A device for removing magnetic impurities from a pellet feed

Abstract

The utility model relates to a granular feed magnetic impurity removal device, which comprises a spiral conveying mechanism and a magnetic separation mechanism, wherein the spiral conveying mechanism comprises a feeding hopper, a conveying pipeline, a conveying frame, a conveying motor, a discharging pipe, a conveying shaft and spiral blades; the magnetic separation mechanism is arranged below the rear end of the spiral conveying mechanism, and comprises a magnetic separation shell, a magnetic separation frame, a magnetic separation motor, a material blocking block, a magnetic separation rotating body, a magnet, a rotating shaft, a driving connecting shaft and an impurity collecting plate; the magnet is in the shape of an incomplete truncated cone with a certain width of notches on the side surface to form a non-magnetic area; the magnetic separation rotating body is coaxially arranged outside the magnet; the outer surface of the truncated cone part and the cylindrical part of the magnetic separation rotating body is uniformly provided with a plurality of partitions to form a plurality of magnetic separation grooves on the outer surface of the magnetic separation rotating body. The utility model has the advantages of simple structure, suitable working principle, convenient machine cooperation and the like.

Description

Technical Field

[0001] This utility model belongs to the field of feed impurity removal technology, specifically relating to a device for removing magnetic impurities from pelleted feed, used to remove magnetic impurities from pelleted feed to improve the quality and grade of pelleted feed. Background Technology

[0002] During the production and processing of pelleted feed, due to the diversity of raw material sources, some magnetic impurities, such as iron filings and nails, may be introduced during harvesting, transportation, storage, and processing. These magnetic impurities not only affect the overall quality of the pelleted feed but may also damage subsequent processing equipment, posing a threat to the quality of the feed and the safe operation of production equipment. The presence of magnetic impurities also affects the palatability and nutritional value of the feed, damages the digestive system of animals consuming pelleted feed, and may even cause disease. For example, when magnetic impurities enter the digestive tract of cattle, they may cause a series of problems such as physical damage, local infection and inflammation, digestive dysfunction, and nutrient absorption disorders, and may also hinder the cattle's production and reproductive performance. Therefore, the market needs an effective device to remove these magnetic impurities from pelleted feed to ensure its quality and safety. Currently, although some screening devices are available on the market for removing impurities from feed, there is still room for improvement in dedicated, efficient, and practical magnetic impurity removal devices. For example, some simple magnetic separation devices suffer from low removal efficiency, complex structures that are difficult to operate, and inability to integrate well with existing feed conveying equipment. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a device for removing magnetic impurities from pelleted feed, thereby solving the problem that magnetic impurities are difficult to effectively remove during the production of pelleted feed in existing livestock farms. This utility model has the advantages of simple structure, suitable working principle, and convenient machine cooperation.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A device for removing magnetic impurities from pelleted feed includes a screw conveyor mechanism and a magnetic separation mechanism.

[0006] The spiral conveying mechanism includes a feed hopper 101, a conveying pipe 103, a conveyor frame 105, a conveying motor 106, a discharge pipe 109, a conveying shaft 110, and spiral blades 111. The conveying pipe 103 is fixedly connected to the conveyor frame 105 at an angle with the front lower than the rear via a fixing belt 104. The upper front end of the conveying pipe 103 is connected to the bottom of the feed hopper 101, and the lower rear end is connected to the top of the discharge pipe 109.

[0007] The conveying shaft 110 and the helical blade 111 are disposed inside the conveying pipe 103; the conveying shaft 110 and the helical blade 111 are welded together; the top end of the conveying shaft 110 is provided with a driven pulley 114; the conveying motor 106 is fixedly connected to the upper end of the conveying pipe 103 through the conveying motor base 107, and a drive pulley 112 is fixedly connected to the power output shaft of the conveying motor 106; the drive pulley 112 and the driven pulley 114 are connected by a transmission belt 113.

