A drum screen assembly for a magnetic separator device
Patent Information
- Application Number
- CN202522565533.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-03
AI Technical Summary
Existing drum screen components suffer from uneven material distribution and uncontrollable feed speed during material screening, resulting in low screening efficiency and unstable accuracy.
Spiral guide ribs are arranged axially on the inner wall of the drum. The cross-section of the spiral guide ribs is a right triangle with the inclined surface facing the feed end. The vertical surface makes an angle of 75° to 85° with the radial direction of the drum wall. Combined with the diamond-shaped screen hole design, the drum is driven to rotate by the drive mechanism to achieve uniform distribution and controllable propulsion of the material.
It increases the contact opportunity between materials and screen holes, significantly improves screening efficiency, reduces material jamming, strengthens the cylinder wall, extends equipment service life, has strong adaptability, and reduces energy consumption and maintenance costs.
Smart Images
Figure CN224926461U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of magnetic separator screening components, specifically, it relates to a drum-type screening component of a magnetic separator device. Background Technology
[0002] In industrial sectors such as mining, metallurgical processing, and building materials production, magnetic separators are widely used for the sorting and purification of magnetic materials. Drum screens, as a crucial pre-treatment unit within magnetic separators, primarily function to classify raw materials by particle size and perform initial screening for impurities, ensuring that subsequent magnetic separation processes yield materials of suitable particle size. Existing drum screens typically employ a simple cylindrical structure with circular or square screen holes on the drum wall. The rotation of the drum causes the material to tumble inside and pass through the screen holes for classification. However, this traditional structure has significant drawbacks. Because the inside of the drum is a smooth cylindrical surface, the material primarily moves due to gravity and the centrifugal force generated by the drum's rotation, lacking an effective axial propulsion mechanism. This results in material... Material tends to accumulate at the feed end, causing localized overload and blockage, while the discharge end experiences idling due to insufficient material. This results in the inefficient use of the drum's effective screening area. Furthermore, since material tumbling primarily depends on drum speed, insufficient tumbling at low speeds leads to low screening efficiency, while excessively high speeds cause material to be thrown against the drum wall, also failing to pass through the screen openings effectively. To address this issue, some technical solutions incorporate simple baffles or lifting plates inside the drum, attempting to promote material tumbling. However, these methods have limited effectiveness, as the material propulsion speed remains difficult to control, and the improvement in screening efficiency is not significant. Therefore, there is an urgent need for a drum-type screening component that can achieve uniform material distribution, controllable propulsion, and sufficient tumbling to meet the demands of modern industry for high-efficiency and high-precision material screening. Utility Model Content
[0003] In view of this, the present invention provides a drum-type screening component for a magnetic separator, which can solve the technical problems of uneven material distribution and uncontrollable propulsion speed in existing magnetic separators when screening materials. This is because the drum lacks an effective material propulsion and tumbling structure, resulting in some materials being discharged before they can be fully screened due to insufficient residence time, while other materials accumulate and cause blockages in the drum. This leads to low screening efficiency and unstable screening accuracy, affecting the overall working performance and material processing quality of the magnetic separator.
[0004] This utility model is implemented as follows:
[0005] This utility model provides a drum-type screening component for a magnetic separator, used for grading and screening materials. It includes a screening drum and a support frame. Both ends of the screening drum are rotatably connected to the support frame via bearing seats. Multiple screen holes are evenly distributed circumferentially on the drum wall. Multiple spiral guide ribs are axially arranged on the inner wall of the screening drum. The cross-section of each spiral guide rib is a right-angled triangle, with the inclined surface of the spiral guide rib facing the feed end of the screening drum. The vertical surface of the spiral guide rib makes an angle of 75° to 85° with the radial direction of the inner wall of the screening drum. A feed inlet is located at the center of the feed end face of the screening drum. A drive mechanism is mounted on the support frame and is connected to one end of the screening drum for driving the screening drum to rotate around its axis.
[0006] The technical effects of the drum screening component of the magnetic separator provided by this utility model are as follows: By setting multiple spiral guide ribs along the axial direction on the inner wall of the screening drum, and designing the cross-section of the spiral guide ribs as right-angled triangles with the inclined surface facing the feed end, the material can be pushed forward along the inclined surface of the spiral guide ribs during the rotation of the drum. At the same time, the design of the vertical surface of the spiral guide ribs and the radial angle between the cylinder wall and the drum wall is 75° to 85°, ensuring that the material can be fully tumbled and scattered while being pushed, increasing the contact opportunity between the material and the screen holes, improving screening efficiency, and solving the problem of insufficient screening caused by uneven material pushing speed in traditional screening drums.
