Magnetic separation device

Abstract

This application relates to the field of water treatment technology and aims to solve the technical problem of low magnet recovery efficiency in magnetic separation devices. It provides a magnetic separation device comprising a housing, a magnetic drum assembly, a scraper assembly, and a first discharge component. The housing has a receiving cavity for inputting the material to be separated. The magnetic drum assembly is disposed in the receiving cavity and includes a rotating shaft and a first magnetic drum. The first magnetic drum includes a magnetic region and a non-magnetic region. The magnetic region is constructed as an arc-shaped structure with an opening, and the non-magnetic region is located at the opening and connected to both ends of the magnetic region. The magnetic region is provided with multiple magnets for adsorbing magnetic flocs in the material to be separated. The scraper assembly includes a mounting component and a flexible scraper. The mounting component is connected to the housing, and the flexible scraper is used to scrape off the magnetic flocs adsorbed in the magnetic region. The first discharge component is disposed on one side of the first magnetic drum along a second direction and has a first discharge channel with a first recovery port. The beneficial effect of this application is to improve the separation efficiency of the magnets.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and more specifically, to magnetic separation devices. Background Technology

[0002] In fields such as wastewater treatment and mineral processing, magnetic separation technology has attracted attention due to its high efficiency and small footprint. A typical magnetic separation device relies on a rotating magnetic drum to adsorb magnetic flocs in the fluid, and then a scraper removes the adsorbed magnetic flocs to achieve separation.

[0003] Some known magnetic separation devices suffer from magnetic flocculent residues in the magnetic drum, making it difficult to improve magnet recovery efficiency. Summary of the Invention

[0004] This application provides a magnetic separation device to solve the technical problem of low magnet recovery efficiency in known magnetic separation devices.

[0005] The embodiments of this application are implemented as follows: This application provides a magnetic separation device, comprising: a housing having a receiving cavity for receiving a substance to be separated; a magnetic drum assembly disposed in the receiving cavity, the magnetic drum assembly including a rotating shaft and a first magnetic drum, the rotating shaft being rotatably connected to the housing, the first magnetic drum being connected to the rotating shaft, the first magnetic drum including a magnetic region and a non-magnetic region, the magnetic region being constructed as an arc-shaped structure with an opening, the non-magnetic region being disposed at the opening and connected to both ends of the magnetic region; the magnetic region being provided with a plurality of magnets for adsorbing magnetic flocs in the substance to be separated; and a scraper assembly disposed radially along the rotating shaft on one side of the first magnetic drum along a first direction, the scraper assembly including... A mounting component and a flexible scraper are included. The mounting component is connected to the housing. The length direction of the flexible scraper is parallel to the axial direction of the rotating shaft. One end of the flexible scraper along its width direction is connected to the mounting component. The other end of the flexible scraper along its width direction abuts against the outer peripheral surface of the first magnetic drum and is used to scrape off the magnetic flocs adsorbed in the magnetic region. A first discharge component is provided on one side of the first magnetic drum along a second direction, which intersects the first direction. The first discharge component has a first discharge channel with a first recovery port, which is correspondingly provided at the end of the flexible scraper away from the mounting component. The first discharge component is used to scrape off the magnetic flocs by the flexible scraper.

[0006] According to the magnetic separation device of this application, a clear boundary of magnetic field strength is formed at the junction of the magnetic and non-magnetic regions along the circumference of the first magnetic drum. When the magnetic flocs move along the arc surface of the magnetic region to near this boundary, the magnetic force they experience weakens. At this time, the scraper assembly located in the first direction holds the outer circumferential surface of the magnetic drum with a flexible scraper, peeling off the flocs with relatively low scraping resistance. The peeled flocs fall into the first recovery port of the first discharge member located in the second direction. The second direction intersects with the first direction, allowing the flocs to directly enter the discharge channel after falling off the magnetic drum, avoiding falling back into the separation chamber. After the first magnetic drum passes the non-magnetic region, it re-enters the separation chamber with a clean surface, maintaining complete adsorption capacity in each cycle, thereby improving the recovery efficiency of the magnetic flocs.

