Ore raw material fineness screening device

Abstract

The ore raw material thickness screening device comprises a treatment box, a partition plate is arranged in the treatment box, a screening area and a collecting area are defined by the opposite end faces of the partition plate and the inner side wall of the treatment box, a first screen and a second screen are sequentially arranged in the screening area in the vertical direction, and the aperture of the first screen is larger than that of the second screen; the first screen and the second screen are obliquely arranged, and a first inlet and a second inlet are formed in the partition plate. The grinding machine has the effect of prolonging the service life of the grinding machine.

Description

Technical Field

[0001] This application relates to the field of ore equipment technology, and in particular to an ore raw material fineness screening device. Background Technology

[0002] Mineral powder is one of the commonly used raw materials in the building materials industry. In the preparation of mineral powder, it is necessary to use a grinding mill to crush and grind the ore to obtain mineral powder.

[0003] In existing technologies, when grinding ore raw materials, the ore raw materials are often directly fed into the feed channel, and the transport mechanism in the feed channel conveys the ore raw materials to the grinding mill for grinding. However, the mined ore raw materials usually have uneven particle size distribution. Although the grinding mill has a certain crushing capacity, when the ore with a larger particle size enters the grinding mill and is worn inside, it will cause the torque on the grinding roller to increase, which will lead to wear of the grinding roller, increased bearing load, and in severe cases, even equipment failures such as main shaft breakage. The service life of the grinding mill is reduced, which has obvious shortcomings. Utility Model Content

[0004] In order to improve the service life of the grinding mill, this application provides a fineness screening device for ore raw materials.

[0005] The ore raw material coarseness screening device provided in this application adopts the following technical solution:

[0006] A fineness screening device for ore raw materials includes a processing box. One end of the processing box has a feed inlet, and the other end has a discharge outlet connected to a grinding mill. A partition is installed inside the processing box. Opposite end faces of the partition and the inner wall of the processing box enclose a screening area and a collection area. Both the feed inlet and the discharge outlet are located in the screening area. A first screen and a second screen are sequentially arranged vertically in the screening area. The aperture of the first screen is larger than that of the second screen. Both the first and second screens are inclined along the width of the processing box. A first inlet and a second inlet are provided on the partition. The first inlet connects the upper surface of the first screen to the collection area, and the second inlet connects the upper surface of the second screen to the collection area.

[0007] By adopting the above technical solution, after the ore raw material enters the screening zone from the feed inlet, it is screened by the first and second screens, where ore of different particle sizes rolls along the screen surface under the action of gravity. The large aperture of the first screen first screens out the larger particles of ore and falls into the collection zone through the first inlet. The remaining ore continues to be screened by the small aperture of the second screen to screen out medium-sized particles and falls into the collection zone through the second inlet. Finally, the fine ore that meets the particle size requirements enters the grinding mill from the outlet. This avoids the problem of increased torque on the grinding rollers, accelerated wear, and excessive bearing load caused by the direct entry of larger particles into the grinding mill. It effectively reduces the probability of equipment failures such as spindle breakage and extends the service life of the grinding mill.

[0008] Optionally, the collection area is provided with a first crushing component and a second crushing component. The first crushing component is located between the first inlet and the second inlet, and the second crushing component is located below the second inlet. A transfer box is provided on the outer surface of the processing box. A transfer port is opened at the bottom of the collection area. One end of the transfer box is provided with a recycling port communicating with the transfer port, and the other end is connected to a feeding pipe communicating with the feed port. A transfer component is provided inside the transfer box to transfer the ore from the collection area to the feed port.

[0009] By adopting the above technical solution, when ore that does not meet the particle size requirements of the grinding mill enters the collection area, the first crushing component and the second crushing component crush the ore in sequence, so that the particle size of large or medium-sized ore particles is crushed to the size that meets the requirements of the second screen mesh. The crushed ore is returned to the feed inlet by the transfer component to participate in screening again. In this way, large and medium-sized ore particles that cannot pass through the first and second screens can enter the grinding mill after crushing, avoiding the waste of substandard ore and significantly improving the utilization rate of ore raw materials. At the same time, the circulating crushing and screening reduces the load on the grinding mill when processing ultra-large ore particles, further extending the service life of the grinding mill.

