WO2024093073A1 - Magnetic-foreign-matter extraction device and method for extracting magnetic foreign matter - Google Patents

Abstract

Provided in the present application are a magnetic-foreign-matter extraction device and a method for extracting magnetic foreign matter. The magnetic-foreign-matter extraction device comprises a storage tank, a guide rail disc, a driving assembly and a magnetic attraction assembly, wherein the guide rail disc is arranged on the storage tank; a guide rail is formed on the guide rail disc; the driving assembly comprises a driver, a driving wheel, a driven wheel and a connector, the driving wheel and the driven wheel abut against the guide rail in a rolling manner, and a first end of the connector is rotationally connected to the driven wheel; an output end of the driver is connected to the driving wheel, and the driver is connected to a second end of the connector; and the magnetic attraction assembly comprises a sleeve and a magnetic attraction rod, the sleeve is located in the storage tank, the sleeve is detachably arranged on the driven wheel, an accommodating cavity is formed in the sleeve, and the accommodating cavity is configured for having the magnetic attraction rod placed therein.

Description

Magnetic foreign matter extraction device and magnetic foreign matter extraction method

This application claims priority to the Chinese patent application filed with the China Patent Office on November 5, 2022, with application number 202211380293.1, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of lithium battery material detection, for example, to a magnetic foreign matter extraction device and a magnetic foreign matter extraction method.

Background technique

Battery material production equipment involves many metal materials, which makes it easy for magnetic foreign matter, such as iron, to be produced during the production process. The presence of magnetic foreign matter makes it easy for the battery to have side reactions such as positive electrode oxidation and negative electrode reduction during the charge and discharge process, thereby reducing the safety and electrical performance of the battery. Magnetic foreign matter with a particle size greater than 5um is the main factor affecting the safety and electrical performance of the battery. Therefore, it is particularly important to effectively detect the particle size of magnetic foreign matter in battery materials.

In the related art, when detecting the particle size of magnetic foreign matter in battery materials, a slurry containing battery materials and a magnetic rod wrapped with a heat shrink tube are usually added to a drum machine, so that the magnetic rod and the slurry can rotate with the rotation of the drum machine, so that the magnetic rod can adsorb the magnetic foreign matter in the battery material, so that the magnetic foreign matter can be adsorbed on the surface of the heat shrink tube, and the magnetic rod after adsorbing the magnetic foreign matter is obtained. Then, the magnetic rod after adsorbing the magnetic foreign matter is taken out, and the magnetic foreign matter adsorbed on the surface of the heat shrink tube is cleaned to achieve the extraction of the magnetic foreign matter. Finally, the extracted magnetic foreign matter is subjected to a particle size detection to obtain the content and particle size distribution of the magnetic foreign matter, thereby obtaining the distribution of magnetic foreign matter with a particle size greater than 5um.

However, in actual applications, since the movement of the magnetic bar and slurry in the drum machine is random, the magnetic bar is prone to collide with the side wall of the drum machine, which can easily cause the heat shrink tube to be damaged, resulting in deviations in the extraction of magnetic foreign matter and affecting the accuracy of detection.

Summary of the invention

The present application provides a magnetic foreign matter extraction device and a magnetic foreign matter extraction method which can more comprehensively extract magnetic foreign matter from slurry, thereby improving the accuracy of magnetic foreign matter detection and reducing the probability of sleeve damage.

This application is implemented through the following technical solutions:

A magnetic foreign matter extraction device, comprising:

Storage tank;

A guide rail plate, the guide rail plate is arranged on the material storage tank, and the guide rail plate is formed with a guide rail;

A driving assembly, the driving assembly comprising a driver, a driving wheel, a driven wheel and a connecting member, the driving wheel and the driven wheel are in rolling contact with the guide rail, a first end of the connecting member is rotatably connected to the driven wheel; an output end of the driver is connected to the driving wheel, and the driver is connected to a second end of the connecting member;

A magnetic attraction component, the magnetic attraction component includes a sleeve and a magnetic attraction rod, the sleeve is located in the storage tank, the sleeve is detachably arranged on the driven wheel, and the sleeve forms a accommodating cavity, and the accommodating cavity is configured to place the magnetic attraction rod.

A method for extracting magnetic foreign matter, using the magnetic foreign matter extraction device described in any of the above embodiments to extract the magnetic foreign matter.

BRIEF DESCRIPTION OF THE DRAWINGS

The following is an introduction to the drawings required for use in the embodiments.

FIG1 is a schematic structural diagram of a magnetic foreign matter extraction device according to an embodiment of the present application;

FIG2 is a top view of the magnetic foreign matter extraction device shown in FIG1 from one direction;

FIG3 is a schematic structural diagram of a guide rail plate and a drive assembly according to an embodiment of the present application;

FIG4 is a schematic structural diagram of the guide rail plate and the driving assembly shown in FIG3 in one direction;

FIG5 is a schematic diagram of the connection structure between the magnetic rod and the sleeve according to an embodiment of the present application;

FIG. 6 is a flow chart of a method for extracting magnetic foreign matter according to an embodiment of the present application.

Reference numerals:

10. Magnetic foreign body extraction device; 100. Storage tank; 200. Guide plate; 210. Guide rail; 300. Driving assembly; 310. Driving wheel; 320. Driven wheel; 330. Connecting piece; 340. Driver; 500. Magnetic suction assembly; 510. Sleeve; 511. Accommodating chamber; 512. Spoiler slope; 5121. First spoiler slope; 5122. Second spoiler slope; 520. Magnetic suction rod; 600. Elastic clamp; 700. Bearing; 710. Outer ring; 720. Inner ring; 800. Diaphragm pump; 810. Discharge port; 900. Reflux pipe.

Detailed ways

The present application will be described below with reference to the accompanying drawings. The accompanying drawings provide optional implementations of the present application. However, the present application can be implemented in many different forms and is not limited to the implementations described herein.

It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there can be an intermediate element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms used in this article are The terms "vertical", "horizontal", "left", "right" and similar expressions are for illustrative purposes only and do not represent the only implementations.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to suppress this application. The term "and/or" used herein includes any and all combinations of one or more of the related listed items.

The present application provides a magnetic foreign matter extraction device, comprising a storage tank, a guide rail disc, a drive assembly and a magnetic attraction assembly, wherein the guide rail disc is arranged on the storage tank; the guide rail disc is formed with a guide rail; the drive assembly comprises a driver, a driving wheel, a driven wheel and a connecting piece, wherein the driving wheel and the driven wheel are in rolling abutment with the guide rail, and the first end of the connecting piece is rotationally connected to the driven wheel; the output end of the driver is connected to the driving wheel, and the driver is connected to the second end of the connecting piece; the magnetic attraction assembly comprises a sleeve and a magnetic attraction rod, wherein the sleeve is located in the storage tank, the sleeve is detachably arranged on the driven wheel, and the sleeve is formed with a accommodating cavity, and the accommodating cavity is configured to place the magnetic attraction rod.