[0007] In one possible implementation: The minimum distance between the outer peripheral surface of the non-magnetic region and the axis of the rotating shaft is D1, and the maximum distance between the outer peripheral surface of the magnetic region and the axis of the rotating shaft is D2, where D1 ≥ D2.

[0008] In one possible implementation: The receiving cavity has an inlet and an outlet arranged opposite to each other along a second direction; the magnetic separation device further includes a recovery assembly, which is disposed in the receiving cavity and located on both sides of the first discharge member along the first direction. The recovery assembly includes a recovery shaft and a second magnetic drum. The recovery shaft is rotatably connected to the housing, and the second magnetic drum is connected to the recovery shaft. The second magnetic drum and the outlet are arranged correspondingly along the second direction.

[0009] In one possible implementation: The magnetic separation device further includes a second discharge component, which has a second discharge channel and a second recovery port. The axis of the recovery shaft is located on the plane where the second recovery port is located. The second discharge component includes a clearance wall section and a flexible scraping wall section. The clearance wall section is connected to the flexible scraping wall section and forms the second recovery port. The distance between the clearance wall section and the axis of the recovery shaft is greater than the radius of the second magnetic drum. The distance between the scraping wall section and the axis of the recovery shaft is less than or equal to the radius of the second magnetic drum.

[0010] In one possible implementation: The receiving cavity has a liquid inlet; the magnetic separation device includes a filter assembly, which is disposed on the side of the receiving cavity near the liquid inlet, and the projection of the filter assembly along the second direction covers the liquid inlet. The filter assembly is used to filter or agitate the substance to be separated input from the liquid inlet.

[0011] In one possible implementation: The filter assembly includes a baffle and a guide plate. The baffle is disposed in the receiving cavity and is correspondingly arranged with respect to the liquid inlet. The guide plate is located on the side of the baffle away from the liquid inlet and is used to guide the material to be separated toward the magnetic drum assembly.

[0012] In one possible implementation: The magnetic region is provided with multiple magnets of different polarities arranged in an alternating manner; the outer circumferential surface of the non-magnetic region is provided with anti-magnetic covers on both sides of the non-magnetic region along the circumferential direction of the rotating shaft.

[0013] In one possible implementation: The scraper assembly further includes an elastic member, the two ends of which are respectively connected to the mounting member and the flexible scraper. The elastic member is used to apply an elastic force to the flexible scraper so that the flexible scraper remains against the outer peripheral surface of the magnetic drum.

[0014] In one possible implementation: The outer peripheral surface of the non-magnetic region is provided with a plurality of grooves, which extend along the axial direction of the rotating shaft and are spaced apart from each other along the circumferential direction of the rotating shaft. The side surface of the grooves is tangent to the outer peripheral surface of the magnetic drum.

[0015] In one possible implementation: The non-magnetic region includes multiple first sub-parts, multiple second sub-parts, and multiple elastic parts. The multiple sub-parts are arranged side by side along the circumference of the first magnetic drum and connected to the rotating shaft. The multiple second sub-parts are movably connected to the corresponding first sub-parts along the radial direction of the first magnetic drum. The two ends of each elastic part are respectively connected to the corresponding first sub-part and second sub-part. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a magnetic separation device according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure of a magnetic drum assembly according to another embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a magnetic drum assembly according to another embodiment of this application.

