Iron removal device for crushed material

Abstract

The application relates to the technical field of iron removal of crushed materials, in particular to a crushed material iron removal device, which comprises a discharging mechanism with an adjustable opening degree of a discharging port for controlling the discharging rate of crushed materials; a shell comprising a cavity; a semi-magnetic iron removal device arranged in the cavity and comprising a magnetic roller, the magnetic direction of the magnetic roller being adjustable; and a flow guide mechanism obliquely arranged in the cavity, one end of the flow guide mechanism being communicated with the discharging port, and the other end extending to a working area of the magnetic roller, a plurality of flow distribution protrusions being arranged on the flow guide surface of the flow guide mechanism. The crushed material iron removal device provided by the application can ensure stable discharging, make the materials fully contact with the magnetic roller, and significantly improve the iron removal efficiency and quality by optimizing the magnetic direction and the material dispersion state, effectively remove the ferromagnetic impurities in the materials, and meet the requirements of different production scenes on the purity of the materials.

Description

Technical Field

[0001] This application relates to the field of iron removal technology for crushed materials, and more specifically, to an iron removal device for crushed materials. Background Technology

[0002] In the aluminum smelting industry, the waste recycling system in the anode assembly workshop is crucial to the stability and economy of the production process. The core function of this system is to efficiently crush and recycle the waste generated during production, thereby reducing production costs and improving resource utilization. However, existing iron removal processes have significant drawbacks, leading to large fluctuations in the iron content of the waste, which severely affects the quality of the anode carbon blocks.

[0003] In related technologies, the system uses a high-level silo in conjunction with a belt separator, but the material feeding relies on manual adjustment of the knife gate valve, which has significant drawbacks: firstly, the adjustment precision is insufficient, making it difficult to guarantee the uniformity of material feeding; secondly, it cannot respond to production needs in real time, leading to material spillage, waste, and environmental pollution. These problems not only increase maintenance costs but also restrict the iron removal effect, ultimately affecting the stability of aluminum electrolysis production. Therefore, it is urgent to optimize the iron removal process and improve the level of automation to ensure the efficient recovery and purity of crushed materials. Utility Model Content

[0004] To solve at least one of the above-mentioned technical problems, this application proposes a crushed material iron removal device.

[0005] In view of this, this application proposes a crushed material iron removal device, comprising: a feeding mechanism having an adjustable discharge port for controlling the discharge rate of the crushed material; a shell including a cavity; a semi-magnetic iron removal device disposed in the cavity, including a magnetic drum, the magnetic field line direction of the magnetic drum being adjustable; and a flow guiding mechanism inclinedly disposed in the cavity, one end of the flow guiding mechanism being connected to the discharge port and the other end extending to the working area of ​​the magnetic drum, the flow guiding surface of the flow guiding mechanism being provided with multiple flow diversion protrusions.

[0006] In some feasible embodiments, the magnetic roller includes: a non-magnetic outer cylinder, inside which is a rotatable permanent magnet assembly comprising multiple circumferentially arranged sector-shaped magnetic blocks; and a magnetic pole adjustment mechanism for controlling the rotation angle of the permanent magnet assembly relative to the non-magnetic outer cylinder.

[0007] In some feasible implementations, the magnetic pole adjustment mechanism includes: an angle positioner for detecting the rotation angle of the permanent magnet assembly; and a drive motor for driving the permanent magnet assembly to rotate relative to the non-magnetic outer cylinder.

[0008] In some feasible implementations, the angle between the direction of the magnetic field lines of the permanent magnet assembly and the tangential direction of the non-magnetic outer cylinder is 60° to 90°.

[0009] In some feasible implementations, the flow guiding mechanism is a spiral stepped flow guide plate with an inclination angle of 25° to 40°.

[0010] In some feasible implementations, the diversion protrusions are hemispherical or pyramidal in shape, with a height of 5 mm to 15 mm, and the spacing between adjacent diversion protrusions is 30 mm to 50 mm.

[0011] In some feasible implementations, the feeding mechanism includes: a feed hopper; a double-layer vibrating screen, inclined below the feed hopper, the upper screen being used to intercept large-sized impurities and the lower screen being used to screen crushed material of qualified particle size; a first guide channel connected to the discharge end of the upper screen for discharging the oversize material; and a second guide channel connected to the discharge end of the lower screen and connected to the upper end of the guide mechanism for uniformly conveying the undersize material to the iron removal station; wherein the vibration frequency of the double-layer vibrating screen is adjustable, and an adjustable flow control gate is provided at the outlet of the second guide channel.

