Ore screening and grading all-in-one machine and screening and grading method

Abstract

The ore screening and grading all-in-one machine comprises a fixed seat, two mounting plates are arranged above the fixed seat, and two guide assemblies are arranged at the bottoms of the two mounting plates. An ore screening and grading method comprises the following steps that S1, during use, ore needing to be screened and graded is poured into a discharging hopper and slides to a screening plate through a discharging pipe, meanwhile, a first motor is started to drive a crankshaft to rotate circumferentially, and the screening plate moves in a reciprocating mode to shake the ore on the surface of the screening plate back and forth; and therefore, the ores with different sizes can be screened. By means of the reciprocating screening plate and the material control plate, the ore screening difficulty of the device can be reduced, the ore sorting efficiency and screening effect of the screening plate are improved, meanwhile, by means of cooperation of a second motor and a vibration motor, automatic cleaning and maintenance of the device can be achieved, and efficient operation of the device can be maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of ore screening and grading, and in particular to an integrated ore screening and grading machine and a screening and grading method. Background Art

[0002] Ore screening is the process of screening and classifying ores of different sizes after the ore is crushed. The ore screening and grading integrated machine is to install screening plates of different apertures on the same equipment, transport the ore to the upper end surface of the screening plate, screen the ore through multiple layers of screening plates, and classify the ore into various specifications and discharge it through different discharge ports.

[0003] However, the existing integrated ore screening and grading machine has the following disadvantages when performing screening and grading: Usually, the ore is poured directly from a fixed position onto the inclined screening plate for screening, which results in the ore not being evenly distributed on the screening plate, resulting in low screening and grading efficiency; Failure to regularly clean the ore accumulated on the screening plate can easily affect the screening effect of the device and make it difficult to maintain efficient operation of the device; The grading box for collecting the ore after screening and grading is often placed directly under the screening plate, lacking a limiting device, which easily causes the ore to scatter during the ore screening and grading process. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose an integrated ore screening and grading machine and a screening and grading method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An integrated machine for screening and grading ore, comprising a fixed seat, two mounting plates are arranged above the fixed seat, two guide assemblies are arranged at the bottom of the two mounting plates, the guide assembly located on the left side is linked with a shaking assembly, and a screening plate is arranged between the two mounting plates, the screening plate is arranged obliquely, and a first screening hole, a second screening hole and a third screening hole are opened on the surface of the screening plate from high to low, the aperture of the second screening hole is larger than the aperture of the first screening hole and smaller than the aperture of the third screening hole, a discharge hopper fixed between the two mounting plates is arranged below the first screening hole, the second screening hole and the third screening hole, two fixing frames are fixed on the top of the fixed seat, a lower hopper is fixed on the top of the two fixing frames, and a lower hopper is connected to the bottom of the lower hopper with a lowering pipe inclined toward the screening plate; The guide assembly includes two support frames respectively fixed at the bottom of the two mounting plates, the top of the fixing seat is provided with grooves matching the two support frames, and a guide rod movably penetrating the outer walls of the two support frames is fixed in the groove; The shaking assembly includes a T-shaped linkage plate fixed between two support frames, a first motor fixed to the top of a fixed seat is provided at the bottom of the T-shaped linkage plate, a crankshaft that movably passes through the bottom of the T-shaped linkage plate is fixed at the end of the output shaft of the first motor, and a sliding hole matching the crankshaft is opened on the surface of the T-shaped linkage plate.

[0006] Preferably, a flipping mechanism is provided at the bottom of the screening plate, and the flipping mechanism includes a second motor fixed on the surface of the right front support frame, a rotating shaft is fixed at the end of the output shaft of the second motor, a support rod fixed to the bottom of the screening plate is fixed on the surface of the rotating shaft, a vibration motor is installed at the bottom of the screening plate, and the screening plate is attached to the surface on the opposite side of the two mounting plates.

[0007] Preferably, a first grading box slidably inserted in the front wall of the fixed seat is provided below each of the discharge hoppers, a second grading box slidably inserted in the front wall of the fixed seat is provided below the end of the screening plate, three first sliding grooves matching the three first grading boxes are provided on the surface of the fixed seat, and a second sliding groove matching the second grading box is provided on the surface of the fixed seat.