[0008] The magnetic separation mechanism is located below the rear end of the screw conveyor mechanism. The magnetic separation mechanism includes a magnetic separator housing 201, a magnetic separator frame 204, a magnetic separator motor 205, a baffle block 210, a magnetic separator rotating body 211, a magnet 216, a rotating shaft 218, a drive connecting shaft 220, and an impurity collection plate 224. The magnetic separator housing 201 is composed of a frustum-shaped shell 202, a cylindrical shell 203, and a receiving hopper 207, which are fixedly connected from top to bottom. The frustum-shaped shell... The feed inlet at the top of 202 is sealed and connected to the bottom end of the discharge pipe 109 of the screw conveyor mechanism; the cylindrical shell 203 is fixedly connected to the magnetic separator frame 204, and the lower part of the cylindrical shell 203 is provided with a magnetic impurity discharge port 206; the bottom of the receiving hopper 207 is provided with a pellet feed discharge port 208; the support tube 215 is L-shaped, including a vertical part and a horizontal part; the vertical part of the support tube 215 is vertical along the axis of the magnetic separator shell 201. The arrangement is as follows: the horizontal part is fixed to the lower part of the cylindrical shell 203 via a support frame 213; the magnetic separator motor 205 is fixed to the outside of the cylindrical shell 203 via a magnetic separator motor base 214; the power output shaft of the magnetic separator motor 205 passes through the cylindrical shell 203 and is connected to the drive connecting shaft 220, which is horizontally arranged in the horizontal part of the support tube 215 via a bearing seat 221; the end of the drive connecting shaft 220 is provided with a drive gear 222; the rotating shaft 218 is coaxially arranged in the vertical part of the support tube 215 via a bearing seat, and the bottom end of the rotating shaft 218 is provided with a driven gear 219 that meshes with the drive gear 222; the magnet fixing frustum 223 is coaxially fixed to the outside of the support tube 215, and the magnet 216 is fixed to the outer surface of the magnet fixing frustum 223; the magnet 216 is in the shape of an incomplete frustum with a notch of a certain width on the side, forming a non-magnetic area.

[0009] The magnetic separator 211 is coaxially arranged outside the magnet 216. The magnetic separator 211 is made of a non-ferromagnetic material. The magnetic separator 211 has a frustum and a cylindrical part that are fixedly connected to each other. The inner surface of the frustum of the magnetic separator 211 is spaced a certain distance from the outer surface of the magnet 216. The top end of the frustum of the magnetic separator 211 is fixedly connected to the top end of the rotating shaft 218 through a rotating connector 217. Multiple partitions 212 are uniformly arranged circumferentially on the outer surface of the frustum and cylindrical parts of the magnetic separator 211, so that multiple magnetic separation grooves are formed on the outer surface of the magnetic separator 211. The distance between two adjacent partitions 212 corresponds to the width of the notch of the magnet 216. The partitions 212 are spaced a certain distance from the inner surfaces of the frustum shell 202 and the cylindrical shell 203.

[0010] The baffle block 210 is fixed to the inner surface of the discharge pipe 109, located above the magnetic separator 211 at a position corresponding to the notch of the magnet 216, and the width of the baffle block 210 is greater than the width of the notch of the magnet 216, to prevent impurity-containing pellet feed from directly entering the non-magnetic area formed by the notch of the magnet 216 in the magnetic separator 211; the impurity collection plate 224 is fixed to the cylindrical shell 203 by a support plate, located below the magnetic separator 211 at a position corresponding to the notch of the magnet 216, and the width of the impurity collection plate 224 is greater than the width of the notch of the magnet 216, and the impurity collection plate 224 is connected to the magnetic impurity discharge port 206.

[0011] The magnet 216 has an upper bottom notch width d of 3~8cm and a lower bottom notch width D of 5~12cm.

[0012] Preferably, the width d of the upper bottom notch of the magnet 216 is 5cm; the width D of the lower bottom notch is 8cm.

[0013] The feed hopper 101 is in the shape of an inverted quadrangular prism; the conveying pipe 103 is a closed cylindrical pipe made of a sturdy and wear-resistant metal material; the bottom of the feed hopper 101 is provided with a feed baffle 102 that can be slidably pulled out.

[0014] The drive pulley 112 and the driven pulley 114 are provided with protective covers 108 on their outer sides.

[0015] The bottom of the magnetic separator frame 204 is provided with height-adjustable support feet 209.

[0016] Preferably, the magnet 216 is a neodymium iron boron magnet; the magnetic separator 211 is made of ultra-high molecular weight polyethylene.

[0017] The angle between the generatrix of the frustum portion of the magnetic separator 211 and the bottom surface is 50°~70°.

[0018] Preferably, the angle between the generatrix of the frustum portion of the magnetic separator 211 and the bottom surface is 65°.

