibrating trough 404 to detect whether any material is being discharged from the vibrating trough 404. If the infrared detector 406 detects that no material is being discharged from the discharge port for a certain period of time (e.g., 5 seconds), it indicates that there is no material in the vibrating trough 404 and material needs to be added. The infrared detector 406 then transmits the detection result to the controller, which issues an alarm through the tri-color light alarm 12 and displays corresponding prompt information on the touch screen 11.

[0039] A camera bracket 13 is fixedly mounted on the side of the support plate 2, and a CCD camera 14 is mounted on the top of the camera bracket 13. The image capture direction of the CCD camera 14 is vertically downward and located directly above the conveying device 3 (specifically, the conveyor belt 302). The camera bracket 13 is used to acquire the distribution of the granular material conveyed on the conveyor belt 302 in real time to determine whether the working efficiency of the vibrating feeding mechanism 4 needs to be adjusted. Specifically, if the granular material on the conveyor belt 302 is too densely distributed, it is not conducive to the sorting effect, and the output of the vibrating feeding mechanism 4 needs to be reduced. At this time, the controller controls the vibrating motor 405 to reduce the vibration frequency and amplitude, thereby reducing the output. If the granular material on the conveyor belt 302 is too sparsely distributed, it is not conducive to the sorting efficiency, and the output of the vibrating feeding mechanism 4 needs to be increased. At this time, the controller controls the vibrating motor 405 to increase the vibration frequency and amplitude, thereby increasing the output. The position of the CCD camera 14 on the camera bracket 13 is adjustable to adjust the field of view of the CCD camera 14. For different materials and usage scenarios, a suitable field of view can be selected to obtain a better image capture effect.

[0040] A magnetic roller 5 is installed inside the rear transmission roller 301 of the transmission belt device 3. A magnetic roller drive motor 8, which drives the magnetic roller 5 to rotate, is installed on the side of the support plate 2. The rotating shaft of the magnetic roller 5 is concentric or eccentrically arranged with the rotating shaft of the rear transmission roller 301. The magnetic roller 5 is the core component of the sorting machine, and is composed of high-coercivity rare-earth permanent magnets (such as neodymium iron boron magnets) arranged with alternating N and N poles embedded in the roller. The magnetic roller 5 is driven by the magnetic roller drive motor 8 through a belt or direct drive, and can rotate at high speed to generate a high-frequency alternating magnetic field. Figure 5 As shown, this embodiment employs an eccentric magnetic roller structure, meaning that there is an eccentricity between the central axis of the magnetic roller 5 and the geometric center of the rotating shaft of the rear drive roller 301. The eccentric eddy current separation method is suitable for processing materials with small surface areas or lighter weights, and its separation effect is generally better than that of the concentric method, especially when processing difficult-to-separate materials.

[0041] A bearing seat is provided on the inner wall of the support plate 2. The end of the rear drive roller 301 is rotatably mounted in the bearing seat through the bearing, allowing it to rotate freely and realize the continuous rotation of the conveyor belt 302. A through hole is opened on the side wall of the support plate 2, located inside the bearing seat. The two ends of the rotating shaft of the magnetic roller 5 pass through the through hole and are rotatably mounted in the support plate 2 through the bearing, so as to realize the free rotation of the magnetic roller 5. The magnetic roller 5 rotates in the opposite direction to the rear drive roller 301 or rotates at a differential speed (the rotation speed of the magnetic roller 5 is greater than the rotation speed of the rear drive roller 301), so that the magnetic roller 5 can generate a high-frequency alternating magnetic field at the surface position of the conveyor belt 302. Preferably, the angle between the line connecting the center point of the rotating shaft of the magnetic roller 5 and the rotating shaft of the rear drive roller 301 and the vertical direction is 30°~45°, and the magnetic roller 5 is located at the top rear side of the rear drive roller 301, so that the granular material on the top surface of the conveyor belt 302 completes the magnetic induction process of conductive metal particles before being thrown off the top surface of the conveyor belt 302, and jumps along the conveying direction, thereby deviating from the running trajectory of non-conductive metal particles, and realizing the sorting process.

[0042] like Figure 3 As shown, a separation baffle 6 is fixedly installed at the top rear end of the support column 1, located behind the transmission belt device 3. By installing the separation baffle 6 behind the conveyor belt 302, metals and non-metals with different throwing distances can be separated and guided to their respective discharge channels, such as... Figure 5 As shown, the material falls into the discharge box (not shown in the figure) located below each discharge channel. Specifically, when the material passes through the high-speed rotating magnetic roller 5, the non-ferromagnetic conductors such as copper wires in it induce eddy currents in the alternating magnetic field and are subjected to repulsive forces, thus being "ejected" to a more distant position (such as...). Figure 5 The solid dots shown in the diagram); non-conductive plastics, silicon crystals, etc., are not subject to repulsive forces and fall to a closer position (such as...) at the end of the conveyor belt 302 due to inertia and gravity. Figure 5 (Hollow dots shown in the diagram). If the raw material contains ferromagnetic metals (such as iron nails or steel sheets), they should usually be removed by magnetic separation equipment (such as one located in the front half of the top of the transmission belt 302) before entering the eddy current separation position to prevent iron parts from being attracted to the magnetic roller 5 and affecting the separation. After one separation, non-ferrous metals such as copper and aluminum can be effectively separated from non-metallic impurities and enter their respective discharge bins. The separation baffle 6 is fixed to the support column 1 or support plate 2 by bolts, so that its position can be adjusted back and forth and up and down according to the material characteristics to achieve the best separation effect.

