CN216173205U - Dry-type preselection machine - Google Patents

Abstract

The utility model provides a dry preselection machine, comprising: a back-blowing air path and an eccentric magnetic roller mechanism; the eccentric magnetic roller mechanism is partially arranged in the back blowing air passage and is used for conveying materials and providing an eccentric rotating magnetic field; a feeding area is arranged above the eccentric magnetic roller mechanism; and a tailing area, a middle mining area and a concentrate mining area are arranged below the eccentric magnetic rolling mechanism. According to the utility model, materials in a feeding area are conveyed into a back-blowing air path and perform rolling motion, so that strong-magnetic materials are distributed in the innermost layer, weak-magnetic materials are distributed in the middle layer, non-magnetic materials are distributed in the outermost layer, and under the back-blowing action in the back-blowing air path, non-magnetic fine powder materials in the outer layer leave the surface of an eccentric magnetic roller mechanism and are carried away by air or fall into a tailing area; the weakly magnetic minerals fall into the middling zone along with the rotation of the magnetic drum and the reduction of the magnetic field, and the concentrate falls into the concentrate zone along with the rotation of the magnetic drum and the reduction of the magnetic field, so that the superfine crushed materials are classified, efficiently and finely sorted.

Description

Dry-type preselection machine

Technical Field

The utility model relates to the technical field of magnetic separation, in particular to a dry-type preselector.

Background

Along with the continuous and rapid development of economy in China, the demand of raw materials is continuously high, iron ore is used as one of main raw materials in the steel industry, and the mineral separation process is continuously innovated and updated through processes and equipment for many years, so that the mineral separation process is greatly improved. For example, in recent years, ultrafine crushing and crushing equipment such as a high-pressure roller mill, a vertical mill, a novel hammer crusher and the like is applied to an iron ore dressing process on a large scale, and the production cost of enterprises is greatly reduced.

However, most of the innovations of iron ore processing equipment are crushing and grinding equipment, and the magnetic separation equipment in the iron ore processing flow generally adopts traditional magnetic separation equipment, so that the separation effect is poor. Especially, when the traditional dry magnetic separation equipment faces materials crushed by the novel superfine crushing equipment, the separation effect is poor because the separated materials are thinner and the phenomena of magnetic shielding and magnetic impurities are more serious.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model provides a dry type preselector, and aims to solve the problem that the conventional dry type magnetic separation equipment is poor in separation effect due to serious magnetic shielding and magnetic impurity clamping phenomena.

The utility model provides a dry preselection machine, which comprises: a back-blowing air path and an eccentric magnetic roller mechanism; the eccentric magnetic roller mechanism is partially arranged in the back blowing air path, the back blowing air path is used for blowing back blowing air opposite to the material conveying direction to the surface of the eccentric magnetic roller mechanism, and the eccentric magnetic roller mechanism is used for conveying materials and also used for providing an eccentric rotating magnetic field; a feeding area is arranged above the eccentric magnetic roller mechanism; a tailing area, a middling area and a concentrate area are arranged below the eccentric magnetic rolling mechanism; under the conveying action of the eccentric magnetic rolling mechanism, materials in the feeding area are conveyed to the back-blowing air path and roll, so that the materials are layered on the surface of the eccentric magnetic rolling mechanism, strong magnetic materials are distributed on the innermost layer, weak magnetic materials are distributed on the middle layer, non-magnetic materials are distributed on the outermost layer, the outermost non-magnetic materials are separated from the surface of the eccentric magnetic rolling mechanism under the back-blowing action of the back-blowing air path and enter a tailing area or are blown out along with air, and the weak magnetic materials and the strong magnetic materials enter the middling area and a concentrate area under the magnetic field and the conveying action of the eccentric magnetic rolling mechanism in sequence.

Further, in the dry type preselection machine, the eccentric magnetic roller mechanism includes: a magnetic drum and an eccentric magnetic system; the magnetic roller is connected with a roller driving part and used for driving the magnetic roller to rotate so as to convey materials on the surface of the magnetic roller and convey the materials into the back blowing air path; the eccentric magnetic system is eccentrically arranged in the magnetic roller, a strong magnetic area and a weak magnetic area are formed on the surface of the magnetic roller, and the strong magnetic area is arranged at the separation area of the back blowing air path so that materials can be rolled and non-magnetic materials can be separated under the action of a magnetic field and wind force; the eccentric magnetic system is rotatably arranged in the magnetic roller so as to enable the materials on the surface of the magnetic roller to carry out rolling motion under the action of a rotating magnetic field.

Further, in the dry preselection machine, the eccentric magnetic system is connected with a magnetic system driving member for driving the eccentric magnetic system to rotate.

