Upper and lower double drum permanent magnetic dry magnetic separator

Abstract

The present invention provides an upper and lower double-drum permanent magnetic dry-type magnetic separator, which belongs to the technical field of magnetic separation equipment. The upper and lower double-drum permanent magnetic dry-type magnetic separator includes a shell, a first magnetic separation zone, a second magnetic separation zone, an L-shaped port, an upper magnetic separation roller, a material guide zone, a feeding unit, a first conveying channel, a second conveying channel, a lower magnetic separation roller, a first discharge port and a second discharge port; the present invention realizes multiple magnetic separation treatments of materials by distributing the upper magnetic separation roller and the lower magnetic separation roller inside the shell, which not only ensures the effective separation of magnetic materials, but also reduces the interference of non-magnetic materials. At the same time, the present invention adopts a reciprocating shaking design of the feeding hopper and the material guide shell, which enables the material to fall evenly into the magnetic separation area, further improving the efficiency of magnetic separation. In addition, the material can be air-dried during the reciprocating shaking process, effectively avoiding the influence of wet materials on the magnetic separation effect, thereby ensuring the effective separation of magnetic materials and non-magnetic materials.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic separation equipment, in particular to an upper and lower double-drum permanent magnetic dry magnetic separator. Background Art

[0002] In recent years, with the continuous development of mines, high-grade mineral resources have been decreasing and even facing exhaustion. Therefore, people have gradually turned their mining targets to low-grade lean ores. However, the mineral monomer particles in these lean ores are fine and are often mixed with various harmful minerals and impurities. In the ore screening process, this not only reduces the screening efficiency, but also causes serious wear on the ball mill, thereby shortening its service life. For this reason, before the ore enters the ball mill, a permanent magnetic dry magnetic separator is needed for pre-grinding pre-selection to remove the tailings in the ore.

[0003] However, the traditional permanent magnetic dry magnetic separator adopts a single magnetic roller design, with relatively low magnetic field strength and small magnetic field gradient. It is difficult to effectively select some weakly magnetic minerals (such as hematite, siderite, etc.). This not only increases the amount of tailings, but also leads to waste of resources, making it impossible to fully utilize the already scarce mineral resources. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an upper and lower double-drum permanent magnetic dry magnetic separator that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: an upper and lower double-drum permanent magnetic dry magnetic separator, comprising a shell, a first magnetic separation zone and a second magnetic separation zone are arranged inside the shell, an L-shaped port connected to the first magnetic separation zone is opened on the shell, an upper magnetic separation roller corresponding to between the first magnetic separation zone and the L-shaped port is rotatably arranged on the shell, a material guide area is reserved between the upper magnetic separation roller and the upper section of the L-shaped port, and also includes a feeding unit horizontally reciprocatingly arranged above the upper magnetic separation roller, the discharging direction of the feeding unit corresponds to the material guide area, and the first magnetic separation zone and the second magnetic separation zone are connected with relatively independent first conveying channels and second conveying channels, a lower magnetic separation roller located inside the second magnetic separation zone and corresponding to below the first conveying channel is rotatably arranged on the shell, and the bottom of the shell is provided with first and second discharge ports respectively connected to the second magnetic separation zone.

[0006] Preferably, the first discharge port is vertically arranged, and the second discharge port is V-shaped.

[0007] Preferably, a support frame is fixedly connected to the shell, and a gap space is reserved between the bottom of the support frame and the bottom of the shell.

[0008] Preferably, the support frame is provided with an adjustable material guide plate which is located below the first material discharge port and is inclined, and a pair of material blocking edges are fixedly connected to the material guide plate.

[0009] Preferably, the feeding unit comprises a feeding hopper, the bottom of which is connected to a material guide shell located above the upper magnetic separation roller, the material guide shell is connected to a material guide port on the side opposite to the material guide area, and a reciprocating mechanism is provided between the material guide shell and the support frame.

[0010] Preferably, the diameter of the top port of the feed hopper gradually decreases toward the diameter of the bottom port, the top of the material guide shell is horizontally arranged, and the bottom of the material guide shell is inclined.