[0007] Based on the above technical solution, the drum screening component of the magnetic separator of this utility model can be further improved as follows:
[0008] The spiral helix angle of the spiral guide rib along the axial direction of the screening drum is 8° to 15°.
[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the spiral rise angle of the spiral guide rib along the axial direction of the screening drum to the range of 8° to 15°, it ensures that the material has sufficient residence time in the drum for thorough screening, and avoids the problems of the material pushing speed being too slow and causing blockage due to the spiral rise angle being too small, or the material pushing speed being too fast and not enough time to be screened due to the spiral rise angle being too large. This achieves the best balance between the material pushing speed and the screening time, and improves the overall working efficiency of the screening component.
[0010] Furthermore, the sieve holes are rhomboid in shape, with the long diagonal of the sieve holes parallel to the axial direction of the screening drum, and the short diagonal of the sieve holes perpendicular to the axial direction of the screening drum.
[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By designing the screen holes as rhombuses, with the long diagonal parallel to the axis of the screening drum and the short diagonal perpendicular to the axis, the material can more easily pass through the screen holes along the long diagonal direction under the dual action of drum rotation and spiral guide ribs, reducing the phenomenon of material jamming at the screen holes. At the same time, the structural design of the rhombus screen holes enhances the strength of the drum wall, avoids the problem of drum wall cracking caused by stress concentration between circular screen holes, and extends the service life of the screening drum.
[0012] Furthermore, the height of the spiral guide ribs gradually decreases from the feed end to the discharge end along the axial direction of the screening drum.
[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the height of the spiral guide rib gradually decrease from the feed end to the discharge end along the axial direction of the screening drum, it adapts to the actual situation that the amount of material gradually decreases during the screening process, avoids the empty operation and energy waste caused by the guide rib of the same height at the discharge end due to the small amount of material, and at the same time, the design of decreasing height reduces the overall weight of the screening drum, reduces the load on the drive mechanism, reduces the energy consumption of the equipment, and improves the economy and practicality of the screening components.
[0014] Furthermore, the distance between two adjacent spiral guide ribs along the circumference of the screening drum is greater than the maximum height of a single spiral guide rib along the radial direction of the screening drum.
[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the distance between two adjacent spiral guide ribs along the circumference of the screening drum greater than the maximum radial height of a single spiral guide rib, it is ensured that the material has sufficient tumbling space between adjacent guide ribs, avoiding the problem that the material is squeezed between the guide ribs and cannot fully contact the screen holes due to the small distance between the guide ribs. At the same time, the reasonable spacing design enables the material to form a uniform material layer distribution during the rotation of the drum, which improves the effective contact area between the material and the screen holes during the screening process and significantly improves the screening efficiency.
[0016] Furthermore, the wall thickness of the screening drum is uniformly distributed along the axial direction, and the edges of the screen holes are rounded and chamfered.
[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the wall thickness of the screening drum uniformly distributed along the axial direction, the dynamic balance performance of the screening drum during high-speed rotation is guaranteed, avoiding vibration and noise problems caused by uneven wall thickness. At the same time, the edge of the screen hole is designed with a rounded chamfer transition, eliminating the cutting and wear effect of sharp edges on the material, reducing the resistance of the material when passing through the screen hole, reducing the probability of fine particles being caught on the edge of the screen hole, and improving the screening throughput and screening accuracy.
[0018] Furthermore, the bearing housing is fixedly connected to the support frame via a flange, and the flange has multiple bolt holes evenly distributed along its circumference.
[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By using a structure in which the bearing housing is fixedly connected to the support frame with a flange, and by evenly opening multiple bolt holes along the circumference on the flange, reliable fixation and convenient disassembly and assembly are achieved between the bearing housing and the support frame. When the bearing needs maintenance or replacement, it can be quickly completed by simply removing the bolts, which greatly shortens the equipment maintenance time. At the same time, the flange connection method can effectively disperse the radial and axial forces generated when the screening drum rotates, thereby improving the stability and service life of the support structure.
