CN201357111Y - Permanent-magnet high field-intensity magnetic filter - Google Patents

Abstract

A kind of permanent magnetic high-field strength magnetic filter, it is characterized in that: this magnetic filter comprises by adopting several permanent magnetic magnetic rings (8) connected in series in coaxial mode and extruded permanent magnetic rings stacked on each other The main magnetic system (25) formed by the high-permeability yoke pieces (9) between the magnetic rings, the inner ring cavity of the permanent magnetic ring (8) is used as a sorting space, and the two sides of the same yoke piece (9) The polarities of the magnetic rings are the same; the outer ring surface surrounding the permanent magnet magnetic ring is armored with several fan-shaped magnetic steels (7) to form auxiliary magnetic poles (26), so that each magnetic ring is squeezed by the upper, lower and outer three sides. Pressure to increase the magnetic flux in the sorting space, so as to obtain high magnetic field strength. Since the inner ring cavity of the permanent magnetic ring is used as the sorting space, the closed magnetic system is formed by three-sided homopolar extrusion technology in the magnetic system design, which ensures that the magnetic field strength on the central axis of the sorting cavity can reach 1.3T.

Description

Permanent magnet high field strength magnetic filter

technical field

The utility model relates to the magnetic separator technology, in particular to a permanent magnet high-field magnetic filter. The magnetic filter can be used for the purification of weak magnetic mineral powder, or for the analysis of magnetic mineral content in ore, and can also be used for the production of magnetized water, etc.

Background technique

In view of the fact that the permanent magnet system does not require excitation power consumption and cooling system, and has stable performance, compact and simple structure, low energy consumption in operation, convenient operation and maintenance, etc., the permanent magnetization of electromagnetic equipment is the relentless pursuit of people. The advent of performance NdFeB permanent magnet materials provides the basis for this. At present, almost all weak-field magnetic separation equipment and most medium-field-strength magnetic separators use permanent magnet systems, but high-field-strength magnetic separators are still dominated by electromagnetic magnetic systems. How to use permanent magnet materials for reasonable The design of the magnetic system and magnetic circuit enables the separation area to obtain high magnetic field strength, which has become one of the focuses of permanent magnetic separator research.

Common permanent magnet high field strengths include: flat ring permanent magnet high gradient magnetic separator, YG type permanent magnet double vertical ring high gradient magnetic separator, multivariate high gradient permanent magnet strong magnetic separator, opposite pole permanent magnet magnetic separator wait.

Chen Jin, Sun Zhongyuan, Feng Dingwu and others from Central South University of Technology developed a flat-ring permanent magnet high-gradient magnetic separator. The magnetic system structure chooses a wave-shaped magnetic field multi-pole permanent magnet magnetic system, and the entire magnetic system is composed of inner and outer magnetic systems. Closed magnetic system, the inner and outer magnetic systems are magnet armored extruded magnetic systems, the field strength on the center line is distributed in a sinusoidal curve, the wavy magnetic field makes the field strength in the separation space non-uniform distribution, and the particles are separated in the separation space. The magnetic force received also undergoes periodic changes from strong to weak, and from weak to strong, and the materials in the sorting space will sometimes be loose and sometimes tight, which is beneficial to remove inclusions. The separation gap between the inner and outer magnetic systems can be adjusted to meet the requirements of different materials for the separation field strength. The magnetic medium vibration system is composed of an eccentric wheel, a vibration motor and a return spring. The inner cylinder and the magnetic medium are fixed together and vibrate axially together with the magnetic medium, while the outer cylinder is fixed. The main technical parameters are the highest background field strength: 1T, inner cylinder diameter × length: 282mm × 450mm, cylinder speed: 30r/min, vibration motor power: 1.5kw, magnetic medium vibration frequency: 24Hz, processing capacity: 1.5t/h , Sorting space width (radial) × length: 20mm × 450mm, transmission power: 2.5KW, magnetic medium vibration amplitude: 1.5mm.