[0008] Preferably, a material control plate affixed to a port of a feed pipe is fixed on the top of the screening plate, a material control hole is provided on a side wall of the material control plate, and the material control plate affixed to surfaces on opposite sides of two mounting plates.

[0009] Preferably, each of the first sliding groove and the second sliding groove is jointly provided with a locking assembly at both ends, and the locking assembly includes a U-shaped plate attached to the outer wall of the fixed seat, a slide plate slidably embedded in the side wall of the fixed seat is fixed to the inner side of the U-shaped plate, and the side wall of the fixed seat is provided with a sliding groove matching the slide plate, a fixing rod movably passing through the slide plate is fixed in the sliding groove, a spring is jointly connected between the bottom of the slide plate and the bottom of the sliding groove, and a right-angle pressing plate is fixed to the top of the U-shaped plate.

[0010] Preferably, a plurality of balls are movably embedded in the surface of each of the first sliding groove and the second sliding groove.

[0011] Preferably, one end of the crankshaft away from the first motor movably penetrates to the bottom of the lower hopper, and the surface of one end of the crankshaft extending into the lower hopper is fixedly connected to two stirring rods.

[0012] A method for screening and grading ore comprises the following steps: S1. When in use, pour the ore to be screened and graded into the lower hopper, so that it slides onto the screening plate through the lower pipe. At the same time, start the first motor to drive the crankshaft to rotate in a circle, so that the screening plate moves back and forth to shake the ore on its surface, so that ores of different sizes can be screened; S2. When the crankshaft rotates, the two stirring rods can also stir the ore in the lower hopper to prevent the ore from blocking the port of the lower hopper; S3. When the screening plate moves back and forth, it can also drive the material control plate to move back and forth synchronously. The material control holes can be used to make the ore in the lower hopper slide onto the screening plate intermittently, and cannot slide onto the screening plate continuously, so as to avoid the screening plate being unable to fully screen the ore due to the continuous falling of the ore, thereby reducing the difficulty of the screening plate in screening the ore; S4, when the screening plate moves back and forth, the ore screened by the first screening hole, the second screening hole and the third screening hole can fall into the corresponding first grading box through the corresponding discharge hopper, and the larger ore will continue to slide along the surface of the screening plate into the second grading box, so that the grading of ores of different sizes can be achieved; S5, after the grading is completed, the right-angle pressing plate is stepped down to move the U-shaped plate downward, and each first grading box and the second grading box can be pushed to be taken out; S6. Finally, the second motor is controlled to drive the screening plate to rotate clockwise, and then the vibration motor is started to vibrate the screening plate, so that the raw materials accumulated on the screening plate can be shaken off, thereby realizing automatic cleaning and maintenance of the device.

[0013] Compared with the existing technology, the advantages of this ore screening and grading machine are: The first motor drives the crankshaft to rotate in a circular motion, driving the screening plate to move back and forth to shake the ore on its surface, so that the ore can be evenly distributed through the first screening hole, the second screening hole and the third screening hole, thereby improving the screening efficiency and screening effect of the screening plate on the ore; By intermittently aligning the material control hole with the upper and lower material pipes of the lower hopper, the effect of intermittent material discharge of the ore in the lower hopper can be achieved, which can prevent the screening plate from being unable to fully screen the ore due to the continuous falling of the ore, thereby reducing the difficulty of the device in screening the ore and further improving the screening effect of the device; By controlling the second motor to drive the screening plate to rotate clockwise to a vertical state, and then starting the vibration motor to vibrate the screening plate, the raw materials accumulated on the screening plate can be shaken off, thereby realizing automatic cleaning and maintenance of the device, which helps to maintain the efficient operation of the device; The U-shaped plate limits each first grading box and each second grading box, thereby preventing them from being separated from the fixing seat when the device is working, so that the ore will not be scattered, thereby ensuring the stability of each first grading box and each second grading box when collecting ore; To sum up, the present invention can reduce the difficulty of screening ore by the device through the reciprocating screening plate and the material control plate, improve the sorting efficiency and screening effect of the screening plate on the ore, and at the same time, by using the cooperation of the second motor and the vibration motor, it can also realize automatic cleaning and maintenance of the device, which helps to maintain the efficient operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an integrated ore screening and grading machine proposed by the present invention; Figure 2 This is a schematic diagram of the side structure of an integrated ore screening and grading machine proposed by the present invention; Figure 3 This is a schematic diagram of the structure of a screening plate after flipping in an integrated ore screening and grading machine proposed by the present invention; Figure 4 This is a partial structural schematic diagram of an integrated ore screening and grading machine proposed by the present invention; Figure 5 This is a partial bottom-up structural schematic diagram of an integrated ore screening and grading machine proposed by the present invention; Figure 6 This is a schematic diagram of the structure of a locking component in an integrated ore screening and grading machine proposed by the present invention; Figure 7 The present invention provides a schematic diagram of the structure of the connection between the crankshaft and the stirring rod in an integrated ore screening and grading machine.

