Piston dry type impurity removal device for superconducting magnetic separator

Abstract

The utility model relates to a piston dry-type impurity removal device for a superconducting magnetic separator. The piston dry-type impurity removal device comprises a piston-magnetism gathering medium structure assembly and a precision tube assembly, wherein the piston-magnetism gathering medium structure assembly capable of reciprocating along the axis direction is arranged in the precision tube assembly; three groups of inlets and outlets are formed in the precision tube; the piston-magnetism gathering medium structure assembly is provided with two separation areas in the axial direction, and the two separation areas are connected together. A separation area center shaft is arranged in the separation area, piston flanges are arranged at the two ends of the separation area center shaft, and the space between the two piston flanges is filled with a magnetism gathering medium; and the outer wall of the piston flange is in sliding fit with the inner wall of the precision tube. According to the piston dry type impurity removal device for the superconducting magnetic separator, dry type impurity removal is carried out on high-purity powder, the impurity removal process of the high-purity powder is shortened, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the magnetic separation mineral processing machinery technical field, especially is used to the edulcoration device in the dry type superconducting magnetic separator of high purity powder, is applied to high purity powder edulcoration technical field. BACKGROUND

[0002] High purity powder, such as high purity quartz sand micro powder and Al2O3 micro powder, particle diameter is generally between 1 μm~10 μm, is the basic material of manufacturing high-speed digital circuit substrate, and high-speed digital circuit substrate is the hardware foundation of data center server, high-performance computing system and high-speed communication equipment. Since high-speed digital circuit is very sensitive to conductive and magnetic material in substrate, so it puts forward very strict requirements to metal impurity content in high purity powder, and expects to be infinitely close to zero content.

[0003] The analysis result of high purity powder production process shows that metal impurities will be produced in crushing, rounding and conveying process. Due to high hardness of powder itself, trace metal chips will be scraped from metal container and pipeline wall in above process. These metal chips are usually stainless steel material, and magneticity is very weak. Therefore, the characteristics of metal chips in high purity powder are: size is very small (1 μm~10 μm), magneticity is very weak, and quantity is very small, which brings great challenge to edulcoration process.

[0004] In early production practice, slurry type high gradient magnetic separator based on normal conductive wire is used in above edulcoration process. But since background magnetic field can only reach 1 Tesla~1.4 Tesla, powder in magnetic field has very limited edulcoration effect once, so multiple cycles and end detection method are generally used to ensure that the quantity of metal chips is reduced to below the allowable value. But this method is low in production efficiency on the one hand, and on the other hand, since metal chips are still produced in the process of circulating conveying, so even if the number of cycles is infinitely increased, the quantity of metal chips cannot be reduced to zero.

[0005] The applicant Jiangsu Jingkai Zhongke Superconducting High-tech Co., Ltd. applied a slurry type high gradient magnetic separator based on superconducting wire to the above-mentioned impurity removal process in 2022. The background magnetic field of the superconducting magnet reaches 5 Tesla. The number of metal micro-particles in the powder can be reduced to zero after passing through the magnetic field once. The separation tank can refer to the slurry high gradient magnetic separator separation tank and the flow distribution plate used in the separation tank disclosed in Chinese Patent No. CN117696237A. Since the lifting and lowering time of the superconducting magnet is much longer than that of the normal conductor magnet, in order to realize the strong magnetic adsorption and weak magnetic regeneration of the high gradient magnetic medium, the magnetic separator in the impurity removal technology refers to the magnetic separation system (Magnetic separation systems) disclosed in US Patent No. US5868257A (application No. US08535021, or WIPO publication No. WO9426417A1, priority of UK Patent Application No. GB9309426, 19930507). The reciprocating tank technology is adopted, that is, the magnetic medium is moved to the weak magnetic area to remove impurities after the adsorption period in the strong magnetic area is completed, and the regeneration of the adsorption function is completed, and the cycle is repeated. In order to realize the reciprocating motion of the magnetic medium, a certain length of dummy area is contained in the reciprocating tank for magnetic balance; and in order to connect the feed inlet and discharge outlet of the reciprocating tank to the feed bin and discharge bin, a rubber hose must be used. The magnetic separator has been applied to the wet magnetic force impurity removal process of high-purity powder.

[0006] The wet impurity removal process of high-purity powder must use high-purity fluid medium, such as high-purity water. Before entering the impurity removal process, the high-purity powder must be mixed with the fluid medium. After the impurity removal process is completed, drying must be performed to remove the fluid medium. This brings problems such as high impurity removal cost, long process, and low production efficiency.

[0007] Compared with the wet impurity removal process, the dry impurity removal process uses dry air as the fluid medium, does not need the mixing and drying processes, and has the advantages of short process and high production efficiency. However, in order to reduce pressure loss, avoid powder settlement, and reduce the probability of secondary pollution, the pneumatic conveying method requires a short conveying distance. In the reciprocating impurity removal magnetic separator, the dummy area for magnetic balance and the hose for connection are indispensable. Therefore, the superconducting magnetic separator adopting the reciprocating tank technology cannot meet the requirements of short-distance pneumatic conveying.