Ma'anshan Mining Research Institute has developed a YG type permanent magnet double vertical ring high gradient magnetic separator, which is mainly composed of a permanent magnet system, a pulsation mechanism, a rotary ring drive mechanism and other supporting components. Among them, the permanent magnet system is composed of upper and lower yokes, magnetic poles, guide plates and magnetic pole protection covers. The upper and lower magnetic poles are mainly composed of NdFeB and ferrite magnetic blocks. When the magnetic pole spacing is 90mm, the average background field generated The strength is about 0.56T; the swivel ring is divided into 24 sorting chambers, which are welded by magnetically conductive stainless steel, and each sorting chamber is filled with magnetically conductive steel mesh and non-magnetically conductive steel mesh; the pulsation mechanism consists of a platform stroke phase, a drive rod and diaphragm etc.

Chang Wenchen proposed the concept of micro-guide series-parallel permanent magnet magnetic circuit technology and multi-element high-gradient magnetic gathering medium in the patent application materials of the multi-element permanent magnet high-gradient magnetic separator. Its magnetic system is to drop a magnetic gathering plate on the basic magnetic source strontium ferrite, and then drop a smaller size high-field-strength NdFeB permanent magnet to form a composite magnetic source. The background field can reach 0.7-0.9T. Connect n pairs (n=2, 4, 6... etc. even numbers) of the same composite magnetic source directly in series; there is no need for a yoke iron and a magnetic plate to connect between the magnetic systems to form a series non-conductive magnetic circuit, forming multiple sorting spaces, and connecting them in series When two adjacent composite magnetic sources share a piece of strontium ferrite, that is, a magnetism collecting plate is dropped on both sides of a piece of strontium ferrite, and then a smaller size high-field-strength NdFeB permanent magnet is dropped to form The composite magnetic source is connected in series, and then an even number of non-conductive series magnetic circuits are directly connected in parallel, and there is no need for yoke iron and magnetic permeable plates between the parallel magnetic circuits, thus forming a completely closed series-parallel magnetic circuit with multiple sorting work areas. An even number of non-conductive series magnetic circuits can form a series-parallel magnetic circuit only through the closing action of the two outermost magnetic plates or yoke iron; multiple non-conductive magnetic circuits in the overall structure form a completely closed magnetic circuit, the highest background field Strong 0.9T.

The Czech Republic uses two opposite-pole permanent magnets and iron yokes to form a large cavity window frame magnet structure, and a sorting box with the same shape as the cavity surrounded by the magnetic system is arranged in it, and the sorting box is filled with magnetic accumulation media. A single magnetic pole is a large magnetic block composed of multiple small NdFeB magnetic blocks. Each magnetic block is put into a stainless steel box and then welded on U-shaped steel plates of different specifications. Then two U-shaped steel plates are assembled into two A closed magnetic circuit composed of two large magnetic blocks that can move each other, when the sorting gap is 30mm, the uniform magnetic induction intensity of the closed magnetic field background can reach 0.9T. On this basis, Changsha Research Institute of Mining and Metallurgy and Moscow University of Mining and Technology jointly developed a CRIMM double-box reciprocating permanent magnet high-gradient magnetic separator and applied it to the iron removal production of non-metallic ores such as feldspar, nepheline and kaolin. It is composed of two reciprocating linear motion sorting boxes, supporting limit guide rails, etc.; the double sorting box is equipped with a multi-dimensional magnetic separation medium stack. When the sorting box enters the magnet, the magnetic induction intensity on the surface of the medium reaches 1.3T or more, and the magnetic field gradient reaches More than 10 ⁶ T/m. The uniform background magnetic induction intensity of the closed magnetic field is above 0.8T.

