A composite force field dense medium cyclone

Abstract

The present application relates to a kind of composite force field heavy medium cyclone, belong to coal separation equipment technical field, including cyclone middle section pipe, two cover plates are respectively horizontally arranged in the both ends of cyclone middle section pipe, overflow discharge pipe is vertically arranged in the cover plate on the top of cyclone middle section pipe, inner magnetic pole center core is vertically arranged in the just below of overflow discharge pipe, annular excitation coil is horizontally sleeved in the outer side of inner magnetic pole center core away from the one end of overflow discharge pipe, the present application is by cyclone middle section pipe and its inside inner magnetic pole center core and annular excitation coil cooperation constitutes circumferential type outer magnetic pole, so that heavy medium magnetic particle receives radial inward magnetic field force, by adjusting the input current size of annular excitation coil, the size of radial magnetic field force that heavy medium magnetic particle receives is changed, to regulate and control the distribution of magnetic particle in the inside of cyclone middle section pipe, weaken the density gradient of heavy medium suspension in radial direction, improve the separation precision of heavy medium cyclone.

Description

Technical Field

[0001] This invention belongs to the technical field of coal sorting equipment, specifically relating to a composite force field heavy medium cyclone. Background Technology

[0002] A heavy medium hydrocyclone is a device that utilizes centrifugal force to enhance the separation of materials in a heavy medium suspension, and it is widely used in the coal preparation industry. Within a heavy medium hydrocyclone, due to centrifugal concentration and gravity, the heavy medium suspension inevitably exhibits a density gradient distribution in the radial direction of the hydrocyclone. This makes it difficult to control the actual separation density, reducing the separation accuracy and affecting the overall separation effect.

[0003] In the coal industry, adjusting the separation effect of heavy medium cyclones mainly involves two aspects. One aspect is adjusting structural parameters, such as changing the size of the underflow orifice. However, this requires stopping production, which not only affects the separation efficiency but also presents significant practical difficulties. The other aspect is adjusting operating conditions, such as changing the feed pressure. While this can adjust the density range of the heavy medium suspension and thus regulate the separation density of the heavy medium cyclone, a density gradient still exists in the radial direction of the cyclone. This not only fails to improve the separation accuracy of the heavy medium cyclone but also, with the increased feed pressure, further exacerbates the wear on the inner wall of the cyclone, reducing its service life.

[0004] Currently, to address the problems encountered in adjusting the sorting effect of heavy medium cyclones, many scholars have applied magnetic fields to heavy medium cyclones. For example, South African scholar J. Svoboda et al. designed a magnetic cyclone with a coil wound along the axial direction of the heavy medium cyclone. By changing the magnitude of the excitation current and the placement of the coil, the direction and magnitude of the resultant force acting on the magnetic particles can be altered, making its axial direction point towards the center of the coil plane. However, this only adjusts the sorting density in the axial direction of the heavy medium cyclone and cannot improve the density gradient in the radial direction, resulting in low sorting accuracy of the heavy medium cyclone. Summary of the Invention

[0005] In view of this, the present invention provides a composite force field heavy medium cyclone separator. The cyclone separator's middle section tube, along with its internal magnetic pole center core and annular excitation coil, forms a circumferential external magnetic pole. This enables the formation of a high-gradient, high-intensity magnetic field within the middle section tube, subjecting the heavy medium magnetic particles to a combined effect of radial inward magnetic force, centrifugal force, pressure differential resistance, and fluid drag. By adjusting the input current of the annular excitation coil, the magnetic field strength at various points within the middle section tube and the magnitude of the radial magnetic force on the heavy medium magnetic particles are altered. This allows for the regulation of the magnetic particle distribution within the middle section tube, weakening the radial density gradient of the heavy medium suspension, and ultimately improving the sorting accuracy of the heavy medium cyclone separator.