[0020] Explanation of key component symbols: 100. Magnetic separation device; 10. Housing; 11. Receiving cavity; 111. Liquid inlet; 112. Liquid outlet; 20. Magnetic drum assembly; 21. Rotating shaft; 22. First magnetic drum; 221. Magnetic zone; 222. Non-magnetic zone; 2221. First sub-section; 2222. Second sub-section; 2223. Elastic part; 2224. Guide groove; 2225. Guide part; 223. Groove; 30. Scraper assembly; 31. Mounting component; 32. 1. Flexible scraper; 33. Elastic component; 40. First discharge component; 41. First discharge channel; 42. First recovery port; 50. Recovery assembly; 51. Recovery shaft; 52. Second magnetic drum; 60. Second discharge component; 61. Second discharge channel; 62. Second recovery port; 63. Avoidance wall section; 64. Flexible scraping wall section; 70. Filter assembly; 71. Baffle; 72. Guide plate; X, first direction; Y, second direction; Z, axial direction.

[0021] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0023] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] See Figures 1 to 3This application provides a magnetic separation device 100, including a housing 10, a magnetic drum assembly 20, a scraper assembly 30, and a first discharge member 40. The housing 10 has a receiving cavity 11 for inputting the material to be separated. The magnetic drum assembly 20 is disposed in the receiving cavity 11 and includes a rotating shaft 21 and a first magnetic drum 22. The rotating shaft 21 is rotatably connected to the housing 10, and the first magnetic drum 22 is connected to the rotating shaft 21. The first magnetic drum 22 includes a magnetic region 221 and a non-magnetic region 222. The magnetic region 221 is constructed as an arc-shaped structure with an opening, and the non-magnetic region 222 is disposed in the opening and connected to both ends of the magnetic region 221. The magnetic region 221 is provided with a plurality of magnets for adsorbing magnetic flocs in the material to be separated. A scraper assembly 30 is radially disposed on one side of the first magnetic drum 22 along the first direction X along the rotating shaft 21. The scraper assembly 30 includes a mounting member 31 and a flexible scraper 32. The mounting member 31 is connected to the housing 10. The length direction of the flexible scraper 32 is parallel to the axial direction Z of the rotating shaft 21. One end of the flexible scraper 32 along its width direction is connected to the mounting member 31, and the other end of the flexible scraper 32 along its width direction abuts against the outer peripheral surface of the first magnetic drum 22 and is used to scrape off the magnetic flocs adsorbed in the magnetic region 221. A first discharge member 40 is disposed on one side of the first magnetic drum 22 along the second direction Y, which intersects the first direction X. The first discharge member 40 has a first discharge channel 41 with a first recovery port 42. The first recovery port 42 is correspondingly disposed at the end of the flexible scraper 32 away from the mounting member 31. The first discharge member 40 is used to scrape off the magnetic flocs removed by the flexible scraper 32.

[0027] According to the magnetic separation device 100 of this application embodiment, the first magnetic drum 22 forms a clear boundary of magnetic field strength at the junction of the magnetic region 221 and the non-magnetic region 222. When the magnetic flocs move along the arc surface of the magnetic region 221 to near this boundary, the magnetic force they experience weakens. At this time, the scraper assembly 30 provided in the first direction X holds the outer circumferential surface of the magnetic drum with the flexible scraper 32, and peels off the flocs with less scraping resistance. The peeled flocs fall into the first recovery port 42 of the first discharge member 40 provided in the second direction Y. The second direction Y intersects with the first direction X, so that the falling path of the flocs after leaving the magnetic drum directly enters the discharge channel, avoiding falling back into the separation body in the receiving cavity 11. After the first magnetic drum 22 rotates past the non-magnetic region 222, it re-enters the separation body with a clean surface, maintaining complete adsorption capacity in each cycle, thereby improving the recovery efficiency of the magnetic flocs.