[0010] Optionally, the first crushing assembly includes two crushing rollers arranged opposite each other, each crushing roller having an end extending to the outer surface of the processing box and having a driven gear coaxially arranged thereon, the two driven gears meshing with each other, and a first motor for driving one of the crushing rollers to rotate is provided on the processing box.

[0011] By adopting the above technical solution, the two crushing rollers rotate synchronously under the drive of the first motor through meshing driven gears, which crushes the large ore particles that fall into the collection area, so that the large ore particles are effectively crushed into medium ore particles.

[0012] Optionally, the second crushing component includes crushing plates disposed on opposite sides of the collection area. Each crushing plate has multiple receiving cavities, and a drive shaft is rotatably connected inside each receiving cavity. Multiple pull ropes are wound around the drive shafts, and a crushing nail is disposed at the free end of each pull rope. Each crushing plate has a sliding groove corresponding to one of the multiple crushing nails. The crushing nail is slidably connected inside the corresponding sliding groove. A compression spring is disposed in each sliding groove. One end of the compression spring is disposed on the inner side wall of the sliding groove, and the other end is disposed on the crushing nail. The elastic force of the compression spring pushes the crushing nail to crush the gravel. The processing box is provided with a drive assembly corresponding to one of the two crushing plates. The drive assembly is used to drive the multiple drive shafts to rotate synchronously.

[0013] By adopting the above technical solution, after the ore crushed by the first crushing component falls between the two crushing plates, the drive component drives multiple drive shafts to rotate synchronously in the forward direction, thereby causing the pull rope to wind up on the drive shaft. The pull rope pulls the crushing nail into the corresponding sliding groove, which in turn compresses the compression spring, and the compression spring accumulates elastic potential energy under pressure. Subsequently, the drive component drives multiple drive shafts to rotate in the reverse direction, the pull rope relaxes on the drive shaft, and the elastic potential energy accumulated by the compression spring is quickly released, pushing the crushing nail out of the sliding groove to further crush the ore. By driving multiple drive shafts to rotate forward or in reverse, the crushing nail reciprocates within the sliding groove, thereby further crushing the ore crushed by the first crushing component to a particle size that meets the requirements of the second screen aperture, thus further reducing the possibility of large ore particles entering the grinding mill.

[0014] Optionally, the drive assembly includes a worm gear rotatably connected to the outer surface of the processing chamber, each drive shaft having an end extending to the outer surface of the processing chamber and having a worm wheel coaxially disposed therewith, meshing with the worm gear, and a second motor for driving the worm gear to rotate is disposed on the outer wall of the processing chamber.

[0015] By adopting the above technical solution, the second motor drives the worm to rotate, and the worm meshes with the worm wheel at the end of the drive shaft, thereby driving multiple drive shafts to rotate synchronously. By utilizing the high transmission ratio and stability of the worm gear transmission, it is ensured that each drive shaft rotates at the same speed, so that the pull rope pulls the crushing nail to achieve synchronous and regular reciprocating motion in the sliding groove, thereby achieving the crushing effect.

[0016] Optionally, the multiple crushing nails on the two crushing plates are arranged in an alternating manner.

[0017] By adopting the above technical solution, the staggered crushing nails enable the ore to be crushed by the crushing nails at different positions, effectively eliminating blind spots in the crushing area, avoiding dead angles caused by the neat arrangement of the crushing nails, and ensuring that the ore is fully and uniformly crushed when passing through the crushing plate, thereby improving the crushing effect of the second crushing component.

[0018] Optionally, the transfer assembly includes a pusher plate slidably connected to the bottom wall of the collection area, the pusher plate being disposed between the two crushing plates, a drive member being disposed on the outer surface of the processing box to drive the pusher plate to move along the width direction of the collection area, a conveying shaft being rotatably connected inside the transfer box, a spiral conveying plate being disposed on the outer surface of the conveying shaft, the outer surface of the spiral conveying plate being tightly fitted with the inner side wall of the transfer box, and a third motor being disposed on the transfer box to drive the conveying shaft to rotate.