[0006] The technical solution of this invention is: a composite force field heavy medium cyclone, comprising a cyclone middle section tube, two cover plates, an overflow discharge pipe, an inner magnetic pole center core, and a ring excitation coil; the two cover plates are respectively horizontally arranged at both ends of the cyclone middle section tube, and the cover plates are connected to the cyclone middle section tube; the overflow discharge pipe is vertically inserted through the cover plate located at the top of the cyclone middle section tube, the overflow discharge pipe is coaxial with the cyclone middle section tube, the overflow discharge pipe is fixedly connected to the cover plate, and one end of the overflow discharge pipe is connected to the cyclone middle section tube. The internal connection is such that the inner magnetic pole center iron core is vertically set directly below the overflow discharge pipe. The inner magnetic pole center iron core is coaxial with the middle section pipe of the hydrocyclone. The bottom of the inner magnetic pole center iron core extends through the cover plate to the outside of the middle section pipe of the hydrocyclone. The inner magnetic pole center iron core and the middle section pipe of the hydrocyclone are made of soft magnetic material. The annular excitation coil is horizontally sleeved on the outside of the end of the inner magnetic pole center iron core away from the overflow discharge pipe. The annular excitation coil is coaxial with the inner magnetic pole center iron core and is electrically connected to the external power supply.

[0007] Preferably, a mounting barrel is vertically installed at the bottom of the hydrocyclone's middle section tube. The mounting barrel is coaxial with the middle section tube of the hydrocyclone, and the opening of the mounting barrel is connected to the bottom of the middle section tube of the hydrocyclone. The annular excitation coil is located inside the mounting barrel. The annular excitation coil has gaps with the side wall of the mounting barrel, the outer side of the inner magnetic pole center iron core, and the bottom of the cover plate on the side away from the overflow discharge pipe. The annular excitation coil is connected to the inner bottom of the mounting barrel, and the end of the inner magnetic pole center iron core away from the overflow discharge pipe is connected to the inner bottom of the mounting barrel. The mounting barrel is made of soft magnetic material.

[0008] Preferably, the upper diameter of the hydrocyclone middle section tube is larger than the lower diameter. A lower section tube is vertically installed between the hydrocyclone middle section tube and the installation barrel. The lower section tube is coaxial with the hydrocyclone middle section tube and has the same bottom diameter. One end of the lower section tube is fixedly connected to the bottom of the hydrocyclone middle section tube through a first flange group, and the other end is fixedly connected to the opening of the installation barrel through a second flange group. The cover plate on the side away from the overflow discharge pipe is fixedly connected to the inner wall of the lower section tube. The cover plate is flush with the bottom end face of the lower section tube. A discharge pipe is horizontally installed on the outside of the lower section tube. The discharge pipe is tangent to the lower section tube. One end of the discharge pipe is fixedly connected to the lower side of the lower section tube. The discharge pipe communicates with the interior of the lower section tube. The material of the lower section tube is a soft magnetic material.

[0009] Preferably, the cone angle 2α of the middle section tube of the hydrocyclone is 0 to 10°.

[0010] Preferably, an upper section pipe is vertically installed at the top of the middle section pipe of the hydrocyclone. The upper section pipe is coaxial with the middle section pipe of the hydrocyclone and has the same top diameter. One end of the upper section pipe is fixedly connected to the top of the middle section pipe of the hydrocyclone through a third flange assembly. A cover plate on the side away from the discharge pipe is fixedly connected to the inner wall of the upper section pipe. The cover plate is flush with the top end face of the upper section pipe. A feed pipe is horizontally installed on the outside of the upper section pipe. The feed pipe is tangent to the upper section pipe. One end of the feed pipe is fixedly connected to the upper side of the upper section pipe. The feed pipe communicates with the interior of the upper section pipe. The central axes of the feed pipe and the discharge pipe are perpendicular to each other. The upper section pipe, cover plate, overflow discharge pipe, feed pipe, and discharge pipe are all made of non-magnetic materials.