The present application is described below with reference to specific embodiments:

As shown in FIGS. 1 to 3 , a magnetic foreign body extraction device 10 of an embodiment includes a storage tank 100, a guide plate 200, a drive assembly 300 and a magnetic suction assembly 500, wherein the guide plate 200 is arranged on the storage tank 100; the guide plate 200 is formed with a guide rail 210; the drive assembly 300 includes a driver 340, a driving wheel 310, a driven wheel 320 and a connecting member 330, wherein the driving wheel 310 and the driven wheel 320 are in rolling contact with the guide rail 210, and the connecting member 330 is The first end is rotatably connected to the driven wheel 320; the output end of the driver 340 is connected to the driving wheel 310, and the driver 340 is connected to the second end of the connector 330; the magnetic attraction assembly 500 includes a sleeve 510 and a magnetic attraction rod 520, the sleeve 510 is located in the storage tank 100, the sleeve 510 is detachably arranged on the driven wheel 320, and the sleeve 510 is formed with a accommodating cavity 511, and the accommodating cavity 511 is arranged to place the magnetic attraction rod 520.

In the above-mentioned magnetic foreign matter extraction device 10, the storage tank 100 can hold slurry, and the guide plate 200 is arranged on the storage tank 100 so that the guide plate 200 can be fixed on the storage tank 100 so that the driving component 300 can roll on the guide rail 210, and the sleeve 510 is formed with a accommodating cavity 511, so that the accommodating cavity 511 can place the magnetic suction rod 520.

The above-mentioned magnetic foreign matter extraction device 10, since the sleeve 510 is detachably arranged on the driven wheel 320, and the accommodating cavity 511 of the sleeve 510 can place the magnetic attraction rod 520, so that the magnetic attraction rod 520 and the sleeve 510 can be combined into a stirring member. In addition, since the driving wheel 310 and the driven wheel 320 are in rolling contact with the guide rail 210, the driving wheel 310 and the driven wheel 320 can be clamped on both sides of the guide rail 210. The first end of the connecting member 330 is rotatably connected to the driven wheel 320, and the driver 340 is connected to the second end of the connecting member 330, so that the driving wheel 310, the driven wheel 320 and the driver 340 can be connected as a whole. When the driver 340 is working, the driver 340 can drive the driving wheel 310 to rotate, so that the driving wheel 310 is rollingly connected to the guide rail 210. Since the driving wheel 310 can generate friction with the guide rail 210 when rotating, the driving wheel 310 can move on the guide rail 210. Since the driven wheel 320 is connected to the driving wheel 310 through the driver 340 and the connector 330, when the driving wheel 310 moves on the guide rail 210, the driving wheel can drive the driven wheel 320 to rotate through the driver 340 and the connector 330, and then drive the sleeve 510 on the driven wheel 320 to rotate, and then drive the magnetic rod 520 placed in the sleeve 510 to rotate. In this way, the rotating magnetic rod 520 and the sleeve 510 can play a good stirring role on the slurry, so that the magnetic rod 520 can fully and comprehensively absorb the magnetic foreign matter in the slurry. Since the driven wheel 320 can generate friction with the guide rail 210 when rotating, the driven wheel 320 can move on the guide rail 210, so that the magnetic rod 520 and the sleeve 510 can move in the storage tank 100, so that the magnetic rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry, that is, the magnetic rod 520 and the sleeve 510 can rotate and move forward in the slurry in an orderly manner. In this way, on the one hand, it is effectively avoided that the sleeve 510 is easily collided with the side wall of the storage tank 100 to cause the sleeve 510 to be easily damaged, thereby reducing the probability of sleeve 510 damage, thereby increasing the service life of the magnetic attraction component 500, and thereby reducing the cost of extracting magnetic foreign matter; on the other hand, it ensures that the magnetic rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry, thereby improving the accuracy of magnetic foreign matter detection.

The driver 340 is a motor or a rotary cylinder.

As shown in Figure 4, since the sleeve 510 is detachably arranged on the driven wheel 320, it is convenient for the user to quickly disassemble and assemble the sleeve 510. On the one hand, it is convenient for the user to replace the damaged sleeve 510 and the magnetic rod 520, thereby improving the maintenance efficiency. On the other hand, it is convenient for the user to quickly cut off the magnetic field of the magnetic rod 520 in the sleeve 510, so that the magnetic foreign matter adsorbed on the outer wall of the sleeve 510 can quickly enter the next cycle process, so as to quickly extract the magnetic foreign matter with less impurities, thereby improving the efficiency of extracting magnetic foreign matter.

As shown in Fig. 3 and Fig. 4, in some other embodiments, the driving assembly 300 further includes a bearing 700, and the driven wheel 320 is rotatably connected to the first end of the connecting member 330 via the bearing 700. By adding the bearing 700 to the first ends of the driven wheel 320 and the connecting member 330, the wear between the driven wheel 320 and the connecting member 330 can be effectively reduced, thereby increasing the service life of the driven wheel 320 and the connecting member 330.

As shown in FIG4 , in some other embodiments, the bearing 700 is rotatably disposed on the driven wheel 320, the inner ring 720 of the bearing 700 is fixedly connected to the first end of the connecting member 330, and the outer ring 710 of the bearing 700 is rotatably connected to the driven wheel 320, so as to realize the rotatable arrangement of the driven wheel 320 and the sleeve 510. In this embodiment, the inner ring 720 of the bearing 700 is welded and fixed to the first end of the connecting member 330, and the second end of the connecting member 330 is welded and fixed to the outer peripheral wall of the driver 340.

In some other embodiments, the bearing 700 is a ceramic ball bearing 700. Since the ceramic ball bearing 700 has good heat resistance and is not easily deformed by heat, it can ensure that the driven wheel 320 can rotate more smoothly and reliably, thereby ensuring that the magnetic rod 520 can rotate smoothly and reliably in the slurry. The outer wall of the sleeve 510 is ensured to have a relatively uniform magnetic field, so that the magnetic attraction rod 520 can more comprehensively adsorb the magnetic foreign matter on the sleeve 510 and is not likely to fall off, thereby improving the parallelism of the experimental detection.

In some other embodiments, the radial plane of the driving wheel 310 and the radial plane of the driven wheel 320 are perpendicular to the output direction of the driver 340. Since the radial plane of the driving wheel 310 and the radial plane of the driven wheel 320 are perpendicular to the output direction of the driver 340, the circumferential plane of the driving wheel 310 and the circumferential plane of the driven wheel 320 can respectively roll and abut against the two sides of the guide rail 210, thereby realizing the clamping arrangement of the driving wheel 310 and the driven wheel 320 and the guide rail 210.

In some other embodiments, the center point of the driving wheel 310 is aligned with the center point of the output end of the driver 340, and the center point of the driving wheel 310 is aligned with the center point of the driven wheel 320. In this way, the driver 340 can smoothly and reliably drive the driving wheel 310 to roll on the guide rail 210, thereby ensuring that the driven wheel 320 can smoothly and reliably roll on the guide rail 210.

As shown in Fig. 2, in some other embodiments, the guide rail 210 is S-shaped. By setting the guide rail 210 to be S-shaped, the guide rail 210 can be distributed more comprehensively on the guide rail plate 200, so that the magnetic rod 520 and the sleeve 510 can move more comprehensively in the storage tank, on the one hand, the magnetic rod 520 and the sleeve 510 can stir and mix the water and the slurry more evenly, and on the other hand, the magnetic rod 520 can more fully and quickly absorb the magnetic foreign matter in the slurry, which not only improves the extraction efficiency, but also improves the accuracy of detection.