[0019] By adopting the above technical solution, after the second crushing component finishes operating, the drive component drives the crushing nails to move into the sliding groove. At this time, the drive component drives the pusher plate to move towards the transfer box along the width direction of the collection area. The pusher plate pushes the crushed ore from the transfer port into the transfer box. Then, the third motor starts and drives the screw conveyor plate to rotate. The screw conveyor plate automatically lifts the ore in the transfer box into the feeding pipe. The ore that meets the particle size requirements of the grinding mill re-enters the screening area through the feeding pipe. In this way, the automated circulation transfer of crushed ore from the collection area to the feed port is realized, so that the crushed ore can participate in the screening again in a timely manner, which improves the ore transfer efficiency.

[0020] Optionally, the transfer port has a funnel-shaped opening, with the larger end of the transfer port facing the collection area.

[0021] By adopting the above technical solution, the funnel-shaped transfer port guides the crushed ore at the bottom of the collection area, allowing the ore to gather more smoothly into the transfer box under the guidance, effectively avoiding the problems of ore jamming or accumulation caused by the small opening of the transfer port or right-angle connection.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. In this embodiment of the application, by setting a first screen and a second screen, large and medium-sized particles of ore are screened through the first screen and the second screen. Finally, the fine ore that meets the particle size requirements enters the grinding mill from the outlet, thereby avoiding the problem of large particles of ore directly entering the grinding mill, which would lead to increased torque on the grinding roller, accelerated wear, and excessive bearing load. This effectively reduces the probability of equipment failures such as spindle breakage and extends the service life of the grinding mill.

[0024] 2. The embodiments of this application, by setting up a first crushing component, a second crushing component, and a transfer component, achieve further crushing and reuse of large and medium-sized ore particles, avoid the waste of substandard ore, significantly improve the utilization rate of ore raw materials, and at the same time reduce the load on the grinding mill for processing ultra-large ore particles through circulating crushing and screening, further extending the service life of the grinding mill. Attached Figure Description

[0025] Figure 1 This is a structural diagram of this application.

[0026] Figure 2 This is a cross-sectional view of the processing box in an embodiment of this application.

[0027] Figure 3 This is a cross-sectional view of the collection area and transfer box in an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Processing box; 101. Screening area; 102. Collection area; 103. Feed inlet; 104. Discharge outlet; 105. Transfer outlet; 2. Partition; 21. First inlet; 22. Second inlet; 23. First guide plate; 3. First screen; 4. Second screen; 5. First crushing assembly; 51. Crushing roller; 52. Driven gear; 53. First motor; 6. Second crushing assembly; 61. Crushing plate; 611. Receiving cavity; 612. Sliding groove; 62. Drive shaft; 63. Pull rope; 64. Crushing nail; 65. Compression spring; 7. Drive assembly; 71. Worm; 72. Worm wheel; 73. Second motor; 8. Transfer box; 81. Recovery outlet; 82. Feeding pipe; 9. Transfer assembly; 91. Pusher plate; 92. Drive component; 93. Conveying shaft; 94. Screw conveyor plate; 95. Third motor. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0030] This application discloses an ore raw material fineness screening device.

[0031] Reference Figure 1 and Figure 2 A fineness screening device for ore raw materials includes a processing box 1. A partition 2 is fixedly installed inside the processing box 1. The opposite end faces of the partition 2 and the inner side wall of the processing box 1 enclose a screening area 101 and a collection area 102. The processing box 1 has a feed inlet 103 at the top of the collection area 102 and a discharge outlet 104 connected to a grinding mill at the other end. Both the feed inlet 103 and the discharge outlet 104 are bucket-shaped.

[0032] Reference Figure 1 and Figure 2In the screening zone 101, a first screen 3 and a second screen 4 are fixedly installed in sequence along the vertical direction from the feed inlet 103 to the discharge outlet 104. The aperture of the first screen 3 is larger than that of the second screen 4. In this embodiment, the first screen 3 is used to screen large-particle ore raw materials, and the second screen 4 is used to screen medium-particle ore raw materials. Both the first screen 3 and the second screen 4 are inclined along the width direction of the processing box 1. A first inlet 21 and a second inlet 22 are provided on the partition plate 2. The first inlet 21 connects the upper surface of the first screen 3 and the collection zone 102, and the second inlet 22 connects the upper surface of the second screen 4 and the collection zone 102.