[0011] Preferably, the upper diameter of the inner magnetic pole center core is larger than the lower diameter. A cylinder is vertically provided at the end of the inner magnetic pole center core away from the overflow discharge pipe. The cylinder is coaxial with the inner magnetic pole center core. One end of the cylinder is fixedly connected to the inner magnetic pole center core and has the same bottom diameter as it. The other end passes through the cover plate and extends into the interior of the installation barrel. The cylinder is fixedly connected to the inner bottom of the installation barrel. The end face of the inner magnetic pole center core away from the cylinder is flush with the top end face of the middle section pipe of the hydrocyclone.

[0012] Preferably, the cylinder is sealed to the cover plate by an annular sealing ring.

[0013] Preferably, the ratio of the top end face diameter of the inner magnetic pole center core to the diameter of the cylinder is 1 to 1.5, and the ratio of the top end face diameter of the inner magnetic pole center core to the inner diameter of the overflow discharge pipe is 0.25 to 0.35:1.

[0014] Compared with existing technologies, the present invention provides a composite force field heavy medium cyclone separator. Through the combination of the middle section tube of the cyclone separator, the central iron core of the inner magnetic pole, and the annular excitation coil to form a circumferential outer magnetic pole, a high-gradient, high-intensity magnetic field is generated inside the middle section tube. This causes the magnetic particles of the heavy medium to be subjected to a combined effect of radial inward magnetic force, centrifugal force, pressure difference resistance, and fluid drag. By adjusting the input current of the annular excitation coil, the magnetic field strength at various points inside the middle section tube and the magnitude of the radial magnetic force on the magnetic particles of the heavy medium are changed, thereby controlling the distribution of magnetic particles inside the middle section tube, weakening the density gradient of the heavy medium suspension in the radial direction, and thus improving the sorting accuracy of the heavy medium cyclone separator. The cyclone separator of the present invention has high sorting accuracy, continuous and independent density adjustment, strong practicality, and is worthy of promotion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 This is a cross-sectional view of the present invention (AA section).

[0017] Figure 3 This is a BB cross-sectional view of the present invention;

[0018] Figure 4 This is a schematic diagram of the core structure of the inner magnetic pole center of the present invention. Detailed Implementation

[0019] This invention provides a composite force field heavy medium cyclone, which is described below in conjunction with... Figures 1 to 4 The present invention is illustrated by the structural diagram shown below.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] A heavy medium hydrocyclone is a device that utilizes centrifugal force to enhance the separation of materials in a heavy medium suspension, and it is widely used in the coal preparation industry. Within a heavy medium hydrocyclone, due to centrifugal concentration and gravity, the heavy medium suspension inevitably exhibits a density gradient distribution in the radial direction of the hydrocyclone. This makes it difficult to control the actual separation density, reducing the separation accuracy and affecting the overall separation effect.

[0022] In the coal industry, adjusting the separation effect of heavy medium cyclones mainly involves two aspects. One aspect is adjusting structural parameters, such as changing the size of the underflow orifice. However, this requires stopping production, which not only affects the separation efficiency but also presents significant practical difficulties. The other aspect is adjusting operating conditions, such as changing the feed pressure. While this can adjust the density range of the heavy medium suspension and thus regulate the separation density of the heavy medium cyclone, a density gradient still exists in the radial direction of the cyclone. This not only fails to improve the separation accuracy of the heavy medium cyclone but also, with the increased feed pressure, further exacerbates the wear on the inner wall of the cyclone, reducing its service life.

[0023] Currently, to address the problems encountered in adjusting the sorting effect of heavy medium cyclones, many scholars have applied magnetic fields to heavy medium cyclones. For example, South African scholar J. Svoboda et al. designed a magnetic cyclone with a coil wound along the axial direction of the heavy medium cyclone. By changing the magnitude of the excitation current and the placement of the coil, the direction and magnitude of the resultant force acting on the magnetic particles can be altered, making its axial direction point towards the center of the coil plane. However, this only adjusts the sorting density in the axial direction of the heavy medium cyclone and cannot improve the density gradient in the radial direction, resulting in low sorting accuracy of the heavy medium cyclone.

