Dry magnetic separator

Abstract

The invention provides a dry magnetic separator, which solves the problem of material aggregation and huddling caused by electrostatic adsorption and magnetic agglomeration of fine powder, and comprises a shell, the vibration feeding groove is formed in the inner upper part of the machine shell; the magnetic roller is rotationally arranged in the machine shell; the top of the vibrating screen is hung on the machine shell, the vibrating screen is located on the periphery of the magnetic roller, and the driving part is fixed to the machine shell, connected with the vibrating screen and used for driving the vibrating screen to reciprocate in the axial direction of the magnetic roller; and the multiple gap adjusting balls are installed on the side, facing the magnetic roller, of the vibrating screen, and the gap adjusting balls make rolling contact with the magnetic roller so that a gap can be kept between the inner curved surface of the vibrating screen and the magnetic roller. In the process that materials fall into the vibrating screen, are transversely pushed and stirred by dense vertical screen bars of the vibrating screen at high frequency, and descend on the surface of the magnetic roller, the materials do reciprocating motion multiple times in the axial direction of the magnetic roller, the whole body is in a boiling state, and the gathering and huddling phenomenon of fine powder is thoroughly eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic material separation equipment, and is particularly suitable for use in dry magnetic separators. Background Art

[0002] With the rapid development of coal power industry, fly ash contains a large amount of iron resources, most of which are mixed with cement mixture and abandoned, and a small amount is directly landfilled, resulting in a huge waste of resources. In order to separate the iron resources from fly ash, a dry magnetic separator dedicated to fly ash came into being.

[0003] Magnetic separators are divided into wet magnetic separators and dry magnetic separators. The technology of wet magnetic separators is very mature and has a good effect on the separation of magnetic particles. However, in remote mountainous areas with inconvenient transportation and large-scale ultra-poor iron-manganese mines with drought and water shortage, wet magnetic separators cannot be used. The amount of fly ash discharged by thermal power plants across the country is very huge every year, and the total iron content is generally not high. Due to water conditions and operating costs, the economic benefits of wet magnetic separation are not high. In such cases, the mission of iron selection can only fall on dry magnetic separators.

[0004] The dry magnetic separator in the existing technology has a good effect on separating magnetic particles in materials with a particle size of more than 20 meshes. The technology is mature and widely used. However, for materials with a particle size below 20 meshes, it is difficult to separate magnetic particles from non-magnetic particles due to the small particle size of fine powder dry materials, electrostatic adsorption and magnetic agglomeration phenomena, and the magnetic separation effect on fine powder materials is very poor.

[0005] Therefore, how to provide a dry magnetic separator suitable for materials with a particle size below 20 mesh is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The present invention provides a dry magnetic separator, which is used to solve the problem that dry materials with a particle size below 20 mesh are difficult to separate during the magnetic separation process in the prior art. By adopting measures to eliminate the aggregation phenomenon of fine powder materials, magnetic particles can be separated from the materials, thereby achieving the enrichment of iron-containing particles and meeting industrial utilization standards.

[0007] The present invention provides a dry magnetic separator, comprising: The casing has a feed inlet on the top; A vibrating feed trough is arranged inside the housing, and the top of the vibrating feed trough is arranged corresponding to the feed inlet; A magnetic drum is rotatably disposed inside the housing, and the interior of the magnetic drum has a partial magnetic field, and the area of ​​the magnetic field always maintains a constant position relative to the housing; A vibrating screen, the top of which is hung on the housing, and the vibrating screen is located on the outer periphery of the magnetic drum having a magnetic field, and the top side of the vibrating screen is arranged corresponding to the bottom side of the vibrating feed trough; A driving member connected to the vibrating screen, and the driving member is used to drive the vibrating screen to reciprocate along the axial direction of the magnetic drum; A plurality of gap-adjusting balls are installed on a side of the vibrating screen facing the magnetic drum, and the gap-adjusting balls are in rolling contact with the magnetic drum so as to maintain a gap between the inner curved surface of the vibrating screen and the magnetic drum.