[0020] Furthermore, in the right-angled triangular cross-section of the spiral guide rib, the height of the vertical surface is greater than the width of the bottom surface of the spiral guide rib.
[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing the right-angled triangular cross-section of the spiral guide rib to have a vertical height greater than the bottom width, the pushing and guiding effect of the spiral guide rib on the material is enhanced. The higher vertical surface can prevent the material from flowing back and ensure that the material is continuously pushed towards the discharge end. At the same time, the narrower bottom width reduces the welding area between the spiral guide rib and the inner wall of the screening drum, reducing the manufacturing difficulty and cost. This optimized design of the cross-sectional dimensions achieves structural lightweighting while ensuring the pushing effect.
[0022] Furthermore, the wall of the screening drum is made of stainless steel, and the spiral guide ribs are fixedly connected to the inner wall of the screening drum by welding.
[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the cylinder wall of the screening drum with stainless steel, the corrosion and wear of the cylinder wall by the material during the screening process is effectively solved, and the service life of the equipment is extended. At the same time, the spiral guide ribs are fixedly connected to the inner wall of the screening drum by welding, which ensures the firmness and reliability of the connection and avoids the loosening and falling off problems that may occur with bolted connections. The welding connection also eliminates the gaps at the connection, preventing the blockage and cleaning difficulties caused by the accumulation of material in the gaps.
[0024] Furthermore, the support frame is provided with an adjustment mechanism, which is used to adjust the tilt angle of the screening drum relative to the horizontal plane. The adjustment range of the tilt angle is -5° to +15°.
[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting an adjustment mechanism on the support frame to adjust the tilt angle of the screening drum relative to the horizontal plane, and limiting the adjustment range to -5° to +15°, the screening component can flexibly adjust the material's feeding speed and residence time according to the characteristics of different materials and screening requirements. The negative angle is suitable for materials with good flowability, and the positive angle is suitable for materials with poor flowability. This adjustable design greatly expands the application range of the screening component and improves the equipment's versatility and practical value.
[0026] Compared with existing technologies, the beneficial effects of the drum-type screening component of the magnetic separator provided by this utility model are as follows: This utility model fundamentally solves the problems of uneven material distribution and uncontrollable propulsion speed in existing technologies by setting spiral guide ribs with specific cross-sectional shapes and spiral helix angles on the inner wall of the screening drum, combined with the optimized design of diamond-shaped screen holes and an adjustable tilt angle support structure. It achieves uniform distribution and controllable propulsion of materials in the drum. The right-angled triangular cross-section design of the spiral guide ribs allows the material to tumble fully while being pushed, greatly increasing the contact opportunity between the material and the screen holes and significantly improving screening efficiency. The structure of the diamond-shaped screen holes not only reduces material jamming but also enhances the strength of the drum wall and extends the service life of the equipment. The decreasing height design of the guide ribs and the adjustable tilt angle allow the screening component to adapt to materials with different characteristics and different process requirements, greatly expanding the application range. The overall structural design is reasonable, and it is easy to manufacture and maintain. Compared with existing technologies, it has significant advantages such as high screening efficiency, strong adaptability, long service life, and low maintenance costs, providing a high-performance screening solution for magnetic separators. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a drum-type screening component of a magnetic separator.
[0029] Figure 2 A cross-sectional view of a drum-type screening component of a magnetic separator;
[0030] Figure 3 A top view of a drum-type screening component of a magnetic separator;
[0031] The attached diagram lists the components represented by each number as follows:
[0032] 1. Screening drum; 11. Screen holes; 12. Spiral guide ribs; 13. Feed inlet; 2. Support frame; 21. Drive mechanism. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0034] like Figures 1-3 The diagram shows a first embodiment of a drum-type screening component of a magnetic separator provided by this utility model. In this embodiment, it is used for grading and screening materials. It includes a screening drum 1 and a support frame 2. The two ends of the screening drum are rotatably connected to the support frame through bearing seats. Multiple screen holes 11 are evenly opened on the circumferential direction of the drum wall. Multiple spiral guide ribs 12 are arranged axially on the inner wall of the screening drum. The cross-section of the spiral guide ribs is a right-angled triangle. The inclined surface of the spiral guide ribs faces the feed end of the screening drum. The vertical surface of the spiral guide ribs makes an angle of 75° to 85° with the radial direction of the inner wall of the screening drum. A feed inlet 13 is provided at the center of the feed end face of the screening drum. A drive mechanism 21 is provided on the support frame. The drive mechanism is connected to one end of the screening drum and is used to drive the screening drum to rotate around its axis.