[0024] To address the aforementioned issues, this invention provides a composite force field heavy medium cyclone separator. By combining the middle section tube of the cyclone separator with its internal magnetic pole center core and annular excitation coil to form a circumferential outer magnetic pole, a high-gradient, high-intensity magnetic field is generated inside the middle section tube. This causes the heavy medium magnetic particles to be subjected to a combination of radial inward magnetic force, centrifugal force, pressure difference resistance, and fluid drag. By adjusting the input current of the annular excitation coil, the magnetic field strength at various points inside the middle section tube and the magnitude of the radial magnetic force on the heavy medium magnetic particles are changed, thereby controlling the distribution of magnetic particles inside the middle section tube, weakening the density gradient of the heavy medium suspension in the radial direction, and thus improving the sorting accuracy of the heavy medium cyclone separator.

[0025] Example 1

[0026] like Figure 1As shown, a composite force field heavy medium cyclone includes a cyclone middle section tube 1, two cover plates 2, an overflow discharge pipe 3, an inner magnetic pole center core 4, and a ring excitation coil 5. The two cover plates 2 are horizontally positioned at both ends of the cyclone middle section tube 1 and connected to it. The overflow discharge pipe 3 is vertically inserted through the cover plate 2 located at the top of the cyclone middle section tube 1, coaxial with the cyclone middle section tube 1, and fixedly connected to the cover plate 2. One end of the overflow discharge pipe 3 communicates with the interior of the cyclone middle section tube 1. The inner magnetic pole center iron core 4 is vertically set directly below the overflow discharge pipe 3. The inner magnetic pole center iron core 4 is coaxial with the middle section pipe 1 of the hydrocyclone. The bottom of the inner magnetic pole center iron core 4 extends through the cover plate 2 to the outside of the middle section pipe 1 of the hydrocyclone. The inner magnetic pole center iron core 4 and the middle section pipe 1 of the hydrocyclone are made of soft magnetic materials, including silicon steel, iron core, etc. The annular excitation coil 5 is horizontally sleeved on the outside of the end of the inner magnetic pole center iron core 4 away from the overflow discharge pipe 3. The annular excitation coil 5 is coaxial with the inner magnetic pole center iron core 4 and is electrically connected to an external power supply.

[0027] Preferably, the cylinder 61 is sealed to the cover plate 2 by an annular sealing ring 71.

[0028] In operation, the composite force field heavy medium cyclone of the present invention feeds the selected material and the magnetite powder suspension slurry into the middle section tube 1 of the cyclone through the tangential feed pipe 53 at a certain pressure, forming a rotating flow inside the middle section tube 1. Simultaneously, current is supplied to the annular excitation coil 5, magnetizing the inner magnetic pole center core 4 and the circumferential outer magnetic poles (middle section tube 1, lower section tube 31, and mounting tank 21). Due to the significant difference in area between the circumferential outer magnetic poles and the inner magnetic pole center core 4, a high-gradient, high-intensity magnetic field is generated inside the middle section tube 1. The magnetic field strength increases radially with the radius of the middle section tube 1. The radial magnetic force on the magnetic particles of the heavy medium is controlled by changing the current, thereby weakening the concentration effect of magnetite powder in the suspension caused by centrifugal force. This makes the working suspension density approximately uniform, and the light and heavy products are precisely separated according to density. The light products move upward along the central axis with the inner spiral flow and are discharged from the overflow discharge pipe 3, while the heavy products move downward along the inner wall of the middle section pipe 1 of the hydrocyclone with the outer spiral flow and are discharged tangentially from the discharge pipe 34. At the same time, the iron core 4 at the center of the inner magnetic pole can stabilize the central air column of the hydrocyclone and weaken the adverse effect of air column instability on the sorting accuracy.

[0029] Example 2

[0030] To further improve sorting accuracy, a soft magnetic mounting bucket is used in conjunction with a ring-shaped excitation coil and an inner magnetic pole center core. This not only better concentrates the magnetism of the hydrocyclone's middle section tube and the magnetic poles formed by the inner magnetic pole center core, increasing the magnetic field strength on the middle section tube, but also ensures that the inner magnetic pole center core, fixed at the bottom center of the mounting bucket, will not interfere with the overflow discharge pipe. Furthermore, the inner magnetic pole center core can stabilize the central air column of the hydrocyclone's middle section tube, mitigating the adverse effects of air column instability on material sorting.