[0011] Preferably, the reciprocating mechanism includes an L-shaped mounting frame fixedly connected to the support frame, a plurality of cross bars are slidably connected to the L-shaped mounting frame, one end of the cross bar is fixedly connected to the material guide shell, a spring fixedly connected between the material guide shell and the L-shaped mounting frame is sleeved on the surface of the cross bar, the other end of the cross bar is fixedly connected to a resistance block, and the surface of the resistance block is linked to a toggle portion.

[0012] Preferably, the toggle part includes a pair of vertical plates fixedly connected to the top wall of the L-shaped mounting frame, wherein a driving part is installed on one of the vertical plates, and an output end of the driving part is connected to a rotating rod rotatably arranged between the two vertical plates, and a toggle plate that fits the surface of the interference block is fixedly connected to the surface of the rotating rod, and a plurality of arc-shaped toggle plates are fixedly connected to the toggle plate, and a limiting part is provided between the material guide shell and the side corresponding to the shell body.

[0013] Preferably, the limiting part includes a limiting shell fixedly connected to the shell, an air delivery cavity is provided inside the limiting shell, an inner wall of the air delivery cavity is fitted with a matching movable plate, a push plate is fixedly connected to the movable plate, and the push plate passes through one side of the limiting shell to the outside and is fixedly connected to the corresponding side of the material guide shell.

[0014] Preferably, an air guiding hose communicating with the air delivery cavity is connected to the surface of the limiting shell, and the other end of the air guiding hose is connected to the top of the material guiding shell.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. The present invention arranges the upper magnetic separation roller and the lower magnetic separation roller inside the shell so that the material flowing in from the feed hopper and the material guide shell is first subjected to preliminary magnetic separation by the upper magnetic separation roller. At this stage, the upper magnetic separation roller can rapidly attract and separate the magnetic particles in the material by using its surface magnetic field. Subsequently, the material subjected to preliminary magnetic separation will continue to flow downward and enter the action area of ​​the lower magnetic separation roller for magnetic separation again. Under the coordinated action of the upper magnetic separation roller and the lower magnetic separation roller, the material can be subjected to multiple magnetic separation treatments. This graded magnetic separation method not only ensures the effective separation of magnetic materials, but also reduces the interference of non-magnetic materials, making the entire magnetic separation process more efficient and reliable.

[0017] 2. The present invention adopts the design of reciprocating shaking of the feed hopper and the guide shell in the horizontal direction to enable the material to fall evenly between the guide area and the upper magnetic separation roller for preliminary magnetic separation. This design not only ensures that the material can be evenly distributed, improves the uniformity and efficiency of the magnetic separation, but also cleverly utilizes this reciprocating motion process to air-dry the material before the material enters the shell for magnetic separation, thereby avoiding the damp material during the magnetic separation process, which may cause the deflection degree of mineral particles in the magnetic field to become smaller, the magnetic separation efficiency to be reduced, and it is difficult to effectively separate the magnetic material from the non-magnetic material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the cross-sectional structure of the shell of the upper and lower double-drum permanent magnetic dry magnetic separator provided by the present invention;

[0019] Figure 2 For the present invention Figure 1 A local enlarged structural diagram of the part;

[0020] Figure 3 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B in FIG.

[0021] Figure 4 A schematic diagram of the connection structure between the feed hopper and the guide shell of the upper and lower double-drum permanent magnetic dry separator provided by the present invention;

[0022] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of the guide shell;

[0023] Figure 6 A first structural schematic diagram of the upper and lower double-drum permanent magnetic dry magnetic separator provided by the present invention;

[0024] Figure 7 A second structural schematic diagram of the upper and lower double-drum permanent magnetic dry magnetic separator provided by the present invention;

[0025] Figure 8This is a third structural schematic diagram of the upper and lower double-drum permanent magnetic dry magnetic separator provided by the present invention.