[0028] Optionally, the flexible scraper 32 is made of a polymer composite material, such as a composite of polytetrafluoroethylene and polyurethane, and its surface can be coated with a nano-wear-resistant coating. An angle adjustment device can be provided at the connection between the flexible scraper 32 and the mounting component 31 to adjust the contact angle between the scraper and the outer peripheral surface of the magnetic drum. A slider mechanism can also be provided on the mounting component 31 to drive the flexible scraper 32 to reciprocate along the axial direction Z of the rotating shaft 21, ensuring uniform wear and pushing the flocs axially Z towards the recovery port. Guide wheels can also be provided at both ends of the flexible scraper 32 along the axial direction Z. These guide wheels roll along the outer peripheral surface of the magnetic drum, radially positioning the scraper and distributing pressure. The scraping end of the flexible scraper 32 can be designed as serrated, wavy, or with comb-like scraping strips to match the groove 223 for deeper scraping.

[0029] In some embodiments, the minimum distance between the outer peripheral surface of the non-magnetic region 222 and the axis of the rotating shaft 21 is D1, and the maximum distance between the outer peripheral surface of the magnetic region 221 and the axis of the rotating shaft 21 is D2, where D1 ≥ D2.

[0030] Thus, the surface of the non-magnetic region 222 is further away from the center of the rotating shaft. The distance at which the magnet in the magnetic region 221 interacts with the surface of the non-magnetic region 222 is increased, resulting in a more thorough attenuation of the magnetic field at that location. When the non-magnetic region 222 rotates to the corresponding position on the scraper assembly 30, the surface no longer has the conditions to adsorb magnetic flocs, further reducing the amount of flocs remaining in the non-magnetic region 222. The surface of the material to be separated after the magnetic drum passes through the non-magnetic region is cleaner, and the adsorption capacity of each cycle remains intact. Furthermore, the scraping resistance faced by the flexible scraper 32 when it abuts against the surface of the non-magnetic region 222 is significantly reduced. With reduced scraping resistance, the flexible scraper 32 requires only a smaller holding force to peel off surface residues. Wear at the scraper tip is reduced due to decreased contact pressure, and the scraper is less prone to deformation or thinning due to excessive wear during long-term operation, thus maintaining the fit between the scraper tip and the outer circumference of the magnetic drum.

[0031] In some embodiments, the scraper assembly 30 further includes an elastic member 33, with its two ends connected to the mounting member 31 and the flexible scraper 32, respectively. The elastic member 33 applies an elastic force to the flexible scraper 32 to keep it abutting against the outer peripheral surface of the magnetic drum. The function of the elastic member 33 is directly related to the low-resistance scraping conditions described above. Since the contact pressure required for scraping has been reduced due to magnetic field attenuation, the elastic member 33 does not need to provide excessive elastic force to maintain the abutment of the flexible scraper 32. A smaller elastic force means that the elastic member 33 itself has a lower stress level, resulting in a longer fatigue life, and the pressure fluctuation amplitude applied to the flexible scraper 32 is also correspondingly narrowed. When the magnetic drum experiences radial runout due to manufacturing tolerances or temperature changes, the elastic member 33 can complete the displacement compensation with a small pressure fluctuation, preventing the scraper from being pressed against the magnetic drum surface due to excessive instantaneous pressure, thus avoiding accelerated wear, and also preventing the scraper from detaching from contact due to insufficient pressure. The flexible scraper 32 can continuously and evenly abut against the outer peripheral surface of the magnetic drum during long-term operation, ensuring the integrity of the scraping action. There is no residue on the non-magnetic area surface after scraping, and the first magnetic drum 22 re-enters the object to be separated with a clean surface in each cycle.

[0032] In some embodiments, the receiving cavity 11 has an inlet 111 and an outlet 112 disposed opposite to each other along the second direction Y; the magnetic separation device 100 further includes a recovery assembly 50, which is disposed in the receiving cavity 11 and located on both sides of the first discharge member 40 along the first direction X. The recovery assembly 50 includes a recovery shaft 51 and a second magnetic drum 52. The recovery shaft 51 is rotatably connected to the housing 10, and the second magnetic drum 52 is connected to the recovery shaft 51. The second magnetic drum 52 and the outlet 112 are correspondingly disposed along the second direction Y. Thus, when the water treated by the first magnetic drum 22 flows to the outlet 112, it flows through the area where the recovery assembly 50 is located, and the second magnetic drum 52 performs secondary adsorption on the residual magnetic flocs in the water flow that have not been captured. The recovery assembly 50 is located on both sides of the first discharge member 40, utilizing the area outside the space occupied by the first discharge member 40, without increasing the volume of the receiving cavity 11, and at the same time, it concentrates the secondary recovered flocs for processing, reducing the total amount of magnetic flocs lost with the effluent.