[0008] If it is desired to realize dry impurity removal under the superconducting magnet, the structure of the impurity removal device of the magnetic separator needs to be improved. SUMMARY

[0009] The utility model aims at providing a kind of piston dry impurity removal device for superconducting magnetic separator, to realize dry impurity removal, shorten the impurity removal process of high-purity powder, improve production efficiency.

[0010] The utility model discloses a piston dry type impurity removal device for superconducting magnetic separator, which comprises a piston-magnetic medium structure assembly and a precision tube assembly.

[0011] The piston-magnetic medium structure assembly is installed in the precision tube assembly and can reciprocate along the axial direction.

[0012] The precision tube assembly comprises a precision tube and end cap assemblies fixed at both ends of the precision tube.

[0013] The precision tube is a long straight cylindrical tube with smooth inner wall.

[0014] The end cap assemblies at both ends or the precision tube wall close to the end cap assemblies are provided with driving in-out ports.

[0015] The precision tube is provided with three groups of in-out ports, and each group of in-out ports comprises one inlet port and one outlet port.

[0016] The precision tube is divided into a magnetic separation zone and two impurity removal zones, and each zone is provided with one group of in-out ports.

[0017] The inlet port of the magnetic separation zone is a feeding port, and the outlet port is a discharging port.

[0018] The two impurity removal zones are a first impurity removal zone and a second impurity removal zone, and the corresponding inlet ports are a first impurity removal inlet port and a second impurity removal inlet port, and the corresponding outlet ports are a first impurity removal outlet port and a second impurity removal outlet port.

[0019] The piston-magnetic medium structure assembly is provided with two separation zones along the axial direction, and the two separation zones are connected together.

[0020] The separation zone is provided with a separation zone central shaft, and both ends of the separation zone central shaft are provided with piston flanges.

[0021] The outer wall of the piston flange and the inner wall of the precision tube form a sliding fit.

[0022] The length of the separation zone matches the length of the magnetic separation zone or the impurity removal zone, and when the separation zone overlaps with the magnetic separation zone or the impurity removal zone, one group of in-out ports is located between the two piston flanges of the separation zone.

[0023] As a further improvement of the utility model, the end cap assemblies of the precision tube assembly are detachably installed at both ends of the precision tube.

[0024] As a further improvement of the utility model, the in-out ports on the precision tube are arranged along the direction of the parallel cylinder body outer circle tangent.

[0025] Further, each in-out port on the precision tube is connected with external equipment through an in-out port assembly.

[0026] The import and export assembly comprises a fixed half ring, a pipe-equipped half ring, and a sealing ring;

[0027] The sealing ring is sleeved outside the precision pipe, and the sealing ring is provided with an opening which is aligned with the import and export on the precision pipe;

[0028] The fixed half ring and the pipe-equipped half ring are paired and sleeved outside the sealing ring and are connected and fixed by bolts;

[0029] The pipe-equipped half ring is provided with a connecting pipe which is in communication with the opening on the sealing ring and the import and export on the precision pipe;

[0030] The connecting pipe is aligned with the import and export, and the axis of the connecting pipe is parallel to the tangent of the outer circle of the barrel of the precision pipe.

[0031] As a further improvement of the utility model, a dummy area is arranged between the two separated areas of the piston-magnetic medium structure assembly;

[0032] A dummy area center shaft is arranged in the dummy area, and the dummy area center shaft is connected with the piston flange of the separated area or the separated area center shaft.

[0033] Further, a magnetic balance ring is arranged in the dummy area, and the magnetic balance ring is arranged outside the dummy area center shaft.

[0034] Further, the dummy area center shaft and the two piston flanges close to the dummy area are fixed together;

[0035] The separated area center shaft is detachably fixed on the piston flange close to the dummy area or the dummy area center shaft;

[0036] The piston flange on the outer side of the separated area is detachably fixed on the separated area center shaft;

[0037] The magnetic medium is detachably arranged in the separated area.

[0038] As a further improvement of the utility model, a piston sealing ring is arranged between the outer wall of the piston flange of the separated area and the inner wall of the precision pipe;

[0039] The piston sealing ring and the inner wall of the precision pipe form a dynamic sealing interface.

[0040] As a further improvement of the utility model, the import and export arranged on the wall of the precision pipe axially overlap the piston flange of the piston-magnetic medium structure assembly;

[0041] The axial length of the import and export is smaller than the thickness of the piston flange.