There is also a belt-type permanent-magnet high-gradient magnetic separator that also adopts a pole-type magnetic system structure. This machine is mainly composed of a permanent magnetic system, a non-polar magnetic gathering medium belt, an electromagnetic vibration coil and a frame. The magnetic system is composed of armored NdFeB magnets (magnetic energy product 255kJ/m ³ , residual magnetic induction 1.1T). The background field strength of the sorting magnetic field can be adjusted by adjusting the magnetic pole spacing (20-150mm) up and down the magnetic system. (0.35～0.70T), the medium belt is braided by steel wool medium, and two electromagnetic vibration coils are installed on the medium belt, the high-frequency and low-amplitude vibration generated by it can improve the selectivity of material sorting.

Chinese patent CN2522172Y discloses a strong magnetic roller. This kind of magnetic roller is composed of rare earth permanent magnet strong magnetic ring and yoke piece of high magnetic permeability material connected in series. The ring-shaped magnetic yoke pieces and the ring-shaped rare-earth permanent magnets are alternately arranged, and the non-magnetic core shaft passes through the center of the two rings, and the two ends of the core shaft are fixed with non-magnetic threaded end caps. The main feature of this kind of strong magnetic roller is that it uses the permanent magnet repulsion state magnetization technology. The annular rare earth permanent magnet strong magnets arranged on both sides of any ring-shaped magnetic yoke are of the same polarity. The repulsive state magnetic concentration technology makes the magnetic yoke The magnetic flux emitted by the annular rare earth permanent magnets on both sides of the sheet is forced to "extrude" from the outer peripheral surface of the annular yoke sheet, thus forming the working magnetic induction and magnetic field gradient of the strong magnetic force roller. The use of non-magnetic core shaft and end cover is mainly to prevent magnetic flux leakage. The working field strength of this strong magnetic roller can reach 2T, and the magnetic field gradient can reach 10 ³ T/m. With this strong magnetic roller as the core, permanent tape type and drum type magnetic separators can be formed.

To sum up, most of the current permanent magnet strong magnetic separators adopt a closed-circuit magnetic system structure, and the separation space is constructed by two or more separate magnets. Magnetic technology, but the field strength in the sorting area is mostly below 1T, which is difficult to meet the needs of sorting weak magnetic powders, and the design of the magnetic system needs to be further optimized.

Contents of the invention

The purpose of this utility model is to design the magnetic system and magnetic circuit by using armored leak plugging and extrusion magnetic gathering technology, so as to obtain a high field strength of 1.3T in the sorting area, thereby improving the sorting effect and expanding the permanent magnet magnetic separation equipment It can be used in the analysis of magnetic mineral content in ore and the production of magnetized water and fertilizer.

The purpose of this utility model can be achieved through the following technical measures:

The permanent magnet high-field strength magnetic filter of the utility model includes several permanent magnet magnetic rings connected in series in the form of coaxial lines and a high-permeability yoke squeezed between every two permanent magnet magnetic rings stacked on each other. The main magnetic system composed of yoke pieces, the inner ring cavity of the permanent magnet ring is used as a sorting space, and the polarity of the magnetic rings on both sides of the same yoke piece is the same; the outer ring surface of the permanent magnet ring is armored with fan-shaped magnetic steel It is installed to form auxiliary magnetic poles, so that each magnetic ring is squeezed from the upper, lower and outer sides to increase the magnetic flux in the sorting space, thereby obtaining high magnetic field strength.

The permanent magnetic ring described in the utility model adopts an axial magnetization method, and the fan-shaped magnetic steel adopts two types of radial magnetization methods, one inner wall is N poles, and the other outer wall is N poles. The fan-shaped magnets in the magnetization direction are tightly surrounded by the permanent magnet ring, and the number of fan-shaped magnets in each row is: 360°/angle° blocks (angle° is the central angle of the fan-shaped magnets, and the N poles of the inner and outer walls depend on the Due to the polarity of the annular magnetic steel extruded on the high yoke magnetic sheet), the inner diameter of the fan-shaped magnetic ring is equivalent to the outer diameter of the permanent magnetic ring, and the thickness is slightly about the thickness of the permanent magnetic ring.