In some other embodiments, the guide rail plate 200 is recessed inward to form a first rolling groove and a second rolling groove, the guide rail 210 is located at the connection between the first rolling groove and the second rolling groove, the driving wheel 310 is rollingly set in the first rolling groove, and the driven wheel 320 is rollingly set in the second rolling groove, so that the driving wheel 310 and the driven wheel 320 can reliably and smoothly roll in the first rolling groove and the second rolling groove, thereby effectively avoiding the shaking of the driving wheel 310 and the driven wheel 320, which may cause the magnetic foreign matter to fall off easily.

In some other embodiments, the driven wheel 320 is provided with a through hole, the second rolling groove is formed with an empty groove, and the empty groove and the through hole are connected to the storage tank 100, so that the sleeve 510 can pass through the through hole of the driven wheel 320 and enter the storage tank 100, so that the sleeve 510 can fully contact the slurry in the storage tank 100, and then the magnetic suction rod 520 can well absorb the magnetic foreign matter in the slurry.

In some other embodiments, a first inner groove is formed at the bottom of the first rolling groove, and the first inner groove is larger than the first rolling groove. Since the driving wheel 310 and the side wall of the first rolling groove are prone to generate debris after a long period of rotation, the generated debris is likely to block the first rolling groove and cause the driving wheel 310 to get stuck. Therefore, by setting the first inner groove larger than the first rolling groove, on the one hand, the first inner groove can fully receive the debris generated by the driving wheel 310, effectively avoiding the generated debris from clogging The driving wheel 310 is caused to get stuck in the first rolling groove, thereby ensuring that the driving wheel 310 can roll smoothly in the first rolling groove and facilitating the first inner groove to uniformly collect debris so that the user can quickly remove the debris; on the other hand, the space for the driving wheel 310 to move is increased to ensure that the driving wheel 310 can rotate and roll smoothly.

Similarly, in some other embodiments, a second inner groove is formed at the bottom of the second rolling groove, and the second inner groove is configured to receive debris generated when the driven wheel 320 rotates, and increase the space for the movement of the driven wheel 320, thereby effectively ensuring that the driven wheel 320 can rotate and roll smoothly in the second rolling groove.

In some other embodiments, the driven wheel 320 is a rubber wheel. Since an empty groove is formed in the second rolling groove, when the driven wheel 320 rolls in the second rolling groove, a small part of the driven wheel 320 is located in the empty groove, so that the debris generated by the driven wheel 320 when rotating will still fall into the storage tank, and since the traditional driven wheel 320 is usually a metal wheel, the metal debris that falls in will improve the result of magnetic foreign matter detection. Therefore, in order to ensure the accuracy of magnetic foreign matter detection, the present application sets the driven wheel 320 as a rubber wheel to ensure that the rubber debris that falls in will not affect the detection result of magnetic foreign matter. Optionally, the rubber wheel is a polytetrafluoroethylene rubber wheel. Since the friction coefficient of polytetrafluoroethylene is small, the wear between the polytetrafluoroethylene rubber wheel and the side wall of the second rolling groove is small, thereby reducing the amount of debris generated when the driven wheel 320 rotates, so as to reduce the probability of debris falling into the storage tank 100. In combination with the second inner groove, the second inner groove can effectively block debris from falling into the storage tank 100, further reducing the probability of debris falling into the storage tank 100, thereby ensuring the accuracy of detection.

In some other embodiments, the first side wall of the first rolling groove is provided with a plurality of first balls, the second side wall of the first rolling groove is provided with a plurality of second balls, the first side wall of the first rolling groove is arranged opposite to the second side wall of the first rolling groove, the plurality of first balls are rotatably arranged on the first side wall, and the plurality of second balls are rotatably arranged on the second side wall. In this way, by adding a plurality of first balls and a plurality of second balls, the driving wheel 310 is in arc contact with the side wall of the first rolling groove, thereby effectively reducing the friction between the driving wheel 310 and the side wall of the first rolling groove. On the one hand, it effectively reduces the amount of debris generated when the driving wheel 310 rotates, thereby increasing the service life of the driving wheel 310. On the other hand, it ensures that the driving wheel 310 can roll quickly with less force.

In some other embodiments, the third side wall of the second rolling groove is provided with a plurality of third balls, and the fourth side wall of the second rolling groove is provided with a plurality of fourth balls, the third side wall is arranged opposite to the fourth side wall, and the plurality of third balls are rotatably arranged on the third side wall, and the plurality of fourth balls are rotatably arranged on the fourth side wall. In this way, by adding a plurality of third balls and a plurality of fourth balls, the driven wheel 320 is in arc contact with the side wall of the second rolling groove, thereby effectively reducing the friction between the driven wheel 320 and the side wall of the second rolling groove. On the one hand, it effectively reduces the amount of debris generated when the driven wheel 320 rotates, thereby increasing the service life of the driving wheel 310, and on the other hand, it ensures that the driving wheel 310 can be achieved with less force. The moving wheel 310 rotates and rolls rapidly.

In some other embodiments, a plurality of first balls are arranged in one-to-one correspondence with a plurality of second balls, and the center points of the plurality of first balls are at the same height of the first side wall as the center points of the plurality of second balls are at the same height of the second side wall. In this way, it can be ensured that the driving wheel 310 can roll quickly, reliably and smoothly in the first rolling groove, thereby driving the driven wheel 320 to move quickly. In some other embodiments, a plurality of third balls are arranged in one-to-one correspondence with a plurality of fourth balls, and the center points of the plurality of third balls are at the same height of the third side wall as the center points of the plurality of fourth balls are at the same height of the fourth side wall, thereby ensuring that the driven wheel 320 can roll quickly and smoothly in the second rolling groove, effectively avoiding the phenomenon that the driving wheel 310 and the driven wheel 320 are prone to shaking during movement, thereby avoiding the phenomenon that magnetic foreign matter adsorbed on the outer wall of the sleeve 510 is prone to falling off.

Since the present application uses a driver 340 to control the movement of the driving wheel 310 and the driven wheel 320 on the guide plate 200, in conjunction with the use of a plurality of first balls, a plurality of second balls, a plurality of third balls, and a plurality of fourth balls, the driving wheel 310 and the driven wheel 320 can roll quickly and smoothly on the guide rail 210. In this way, while ensuring that the cost of extracting magnetic foreign matter is low, it is also ensured that the driven wheel 320 can roll at a uniform and fast speed in the second rolling groove, thereby increasing the speed of extracting magnetic foreign matter, and it is also ensured that the driven wheel 320 can reliably and smoothly rotate in the second rolling groove, thereby ensuring that the outer wall of the sleeve 510 has a relatively uniform and stable magnetic field, thereby enabling the magnetic attraction rod 520 to more comprehensively adsorb the magnetic foreign matter on the sleeve 510 and not easily fall off, thereby improving the parallelism of multiple groups of experimental detections.