[0026] In the figure: 1. Shell; 11. First magnetic separation zone; 12. Second magnetic separation zone; 13. L-shaped port; 14. First conveying channel; 15. Second conveying channel; 16. First discharge port; 17. Second discharge port; 2. Upper magnetic separation roller; 3. Material guide zone; 4. Lower magnetic separation roller; 5. Feed unit; 51. Feed hopper; 52. Material guide shell; 53. Material guide port; 54. L-shaped mounting frame; 55. Cross bar; 56. Spring; 57. Resistance block; 58. Vertical plate; 59. Driving unit; 510. Rotating rod; 511. Toggle plate; 512. Arc toggle plate; 513. Limiting shell; 514. Air delivery cavity; 515. Moving plate; 516. Push plate; 517. Air guide hose; 6. Support frame; 61. Material guide plate; 62. Material retaining edge. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0029] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Reference Figure 1 and Figure 6-Figure 8, an upper and lower double-drum permanent magnetic dry magnetic separator, comprising a shell 1, a first magnetic separation zone 11 and a second magnetic separation zone 12 are arranged inside the shell 1, an L-shaped port 13 connected to the first magnetic separation zone 11 is opened on the shell 1, an upper magnetic separation roller 2 corresponding to between the first magnetic separation zone 11 and the L-shaped port 13 is rotatably arranged on the shell 1, a material guide zone 3 is reserved between the upper magnetic separation roller 2 and the upper section of the L-shaped port 13, and also includes a feeding unit 5 horizontally reciprocatingly arranged above the upper magnetic separation roller 2, the discharging direction of the feeding unit 5 corresponds to the material guide zone 3, and a relatively independent first conveying channel 14 and a second conveying channel 15 are connected between the first magnetic separation zone 11 and the second magnetic separation zone 12, a lower magnetic separation roller 4 located inside the second magnetic separation zone 12 and corresponding to below the first conveying channel 14 is rotatably arranged on the shell 1, and a first discharge port 16 and a second discharge port 17 respectively connected to the second magnetic separation zone 12 are provided at the bottom of the shell 1.

[0031] The crushed powdered raw mineral material is fed into the feeding unit 5. The feeding unit 5 ensures that the material can evenly and continuously fall onto the surface of the upper magnetic separation roller 2 for primary magnetic separation under the action of overall horizontal reciprocating shaking. During the primary magnetic separation process, the magnetic material is adsorbed by the upper magnetic separation roller 2. As the upper magnetic separation roller 2 rotates, the magnetic material automatically falls into the second magnetic separation zone 12 under the guidance of the second conveying channel 15, and is finally discharged from the second discharge port 17. At the same time, the non-magnetic material enters the first conveying channel 14 connecting the first magnetic separation zone 11 and the second magnetic separation zone 12 along the guide zone 3. , falls onto the surface of the lower magnetic separation roller 4 for secondary magnetic separation. During the secondary magnetic separation process, the lower magnetic separation roller 4 further absorbs the magnetic materials that have not been captured by the upper magnetic separation roller 2 in the initial magnetic separation. As the lower magnetic separation roller 4 rotates, these magnetic materials are also discharged under the action of the second discharge port 17. Through the arrangement of the upper magnetic separation roller 2 and the lower magnetic separation roller 4, the magnetic separator realizes two magnetic separations of the materials, thereby improving the efficiency and accuracy of the magnetic separation. This graded magnetic separation method not only ensures the effective separation of the magnetic materials, but also reduces the interference of the non-magnetic materials, making the entire magnetic separation process more efficient and reliable.