[0035] In the above technical solution, the spiral helix angle of the spiral guide rib along the axial direction of the screening drum is 8° to 15°.
[0036] Furthermore, in the above technical solution, the screen holes are rhomboid in shape, with the long diagonal of the screen holes parallel to the axial direction of the screening drum, and the short diagonal of the screen holes perpendicular to the axial direction of the screening drum.
[0037] Furthermore, in the above technical solution, the height of the spiral guide ribs gradually decreases from the feed end to the discharge end along the axial direction of the screening drum.
[0038] Furthermore, in the above technical solution, the distance between two adjacent spiral guide ribs along the circumference of the screening drum is greater than the maximum height of a single spiral guide rib along the radial direction of the screening drum.
[0039] Furthermore, in the above technical solution, the wall thickness of the screening drum is uniformly distributed along the axial direction, and the edges of the screen holes are rounded and chamfered.
[0040] Furthermore, in the above technical solution, the bearing housing is fixedly connected to the support frame via a flange, and multiple bolt holes are evenly provided on the flange along the circumference.
[0041] Furthermore, in the above technical solution, in the right-angled triangular cross-section of the spiral guide rib, the height of the vertical surface is greater than the width of the bottom surface of the spiral guide rib.
[0042] Furthermore, in the above technical solution, the cylinder wall of the screening drum is made of stainless steel, and the spiral guide ribs are fixedly connected to the inner wall of the screening drum by welding.
[0043] Furthermore, in the above technical solution, an adjustment mechanism is provided on the support frame. The adjustment mechanism is used to adjust the tilt angle of the screening drum relative to the horizontal plane. The adjustment range of the tilt angle is -5° to +15°.
[0044] The following is a specific embodiment 1 of this utility model: In this embodiment, the screening drum is made of 304 stainless steel plate with a thickness of 5mm, rolled and welded. The outer diameter of the drum is 800mm and the length is 2000mm. Diamond-shaped screen holes with a diameter of 12mm are evenly opened on the circumferential direction of the drum wall. The long diagonal of the diamond-shaped screen hole is 18mm and the short diagonal is 12mm. The center distance between the screen holes is 25mm. The edges of the screen holes are rounded with a radius of 2mm. Six spiral guide ribs are evenly distributed on the inner wall of the screening drum along the axial direction. The distance between two adjacent spiral guide ribs is circumferential. The included angle is 60°. Each spiral guide rib is cold-bent from 8mm thick Q235 steel plate and then fixed to the cylinder wall by argon arc welding. The cross-section of the spiral guide rib is a right-angled triangle. At the feed end, the vertical height of the spiral guide rib is 120mm and the bottom width is 80mm. Along the cylinder axis towards the discharge end, the height of the spiral guide rib gradually decreases at a rate of 15mm / m, dropping to 90mm at the discharge end. The spiral helix angle of the spiral guide rib is 12°, and the included angle between the vertical plane and the radial direction of the cylinder wall is 80°. Both ends of the screening cylinder are connected to bearing seats via an 80mm diameter main shaft. The bearing housing uses an external spherical bearing, model UCP316. The bearing housing is fixed to the support frame via a cast steel flange. The flange has an outer diameter of 250mm and a thickness of 20mm. Eight 18mm diameter bolt holes are evenly spaced along the circumference of the flange (200mm diameter). M16 high-strength bolts are used to secure the flange to the support frame. The support frame is welded from 40mm × 80mm rectangular steel pipes, providing a stable and robust frame structure. An adjustment mechanism is located on one side of the support frame, consisting of a screw-lift device and a locking nut. Rotating the screw allows for adjustment of the support... The height of one end of the frame is adjusted to change the tilt angle of the screening drum, with an adjustment range of -5° to +15°. The drive mechanism consists of a 3kW three-phase asynchronous motor, a reducer, and a chain drive. The motor speed is reduced to 25r / min by the reducer, and then the power is transmitted to the screening drum through the chain. In actual use, this screening component can effectively process ore materials with a particle size range of 5mm to 50mm. It has high screening efficiency, stable operation, and can meet the production requirements of 50t to 80t per day. The equipment has a compact structure, small footprint, convenient maintenance, and long service life.