Further, in the dry preselector, the magnetic drum has a non-metal cylinder structure; and/or the back blowing air path is a non-metal air path; and/or the feeding area is a non-metal feeding area.

Further, in the dry type preselector, the reverse blowing air path includes: the air inlet and discharge area is arranged at the lower side of the eccentric magnetic roller mechanism; the air outlet discharging area is arranged on the upper side of the eccentric magnetic roller mechanism; and the separation area is arranged between the air inlet discharge area and the air outlet discharge area.

Further, in the dry pre-selector, the strong magnetic area of the eccentric magnetic roller mechanism is arranged at the sorting area of the reverse blowing air path, so that the materials are rolled and sorted under the action of a magnetic field and wind force.

Further, in the dry preselector, a material distributing plate is arranged on one side of the back-blowing air path below the eccentric magnetic roller mechanism, and a plurality of blanking areas are formed on one side of an air inlet of the back-blowing air path in an isolated manner and used for isolating different magnetic materials; the material distribution plate is arranged below the eccentric magnetic roller mechanism in a position adjustable along the horizontal direction, and is of a telescopic plate structure and used for adjusting the vertical height and the material distribution position.

Further, in the dry preselector, the side wall of the material distributing plate, the inner wall of the back-blowing air path and/or the outer wall of the eccentric magnetic roller mechanism are/is provided with wear-resistant pieces.

Further, in the dry preselection machine, a feeding slide carriage is arranged at the feeding area and used for buffering materials input from the feeding area.

Furthermore, in the dry preselector, the outside of the back-blowing air path is provided with a cleaning brush and/or a cleaning scraper which are positioned at the periphery of the eccentric magnetic roller mechanism and are used for cleaning materials attached to the surface of the eccentric magnetic roller mechanism.

According to the dry-type preselector provided by the utility model, under the conveying action of the eccentric magnetic rolling mechanism, materials in a feeding area are conveyed into the back blowing air path and perform rolling motion, so that the materials are layered on the surface of the eccentric magnetic rolling mechanism, strong magnetic materials are distributed on the innermost layer, weak magnetic materials are distributed on the middle layer, non-magnetic materials are distributed on the outermost layer, non-magnetic fine powdery materials on the outermost layer are difficult to separate from a material layer in time due to small particles and small centrifugal force, the non-magnetic fine powdery materials on the outer layer can be brought up along with back blowing under the back blowing action in the back blowing air path, and most of the fine powdery non-magnetic materials can leave the surface of the eccentric magnetic rolling mechanism under the action of the wind and are fully distributed in the space of the back blowing air path, and the fine powdery non-magnetic materials in the back blowing air path are either taken away by the wind or fall into a tailing area; most non-magnetic granular materials are brought to a tailing area along with the rotation of the magnetic drum and the reduction of the magnetic field, weakly magnetic minerals fall to a middling area along with the rotation of the magnetic drum and the reduction of the magnetic field, and concentrate falls to a concentrate area along with the rotation of the magnetic drum and the reduction of the magnetic field, so that the super-fine crushed materials are classified in a grading manner, efficiently and finely.

The dry type preselector provides a complex separation environment with coupling of multiple physical fields for dry type magnetic separation of ultrafine materials, wherein the materials are mainly subjected to the multi-force composite action of gravity, centrifugal force, magnetic overturning force, wind power, magnetic field suction force and the like, so that the purpose of classification, high efficiency and fine separation is achieved, the problem that the separation indexes of the traditional dry separators for ultrafine materials such as materials below a high-pressure roller mill screen, materials above a vertical mill screen, materials below a hammer crusher screen and the like cannot reach the standard is solved, and the effects of increasing waste throwing rate, improving metal grade and reducing production cost can be achieved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a dry pre-selector according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a dry pre-selector according to an embodiment of the present invention;

fig. 3 is a front view of a reverse blowing air path according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a side view of an eccentric magnetic roller mechanism provided by an embodiment of the present invention;

FIG. 6 is a front view of an eccentric magnetic roller mechanism provided by an embodiment of the present invention;

FIG. 7 is a cross-sectional view taken at B-B of FIG. 6;

fig. 8 is a side view of a material distribution plate according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 2, schematic structural diagrams of a dry pre-selector provided by an embodiment of the utility model are shown. As shown, the dry pre-selector includes: a back-blowing air path 1, an eccentric magnetic roller mechanism 2 and a frame body 3; wherein the content of the first and second substances,

with continued reference to fig. 1, the frame body 3 plays a supporting role to support the eccentric magnetic roller mechanism 2, the reverse blowing air path 1, and the like.