[0032] It should also be noted that in the above technical solution, the magnetic field strengths of the upper magnetic separation roller 2 and the lower magnetic separation roller 4 are designed differently. Since the magnetic iron grades of minerals in the ore are different, the upper magnetic separation roller 2 and the lower magnetic separation roller 4 use different magnetic field strengths to better adapt to this difference. The upper magnetic separation roller 2 uses a relatively weak magnetic field strength to preliminarily screen out most of the materials with stronger magnetism, while the lower magnetic separation roller 4 uses a stronger magnetic field strength to further capture those materials that have not been adsorbed on the upper magnetic separation roller 2 but have slightly weaker magnetism. Through graded magnetic separation, that is, the setting of weak magnetic field strength first and then strong magnetic field strength, magnetic materials and non-magnetic materials can be more effectively separated, reducing repeated screening of materials during the magnetic separation process, thereby improving the overall magnetic separation efficiency. For materials with weaker magnetism, using a stronger magnetic field strength can reduce the wear of the upper magnetic separation roller 2, because there is no need for excessively strong magnetic force to adsorb these materials. Since the lower magnetic separation roller 4 mainly processes materials with relatively weak magnetism remaining after preliminary screening, it is reasonable to use a stronger magnetic field strength.

[0033] Of course, it should also be noted that the upper magnetic separation roller 2 and the lower magnetic separation roller 4 both use a separate drive source to operate, which simplifies the structure and facilitates subsequent maintenance and replacement. At the same time, the rotation speed and power of the upper magnetic separation roller 2 and the lower magnetic separation roller 4 are also different. In the present technical solution, the upper magnetic separation roller 2 uses a higher speed and a lower power to preliminarily screen out most of the materials with stronger magnetism, while the lower magnetic separation roller 4 uses a lower speed and a higher power to further capture those materials that have not been adsorbed on the upper magnetic separation roller 2 but have slightly weaker magnetism. By adjusting the speed and power, the magnetic materials and non-magnetic materials can be more effectively separated, thereby improving the efficiency and accuracy of magnetic separation.

[0034] Reference Figure 1The first discharge port 16 is vertically arranged to ensure that the material falls naturally under the action of gravity, and the flow is smoother, which reduces the blockage and accumulation of materials during the discharge process. The second discharge port 17 is V-shaped, which can make the material more dispersed during discharge, avoid the concentration and accumulation of materials at the discharge port, and improve the discharge efficiency. The shell 1 is fixedly connected with a support frame 6, and a gap space is reserved between the bottom of the support frame 6 and the bottom of the shell 1. The gap space provides sufficient space for the placement of an external collection box. When material is discharged from the second discharge port 17, the collection box can be conveniently placed in the gap space. The support frame 6 is provided with an adjustable guide plate 61 which is inclined below the first discharge port 16 and is used to guide the material falling from the first discharge port 16 to flow in a specific direction, thereby avoiding the accumulation and scattering of the material and improving the discharge efficiency. A pair of retaining edges 62 are fixedly connected to the guide plate 61, which can prevent the material from overflowing or splashing during the flow along the surface of the guide plate 61, thereby ensuring that the material can accurately fall into the designated collection area.

[0035] Reference Figure 1 , Figure 4 and Figure 5 The feeding unit 5 includes a feeding hopper 51, the bottom of which is connected to a material guide shell 52 located above the upper magnetic separation roller 2, and the material guide shell 52 is located on the side opposite to the material guide area 3 and is connected to a material guide port 53, the diameter of the top port of the feeding hopper 51 gradually decreases to the diameter of the bottom port, the top of the material guide shell 52 is horizontally arranged, and the bottom of the material guide shell 52 is inclined, and this inclined setting is only slightly inclined and will not be tilted too much. When the material is put into the feeding hopper 51 from the top port, the material naturally slides to the bottom port of the feeding hopper 51 under the action of gravity into the interior of the material guide shell 52, and slides downward along the inclined bottom wall of the material guide shell 52, and this inclined design ensures that the material can flow smoothly to the material guide port 53 without being stuck or retained inside the material guide shell 52.