[0033] After the ore raw material enters the screening zone 101 through the feed inlet 103, it is screened by the first screen 3 and the second screen 4, where different particle sizes of ore roll along the screen surface under the action of gravity. The large aperture of the first screen 3 first screens out the larger particles of ore and falls into the collection zone 102 through the first inlet 21. The remaining ore continues to be screened through the small aperture of the second screen 4 to screen out medium-sized particles of ore and falls into the collection zone 102 through the second inlet 22. Finally, the fine ore that meets the particle size requirements enters the grinding mill through the discharge outlet 104. This avoids the problem of increased torque on the grinding rollers, accelerated wear, and excessive bearing load caused by the direct entry of larger particles into the grinding mill. It effectively reduces the probability of equipment failures such as spindle breakage and extends the service life of the grinding mill.

[0034] Reference Figure 1 and Figure 2 The collection area 102 is equipped with a first crushing component 5, which is located between the first inlet 21 and the second inlet 22. The first crushing component 5 includes two crushing rollers 51 rotatably connected inside the collection area 102. A first guide plate 23 is fixedly installed on the surface of the partition 2 facing the collection area 102. The outlet of the first guide plate 23 faces between the two crushing rollers 51. The end of each crushing roller 51 extends to the outer surface of the processing box 1 and is coaxially fixedly connected to a driven gear 52. The two driven gears 52 are meshed with each other. A first motor 53 that drives one of the crushing rollers 51 to rotate is fixedly installed on the outer surface of the processing box 1.

[0035] Driven by the first motor 53, the two crushing rollers 51 rotate synchronously through the meshing driven gears 52. Large ore particles roll along the first inlet 21 onto the first guide plate 23 and eventually fall between the two synchronously rotating crushing rollers 51. At this time, the two crushing rollers 51 squeeze and crush the large ore particles, so that the large ore particles are effectively crushed into medium-sized ore particles.

[0036] Reference Figure 1 and Figure 2A second crushing component 6 is provided in the collection area 102. The second crushing component 6 is located below the second inlet 22. The second crushing component 6 includes crushing plates 61 arranged on opposite sides of the collection area 102. One crushing plate 61 is fixedly installed on the surface of the partition plate 2, and the other crushing plate 61 is fixedly installed on the inner side wall of the processing box 1. The surfaces of the two crushing plates 61 near the crushing roller are inclined to guide the ore between the two crushing plates 61.

[0037] Reference Figure 1 and Figure 2 Each crushing plate 61 has multiple receiving cavities 611, which are parallel to the length direction of the crushing roller 51. Each receiving cavity 611 is rotatably connected to a drive shaft 62. Multiple pull ropes 63 are wound around the drive shaft 62 along its length. Each pull rope 63 has a crushing nail 64 fixedly connected to its free end. The multiple crushing nails 64 on the two crushing plates 61 are staggered. Each crushing plate 61 has a sliding groove 612 that corresponds one-to-one with the multiple crushing nails 64. The crushing nails 64 are slidably connected inside the corresponding sliding grooves 612.

[0038] Reference Figure 1 and Figure 2 Each sliding groove 612 is provided with a compression spring 65. One end of the compression spring 65 is fixedly connected to the inner side wall of the sliding groove 612, and the other end is fixedly connected to the crushing nail 64. The elastic force of the compression spring 65 pushes the end of the crushing nail 64 to extend between the two crushing plates 61 and crush the gravel.

[0039] Reference Figure 1 and Figure 2 The processing box 1 is equipped with a drive assembly 7 corresponding to the two crushing plates 61. The drive assembly 7 includes a worm 71 rotatably connected to the outer surface of the processing box 1. The worm 71 is perpendicular to the length direction of the drive shaft 62. The end of each drive shaft 62 extends into the outer surface of the processing box 1 and is coaxially fixedly connected to a worm wheel 72. Multiple worm wheels 72 are meshed with the worm 71. A second motor 73 corresponding to the two worms 71 is fixedly installed on the outer surface of the processing box 1. The output shaft of the second motor 73 is coaxially fixedly connected to the corresponding worm 71.

[0040] Medium-sized ore that cannot pass through the second screen 4 and ore that has been preliminarily crushed by the first crushing component 5 enter between the two crushing plates 61. At this time, the two second motors 73 start synchronously and drive the worm gear 71 to rotate in the forward direction. The worm gear 71 drives multiple drive shafts 62 to rotate synchronously through the meshing worm wheel 72, so that the pull rope 63 is wound on the drive shaft 62. The pull rope 63 pulls the crushing nail 64 into the corresponding sliding groove 612, thereby squeezing the compression spring 65. The compression spring 65 accumulates elastic potential energy under pressure.

