A variable magnetic separation device for solid ferromagnetic domestic waste materials

Abstract

The present invention provides a variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials, which includes a support, a magnetic separation component, a mounting flange, a power input shaft, a magnetic separation drum and a magnetic force reversing rod. The magnetic separation component further comprises a connecting shaft, a bar magnet, a magnetic force reversing rudder, a self-lubricating bearing, a key, a return spring and a positioning steel ball. When the magnetic separation device works, the magnetic force reversing rod makes the magnetic separation component rotate by touching the rudder handle, and under the cooperation of the return spring, the positioning steel ball and the positioning hole, the magnetic field direction of the bar magnet rotates by 90°. The ferromagnetic waste materials lose magnetism due to the 90° rotation of the magnetic force direction and fall under the action of gravity, thereby realizing the separation of solid ferromagnetic domestic waste materials. The present invention avoids the damage of the existing magnetic scraping of magnetic waste from a strong magnetic field and ferromagnetic waste materials to the incinerator, reduces energy consumption and waste treatment costs, prolongs the service life and trouble-free working time of waste treatment equipment, and improves the incineration efficiency of solid domestic waste, the service life of magnetic separation equipment and incinerators.

Description

Technical Field

[0001] The present invention relates to a variable magnetic magnetic separation device for solid domestic waste materials, and particularly to a variable magnetic magnetic separation device, which is mainly used for the pretreatment of magnetic waste materials in solid waste, can prevent magnetic waste materials from damaging the incinerator during the incineration process, save energy and improve the service life of the magnetic separation device. Technical Background

[0002] The solid waste generated by people in daily life has complex components, various types, and different sizes. If not treated in time, it will greatly pollute the environment, endanger human health, and at the same time occupy and pollute a large amount of land resources. The existing treatment methods for solid domestic waste mainly include sanitary landfill, composting, and incineration. At present, the sanitary landfill treatment method accounts for about 78% of the domestic waste treatment volume; composting utilization is still difficult to form an effective recycling due to the lack of strong classification of domestic waste; incineration can greatly reduce the volume and weight of waste and can generate clean electric energy through reuse, so it has become a popular and favored treatment method due to the prominent waste problem in recent years. Since there are often magnetic wastes such as scrap iron in domestic waste, this type of waste is not suitable for sanitary landfill and composting utilization, nor is it suitable for incineration treatment, mainly because it will cause serious damage to the incinerator during the incineration process. Therefore, this type of ferromagnetic waste material must be screened and separated before waste treatment, which can not only improve the treatment efficiency of subsequent non-magnetic waste materials, but also recycle waste iron resources for reuse, saving energy and protecting the environment.

[0003] The working principle of the garbage classification magnetic separation device is to use magnetic force to absorb and screen out ferromagnetic waste materials in solid domestic waste. Existing magnetic separation equipment generally uses permanent magnets to screen, mechanically scrape and separate, and recover ferromagnetic waste materials through the suction of a constant magnetic field (non-magnetic materials are not disturbed by the magnetic field). However, since the permanent magnet is a constant magnetic field and its magnetic field intensity always changes, the magnetic materials selected by magnetic separation can only be separated from the magnetic field (i.e., separated from the magnetic separation drum) under the strong mechanical action of the scraper. Therefore, the defect of the current screening and separation method is that the scraper is subjected to huge mechanical impacts, is easily damaged, wastes energy, the separation and recovery are difficult and incomplete, and it will cause serious damage to the incinerator during the incineration process, reducing the reliability and service life of the magnetic separation device and the incinerator. Summary of the Invention