[0042] The utility model provides a kind of concrete structure of piston dry-type impurity removal device for superconducting magnetic separator, is composed of piston-magnetic medium structure component, precision tube component;Piston-magnetic medium structure component is composed of dummy element area center shaft, separation zone center shaft, piston flange, sealing ring, magnetic medium and magnetic balance ring;Precision tube component is composed of precision tube with 6 inlets and outlets, end cover, inlet and outlet half ring with tangential pipe and other components;Piston-magnetic medium structure component is installed in precision tube component, piston reciprocating motion is carried out along precision tube axial direction, so that the magnetic medium of two separation zones switches in magnetic separation zone and impurity removal zone, superstrong magnetic adsorption impurity removal is carried out in magnetic separation zone, and impurity removal is carried out in impurity removal zone, and efficient dry-type magnetic separation impurity removal operation is realized.

[0043] The piston dry-type superconducting magnetic separator of the utility model is combined with superconducting magnet to form piston dry-type superconducting magnetic separator, and the following features are specific:

[0044] 1, still adopt reciprocating motion technology, superconducting magnet keeps fixed position, and magnetic separator keeps magnetic field constant when working;But in the utility model, only magnetic medium reciprocates between strong magnetic zone and weak magnetic zone, and the position of outer wall of tank body keeps fixed.

[0045] 2, adopt double magnetic medium configuration.When one of magnetic medium adsorbs metal impurities in strong magnetic zone, the other magnetic medium blows the adsorbed metal impurities in weak magnetic zone.Therefore, double magnetic medium configuration has two working positions in one impurity removal period.Magnetic medium refers to wire or rod made of soft magnetic material, which is staggered and stacked with certain spacing between each other, and fills the entire cavity.

[0046] 3, two magnetic media are respectively constrained between two pairs of piston flanges.Sealing ring is sleeved on piston flange, and the number is generally two, and oil-free and self-lubricating dynamic sealing interface is formed between sealing ring and smooth tank body inner wall.A cavity is formed between two piston flanges and tank body inner wall, that is, separation cavity.

[0047] 4, two flanges close to each other in two pairs of piston flanges are welded with center shaft to form a whole with tank body inner wall, and center shaft is sleeved with certain thickness metal, which is same in material with magnetic medium, as magnetic balance component, and its thickness matches the filling rate of magnetic medium material in separation cavity, and the component uses half structure, and is fixed on center shaft by bolt fastening or clamp.

[0048] 5, two flanges away from each other in two pairs of piston flanges are respectively fixed on piston flange in dummy element area through respective center shaft, and they are detachably connected by screw fastening;All piston flanges and center shaft are coaxial with tank body.

[0049] 6. The body cylinder is a precision tube, the inner wall is smooth, through the superconducting magnet cylinder hole and with the inner hole wall surface only small gap, perpendicular to the axis of symmetry section with superconducting magnet symmetry section coincide. In the position beyond the superconducting magnet end face and close to the end face, along the parallel cylinder outer circle tangent direction punch, the position of the hole is contained in the two piston flange inside. When the hole outside one of the superconducting magnet end face as the feed port, the hole outside the other end face as the discharge port; in order to be able to clean discharge, the hole and piston flange along the axial coincidence 1~2mm. The diameter of the hole is less than the thickness of the piston flange.

[0050] 7. In the two weak magnetic area of the separation chamber working position, in the same way (along the parallel cylinder outer circle tangent direction) and the same position relationship between the piston flange (hole and piston flange along the axial coincidence 1~2mm), when the hole of one end is used as the air inlet, the hole of the other end is used as the air outlet and the exhaust port.

[0051] 8. Four piston flanges, three center shafts and two magnetic medium complete the assembly, forming a complete piston-magnetic medium structure, which can be moved as a whole inside the body cylinder.

[0052] 9. The two ends of the precision tube body cylinder are sealed by end cover, using detachable sealing method with sealing ring. The end cover is punched, and the center boss on the side of the piston flange is used to limit the stroke of the piston-magnetic medium assembly and form the air chamber. When the working area of the separation chamber needs to be changed, the hole on one of the end covers is used as the air inlet, and the hole on the other end cover is used as the air outlet. The valve on the external pipeline connected with the six inlets and outlets on the body cylinder is closed during the movement of the piston-magnetic medium assembly.

[0053] 10. The inlet / outlet of the cylinder is provided with a sealing ring, the sealing ring has a tangential hole coaxial with the inlet / outlet and the same diameter, the sealing ring is provided with a half ring with tangential pipe and a half ring without tangential pipe, and the two half rings are connected and fixed by bolt fasteners. The tangential pipe on the half ring is coaxial with the inlet / outlet of the cylinder and has the same diameter as the inlet / outlet. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 The overall appearance structure diagram of the piston dry superconducting magnetic separator;

[0055] Figure 2 The overall appearance front view of the piston dry superconducting magnetic separator;

[0056] Figure 3 The internal structure front view of the piston dry superconducting magnetic separator;

[0057] Figure 4 The internal structure main view of the piston dry-type superconducting magnetic separator in working state one;

[0058] Figure 5 The internal structure main view of the piston dry-type superconducting magnetic separator in working state two;