In some other embodiments, the sleeve 510 is a plastic sleeve 510. Since the plastic sleeve 510 is a non-magnetic material, the magnetic rod 520 can form a magnetic field on the sleeve 510, so that the magnetic rod 520 can adsorb the magnetic foreign matter in the slurry on the outer wall of the sleeve 510 to achieve the extraction of the magnetic foreign matter. Optionally, the plastic sleeve 510 is a polyethylene terephthalate (PET) sleeve 510. Since the PET sleeve 510 has good mechanical properties and corrosion resistance, the PET sleeve 510 can maintain a good structural shape when rotating, thereby ensuring that the PET sleeve 510 can maintain a relatively uniform and stable magnetic field when mixing and stirring with the slurry, thereby improving the parallelism of multiple groups of experimental tests and also improving the service life of the sleeve 510.

In some other embodiments, the cross-section of the PET sleeve 510 is elliptical or circular. Since the cross-section of the magnetic rod 520 is circular, the magnetic rod 520 can be well inserted into the PET sleeve 510, so that the magnetic rod 520 can provide a more uniform magnetic field for the PET sleeve 510, thereby ensuring that the magnetic rod 520 can uniformly and comprehensively adsorb magnetic foreign matter, thereby ensuring that multiple groups of experimental tests have good parallelism, that is, good reproducibility. In an optional embodiment, the cross-section of the PET sleeve 510 is circular, so that the magnetic field of the PET sleeve 510 is more uniform, thereby making the parallelism of multiple groups of experimental tests better, and better ensuring the accuracy of the test results. That is, the magnetic field strength attenuation of the combination of the magnetic rod 520 and the PET sleeve 510 is lower, the uniformity is better, and it is conducive to the repeatability and reproducibility of the test.

In some other embodiments, the PET sleeve 510 is matched with the magnetic rod 520 so that the magnetic rod 520 can be well placed in the PET sleeve 510. The extension direction of the PET sleeve 510 is vertically arranged in the radial plane of the storage tank 100, so that the PET sleeve 510 can be vertically arranged in the radial plane of the storage tank 100, that is, the PET sleeve 510 can be located at the upper part, middle part and bottom part of the storage tank 100, so that when the PET sleeve 510 rotates, it can fully drive the slurry in the axial plane of the storage tank 100 to flow to the radial plane of the storage tank 100, and then the PET sleeve 510 can fully mix the slurry inside the storage tank 100 to the surroundings, thereby ensuring that the magnetic rod 520 in the PET sleeve 510 can more fully and comprehensively absorb the magnetic foreign matter in the slurry.

As shown in FIG5 , in some other embodiments, the PET sleeve 510 is formed with a plurality of spoiler slopes 512 in the circumferential direction. In this way, on the one hand, the distribution of the PET sleeve 510 in the radial plane of the storage tank 100 can be increased, thereby increasing the adsorption capacity of the magnetic foreign matter by the magnetic suction rod 520, and on the other hand, the plurality of spoiler slopes 512 can form a plurality of parabolic water curtains when the slurry inside the storage tank 100 flows around, so as to accelerate the mixing flow rate of the slurry in the storage tank 100 and the PET sleeve 510, so that the magnetic suction rod 520 can more quickly adsorb the magnetic foreign matter in the slurry, and on the other hand, the flow rate of the slurry in the radial plane of the storage tank 100 is increased, so that the PET sleeve 510 can be mixed with the slurry in the storage tank 100 more evenly, so that the magnetic suction rod 520 can more comprehensively adsorb the magnetic foreign matter in the slurry, thereby improving the accuracy of the detection of the magnetic foreign matter.

As shown in Figure 5, in some other embodiments, the multiple spoiler slopes 512 include multiple first spoiler slopes 5121 and multiple second spoiler slopes 5122, and the multiple first spoiler slopes 5121 and the multiple second spoiler slopes 5122 are staggered. In this way, while ensuring the acceleration of the mixing flow rate of the slurry in the storage tank 100 and the PET sleeve 510, it is also ensured that there is a relatively stable flow rate on both sides of the PET sleeve 510, that is, it is ensured that the PET sleeve 510 can rotate smoothly and reliably in the slurry, and then ensure that the magnetic suction rod 520 can evenly and comprehensively absorb magnetic foreign matter, thereby ensuring that multiple groups of experimental tests have good parallelism.

As shown in Figure 5, in some other embodiments, multiple first spoiler slopes 5121 and multiple second spoiler slopes 5122 are arranged in sequence in the extension direction of the PET sleeve 510, so that when the magnetic rod 520 and the PET sleeve 510 rotate, the multiple first spoiler slopes 5121 and the multiple second spoiler slopes 5122 can form multiple parabolic water curtains on the axial plane of the magnetic rod 520, thereby forming a multi-level fireworks-like mixing on the axial plane of the magnetic rod 520, thereby ensuring that the slurry and water can be mixed more quickly and evenly, so that the magnetic rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry.

As shown in FIG5 , in some other embodiments, the lengths of the plurality of first spoiler slopes 5121 increase sequentially from one end close to the bottom of the storage tank 100 to the end away from the bottom of the storage tank 100, so that when the magnetic rod 520 rotates, the plurality of first spoiler slopes 5121 can drive the slurry at the bottom of the storage tank 100 to flow to the middle and upper parts of the storage tank 100 in a larger range, so that the magnetic rod 520 can be more fully and comprehensively contacted and mixed with the slurry, and the magnetic rod 520 can better absorb the magnetic anisotropy in the slurry. That is to say, in each of the two adjacent first spoiler slopes 5121, the longer first spoiler slope 5121 can drive the slurry in the lower part to flow to the shorter first spoiler slope 5121 in a larger range, and the shorter first spoiler slope 5121 can block part of the water curtain lifted by the longer first spoiler slope 5121, so as to block part of the slurry back to the lower part for circulation mixing. The shorter first spoiler slope 5121 can also transfer and disperse the other part of the water curtain lifted by the longer first spoiler slope 5121 upward, so that the multiple first spoiler slopes 5121 can well mix the slurry at the bottom of the storage tank 100 to the middle and upper parts of the storage tank 100 to obtain a more uniform slurry, so that the slurry can be more fully and comprehensively contacted with the sleeve 510, thereby ensuring that the magnetic suction rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry.

Similarly, in some other embodiments, the lengths of the multiple second spoiler slopes 5122 increase successively from one end close to the bottom of the storage tank 100 to the end away from the bottom of the storage tank 100, so that the multiple second spoiler slopes 5122 can continuously mix the slurry at the bottom of the storage tank 100 to the middle and upper parts of the storage tank 100 to obtain a more uniform slurry, so that the slurry and the sleeve 510 can be in more full and comprehensive contact.

In some other embodiments, the spoiler slope 512 is a trapezoidal slope, a hemispherical slope, a pencil slope or a triangular slope, so that the slurry can form different water flows under the obstruction of the spoiler slope 512, so that the PET sleeve 510 can better and more comprehensively absorb the magnetic foreign matter in the slurry.