[0004] In view of the problem that ferromagnetic waste materials in the existing waste magnetic separation technology must be mechanically scraped from a strong magnetic field, which not only wastes energy but also seriously reduces the reliability and service life of the magnetic separation equipment, the present invention provides a variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials, including a support, a magnetic separation assembly, a mounting flange, a power input shaft, a magnetic separation drum, and a magnetic force reversing rod. The magnetic separation assembly further includes a connecting shaft, a bar magnet, a magnetic force reversing rudder, a self-lubricating bearing, a key, a return spring, and a positioning steel ball. When performing waste magnetic separation work, the power input shaft drives the mounting flange to drive the magnetic separation drum to rotate. Domestic waste materials pass through the surface of the magnetic separation drum through a waste feeding hopper. The magnetic waste materials therein are adsorbed on the surface of the drum by the magnetic force of the bar magnet, and the non-magnetic waste materials fall from the surface of the drum onto the non-magnetic waste material conveyor belt under the action of their own gravity. After the adsorbed magnetic waste materials rotate through the partition plate with the drum, the handle of the magnetic force reversing rudder will touch the magnetic force reversing rod. The magnetic separation assembly rotates under the action of the magnetic force reversing rod, and the bar magnet rotates 90° under the combined action of the return spring, the positioning steel ball, and the positioning hole. Consequently, the magnetic force direction of the magnetic field also rotates 90°. The magnetic waste materials fall onto the magnetic waste material conveyor belt due to the loss of the adsorption magnetic force. The magnetic force reversing rudder continues to rotate with the magnetic separation drum. When its handle touches another magnetic force reversing rod, the bar magnet rotates 90° again, that is, the magnetic force direction rotates 90° again, and the magnetic force can re-adsorb the magnetic waste materials on the surface of the magnetic separation drum. Thus, the magnetic separation of domestic waste materials in one cycle is completed. By continuously repeating this cycle, the magnetic separation of ferromagnetic domestic waste materials can be completed.

[0005] Beneficial effects

[0006] The variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials of the present invention completely avoids mechanically scraping ferromagnetic waste materials from a strong magnetic field, saves energy, reduces the cost of waste sorting and treatment, and extends the life and trouble-free working time of waste sorting equipment. In addition, it also improves the incineration efficiency of solid domestic waste, effectively avoids the damage of magnetic waste materials to the incinerator during the incineration process, and improves the service life, reliability, trouble-free working time, and economic benefits of the ferromagnetic domestic waste material treatment equipment and the production line.

[0007] The present invention achieves the above technical objectives through the following technical means:

[0008] A variable magnetic separation device for solid ferromagnetic domestic waste materials, comprising a support (1), a magnetic separation assembly (2), a mounting flange (3), a power input shaft (4), a magnetic separation drum (5) and a magnetic force reversing rod (6); the magnetic separation assembly (2) mainly includes a connecting shaft (2-1), a bar magnet (2-2), a magnetic force reversing rudder (2-3), a self-lubricating bearing (2-4), a key (2-5), a return spring (2-6) and a positioning steel ball (2-7); one end of the connecting shaft (2-1) is fixedly connected to the magnetic force reversing rudder (2-3) through the key (2-5), and the bar magnet (2-2) is fixedly connected to the connecting shaft (2-1); the bottom end of the return spring (2-6) is placed in the mounting hole (2-8), and a positioning steel ball (2-7) is fixed at its upper end; the mounting flange (3), the through hole II (3-2), the magnetic separation drum (5) and the power input shaft (4) are concentric, the mounting flange (3) is fixedly connected to both ends of the magnetic separation drum (5), and is fixedly connected to the power input shaft (4) through the through hole II (3-2); one end of the connecting shaft (2-1) of the magnetic separation assembly (2) is installed in the through hole I (3-1) of the mounting flange (3) through the self-lubricating bearing (2-4), and the other end is installed in the through hole I (3-1) of the mounting flange (3) at the other end through the self-lubricating bearing (2-4) with a positioning hole; one end of the magnetic force reversing rod (6) is fixed on the support (1). During the operation process, the magnetic separation drum (5) and its components rotate under the drive of the power input shaft (4), so that the rudder handle (2-3-1) of each magnetic force reversing rudder (2-3) is touched when passing through the position of the magnetic force reversing rod (6), driving the magnetic separation assembly (2) to rotate 90°, so that the magnetic force direction of the bar magnet (2-2) rotates 90° to be parallel to the tangent plane of the magnetic separation drum (5) and demagnetizes; the power input shaft (4) is connected to the support (1) through two self-lubricating bearings (2-4), and the support (1) can be fixed on the waste sorting platform through the support mounting hole (1-1).

[0009] Preferably, 4 evenly arranged positioning holes (2-4-1) are provided on the self-lubricating bearing (2-4) with a positioning hole, which are used to cooperate with the positioning steel ball (2-7) to complete the positioning of the magnetic force direction of the magnetic separation assembly (2), ensuring that the magnetic force direction rotates 90° every time the magnetic force reversing rudder (2-3) rotates once.