[0059] Figure 6 The structure schematic view of the precision pipe assembly of the utility model;

[0060] Figure 7 The overall structure schematic view of the end cover assembly of the precision pipe assembly of the utility model;

[0061] Figure 8 The front view of the end cover assembly of the precision pipe assembly of the utility model;

[0062] Figure 9 The local enlarged schematic view of the end cover part of the precision pipe assembly of the utility model;

[0063] Figure 10 The assembly schematic view of the inlet and outlet of the precision pipe assembly of the utility model;

[0064] Figure 11 The overall structure schematic view of the sealing ring of the inlet and outlet of the precision pipe assembly of the utility model;

[0065] Figure 12 The sealing structure sectional view of the inlet and outlet of the precision pipe assembly of the utility model;

[0066] Figure 13 The internal structure main view of the piston-magnetic medium structure assembly of the utility model;

[0067] Figure 14 The local enlarged Figure 13 view of the piston-magnetic medium structure assembly of the utility model; Figure 1

[0068] The local enlarged Figure 15 view of the piston-magnetic medium structure assembly of the utility model. Figure 13 Figure 2

[0069] Fig. 1 is the internal structure main view of the piston-magnetic medium structure assembly of the utility model; Fig. 2 is the overall structure schematic view of the precision pipe assembly of the utility model; Fig. 3 is the front view of the superconducting magnet of the utility model. DETAILED DESCRIPTION

[0070] The specific embodiments of the utility model are further described in detail below in combination with the drawings.

[0071] The utility model provides a kind of piston dry-type impurity removal device for superconducting magnetic separator, it is installed in superconducting magnet and formed piston dry-type superconducting magnetic separator, it is applied to high purity powder impurity removal field, to solve the contradiction between short distance pneumatic conveying and current reciprocating tank technology.​​

[0072] Piston dry-type superconducting magnetic separator, its external structure as shown in Figure 1 、 Figure 2 , internal structure as shown in Figure 3 , provided with precision tube assembly 2, and superconducting magnet 3; precision tube assembly 2 through the superconducting magnet 3, and position relative fixed; precision tube assembly 2 is installed with the piston-magnetic medium structure assembly 1 that can axial direction reciprocating motion.

[0073] Piston dry-type superconducting magnetic separator, preferably horizontally set, namely the axis of each component is horizontally set.

[0074] Superconducting magnet 3, for the strong magnet formed by superconducting wire winding, it has a cylindrical magnetic field cavity.

[0075] Precision tube assembly 2, the specific structure can further refer to Figure 6 , including precision tube 21, and the end cap assembly 22 at both ends; precision tube 21 is a long straight cylindrical with smooth inner wall, can pass through the cylindrical cavity in the middle of superconducting magnet 3, and the gap between the outer wall of precision tube 21 and the inner wall of cylindrical cavity of superconducting magnet 3 is very small, so that it can be easily disassembled; the symmetry section of precision tube 21 perpendicular to the axis coincides with the symmetry section of superconducting magnet 3.

[0076] End cap assembly 22 of precision tube assembly 2 is preferably detachably mounted at both ends of precision tube 21, the specific structure of end cap assembly 22 can refer to Figure 7 、 Figure 8 、 Figure 9 , using half structure to connect and fix, including end cap 221, half flange (also known as split flange) 222; end cap 221 is provided with an insertion end, which is inserted into the end of precision tube 21, the wall surface of the insertion end is provided with a sealing groove, and an end cap sealing ring 227 is embedded in the sealing groove to seal the gap between the end of precision tube 21 and the insertion end of end cap 221; the two half flanges 222 are connected and fastened by half flange bolts 223, so that the two half flanges 222 are clamped and tightly fixed outside the end of precision tube 21, and the end cap 221 and the half flange 222 are fixed by a plurality of end cap bolts 224, so as to fix the end cap 221 at the end of precision tube 21.

[0077] End cap 221 is provided with a driving inlet and outlet 225 to connect the internal cavity of precision tube 21 with the outside.

[0078] The end cap 221 is preferably provided with a positioning column 226.

[0079] Precision tube 21 is provided with 2 or 3 groups of inlets and outlets, and each group of inlets and outlets includes one inlet and one outlet.

[0080] To improve the efficiency of magnetic separation, the precision tube 21 is set longer, both ends of which are far beyond the superconducting magnet 3, and a magnetic separation area is formed at both ends, further referring to Figure 2 、 Figure 3 、 Figure 6 ; at the position beyond the end surface of the superconducting magnet 3 and close to the end surface, an inlet and an outlet are respectively arranged, so that the precision tube 21 located in the area of the superconducting magnet 3 is used as a magnetic separation area 26, the inlet is a feeding port 261, and the outlet is a discharging port 262; at both ends of the precision tube 21 outside the superconducting magnet 3, a first magnetic separation area 27 and a second magnetic separation area 28 are respectively formed, and the corresponding inlets are a first magnetic separation inlet 271 and a second magnetic separation inlet 281, and the corresponding outlets are a first magnetic separation outlet 272 and a second magnetic separation outlet 282.