[0012] In some feasible methods, the flow control gate is an electrically operated push-pull gate. The opening degree of the electrically operated push-pull gate is linked to the vibration frequency of the double-layer vibrating screen. When the vibration frequency increases, the opening degree of the electrically operated push-pull gate increases synchronously.

[0013] In some feasible embodiments, the bottom of the cavity is provided with an iron impurity collection tank and a non-ferrous material outlet. The iron impurity collection tank corresponds to the working area of ​​the magnetic drum, and a scraper-type chip removal mechanism is provided in the collection tank.

[0014] In some feasible embodiments, the crushed material iron removal device also includes an airflow assist device, located above the magnetic drum, for spraying compressed air onto the crushed material.

[0015] Compared with related technologies, this application has the following technical advantages:

[0016] The iron removal device for crushed materials provided in this application includes a feeding mechanism, a shell, a semi-magnetic iron removal device, and a flow guiding mechanism. It ensures stable discharge while allowing the material to fully contact the magnetic drum. By optimizing the direction of magnetic field lines and the material dispersion state, it significantly improves iron removal efficiency and quality, effectively removing ferromagnetic impurities from the material and meeting the purity requirements of different production scenarios.

[0017] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1A schematic diagram of the structure of a crushed material iron removal device according to one embodiment of this application is shown;

[0020] Figure 2 A schematic diagram of the structure of the crushed material iron removal device in another embodiment of this application is shown.

[0021] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0022] 100 Feeding mechanism, 102 Discharge port, 104 Feed hopper, 105 Double-layer vibrating screen, 106 First material guide channel, 108 Second material guide channel, 110 Shell, 112 Cavity, 120 Semi-magnetic iron removal device, 122 Magnetic drum, 130 Flow guiding mechanism, 140 Iron removal port, 142 Non-ferrous material outlet. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0025] The following reference Figure 1 and Figure 2 This application describes an iron removal device for crushed material according to some embodiments.

[0026] like Figure 1 and Figure 2 As shown, this application provides a crushed material iron removal device, including: a feeding mechanism 100 with an adjustable discharge port 102 for controlling the discharge rate of crushed material; a housing 110, which includes a cavity 112; a semi-magnetic iron removal device 120, disposed in the cavity 112, including a magnetic drum 122, the magnetic field line direction of the magnetic drum 122 being adjustable; and a flow guiding mechanism 130, inclinedly disposed in the cavity 112, one end of the flow guiding mechanism 130 communicating with the discharge port 102, and the other end extending to the working area of ​​the magnetic drum 122, with multiple diversion protrusions provided on the flow guiding surface of the flow guiding mechanism 130.

[0027] The iron removal device for crushed materials provided in this application includes a feeding mechanism 100, a housing 110, a semi-magnetic iron removal device 120, and a flow guiding mechanism 130. The feeding mechanism 100 has an adjustable discharge port 102, which can flexibly and accurately control the discharge rate of the crushed material according to actual production needs and material characteristics. The material flow rate entering the subsequent iron removal stage is stable and appropriate, avoiding insufficient iron removal due to excessive material flow rate, or waste of equipment resources and low production efficiency due to insufficient flow rate, thereby effectively improving the stability and efficiency of the entire iron removal process.

[0028] The magnetic field line direction of the magnetic drum 122 is adjustable, which allows the iron removal device to flexibly adjust the magnetic field line direction according to the characteristics of different crushed materials (such as particle size, shape, distribution and content of ferromagnetic substances, etc.) to optimize the iron removal effect.

[0029] The flow guiding mechanism 130 is inclinedly disposed in the cavity 112, with one end connected to the discharge port 102 and the other end extending to the working area of ​​the magnetic drum 122. It can evenly and smoothly guide the material discharged by the feeding mechanism 100 to the working area of ​​the magnetic drum 122, ensuring that the material can fully contact the magnetic drum 122 and improve the iron removal efficiency. At the same time, the inclined arrangement helps the material to flow naturally under its own gravity, reducing the accumulation and blockage of material during the conveying process, and ensuring the continuity and stability of the iron removal process.