[0033] In some embodiments, the magnetic separation device 100 further includes a second discharge member 60, which has a second discharge channel 61 and a second recovery port 62. The axis of the recovery shaft 51 is located on the plane where the second recovery port 62 is located. The second discharge member 60 includes a clearance wall section 63 and a flexible scraping wall section 64. The clearance wall section 63 connects to the flexible scraping wall section 64 and forms the second recovery port 62. The distance between the clearance wall section 63 and the axis of the recovery shaft 51 is greater than the radius of the second magnetic drum 52, and the distance between the scraping wall section and the axis of the recovery shaft 51 is less than or equal to the radius of the second magnetic drum 52. Thus, when the second magnetic drum 52 rotates, the adsorbed flocs first pass through the space where the clearance wall section 63 is located and smoothly enter the area where the second recovery port 62 is located, and then come into contact with the flexible scraping wall section 64 and are scraped off. The avoidance wall section 63 and the flexible scraping wall section 64 together form the second recovery port 62. The scraping and discharge actions are completed in one part, eliminating the need to set up a separate scraper assembly 30 and discharge component for the second magnetic drum 52.

[0034] Optionally, the surface of the second magnetic drum 52 may be provided with multiple arrayed magnetic adsorption protrusions to enhance the adsorption of fine magnetic flocs. A rotation sensor may be installed on the recovery shaft 51 to provide feedback on the rotation speed signal to control the drive motor and keep the rotation speed of the recovery shaft 51 stable.

[0035] In some embodiments, the magnetic separation device 100 includes a filter assembly 70, which is disposed on the side of the receiving cavity 11 near the inlet 111. The projection of the filter assembly 70 along the second direction Y covers the inlet 111. The filter assembly 70 is used to filter or agitate the material to be separated input from the inlet 111. Thus, before the material to be separated enters the receiving cavity 11, it passes through the filter assembly 70, where large particles of impurities are intercepted or the flow pattern is disturbed, reducing the amount of impurities entering the first magnetic drum 22. This allows for more sufficient contact between the outer peripheral surface of the first magnetic drum 22 and the material to be separated, reducing the likelihood of impurities entangled or embedded on the surface of the first magnetic drum 22, and ensuring the reliability of floc adsorption in the magnetic region 221.

[0036] In some embodiments, the filter assembly 70 includes a baffle 71 and a guide plate 72. The baffle 71 is disposed in the receiving cavity 11 and is correspondingly disposed to the liquid inlet 111. The guide plate 72 is located on the side of the baffle 71 away from the liquid inlet 111 and is used to guide the material to be separated toward the magnetic drum assembly 20. In this way, the baffle 71 first intercepts and buffers the material to be separated, and the guide plate 72 then guides the separated portion toward the magnetic drum assembly 20. After the material to be separated is de-energized by the baffle 71, its flow rate decreases, and it is then directionally transported by the guide plate 72. The concentration and flow rate of the material to be separated in contact with all parts of the surface of the first magnetic drum 22 tend to be uniform, and each region of the magnetic zone 221 can effectively adsorb the material.