With continued reference to fig. 1 and fig. 2, the eccentric magnetic roller mechanism 2 is partially disposed in the back-blowing air path 1, and the back-blowing air path 1 is used for blowing back-blowing air opposite to the material conveying direction to the surface of the eccentric magnetic roller mechanism 2; the eccentric magnetic roller mechanism 2 is used for conveying materials and providing an eccentric rotating magnetic field. Specifically, the reverse blowing air path 1 may be vertically arranged to provide a reverse blowing air blowing vertically upward. The eccentric magnetic roller mechanism 2 can be partially arranged in the back-blowing air path 1, and the eccentric magnetic roller mechanism 2 and the back-blowing air path 1 form a sorting area for sorting materials so as to realize the separation of the materials; the eccentric magnetic rolling mechanism 2 can enable materials to be conveyed along the surface of the eccentric magnetic rolling mechanism 2, the materials are conveyed into the back blowing air path 1, the eccentric magnetic rolling mechanism 2 can also provide an eccentric rotating magnetic field, the materials can be rolled and can be adsorbed on the surface of the eccentric magnetic rolling mechanism 2 to be conveyed along the rotating rolling surface of the eccentric magnetic rolling mechanism 2, and the magnetic materials are prevented from falling vertically under the action of gravity. In this embodiment, the eccentric magnetic roller mechanism 2 can transport the material, and can provide a rotating magnetic field with different surface strengths to form a weak magnetic area and a strong magnetic area, so that the material can be turned over at high speed at the strong magnetic area of the eccentric magnetic roller mechanism 2 in the blowback air path 1 to realize layering, and the material can be adsorbed under the action of the magnetic field, and different magnetic materials can fall down respectively under the action of the change of the magnetic field strength, i.e. the material can be sorted. The blowing direction provided by the back blowing air path 1 is opposite to the conveying direction of the materials, namely the blowing direction is from bottom to top, and the materials are conveyed downwards under the conveying action of gravity and the eccentric magnetic roller mechanism 2, of course, the blowing direction provided by the back blowing air path 1 can also be an inclined direction, and only a component which is vertically upward, namely opposite to the conveying direction of the materials is required to be provided; in order to avoid heat generation in the use process of the back-blowing air path 1, the back-blowing air path 1 may be a non-metal air path, that is, the outer plate surrounding the back-blowing air path 1 may be non-metal materials such as glass fiber reinforced plastic, polyvinyl chloride, and polyvinyl chloride, so as to avoid eddy current generated by the materials, and further avoid heat generation of the back-blowing air path 1; in order to prolong the service life of the reverse blowing air path 1, preferably, the inner wall of the reverse blowing air path 1 may be provided with a wear-resistant sheet, especially at a position contacting with the material, the wear-resistant sheet may be a wear-resistant ceramic sheet, or may be another wear-resistant sheet, which is not limited in this embodiment.

With continued reference to fig. 1 and 2, a feeding area 31 is disposed above the eccentric magnetic roller mechanism 2, and the feeding area 31 may be supported by the frame body 3 for receiving the material, so that the material is conveyed from the feeding area 31 to the surface of the eccentric magnetic roller mechanism 2 under the action of gravity. Specifically, the feeding region 31 may be disposed at one side (the right side as shown in fig. 1) of the air outlet of the back-blowing air duct 1, so that the material falls onto the surface of the eccentric magnetic roller mechanism 2 through the feeding region 31 under the action of gravity and is conveyed into the back-blowing air duct 1 under the rolling action of the eccentric magnetic roller mechanism 2, and the feeding region 31 and the back-blowing air duct 1 may share the intermediate partition plate. In the present embodiment, a feeding port (an upper end as shown in fig. 1) of the feeding zone 31 may be connected to an external feeding machine, so as to realize the input of the material; in order to buffer the input of the material, preferably, a feeding slide carriage 311 is arranged at the feeding area 31 and is used for buffering the material input from the feeding area 31; the feeding slide carriage 311 can be obliquely arranged on the inner wall of the feeding area 31 so as to guide and buffer the materials, and the materials fall into the surface of the eccentric magnetic roller mechanism 2 after being buffered; preferably, the feeding chute 311 is rotatably connected to the inner wall of the feeding zone 31 to adjust its buffer angle. In order to avoid heat generation in the use process of the feeding area 31, preferably, the feeding area 31 can be a non-metal feeding area, that is, the outer plate surrounding the feeding area 31 can be made of non-metal materials such as glass fiber reinforced plastics, polyvinyl chloride propylene and the like, so as to avoid eddy current generated by the materials and further avoid heat generation of the feeding area 31; in order to prolong the service life of the feeding area 31, preferably, the inner wall of the feeding area 31 may be provided with a wear-resistant sheet, especially at a position contacting with the material, the wear-resistant sheet may be a wear-resistant ceramic sheet, or may be another wear-resistant sheet, which is not limited in this embodiment.