[0036] Reference Figure 4A reciprocating mechanism is provided between the guide shell 52 and the support frame 6, and the reciprocating mechanism includes an L-shaped mounting frame 54 fixedly connected to the support frame 6, and a plurality of cross bars 55 are slidably connected to the L-shaped mounting frame 54, one end of the cross bar 55 is fixedly connected to the guide shell 52, and a spring 56 fixedly connected between the guide shell 52 and the L-shaped mounting frame 54 is sleeved on the surface of the cross bar 55, and a resistance block 57 is fixedly connected to the other end of the cross bar 55, and a toggle portion is linked to the surface of the resistance block 57, and the toggle portion includes a fixed A pair of vertical plates 58 are fixedly connected to the top wall of the L-shaped mounting frame 54, one of which is equipped with a driving unit 59, and the output end of the driving unit 59 is connected to a rotating rod 510 rotatably arranged between the two vertical plates 58, and a toggle plate 511 that fits the surface of the abutment block 57 is fixedly connected to the surface of the rotating rod 510, and a plurality of arc-shaped toggle plates 512 are fixedly connected to the toggle plate 511, and a limiting portion is provided between the guide shell 52 and the corresponding side of the shell 1. When the reciprocating mechanism is in use, it only needs to The driving unit 59 using the servo motor is started to drive the rotating rod 510 to rotate. As the rotating rod 510 rotates, the toggle plate 511 fixed on the rotating rod 510 also rotates together. The arc-shaped toggle plate 512 on the surface of the toggle plate 511 will periodically contact and squeeze the surface of the resistance block 57. When the resistance block 57 is squeezed by the arc-shaped toggle plate 512, the resistance block 57 will stretch the spring 56 through the cross bar 55 and push the guide shell 52 to move in the direction of the guide area 3. When the arc-shaped toggle plate 512 is pressed, the resistance block 57 will stretch the spring 56 through the cross bar 55 and push the guide shell 52 to move in the direction of the guide area 3. When 512 continues to rotate and disengages from the surface of the resistance block 57, the guide shell 52 is reset under the elastic force of the spring 56, and the resistance block 57 at one end of the cross bar 55 will again fit onto the surface of the dial 511 to prepare for the next extrusion. This continuous cycle enables the guide shell 52 and the feed hopper 51 to perform horizontal reciprocating swings during the material guiding process. This swing helps the material to be more evenly distributed in the guide shell 52, and finally falls into the upper magnetic separation roller 2 in a uniform manner for magnetic separation.

[0037] Reference Figure 2-Figure 5The limiting part includes a limiting shell 513 fixedly connected to the shell body 1, and an air delivery cavity 514 is arranged inside the limiting shell 513. The inner wall of the air delivery cavity 514 is fitted with a matching moving plate 515, and a push plate 516 is fixedly connected to the moving plate 515. The push plate 516 penetrates to one side of the outside of the limiting shell 513 and is fixedly connected to the corresponding side of the material guide shell 52. When the material guide shell 52 moves in the direction of the material guide area 3, the push plate 516 fixed on the material guide shell 52 will drive the moving plate 515 to slide along the inner wall of the air delivery cavity 514, which can further provide effective limiting and support for the material guide shell 52 during the horizontal reciprocating movement. The surface of the limiting shell 513 is connected to an air guide hose 517 connected to the air delivery cavity 514, and the other end of the air guide hose 517 is connected to the On the top of the material guide shell 52, when the movable plate 515 slides along the inner wall of the gas delivery cavity 514, the gas in the gas delivery cavity 514 will be blown to the inclined bottom wall of the material guide shell 52 through the gas guide hose 517, so as to air-dry the wet material and avoid the wet material during the magnetic separation process, which may cause the deflection degree of mineral particles in the magnetic field to become smaller, the magnetic separation efficiency to be reduced, and it is difficult to effectively separate the magnetic material from the non-magnetic material. Therefore, before the magnetic separation, the gas transported by the gas guide hose 517 can be evenly blown to the material in the material guide shell 52, effectively removing the moisture on its surface and making the material drier. This can not only increase the deflection degree of mineral particles in the magnetic field, but also enhance the magnetic separation effect, so that the magnetic material and the non-magnetic material can be separated more clearly.