[0045] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, but the number of spiral guide ribs on the inner wall of the screening drum is increased to 8, the circumferential angle between two adjacent spiral guide ribs is adjusted to 45°, the spiral rise angle of the spiral guide ribs is adjusted to 10°, and the angle between the vertical plane and the radial direction of the drum wall is adjusted to 78°. This improvement further increases the tumbling frequency of the material in the drum, and the screening efficiency is correspondingly improved. It is particularly suitable for processing dry materials with good flowability. At the same time, the size of the screen holes is adjusted to a rhombus with a long diagonal of 16mm and a short diagonal of 10mm, and the number of screen holes is increased accordingly, making the screening component more suitable for grading and screening materials with finer particle size requirements. In practical applications, it has a good screening effect on materials with a particle size range of 3mm to 40mm, and the daily processing capacity can reach 60t to 100t. The equipment operates more stably, the screening accuracy is higher, and it can meet the production process requirements with stricter particle size requirements.
[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1, but the outer diameter of the screening drum is increased to 1000mm, the length to 2500mm, and the drum wall thickness to 6mm to improve the equipment's processing capacity and structural strength. Simultaneously, the vertical height of the spiral guide ribs at the feed end is increased to 150mm, the bottom width to 100mm, the spiral helix angle is adjusted to 13°, and the height reduction ratio is adjusted to a decrease of 20mm per meter. This improvement enables the screening assembly to process larger batches of material, making it particularly suitable for production in large mines and mineral processing plants. To meet the demands, the size of the diamond-shaped screen holes was adjusted to 20mm on the long diagonal and 14mm on the short diagonal, and the center distance between the screen holes was increased to 30mm. This makes it suitable for screening coarse particles ranging from 8mm to 60mm. The power of the motor in the drive mechanism was increased to 5.5kW, and the output speed of the reducer was adjusted to 20r / min. The bearing housing uses UCP318 spherical bearings to withstand greater radial loads. The daily processing capacity of this large screening assembly can reach 100t to 150t. The overall performance of the equipment is stable and reliable, with a long maintenance cycle, and it can meet the requirements of large-scale industrial production.
[0047] Specifically, the principle of this utility model is as follows: The core principle of this utility model lies in setting spiral guide ribs with specific geometric parameters along the axial direction on the inner wall of the screening drum. Utilizing the guiding effect of the spiral structure and the thrust generated by the drum rotation, controllable axial propulsion and full tumbling of the material are achieved. When the screening drum rotates, the material moves along the inclined surface of the spiral guide ribs towards the discharge end under the combined action of gravity, centrifugal force, and the thrust of the spiral guide ribs. The right-angled triangular cross-section design of the spiral guide ribs ensures that the material is continuously blocked and lifted by the vertical surface as it slides down the inclined surface, forming a continuous tumbling motion. This tumbling motion greatly increases the contact frequency and contact area between the material particles and the screen holes, significantly improving screening efficiency. The spiral helix angle is controlled within the range of 8° to 15°, ensuring that the material has both sufficient axial propulsion speed to avoid accumulation and sufficient residence time for full screening. The vertical surface of the spiral guide ribs... The design, with a radial angle of 75° to 85° with the cylinder wall, ensures the material lifting height while avoiding material backflow due to an excessively large angle or insufficient lifting due to an excessively small angle. The arrangement of the long diagonal of the diamond-shaped screen holes parallel to the cylinder axis conforms to the main direction of material movement, reducing the resistance when the material passes through the screen holes. The rounded chamfer transition at the edge of the screen holes further reduces the frictional resistance when the material passes through. The design of the spiral guide ribs gradually decreasing in height from the feed end to the discharge end adapts to the actual situation of the gradually decreasing material volume, reducing the structural weight while ensuring the pushing effect. The reasonable spacing between adjacent spiral guide ribs ensures sufficient tumbling space for the material, avoiding the material being squeezed. The entire technical solution, through the precise design of structural parameters and the synergistic effect of various mechanical effects, fundamentally solves the problems of uneven material distribution and uncontrollable propulsion, achieving a highly efficient and stable screening effect.