[0031] Preferably, a mounting barrel 21 is vertically provided at the bottom of the hydrocyclone middle section tube 1. The mounting barrel 21 is coaxial with the hydrocyclone middle section tube 1. The opening of the mounting barrel 21 is connected to the bottom of the hydrocyclone middle section tube 1. The annular excitation coil 5 is located inside the mounting barrel 21. The annular excitation coil 5 is provided with gaps to the side wall of the mounting barrel 21, the outer side of the inner magnetic pole center iron core 4, and the bottom of the cover plate 2 on the side away from the overflow discharge pipe 3. The annular excitation coil 5 is connected to the inner bottom of the mounting barrel 21. The end of the inner magnetic pole center iron core 4 away from the overflow discharge pipe 3 is connected to the inner bottom of the mounting barrel 21. The material of the mounting barrel 21 is a soft magnetic material.

[0032] Example 3

[0033] To further improve the ease of use in sorting, the hydrocyclone middle section tube with a cone angle of 2α of 0 to 10° ensures that light products can be smoothly discharged from the overflow discharge pipe, while reducing the concentration of heavy media inside the hydrocyclone middle section tube, effectively reducing the content of mismatched light and heavy products. In addition, the lower section tube with soft magnets is used in conjunction with circumferential external magnetic poles, which can not only further concentrate magnetism, but also the discharge pipe tangentially set on the lower section tube and the feed pipe on the upper section tube work together to allow the material to enter the hydrocyclone middle section tube spirally and tangentially through the feed pipe and be smoothly discharged through the discharge pipe.

[0034] Preferably, the upper diameter of the hydrocyclone middle section pipe 1 is larger than the lower diameter. A lower section pipe 31 is vertically arranged between the hydrocyclone middle section pipe 1 and the mounting barrel 21. The lower section pipe 31 is coaxial with the hydrocyclone middle section pipe 1 and has the same bottom diameter. One end of the lower section pipe 31 is fixedly connected to the bottom of the hydrocyclone middle section pipe 1 through the first flange group 32, and the other end is fixedly connected to the opening of the mounting barrel 21 through the second flange group 33. The cover plate 2 on the side away from the overflow discharge pipe 3 is welded and fixedly connected to the inner wall of the lower section pipe 31. The cover plate 2 is flush with the bottom end face of the lower section pipe 31. A discharge pipe 34 is horizontally arranged on the outside of the lower section pipe 31. The discharge pipe 34 is tangent to the lower section pipe 31. One end of the discharge pipe 34 is fixedly connected to the lower side of the lower section pipe 31. The discharge pipe 34 communicates with the interior of the lower section pipe 31. The material of the lower section pipe 31 is a soft magnetic material.

[0035] Preferably, the cone angle 2α of the middle section tube 1 of the hydrocyclone is 0 to 10°.

[0036] Preferably, an upper section pipe 51 is vertically installed at the top of the hydrocyclone intermediate section pipe 1. The upper section pipe 51 is coaxial with the hydrocyclone intermediate section pipe 1 and has the same top diameter. One end of the upper section pipe 51 is fixedly connected to the top of the hydrocyclone intermediate section pipe 1 through a third flange assembly 52. ​​A cover plate 2 on the side away from the discharge pipe 34 is fixedly connected to the inner wall of the upper section pipe 51. The cover plate 2 is flush with the top end face of the upper section pipe 51. A feed pipe 53 is horizontally installed on the outer side of the upper section pipe 51. Pipe 53 is tangent to the upper section pipe 51. One end of the feed pipe 53 is fixedly connected to the upper side of the upper section pipe 51. The feed pipe 53 is internally connected to the upper section pipe 51. The central axes of the feed pipe 53 and the discharge pipe 34 are perpendicular to each other. The openings of the feed pipe 53 and the discharge pipe 34 are one of round, square or rectangular. The materials of the upper section pipe 51, cover plate 2, overflow discharge pipe 3, feed pipe 53 and discharge pipe 34 are non-magnetic materials, including aluminum, plexiglass, etc.