[0015] In the figure: 1 fixed seat, 2 mounting plate, 3 screening plate, 4 first screening hole, 5 second screening hole, 6 third screening hole, 7 discharge hopper, 8 fixed frame, 9 lower hopper, 10 support frame, 11 groove, 12 guide rod, 13 T-type linkage plate, 14 first motor, 15 crankshaft, 16 slide hole, 17 second motor, 18 rotating shaft, 19 vibration motor, 20 first grading box, 21 second grading box, 22 first sliding groove, 23 second sliding groove, 24 material control plate, 25 material control hole, 26 U-shaped plate, 27 right angle stepping plate, 28 slide plate, 29 slide groove, 30 spring, 31 ball, 32 stirring rod. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Reference Figures 1 to 7 A ore screening and grading integrated machine includes a fixed seat 1, two mounting plates 2 are arranged above the fixed seat 1, two guide assemblies are arranged at the bottom of the two mounting plates 2, the guide assembly includes two support frames 10 respectively fixed at the bottom of the two mounting plates 2, a groove 11 matching the two support frames 10 is opened on the top of the fixed seat 1, a guide rod 12 movably penetrating the outer walls of the two support frames 10 is fixed in the groove 11, so that the two mounting plates 2 can move synchronously back and forth on the fixed seat 1, playing the role of limiting guidance.

[0018] A screening plate 3 is provided between the two mounting plates 2, and a flip mechanism is provided at the bottom of the screening plate 3. The flip mechanism includes a second motor 17 fixed to the surface of the right front support frame 10, a rotating shaft 18 is fixed to the end of the output shaft of the second motor 17, and a support rod fixed to the bottom of the screening plate 3 is fixed to the surface of the rotating shaft 18. A vibration motor 19 is installed at the bottom of the screening plate 3, and the screening plate 3 is attached to the surface of the opposite side of the two mounting plates 2. After each screening and grading operation is completed, the second motor 17 can be controlled to drive the screening plate 3 to rotate clockwise to Figure 3 The vibration motor 19 is then started to vibrate the screening plate 3, which can effectively shake off the raw materials accumulated in the first screening hole 4, the second screening hole 5 and the third screening hole 6 on the screening plate 3, thereby realizing automatic cleaning and maintenance of the screening plate 3 to ensure the screening effect of the screening plate 3 and help maintain the efficient operation of the device.

[0019] The screening plate 3 is arranged at an incline, and a first screening hole 4, a second screening hole 5 and a third screening hole 6 are provided on the surface of the screening plate 3 from high to low. The aperture of the second screening hole 5 is larger than that of the first screening hole 4 and smaller than that of the third screening hole 6. When in use, the ore to be screened and graded is first poured into the lower hopper 9, and then slides onto the screening plate 3 through the lower pipe. The ores of different sizes can be screened through the first screening hole 4, the second screening hole 5 and the third screening hole 6 on the screening plate 3.

[0020] A discharge hopper 7 fixed between the two mounting plates 2 is provided below the first screening hole 4, the second screening hole 5 and the third screening hole 6, a first grading box 20 slidably inserted in the front wall of the fixing seat 1 is provided below each discharge hopper 7, and a second grading box 21 slidably inserted in the front wall of the fixing seat 1 is provided below the end of the screening plate 3. The ore screened by the first screening hole 4, the second screening hole 5 and the third screening hole 6 can fall into the corresponding first grading box 20 through the corresponding discharge hopper 7, while the larger ore will continue to slide along the surface of the screening plate 3 into the second grading box 21, thereby realizing the grading operation of ores of different sizes.