[0019] The screw conveyor feeds pellets to the magnetic separator at a rate of 300 kg / h to 500 kg / h, and the magnetic separator 211 rotates at a speed of 5 to 10 r / min.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. The frustum-shaped magnet design inside the magnetic separator enables efficient adsorption and separation of magnetic impurities in the pelleted feed. The screw conveyor mechanism ensures even distribution of the pelleted feed during transport, providing optimal conditions for the magnetic separator to function effectively.

[0022] 2. The magnetic separation mechanism can effectively remove magnetic impurities, preventing them from entering subsequent processing equipment such as granulators and crushers. This reduces the frequency of equipment failures caused by impurity wear, extends the service life of the equipment, and lowers equipment maintenance costs and replacement frequency, thus saving costs for enterprises.

[0023] 3. The combination of the screw conveyor and the magnetic separator is simple, easy to operate and adjust, and can adapt to different types and specifications of pellet feed production processes. Whether it is a small feed processing plant or a large feed production enterprise, this device can be quickly applied.

[0024] 4. Magnetic separation mechanisms efficiently remove impurities while reducing energy consumption compared to traditional methods. Furthermore, by reducing equipment wear and tear and maintenance frequency, they also reduce waste generated during equipment repairs, aligning with environmental protection principles. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the device for removing magnetic impurities from pellet feed according to this utility model.

[0026] Figure 2 This is a schematic diagram of the feed baffle 102;

[0027] Figure 3 This is a schematic diagram of the conveyor shaft 110 and the spiral blade 111.

[0028] Figure 4 This is a schematic diagram of the structure of the driving pulley 112 and the driven pulley 114;

[0029] Figure 5 This is a schematic diagram of the internal structure of the magnetic separator (hidden frustum shell 202 and cylindrical shell 203);

[0030] Figure 6 This is a cross-sectional structural diagram of the magnetic separation mechanism;

[0031] Figure 7 This is a top view of the magnetic separation mechanism.

[0032] Figure 8 This is a schematic diagram of the structure of magnet 216;

[0033] Figure 9 This is a schematic diagram of the drive structure of the magnetic separator rotating body 211 of the magnetic separator mechanism;

[0034] Figure 10 This is a schematic diagram of the internal structure of the lower half of the cylindrical shell 203.

[0035] The reference numerals in the attached figures are:

[0036] 101 Feed Hopper 102 Feed baffle 103 Conveying Pipeline 104 fixing strap 105 Conveyor Frame 106 Conveyor Motor 107 Conveyor Motor Base 108 Protective Cover 109 Discharge pipe 110 Conveyor Shaft 111 Helical blade 112 Drive pulley 113 Transmission belt 114 Driven pulley 201 Magnetic Separator Shell 202 Frustum shell 203 Cylindrical shell 204 Magnetic Separator Frame 205 Magnetic Separator Motor 206 Magnetic impurity discharge port 207 Receiving Hopper 208 Pellet Feed Discharge Port 209 Supporting Legs 210 stop block 211 Magnetic Separation Rotating Body 212 partition 213 Support frame 214 Magnetic Separator Motor Base 215 Supporting pipe 216 magnets 217 Rotary connector 218 Rotation axis 219 Driven gear 220 drive connecting shaft 221 Bearing Housing 222 Drive gear 223 Magnet-fixed frustum 224 Impurity Collection Plate Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1 As shown, a device for removing magnetic impurities from pelleted feed includes a screw conveyor mechanism and a magnetic separation mechanism.

[0039] The spiral conveying mechanism includes a feed hopper 101, a conveying pipe 103, a conveyor frame 105, a conveying motor 106, a discharge pipe 109, a conveying shaft 110, and spiral blades 111. The conveying pipe 103 is fixedly connected to the conveyor frame 105 at an angle with the front lower than the rear via a fixing belt 104. The upper front end of the conveying pipe 103 is connected to the bottom of the feed hopper 101, and the lower rear end is connected to the top of the discharge pipe 109.

[0040] The feed hopper 101 is an inverted quadrangular prism, used to receive pelleted feed from the upstream process or to directly feed pelleted feed. Its shape and size are designed to connect well with the discharge end of existing feed production equipment, thereby ensuring smooth feed feeding.

[0041] like Figure 2 As shown, the bottom of the feed hopper 101 is provided with a sliding feed baffle 102, which can ensure good sealing inside the conveying pipe 103 when not in operation.