[0037] Example 4

[0038] To further improve the ease of use in sorting, the diameter ratio of the inner magnetic pole center iron core to the middle section conical tube is 1 to 1.5, making their shapes consistent. This generates a radial magnetic field inside the middle section tube of the hydrocyclone. At the same time, the ratio of the top end face diameter of the inner magnetic pole center iron core to the inner diameter of the overflow discharge pipe is 0.25 to 0.35:1, avoiding the inner magnetic pole center iron core from affecting the discharge of material from the overflow discharge pipe and the upper limit of the sorting particle size adjustment, so that the material can be discharged from the overflow discharge pipe more effectively.

[0039] Preferably, the upper diameter of the inner magnetic pole center core 4 is larger than the lower diameter. A cylinder 61 is vertically provided at the end of the inner magnetic pole center core 4 away from the overflow discharge pipe 3. The cylinder 61 is coaxial with the inner magnetic pole center core 4. One end of the cylinder 61 is fixedly connected to the inner magnetic pole center core 4 and has the same bottom diameter as it. The other end passes through the cover plate 2 and extends into the interior of the mounting barrel 21. The cylinder 61 is fixedly connected to the inner bottom of the mounting barrel 21. The end face of the inner magnetic pole center core 4 away from the cylinder 61 is flush with the top end face of the hydrocyclone middle section pipe 1.

[0040] Preferably, the ratio of the top end face diameter of the inner magnetic pole center core 4 to the diameter of the cylinder 61 is 1 to 1.5, and the ratio of the top end face diameter of the inner magnetic pole center core 4 to the inner diameter of the overflow discharge pipe 3 is 0.25 to 0.35:1.

[0041] The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A composite force field heavy medium cyclone, comprising: A hydrocyclone middle section tube (1) and two cover plates (2) are horizontally disposed at both ends of the hydrocyclone middle section tube (1), the cover plates (2) being connected to the hydrocyclone middle section tube (1), characterized in that it further includes: An overflow discharge pipe (3) is vertically installed on the cover plate (2) located at the top of the hydrocyclone middle section pipe (1). The overflow discharge pipe (3) is coaxial with the hydrocyclone middle section pipe (1). The overflow discharge pipe (3) is fixedly connected to the cover plate (2). One end of the overflow discharge pipe (3) is connected to the interior of the hydrocyclone middle section pipe (1). The inner magnetic pole center iron core (4) is vertically set directly below the overflow discharge pipe (3). The inner magnetic pole center iron core (4) is coaxial with the hydrocyclone middle section pipe (1). The bottom of the inner magnetic pole center iron core (4) extends through the cover plate (2) to the outside of the hydrocyclone middle section pipe (1). The inner magnetic pole center iron core (4) and the hydrocyclone middle section pipe (1) are made of soft magnetic material. A ring-shaped excitation coil (5) is horizontally sleeved on the outer side of the inner magnetic pole center iron core (4) away from the overflow discharge pipe (3). The ring-shaped excitation coil (5) is coaxial with the inner magnetic pole center iron core (4) and is electrically connected to an external power supply. The bottom of the hydrocyclone middle section tube (1) is vertically provided with an installation bucket (21). The installation bucket (21) is coaxial with the hydrocyclone middle section tube (1). The opening of the installation bucket (21) is connected to the bottom of the hydrocyclone middle section tube (1). The annular excitation coil (5) is located inside the installation bucket (21). The material of the installation bucket (21) is a soft magnetic material. A lower section pipe (31) is vertically arranged between the middle section pipe (1) of the hydrocyclone and the mounting barrel (21). A discharge pipe (34) is horizontally arranged on the outside of the lower section pipe (31). The discharge pipe (34) is tangent to the lower section pipe (31). One end of the discharge pipe (34) is fixedly connected to the lower side of the lower section pipe (31). The discharge pipe (34) is connected to the inside of the lower section pipe (31). An upper section pipe (51) is vertically arranged at the top of the middle section pipe (1) of the hydrocyclone. An inlet pipe (53) is horizontally arranged on the outside of the upper section pipe (51). The inlet pipe (53) is tangent to the upper section pipe (51). One end of the inlet pipe (53) is fixedly connected to the upper side of the upper section pipe (51). The inlet pipe (53) is connected to the inside of the upper section pipe (51). The central axes of the inlet pipe (53) and the discharge pipe (34) are perpendicular to each other. The upper diameter of the inner magnetic pole center iron core (4) is larger than the lower diameter. A cylinder (61) is vertically provided at the end of the inner magnetic pole center iron core (4) away from the overflow discharge pipe (3). The cylinder (61) is coaxial with the inner magnetic pole center iron core (4). One end of the cylinder (61) is fixedly connected to the inner magnetic pole center iron core (4) and has the same bottom diameter as it. The other end passes through the cover plate (2) and extends into the interior of the mounting barrel (21). The cylinder (61) is fixedly connected to the inner bottom of the mounting barrel (21).