[0081] The inlet and outlet on the precision tube 21 are preferably arranged in the direction of the tangent of the outer circle of the barrel body; each inlet and outlet on the precision tube 21 is preferably connected to the corresponding external equipment through an inlet and outlet assembly 23, as shown in Figure 10 、 Figure 11 、 Figure 12 ; the inlet and outlet assembly 23 includes a fixed half ring 231, a pipe-equipped half ring 232, and a sealing ring 236; the sealing ring 236 is sleeved outside the precision tube 21, the sealing ring 236 is provided with an opening 237 aligned with the inlet and outlet on the precision tube 21 and does not form an obstruction; the fixed half ring 231 and the pipe-equipped half ring 232 are paired and sleeved outside the sealing ring 236 and are connected and fixed by bolts 234, so as to be tightly held and fixed outside the precision tube 21 together with the sealing ring 236; the pipe-equipped half ring 232 is provided with a connecting pipe 233, the connecting pipe 233 penetrates the opening 237 and the inlet and outlet on the precision tube 21, and the connecting pipe 233 is aligned with the inlet and outlet; the axis of the connecting pipe 233 is parallel to the tangent of the outer circle of the barrel body of the precision tube 21; when high-pressure air enters the precision tube 21 through the connecting pipe 233, the movement direction is tangent to the inner wall of the precision tube 21, so as to form a spiral airflow.

[0082] The specific structure of the piston-magnetic aggregation medium structure assembly 1 can refer to Figure 13 、 Figure 14 、 Figure 15 ; to improve the efficiency of magnetic separation, two groups of magnetic aggregation media 14 are preferably arranged at both ends, and a dummy area is arranged in the middle; the dummy area is provided with a dummy area center shaft 11, and a magnetic balance ring 16 is arranged outside the dummy area; a separation area is symmetrically arranged at both sides of the dummy area, and a separation area center shaft 12 is arranged in the middle, and the separation area center shaft 12 is coaxial with the dummy area center shaft 11.

[0083] Two ends of each separation zone are provided with piston flanges 13 fixed at two ends of the separation zone central shaft 12, and the two piston flanges 13 are filled with the magnetic medium 14 to form the separation zone; the piston flange 13 cooperates with the inner wall of the precision tube 21 to form a sliding fit, and preferably the outer wall of the piston flange 13 is provided with a sealing groove in which a piston sealing ring 15 is embedded, and the piston sealing ring 15 forms an oil-free and self-lubricating dynamic sealing interface with the inner wall of the precision tube 21; preferably, two piston sealing rings 15 are arranged on each piston flange 13 for sealing, so that the inner cavity region of the precision tube 21 between the two piston flanges 13 forms an independent closed chamber, which is named as a separation chamber according to its key function of adsorbing impurities in a strong magnetic field. Preferably, the outer diameter of the magnetic medium 14 is slightly smaller than that of the piston flange 13, so that a gap is formed between the magnetic medium 14 and the inner cavity of the precision tube 21.

[0084] Preferably, the two piston flanges 13 near the dummy zone are welded with the dummy zone central shaft 11 as a whole; the magnetic balance ring 16 is a metal with a certain thickness, and the material thereof is preferably the same as that of the magnetic medium 14, and the magnetic balance ring 16 serves as a magnetic balance component; the thickness of the magnetic balance ring 16 matches the filling rate of the magnetic medium 14 in the separation zone; the magnetic balance ring 16 can be fixed on the dummy zone central shaft 11 in a detachable and adjustable manner by using a half structure fastened by bolts or a clamp.

[0085] Further, the separation zone central shaft 12 is detachably fixed on the piston flange 13 of the dummy zone or the dummy zone central shaft 11 by a threaded structure, and the piston flange 13 on the outer side (far from the dummy zone) of the separation zone can also be detachably fixed on the separation zone central shaft 12 by a threaded structure, so that the main components of the piston-magnetic medium structure assembly 1 can be disassembled and assembled, facilitating transportation, adjustment and replacement.

[0086] As shown in Figure 3 , Figure 4 , Figure 5 , the piston-magnetic medium structure assembly 1 is installed in the precision tube assembly 2 and can reciprocate along the axis, so as to have two working positions and form two working states, i.e., a working state one and a working state two.

[0087] One end of the piston-magnetic medium structure assembly 1 abuts against the end cover assembly 22 and is limited by the positioning column 226, at this time, one of the separation zones is located in the magnetic separation zone 26, and the other separation zone is located in the first impurity removal zone 27 or the second impurity removal zone 28.

[0088] The distance between the import and export is adjusted reasonably, so that the import and export of one group is located inside the piston flange 13 at both ends of the separation zone. Further, in order to make the discharge clean, the import and export overlap the piston flange 13 by 1-2 mm in the axial direction, and the diameter of the import and export is preferably smaller than the thickness of the piston flange 13.