[0008] A dry magnetic separator provided according to the present invention also includes an electrostatic grounding device for introducing the static charge in the fine powder adsorbed on the surface of the magnetic drum into the ground.

[0009] According to a dry magnetic separator provided by the present invention, the electrostatic grounding device comprises: A carbon brush, one side of which is connected to the magnetic roller, and the other side of which is connected to the housing; A grounding wire is connected to the casing by welding.

[0010] According to a dry magnetic separator provided by the present invention, the vibrating screen is connected to the driving member via a crankshaft.

[0011] A dry magnetic separator provided according to the present invention further includes a connecting member, one end of which is connected to the casing, and the other end of which is fixedly connected to the top of the vibrating screen by screws.

[0012] According to a dry magnetic separator provided by the present invention, the amplitude of the vibrating screen is 0.6 cm-2 cm; and the gap between the vibrating screen and the magnetic drum is 1±0.1 mm.

[0013] According to a dry magnetic separator provided by the present invention, the driving component includes an exciting motor, and the vibration frequency of the exciting motor is 1000 times / minute.

[0014] According to a dry magnetic separator provided by the present invention, a plurality of gap-adjusting balls are evenly distributed on the inner side of the vibrating screen.

[0015] A dry magnetic separator provided according to the present invention further includes a permanent magnet for generating a magnetic field for the magnetic drum, the vibrating screen covers half of the surface area of ​​the magnetic drum, and the vibrating screen is arranged corresponding to the permanent magnet.

[0016] A dry magnetic separator provided by the present invention further comprises: A material dividing plate, arranged on the bottom side of the vibrating screen; A product hopper is arranged on a side of the material distribution plate away from the vibrating screen and is used to receive the product; The tail hopper is arranged on a side of the distribution plate close to the vibrating screen and is used for receiving waste materials.

[0017] The dry magnetic separator provided by the present invention has a feed port opened on the top of a casing, a vibrating feed trough is arranged inside the casing, the top of the vibrating feed trough is arranged corresponding to the feed port, a magnetic drum is rotatably arranged inside the casing, a partial magnetic field is provided inside the magnetic drum, and the magnetic field region always keeps a constant position relative to the casing, the top of the vibrating screen is hung on the casing, and the vibrating screen is located on the outer periphery of the side of the magnetic drum having the magnetic field, the top side of the vibrating screen is arranged corresponding to the bottom side of the vibrating feed trough, a driving member drives the vibration to reciprocate along the axial direction of the magnetic drum, and a plurality of gap adjustment The rolling ball is set on the side of the vibrating screen facing the magnetic drum, and the gap-adjusting ball is in rolling contact with the magnetic drum to keep a gap between the inner curved surface of the vibrating screen and the magnetic drum. The material falls into the vibrating screen and is pushed and stirred horizontally by the dense vertical screen bars of the vibrating screen at a high frequency. The mechanical force applied to the material is much greater than the combined force of the electrostatic adsorption force and the magnetic agglomeration force between the material particles. Therefore, during the movement of the material on the surface of the magnetic drum, the material undergoes multiple reciprocating movements along the axial direction of the magnetic drum, and the whole is in a boiling state, which completely eliminates the aggregation and clumping phenomenon of fine powder. As the magnetic particles roll up and down, they are attracted by the magnetic force inside the magnetic drum and continuously move to the surface of the magnetic drum, squeezing out the non-magnetic or weak magnetic particles, forming more and more magnetic particles on the surface of the magnetic drum, and finally falling into the product hopper in the unloading area. The non-magnetic and weak magnetic particles are forced to move outward and fall into the tail hopper under the action of gravity, thus successfully achieving the purpose of efficient magnetic separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural diagram of the dry magnetic separator provided by the present invention.

[0020] Figure 2 It is an axial view of the dry magnetic separator provided by the present invention.