[0041] Subsequently, the second motor 73 drives multiple drive shafts 62 to rotate in opposite directions through the transmission of the worm gear 71 and worm wheel 72. The pull rope 63 relaxes on the drive shaft 62, and the elastic potential energy accumulated by the compression spring 65 is quickly released, pushing the crushing nail 64 out of the sliding groove 612. The crushing nail 64 strikes the ore between the two crushing plates 61 to achieve secondary crushing. The second crushing component 6 further crushes the ore through the reciprocating crushing nail 64, so that the particle size of the ore is crushed to meet the particle size requirements of the grinding mill, thereby improving the utilization rate of the ore raw materials.

[0042] Reference Figure 2 and Figure 3 A transfer box 8 is fixedly installed on the outer surface of the processing box 1. A transfer port 105 is opened on the inner side wall of the processing box 1 at the bottom of the collection area 102. The transfer port 105 is funnel-shaped, with the larger end of the transfer port 105 facing the collection area 102. A recycling port 81 communicating with the transfer port 105 is opened at the bottom of the transfer box 8, and a feeding pipe 82 communicating with the feed port 103 is installed at the other end.

[0043] Reference Figure 2 and Figure 3 The transfer box 8 is equipped with a transfer component 9. The transfer component 9 includes a pusher plate 91 that is slidably connected to the bottom wall of the collection area 102. The pusher plate 91 is disposed between two crushing plates 61. A drive member 92 that drives the pusher plate 91 to move along the width direction of the collection area 102 is fixedly installed on the outer surface of the processing box 1. In this embodiment, the drive member 92 is a linear cylinder.

[0044] After the ore is fully crushed by the first crushing component 5 and the second crushing component 6, the second motor 73 drives the crushing nail 64 to retract into the sliding groove 612. At this time, the driving component 92 drives the pusher plate 91 to move towards the transfer box 8 along the width direction of the collection area 102. Under the guidance of the trumpet-shaped transfer port 105, the pusher plate 91 pushes the crushed ore into the transfer box 8.

[0045] Reference Figure 2 and Figure 3 The transfer box 8 is rotatably connected to a conveying shaft 93. A spiral conveying plate 94 is fixedly connected to the outer surface of the conveying shaft 93. The outer surface of the spiral conveying plate 94 is tightly fitted to the inner wall of the transfer box 8. A third motor 95 that drives the conveying shaft 93 to rotate is fixedly installed on the top wall of the transfer box 8.

[0046] After the ore enters the transfer box 8, the second motor 73 drives the spiral conveyor plate 94 to rotate. The spiral conveyor plate 94 automatically lifts the ore in the transfer box 8 into the feeding pipe 82. The ore that meets the particle size requirements of the grinding mill re-enters the screening zone 101 through the feeding pipe 82. The setup of the first crushing component 5, the second crushing component 6, and the transfer component 9 enables further crushing and reuse of large and medium-sized ore particles, avoiding the waste of substandard ore and significantly improving the utilization rate of ore raw materials. At the same time, the circulating crushing and screening reduces the load on the grinding mill when processing ultra-large ore particles, further extending the service life of the grinding mill.

[0047] The implementation principle of the ore raw material coarseness screening device in this application embodiment is as follows: After the ore raw material enters the screening zone 101 through the feed inlet 103, it is screened by the first screen 3 and the second screen 4, so that the ore of different particle sizes rolls along the screen surface under the action of gravity. The large aperture of the first screen 3 screens out the ore with larger particle size first and falls into the collection zone 102 through the first inlet 21. The remaining ore continues to be screened out by the small aperture of the second screen 4, and the ore with medium particle size falls into the collection zone 102 through the second inlet 22. Finally, the fine ore that meets the particle size requirements enters the grinding mill through the discharge outlet 104. This avoids the problem of increased torque on the grinding roller, aggravated wear and excessive bearing load caused by the direct entry of large particle size ore into the grinding mill. It effectively reduces the probability of equipment failure such as spindle breakage and extends the service life of the grinding mill.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fineness screening device for ore raw materials, comprising a processing box (1), wherein one end of the processing box (1) is provided with a feed inlet (103) and the other end is provided with a discharge outlet (104) communicating with a grinding mill, characterized in that, The processing box (1) is provided with a partition (2). The opposite end faces of the partition (2) and the inner side wall of the processing box (1) form a screening area (101) and a collection area (102). The feed inlet (103) and the discharge outlet (104) are both located in the screening area (101). The screening area (101) is provided with a first screen (3) and a second screen (4) in sequence along the vertical direction. The aperture of the first screen (3) is larger than that of the second screen (4). The first screen (3) and the second screen (4) are both inclined along the width direction of the processing box (1). The partition (2) is provided with a first inlet (21) and a second inlet (22). The first inlet (21) connects the upper surface of the first screen (3) and the collection area (102). The second inlet (22) connects the upper surface of the second screen (4) and the collection area (102).

