A magnetic separator suitable for conveying materials on belts

Abstract

This utility model belongs to the field of material sorting technology, specifically disclosing an iron remover suitable for conveyor belts. It includes a fixed frame, a rotating shaft, a motor, a transmission mechanism, permanent magnets, a magnetic roller, a baffle, a scraper, and an iron receiving container. The fixed frame is located on the side of the receiving port away from the conveyor belt. The rotating shaft is mounted on the fixed frame, parallel to the axial direction of the tail roller of the conveyor belt. Multiple permanent magnets, all strip-shaped, are parallel to the rotating shaft and are distributed only on cylindrical surfaces coaxial with the rotating shaft, facing the material feeding side of the conveyor belt, and are fixed to the fixed frame. The magnetic roller is fixed to the rotating shaft and non-contactly sleeves the permanent magnets. A baffle is suspended above the magnetic roller, perpendicular to the conveyor belt direction. The scraper is fixed to the fixed frame below the magnetic roller, with its cutting edge parallel to the contact line between the magnetic roller and the rotating shaft. The motor is connected to the rotating shaft through the transmission mechanism. The iron receiving container is located below the scraper. This device solves the problem of continuous iron removal in traditional iron removers and can meet the iron removal requirements of high-load continuous production.

Description

Technical Field

[0001] This utility model belongs to the field of material sorting technology, and specifically discloses an iron remover suitable for conveying materials by belt. Background Technology

[0002] In industrial production, belt conveyors are key equipment for material transport, and magnetic separators are crucial devices for ensuring material purity and protecting downstream equipment. Disc magnetic separators were once commonly used on belt conveyors. Their working principle involves using an electromagnetic coil to generate a strong magnetic field; when material containing ferromagnetic impurities passes beneath it, the impurities are adsorbed onto the surface of the disc magnetic separator, achieving the purpose of iron removal. However, in long-term practical application, disc magnetic separators have revealed many drawbacks.

[0003] Space limitations: Disc separators are relatively large and complex in structure, requiring ample installation space and a sturdy foundation, which poses a challenge in production sites with limited space. For example, in the renovation projects of conveyor belts in some old factories, the narrow space cannot meet the installation requirements of disc separators, thus limiting their use.

[0004] Iron removal efficiency: The iron removal effect of a disc separator is greatly affected by factors such as material thickness and flow rate. When the material thickness is large, ferromagnetic impurities in the lower layer are difficult to be effectively adsorbed, resulting in incomplete iron removal. When the material flow rate is high, impurities may pass through before they can be adsorbed, reducing the iron removal efficiency.

[0005] Maintenance Costs: The structure of disc separators makes maintenance difficult. Internal components such as electromagnetic coils and transmission parts are prone to failure after long-term operation. Repairs require significant operating space, resulting in high costs and long cycles. For example, if the electromagnetic coil experiences a short circuit, the repair process is complex, requiring specialized technicians and considerable time, thus disrupting production continuity.

[0006] Operational stability: During operation, disc separators are significantly affected by environmental factors such as vibration and dust, which can easily lead to problems such as loose parts and poor contact, resulting in unstable operation and affecting the iron removal effect and equipment lifespan. In dusty environments, dust can easily enter the interior of the separator, accumulating on the electromagnetic coils and transmission components, accelerating component wear and reducing equipment performance.

[0007] In coal-fired power plants, coal is transported to the boiler via conveyor belts for combustion. Coal typically contains iron impurities such as rivets and nuts, which must be separated during transport. Conventional coal-fired power plants use disc separators or belt separators for this purpose. Once the disc separator is fully loaded with iron impurities, it moves to the belt conveyor via an upper sliding track to unload the iron. During this unloading process, the coal transported by the belt conveyor cannot undergo iron removal, resulting in some coal not being separated from iron impurities. These missed iron impurities can damage downstream equipment. Belt separators, on the other hand, require regular belt replacement due to constant wear, leading to significant maintenance workload. Furthermore, both disc and belt separators use electromagnets, resulting in high energy consumption.

[0008] In contrast, wheel-type magnetic separators have a more compact structural design, occupy less space, and are flexible in installation, making them suitable for belt conveyors with various spatial conditions. Their unique rotating structure makes the magnetic removal process more efficient, better adapting to different material thicknesses and flow rates, thus improving magnetic removal efficiency. However, with the expansion of industrial production scale, the increase in material conveying capacity, and the increasing demands for magnetic removal precision, wheel-type magnetic separators have gradually revealed insurmountable shortcomings.