With continued reference to fig. 1 and 2, a tailing area 32, a middling area 33 and a concentrate area 34 are arranged below the eccentric magnetic rolling mechanism 2, and the three can be supported by the frame body 3, so that nonmagnetic materials in the materials are output from the tailing area 32 as tailings, weakly magnetic materials are output from the middling area 33 as middling, and strongly magnetic materials are output from the concentrate area 34 as concentrate; meanwhile, the tailing area 32 is also arranged below the back-blowing air path 1, so that the tailings falling in the back-blowing air path 1 also fall into the tailing area 32, and collection is realized. Specifically, the tailing area 32, the middling area 33 and the concentrate area 34 can be sequentially arranged from left to right, the arrangement position of the tailing area 32 is matched with the position of the back blowing air path 1, and the tailing area can be arranged right below the back blowing air path 1 so as to receive nonmagnetic materials blown out by back blowing of the back blowing air path 1; the arrangement positions of the middling area 33 and the concentrate area 34 are matched with the magnetic field intensity distribution of the eccentric magnetic rolling mechanism 2, namely, the magnetic field intensity above the middling area 33 and the concentrate area 34 can be reduced in sequence, so that weak magnetic materials and strong magnetic materials can fall into the middling area 33 and the concentrate area 34 in sequence.

With reference to fig. 2, under the conveying action of the eccentric magnetic roller mechanism 2, the material in the feeding area 31 is conveyed into the back-blowing air passage 1 and is subjected to rolling motion; when the materials roll, the materials can be automatically layered on the surface of the eccentric magnetic rolling mechanism 2, so that the strong magnetic materials are arranged on the innermost layer, the weak magnetic materials are arranged on the middle layer, and the non-magnetic materials are arranged on the outermost layer; the non-magnetic fine powdery material at the outermost layer is small in particle and small in centrifugal force and is difficult to separate from the material layer in time, so under the action of reverse high-speed wind, namely reverse blowing wind in a reverse blowing wind path 1, part of the non-magnetic fine powdery material at the outermost layer can be brought up to move upwards along with the high-speed wind, most of the fine powdery non-magnetic material can leave the surface of the eccentric magnetic roller mechanism 2 under the action of the wind and is fully distributed in the space of the wind path, and part of the fine powdery non-magnetic material in the wind path is taken away by the wind and falls into a tailing area 32; most of non-magnetic granular materials are brought to a tailing area 32 along with the rotation of the eccentric magnetic roller mechanism 2 and the reduction of a magnetic field, weak magnetic materials, namely weak magnetic minerals, fall to a middling area 33 along with the rotation of the eccentric magnetic roller mechanism 2 and the reduction of the magnetic field, strong magnetic materials, namely concentrate, fall to a concentrate area 34 along with the rotation of the eccentric magnetic roller mechanism 2 and the reduction of the magnetic field, and therefore the super-fine crushed materials are classified in a grading type, high efficiency and fine mode. As shown in fig. 2, the triangular marks in the material represent non-magnetic materials, the circular marks represent medium-magnetic materials, i.e., weak-magnetic materials, and the square marks represent magnetic materials, i.e., strong-magnetic materials.

With continued reference to fig. 1 and 2, a cleaning brush 4 and/or a cleaning scraper 5 located at the periphery of the eccentric magnetic roller mechanism 2 is/are arranged outside the reverse blowing air path 1, and is used for cleaning materials attached to the surface of the eccentric magnetic roller mechanism 2. Specifically, the cleaning brush 4 and/or the cleaning scraper 5 can be supported on the frame body 3 through a support frame, and the cleaning brush 4 and the cleaning scraper 5 can be arranged in the weak magnetic field area of the eccentric magnetic roller mechanism 2, so that the materials attached to the surface of the eccentric magnetic roller mechanism 2 can be cleaned after the materials are sorted; in this embodiment, when the eccentric magnetic roller mechanism 2 conveys materials counterclockwise, the cleaning brush 4 and the cleaning scraper 5 are arranged in the weak magnetic area on the right side, and the cleaning scraper 5 is arranged below the cleaning brush 4, so that the materials are scraped first and then cleaned, and the cleaning effect of the materials is ensured. In order to adjust the cleaning gap, it is preferable that the gap between the cleaning brush 4 and the cleaning blade 5 and the eccentric magnetic roller mechanism 2 is adjustable, for example, the cleaning brush 4 and the cleaning blade 5 may be connected to a support frame via a telescopic plate to clean a small amount of materials attached to the surface of the eccentric magnetic roller mechanism 2. In this embodiment, the cleaning brush 4 may be made of nylon, and the cleaning scraper 5 may be made of rubber.