2. The ore raw material coarseness screening device according to claim 1, characterized in that, The collection area (102) is provided with a first crushing component (5) and a second crushing component (6). The first crushing component (5) is located between the first inlet (21) and the second inlet (22). The second crushing component (6) is located below the second inlet (22). The outer surface of the processing box (1) is provided with a transfer box (8). The bottom of the collection area (102) is provided with a transfer port (105). One end of the transfer box (8) is provided with a recycling port (81) that communicates with the transfer port (105). The other end is provided with a feeding pipe (82) that communicates with the feed inlet (103). The transfer box (8) is provided with a transfer component (9) that transfers ore from the collection area (102) to the feed inlet (103).

3. The ore raw material fineness screening device according to claim 2, characterized in that, The first crushing assembly (5) includes two crushing rollers (51) arranged opposite to each other. The end of each crushing roller (51) extends to the outer surface of the processing box (1) and is coaxially provided with a driven gear (52). The two driven gears (52) mesh with each other. The processing box (1) is provided with a first motor (53) that drives one of the crushing rollers (51) to rotate.

4. The ore raw material coarseness screening device according to claim 2, characterized in that, The second crushing component (6) includes crushing plates (61) disposed on opposite sides of the collection area (102). Each crushing plate (61) has multiple receiving cavities (611), and each receiving cavity (611) is rotatably connected to a drive shaft (62). Multiple pull ropes (63) are wound around the drive shaft (62), and each pull rope (63) has a crushing nail (64) at its free end. Each crushing plate (61) has a sliding groove (612) corresponding to each of the multiple crushing nails (64). 4) Sliding connection is provided inside the corresponding sliding groove (612). Each sliding groove (612) is provided with a compression spring (65). One end of the compression spring (65) is provided on the inner side wall of the sliding groove (612), and the other end is provided on the crushing nail (64). The elastic force of the compression spring (65) pushes the crushing nail (64) to crush the gravel. The processing box (1) is provided with a drive assembly (7) corresponding to the two crushing plates (61). The drive assembly (7) is used to drive multiple drive shafts (62) to rotate synchronously.

5. The ore raw material coarseness screening device according to claim 4, characterized in that, The drive assembly (7) includes a worm gear (71) rotatably connected to the outer surface of the processing box (1). The end of each drive shaft (62) extends to the outer surface of the processing box (1) and is coaxially provided with a worm wheel (72) that meshes with the worm gear (71). A second motor (73) that drives the worm gear (71) to rotate is provided on the outer wall of the processing box (1).

6. The ore raw material coarseness screening device according to claim 4, characterized in that, Multiple breaking nails (64) on the two breaking plates (61) are staggered.

7. The ore raw material coarseness screening device according to claim 4, characterized in that, The transfer assembly (9) includes a pusher plate (91) slidably connected to the bottom wall of the collection area (102). The pusher plate (91) is disposed between the two crushing plates (61). The outer surface of the processing box (1) is provided with a drive member (92) that drives the pusher plate (91) to move along the width direction of the collection area (102). The transfer box (8) is rotatably connected to a conveying shaft (93). The outer surface of the conveying shaft (93) is provided with a spiral conveying plate (94). The outer surface of the spiral conveying plate (94) is tightly fitted with the inner side wall of the transfer box (8). The transfer box (8) is provided with a third motor (95) that drives the conveying shaft (93) to rotate.

8. The ore raw material fineness screening device according to claim 3, characterized in that, The transfer port (105) has a trumpet-shaped opening, with the larger end of the transfer port (105) facing the collection area (102).

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