[0030] The flow guiding mechanism 130 has multiple diversion protrusions on its flow guiding surface. These protrusions can divert the material, making the material flow in a more dispersed state during the flow guiding process. After the material is dispersed, the contact area with the magnetic roller 122 increases, and ferromagnetic substances are more easily adsorbed by the magnetic roller 122, thereby significantly improving the iron removal effect, reducing the residual amount of ferromagnetic substances in the material, and improving the quality of the final product.

[0031] The iron removal device for crushed materials provided in this application can ensure that the material is in full contact with the magnetic drum 122 while ensuring stable output. By optimizing the direction of magnetic field lines and the dispersion state of the material, it can significantly improve the iron removal efficiency and quality, effectively remove ferromagnetic impurities from the material, and meet the requirements of material purity in different production scenarios.

[0032] In some embodiments provided in this application, the magnetic roller 122 includes: a non-magnetic outer cylinder, inside which is a rotatable permanent magnet assembly, the permanent magnet assembly including a plurality of fan-shaped magnetic blocks arranged circumferentially; and a magnetic pole adjustment mechanism for controlling the rotation angle of the permanent magnet assembly relative to the non-magnetic outer cylinder.

[0033] In this embodiment, the magnetic roller 122 includes a non-magnetic outer cylinder and a permanent magnet combination magnetic pole adjustment mechanism. The permanent magnet group consists of multiple fan-shaped magnetic blocks arranged circumferentially, which allows the magnetic roller 122 to form a relatively uniform and adjustable magnetic field distribution. The non-magnetic outer cylinder can effectively isolate the magnetic field generated by the permanent magnet group, preventing the magnetic field from spreading outward and causing unnecessary interference to surrounding equipment and personnel. The magnetic pole adjustment mechanism can control the rotation angle of the permanent magnet group relative to the non-magnetic outer cylinder, thereby achieving flexible adjustment of the magnetic pole direction of the magnetic roller 122.

[0034] Through the rational structure of the permanent magnet assembly, the protective function of the non-magnetic outer cylinder, and the flexible adjustment of the magnetic pole adjustment mechanism, this magnetic drum 122 can achieve efficient and precise iron removal during the crushing process. It can quickly and effectively adsorb ferromagnetic impurities in materials, reduce the content of ferromagnetic substances in the materials, and improve the purity and quality of the product.

[0035] In some embodiments provided in this application, the magnetic pole adjustment mechanism includes: an angle positioner for detecting the rotation angle of the permanent magnet assembly; and a drive motor for driving the permanent magnet assembly to rotate relative to the non-magnetic outer cylinder.

[0036] In this embodiment, the magnetic pole adjustment mechanism includes an angle positioner and a drive motor. The angle positioner can detect the rotation angle of the permanent magnet assembly relative to the non-magnetic outer cylinder in real time and with high precision. This ensures that the magnetic pole adjustment mechanism can accurately adjust the permanent magnet assembly to a predetermined angular position according to actual needs, thereby achieving precise control of the magnetic field direction. The drive motor provides a reliable driving force for the rotation of the permanent magnet assembly. The drive motor can precisely control the rotation speed and direction of the permanent magnet assembly according to the instructions of the control system, ensuring that the magnetic pole adjustment process is smooth and accurate. The coordinated operation of the angle positioner and the drive motor enables the magnetic pole adjustment mechanism to achieve intelligent adjustment of the magnetic field direction.

[0037] In some embodiments provided in this application, the angle between the magnetic field lines of the permanent magnet assembly and the tangential direction of the non-magnetic outer cylinder is 60° to 90°.

[0038] In this embodiment, the angle between the magnetic field lines of the permanent magnet assembly and the tangent of the non-magnetic outer cylinder is within the range of 60° to 90°. This allows the magnetic field generated by the permanent magnet assembly to form a reasonable angle with the surface of the non-magnetic outer cylinder, enhancing the magnetic field's adsorption of ferromagnetic substances in the material. The vertical adsorption force is greatest at 90°, while the 60°-90° range can accommodate different material characteristics and flow states. This ensures smooth material passage through the outer cylinder while effectively improving iron removal efficiency and reducing residual ferromagnetic impurities in the material, thus improving product quality. Furthermore, the structure is simple and easy to implement, facilitating stable equipment operation.

[0039] In some embodiments provided in this application, the flow guiding mechanism 130 is a spiral stepped flow guiding plate with an inclination angle of 25° to 40°.