In this embodiment, as shown in fig. 1 and fig. 2, to realize the output and input of the material from the back-blowing air path 1, preferably, a material passing gap 6 is provided between the eccentric magnetic roller mechanism 2 and the back-blowing air path 1, so that the material is conveyed into the back-blowing air path 1 or out of the back-blowing air path 1 along the surface of the eccentric magnetic roller mechanism 2, so that the material in the material feeding region 31 is conveyed into the back-blowing air path 1, and performs rolling motion, and a part of the non-magnetic material, the weak-magnetic material and the strong-magnetic material leave the back-blowing air path 1 under the magnetic field and conveying action of the eccentric magnetic roller mechanism 2, and under the magnetic field and conveying action of the eccentric magnetic roller mechanism 2 and the gravity action, the non-magnetic material, the weak-magnetic material and the strong-magnetic material sequentially enter the tailing region 32, the middling region 33 and the concentrate region 34.

In this embodiment, as shown in fig. 1 and fig. 2, a material separating plate 7 is disposed below the eccentric magnetic roller mechanism 2 on one side (right side as shown in fig. 1) of the reverse blowing air path 1, and a plurality of material discharging areas are formed on one side of an air inlet (lower end as shown in fig. 1) of the reverse blowing air path 1 for separating different magnetic materials. Specifically, the material distributing plate 7 may be disposed on the frame body 3 so as to divide the area below the eccentric magnetic roller mechanism 2 on the right side of the reverse blowing air path 1; in this embodiment, the material distributing plates 7 are arranged side by side and at intervals so as to isolate three blanking areas, the three blanking areas respectively correspond to the tailing area 32, the middling area 33 and the concentrate area 34, so as to respectively convey the isolated materials with different magnetism to the tailing area 32, the middling area 33 and the concentrate area 34, and the material distributing plates 7 are used for isolating the materials with different magnetism; of course, the number of the material separating plates 7 may be other, such as one or more. To facilitate adjustment of the material distributing position, the material distributing plate 7 is preferably arranged on the frame body 3 below the eccentric magnetic roller mechanism 2 in a position adjustable along the horizontal direction (relative to the position shown in fig. 1) to adjust the isolation position in the horizontal direction; of course, the material distributing plate 7 can also be of a telescopic plate structure and used for adjusting the vertical height and adjusting the size of a gap between the material distributing plate 7 and the eccentric magnetic roller mechanism 2. In order to prolong the service life of the material distributing plate 7, preferably, the side wall of the material distributing plate 7 may be provided with a wear-resistant sheet, especially a position contacting with the material, the wear-resistant sheet may be a wear-resistant ceramic sheet, or may be another wear-resistant sheet, which is not limited in this embodiment.

With continued reference to fig. 2 to 4, the reverse blowing air path 1 includes: an air inlet discharge area 11, an air outlet discharge area 12 and a sorting area 13; wherein, the air inlet and discharge area 11 is arranged at the lower side of the eccentric magnetic roller mechanism 2; the air outlet discharging area 12 is arranged on the upper side of the eccentric magnetic roller mechanism 2; the sorting area 13 is arranged between the air inlet discharging area 11 and the air outlet discharging area 12. Specifically, as shown in fig. 4, an air inlet discharging area 11, a sorting area 13 and an air outlet discharging area 12 are arranged from bottom to top in sequence; the air inlet and discharge area 11 can be connected with a blower to blow back air flowing from bottom to top into the air inlet and discharge area 11, and the back air can be high-speed air to ensure the effect of blowing nonmagnetic materials; wherein the eccentric magnetic roller mechanism 2 is partially arranged in the sorting area 13 so as to sort the materials at the sorting area 13, so that the magnetic materials and the non-magnetic materials are separated. In order to ensure that the wind flows from bottom to top, preferably, the air outlet discharging area 12 can be connected with an exhaust fan, high-speed wind enters the sorting area 13 from the air inlet discharging area 11, and part of materials, especially non-magnetic materials, are brought to the air outlet discharging area 12 by the wind to be discharged out of the dry-type pre-selector; in order to prevent air pollution caused by material-carrying gas discharged from the air inlet discharge area 11, the air outlet discharge area 12 may be connected with a dust collector, so that air with material is filtered by the dust collector and then discharged into the atmosphere, and the material is collected by the dust collector.

With continued reference to fig. 2, 5-7, the eccentric magnetic roller mechanism 2 includes: a magnetic drum 21 and an eccentric magnetic system 22; the magnetic roller 21 is connected with a roller driving part 23 for driving the magnetic roller 21 to rotate so as to convey the material on the surface of the magnetic roller 21, so that the material is conveyed into the back blowing air path 1; the eccentric magnetic system 22 is eccentrically arranged inside the magnetic roller 21, a strong magnetic area and a weak magnetic area are formed on the surface of the magnetic roller 21, and the strong magnetic area is arranged at the separation area 13 of the back blowing air path 1 so that materials can be tumbled and non-magnetic materials can be separated under the action of a magnetic field and wind force; the eccentric magnetic system 22 is rotatably disposed in the magnetic drum 21 so that the material on the surface of the magnetic drum 21 is tumbled by the rotating magnetic field.