In some other embodiments, a plurality of protrusions are formed on the circumference of the magnetic rod 520, and each spoiler slope 512 is recessed inwardly toward one side of the magnetic rod 520 to form a positioning groove, each positioning groove is connected to the accommodating cavity 511, and each protrusion is snap-fitted into a positioning groove. In this way, by adding a plurality of protrusions on the circumference of the magnetic rod 520, on the one hand, the magnetic attraction force of the magnetic rod 520 is increased, so that the magnetic rod 520 can better and faster absorb magnetic foreign matter in the slurry, and on the other hand, the magnetic rod 520 can be better snapped into the PET sleeve 510, avoiding the PET sleeve 510 from rotating. The magnetic rod 520 is easily misaligned with the PET sleeve 510, causing the magnetic foreign matter adsorbed on the outer wall of the PET sleeve 510 to fall off. That is, the magnetic rod 520 is not easy to shake when the PET sleeve 510 rotates, so that the magnetic rod 520 and the PET sleeve 510 fit more closely, thereby ensuring that the magnetic rod 520 can provide a uniform and stable strong magnetic field for the PET sleeve 510, avoiding the magnetic foreign matter adsorbed on the outer wall of the PET sleeve 510 from falling off, thereby improving the parallelism of multiple groups of experimental tests, and thereby improving the accuracy of magnetic foreign matter detection.

In some other embodiments, the protrusion is hemispherical, so that the user can quickly disassemble and assemble the magnetic attraction rod 520. The hemispherical protrusion can better adapt to positioning grooves of different shapes, thereby improving the adaptability of the magnetic attraction rod 520 to positioning grooves of different shapes.

As shown in FIG. 4 , in some other embodiments, the driven wheel 320 is provided with two elastic clamping members 600 on one side facing the storage tank 100, and the two elastic clamping members 600 are configured to fix the sleeve 510. In some other embodiments, the two elastic clamping members 600 are connected to the outer ring 710 of the bearing 700, so that The two elastic clamping members 600 can better fix the sleeve 510 .

In some other embodiments, the magnetic foreign matter extraction device 10 further includes a diaphragm pump 800 and a reflux pipe 900, wherein the first end of the reflux pipe 900 is connected to the first end of the storage tank 100 through the diaphragm pump 800, and the second end of the reflux pipe 900 is connected to the second end of the storage tank 100. In this way, by adding the diaphragm pump 800, the slurry in the storage tank 100 can be continuously circulated and refluxed through the diaphragm pump 800, so that the magnetic suction rod 520 can better absorb the magnetic foreign matter in the slurry. In some other embodiments, the diaphragm pump 800 is a plastic diaphragm pump 800. Since the use of the plastic diaphragm pump 800 will not introduce new metal impurities, the accuracy of the detection results is ensured.

As shown in FIG. 1 , in some other embodiments, the diaphragm pump 800 is provided with a discharge port 810 , and the discharge port 810 is configured to quickly discharge the adsorbed slurry so as to enter the next cycle process more quickly, thereby greatly improving the efficiency of extracting magnetic foreign matter.

In some other embodiments, the magnetic foreign matter extraction device 10 also includes an automatic water adding component (not shown in the figure), which is configured to add water to the storage tank 100 to achieve automatic and rapid water addition, thereby avoiding the phenomenon of slow extraction efficiency of magnetic foreign matter in the slurry caused by manual water addition.

The present application also provides a method for extracting magnetic foreign matter, which is extracted by using the magnetic foreign matter extraction device described in any of the above embodiments. The magnetic foreign matter extraction device of the present application can not only extract the magnetic foreign matter in the slurry efficiently and quickly, but also has good parallelism of multiple groups of experiments, thereby improving the accuracy of detection, reducing the probability of sleeve damage, and increasing the service life of the magnetic foreign matter extraction device, thereby greatly reducing the cost of magnetic foreign matter extraction.

A method for extracting magnetic foreign matter in one embodiment includes: adding slurry and water to a storage tank for mixing and stirring, so that the magnetic foreign matter in the slurry is adsorbed on a sleeve by a magnetic rod; transferring and cleaning the magnetic foreign matter adsorbed on the sleeve to obtain the magnetic foreign matter; and detecting the particle size of the magnetic foreign matter.

Please refer to FIG. 6 . The present application is described below in conjunction with a specific embodiment. A magnetic foreign matter extraction method according to an embodiment includes some or all of the following steps:

S100, add slurry and water to the storage tank for mixing and stirring, so that the magnetic foreign matter in the slurry is adsorbed on the sleeve by the magnetic suction rod. By adding slurry and water to the storage tank and starting the driver, the driving wheel can drive the driven wheel to rotate under the drive of the driver, thereby driving the sleeve and the magnetic suction rod to rotate in the storage tank, so that the sleeve and the magnetic suction rod can play a good stirring role on the slurry and water, so that the slurry can be continuously rinsed and diluted, and the slurry and water can be mixed to form a uniform low-concentration slurry. The sleeve can provide an attachment point for magnetic foreign matter, so that the magnetic suction rod can more comprehensively adsorb the magnetic foreign matter in the slurry on the outer wall of the sleeve, thereby realizing the separation of the magnetic foreign matter.

S200, transferring and cleaning the magnetic foreign matter adsorbed on the sleeve to obtain the magnetic foreign matter. The sleeve, the magnetic foreign matter and the magnetic rod are taken out from the driven wheel, and then the sleeve, the magnetic foreign matter and the magnetic rod are placed in a beaker, and then the magnetic rod is taken out, and finally the magnetic foreign matter adsorbed on the sleeve is rinsed into the beaker with water, thereby obtaining the magnetic foreign matter.

S300, detecting the particle size of the magnetic foreign matter to obtain the distribution of magnetic foreign matter with different particle sizes.

In some other embodiments, the step of adding slurry and water to the storage tank for mixing and stirring includes the following steps: inserting a magnetic rod into the accommodating cavity of the sleeve, starting the driver, and adding water and slurry in sequence while keeping the sleeve rotating, to ensure that the sleeve and the magnetic rod can quickly disperse the slurry into the water, so that the slurry and water can be stirred to form a uniform low-concentration slurry, thereby ensuring that the magnetic rod can quickly and comprehensively absorb magnetic foreign matter in the slurry.

In some other embodiments, when the slurry and water are added to the storage tank for mixing, the rolling speed of the driving wheel is 0.1m/s~1m/s, and the rotation speed of the magnetic rod is 2rps~10rps. By controlling the rolling speed of the driving wheel to be 0.1m/s~1m/s and the rotation speed of the magnetic rod to be 2rps~10rps. In this way, it is ensured that the driving wheel can reliably and smoothly drive the driven wheel to move smoothly in the second rolling groove, so that the sleeve and the magnetic rod can rotate smoothly and at a uniform speed in the second rolling groove. On the one hand, it is ensured that the magnetic rod can provide a relatively uniform and stable magnetic field for the sleeve, thereby ensuring that the magnetic component has a relatively uniform magnetic field during each operation, thereby making multiple groups of magnetic foreign body detection experimental groups have better parallelism, that is, the volatility of multiple groups of experimental detection results is small, thereby improving the accuracy of detection, and on the other hand, effectively avoiding the shaking of the sleeve during rotation to cause the magnetic foreign body to fall, thereby improving the accuracy of the detection results.