The inner and outer diameters of the permanent magnet ring and the high-permeability yoke are the same, and the permanent magnet ring and the high-permeability yoke are alternately connected in series by using the permanent magnet repulsion state magnetization technology, and arranged in any ring-shaped high-permeability yoke. The permanent magnetic rings on both sides of the yoke are of the same polarity, and the shaft hole surrounded by the permanent magnetic ring and the inner diameter of the high-permeability yoke is used as a sorting space, and the sorting space can be filled with a magnetic medium.

The auxiliary magnetic poles are composed of several 360°/angle° fan-shaped magnets with the same specification and a central angle of angle°. The thickness of the fan-shaped magnets is the sum of the thickness of a permanent magnetic ring and a high-permeability yoke , and one-half of the thickness of the fan-shaped magnetic steel corresponds to the position of the superimposed surface of every two permanent magnetic rings, that is, the position of the high magnetic permeability yoke piece.

In the utility model, a sorting area protective cover made of metal material is placed in the inner ring cavity of the permanent magnet magnetic ring and is interference-fitted with the permanent magnetic ring inner ring cavity; a magnetic gathering medium cylinder is installed in the sorting area protective cover.

The beneficial effects of the utility model are as follows:

Since the inner ring cavity of the permanent magnetic ring is used as the sorting space, the closed magnetic system is formed by three-sided homopolar extrusion technology in the magnetic system design, which ensures that the magnetic field strength on the central axis of the sorting cavity can reach 1.3T.

Description of drawings

Fig. 1 is the overall structural representation of the utility model.

Fig. 2 is a sectional view along A-A of Fig. 1 .

FIG. 3 is a top view of FIG. 1 .

Fig. 4 is a schematic diagram of the structure of the magnetic system of the unit.

FIG. 5 is a top view of FIG. 4 .

Serial numbers in the figure: 1. Rack, 2. Large gland, 3. Cylinder flange, 4. Annular magnetic steel pressure ring, 5 Sector-shaped magnetic steel pressure ring, 6. Cylinder, 7. Sector-shaped magnetic steel, 8. Permanent Magnetic ring (annular magnetic steel), 9. High-permeability magnetic yoke piece, 10. Fan-shaped magnetic steel backing ring, 11. Annular magnetic steel backing ring, 12. End cover, 13 Sheath, 14. Sorting chamber protective sleeve, 15. Feeding funnel, 16. Magnetic gathering medium cylinder, 17. Cylinder connecting thread, 18. Thin iron sheet, 19. Cylinder sorting area, 20. Rack bracket, 21. End cover connecting bolt, 22. Ring magnet Steel inner wall, 23, annular magnetic steel outer wall, 24 fan-shaped magnetic steel inner wall, 25, main magnetic system, 26, auxiliary magnetic pole, 27, casing, 28, axial magnetization direction, 29, radial magnetization direction.

Detailed ways

The utility model will be further described below in conjunction with embodiment (accompanying drawing):

The utility model utilizes the characteristics of high magnetic energy product and high intrinsic coercive force of high-performance NdFeB magnetic material, and adopts NdFeB permanent magnetic ring and fan-shaped magnetic steel to construct a sorting magnetic system.

As shown in Figures 1, 2 and 3, the permanent magnet high field strength magnetic filter of the present utility model comprises a frame 1, a casing 27 installed on the frame mountain, and a main magnetic system 25 and an auxiliary magnetic pole 26 positioned in the casing , sorting cavity protection cover 14, feeding funnel 15 and magnetic gathering medium cylinder 16; Described main magnetic system 25 comprises by adopting several permanent magnetic rings (rare earth permanent magnetic strong magnets) that are connected in series in coaxial mode ) 8 and high permeability yoke pieces 9 squeezed between every two permanent magnet rings stacked on each other, the inner ring chamber of the permanent magnet ring 8 is used as a sorting space, and the magnets on both sides of the same yoke piece 9 The ring polarity is the same; the auxiliary magnetic pole 26 is composed of several 360°/angle° blocks with the same specifications and a fan-shaped magnetic steel 7 with a central angle of angle°. The thickness of the fan-shaped magnetic steel 7 is a permanent magnetic ring 8 and a The sum of the thicknesses of the high-permeability yoke pieces 9, and one-half of the thickness of the fan-shaped magnetic steel 7 corresponds to the position of the overlapping surface of every two permanent magnetic rings 8, that is, the position of the high-permeability yoke pieces 9, so that Each magnetic ring is extruded on the upper, lower and outer sides (the magnetic rings at both ends of the magnetic system are extruded by two sides with the same polarity) to increase the magnetic flux in the sorting space, thereby obtaining high magnetic field strength.