Specifically, the magnetic roller 21 may be a cylindrical structure, and in order to prevent the magnetic roller 21 from generating heat during use, the magnetic roller 21 may be a non-metallic cylinder made of non-metallic materials such as glass fiber reinforced plastics, polyvinyl chloride, and polyvinyl chloride propylene, so as to prevent the materials from generating eddy currents, and further prevent the magnetic roller 21 from generating heat; in order to prolong the service life of the magnetic drum 211, preferably, the outer wall of the magnetic drum 21 may be provided with a wear-resistant sheet, especially at a position contacting with the material, and the wear-resistant sheet may be a wear-resistant ceramic sheet, or may be another wear-resistant sheet, which is not limited in this embodiment. The magnetic roller 21 can be connected with a roller driving part 23 for driving the magnetic roller 21 to rotate so as to convey the material on the surface of the magnetic roller 21, and further convey the material into the back blowing air path 1; in this embodiment, as shown in fig. 2, the magnetic roller 21 rotates counterclockwise, so that the air is conveyed into the reverse blowing air duct 1 on the left side of the magnetic roller 21 counterclockwise along the upper outer wall; of course, if the back-blowing air passage 1 is located on the right side of the magnetic roller 21, the magnetic roller 21 can rotate clockwise, so that the materials fall down clockwise to be conveyed into the back-blowing air passage on the right side for sorting; the cylinder driving part 23 can be a cylinder speed reducing motor, and the cylinder driving part 23 can be connected with the magnetic cylinder 21 through a chain wheel transmission mechanism 25; the rotating speed range of the cylinder driving part 23 is adjustable within 0-200 r/min.

With continued reference to fig. 2, 5 to 7, the eccentric magnetic system 22 and the magnetic drum 21 are eccentrically disposed, that is, they are not coaxially disposed, so that the outer surface of the magnetic drum 21 can form a strong magnetic region and a weak magnetic region; in order to ensure that the magnetic field is arranged in an up-and-down symmetrical manner, the axes of the eccentric magnetic system 22 and the magnetic roller 21 can be on the same horizontal line, so that the eccentric magnetic system and the magnetic roller 21 can be conveyed along with the magnetic roller 21 at the upper part, and the weak magnetic material and the strong magnetic material sequentially fall down along with the weakening of the magnetic field at the lower part in the process of anticlockwise rotation of the materials; the strong magnetic area can be arranged at the sorting area 13 of the back blowing air path 1, so that materials are sorted under the action of a magnetic field and wind force, the materials are layered, and the separation between nonmagnetic materials and magnetic materials can be realized; in this embodiment, the position where the gap between the eccentric magnetic system 22 and the magnetic roller 21 is small is a strong magnetic region, as shown in fig. 2, the gap between the eccentric magnetic system 22 and the left end of the magnetic roller 21 is small, so that the left end of the eccentric magnetic system 22 and the position adjacent thereto are strong magnetic regions, and the other positions may be weak magnetic regions; in this embodiment, the eccentric amounts of the two can be determined according to actual conditions, and this embodiment is not limited in any way. The eccentric magnetic system 22 is rotatably arranged in the magnetic roller 21 so as to provide a rotating magnetic field, so that the materials can be turned over, and particularly, the materials can be turned over at a high speed in a strong magnetic area, so that different materials can be layered; in this embodiment, the rotation directions of the eccentric magnetic system 22 and the magnetic drum 21 are opposite, and the eccentric magnetic system 22 can rotate clockwise, so that the relative rotation speed between the two is increased, and the material layering effect is improved. To realize the rotation of the eccentric magnetic system 22, preferably, the eccentric magnetic system 22 may be connected with a magnetic system driving member 24 for driving the eccentric magnetic system 22 to rotate reversely, i.e. the rotation direction between the eccentric magnetic system 22 and the magnetic roller 21 is opposite; in this embodiment, the eccentric magnetic system 22 rotates clockwise. Wherein, the eccentric magnetic system 22 can be a 360-degree full magnetic structure with N-S alternate arrangement; the magnetic system driving part 24 can be a 6-pole motor and drives the eccentric magnetic system 22 to rotate at a high speed, and the rotating speed range is 0-1000r/min and is adjustable.

In this embodiment, be equipped with the gap between the bottom in magnetic drum 21 and pan feeding district 31, it can be 2mm to magnetic drum 21 can the free rotation, and then realizes the transport of material, makes the material follow the synchronous anticlockwise rotation of magnetic drum 21.