[0021] The surface of the fixed seat 1 is provided with three first sliding grooves 22 corresponding to the three first grading boxes 20, and the surface of the fixed seat 1 is provided with a second sliding groove 23 matching the second grading box 21. A plurality of balls 31 are movably embedded on the surface of each of the first sliding grooves 22 and the second sliding grooves 23. When it is necessary to take out and push each of the first grading boxes 20 and the second grading boxes 21, the friction resistance between each of the first grading boxes 20 and the second grading boxes 21 and the first sliding grooves 22 and the second sliding grooves 23 can be reduced by rolling each of the corresponding balls 31, so that each of the first grading boxes 20 and the second grading boxes 21 can be more easily pushed out, which facilitates the removal and unloading of each of the first grading boxes 20 and the second grading boxes 21.

[0022] The guide assembly on the left side is linked to a shaking assembly, which includes a T-shaped linkage plate 13 fixed between two support frames 10, and a first motor 14 fixed to the top of the fixed seat 1 is provided at the bottom of the T-shaped linkage plate 13. A crankshaft 15 that movably passes through the bottom of the T-shaped linkage plate 13 is fixed at the end of the output shaft of the first motor 14. The end of the crankshaft 15 away from the first motor 14 movably passes through the bottom of the lower hopper 9, and the surface of one end of the crankshaft 15 extending into the lower hopper 9 is fixedly connected to two stirring rods 32. When the first motor 14 drives the crankshaft 15 to rotate, the two stirring rods 32 can also rotate synchronously to achieve stirring of the ore in the lower hopper 9, which can effectively prevent the ore from blocking the port of the lower hopper 9.

[0023] A sliding hole 16 matching the crankshaft 15 is provided on the surface of the T-shaped linkage plate 13. During screening, the first motor 14 is started to drive the crankshaft 15 to rotate, so that the crankshaft 15 moves in a circle away from one end of the first motor 14, and then slides back and forth in the sliding hole 16, so that the screening plate 3 can be driven to move back and forth through the T-shaped linkage plate 13 and the two guide components, so that the ore on the screening plate 3 can be shaken back and forth, so that the ore can be evenly distributed through the first screening hole 4, the second screening hole 5 and the third screening hole 6, thereby improving the screening efficiency and screening effect of the screening plate 3 for the ore.

[0024] Two fixing frames 8 are fixed on the top of the fixing seat 1, and a lower hopper 9 is fixed on the top of the two fixing frames 8. The bottom of the lower hopper 9 is connected to a lower feeding pipe inclined toward the screening plate 3. A control plate 24 is fixed on the top of the screening plate 3 and is fitted to the port of the lower feeding pipe. A control hole 25 is provided on the side wall of the control plate 24. The control plate 24 is fitted to the surface of the opposite side of the two mounting plates 2. When the screening plate 3 moves back and forth, it can also drive the control plate 24 to move back and forth synchronously, so that the control hole 25 can be intermittently aligned with the lower feeding pipe on the lower hopper 9, so as to achieve the effect of intermittent feeding of the ore in the lower hopper 9, so that the ore in the lower hopper 9 cannot continuously slide onto the screening plate 3, which can avoid the continuous falling of the ore causing the screening plate 3 to be unable to fully screen the ore, thereby reducing the difficulty of screening the ore by the screening plate 3, and further improving the screening effect of the device.

[0025] Both ends of each first sliding groove 22 and second sliding groove 23 are provided with a locking assembly, which includes a U-shaped plate 26 attached to the outer wall of the fixed seat 1, a slide plate 28 slidably embedded in the side wall of the fixed seat 1 is fixed to the inner side of the U-shaped plate 26, a slide groove 29 matching the slide plate 28 is opened on the side wall of the fixed seat 1, a fixing rod that movably penetrates the slide plate 28 is fixed in the slide groove 29, a spring 30 is commonly connected between the bottom of the slide plate 28 and the bottom of the slide groove 29, and a right-angle pressing plate is fixed to the top of the U-shaped plate 26 27, the U-shaped plate 26 can limit each of the first grading box 20 and the second grading box 21, preventing them from being separated from the fixing seat 1 when the device is working, so that the ore will not be scattered, ensuring the stability of each of the first grading box 20 and the second grading box 21 when collecting the ore. At the same time, when it is necessary to take out each of the first grading box 20 and the second grading box 21, the right-angle pressing plate 27 is stepped down to move the U-shaped plate 26 downward, and then each of the first grading box 20 and the second grading box 21 can be pushed to take it out.