[0010] Preferably, one end of the connecting shaft (2-1) is provided with a mounting hole (2-8), a return spring (2-6), and a positioning steel ball (2-7). The bottom end of the return spring (2-6) is fixed in the mounting hole (2-8), and its upper end is fixed with the positioning steel ball (2-7). When the magnetic separation assembly (2) rotates, under the combined action of the return spring (2-6), the positioning steel ball (2-7), and the positioning hole (2-4-1), the magnetic separation assembly (2) just rotates by 90°, causing the magnetic field force of the bar magnet (2-2) acting on the magnetic waste on the surface of the magnetic separation drum (5) to change between presence and absence, which is beneficial to the screening and separation operation of ferromagnetic waste materials in domestic waste.

[0011] Preferably, the magnetic force reversing rods (6) are used in pairs. During one rotation of the magnetic separation drum (5), the magnetic force reversing rods (6) can cause the bar magnet (2-2) to rotate twice, that is, rotate two 90°.

[0012] Preferably, the Figure 2 dotted line area in the present invention is the installation position range of the magnetic force reversing rods (6). The two magnetic force reversing rods (6) are preferably installed at both ends of the installation position area shown, so as to achieve the best effect of magnetic separation of magnetic materials in domestic waste. Figure 2

[0013] Preferably, the diameter of the positioning hole (2-4-1) is slightly smaller than the diameter of the positioning steel ball (2-7), so as to facilitate the rotation and positioning of the magnetic separation assembly (2).

[0014] Preferably, the self-lubricating bearings selected for the variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials of the present invention have various models, different sizes, and are installed in different parts. Because they do not require lubrication during operation and have smaller clearances, they can reduce the entry of garbage dust and damage to the bearings, thereby improving the service life and working reliability of the magnetic separation device for magnetic materials in domestic waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials of the present invention.

[0016] Figure 2 is a schematic diagram of the sorting operation process of the solid ferromagnetic domestic waste materials of the present invention.

[0017] Figure 3 is a schematic diagram of the main component structure of the magnetic separation device of the present invention.

[0018] Figure 4 is a schematic diagram of the magnetic separation assembly structure of the magnetic separation device of the present invention.

[0019] Figure 5 is a schematic diagram of the installation flange structure of the magnetic separation device of the present invention. ​

[0020] Figure 6 It is a schematic structural diagram of the magnetic force reversing rod of the magnetic separation device of the present invention.

[0021] Figure 7 It is a schematic diagram of the self-lubricating bearing of the magnetic separation device of the present invention.

[0022] Figure 8 It is a schematic structural diagram of the self-lubricating bearing with positioning holes of the magnetic separation device of the present invention.

[0023] Figure 9 It is a schematic diagram of the change of the magnetic force direction of the bar magnet of the magnetic separation device of the present invention.

[0024] The description of the reference numerals is as follows:

[0025] 1. Support; 1-1. Support mounting hole; 2. Magnetic separation assembly; 2-1. Connecting shaft; 2-2. Bar magnet; 2-3. Magnetic force reversing rudder; 2-3-1. Rudder handle; 2-4. Self-lubricating bearing; 2-4-1. Positioning hole; 2-5. Key; 2-6. Return spring; 2-7. Positioning steel ball; 2-8. Mounting hole; 3. Mounting flange; 3-1. Through hole I; 3-2. Through hole II; 4. Power input shaft; 5. Magnetic separation drum; 6. Magnetic force reversing rod; 7. Garbage feeding hopper; 8. Domestic garbage; 9. Partition board; 10. Non-ferromagnetic garbage material; 11. Non-ferromagnetic garbage material conveyor belt; 12. Ferromagnetic garbage material conveyor belt; 13. Ferromagnetic garbage material. Detailed implementation manners

[0026] The structure, principle and working process of the present invention will be further described below with reference to the accompanying drawings.

[0027] A variable magnetic magnetic separation device for solid ferromagnetic domestic garbage materials provided by the present invention, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown in the figure, the present invention includes a support (1), a magnetic separation assembly (2), a mounting flange (3), a power input shaft (4), a magnetic separation drum (5) and a magnetic force reversing rod (6); the magnetic separation assembly (2) mainly includes a connecting shaft (2-1), a bar magnet (2-2), a magnetic force reversing rudder (2-3), a self-lubricating bearing (2-4), a key (2-5), a return spring (2-6) and a positioning steel ball (2-7); one end of the connecting shaft (2-1) is fixedly connected to the magnetic force reversing rudder (2-3) through the key (2-5), and the connecting shaft (2-1) is concentric with the reversing rudder (2-3); the bar magnet (2-2) is fixedly connected to the connecting shaft (2-1); the bottom end of the return spring (2-6) is installed in the mounting hole (2-8), and its upper end is fixed with a positioning steel ball (2-7) for the rotational positioning of the magnetic separation assembly (2); the mounting flange (3), the through hole II (3-2), the magnetic separation drum (5) and the power input shaft (4) are concentric, the mounting flange (3) is fixedly connected to both ends of the magnetic separation drum (5), and is fixedly connected to the power input shaft (4) through the through hole II (3-2); the power input shaft (4) is connected to the support (1) through two self-lubricating bearings (2-4), and the support (1) can be fixed on the waste sorting platform through the bolt holes.