Referring to fig. 8, a schematic structural diagram of a material distributing plate according to an embodiment of the present invention is shown. As shown, the material-distributing plate 7 includes: a lower fixing plate 71 and an upper adjusting plate 72; wherein, the upper adjusting plate 72 is connected to the top of the upper fixing plate 71 in a height direction position adjustable manner, and a locking member 73 is provided between the lower fixing plate 71 and the upper adjusting plate 72 for locking the lower fixing plate 71 and the upper adjusting plate 72 when the upper adjusting plate 72 is adjusted in place. Specifically, the lower fixing plate 71 may be fixed on the frame body 3 by bolts, and the upper adjusting plate 72 may be vertically disposed at the left side of the lower fixing plate 71 and slidably press-contacted on the left sidewall of the lower fixing plate 71 along the left sidewall of the lower fixing plate 71; the locking member 73 may be a bolt assembly to be inserted through the lower fixing plate 71 and the upper adjusting plate 72 when the upper adjusting plate 72 is adjusted in place, so that the upper adjusting plate 72 is fixed to the lower fixing plate 71 to form a telescopic plate structure.

The working process of the dry-type preselecting machine comprises the following steps: the feeding area 31 receives materials, the materials are buffered by the feeding area 31 through the feeding slide carriage 311 and then fall onto the surface of the magnetic drum 21, the magnetic drum 21 rotates anticlockwise to drive the materials to enter the sorting area 13 through the material passing gap 6, meanwhile, when the materials contact a magnetic field, the materials do high-speed rolling motion under the high-speed rotation action of the eccentric magnetic system 22 of the N-S alternating magnetic field, when the materials roll, the materials are automatically layered on the surface of the magnetic drum 21, the strong magnetic materials are distributed on the innermost layer, the weak magnetic materials are distributed on the middle layer, and the non-magnetic materials are distributed on the outermost layer; the outermost non-magnetic fine powdery material is small in particle and centrifugal force, and is difficult to separate from the material layer in time, however, high-speed air enters the sorting area 13 from the air inlet discharge area 11 of the reverse blowing air path 1, the outer non-magnetic fine powdery material is partially taken up along with the high-speed air, most of the fine powdery non-magnetic material leaves the surface of the magnetic drum 21 under the action of the air, and is fully distributed in the space of the reverse blowing air path 1, and the fine powdery non-magnetic material in the reverse blowing air path 1 is either taken away by the air into the dust collector for collection or falls into the tailing area 32. Most of the non-magnetic granular materials are brought to a tailing area 32 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, weakly magnetic minerals fall to a middling area 33 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, and concentrate falls to a concentrate area 33 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, so that the super-fine crushed materials are classified in a grading type, high efficiency and fine mode.

In summary, in the dry preselector provided in this embodiment, under the conveying action of the eccentric magnetic roller mechanism 2, the material in the feeding region 31 is conveyed into the back-blowing air path 1 and performs rolling motion, so that the material is layered on the surface of the eccentric magnetic roller mechanism 2, so that the ferromagnetic material is arranged in the innermost layer, the weakly magnetic material is arranged in the middle layer, the nonmagnetic material is arranged in the outermost layer, the nonmagnetic fine powder material in the outermost layer is difficult to separate from the material layer in time due to small particles and small centrifugal force, and can be brought up along with the back-blowing air under the back-blowing action in the back-blowing air path 1, and most of the fine powder nonmagnetic material can leave the surface of the eccentric magnetic roller mechanism 2 under the air-blowing action and is fully distributed in the space of the back-blowing air path 1, so that the fine powder nonmagnetic material in the back-blowing air path 1 is brought away by the air, or fall into the tailings area 32; most of the non-magnetic granular materials are brought to a tailing area 32 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, weakly magnetic minerals fall to a middling area 33 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, and concentrate falls to a concentrate area 33 along with the rotation of the magnetic drum 21 and the reduction of the magnetic field, so that the super-fine crushed materials are classified in a grading type, high efficiency and fine mode.

The dry type preselector provides a complex separation environment with coupling of multiple physical fields for dry type magnetic separation of ultrafine materials, wherein the materials are mainly subjected to the multi-force composite action of gravity, centrifugal force, magnetic overturning force, wind power, magnetic field suction force and the like, so that the purpose of classification, high efficiency and fine separation is achieved, the problem that the separation indexes of the traditional dry separators for ultrafine materials such as materials below a high-pressure roller mill screen, materials above a vertical mill screen, materials below a hammer crusher screen and the like cannot reach the standard is solved, and the effects of increasing waste throwing rate, improving metal grade and reducing production cost can be achieved.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A dry preselection machine, comprising: a back-blowing air passage (1) and an eccentric magnetic roller mechanism (2); wherein the content of the first and second substances,