[0026] A method for screening and grading ore comprises the following steps: S1. When in use, pour the ore to be screened and graded into the lower hopper 9, so that it slides onto the screening plate 3 through the lower pipe. At the same time, start the first motor 14 to drive the crankshaft 15 to rotate in a circle, so that the screening plate 3 moves back and forth to shake the ore on its surface, so that ores of different sizes can be screened; S2. When the crankshaft 15 rotates, the two stirring rods 32 can also stir the ore in the lower hopper 9 to prevent the ore from blocking the port of the lower hopper 9; S3, when the screening plate 3 moves back and forth, it can also drive the material control plate 24 to move back and forth synchronously, and the material control hole 25 can be used to make the ore in the lower hopper 9 slide onto the screening plate 3 intermittently, and cannot slide onto the screening plate 3 continuously, so as to avoid the screening plate 3 being unable to fully screen the ore due to the continuous falling of the ore, thereby reducing the difficulty of the screening plate 3 in screening the ore; S4, when the screening plate 3 moves back and forth, the ore screened by the first screening hole 4, the second screening hole 5 and the third screening hole 6 can fall into the corresponding first grading box 20 through the corresponding discharge hopper 7, and the larger ore will continue to slide along the surface of the screening plate 3 into the second grading box 21, so that the grading of ores of different sizes can be achieved; S5, after the grading is completed, the right-angle pressing plate 27 is stepped down to move the U-shaped plate 26 downward, and each first grading box 20 and the second grading box 21 can be pushed to be taken out; S6. Finally, the second motor 17 is controlled to drive the screening plate 3 to rotate clockwise to Figure 3 The vibrating motor 19 is then started to vibrate the screening plate 3, so that the raw materials accumulated on the screening plate 3 can be shaken off, thereby realizing automatic cleaning and maintenance of the device.

[0027] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated ore screening and grading machine, comprising a fixed base (1), characterized in that: Two mounting plates (2) are arranged above the fixing seat (1), two guide assemblies are arranged at the bottom of the two mounting plates (2), the guide assembly on the left side is linked with a shaking assembly, and a screening plate (3) is arranged between the two mounting plates (2), the screening plate (3) is arranged obliquely, and a first screening hole (4), a second screening hole (5) and a third screening hole (6) are opened on the surface of the screening plate (3) from high to low, the aperture of the second screening hole (5) is larger than the aperture of the first screening hole (4) and smaller than the aperture of the third screening hole (6), and a discharge hopper (7) fixed between the two mounting plates (2) is arranged below the first screening hole (4), the second screening hole (5) and the third screening hole (6), and two fixing frames (8) are fixed on the top of the fixing seat (1), and a lower hopper (9) is fixed on the top of the two fixing frames (8), and a lower hopper (9) is connected to the bottom of the lower hopper (9) with a lower pipe inclined toward the screening plate (3); The guide assembly comprises two support frames (10) respectively fixed to the bottom of the two mounting plates (2); a groove (11) matching the two support frames (10) is formed on the top of the fixing seat (1); a guide rod (12) movably penetrating the outer walls of the two support frames (10) is fixed in the groove (11); The shaking assembly comprises a T-shaped linkage plate (13) fixed between two support frames (10); a first motor (14) fixed to the top of a fixing seat (1) is provided at the bottom of the T-shaped linkage plate (13); a crankshaft (15) movably penetrating the bottom of the T-shaped linkage plate (13) is fixed at the end of an output shaft of the first motor (14); and a sliding hole (16) matching the crankshaft (15) is provided on the surface of the T-shaped linkage plate (13).