[0028] As Figure 1 , Figure 4 , Figure 5 and Figure 8 shown in the figure, one end of the connecting shaft (2-1) of the magnetic separation assembly (2) is installed in the through hole I (3-1) of the mounting flange (3) through a self-lubricating bearing (2-4), and the other end is installed in the through hole I (3-1) of the mounting flange (3) through a self-lubricating bearing (2-4) with a positioning hole; there are 4 evenly distributed positioning holes (2-4-1) on the self-lubricating bearing (2-4) with a positioning hole, which are used to cooperate with the positioning steel ball (2-7) to complete the positioning of the magnetic force direction of the magnetic separation assembly (2), ensuring that each rotation of the magnetic force reversing rudder (2-3) rotates the magnetic force direction by 90°.

[0029] As Figure 2 and Figure 6 shown in the figure, one end of the magnetic force reversing rod (6) is fixed on the support (1). During the operation, the magnetic separation drum (5) and its components rotate under the drive of the power input shaft (4), so that the handle (2-3-1) of each magnetic force reversing rudder (2-3) is touched when passing through the position of the magnetic force reversing rod (6), driving the magnetic separation assembly (2) to rotate 90°, that is, rotating the magnetic force direction of the bar magnet (2-2) 90° to be parallel to the tangent plane of the magnetic separation drum (5) to demagnetize, or perpendicular to the tangent plane of the magnetic separation drum (5) to have the maximum magnetic force. The magnetic force reversing rods (6) are used in pairs, and the dotted line positions in the drawings are the suitable installation ranges of the magnetic force reversing rods (6) for the magnetic separation classification of domestic waste.

[0030] As Figure 9As shown in the figure, Figure (a) is a schematic diagram of the magnetic force direction of the bar magnet (2-2) when ferromagnetic waste materials are magnetically adsorbed on the surface of the magnetic separation drum (5) by the magnetic force of the magnetic separation assembly (2) during the operation process; when the magnetic separation assembly (2) rotates with the magnetic separation drum (5) and the handle (2-3-1) of the magnetic force reversing rudder (2-3) is touched by the magnetic force reversing rod (6), the bar magnet (2-2) will rotate 90°, and its magnetic force direction is as shown in Figure (b). At this time, the magnetic force for adsorbing ferromagnetic waste materials is eliminated, and the ferromagnetic waste materials will separate from the magnetic separation drum (5) under the action of their own gravity; when the magnetic separation assembly (2) continues to rotate with the magnetic separation drum (5) and the handle (2-3-1) of the magnetic force reversing rudder (2-3) is touched by the magnetic force reversing rod (6) again, the bar magnet (2-2) rotates 90° again, and its magnetic force direction is as shown in Figure (a) again. At this time, when its S pole faces and approaches the magnetic separation drum (5), it can re-adsorb the ferromagnetic materials in the waste, so as to complete the screening and separation of ferromagnetic materials in solid domestic waste.

[0031] The process of variable magnetic magnetic separation for solid ferromagnetic domestic waste materials of the present invention is as follows:

[0032] a), After starting the machine, the power input shaft (4) drives the mounting flange (3) and the magnetic separation drum (5) to rotate.

[0033] b), Solid domestic waste (8) passes through the surface of the magnetic separation drum (5) through the waste feeding hopper (7). At this time, the magnetic field direction of the bar magnet (2-2) is perpendicular to the tangent plane of the magnetic separation drum (5) and the magnetic force is the largest, and it can adsorb the ferromagnetic waste materials (13) therein on the outer circumferential surface of the magnetic separation drum (5), while the non-ferromagnetic waste materials (10) will fall into the non-ferromagnetic waste material conveyor belt (11) under the action of gravity.