[0021] Reference numerals: 1. Casing; 2. Feed inlet; 3. Vibrating feed trough; 4. Magnetic drum; 5. Vibrating screen; 6. Driving part; 7. Gap adjustment ball; 8. Connecting part; 9. Permanent magnet; 10. Dividing plate; 11. Product hopper; 12. Tail hopper. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a dry magnetic separator, including a casing 1, a vibrating feed trough 3, a magnetic drum 4, a vibrating screen 5, a driving member 6 and a plurality of gap-adjusting balls 7.

[0025] The housing 1 is an integral frame, and a feed port 2 is provided on the top thereof for introducing the materials to be selected into the equipment. A vibrating feed trough 3 is arranged inside the housing 1, and the top of the vibrating feed trough 3 is arranged corresponding to the feed port 2, so as to ensure that the materials can smoothly enter and be evenly distributed on the vibrating feed trough 3. With the slight vibration of the vibrating feed trough 3, the materials are gradually transported to the surface of the lower magnetic drum.

[0026] The magnetic drum 4 is rotatably arranged inside the housing 1. The interior of the magnetic drum 4 has a partial magnetic field, and the magnetic field area always keeps the same position relative to the housing 1. When the magnetic drum 4 rotates, the material is fed into the magnetic field area, and the magnetic particles therein are adsorbed to the surface of the magnetic drum 4 under the action of the magnetic field. As the magnetic drum 4 continues to rotate, the adsorbed magnetic particles gradually move to the other side without the magnetic field as the surface of the magnetic drum 4 moves. In this process, the magnetic particles and the non-magnetic particles are gradually separated. The separated magnetic particles are collected at a position of the magnetic drum 4 away from the magnetic field area, while the non-magnetic particles fall vertically into the tailing bin under the action of gravity and centrifugal force, thereby achieving effective separation of the two.

[0027] The top of the vibrating screen 5 is hung on the housing 1, and the vibrating screen 5 is located on the outer periphery of the magnetic drum 4, ensuring that the vibrating screen 5 can work around the magnetic drum 4 to separate the materials. The top side of the vibrating screen 5 is arranged corresponding to the bottom side of the vibrating feed trough 3, that is, the upper edge of the vibrating screen 5 is placed on the lower edge of the vibrating feed trough 3, so that the materials falling from the vibrating feed trough 3 can directly fall on the vibrating screen 5 for subsequent sorting.

[0028] It should be noted that the curvature of the vibrating screen 5 is consistent with that of the magnetic drum 4 so that the gap between the two can be more easily adjusted.

[0029] The driving member 6 is connected to the vibrating screen 5, and is used to drive the vibrating screen 5 to reciprocate along the axial direction of the magnetic drum 4, so that the material on the vibrating screen 5 is continuously vibrated and impacted by the screen bars, thereby eliminating the aggregation and clumping of fine powder. The magnetic particles are constantly moving toward the surface of the magnetic drum 4 under the attraction of the magnetic force in the magnetic drum 4 during the up and down rolling, squeezing out the non-magnetic or weak magnetic particles, forming more and more magnetic particles on the surface of the magnetic drum 4, while the non-magnetic and weak magnetic particles are forced to move outward and fall into the tail hopper 12 under the action of gravity, thereby achieving the enrichment of magnetic particles.

[0030] A plurality of gap adjustment balls 7 are arranged on the side of the vibrating screen 5 facing the magnetic drum 4, and the gap adjustment balls 7 are in rolling contact with the magnetic drum 4, so that a fixed gap is maintained between the inner curved surface of the vibrating screen 5 and the magnetic drum 4, and wear or failure caused by direct contact between the vibrating screen 5 and the magnetic drum 4 is prevented. Due to the rolling characteristics of the gap adjustment balls 7, there is point contact and rolling friction between the gap adjustment balls 7 and the magnetic drum 4, which not only avoids direct contact wear between the vibrating screen 5 and the magnetic drum 4, but also ensures that the vibrating screen 5 and the magnetic drum 4 maintain an optimal distance, so that the vibrating screen 5 can play the greatest role in stirring the materials in the horizontal movement.