the eccentric magnetic roller mechanism (2) is partially arranged in the back blowing air path (1), the back blowing air path (1) is used for blowing back blowing opposite to the material conveying direction to the surface of the eccentric magnetic roller mechanism (2), and the eccentric magnetic roller mechanism (2) is used for conveying materials and also used for providing an eccentric rotating magnetic field;

a feeding area (31) is arranged above the eccentric magnetic roller mechanism (2);

a tailing area (32), a middling area (33) and a concentrate area (34) are arranged below the eccentric magnetic rolling mechanism (2);

under the conveying action of the eccentric magnetic rolling mechanism (2), materials in the feeding area (31) are conveyed into the back blowing air path (1) and roll, so that the materials are layered on the surface of the eccentric magnetic rolling mechanism (2), strong magnetic materials are distributed on the innermost layer, weak magnetic materials are distributed on the middle layer, non-magnetic materials are distributed on the outermost layer, the outermost non-magnetic materials are separated from the surface of the eccentric magnetic rolling mechanism (2) under the back blowing action of the back blowing air path (1) and enter the tailing area (32) or are blown out with air, and the weak magnetic materials and the strong magnetic materials enter the middling area (33) and the concentrate area (34) under the conveying action of the magnetic field of the eccentric magnetic rolling mechanism (2) in sequence.

2. Dry preselection machine according to claim 1, characterized in that the eccentric magnetic roller mechanism (2) comprises: a magnetic drum (21) and an eccentric magnetic system (22); wherein the content of the first and second substances,

the magnetic roller (21) is connected with a roller driving part (23) for driving the magnetic roller (21) to rotate so as to convey the materials on the surface of the magnetic roller (21) and convey the materials into the back blowing air path (1);

the eccentric magnetic system (22) is eccentrically arranged in the magnetic roller (21), a strong magnetic area and a weak magnetic area are formed on the surface of the magnetic roller (21), and the strong magnetic area is arranged at the sorting area of the back blowing air path (1) so that materials can be tumbled and non-magnetic materials can be sorted under the action of a magnetic field and wind force;

the eccentric magnetic system (22) is rotatably arranged in the magnetic roller (21) so that the materials on the surface of the magnetic roller (21) carry out rolling motion under the action of a rotating magnetic field.

3. A dry pre-selector as set forth in claim 2,

the eccentric magnetic system (22) is connected with a magnetic system driving piece (24) and used for driving the eccentric magnetic system (22) to rotate.

4. A dry pre-selector as set forth in claim 2,

the magnetic roller (21) is of a non-metal cylinder structure; and/or the presence of a gas in the gas,

the back blowing air path (1) is a non-metal air path; and/or the presence of a gas in the gas,

the feeding area (31) is a non-metal feeding area.

5. Dry pre-selector according to any one of claims 1 to 4, characterized in that the reverse blow air path (1) comprises:

the air inlet and discharge area (11) is arranged at the lower side of the eccentric magnetic roller mechanism (2);

the air outlet discharging area (12) is arranged on the upper side of the eccentric magnetic roller mechanism (2);

and the separation area (13) is arranged between the air inlet discharge area (11) and the air outlet discharge area (12).

6. A dry pre-selector as set forth in claim 5,

the strong magnetic area of the eccentric magnetic rolling mechanism (2) is arranged at the sorting area (13) of the back blowing air path (1) so that materials can be rolled and sorted under the action of a magnetic field and wind force.

7. A dry pre-selector as set forth in any one of claims 1 to 4,

a material distributing plate (7) is arranged below the eccentric magnetic roller mechanism (2) and on one side of the back-blowing air path (1), and a plurality of blanking areas are formed on one side of an air inlet of the back-blowing air path (1) in an isolated mode and used for isolating different magnetic materials;

the material distribution plate (7) is arranged below the eccentric magnetic roller mechanism (2) in a position adjustable along the horizontal direction, and the material distribution plate (7) is of a telescopic plate structure and is used for adjusting the vertical height and the material distribution position.

8. A dry pre-selector as set forth in claim 7,

and wear-resistant sheets are arranged on the side wall of the material distribution plate (7), the inner wall of the back blowing air path (1) and/or the outer wall of the eccentric magnetic roller mechanism (2).

9. A dry pre-selector as set forth in any one of claims 1 to 4,

and a feeding slide carriage (311) is arranged at the feeding area (31) and used for buffering materials input from the feeding area (31).

10. A dry pre-selector as set forth in any one of claims 1 to 4,

and a cleaning brush (4) and/or a cleaning scraper (5) which are positioned at the periphery of the eccentric magnetic roller mechanism (2) are arranged outside the back blowing air path (1) and are used for cleaning materials attached to the surface of the eccentric magnetic roller mechanism (2).

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