[0040] In this embodiment, the flow guiding mechanism 130 is a spiral stepped guide plate with an inclination angle of 25°-40°. Within this range, the inclination angle allows the material to flow smoothly and steadily along the guide plate using its own weight, preventing accumulation and blockage, and ensuring continuous iron removal. The spiral stepped structure increases the material's travel distance and residence time during the flow guiding process, allowing for thorough material dispersion, increasing the contact area with the magnetic drum 122, and enhancing the iron removal effect. Simultaneously, this inclination angle, combined with the spiral stepped guide plate, can adapt to materials of different particle sizes and flow rates, improving the device's versatility and ensuring efficient and stable iron removal operations.

[0041] In some embodiments provided in this application, the diversion protrusion is hemispherical or pyramidal, with a height of 5mm to 15mm, and the spacing between adjacent diversion protrusions is 30mm to 50mm.

[0042] In this embodiment, the hemispherical or pyramidal protrusions effectively disperse the material, preventing it from clumping together, increasing the contact area between the material and the magnetic roller 122, and improving iron removal efficiency. A height of 5mm-15mm ensures smooth flow without obstructing material flow. A spacing of 30mm-50mm is appropriately set, guaranteeing both effective diversion and avoiding either excessively small spacing that increases material flow resistance or excessively large spacing that leads to insufficient diversion, enabling the device to remove iron stably and efficiently under different operating conditions.

[0043] like Figure 1 As shown, in some embodiments provided in this application, the feeding mechanism 100 includes: a feeding hopper 104; a double-layer vibrating screen 105, inclinedly disposed below the feeding hopper 104, the upper screen being used to intercept large-sized impurities, and the lower screen being used to screen crushed material of qualified particle size; a first guiding channel 106, connected to the discharge end of the upper screen, for discharging the material on the screen; and a second guiding channel 108, connected to the discharge end of the lower screen and connected to the upper end of the guiding mechanism 130, for uniformly conveying the material undersize to the iron removal station; wherein, the vibration frequency of the double-layer vibrating screen 105 is adjustable, and an adjustable flow control gate is provided at the outlet of the second guiding channel 108.

[0044] In this embodiment, the feeding mechanism 100 includes a feed hopper 104, a double-layer vibrating screen 105, a first guide channel 106, and a second guide channel 108. The double-layer vibrating screen 105 is inclined, with the upper screen intercepting large impurities and the lower screen screening qualified crushed material, purifying the material at the source, reducing the burden of subsequent iron removal, and improving iron removal efficiency and product quality. The first guide channel 106 is connected to the discharge end of the upper screen, enabling timely discharge of large impurities to prevent their accumulation within the mechanism and ensure continuous production. The second guide channel 108 evenly transports qualified crushed material to the iron removal station, ensuring uniform material distribution and facilitating subsequent iron removal operations. The adjustable vibration frequency of the double-layer vibrating screen 105 allows for flexible adjustment according to material characteristics, improving screening efficiency; the flow control gate adjusts the outlet flow of the second guide channel 108, adapting to different production needs and enhancing the versatility and flexibility of the device.

[0045] In some embodiments provided in this application, the flow control gate is an electrically operated push-pull gate. The opening degree of the electrically operated push-pull gate is linked to the vibration frequency of the double-layer vibrating screen 105. When the vibration frequency increases, the opening degree of the electrically operated push-pull gate increases synchronously.

[0046] In this embodiment, the opening of the electrically operated push-pull gate is linked to the vibration frequency of the double-layer vibrating screen 105. An increase in the vibration frequency of the double-layer vibrating screen 105 indicates a faster screening speed. Simultaneously, the opening of the electrically operated push-pull gate increases, allowing more qualified material to pass through promptly, preventing material accumulation in the second guide channel 108, ensuring smooth material transport, and stabilizing the material flow throughout the entire feeding and iron removal process. This stable flow ensures uniform material distribution at the iron removal station, enhancing the adsorption effect of the magnetic drum 122 on ferromagnetic substances, and improving iron removal efficiency and product purity.

[0047] like Figure 1 As shown, in some embodiments provided in this application, the bottom of the cavity 112 is provided with an iron impurity collection tank and a non-ferrous material outlet 142. The iron impurity collection tank corresponds to the working area of ​​the magnetic drum 122, and a scraper-type chip removal mechanism is provided in the collection tank.