[0037] Optionally, the filter assembly 70 may also include a filter screen structure, which is installed between the baffle 71 and the guide plate 72. The mesh size is customized according to the particle size of the impurities. The surface of the filter screen may have multiple conical protrusions, which generate micro-vortices when the fluid passes through, preventing impurities from depositing on the screen surface. A vibration device may be connected to one side of the filter screen, and the timed vibration causes the clogging particles to fall off. The filter assembly 70 may also include a magnetic filter layer made of magnetic material, which pre-adsorbs some magnetic flocs before the material to be separated enters the receiving cavity 11, reducing the load on the first magnetic drum 22. A pre-separation device may also be added to the front end of the liquid inlet 111, which uses the principle of gravity sedimentation or vortex separation to initially separate the particles with a larger specific gravity in the material to be separated.

[0038] In some embodiments, the magnetic region 221 is provided with a plurality of magnets of different polarities arranged in an alternating manner; the outer circumferential surface of the non-magnetic region 222 is provided with anti-magnetic covers on both sides of the non-magnetic region 222 along the circumferential direction of the rotating shaft 21. Thus, the magnets in the magnetic region 221 are arranged with alternating polarities, forming a continuously polarized magnetic field around the magnetic drum. The magnetic flocs are repeatedly subjected to changes in magnetic force direction during the movement of the magnetic drum, making them easier to capture and retain on the surface of the magnetic region. The anti-magnetic covers on both sides of the non-magnetic region 222 collect leakage magnetic flux from the magnets in the magnetic region 221 at the boundary of the non-magnetic region, further reducing the residual magnetic field on the surface of the non-magnetic region.

[0039] Optionally, the magnets in the magnetic section 221 can also be arranged in a spiral pattern along the Z-axis of the rotating shaft 21, with adjacent magnets exhibiting alternating polarities. This spiral arrangement ensures that each point along the Z-axis experiences alternating magnetic fields as the magnetic drum rotates, generating continuous magnetic disturbance and a pushing tendency along the Z-axis on the adsorbed flocs, facilitating the concentration of the flocs in the scraping area. The magnets in the magnetic section 221 can also be arranged in groups, with several magnets of the same polarity forming a group, and opposite polarities between groups. The abrupt change in magnetic field at the boundary between groups can shake off weakly adsorbed impurities. The magnets in the magnetic section 221 can also be constructed as a three-dimensional Heilbeck array, with the magnets arranged according to a predetermined pattern in the circumferential, Z-axis, and radial directions. This concentrates the magnetic field energy on one side of the working surface of the magnetic drum, significantly enhancing the surface magnetic field gradient and enabling the capture of finer magnetic particles. The permanent magnets in the magnetic section 221 can be partially or completely replaced with segmented electromagnets. The control unit can independently adjust the current of each segment of electromagnet according to the sensor signal to realize the dynamic distribution of the magnetic field strength. The control unit can also drive each segment of electromagnet in sequence to generate a traveling wave magnetic field that moves along the circumference, apply tangential thrust to the magnetic flocs, and actively transport them to the scraper area.

[0040] The second magnetic drum 52 may be provided with alternating secondary magnetic regions and secondary non-magnetic regions. The internal structure of the secondary magnetic regions is similar to the internal structure of the aforementioned magnetic region 221, and the internal structure of the secondary non-magnetic regions is similar to the internal structure of the aforementioned non-magnetic region 222. These will not be described in detail here.

[0041] In some embodiments, see Figure 2 The outer peripheral surfaces of the non-magnetic regions 222 of the first magnetic drum 22 and the second magnetic drum 52 are provided with multiple grooves 223. These grooves 223 extend along the axial direction Z of the rotating shaft 21 and are spaced apart from each other along the circumferential direction of the rotating shaft 21. The side surfaces of the grooves 223 are tangent to the outer peripheral surfaces of the magnetic drums. In this way, the grooves 223 increase the actual adsorption area of ​​the magnetic drum surface, and the tangential side surfaces avoid right-angled concave corners. Magnetic flocs are more easily slid out along the side surfaces of the grooves under the action of the scraper, and are not compacted at the bottom of the grooves.