It should be noted that if the slurry is added first, since the slurry has a certain viscosity, the added slurry can adhere to the surface of the sleeve to form a thin film, thereby affecting the adhesion of the magnetic foreign matter on the outer wall of the sleeve, that is, weakening the connectivity between the magnetic foreign matter that first adheres to the outer wall of the sleeve and the sleeve, making the magnetic foreign matter easy to fall off under high speed and long-term use. Therefore, the present application starts the driver first to put the magnetic rod in a stirring state, and then adds water, so that the added water can, on the one hand, moisten the rotating magnetic rod, thereby preventing the added slurry from forming a thin film on the surface of the magnetic rod; on the other hand, the water in the storage tank has a higher flow rate, so that the subsequently added slurry can be quickly dispersed in the water, so that the magnetic rod can be stirred and mixed with the slurry with a lower concentration, thereby ensuring that the magnetic rod can better adsorb the magnetic foreign matter in the slurry on the surface of the sleeve, that is, the sleeve and the magnetic foreign matter are directly magnetically connected, thereby ensuring that the magnetic foreign matter and the sleeve have a strong magnetic attraction, thereby effectively avoiding the phenomenon that the magnetic foreign matter is easy to fall off under high rotation speed and long-term use, thereby improving the accuracy of the detection result.

In one embodiment, a plurality of spoiler slopes are formed on the circumference of the PET sleeve. In this way, on the one hand, the distribution of the PET sleeve on the radial plane of the storage tank can be increased, thereby increasing the amount of magnetic foreign matter adsorbed by the magnetic attraction rod; on the other hand, the plurality of spoiler slopes can be formed when the slurry inside the storage tank flows to the surroundings. The water curtains are formed into multiple parabolic curves to speed up the mixing flow rate of the slurry and the PET sleeve in the storage tank, so that the magnetic suction rod can absorb the magnetic foreign matter in the slurry more quickly. On the other hand, the flow rate of the slurry in the radial plane of the storage tank is increased, so that the PET sleeve can be mixed with the slurry in the storage tank more evenly, so that the magnetic suction rod can more comprehensively absorb the magnetic foreign matter in the slurry, thereby improving the accuracy of the detection of magnetic foreign matter.

The plurality of spoiler slopes include a plurality of first spoiler slopes and a plurality of second spoiler slopes, and the plurality of first spoiler slopes and the plurality of second spoiler slopes are staggered. In this way, under the condition of accelerating the mixing flow rate of the slurry in the storage tank and the PET sleeve, a relatively stable flow speed is also ensured on both sides of the PET sleeve, that is, the PET sleeve can be rotated in the slurry stably and reliably, thereby ensuring that the magnetic suction rod can uniformly and comprehensively absorb the magnetic foreign matter, thereby ensuring that the multiple groups of experimental magnetic foreign matter detection have good parallelism.

In some other embodiments, multiple first spoiler slopes and multiple second spoiler slopes are arranged in sequence in the extension direction of the PET sleeve, so that when the magnetic rod and the PET sleeve rotate, the multiple first spoiler slopes and the multiple second spoiler slopes can form multiple parabolic water curtains on the axial plane of the magnetic rod, thereby forming a multi-level fireworks-like mixing on the axial plane of the magnetic rod, thereby ensuring that the slurry and water can be mixed more quickly and evenly, so that the magnetic rod can more fully and comprehensively absorb the magnetic foreign matter in the slurry.

In some other embodiments, the diameter of the accommodating cavity of the sleeve is 21mm-31mm, the thickness is 0.1mm-0.5mm, the diameter of the magnetic rod is 18mm-28mm, the magnetic field strength is 6000GS-9000GS, and the height of the protrusion of the magnetic rod is 0.5mm-3mm, so as to ensure that the magnetic rod can fit well with the sleeve, so as to ensure that the magnetic rod and the sleeve are not easily displaced when the magnetic rod rotates in the second rolling groove, and thus ensure that the magnetic rod can provide a uniform and stable magnetic field for the sleeve when rotating, so that the magnetic foreign matter adsorbed on the surface of the sleeve is not easy to fall off, thereby improving the accuracy of the detection result. Since the height of the protrusion is less than the distance between the sleeve and the magnetic rod, while ensuring that the magnetic rod can be smoothly placed in the sleeve, it also ensures that the magnetic rod can fit more closely with the sleeve, thereby avoiding the phenomenon that the magnetic rod is easily misaligned with the sleeve when rotating.

In some other embodiments, the water is ionized water filtered through a demagnetizer, thereby ensuring that the addition of ionized water will not introduce metal impurities, thereby ensuring the accuracy of the test results.

In some other embodiments, before the step of adding slurry and water to the storage tank for mixing and stirring so that the magnetic foreign matter in the slurry is adsorbed on the sleeve by the magnetic suction rod, and after the step of transferring and cleaning the magnetic foreign matter adsorbed on the sleeve to obtain the magnetic foreign matter, it also includes using a diaphragm pump and a reflux pipe to circulate the slurry and water so that the magnetic suction rod can more effectively adsorb the magnetic foreign matter in the slurry.

In one of the embodiments, when the diaphragm pump and the reflux pipe are used to circulate the slurry and water, the number of cycles is 2 to 3 times, and the circulation speed is 3 L/min to 5 L/min.

In an optional embodiment, the number of cycles is 3 times, the first cycle speed is 5 L/min, the time is 20 min to 30 min, the second cycle speed is 4 L/min, the time is 3 min, and the third cycle speed is 3 L/min, the time is 3 min. In this way, the magnetic suction rod can more effectively absorb magnetic foreign matter in the slurry.

It should be noted that since the concentration and viscosity of the slurry in the first cycle are higher than those in the second and third cycles, by reducing the circulation speed in the second and third cycles, the magnetic suction rod can have a higher and smoother rotation in the three cycles, thereby ensuring that the magnetic suction rod can evenly and stably absorb magnetic foreign matter.

It should also be noted that the traditional water addition is done manually, which is slow and affects the extraction efficiency of magnetic foreign matter. However, the present application greatly improves the efficiency of water addition by adding an automatic water adding component, so as to quickly enter the stirring and mixing. Moreover, the amount of water added in the present application is 5L each time, so that adding a large amount of water can quickly dilute the slurry to a lower concentration, so that the magnetic suction rod can better and faster absorb the magnetic foreign matter in the slurry, and then efficiently and quickly extract the magnetic foreign matter. The first circulation speed of the diaphragm pump is 5L/min, so that the slurry and water can maintain a high flow rate. On the one hand, the black impurities in the slurry can be washed away, and the black impurities are prevented from mixing in the magnetic foreign matter to affect the accuracy of the detection results. On the other hand, it ensures that the magnetic suction rod can rotate at a uniform speed in the slurry more quickly, stably and reliably, thereby ensuring that the magnetic suction rod can fully and comprehensively absorb the magnetic foreign matter in the slurry, thereby improving the parallelism of multiple groups of experiments, and thus ensuring the accuracy of the detection.

The total amount of water added in the traditional method is basically the same as the total amount of water added in the present application. The number of cycles in the present application is relatively less than that in the traditional method, that is, the number of cycles in the present application is 2 to 3 times, while the number of cycles in the traditional method is 5 to 8 times, thereby greatly improving the extraction time of magnetic foreign matter, reducing the traditional cycle time from 2 hours to 3 hours to 26 minutes to 36 minutes, achieving faster and more accurate extraction, and effectively reducing the damage of traditional heat shrink tubes to improve the accuracy of detection results.