[0042] The conveying pipe 103 is a closed cylindrical pipe, and the conveying shaft 110 and the spiral blade 111 are arranged inside the conveying pipe 103; for example Figure 3As shown, the conveying shaft 110 and the spiral blade 111 are welded together; a driven pulley 114 is provided at the top of the conveying shaft 110; the conveying motor 106 is fixedly connected to the upper end of the conveying pipe 103 via the conveying motor base 107, and a drive pulley 112 is fixedly connected to the power output shaft of the conveying motor 106; as shown Figure 4 As shown, the drive pulley 112 and the driven pulley 114 are connected by a transmission belt 113.

[0043] Preferably, a protective cover 108 is provided on the outer side of the drive pulley 112 and the driven pulley 114.

[0044] The conveying pipe 103 is made of a strong and wear-resistant metal material, such as stainless steel or high-strength aluminum alloy, to ensure long-term stable operation and prevent feed contamination caused by pipe wear.

[0045] like Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the magnetic separation mechanism is arranged below the rear end of the screw conveyor mechanism. The magnetic separation mechanism includes a magnetic separator shell 201, a magnetic separator frame 204, a magnetic separator motor 205, a baffle block 210, a magnetic separator rotating body 211, a magnet 216, a rotating shaft 218, a drive connecting shaft 220, and an impurity collection plate 224. The magnetic separator shell 201 is composed of a frustum shell 202, a cylindrical shell 203, and a receiving hopper 207, which are fixedly connected from top to bottom. The inlet at the top of the frustum shell 202 is sealed and connected to the bottom end of the discharge pipe 109 of the screw conveyor mechanism, which can effectively avoid waste caused by splashing of pellet feed during descent. The cylindrical shell 203 is fixed to the magnetic separator frame 204, and the lower part of the cylindrical shell 203 is provided with a magnetic impurity discharge port 206. The bottom of the receiving hopper 207 is provided with a pellet feed discharge port 208. The support tube 215 is L-shaped and includes a vertical part and a horizontal part. The vertical part of the support tube 215 is arranged vertically along the axis of the magnetic separator housing 201, and the horizontal part is fixed to the lower part of the cylindrical housing 203 by a support frame 213. The magnetic separator motor 205 is fixed to the outside of the cylindrical housing 203 by a magnetic separator motor base 214. The power output shaft of the magnetic separator motor 205 passes through the cylindrical housing 203 and is connected to the drive connecting shaft 220, which is arranged horizontally in the horizontal part of the support tube 215 by a bearing seat 221. The end of the drive connecting shaft 220 is provided with a drive gear 222. The rotating shaft 218 is arranged coaxially in the vertical part of the support tube 215 by a bearing seat, and the bottom end of the rotating shaft 218 is provided with a driven gear 219 that meshes with the drive gear 222. The magnet fixing frustum 223 is coaxially fixed to the outside of the support tube 215, and the magnet 216 is fixed to the outer surface of the magnet fixing frustum 223. Figure 8As shown, the magnet 216 is in the shape of an incomplete frustum, with a notch of a certain width on its side to form a non-magnetic area. The notch faces the magnetic impurity outlet 206. Preferably, the width d of the upper notch of the magnet 216 is 3~8cm, preferably 5cm; the width D of the lower notch is 5~12cm, preferably 8cm.

[0046] The magnetic separator 211 is coaxially arranged outside the magnet 216. The magnetic separator 211 is made of a non-ferromagnetic material, preferably ultra-high molecular weight polyethylene (UHMWPE), which has advantages such as non-magnetism, high wear resistance, and strong corrosion resistance. The magnetic separator 211 has a frustum and a cylindrical part fixedly connected to each other. The inner surface of the frustum of the magnetic separator 211 is spaced apart from the outer surface of the magnet 216 by a certain distance. The top of the frustum of the magnetic separator 211 is fixedly connected to the top of the rotating shaft 218 through a rotating connector 217. Multiple partitions 212 are uniformly arranged circumferentially on the outer surface of the frustum and cylindrical parts of the magnetic separator 211, forming multiple magnetic separation grooves on the outer surface of the magnetic separator 211. The distance between two adjacent partitions 212 corresponds to the width of the notch in the magnet 216. The partitions 212 are spaced apart from the inner surfaces of the frustum shell 202 and the cylindrical shell 203 by a certain distance.

[0047] Preferably, the angle between the generatrix of the frustum portion of the magnetic separator 211 and the bottom surface is 50°~70°, and more preferably 65°.