[0031] It is understandable that the relative position of the gap adjusting ball 7 and the vibrating screen 5 can be adjusted to achieve the function of adjusting the gap between the vibrating screen 5 and the magnetic drum 4. For example, the ball can be connected to the inner side of the vibrating screen 5 through a retractable structure, and the gap can also be adjusted by balls of different sizes.

[0032] In addition, the gap-adjusting balls 7 can be arranged in three rows, namely, upper, middle and lower, along the axial direction of the magnetic drum 4 to control the inner curved surface of the vibrating screen 5 and the magnetic drum 4 to always maintain a certain gap.

[0033] In a feasible embodiment of the present invention, it also includes an electrostatic grounding device for introducing the static charge in the fine powder adsorbed on the surface of the magnetic drum 4 into the ground, and draining the static charge through the electrostatic grounding device to break the electrostatic adsorption between the particles.

[0034] Furthermore, the electrostatic grounding device includes a carbon brush and a grounding wire. One side of the carbon brush is connected to the magnetic roller 4 and is in close contact with the magnetic roller 4, ensuring that the static charge on the surface of the magnetic roller 4 can be effectively collected. The other side of the carbon brush is connected to the housing 1, so that the collected static charge can be conducted to the housing 1 through the carbon brush; the grounding wire is welded to the housing 1, and the grounding wire is a metal wire with good conductivity, which is used to introduce the static charge on the housing 1 into the earth. The other end of the grounding wire is connected to a grounding device on the ground, such as a grounding grid, a grounding electrode, etc., so as to safely release the static charge to the earth.

[0035] In a feasible embodiment of the present invention, the vibrating screen 5 is connected to the driving member 6 via a crankshaft. Driven by the driving member 6, the vibrating screen 5 is kept vibrating horizontally with a wide width (0.6-2 cm) on the surface of the magnetic drum 4 .

[0036] Specifically, the amplitude of the vibrating screen 5 is 0.6cm-2cm; the amplitude is the maximum displacement generated by the vibrating screen 5 when working, which determines the vibration intensity and impact strength of the material on the screen surface. If the amplitude is too small, the material may not be fully dispersed and layered, affecting the screening effect; if the amplitude is too large, it may cause excessive jumping of the material, even damage the screen or cause material splashing. Therefore, choosing a suitable amplitude range is crucial to achieving an efficient and stable screening process.

[0037] The gap between the vibrating screen 5 and the magnetic drum 4 is 1±0.1mm. The size of this gap is of great significance for ensuring the normal working distance between the two and preventing collision and wear. If the gap is too small, the two may contact each other due to slight deformation of the surface of the magnetic drum or the inner curved surface of the vibrating screen 5, thereby causing friction and wear; if the gap is too large, the magnetic separation effect may be reduced, because some magnetic materials may not be able to contact the screen bars, and the magnetic agglomeration phenomenon cannot be overcome, so that they cannot be effectively adsorbed by the magnetic drum 4. Therefore, by accurately controlling the size of this gap, it can be ensured that the vibrating screen 5 and the magnetic drum 4 operate efficiently and stably in their respective working areas.

[0038] In a feasible embodiment of the present invention, the driving member 6 includes a six-stage excitation motor, and the vibration frequency of the excitation motor is 1000 times / minute. The relatively high frequency can ensure that the vibrating screen has sufficient vibration intensity and sorting efficiency during operation. Driven by the power of the excitation motor, the vibrating screen 5 is kept to perform high-frequency (1000 times / minute) horizontal wide (0.6-2cm) movement on the surface of the magnetic drum 4.

[0039] In a feasible embodiment of the present invention, a connecting member 8 is further included, one end of the connecting member 8 is connected to the housing 1 by a hook, and the other end of the connecting member 8 is fixedly connected to the top of the vibrating screen 5 by a screw, allowing the vibrating screen 5 to reciprocate along a predetermined trajectory when driven by the excitation motor, while maintaining a stable relative position with the housing 1. The connecting member 8 plays a key bridge role in the overall structure, not only ensuring that the vibrating screen 5 can be firmly mounted on the housing 1, but also allowing it to slide within a certain range to adapt to different working conditions and vibration requirements.