The permanent magnetic ring 8 in the utility model adopts an axial magnetization method, and the fan-shaped magnetic steel 7 adopts two types of radial magnetization methods, one inner wall is an N pole, and the other outer wall is an N pole. The fan-shaped magnets in the magnetization direction are tightly surrounded by the permanent magnet ring, and the number of fan-shaped magnets in each row is: 360°/angle° blocks (angle° is the central angle of the fan-shaped magnets, and the N poles of the inner and outer walls depend on the Because the polarity of the annular magnetic steel is extruded on the high yoke magnetic sheet), the inner diameter of the fan-shaped magnetic ring is equivalent to the outer diameter of the permanent magnetic magnetic ring, and the thickness is slightly about the thickness of the permanent magnetic magnetic ring; the permanent magnetic magnetic ring 8 and high The inner and outer diameters of the magnetically permeable yoke pieces 9 are the same, and the permanent magnetic rings 8 and the high magnetically permeable yoke pieces 9 are alternately connected in series by using the permanent magnet repulsion state magnetization technology, and arranged on both sides of any ring-shaped high magnetically permeable yoke piece 9 The permanent magnetic rings 8 are all of the same polarity, and the shaft holes surrounded by the inner diameters of the permanent magnetic rings 8 and the high-permeability yoke pieces 9 are used as sorting spaces, which can be filled with magnetic gathering media.

In order to protect the main magnetic system, a sorting area protective cover 14 made of a thin steel pipe that is interference fit with the inner ring cavity of the permanent magnet magnetic ring 8 is placed in the inner ring cavity of several permanent magnet magnetic rings; A magnetic-gathering medium cylinder 16 is installed in it, and the magnetic-gathering medium is packaged in the magnetic-gathering medium cylinder 16. A sheath 13 is sheathed on the upper end of the protective sheath 14 for the sorting area, and the feeding funnel 15 is inserted into the upper port of the protective sheath 14 for the sorting area.

The length of the sorting chamber in the utility model is the sum of the thicknesses of the permanent magnetic ring 8 and the high magnetic permeability yoke piece 9 that constitute the main magnetic system. The magnetic field strength of the sorting area can be adjusted by using different magnetic materials, and the magnetic field strength of the sorting area can also be adjusted by using different specifications of magnetic rings 8, fan-shaped magnetic steel 7 and high-permeability yoke pieces 9, such as: changing the magnetic field The thickness of the ring 8 and the high magnetic permeability thin yoke sheet 9, etc.

When assembling, the magnets are loosely arranged in the casing according to the polarity requirements, and then the main magnetic system and the auxiliary magnetic system are gradually and accurately positioned by using special tooling fixtures and ingenious assembly forms, and they are encapsulated in the upper and lower glands. inside the case.