[0009] Limited magnetic field coverage: The magnetic field of wheel-type iron separators is mainly concentrated on the surface of the wheel and a small area around it. For belt conveyors with large conveying capacity and thick material layers, ferromagnetic impurities located deep in the material or at the edge may not be adsorbed because they are outside the effective range of the magnetic field, resulting in incomplete iron removal and increasing the risk of downstream equipment failure due to impurity blockage and wear.

[0010] Insufficient continuous iron removal capacity: The impurity removal of wheel-type iron separators mainly relies on the scraping or unloading structure after the wheel rotates. When the material contains a lot of iron impurities, the surface of the wheel is easily covered by impurities quickly. If the cleaning is not timely, it will weaken the magnetic field adsorption capacity, and even cause impurities to fall back into the material. It cannot perform sorting while cleaning, making it difficult to meet the iron removal requirements of high-load continuous production. Utility Model Content

[0011] To address the technical problems listed in the background section, this utility model provides an iron remover suitable for conveyor belts transporting materials. The specific technical solution is as follows: A magnetic separator suitable for conveyor belts includes a fixed frame, a rotating shaft, a motor, a transmission mechanism, a permanent magnet, a magnetic roller, a baffle curtain, a scraper, and a receiving container. The fixed frame is fixed to the side of the receiving port away from the conveyor belt. The rotating shaft is mounted on the fixed frame via bearings, parallel to the axial direction of the tail roller of the conveyor belt. The permanent magnet is strip-shaped and parallel to the rotating shaft. Multiple permanent magnets are fixed on the fixed frame, distributed only on the cylindrical surface coaxial with the rotating shaft, facing the material feeding side of the conveyor belt. The magnetic roller is also coaxial with the rotating shaft, fixed to the rotating shaft, and sleeved around the permanent magnets, without contacting them. A baffle curtain, perpendicular to the conveyor belt's conveying direction, is suspended above the magnetic roller. The scraper is located below the magnetic roller, fixed to the fixed frame, with its cutting edge parallel to the contact line between the magnetic roller and the rotating shaft. The motor is connected to the rotating shaft via the transmission mechanism. The receiving container is located below the scraper, its position and space sufficient to receive scraped-off iron blocks.

[0012] Preferably, the outer surface of the magnetic roller is covered with adhesive of the same material as the tape of the tape machine.

[0013] This reduces the impact of the coal flow on the magnetic roller, and the iron blocks attached to the magnetic roller are less likely to slip.

[0014] Preferably, the magnetic roller is made of a non-magnetic material.

[0015] The purpose is to reduce the resistance when the magnetic roller rotates, reduce energy consumption, and at the same time prevent the roller itself from being magnetized, which would make it difficult for the scraper to remove the rollers attached to the cylinder wall.

[0016] Preferably, the scraper is tangent to the magnetic roller.

[0017] This design makes it easier to scrape off attached iron filings and prevents them from accumulating on the scraper.

[0018] Preferably, the permanent magnet is fixed to the bearing seat of the rotating shaft by radial spokes, and the angle of the radial spokes relative to the horizontal plane is adjustable.

[0019] This allows for appropriate adjustments based on the nature of the materials being transported and the position of the hopper, ensuring that the cylindrical surfaces of the permanent magnets are aligned directly with the scattering area.

[0020] Compared with the prior art, this utility model has the following advantages: This utility model provides an iron separator suitable for conveyor belts. By fixing a permanent magnet and rotating an iron-absorbing roller, it solves the problem of continuous iron removal by traditional disc and wheel iron separators. Its structure is simple, easy to adjust, and has a wide range of applications, which can meet the iron removal needs of high-load continuous production. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the iron remover structure applicable to conveyor belts in this embodiment of the present invention; In the figure: 1. Adhesive tape; 2. Tail roller of tape machine; 3. Head cover; 4. Head funnel (i.e., in the invention); 5. Fixing frame; 6. Rotary shaft; 7. Permanent magnet; 8. Magnetizing roller; 9. Scraper; 10. Motor; 11. Rubber curtain (i.e., curtain in the invention); 12. Iron discharge trolley (i.e., iron receiving container in the invention). Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] refer to Figure 1 This embodiment provides an iron separator for belt conveyors in a coal-fired power plant. Includes: head cover 3, fixing frame 5, rotating shaft 6, permanent magnet 7; magnetic roller 8, scraper 9, motor 10, rubber curtain 11, and iron discarding trolley 12.