2. The composite force field heavy medium cyclone according to claim 1, characterized in that, The annular excitation coil (5) has gaps with the side wall of the mounting barrel (21), the outer side of the inner magnetic pole center iron core (4), and the bottom of the cover plate (2) on the side away from the overflow discharge pipe (3). The annular excitation coil (5) is connected to the inner bottom of the mounting barrel (21), and the end of the inner magnetic pole center iron core (4) away from the overflow discharge pipe (3) is connected to the inner bottom of the mounting barrel (21).

3. A composite force field heavy medium cyclone according to claim 1, characterized in that, The upper diameter of the hydrocyclone middle section tube (1) is larger than the lower diameter. The lower section tube (31) is coaxial with the hydrocyclone middle section tube (1) and has the same bottom diameter. One end of the lower section tube (31) is fixedly connected to the bottom of the hydrocyclone middle section tube (1) through the first flange group (32), and the other end is fixedly connected to the opening of the mounting bucket (21) through the second flange group (33). The cover plate (2) on the side away from the overflow discharge pipe (3) is fixedly connected to the inner wall of the lower section tube (31). The cover plate (2) is flush with the bottom end face of the lower section tube (31). The material of the lower section tube (31) is a soft magnetic material.

4. A composite force field heavy medium cyclone according to claim 3, characterized in that, The cone angle 2α of the middle section tube (1) of the hydrocyclone is 0~10°.

5. A composite force field heavy medium cyclone according to claim 1, characterized in that, The upper section pipe (51) is coaxial with the middle section pipe (1) of the hydrocyclone and has the same top diameter. One end of the upper section pipe (51) is fixedly connected to the top of the middle section pipe (1) of the hydrocyclone through the third flange group (52). The cover plate (2) on the side away from the discharge pipe (34) is fixedly connected to the inner wall of the upper section pipe (51). The cover plate (2) is flush with the top end face of the upper section pipe (51). The upper section pipe (51), cover plate (2), overflow discharge pipe (3), feed pipe (53) and discharge pipe (34) are made of non-magnetic materials.

6. A composite force field heavy medium cyclone according to claim 1, characterized in that, The end face of the inner magnetic pole center core (4) away from the cylinder (61) is flush with the top end face of the middle section tube (1) of the hydrocyclone.

7. A composite force field heavy medium cyclone according to claim 6, characterized in that, The cylinder (61) is sealed to the cover plate (2) by an annular sealing ring (71).

8. A composite force field heavy medium cyclone according to claim 6, characterized in that, The ratio of the top end face diameter of the inner magnetic pole center core (4) to the diameter of the cylinder (61) is 1 to 1.5, and the ratio of the top end face diameter of the inner magnetic pole center core (4) to the inner diameter of the overflow discharge pipe (3) is 0.25 to 0.35:1.

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