The high-field-strength magnetic separator is a periodical operation, and the operation steps are as follows: place the magnetic separator horizontally or vertically (the sorting chamber is placed horizontally or vertically, and the schematic diagram is vertical), and the diameter is slightly smaller than that of the separator. The magnetic gathering medium cylinder 16 with the inner diameter of the selection chamber is placed in the sorting chamber, and then the material is fed into the magnetic gathering medium cylinder 16 through the feeding funnel 15, and the material can be transported by wind (dry separation) or in the form of ore pulp (wet separation) Flowing through the magnetic accumulation medium cylinder 16, when the magnetic separator is placed horizontally, the material can enter from top to bottom, and can also enter from bottom to top (the schematic general diagram is self-weight feeding), and the non-magnetic material smoothly passes through the gap of the magnetic accumulation medium to become Non-magnetic products, while magnetic minerals are adsorbed on the magnetic gathering medium under the action of the magnetic field force. After the magnetic gathering medium is saturated, stop feeding, take the magnetic gathering medium cylinder out of the sorting chamber, and adsorb on the magnetic gathering medium The magnetic material on the surface falls off under the action of its own gravity and becomes a magnetic product.

In practical applications, multiple sorting chambers can be connected in parallel to realize continuous operation and improve the processing capacity of the equipment.

The assembly of the permanent magnet high-field-strength magnetic separator of the present utility model can only be realized by means of a set of special fixtures and a corresponding standard assembly process.

The permanent magnetic filter of the utility model adopts the inner diameter of the radially magnetized magnetic ring as the sorting cavity, and the periphery of the magnetic ring is armored with axially magnetized fan-shaped magnets, and the magnetic field strength in the sorting area can reach 1.3T.

Claims (5)

1, a kind of permanent magnetic high-field strength magnetic filter is characterized in that: this magnetic filter comprises by adopting several permanent magnetic magnetic rings (8) connected in series in coaxial mode and extruded on every two mutually stacked The main magnetic system (25) formed by the high permeability yoke pieces (9) between the permanent magnet rings, the inner ring cavity of the permanent magnet rings (8) is used as a sorting space, and the same yoke piece (9) two The polarities of the magnetic rings on the side are the same; the outer ring surface surrounding the permanent magnetic ring is armored with several fan-shaped magnetic steels (7) to form auxiliary magnetic poles (26), so that each magnetic ring is protected by the upper, lower and outer three sides. Squeeze to increase the magnetic flux in the sorting space, so as to obtain high magnetic field strength. 2. The permanent magnet high-field magnetic filter according to claim 1, characterized in that: the permanent magnet ring (8) adopts an axial magnetization method, and the fan-shaped magnetic steel (7) adopts two forms of radial magnetization. Magnetization method, one inner wall is N pole, the other is N pole outer wall, the inner diameter of the fan-shaped magnetic ring is equivalent to the outer diameter of the permanent magnetic ring, and the thickness is slightly about the thickness of the permanent magnetic ring. 3. The permanent magnet high-field magnetic filter according to claim 1, characterized in that: the inner and outer diameters of the permanent magnetic ring (8) and the high magnetic permeability yoke piece (9) are the same, and permanent magnets are used The repulsive state magnetic concentration technology alternately connects the permanent magnet ring (8) and the high-permeability yoke piece (9) in series, and the permanent magnet ring (8) arranged on both sides of any ring-shaped high-permeability yoke piece (9) is With the same polarity, the shaft hole surrounded by the inner diameter of the permanent magnetic ring (8) and the high-permeability yoke piece (9) is used as a sorting space, and the sorting space can be filled with magnetic accumulation medium. 4. The permanent magnet high-field-strength magnetic filter according to claim 1, characterized in that: the auxiliary magnetic poles (26) are fan-shaped magnets ( 7) Composition, the thickness of the sector magnet (7) is the sum of the thickness of a permanent magnetic ring (8) and a high magnetic permeability yoke (9), and one-half of the thickness of the sector magnet (7) The position corresponds to the position of the overlapping surface of every two permanent magnet rings (8), that is, the position of the high magnetic permeability yoke piece (9). 5. The permanent magnet high-field-strength magnetic filter according to claim 1, characterized in that: in the inner ring cavity of the permanent magnet ring (8), there is an interference fit with the inner ring cavity of the permanent magnet ring (8). A sorting area protective cover (14) made of metal material; a magnetic gathering medium cylinder (16) is installed in the sorting area protective cover (14).

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