[0089] When the piston-magnetic medium structure assembly 1 moves axially in the precision tube assembly 2, high-pressure air is injected through the driving import and export air port 225 on one end cover assembly 22, so that a driving air cavity is formed between the piston flange 13 and the end cover 221 on this side. Because the positioning column 226 abuts against the piston flange 13, it can be ensured that there is always a suitable driving air cavity section between the piston flange 13 and the end cover 221, thereby pushing the piston-magnetic medium structure assembly 1 to move to the other end. At this time, the volume of the chamber between the piston flange 13 on the other end and the other end is reduced, and the air in it is discharged outward through the other driving import and export air port 225.

[0090] The piston dry-type superconducting magnetic separator is assembled, debugged, and the superconducting magnet 3 is started in time at the work site.

[0091] When the piston dry-type superconducting magnetic separator is used for dry magnetic separation of high-purity powder, the connecting pipes 233 of each import and export and the driving import and export air ports 225 at both ends are connected to the outside through control valves. The feed port 261 is connected to the high-purity powder raw material bin, the raw material bin is connected to the high-pressure gas source, the discharge port 262 is connected to the high-purity powder finished product collection bin, the collection bin has an exhaust device, the first impurity removal air inlet 271 and the second impurity removal air inlet 281 are connected to the high-pressure gas source, the first impurity removal outlet 272 and the second impurity removal outlet 282 are connected to the impurity collection bin, and the impurity collection bin has an exhaust device. The driving import and export air port 225 is connected to the high-pressure gas source.

[0092] When the piston dry-type superconducting magnetic separator is used for dry magnetic separation of high-purity powder, the working process is as follows:

[0093] Step 1, one driving import and export air port 225 imports air, and the other driving import and export air port 225 discharges air, so that the piston-magnetic medium structure assembly 1 is stably positioned at one end of the precision tube assembly 2, as shown in the position shown in Figure 4 The control valve of the driving import and export air port 225 is closed, so that the position of the piston-magnetic medium structure assembly 1 is stable.

[0094] Step 2, working state one; open the control valves of the feeding port 261 and the discharging port 262, and the high-purity powder to be removed is output from the raw material bin, mixed with high-pressure air, and then input into the separation chamber in the magnetic separation zone 26 through the feeding port 261, and the gas flow with the powder spirals through the magnetic aggregation medium 14 in the separation zone. At this time, the magnetic aggregation medium 14 is located in the superconducting magnet 3, and can adsorb the magnetic impurities in the powder on the magnetic aggregation medium 14. After multiple adsorption, combined with the super-strong magnetic field in the superconducting magnet 3, the magnetic impurities in the high-purity powder can be completely removed, and the pure high-purity powder is discharged to the high-purity powder product collection bin through the discharging port 262.

[0095] At this time, the separation chamber in the impurity removal zone is referred to as Figure 4 , that is, the separation chamber in the first impurity removal zone 27 is away from the superconducting magnet 3, and the magnetic field strength is reduced to below 50Gs. The control valves of the first impurity removal inlet air port 271 and the first impurity removal outlet port 272 are opened, so that the pure high-pressure air is blown into the separation chamber in the impurity removal zone, and the gas flow spirals through the magnetic aggregation medium 14 and the inner wall of the precision pipe 21 in the separation zone. The magnetic impurities adsorbed on the magnetic aggregation medium 14 fall off under the action of gravity and high-pressure air flow, and finally enter the impurity collection bin through the first impurity removal outlet port 272 along with the gas flow.

[0096] At this time, there is no piston-magnetic aggregation medium structure assembly 1 in the impurity removal zone on the other side, so the inlet and outlet air ports need to be closed, that is, the second impurity removal inlet air port 281 and the second impurity removal outlet port 282 are closed.

[0097] Step 3, moving; after a period of time, a certain amount of magnetic impurities is adsorbed on the magnetic aggregation medium 14 in the magnetic separation zone 26, and the adsorption capacity decreases. In order to ensure the impurity removal quality, the piston-magnetic aggregation medium structure assembly 1 needs to be replaced. At this time, the control valves of all the inlet and outlet air ports on the precision pipe 21 are closed, and then, as shown in Figure 4 , the control valve of one end of the driving inlet and outlet air port 225 is opened and connected to the high-pressure air, and the other driving inlet and outlet air port 225 is exhausted. The piston-magnetic aggregation medium structure assembly 1 is driven by gas pressure until it moves to the other end, as shown in Figure 5 . The control valve of the driving inlet and outlet air port 225 is closed to stabilize the position of the piston-magnetic aggregation medium structure assembly 1.