[0040] Specifically, the connecting member 8 can adopt a basket wire rope locker, and through manual adjustment, the inner curved surface of the vibrating screen and the surface of the magnetic drum can be kept in the best fit state.

[0041] In a feasible embodiment of the present invention, a plurality of gap adjusting balls 7 are evenly distributed on the inner side of the vibrating screen 5. Since the vibrating screen 5 generates vibration and certain displacement during operation, if there is no appropriate adjustment mechanism, the gap may change, thereby affecting the sorting effect. The gap adjusting balls 7 can automatically adjust and maintain the gap within a predetermined range through their rolling characteristics, thereby ensuring the stable operation of the equipment.

[0042] In a feasible embodiment of the present invention, a permanent magnet 9 is further included to generate a magnetic field for the magnetic drum 4, and the vibrating screen 5 covers half of the surface area of ​​the magnetic drum 4, and the vibrating screen 5 is arranged corresponding to the permanent magnet 9. By arranging the vibrating screen 5 and the permanent magnet 9 in correspondence, it can be ensured that while the vibrating screen 5 stirs the material, the magnetic field of the permanent magnet 9 can fully act on the magnetic particles in the material, making it easier to capture and separate. When the magnetic drum 4 continues to rotate, the magnetic material adsorbed on the magnetic drum 4 is away from the magnetic field of the permanent magnet 9 and will fall down, thereby realizing the collection of the product.

[0043] In a feasible embodiment of the present invention, it also includes a separator plate 10, a product hopper 11 and a tail hopper 12. The separator plate 10 is arranged on the bottom side of the vibrating screen 5; the product hopper 11 is arranged on the side of the separator plate 10 away from the vibrating screen 5 for receiving products; the tail hopper 12 is arranged on the side of the separator plate 10 close to the vibrating screen 5 for receiving waste. The separator plate 10 serves as a key component for material separation. After the material is stirred by the vibrating screen 5 and magnetically separated by the magnetic drum 4, it will fall onto the separator plate 10 along a certain trajectory. The separator plate 10 is scientifically arranged according to the separation law of magnetic particles and non-magnetic particles in the material to guide the material to different collection areas.

[0044] The product hopper 11 is located on the side of the material distribution plate 10 away from the vibrating screen 5, and is specifically used to receive products that meet the requirements after magnetic separation. These products are usually materials with strong magnetism and qualified quality.

[0045] The tail hopper 12 is arranged on the side of the material separation plate 10 close to the vibrating screen 5, and is used to receive materials that do not meet the requirements or are regarded as waste. These waste materials may include non-magnetic materials and weakly magnetic materials. The design of the tail hopper ensures that the waste can be separated quickly and effectively, avoiding pollution of the product and waste of resources.

[0046] The dry magnetic separator provided by the present invention uses grounding drainage to reduce static charge as a supplement, and high-frequency wide-band mechanical vibration as the main method to destroy the electrostatic adsorption force and the micro-magnetic force that produces particle agglomeration. The material falls into the vibrating screen 5 and is pushed and stirred horizontally by the dense vertical screen bars at a high frequency. During the 1-1.5 second movement process on the surface of the magnetic drum 4, about 20-30 horizontal reciprocating movements occur, and the whole is in a boiling state, which completely eliminates the aggregation and agglomeration phenomenon of fine powder. The magnetic particles are constantly moving toward the surface of the magnetic drum 4 under the attraction of the magnetic force inside the magnetic drum 4 during the up and down rolling, squeezing out the non-magnetic or weak magnetic particles, forming more and more magnetic particles on the surface of the magnetic drum. As the magnetic drum 4 rotates, the adsorbed magnetic particles rotate to the side without the magnetic field area, and then they fall under the action of gravity, and finally fall into the product bucket 11 in the unloading area. The non-magnetic and weak magnetic particles are forced to move outward and fall into the tail hopper 12 under the action of gravity and centrifugal force, thereby successfully achieving the purpose of efficient magnetic separation.