[0048] In this embodiment, the iron impurity collection tank corresponds to the working area of ​​the magnetic drum 122, enabling precise collection of iron impurities adsorbed by the magnetic drum 122, preventing them from being mixed with non-ferrous materials again, and improving the purity of iron removal. A scraper-type chip removal mechanism can promptly discharge iron impurities from the collection tank, preventing impurity accumulation from affecting the collection effect and equipment operation. A non-ferrous material outlet 142 is independently provided to ensure the smooth discharge of qualified materials, achieving effective separation of iron impurities and non-ferrous materials. This improves iron removal efficiency and quality, ensures production continuity, reduces the workload of manual impurity cleaning, lowers labor intensity, and enhances equipment automation and reliability. An iron removal port 140 is also provided at the bottom of the cavity 112 for discharging iron impurities.

[0049] In some embodiments provided in this application, the crushed material iron removal device further includes: an airflow auxiliary device, disposed above the magnetic drum 122, for spraying compressed air onto the crushed material.

[0050] In this embodiment, the iron removal device for crushed material also includes an airflow auxiliary device. The airflow auxiliary device, positioned above the magnetic drum 122, sprays compressed air to disperse the crushed material, distributing it more evenly around the magnetic drum 122. This increases the probability of iron impurities contacting the magnetic drum 122, improving iron removal efficiency and effectiveness. Simultaneously, the airflow can peel away non-ferrous materials adhering to the iron impurities, allowing for purer collection of the iron impurities. Furthermore, the compressed air can promptly clean dust and fine iron filings adsorbed on the surface of the magnetic drum 122, preventing accumulation that could affect adsorption performance, ensuring long-term stable operation of the equipment, reducing manual cleaning and maintenance costs, and improving production continuity.

[0051] In specific embodiments, such as Figure 1 and Figure 2 As shown, the iron removal device for crushed material provided in this application can achieve uniform feeding by controlling the discharge speed and the opening of the discharge port 102, ensuring that the material is evenly distributed on the iron separator and avoiding material accumulation and incomplete local iron removal. Through extensive experiments and research, the semi-magnetic iron removal equipment (magnetic field strength optimized from 2400Gs to 10000Gs) of the iron removal belt in the high-level silo of the crushed material return system was upgraded. The 10000Gs semi-magnetic iron removal equipment has a stronger magnetic field strength, enabling more effective adsorption of iron impurities in the crushed material. Simultaneously, through experiments adjusting the direction of the magnetic lines of force of the strong magnetic drum 122, it was found that the iron removal effect is most ideal when the angle of the magnetic field lines is within the range of 60°-90°. In practical applications, by adjusting the installation angle and internal magnetic field structure of the strong magnetic drum 122, the direction of the magnetic field lines is placed within the optimal angle range, further enhancing the iron removal effect. This optimized iron removal equipment, combined with uniform feeding, forms a complete iron removal system for crushed materials, which can significantly improve iron removal efficiency and reduce the iron content in crushed materials.

[0052] The specific process for iron removal is as follows:

[0053] The crushed material in the hopper enters the double-layer vibrating screen 105 through the feed inlet (flexible connection). After the double-layer vibrating screen 105 is started, the material is screened through the φ20mm screen holes.

[0054] Materials screened through a 20mm sieve are divided into two categories: materials larger than 20mm pass through the large material outlet into the on-site collection hopper and are returned to the process for secondary crushing; materials smaller than 20mm pass through the powder outlet flexible connection and the iron separator inlet into the iron separator.

[0055] The iron separator rotates under the drive of the motor. The material entering the iron separator is subjected to the action of the 10000Gs strong magnetic automatic iron removal device, which removes iron impurities from the crushed material.

[0056] After the iron impurities are removed, the material is fed into the electrolytic cell by a trolley through the iron remover outlet 102, while the iron impurities are discharged and piled up through the iron removal outlet 140.

[0057] In terms of iron removal efficiency, the introduction of a 10,000 Gs semi-magnetic iron removal device and optimization of its magnetic field line direction significantly reduced the iron content of the crushed material. During the experimental phase, multiple tests and data comparisons revealed that the average iron content of the crushed material decreased from 0.21% to an average of 0.11%. This significant change not only greatly improved the quality of the crushed material but also provided higher-quality raw materials for subsequent aluminum electrolysis production. During aluminum electrolysis, the reduced iron content in the crushed material improved the conductivity and stability of the electrolytic aluminum liquid, increased current efficiency, and correspondingly reduced energy consumption.