[0038] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. Upper and lower double drum permanent magnetic dry magnetic separator, characterized in that: include: A shell (1), wherein a first magnetic separation zone (11) and a second magnetic separation zone (12) are arranged inside the shell (1), an L-shaped port (13) connected to the first magnetic separation zone (11) is opened on the shell (1), an upper magnetic separation roller (2) corresponding to the position between the first magnetic separation zone (11) and the L-shaped port (13) is rotatably arranged on the shell (1), and a material guide zone (3) is reserved between the upper magnetic separation roller (2) and the upper section of the L-shaped port (13); and further comprising: a feeding unit (5) horizontally reciprocatingly arranged above the upper magnetic separation roller (2), wherein the discharge direction of the feeding unit (5) corresponds to the material guiding area (3); and A relatively independent first conveying channel (14) and a second conveying channel (15) are connected between the first magnetic separation zone (11) and the second magnetic separation zone (12); a lower magnetic separation roller (4) is rotatably arranged on the shell (1) and is located inside the second magnetic separation zone (12) and corresponds to the lower part of the first conveying channel (14); and a first discharge port (16) and a second discharge port (17) are respectively connected to the second magnetic separation zone (12) at the bottom of the shell (1); The feeding unit (5) comprises a feeding hopper (51), the bottom of the feeding hopper (51) is connected to a material guide shell (52) located above the upper magnetic separation roller (2), the material guide shell (52) is located on a side opposite to the material guide area (3) and is connected to a material guide port (53), a support frame (6) is fixedly connected to the shell (1), and a reciprocating mechanism is provided between the material guide shell (52) and the support frame (6); The reciprocating mechanism comprises an L-shaped mounting frame (54) fixedly connected to the support frame (6), a plurality of cross bars (55) being slidably connected to the L-shaped mounting frame (54), one end of the cross bar (55) being fixedly connected to the material guide shell (52), a spring (56) being sleeved on the surface of the cross bar (55) and being fixedly connected between the material guide shell (52) and the L-shaped mounting frame (54), the other end of the cross bar (55) being fixedly connected to a resistance block (57), and a toggle portion being linked to the surface of the resistance block (57); The toggle portion comprises a pair of vertical plates (58) fixedly connected to the top wall of the L-shaped mounting frame (54), wherein a driving portion (59) is mounted on one of the vertical plates (58), an output end of the driving portion (59) is connected to a rotating rod (510) rotatably arranged between the two vertical plates (58), a toggle plate (511) that fits the surface of the abutment block (57) is fixedly connected to the surface of the rotating rod (510), a plurality of arc-shaped toggle plates (512) are fixedly connected to the toggle plate (511), and a limiting portion is provided between the material guide shell (52) and a side corresponding to the shell body (1); The limiting portion comprises a limiting shell (513) fixedly connected to the shell body (1); an air delivery cavity (514) is provided inside the limiting shell (513); a matching movable plate (515) is attached to the inner wall of the air delivery cavity (514); a push plate (516) is fixedly connected to the movable plate (515); one side of the push plate (516) extending through the outside of the limiting shell (513) is fixedly connected to a side corresponding to the material guide shell (52); an air guide hose (517) connected to the air delivery cavity (514) is connected to the surface of the limiting shell (513); the other end of the air guide hose (517) is connected to the top of the material guide shell (52).

2. The upper and lower double-drum permanent magnetic dry magnetic separator according to claim 1 is characterized in that: The first discharge port (16) is arranged vertically, and the second discharge port (17) is arranged in a V shape.

3. The upper and lower double-drum permanent magnetic dry magnetic separator according to claim 1, characterized in that: A gap space is reserved between the bottom of the support frame (6) and the bottom of the shell (1).

4. The upper and lower double-drum permanent magnetic dry magnetic separator according to claim 1, characterized in that: A material guide plate (61) is fixedly connected to the support frame (6) and is located below the first material outlet (16) and is arranged in an inclined manner. A pair of material blocking edges (62) are fixedly connected to the material guide plate (61).

5. The upper and lower double-drum permanent magnetic dry magnetic separator according to claim 1, characterized in that: The diameter of the top port of the feed hopper (51) gradually decreases toward the diameter of the bottom port; the top of the material guide shell (52) is arranged horizontally, and the bottom of the material guide shell (52) is arranged inclined.

Images