[0024] The conveyor belt 1 is wound onto the tail roller 2 of the conveyor belt machine, and the rotation of the tail roller 2 drives the conveyor belt 1 forward. The head funnel 4 for receiving materials is bolted to the head cover 3, and includes the tail roller 2 and part of the magnetic roller 8. The fixed frame 5 and the head funnel 4 are both fixed to the floor slab. The rotating shaft 6 is connected to the fixed frame 5 through bearings. The permanent magnets 7 are distributed only on the cylindrical surface coaxial with the rotating shaft on the side facing the material feeding of the conveyor belt, and are connected to the fixed frame 5 through spokes. The magnetic roller 8 is driven by the rotating shaft 6. The scraper 9 is welded to the fixed frame 5. The motor 10 is fixed to the fixed frame 5. The rubber curtain 11 is bolted to the head cover 3; the scraper cart 12 is placed on the floor slab.

[0025] The coal, transported by conveyor belt 1, is delivered into the head funnel 4 and then thrown forward, landing on the surface of the magnetic roller 8. Iron substances in the coal are attracted to the surface of the magnetic roller 8 by the permanent magnet 7 and move out of the head funnel 4 as the magnetic roller 8 rotates. Here, the iron adhering to the magnetic roller 8 loses its attraction as it moves away from the permanent magnet 7 and eventually falls into the waste disposal cart 12 under the action of the scraper.

[0026] The head cover 3, the fixing frame 5, the rotating shaft 6, the magnetic roller 8, and the scraper 9 are all made of non-magnetic stainless steel.

[0027] The permanent magnets 7 are distributed on the side close to the coal flow and do not rotate with the magnet roller 8.

[0028] The surface of the magnetic roller 8 is covered with a layer of rubber to reduce the impact of the coal flow on the magnetic roller 8, and the magnet is attached to the magnetic roller 8 and does not easily slip.

[0029] When the rubber curtain 11 hangs down naturally, its end should be as close as possible to the magnetic roller 8, but not in contact with the magnetic roller 8.

[0030] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetic separator suitable for conveyor belts, characterized in that, The system includes a fixed frame, a rotating shaft, a motor, a transmission mechanism, permanent magnets, a magnetic roller, a baffle curtain, a scraper, and a receiving container. The fixed frame is positioned on the side of the conveyor belt away from the receiving port. The rotating shaft is mounted on the fixed frame via bearings, parallel to the axial direction of the tail roller of the conveyor belt. The permanent magnets are strip-shaped and parallel to the rotating shaft. Multiple permanent magnets are fixed on the fixed frame, distributed only on cylindrical surfaces coaxial with the rotating shaft, facing the material feeding side of the conveyor belt. The magnetic roller, also coaxial with the rotating shaft, is fixed to the shaft and surrounds the permanent magnets, without contacting them. A baffle curtain, perpendicular to the conveyor belt's conveying direction, hangs above the magnetic roller. The scraper is located below the magnetic roller, fixed to the fixed frame, with its blade edge parallel to the contact line between the magnetic roller and the rotating shaft. The motor is connected to the rotating shaft via the transmission mechanism. The receiving container is located below the scraper, its position and space sufficient to receive scraped iron blocks.

2. The iron remover suitable for conveyor belts according to claim 1, characterized in that, The outer surface of the magnetic roller is covered with adhesive of the same material as the tape used in the conveyor belt machine.

3. The iron remover suitable for conveyor belts according to claim 2, characterized in that, The magnetic roller is made of non-magnetic material.

4. A magnetic separator suitable for conveyor belts as described in claim 3, characterized in that, The scraper is tangent to the magnetic roller.

5. A magnetic separator suitable for conveyor belts as described in claim 4, characterized in that, The permanent magnet is fixed to the bearing housing of the rotating shaft by radial spokes, and the angle of the radial spokes relative to the horizontal plane is adjustable.

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