[0043] The magnetic roller 5 includes a spindle 501 (i.e., the rotating shaft of the magnetic roller 5), an outer cylinder 502 coaxially sleeved outside the spindle 501, and a permanent magnet cylinder 503 sandwiched between the spindle 501 and the outer cylinder 502. The sidewall of the permanent magnet cylinder 503 is composed of several uniformly distributed permanent magnet blocks arranged adjacent to each other, with adjacent permanent magnet blocks having different magnetic flux directions. Figure 6 As shown, in one embodiment, the magnetic flux directions of two adjacent permanent magnet blocks are opposite and are distributed along the radial direction of the magnetic roller. Thus, in the axial direction of the magnetic roller 5, the magnetic flux directions of the permanent magnet blocks in the same ring layer change alternately by rotating 180°. During the rotation, a high-frequency alternating magnetic field is generated in the area of ​​the corresponding ring layer position on the surface of the conveyor belt 302. The magnetic field alternation positions of each ring layer are spatially interleaved to form a magnetic field surface, which can fully cover the material spillage position on the top surface of the conveyor belt 302.

[0044] like Figure 7 As shown, in another embodiment, the magnetic flux directions of two adjacent permanent magnet blocks are perpendicular, and the magnetic flux directions of two spaced-apart permanent magnet blocks are opposite. Furthermore, the magnetic flux directions of two adjacent permanent magnet blocks are distributed along the radius of the magnetic roller and tangentially along its outer circumference. Thus, in the axial direction of the magnetic roller 5, the magnetic flux directions of the permanent magnet blocks within the same ring layer alternately change with a 90° rotation, forming a Halbach array, which effectively enhances the magnetic field strength.

[0045] A positioning mechanism 9 is provided on the outer side of the support plate 2. The two ends of the rotating shaft (core shaft 501) of the magnetic roller 5 are rotatably mounted within the positioning mechanism 9. The magnetic roller drive motor 8 is fixedly mounted on the positioning mechanism 9, and its output shaft is connected to one end of the rotating shaft of the magnetic roller 5. By adjusting the eccentric position of the magnetic roller 5, the distribution of the magnetic field on the surface of the conveyor belt 302 can be changed, thereby correspondingly changing the position of the material's "starting point" and optimizing the sorting effect for particles of different sizes. The eccentric design also effectively prevents magnetic impurities from being directly adsorbed onto the surface of the magnetic roller 5, protecting both the magnetic roller 5 and the conveyor belt 302.

[0046] Specifically, such as Figure 8As shown, the positioning mechanism 9 includes a rotating support 901 fixedly connected to the outer surface of the support plate 2 and located on both sides of the rotating shaft of the magnetic roller 5, a lead screw 902 rotatably disposed in the rotating support 901, and a nut block 903 threadedly sleeved on the outer side of the lead screw 902. A positioning bearing seat 904 is fixedly connected between the two nut blocks 903. The two ends of the rotating shaft (core shaft 501) of the magnetic roller 5 are rotatably mounted in the positioning bearing seat 904 through bearings. The magnetic roller drive motor 8 is fixedly mounted on the outer surface of one of the positioning bearing seats 904. By simultaneously adjusting the assembly position of the two positioning bearing seats 904 on the support plate 2, the position of the magnetic roller 5 in the rear transmission roller 301 can be adjusted, thereby adjusting the magnetic field distribution and intensity on the surface of the transmission belt 302 by adjusting the eccentricity. The axial direction of the lead screw 902 makes an angle of 30° to 45° with the vertical direction, that is, it is parallel to the line connecting the axis of the magnetic roller 5 and the axis of the rear drive roller 301, and the central axis of the rear drive roller 301 of the transmission belt device 3 is located within the central symmetry plane of the axes of the two lead screws 902. Thus, by rotating the lead screw 902, the two nut blocks 903 can be driven to move linearly along the axial direction of the lead screw 902, thereby adjusting the position of the positioning bearing seat 904. For this purpose, the through hole in the support plate 2 can be configured as an oblong hole along the axial direction of the lead screw 902.