[0042] Optionally, the groove 223 is a spiral-shaped guide channel that converges from both ends of the first magnetic drum 22 along the Z-axis towards the center, and the first recovery port 42 of the first discharge component 40 is correspondingly located at the center. When the first magnetic drum 22 rotates, the sidewall of the spiral-shaped guide channel generates a pumping effect on the flocs along the Z-axis to transport the scraped flocs to the scraper assembly 30. When the second magnetic drum 52 rotates, the sidewall of the spiral-shaped guide channel generates a pumping effect on the flocs along the Z-axis to transport the scraped flocs to the flexible scraping wall section 64.

[0043] The outer peripheral surfaces of the first magnetic drum 22 and the second magnetic drum 52 can be coated with a smooth nano-coating to reduce the adhesion between the adsorbent and the surface. The outer peripheral surfaces of the first magnetic drum 22 and the second magnetic drum 52 can be sandblasted to form uniform micro-protrusions, increasing the contact friction with the scraper.

[0044] In some embodiments, see Figure 3 The non-magnetic region 222 includes multiple first sub-regions 2221, multiple second sub-regions 2222, and multiple elastic regions 2223. The sub-regions are arranged side-by-side along the circumference of the first magnetic drum 22 and connected to the rotating shaft 21. The multiple second sub-regions 2222 are movably connected to their corresponding first sub-regions 2221 along the radial direction of the first magnetic drum 22. Each elastic region 2223 has its two ends connected to the corresponding first sub-region 2221 and second sub-region 2222, respectively. Thus, when the first magnetic drum 22 rotates, the second sub-regions 2222 tend to move outward under centrifugal force, and the elastic regions 2223 provide a restoring force. When the non-magnetic region 222 rotates to the vicinity of the scraper, if there are residual lint particles there, the radial micro-movement of the second sub-regions 2222 can help loosen them. The presence of the elastic regions 2223 limits the range of motion of the second sub-regions 2222, without affecting the overall connection between the non-magnetic region 222 and the magnetic region 221.

[0045] In some embodiments, each second sub-part 2222 has a groove 223 at one end opposite to the first sub-part 2221. Thus, when the second sub-part 2222 moves radially, the morphological change of the groove 223 makes it easier for a small amount of flocculent material that may be attached to the surface of the non-magnetic region 222 to lose its attachment point, further reducing the possibility of residue.

[0046] In some embodiments, see Figure 3 One of the first sub-parts 2221 and the second sub-part 2222 is provided with a guide groove 2224, and the other of the first sub-parts 2221 and the second sub-part 2222 is provided with a guide portion 2225. The guide portion 2225 is movably fitted into the guide groove 2224 along the radial direction of the rotating shaft 21. The elastic portion 2223 is received in the guide groove 2224. In this way, the movement path of the second sub-part 2222 is determined, and it will not interfere with the adjacent structure of the non-magnetic region 222 due to circumferential offset. The deformation of the elastic portion 2223 is also completed within the guide groove 2224, and the structure operates reliably.

[0047] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A magnetic separation device, characterized in that, include: A housing having a receiving cavity for receiving the object to be separated; A magnetic drum assembly is disposed in the receiving cavity. The magnetic drum assembly includes a rotating shaft and a first magnetic drum. The rotating shaft is rotatably connected to the housing. The first magnetic drum is connected to the rotating shaft. The first magnetic drum includes a magnetic region and a non-magnetic region. The magnetic region is constructed as an arc-shaped structure with an opening. The non-magnetic region is disposed at the opening and connected to both ends of the magnetic region. The magnetic region is provided with a plurality of magnets for adsorbing magnetic flocs in the body to be separated. A scraper assembly is provided radially along the shaft member on one side of the first magnetic drum along a first direction. The scraper assembly includes a mounting member and a flexible scraper. The mounting member is connected to the housing. The length direction of the flexible scraper is parallel to the axial direction of the shaft member. One end of the flexible scraper along its width direction is connected to the mounting member. The other end of the flexible scraper along its width direction abuts against the outer peripheral surface of the first magnetic drum and is used to scrape off the magnetic flocs adsorbed in the magnetic region. The first discharge component is disposed on one side of the first magnetic drum along a second direction, which intersects with the first direction. The first discharge component has a first discharge channel with a first recovery port, which is correspondingly disposed at the end of the flexible scraper away from the mounting component. The first discharge component is used to scrape the magnetic flocs off by the flexible scraper.