[0048] like Figure 7 As shown, the baffle block 210 is fixed to the inner surface of the discharge pipe 109, located above the notch of the magnet 216, and spaced a certain distance from the rotating connector 217, partially shielding the magnetic separator 211; furthermore, the magnetic separator 211 rotates clockwise ( Figure 7 As indicated by the arrow ω, the baffle block 210 rotates, blocking multiple magnetic separation cells (including the non-magnetic separation cell corresponding to the notch of magnet 216) adjacent to the magnetic separation rotating body 211 in a counterclockwise direction. This ensures that the impurity-laden feed pellets entering the magnetic separation mechanism have sufficient time to fall, preventing the pellets from rotating into the non-magnetic area formed by the notch of magnet 216. Therefore, the rotation speed of the magnetic separation rotating body 211 should also be controlled according to the condition of the feed pellets. The impurity collection plate 224 is fixed to the cylindrical shell 203 by a support plate, located below the magnetic separation rotating body 211 at a position corresponding to the notch of magnet 216, and connected to the magnetic impurity outlet 206.

[0049] Preferably, the bottom of the magnetic separator frame 204 is provided with height-adjustable support feet 209.

[0050] Preferably, the magnet 216 is a neodymium iron boron magnet.

[0051] Preferably, the feed rate of the screw conveyor to the magnetic separator is 300 kg / h to 500 kg / h, and the rotation speed of the magnetic separator 211 is 5 to 10 r / min.

[0052] The working process of this utility model is as follows:

[0053] Pellet feed containing magnetic impurities enters the conveying pipe 103 through the feed hopper 101 of the screw conveyor mechanism and is transported from bottom to top to the feed inlet of the magnetic separation mechanism. After entering the magnetic separation mechanism, the pellet feed containing magnetic impurities falls freely under its own gravity over the surface of the non-ferromagnetic magnetic separator 211, which rotates at a certain speed inside. Due to the action of the magnet 216, the magnetic impurities are adsorbed on the surface of the magnetic separator 211, while the feed pellets, being non-magnetic, fall smoothly to the bottom into the receiving hopper 207 and are discharged from the pellet feed outlet 208. When a magnetic separation tank of the magnetic separator 211 rotates to the non-magnetic area of ​​the magnet 216, the magnetic impurities fall freely onto the impurity collection plate 224 below and are discharged from the magnetic impurity outlet 206, thus completing the process of removing magnetic impurities from the pellet feed.