It should also be noted that the heat shrink tube is prone to deformation when it collides with the drum machine, that is, the heat shrink tube cannot maintain a good structural state and is prone to skew, so that the magnetic suction rod cannot provide a relatively uniform and stable magnetic field for the heat shrink tube, which not only causes the breakage rate of the heat shrink tube to increase, thereby increasing the extraction cost, but also causes the parallelism of multiple groups of experimental tests to be poor, thereby affecting the accuracy of the final test results. The present application adopts a PET sleeve. Since the hardness of the PET sleeve is higher than that of the heat shrink tube, that is, the mechanical properties are better, and the use of a magnetic rod is combined, the PET sleeve can maintain a better structural shape when rotating in the slurry, so that the magnetic rod can provide a more uniform and stable magnetic field for the PET sleeve. On the one hand, it effectively ensures the magnetic connection between the magnetic foreign matter and the PET sleeve to avoid the magnetic foreign matter from falling off when the PET sleeve rotates, thereby ensuring that multiple groups of experimental tests have good parallelism and thus ensuring the accuracy of the test. On the other hand, it ensures that the magnetic rod can quickly and comprehensively absorb the magnetic foreign matter in the slurry, thereby improving the efficiency of extracting the magnetic foreign matter. On the other hand, it effectively avoids the collision of the PET sleeve with the inner wall of the storage tank when rotating, thereby avoiding the magnetic foreign matter adsorbed on the surface of the PET sleeve. The phenomenon that magnetic foreign matter is easy to fall off is eliminated, and the probability of the PET sleeve being easily damaged is reduced, thereby extending the service life of the PET sleeve and reducing the cost of extracting magnetic foreign matter.

In some other embodiments, the step of using a diaphragm pump and a reflux pipe to circulate the slurry and water includes the following steps: when the slurry and water complete the first cycle, the magnetic rod is extracted from the sleeve to separate the sleeve and the magnetic rod, so as to quickly cut off the magnetic field of the sleeve; water is added to the storage tank to flush the magnetic foreign matter attached to the outer surface of the sleeve into the water for the second cycle. The rapid water addition process is achieved by an automatic water adding component, which greatly saves the time for the first cycle to enter the second cycle, making the interval between the first cycle and the second cycle smaller, thereby shortening the time to extract magnetic foreign matter and improving the efficiency of extracting magnetic foreign matter. In order to improve the cleaning efficiency of magnetic foreign matter, the above-mentioned operation of entering the second cycle from the first cycle is repeated, that is, entering the third cycle, so as to improve the accuracy of detection.

Compared with the related art, this application has at least the following advantages:

1. The above-mentioned magnetic foreign body extraction device 10, since the sleeve 510 is detachably arranged on the driven wheel 320, and the accommodating cavity 511 of the sleeve 510 can place the magnetic attraction rod 520, so that the magnetic attraction rod 520 and the sleeve 510 can be combined into a stirring member, and since the driving wheel 310 and the driven wheel 320 are in rolling contact with the guide rail 210, the driving wheel 310 and the driven wheel 320 can be clamped and arranged on both sides of the guide rail 210, the first end of the connecting member 330 is rotatably connected to the driven wheel 320, and the driver 340 is connected to the second end of the connecting member 330, so that the driving wheel 310, the driven wheel 320 and the driver 340 can be connected as a whole. When the driver 340 is working, the driver 340 can drive the driving wheel 310 to rotate, so that the driving wheel 310 is rollingly connected to the guide rail 210. Since the driving wheel 310 can generate friction with the guide rail 210 when rotating, the driving wheel 310 can move on the guide rail 210. Since the driven wheel 320 is connected to the driving wheel 310 through the guide rail 210, the driving wheel 310 can drive the driven wheel 320 to rotate, and then drive the sleeve 510 on the driven wheel 320 to rotate, and then drive the magnetic rod 520 placed in the sleeve 510 to rotate. In this way, the rotating magnetic rod 520 and the sleeve 510 can play a good stirring role on the slurry, so that the magnetic rod 520 can fully and comprehensively absorb the magnetic foreign matter in the slurry. Since the driven wheel 320 can generate friction with the guide rail 210 when rotating, so that the driven wheel 320 can move on the guide rail 210, so that the magnetic rod 520 and the sleeve 510 can move in the storage tank 100, so that the magnetic rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry, that is, the magnetic rod 520 and the sleeve 510 can rotate and move forward in the slurry in an orderly manner. In this way, on the one hand, it is effectively prevented that the sleeve 510 and the side wall of the storage tank 100 collide with each other easily, which may cause the sleeve 510 to be easily damaged, thereby reducing the probability of damage to the sleeve 510, thereby increasing the service life of the magnetic suction component 500, and reducing the cost of magnetic foreign matter extraction; on the other hand, it ensures that the magnetic suction rod 520 can more fully and comprehensively absorb the magnetic foreign matter in the slurry, thereby improving the accuracy of magnetic foreign matter detection. 2. The above-mentioned magnetic foreign matter extraction device, since the sleeve 510 is detachably arranged on the driven wheel 320, it is convenient for the user to quickly disassemble and assemble the sleeve 510. On the one hand, it is convenient for the user to replace the damaged sleeve 510 and the magnetic suction rod 520, thereby improving the maintenance efficiency. On the other hand, it is convenient for the user to quickly cut off the magnetic field of the magnetic suction rod 520 in the sleeve 510, so that the magnetic foreign matter adsorbed on the outer wall of the sleeve 510 can be quickly removed. It can enter the next cycle process quickly, so as to quickly extract magnetic foreign matter with less impurities, thereby improving the efficiency of extracting magnetic foreign matter.

Some specific examples are given below, and if % is mentioned, it means percentage by weight. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Example 1

Place the magnetic rod into the PET sleeve on the S-shaped guide plate, control the rolling speed of the driving wheel to 0.2m/s and the rotation speed of the magnetic rod to 2rps to make the magnetic rod rotate.

Add 5L of deionized water filtered by a demagnetizer to the storage tank, start the plastic diaphragm pump, control the circulation flow rate of the plastic diaphragm pump to 5L/min, and then add 20KG of slurry to the storage tank so that the slurry can be stirred and dispersed into a uniform low-concentration slurry by the magnetic suction rod, and make the first circulation flow rate of the plastic diaphragm pump 5L/min, and the circulation time is 30min, which is equivalent to letting the material flow under the magnetic rod 30 times. Close the plastic diaphragm pump and open the discharge port to release all the adsorbed slurry; close the drive and the discharge port, pull out the magnetic suction rod, use the automatic water adding component to add 5L of water to the storage tank, open the plastic diaphragm pump to enter the second circulation, the second circulation flow rate is 4L/min, the circulation time is 3min, open the discharge port to release all the slurry in the second circulation, then close the drive and the discharge port, pull out the magnetic suction rod, use the automatic water adding component to add 5L of water to the storage tank, open the plastic diaphragm pump to enter the third circulation, the third circulation flow rate is 3L/min, and the circulation time is 3min.

Turn off the plastic diaphragm pump, remove the PET sleeve and the magnetic rod from the S-shaped guide plate at the same time and place them in a beaker, then pull out the magnetic rod, and then clean the PET sleeve with water, rinse the magnetic foreign matter adsorbed by the magnetic rod on the PET sleeve into the beaker, place a magnet with a magnetic strength of 6000 at the bottom of the beaker, use deionized water and anhydrous ethanol to rinse repeatedly, and continuously separate the mixture of impurities and magnetic foreign matter until the deionized water is clear, and the extraction of magnetic foreign matter is completed.