2. The integrated ore screening and grading machine according to claim 1, characterized in that: A flip mechanism is provided at the bottom of the screening plate (3), the flip mechanism comprising a second motor (17) fixed to the surface of the right front support frame (10), a rotating shaft (18) fixed to the end of the output shaft of the second motor (17), a support rod fixed to the bottom of the screening plate (3) fixed to the surface of the rotating shaft (18), a vibration motor (19) installed at the bottom of the screening plate (3), and the screening plate (3) is attached to the surface of the opposite side of the two mounting plates (2).

3. The ore screening and grading integrated machine and screening and grading method according to claim 1, characterized in that: A first grading box (20) slidably inserted in the front wall of the fixed seat (1) is provided below each of the discharge hoppers (7); a second grading box (21) slidably inserted in the front wall of the fixed seat (1) is provided below the end of the screening plate (3); three first sliding grooves (22) matching the three first grading boxes (20) are provided on the surface of the fixed seat (1); and a second sliding groove (23) matching the second grading box (21) is provided on the surface of the fixed seat (1).

4. The ore screening and grading integrated machine and screening and grading method according to claim 1, characterized in that: A material control plate (24) is fixed on the top of the screening plate (3) and is attached to the port of the material discharge pipe. A material control hole (25) is provided on the side wall of the material control plate (24). The material control plate (24) is attached to the surfaces of the opposite sides of the two mounting plates (2).

5. The integrated ore screening and grading machine according to claim 3, characterized in that: Both ends of each of the first sliding groove (22) and the second sliding groove (23) are provided with a locking assembly, the locking assembly comprising a U-shaped plate (26) fitted on the outer wall of the fixing seat (1), a sliding plate (28) slidably embedded in the side wall of the fixing seat (1) is fixed on the inner side of the U-shaped plate (26), a sliding groove (29) matching the sliding plate (28) is opened on the side wall of the fixing seat (1), a fixing rod movably penetrating the sliding plate (28) is fixed in the sliding groove (29), a spring (30) is commonly connected between the bottom of the sliding plate (28) and the bottom of the sliding groove (29), and a right-angle pressing plate (27) is fixed on the top of the U-shaped plate (26).

6. The integrated ore screening and grading machine according to claim 3, characterized in that: A plurality of rolling balls (31) are movably embedded in the surface of each of the first sliding groove (22) and the second sliding groove (23).

7. The integrated ore screening and grading machine according to claim 1, characterized in that: One end of the crankshaft (15) away from the first motor (14) movably penetrates the bottom of the lower hopper (9), and the surface of one end of the crankshaft (15) extending into the lower hopper (9) is fixedly connected to two stirring rods (32).

8. A method for ore screening and classification according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. When in use, the ore to be screened and graded is poured into the lower hopper (9), so that it slides onto the screening plate (3) through the lower pipe. At the same time, the first motor (14) is started to drive the crankshaft (15) to rotate in a circle, so that the screening plate (3) moves back and forth to shake the ore on its surface, thereby screening ores of different sizes; S2. When the crankshaft rotates, the two stirring rods (32) can also stir the ore in the lower hopper (9) to prevent the ore from blocking the port of the lower hopper (9); S3. When the screening plate (3) moves back and forth, it can also drive the material control plate (24) to move back and forth synchronously. The material control hole (25) can be used to allow the ore in the lower hopper (9) to slide onto the screening plate (3) intermittently, and not to slide onto the screening plate (3) continuously, thereby preventing the screening plate (3) from being unable to fully screen the ore due to the continuous falling of the ore, thereby reducing the difficulty of the screening plate (3) in screening the ore; S4, when the screening plate (3) moves back and forth, the ore screened by the first screening hole (4), the second screening hole (5) and the third screening hole (6) can fall into the corresponding first grading box (20) through the corresponding discharge hopper (7), while the larger ore will continue to slide along the surface of the screening plate (3) into the second grading box (21), thereby achieving the grading of ores of different sizes; S5, after the grading is completed, the right-angle pressing plate (27) is stepped downward to move the U-shaped plate (26) downward, and each first grading box (20) and the second grading box (21) can be pushed to be taken out; S6. Finally, the second motor (17) is controlled to drive the screening plate (3) to rotate clockwise, and then the vibration motor (19) is started to vibrate the screening plate (3), so that the raw materials accumulated on the screening plate (3) can be shaken off, thereby realizing automatic cleaning and maintenance of the device.

Images