[0098] In this process, Figure 4 , the magnetic aggregation medium 14 in the magnetic separation zone 26 gradually moves into the second impurity removal zone 28. After losing the strong magnetic field, part of the magnetic impurities adsorbed on the magnetic aggregation medium 14 will fall off under the action of gravity, but the magnetic impurities are always limited in the separation zone due to the piston sealing ring 15 between the piston flange 13 and the precision pipe 21.

[0099] In this process, Figure 4The magnetic gathering medium 14 in the first impurity removing area 27 in the magnetic gathering medium 14 gradually moves into the magnetic separation area 26, and even if there are still some unremoved magnetic impurities, the magnetic gathering medium 14 will be attracted to the magnetic gathering medium 14 due to the magnetic property of the magnetic gathering medium 14.

[0100] Step 4, working state two; the control valves of the feeding port 261 and the discharging port 262 are opened again, the high-purity powder to be removed is mixed with high-pressure air, and then is input into the separation cavity in the magnetic separation area 26 through the feeding port 261, and is in full contact with the magnetic gathering medium 14 just removed, the magnetic impurities in the powder are adsorbed on the magnetic gathering medium 14, and the high-purity powder removed is discharged to the high-purity powder product collecting bin through the discharging port 262.

[0101] At this time, the air inlet and outlet of the first impurity removing area 27 are closed, the air inlet and outlet of the second impurity removing area 28 are opened, high-pressure air is blown into the separation cavity in the second impurity removing area 28, the magnetic impurities adsorbed on the magnetic gathering medium 14 are blown off and enter the impurity collecting bin through the second discharging port 282.

[0102] The steps 1 to 4 are repeated, so that the piston-magnetic gathering medium structure assembly 1 performs gap reciprocating motion in the precision tube assembly 2, so that the magnetic gathering medium 14 on both sides of the piston-magnetic gathering medium structure assembly 1 alternately enters the superconducting magnet 3 to perform magnetic separation and impurity removal, and the magnetic gathering medium 14 outside the superconducting magnet 3 can also be fully washed by high-pressure gas to remove the magnetic impurities.

[0103] The piston dry-type superconducting magnetic separator formed by the piston dry-type impurity removing device of the superconducting magnetic separator has the following characteristics:

[0104] 1. The precision tube assembly 2 is a detachable structure, which facilitates the packaging and transportation of the magnetic separator;

[0105] 2. The piston-magnetic gathering medium structure assembly 1 is a detachable structure, which facilitates the replacement and maintenance of the magnetic gathering medium in the long-term operation of the magnetic separator;

[0106] 3. The six inlet and outlet positions on the precision tube are always fixed; the raw material bin and the product collecting bin of the high-purity powder are connected to the inlets and outlets on both sides of the separation cavity in the strong magnetic area, and the installation positions of the two bins can be close to the magnetic separator, so that only a short connecting pipeline is needed, and unlike the reciprocating tank connecting structure in the prior art, the connecting pipeline of the utility model has no movable part and does not need to use a flexible hose;

[0107] 4. The double-magnetic gathering medium 14 configuration retains the advantage of two adsorption times in one impurity removing period in the reciprocating tank technology, and compared with the single-magnetic gathering medium configuration, the production efficiency is doubled;

[0108] 5. To reduce metal chips generated by the impact of high-purity powder, the inner wall of the precision tube 21 is smooth; the dynamic sealing interface between the piston seal ring 15 and the precision tube 21 utilizes this smooth wall surface, and the dynamic sealing interface has the characteristics of being oil-free and self-lubricating, so as to avoid grease contamination of the high-purity powder.

[0109] 6. Set a certain length of dummy element zone so that the maximum value of the weak magnetic region where the off-field separation chamber is located is less than 50Gs; the magnetic balance ring 16 fitted on the central shaft 11 of the dummy element zone is used to reduce the peak axial residual magnetic field force acting on the piston-magnetic medium assembly 1 during the reciprocating motion, so as to reduce the peak gas driving force, thereby reducing the peak gas pressure, saving the energy consumption of pneumatic components, and increasing the intrinsic safety performance of the magnetic separator.

[0110] 7. The six inlets and outlets on the precision tube are all tangential to the outer circle to form a vortex of air-powder mixture in the separation chamber, increasing the probability of collision between powder and magnetic medium, and thus increasing the probability of impurities being adsorbed.

[0111] 8. The precision tube 21 has only a small gap with the inner wall of the superconducting magnet 3. This is to make full use of the strong magnetic space in the inner hole of the superconducting magnet and to facilitate the installation of the precision tube into the inner hole of the superconducting magnet. In the working position, the holes of the inlet and outlet coincide with the piston flange 13 axially by 1~2mm to ensure clean material discharge. The diameter of the hole is smaller than the thickness of the piston flange to avoid large fluctuations in the driving force caused by the connection between two adjacent gas chambers through the holes of the inlet and outlet during the movement of the piston-magnetic medium assembly.

[0112] 9. During the movement of the piston-magnetic medium structure assembly 1, the valves on the external pipelines connected to the six inlets and outlets on the tank body are all closed in order to maintain the continuity and stability of the aerodynamic force acting on the end piston flange.