[0034] c), The ferromagnetic waste materials (13) are adsorbed on the outer circumferential surface of the magnetic separation drum (5) due to the magnetic force of the bar magnet (2-2) and continue to rotate. After passing through the partition plate (9), the handle (2-3-1) of the magnetic force reversing rudder (2-3) installed on the magnetic separation assembly (2) will touch the magnetic force reversing rod (6). The magnetic separation assembly (2) rotates under the action of the magnetic force reversing rod (6) and rotates 90° with the cooperation of the positioning steel balls. After the bar magnet (2-2) rotates 90°, its magnetic field direction is parallel to the tangent plane of the magnetic separation drum (5). At this time, the ferromagnetic waste materials (13) will fall onto the ferromagnetic waste material conveyor belt (12) under the action of gravity due to the disappearance of the magnetic force, realizing the separation and treatment of ferromagnetic materials in solid domestic waste (8).

[0035] d), when the magnetic separation component (2) continues to rotate with the magnetic separation drum (5) and the tiller (2-3-1) touches another magnetic force reversing rod (6), it will drive the bar magnet (2-2) to rotate 90° through the magnetic force reversing rudder (2-3), the key (2-5), and the connecting shaft (2-1). The magnetic field direction is changed to be perpendicular to the tangent plane of the magnetic separation drum (5). When the solid domestic waste (8) passes through the surface of the magnetic separation drum (5), the ferromagnetic waste materials (13) therein can be adsorbed on the outer circumferential surface of the magnetic separation drum (5). By repeating such a continuous cycle, the magnetic separation of ferromagnetic waste materials from solid domestic waste can be completed.

[0036] The described embodiments are the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Without departing from the essential content of the present invention, any obvious improvements, substitutions, or modifications that those skilled in the art can make all fall within the protection scope of the present invention.

Claims

1. A variable magnetic separation device for solid ferromagnetic domestic waste materials, comprising a support (1), a magnetic separation assembly (2), a mounting flange (3), a power input shaft (4), a magnetic separation drum (5) and a magnetic force reversing rod (6); characterized in that: The described magnetic separation component (2) mainly includes a connecting shaft (2-1), a bar magnet (2-2), a magnetic force reversing rudder (2-3), a self-lubricating bearing (2-4), a key (2-5), a return spring (2-6), and a positioning steel ball (2-7). One end of the connecting shaft (2-1) of the magnetic separation component (2) is installed in the through hole I (3-1) of the mounting flange (3) through the self-lubricating bearing (2-4), and the other end is installed in the through hole I (3-1) of the mounting flange (3) at the other end through the self-lubricating bearing (2-4) with a positioning hole; the connecting shaft (2-1) passes through the bar magnet (2-2) and is fixedly connected to the bar magnet (2-2). One end of the connecting shaft (2-1) is fixedly connected to the magnetic force reversing rudder (2-3) through the key (2-5) and is concentric with the magnetic force reversing rudder (2-3). There are a mounting hole (2-8), a return spring (2-6), and a positioning steel ball (2-7) on the other end of the connecting shaft (2-1). The bottom end of the return spring (2-6) is installed in the mounting hole (2-8), and a positioning steel ball (2-7) is fixed at its upper end.

2. The variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, characterized in that, The described mounting flange (3), through hole II (3-2), magnetic separation drum (5) are concentric with the power input shaft (4). The mounting flange (3) is fixedly connected to both ends of the magnetic separation drum (5) and is fixedly connected to the power input shaft (4) through the through hole II (3-2); there are 4 uniformly arranged positioning holes (2-4-1) on the self-lubricating bearing (2-4) with a positioning hole, which are used to cooperate with the positioning steel ball (2-7) to complete the rotation and positioning of the magnetic force direction of the magnetic separation component (2), ensuring that the magnetic force direction rotates 90° every time the magnetic force reversing rudder (2-3) rotates.

3. The variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, wherein, One end of the described magnetic force reversing rod (6) is fixed on the support (1). During the operation process, the magnetic separation drum (5) and its components rotate driven by the power input shaft (4), so that the rudder handle (2-3-1) of each magnetic force reversing rudder (2-3) is touched when passing through the position of the magnetic force reversing rod (6), and drives the magnetic separation component (2) to rotate 90°, that is, the magnetic force direction of the bar magnet (2-2) rotates 90° to be parallel to the tangent plane of the magnetic separation drum (5) and demagnetizes, or is perpendicular to the tangent plane of the magnetic separation drum (5) and has the maximum magnetic force.