[0048] The specific operation or use method of this utility model is as follows: First, according to the characteristics and particle size requirements of the material to be screened, adjust the tilt angle of the screening drum relative to the horizontal plane using the adjustment mechanism on the support frame. For dry materials with good flowability, adjust the tilt angle to a small angle of 0° to 5°; for materials with poor flowability or high moisture content, adjust the tilt angle to a larger angle of 10° to 15°. After adjustment, start the drive mechanism to make the screening drum rotate around its axis at a set speed, generally controlled between 15 and 30 r / min. Then, continuously and evenly feed the material to be screened into the screening drum through the feed inlet. After entering the drum, the material is pushed axially towards the discharge end under the action of the spiral guide ribs, while the drum rotates... Under the lifting action of the guide ribs, the material continuously tumbles, and fine particles smaller than the screen aperture fall through the diamond-shaped screen holes into the collection device below the screening drum. Coarse particles larger than the screen aperture continue to advance along the drum axis until they are discharged from the outlet. During the screening process, the feeding should be continuous and uniform to avoid the accumulation of material in the drum caused by a large amount of material feeding at any time. At the same time, the particle size distribution of the undersize and oversize materials should be observed regularly. If necessary, the drum speed or tilt angle can be finely adjusted to optimize the screening effect. After continuous operation for a period of time, the machine should be stopped to check whether there is any blockage in the screen holes. If there is any blockage, it should be cleaned in time. After long-term use, the working condition of the bearing housing and drive mechanism should be checked, and lubricating grease should be added in time to ensure that the equipment is always in good working condition.
Claims
1. A drum-type screening component of a magnetic separator for grading and screening materials, comprising a screening drum and a support frame, wherein both ends of the screening drum are rotatably connected to the support frame via bearing seats, a plurality of screen holes are uniformly opened circumferentially on the drum wall, and a plurality of spiral guide ribs are arranged axially on the inner wall of the screening drum, wherein the cross-section of the spiral guide ribs is a right-angled triangle, the inclined surface of the spiral guide ribs faces the feed end of the screening drum, and the angle between the vertical surface of the spiral guide ribs and the radial direction of the inner wall of the screening drum is 75° to 85°, wherein a feed inlet is provided at the center of the feed end face of the screening drum, and a drive mechanism is provided on the support frame, the drive mechanism being drivenly connected to one end of the screening drum for driving the screening drum to rotate around its axis.
2. The drum-type screening component of a magnetic separator according to claim 1, characterized in that, The spiral helix angle of the spiral guide rib along the axial direction of the screening drum is 8° to 15°.
3. The drum-type screening component of a magnetic separator according to claim 2, characterized in that, The sieve holes are rhomboid in shape, with the long diagonal of the sieve holes parallel to the axial direction of the screening drum, and the short diagonal of the sieve holes perpendicular to the axial direction of the screening drum.
4. The drum screening assembly of a magnetic separator according to claim 3, characterized in that, The height of the spiral guide ribs gradually decreases from the feed end to the discharge end along the axial direction of the screening drum.
5. The drum screening assembly of a magnetic separator according to claim 4, characterized in that, The spacing between two adjacent spiral guide ribs along the circumference of the screening drum is greater than the maximum height of a single spiral guide rib along the radial direction of the screening drum.
6. The drum screening assembly of a magnetic separator according to claim 5, characterized in that, The wall thickness of the screening drum is uniformly distributed along the axial direction, and the edges of the screen holes are rounded and chamfered.
7. The drum screening assembly of a magnetic separator according to claim 6, characterized in that, The bearing housing is fixedly connected to the support frame via a flange, and the flange has multiple bolt holes evenly distributed along its circumference.
8. The drum screening assembly of a magnetic separator according to claim 7, characterized in that, In the right-angled triangular cross-section of the spiral guide rib, the height of the vertical surface is greater than the width of the bottom surface of the spiral guide rib.
9. The drum screening assembly of a magnetic separator according to claim 8, characterized in that, The screen drum wall is made of stainless steel, and the spiral guide ribs are fixedly connected to the inner wall of the screen drum by welding.
10. The drum-type screening assembly of a magnetic separator according to claim 9, characterized in that, The support frame is equipped with an adjustment mechanism, which is used to adjust the tilt angle of the screening drum relative to the horizontal plane. The adjustment range of the tilt angle is -5° to +15°.