2. The magnetic separation device according to claim 1, characterized in that: The minimum distance between the outer peripheral surface of the non-magnetic region and the axis of the rotating shaft is D1, and the maximum distance between the outer peripheral surface of the magnetic region and the axis of the rotating shaft is D2, where D1 ≥ D2.

3. The magnetic separation device according to claim 1, characterized in that: The accommodating cavity has an inlet and an outlet that are arranged opposite to each other along the second direction; The magnetic separation device further includes a recovery assembly, which is disposed in the receiving cavity and located on both sides of the first discharge member along the first direction. The recovery assembly includes a recovery shaft and a second magnetic drum. The recovery shaft is rotatably connected to the housing, and the second magnetic drum is connected to the recovery shaft. The second magnetic drum and the liquid outlet are arranged correspondingly along the second direction.

4. The magnetic separation device according to claim 3, characterized in that: The magnetic separation device further includes a second discharge component, which has a second discharge channel and a second recovery port. The axis of the recovery shaft is located on the plane where the second recovery port is located. The second discharge component includes a clearance wall section and a flexible scraping wall section. The clearance wall section is connected to the flexible scraping wall section and forms the second recovery port. The distance between the clearance wall section and the axis of the recovery shaft is greater than the radius of the second magnetic drum, and the distance between the scraping wall section and the axis of the recovery shaft is less than or equal to the radius of the second magnetic drum.

5. The magnetic separation device according to claim 1, characterized in that: The receiving cavity has a liquid inlet; The magnetic separation device includes a filter assembly disposed on the side of the receiving cavity near the liquid inlet. The projection of the filter assembly along the second direction covers the liquid inlet. The filter assembly is used to filter or agitate the substance to be separated input from the liquid inlet.

6. The magnetic separation device according to claim 5, characterized in that: The filter assembly includes a baffle and a guide plate. The baffle is disposed in the receiving cavity and is correspondingly arranged with respect to the liquid inlet. The guide plate is located on the side of the baffle away from the liquid inlet and is used to guide the material to be separated toward the magnetic drum assembly.

7. The magnetic separation device according to claim 1, characterized in that: The magnetic region is provided with multiple magnets of different polarities arranged in an alternating manner; The outer peripheral surface of the non-magnetic region is provided with anti-magnetic covers on both sides of the non-magnetic region along the circumferential direction of the rotating shaft.

8. The magnetic separation device according to claim 1, characterized in that: The scraper assembly further includes an elastic member, the two ends of which are respectively connected to the mounting member and the flexible scraper. The elastic member is used to apply an elastic force to the flexible scraper so that the flexible scraper remains against the outer peripheral surface of the magnetic drum.

9. The magnetic separation device according to claim 1, characterized in that: The outer peripheral surface of the non-magnetic region is provided with a plurality of grooves, which extend along the axial direction of the rotating shaft and are spaced apart from each other along the circumferential direction of the rotating shaft. The side surface of the grooves is tangent to the outer peripheral surface of the magnetic drum.

10. The magnetic separation device according to claim 1, characterized in that: The non-magnetic region includes multiple first sub-parts, multiple second sub-parts, and multiple elastic parts. The multiple sub-parts are arranged side by side along the circumference of the first magnetic drum and connected to the rotating shaft. The multiple second sub-parts are movably connected to the corresponding first sub-parts along the radial direction of the first magnetic drum. The two ends of each elastic part are respectively connected to the corresponding first sub-part and second sub-part.

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