[0058] From the perspective of its impact on product quality, reducing the iron content of the crushed material is of great significance for improving the quality of electrolytic aluminum products. The reduction of iron impurities significantly decreases the formation of intermetallic compounds in the molten aluminum, thereby increasing the purity of the aluminum product. Testing has shown that using the improved crushed material in production results in a significant increase in the purity of the aluminum product, more stable product quality, and compliance with higher market standards, thus enhancing the product's market competitiveness and bringing greater economic benefits to the enterprise. Furthermore, the more uniform material feeding reduces material spillage, lowering production costs, improving the production environment, reducing cleaning and maintenance workload, and increasing the overall efficiency of the workshop.

[0059] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A crushed material iron removal device, characterized in that, include: The feeding mechanism has an adjustable discharge port to control the discharge rate of the crushed material; Housing, the housing including a cavity; A semi-magnetic iron removal device is disposed in the cavity and includes a magnetic roller, the direction of the magnetic field lines of the magnetic roller being adjustable; A flow guiding mechanism is inclinedly disposed in the cavity. One end of the flow guiding mechanism is connected to the discharge port, and the other end extends to the working area of ​​the magnetic roller. Multiple flow diversion protrusions are provided on the flow guiding surface of the flow guiding mechanism.

2. The iron removal device for crushed material according to claim 1, characterized in that, The magnetic roller includes: A non-magnetic outer cylinder, wherein a rotatable permanent magnet assembly is provided inside the non-magnetic outer cylinder, the permanent magnet assembly comprising a plurality of fan-shaped magnetic blocks arranged circumferentially; A magnetic pole adjustment mechanism is used to control the rotation angle of the permanent magnet assembly relative to the non-magnetic outer cylinder.

3. The iron removal device for crushed material according to claim 2, characterized in that, The magnetic pole adjustment mechanism includes: An angle locator is used to detect the rotation angle of the permanent magnet assembly; A drive motor is used to drive the permanent magnet assembly to rotate relative to the non-magnetic outer cylinder.

4. The iron removal device for crushed material according to claim 3, characterized in that, The angle between the magnetic field lines of the permanent magnet assembly and the tangent of the non-magnetic outer cylinder is 60° to 90°.

5. The iron removal device for crushed material according to claim 1, characterized in that, The flow guiding mechanism is a spiral stepped flow guide plate with an inclination angle of 25° to 40°.

6. The iron removal device for crushed material according to claim 1, characterized in that, The diversion protrusion is hemispherical or pyramidal in shape, with a height of 5mm to 15mm, and the distance between adjacent diversion protrusions is 30mm to 50mm.

7. The iron removal device for crushed material according to any one of claims 1 to 6, characterized in that, The feeding mechanism includes: Feed hopper; A double-layer vibrating screen is inclinedly set below the feed hopper. The upper screen is used to intercept large-sized impurities, and the lower screen is used to screen crushed materials of qualified particle size. The first material guide channel is connected to the discharge end of the upper screen and is used to discharge the material on the screen. The second material guiding channel is connected to the discharge end of the lower screen and to the upper end of the guiding mechanism, and is used to uniformly transport the screened material to the iron removal station. The vibration frequency of the double-layer vibrating screen is adjustable, and an adjustable flow control gate is provided at the outlet of the second material guide channel.

8. The iron removal device for crushed material according to claim 7, characterized in that, The flow control gate is an electrically operated push-pull gate. The opening degree of the electrically operated push-pull gate is linked to the vibration frequency of the double-layer vibrating screen. When the vibration frequency increases, the opening degree of the electrically operated push-pull gate increases synchronously.

9. The iron removal device for crushed material according to any one of claims 1 to 6, characterized in that, The bottom of the cavity is provided with an iron impurity collection tank and a non-ferrous material outlet. The iron impurity collection tank corresponds to the working area of ​​the magnetic drum, and a scraper-type chip removal mechanism is provided in the collection tank.

10. The iron removal device for crushed material according to any one of claims 1 to 6, characterized in that, Also includes: An airflow assist device, located above the magnetic drum, is used to spray compressed air onto the crushed material.

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