The particle size of the magnetic foreign matter is detected to obtain the distribution of magnetic foreign matter of different particle sizes.

Comparative Example 1

The difference from Example 1 is that a traditional heat shrink tube-coated magnetic rod is used to absorb magnetic foreign matter in the slurry. Exemplarily, 20 kg of slurry and 5 liters of water are placed in a sealed barrel, and then the sealed barrel is placed on a drum machine, and the barrel is rotated at 240 r/min for 30 minutes to complete the first cycle. Then the sealed barrel is opened, the heat shrink tube-coated magnetic rod is pulled out, the liquid is poured out, and 5 liters of water and the heat shrink tube-coated magnetic rod are added to the sealed barrel for a second cycle. The barrel is rotated at 240 r/min for 30 minutes to complete the second cycle. This is repeated 5 times to complete the extraction of magnetic foreign matter, and the extracted magnetic foreign matter is transferred and cleaned to obtain magnetic foreign matter with less impurities, and finally the particle size of the magnetic foreign matter is detected.

Test Item 1: 10 parallel samples were tested using Example 1 and Comparative Example 1 respectively. The test results shown in Table 1 are obtained as follows:

Table 1

Test Item 2: The phenomenon of heat shrink tube or sleeve damage when the parallel samples of Example 1 and Comparative Example 1 were tested 10 times was counted, and the statistical results were obtained as shown in Table 2 below:

Test Item 3: The magnetic field strength of the combination of the magnetic rods in Example 1 and Comparative Example 1 was tested three times, wherein the magnetic rods were all 6000GS, the diameter of the heat shrink tubes was 23 mm, and the diameter of the PET sleeves was 23 mm, to form three groups of magnetic components in Example 1 and Comparative Example 1, and the surface magnetic field strength of the three groups of magnetic components was tested respectively. The testing standard was to select the maximum and minimum points of the gap between the heat shrink tube and the magnetic rod in each group of magnetic components in Example 1 for testing, and to select the maximum and minimum points of the gap between the PET sleeve and the magnetic rod in each group of magnetic components in Comparative Example 1 for testing, and the following Table 3 was obtained:

table 3

It can be seen from Table 1 that the parallelism of multiple groups of experiments in Example 1 is obviously better than that of multiple groups of experiments in Comparative Example 1. This is mainly because the movement of the magnetic rod and the slurry in Example 1 is orderly self-rotation, and the magnetic rod placed in the PET sleeve can form a relatively uniform and stable magnetic field strength on the surface of the PET sleeve, thereby ensuring that the magnetic rod in each experiment can maintain a relatively consistent uniform and stable magnetic field. The parallelism of multiple experiments was improved.

As can be seen from Table 2, the heat shrink tube rupture phenomenon occurred three times in the 10 parallel tests of Comparative Example 1, while the sleeve rupture phenomenon did not occur in the 10 parallel tests of Example 1. On the one hand, the sleeve in which the magnetic suction rod is placed in Example 1 is a PET sleeve, and its mechanical strength is better than that of the heat shrink tube of Comparative Example 1. On the other hand, the movement mode of the magnetic suction rod of Example 1 is different from that of the magnetic suction rod of Comparative Example 1, that is, the magnetic suction rod of Example 1 rotates forward in an orderly manner, while the magnetic suction rod of Comparative Example 1 contacts and collides with the drum machine, so that Example 1 can effectively reduce the probability of PET sleeve rupture, thereby reducing the cost of extracting magnetic foreign matter.

As shown in Table 3, the magnetic field strength generated by the magnetic suction rod of Example 1 placed in the PET sleeve is significantly higher and more uniform than the magnetic field strength of the conventional heat shrink tube-wrapped magnetic suction rod method in Comparative Example 1, so that the combination method of using the magnetic suction rod placed in the PET sleeve in Example 1 can better ensure that the PET sleeve has a more uniform and stable magnetic field, so as to ensure that the magnetic suction rod can better and more comprehensively adsorb the magnetic foreign matter in the slurry, which not only improves the extraction efficiency, but also improves the parallelism of multiple groups of experiments, thereby improving the accuracy of detection. As can be seen from Table 3, the loss rate of the magnetic force in the combination method of placing the magnetic suction rod in the PET sleeve is low, thereby improving the utilization rate of the magnetic force of the magnetic suction rod and effectively avoiding more waste of the magnetic suction rod. Therefore, the magnetic field strength attenuation of the combination method of the magnetic suction rod and the PET sleeve in Example 1 is lower, and the uniformity is better, which is conducive to the repeatability and reproducibility of the test.

Claims (10)

1. A magnetic foreign matter extraction device, comprising:

   Storage tank;

   A guide rail plate, the guide rail plate is arranged on the material storage tank, and the guide rail plate is formed with a guide rail;

   A driving assembly, the driving assembly comprising a driver, a driving wheel, a driven wheel and a connecting member, the driving wheel and the driven wheel are in rolling contact with the guide rail, a first end of the connecting member is rotatably connected to the driven wheel; an output end of the driver is connected to the driving wheel, and the driver is connected to a second end of the connecting member;

   A magnetic attraction component, the magnetic attraction component includes a sleeve and a magnetic attraction rod, the sleeve is located in the storage tank, the sleeve is detachably arranged on the driven wheel, and the sleeve forms a accommodating cavity, and the accommodating cavity is configured to place the magnetic attraction rod.
2. According to the magnetic foreign matter extraction device according to claim 1, the driving assembly further comprises a bearing, and the driven wheel is rotatably connected to the first end of the connecting member via the bearing.
3. The magnetic foreign matter extraction device according to claim 1, wherein the guide rail is S-shaped.
4. The magnetic foreign matter extraction device according to claim 1, wherein the sleeve is a plastic sleeve.
5. The magnetic foreign matter extraction device according to claim 1 further includes a diaphragm pump and a reflux pipe, wherein the first end of the reflux pipe is connected to the first end of the storage tank through the diaphragm pump, and the second end of the reflux pipe is connected to the second end of the storage tank.
6. The magnetic foreign matter extraction device according to claim 5, wherein the diaphragm pump is provided with a discharge port.
7. The magnetic foreign matter extraction device according to claim 1 further comprises an automatic water adding component, wherein the automatic water adding component is configured to add water to the storage tank.
8. A method for extracting magnetic foreign matter, using the magnetic foreign matter extraction device described in any one of claims 1 to 7 to extract the magnetic foreign matter.
9. The method for extracting magnetic foreign matter according to claim 8, wherein the method for extracting magnetic foreign matter comprises:

   Add slurry and water into the storage tank and mix and stir them so that the magnetic foreign matter in the slurry is adsorbed on the sleeve by the magnetic attraction rod;

   Transferring and cleaning the magnetic foreign matter adsorbed on the sleeve to obtain the magnetic foreign matter;

   The particle size of the magnetic foreign matter is detected.
10. According to the method for extracting magnetic foreign matter according to claim 9, when the slurry and water are added to the storage tank for mixing, the rolling speed of the driving wheel is 0.1m/s to 1m/s, and the rotation speed of the magnetic suction rod is 2rps to 10rps.