4. The variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, characterized in that, The described power input shaft (4) is connected to the support (1) through two self-lubricating bearings (2-4), and the support (1) can be fixed on the solid domestic waste sorting platform through the support mounting hole (1-1).

5. A variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, characterized in that When the magnetic separation device is working, the magnetic force reversing rod (6) makes the magnetic separation component (2) rotate by touching the rudder handle (2-3-1), and under the combined action of the return spring (2-6), the positioning steel ball (2-7), and the positioning hole (2-4-1), the magnetic separation component (2) rotates 90°, that is, the magnetic field direction of the bar magnet (2-2) rotates 90°. The originally adsorbed magnetic material waste demagnetizes due to the rotation of the magnetic force direction by 90° and falls under the action of gravity, realizing the magnetic separation of ferromagnetic waste materials.

6. The variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, characterized in that, The described magnetic force reversing rods (6) are used in pairs. During one rotation of the magnetic separation drum (5), the magnetic force reversing rods (6) cause the bar magnets (2-2) to rotate twice through the magnetic force reversing rudder (2-3), that is, the direction of the magnetic field changes twice, realizing the magnetic separation operation of sucking and separating solid ferromagnetic waste materials; the position of the dotted line area is the best range for the installation and adjustment of the magnetic force reversing rods (6), facilitating the complete magnetic separation of solid ferromagnetic waste materials.

7. The variable magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, characterized in that, The described self-lubricating bearing (2-4) is fitted and installed with the connecting shaft (2-1) at one end of the mounting hole (2-8) and the self-lubricating bearing (2-4) with the through hole I (3-1) containing the positioning hole. Four positioning holes (2-4-1) are provided on the self-lubricating bearing (2-4), and the diameter of the positioning holes (2-4-1) is smaller than the diameter of the positioning steel balls (2-7), facilitating the accurate rotation of the magnetic separation assembly (2) and the positioning of the magnetic field direction of the bar magnet (2-2).

8. A variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials according to claim 1, the sorting operation process of the variable magnetic magnetic separation device for solid ferromagnetic domestic waste materials of the present invention is as follows: a), After starting the machine, the power input shaft (4) drives the mounting flange (3) and the magnetic separation drum (5) to rotate; b), Solid domestic waste (8) passes through the surface of the magnetic separation drum (5) through the waste feeding hopper (7). At this time, the magnetic field direction of the bar magnet (2-2) is perpendicular to the tangent plane of the magnetic separation drum (5) and the magnetic force is the largest, and the ferromagnetic waste materials (13) therein can be adsorbed on the outer circumferential surface of the magnetic separation drum (5), while the non-ferromagnetic waste materials (10) fall onto the non-ferromagnetic waste material conveyor belt (11) under the action of gravity; c), The ferromagnetic waste materials (13) are adsorbed by the magnetic force of the bar magnet (2-2) and continue to rotate along with the outer circumferential surface of the magnetic separation drum (5). After passing through the partition plate (9), the handle (2-3-1) of the magnetic force reversing rudder (2-3) installed on the magnetic separation assembly (2) will touch the magnetic force reversing rod (6). The magnetic separation assembly (2) rotates under the action of the magnetic force reversing rod (6) and rotates 90° with the cooperation of the positioning steel balls. After the bar magnet (2-2) rotates 90°, its magnetic field direction is parallel to the tangent plane of the magnetic separation drum (5). At this time, the ferromagnetic waste materials (13) fall onto the ferromagnetic waste material conveyor belt (12) due to the disappearance of the magnetic force, realizing the screening and separation treatment of the magnetic materials in the solid ferromagnetic domestic waste (8). d), When the magnetic separation component (2) continues to rotate with the magnetic separation drum (5) and the rudder handle (2-3-1) touches another magnetic force reversing rod (6), it will drive the bar magnet (2-2) to rotate 90° through the magnetic force reversing rudder (2-3), the key (2-5), and the connecting shaft (2-1). The magnetic field direction changes to be perpendicular to the tangent plane of the magnetic separation drum (5). When the solid domestic waste (8) passes through the surface of the magnetic separation drum (5), it can adsorb the ferromagnetic waste material (13) on the outer circular surface of the magnetic separation drum (5); such continuous and cyclic operation can complete the variable magnetic magnetic separation of solid ferromagnetic domestic waste materials.

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