[0113] 10. Using pneumatic power as the driving force for the piston-magnetic medium structure component 1, it borrows the existing precision tube similar to a cylinder, and also borrows the air source equipment for pneumatic conveying of powder. Compared with external driving methods (such as rope winding), it simplifies the equipment composition and reduces the equipment cost.

[0114] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A piston dry impurity removal device for superconducting magnetic separators, characterized in that, The application relates to a precision tube assembly comprising a piston-magnetic medium structure assembly and a precision tube. The piston-magnetic medium structure assembly is installed in the precision tube assembly and can reciprocate along an axial direction. The precision tube assembly comprises a precision tube and end cap assemblies fixed at both ends of the precision tube. The precision tube is a long straight cylindrical tube with smooth inner walls. Drive inlets and outlets are arranged in the end cap assemblies or on the precision tube wall close to the end cap assemblies. Three groups of inlets and outlets are arranged on the precision tube, one group comprising one inlet and one outlet. The inlets and outlets in the same group are arranged at intervals. The precision tube is divided into a magnetic separation zone and two impurity removal zones. Each of the two impurity removal zones is provided with one group of inlets and outlets. The inlets and outlets in the magnetic separation zone are respectively a feed inlet and a discharge outlet. The two impurity removal zones are respectively a first impurity removal zone and a second impurity removal zone. The inlets of the two impurity removal zones are respectively a first impurity removal inlet and a second impurity removal inlet. The outlets of the two impurity removal zones are respectively a first impurity removal outlet and a second impurity removal outlet.

2. The piston dry impurity removal device for superconducting magnetic separators according to claim 1, characterized in that, The piston-magnetic medium structure assembly is provided with two separation zones along an axial direction.

3. The piston dry impurity removal device for superconducting magnetic separators according to claim 1, characterized in that, The two separation zones are connected together.

4. The piston dry impurity removal device for superconducting magnetic separators according to claim 1 or 3, characterized in that, A separation zone central shaft is arranged in each separation zone. Piston flanges are arranged at both ends of the separation zone central shaft. Magnetic medium is filled between the two piston flanges. The outer wall of the piston flange and the inner wall of the precision tube form a sliding fit. The length of the separation zone matches the length of the magnetic separation zone or the impurity removal zone. When the separation zone overlaps with the magnetic separation zone or the impurity removal zone, one group of inlets and outlets is located between the two piston flanges of the separation zone.

5. The piston dry impurity removal device for superconducting magnetic separators according to claim 1, characterized in that, The end cap assemblies of the precision tube assembly are detachably installed at both ends of the precision tube. The inlets and outlets on the precision tube are arranged along the direction of the tangent of the outer circle of the tube body.

6. The piston dry impurity removal device for a superconducting magnetic separator according to claim 5, wherein Each inlet and outlet on the precision tube is connected to external equipment through an inlet and outlet assembly.

7. A piston dry impurity removal device for a superconducting magnetic separator according to claim 5 or 6, characterized in that, The inlet and outlet assembly comprises a fixed half ring, a pipe-equipped half ring and a sealing ring. The sealing ring is arranged outside the precision tube. The sealing ring is provided with an opening which is aligned with the inlet and outlet on the precision tube. The fixed half ring and the pipe-equipped half ring are arranged outside the sealing ring and are connected and fixed through bolts.

8. The piston dry impurity removal device for a superconducting magnetic separator according to claim 1, characterized in that, The pipe-equipped half ring is provided with a connecting pipe which is in communication with the opening on the sealing ring and the inlet and outlet on the precision tube. The connecting pipe is aligned with the inlet and outlet, and the axis of the connecting pipe is parallel to the tangent of the outer circle of the tube body.

9. The piston dry impurity removal device for a superconducting magnetic separator according to claim 1, characterized in that, Dummy zones are arranged between the two separation zones of the piston-magnetic medium structure assembly. A dummy zone central shaft is arranged in each dummy zone. The dummy zone central shaft is connected with the piston flange of the separation zone or the separation zone central shaft. A magnetic balance ring is arranged in each dummy zone. The magnetic balance ring is arranged outside the dummy zone central shaft. The dummy zone central shaft is fixed with the two piston flanges close to the dummy zone. The separation zone central shaft is detachably fixed on the piston flange close to the dummy zone or the dummy zone central shaft. The piston flange outside the separation zone is detachably fixed on the separation zone central shaft. The magnetic medium is detachably installed in the separation zone. A piston sealing ring is arranged between the outer wall of the piston flange of the separation zone and the inner wall of the precision tube. The piston sealing ring and the inner wall of the precision tube form a dynamic sealing interface. The inlets and outlets arranged on the precision tube wall overlap with the piston flange of the piston-magnetic medium structure assembly along an axial direction. The axial length of the inlet and outlet is smaller than the thickness of the piston flange.

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