[0047] A brush assembly 7 is installed inside the support plate 2, located below the transmission belt device 3. For example... Figure 2 As shown, the brush assembly 7 includes a brush 701 rotatably mounted below the bottom surface of the conveyor belt 302 and a brush drive motor 702 fixedly mounted on the outer side of the support plate 2. The output shaft end of the brush drive motor 702 is connected to the rotating shaft end of the brush 701. After the particulate material on the conveyor belt 302 is sorted as described above, some wet or sticky particles will adhere to the surface of the conveyor belt 302, making it difficult to achieve smooth scattering and separation. When the conveyor belt 302 carries these adhered materials to the bottom position, the continuously rotating brush 701 can clean the adhered materials in time to avoid adverse effects on the subsequent material sorting.

[0048] Meanwhile, this equipment also includes a temperature detection module 15 at the sorting position. This module uses temperature sensors to monitor the surface temperature of the magnetic roller 5, preventing demagnetization caused by the high temperature of the magnetic field damaging the atomic structure of the magnet's inner wall. Once the temperature sensor detects that the surface temperature of the magnetic roller 5 has reached a preset threshold, the controller triggers the equipment to stop. The equipment automatically restarts after the surface temperature of the magnetic roller 5 has decreased to a suitable level, ensuring safe and stable operation.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An eddy current sorter comprising a support column, support plates fixedly arranged on both sides of the top of the support column, characterized in that: The support plate is equipped with a transmission belt device. A vibrating feeding mechanism located above the transmission belt device is fixedly installed at the top front end of the support plate. A magnetic roller is installed in the transmission roller at the rear end of the transmission belt device. A magnetic roller drive motor for driving the magnetic roller to rotate is installed on the side of the support plate. The rotating shaft of the magnetic roller is eccentrically set with the rotating shaft of the rear transmission roller. A positioning mechanism is provided on the outer side of the support plate. The two ends of the rotating shaft of the magnetic roller are respectively rotatably disposed in the positioning mechanism. The magnetic roller drive motor is fixedly disposed on the positioning mechanism. The output shaft end of the magnetic roller drive motor is connected to one end of the rotating shaft of the magnetic roller. The top rear end of the support column is fixedly equipped with a separation partition located behind the transmission belt device. The support plate contains a brush assembly located below the transmission belt device, and also includes a controller and a variable frequency speed control system.

2. The eddy current sorter of claim 1, wherein: The magnetic roller includes a mandrel, an outer cylinder coaxially sleeved on the outside of the mandrel, and a permanent magnet cylinder sandwiched between the mandrel and the outer cylinder. The side wall of the permanent magnet cylinder is formed by a number of uniformly distributed permanent magnet blocks arranged adjacent to each other, and the magnetic flux directions of two adjacent permanent magnet blocks are different.

3. The eddy current sorter of claim 2, wherein: The magnetic flux directions of two adjacent permanent magnet blocks are opposite, and both are distributed along the radial direction of the magnetic roller.

4. The eddy current sorter of claim 2, wherein: The magnetic flux directions of two adjacent permanent magnet blocks are perpendicular, the magnetic flux directions of two spaced-apart permanent magnet blocks are opposite, and the magnetic flux directions of two adjacent permanent magnet blocks are distributed along the radius of the magnetic roller and along the outer tangential direction of the magnetic roller, respectively.

5. An eddy current sorter according to any one of claims 1 to 4, characterised in that: The positioning mechanism includes a rotating support fixedly connected to the outer surface of the support plate and located on both sides of the rotating shaft of the magnetic roller, a lead screw rotatably disposed in the rotating support, and a nut block threaded onto the outer side of the lead screw. A positioning bearing seat is fixedly connected between the two nut blocks.

6. The eddy current sorter of claim 5, wherein: The angle between the axis of the lead screw and the vertical direction is 30° to 45°, and the central axis of the rear transmission roller of the transmission belt device is located in the central symmetry plane of the axes of the two lead screws.

7. An eddy current sorter according to any one of claims 1 to 4 or 6 wherein: The vibrating feeding mechanism includes two sets of guide columns fixedly installed on the top of the support plate, a support plate fixedly installed on the guide columns, and a vibrating spring sleeved on the outside of the guide columns and located above the support plate. The top of the vibrating spring is fixedly connected to a vibrating trough, and a vibrating motor is fixedly installed on the bottom surface of the vibrating trough.

8. The eddy current sorter of claim 7, wherein: A camera bracket is fixedly mounted on the side of the support plate, and a CCD camera is mounted on the top of the camera bracket. The CCD camera's image capture direction is vertically downward and located directly above the conveying device.

9. The eddy current sorter of claim 8, wherein: The rear end of the support plate is fixedly equipped with a protective cover located above the conveyor belt device. The controller and the frequency conversion speed regulation system are respectively installed inside the protective cover. A touch screen electrically connected to the controller is also embedded in the side of the protective cover.

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