Claims

1. A device for removing magnetic impurities from pelleted feed, characterized in that, The device for removing magnetic impurities from pellet feed includes a screw conveyor mechanism and a magnetic separation mechanism; The spiral conveying mechanism includes a feed hopper (101), a conveying pipe (103), a conveyor frame (105), a conveying motor (106), a discharge pipe (109), a conveying shaft (110), and spiral blades (111); the conveying pipe (103) is fixedly connected to the conveyor frame (105) at an incline with the front lower than the rear by a fixing belt (104); the upper front end of the conveying pipe (103) is connected to the bottom of the feed hopper (101), and the lower rear end is connected to the top of the discharge pipe (109); The conveying shaft (110) and the helical blade (111) are arranged inside the conveying pipe (103); the conveying shaft (110) and the helical blade (111) are welded together; the top of the conveying shaft (110) is provided with a driven pulley (114); the conveying motor (106) is fixed to the upper end of the conveying pipe (103) through the conveying motor base (107), and a drive pulley (112) is fixed to the power output shaft of the conveying motor (106); the drive pulley (112) and the driven pulley (114) are connected by a transmission belt (113); The magnetic separation mechanism is located below the rear end of the screw conveyor mechanism. The magnetic separation mechanism includes a magnetic separator housing (201), a magnetic separator frame (204), a magnetic separator motor (205), a baffle block (210), a magnetic separator rotating body (211), a support tube (215), a magnet (216), a rotating shaft (218), a drive connecting shaft (220), a magnet fixing frustum (223), and an impurity collection plate (224). The magnetic separator housing (201) is composed of a frustum shell (202) and a cylindrical shell (203) fixedly connected from top to bottom. The truncated cone shell (202) consists of a feed inlet at the top and a receiving hopper (207); the feed inlet at the top of the truncated cone shell (202) is sealed and connected to the bottom of the discharge pipe (109) of the screw conveyor mechanism; the cylindrical shell (203) is fixed to the magnetic separator frame (204), and the lower part of the cylindrical shell (203) is provided with a magnetic impurity discharge port (206); the bottom of the receiving hopper (207) is provided with a pellet feed discharge port (208); the supporting tube (215) is L-shaped, including a vertical part and a horizontal part; the vertical part of the supporting tube (215) is along the magnetic separator frame (204). The axis of the outer casing (201) is arranged vertically, and the horizontal part is fixed to the lower part of the cylindrical casing (203) by a support frame (213); the magnetic separator motor (205) is fixed to the outside of the cylindrical casing (203) by a magnetic separator motor base (214); the power output shaft of the magnetic separator motor (205) passes through the cylindrical casing (203) and is connected to the drive connecting shaft (220) which is arranged horizontally in the horizontal part of the support tube (215) through a bearing seat (221); the end of the drive connecting shaft (220) is provided with a drive gear. (222); The rotating shaft (218) is arranged coaxially in the vertical part of the support tube (215) through the bearing seat, and the bottom end of the rotating shaft (218) is provided with a driven gear (219) that meshes with the drive gear (222); The magnet fixing frustum (223) is coaxially fixed to the outside of the support tube (215), and the magnet (216) is fixed to the outer surface of the magnet fixing frustum (223); The magnet (216) is in the shape of an incomplete frustum, with a notch of a certain width on the side to form a non-magnetic area; The magnetic separation rotating body (211) is arranged coaxially outside the magnet (216), and the magnetic separation rotating body (211) is made of non-ferromagnetic material; the magnetic separation rotating body (211) has a frustum and a cylindrical part fixedly connected to each other; the inner surface of the frustum of the magnetic separation rotating body (211) is spaced a certain distance from the outer surface of the magnet (216); the top of the frustum of the magnetic separation rotating body (211) is fixedly connected to the top of the rotating shaft (218) through a rotating connector (217); multiple partitions (212) are uniformly arranged circumferentially on the outer surface of the frustum and cylindrical parts of the magnetic separation rotating body (211), so that multiple magnetic separation grooves are formed on the outer surface of the magnetic separation rotating body (211); the distance between two adjacent partitions (212) corresponds to the notch width of the magnet (216); the partitions (212) are spaced a certain distance from the inner surfaces of the frustum shell (202) and the cylindrical shell (203); The baffle block (210) is fixed to the inner surface of the discharge pipe (109) and is located above the magnetic separator (211) at a position corresponding to the notch of the magnet (216). The width of the baffle block (210) is greater than the width of the notch of the magnet (216) to prevent impurity pellet feed from directly entering the area of ​​the magnetic separator (211) corresponding to the non-magnetic area formed by the notch of the magnet (216). The impurity collection plate (224) is fixed to the cylindrical shell (203) by a support plate and is located below the magnetic separator (211) at a position corresponding to the notch of the magnet (216). The width of the impurity collection plate (224) is greater than the width of the notch of the magnet (216). The impurity collection plate (224) is connected to the magnetic impurity discharge port (206).

2. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The width d of the upper bottom notch of the magnet (216) is 3~8cm; the width D of the lower bottom notch is 5~12cm.

3. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The magnet (216) has an upper bottom notch width d of 5cm and a lower bottom notch width D of 8cm.

4. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The feed hopper (101) is in the shape of an inverted quadrangular prism; the conveying pipe (103) is a closed cylindrical pipe made of a strong and wear-resistant metal material; the bottom of the feed hopper (101) is provided with a feed baffle (102) that can be slidably pulled out.

5. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The drive pulley (112) and driven pulley (114) are provided with protective covers (108) on their outer sides.

6. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The bottom of the magnetic separator frame (204) is provided with height-adjustable support feet (209).

7. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The magnet (216) is a neodymium iron boron magnet; the magnetic separator (211) is made of ultra-high molecular weight polyethylene.

8. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The angle between the generatrix of the frustum portion of the magnetic separator (211) and the bottom surface is 50°~70°.

9. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The angle between the generatrix of the frustum portion of the magnetic separator (211) and the bottom surface is 65°.

10. The device for removing magnetic impurities from pelleted feed according to claim 1, characterized in that, The feed rate of the screw conveyor to the magnetic separator is 300 kg / h to 500 kg / h, and the rotation speed of the magnetic separator (211) is 5 to 10 r / min.

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