[0047] In addition, the whole machine realized by the present invention has a low manufacturing cost, and can be modified on the existing ordinary dry magnetic separator to obtain a good magnetic separation effect. In the first stage of magnetic separation, magnetic minerals can be enriched 3-6 times, and the recovery rate is greater than 98%, which makes the dry magnetic separation technology have a qualitative leap. All indicators (energy consumption, processing capacity, agglomeration coefficient, recovery rate, whole machine size, lightweight, cost) greatly surpass the best spiral dry magnetic separator on the market, and it is in a leading position in the field of dry magnetic separation of fine powder dry materials in China.

[0048] The processing capacity of a single machine can be adjusted and customized according to market needs. Its advantages are particularly obvious in large-scale dry magnetic separation production of fine powder (>500 tons / hour).

[0049] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry magnetic separator, characterized in that: include: The casing (1) has a feed inlet (2) at the top; A vibrating feed trough (3) is arranged inside the housing (1), and the top of the vibrating feed trough (3) is arranged corresponding to the feed port (2); A magnetic drum (4) is rotatably disposed inside the housing (1), the magnetic drum (4) having a partial magnetic field inside, and the magnetic field region always maintains a constant position relative to the housing; A vibrating screen (5) is mounted on the housing (1) at the top, and the vibrating screen (5) is located on the outer periphery of the magnetic drum (4) on the side having the magnetic field, and the top side of the vibrating screen (5) is arranged corresponding to the bottom side of the vibrating feed trough (3); A driving member (6) connected to the vibrating screen (5), and the driving member (6) is used to drive the vibrating screen (5) to reciprocate along the axial direction of the magnetic drum (4); A plurality of gap-adjusting balls (7) are mounted on a side of the vibrating screen (5) facing the magnetic roller (4), and the gap-adjusting balls (7) are in rolling contact with the magnetic roller (4) so ​​that a gap is maintained between the inner curved surface of the vibrating screen (5) and the magnetic roller (4).

2. The dry magnetic separator according to claim 1, characterized in that: It also includes an electrostatic grounding device for introducing the static charge in the fine powder adsorbed on the surface of the magnetic roller (4) into the ground.

3. The dry magnetic separator according to claim 2, characterized in that: The electrostatic grounding device comprises: a carbon brush, one side of which is connected to the magnetic roller (4) and the other side of which is connected to the housing (1); A grounding wire is connected to the casing by welding.

4. The dry magnetic separator according to claim 1, characterized in that: The vibrating screen (5) is connected to the driving member (6) via a crankshaft.

5. The dry magnetic separator according to claim 1, characterized in that: It also comprises a connecting piece (8), one end of which is connected to the casing (1), and the other end of which is fixedly connected to the top of the vibrating screen (5) by means of screws.

6. The dry magnetic separator according to claim 1, characterized in that: The amplitude of the vibrating screen (5) is 0.6 cm-2 cm; and the gap between the vibrating screen (5) and the magnetic roller (4) is 1±0.1 mm.

7. The dry magnetic separator according to claim 1, characterized in that: The driving member (6) comprises a vibration motor, and the vibration frequency of the vibration motor is 1000 times / minute.

8. The dry magnetic separator according to claim 1, characterized in that: The plurality of gap-adjusting balls (7) are evenly distributed on the inner side of the vibrating screen (5).

9. The dry magnetic separator according to claim 1, characterized in that: It also includes a permanent magnet (9) for generating a magnetic field for the magnetic roller (4); the vibrating screen (5) covers half of the surface area of ​​the magnetic roller (4); and the vibrating screen (5) and the permanent magnet (9) are arranged correspondingly.

10. The dry magnetic separator according to claim 9, characterized in that: Also includes: A material dividing plate (10) arranged on the bottom side of the vibrating screen (5); A product hopper (11) is arranged on a side of the distribution plate (10) away from the vibrating screen (5) and is used to receive products; A tail hopper (12) is arranged on a side of the distribution plate (10) close to the vibrating screen (5) and is used to receive waste materials.

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