Low-grade tailings iron multi-stage crushing and screening system for preparing construction aggregate

Abstract

The application relates to a low-grade tailing iron crushing and screening technical field, in particular to a multi-stage crushing and screening system for preparing low-grade tailing iron for building aggregate, which comprises a tailing crushing shell, a feeding hopper is arranged at the upper end of the tailing crushing shell, a power mechanism is arranged in the feeding hopper, two tooth-shaped crushing plate pieces are arranged on the power mechanism, one of the tooth-shaped crushing plate pieces is slidingly arranged in the feeding hopper, an installation groove is arranged on one side of the two tooth-shaped crushing plate pieces, and a synchronous shaft is arranged in the installation groove. The application can automatically operate, the two tooth-shaped crushing plate pieces can quickly crush the low-grade tailing iron, the low-grade tailing iron can be quickly preliminarily crushed, the crushed low-grade tailing iron can be finely crushed by the components in the tailing crushing shell, the low-grade tailing iron can be multi-stage crushed, the solid waste can be converted into building aggregate, and the reutilization rate of the waste is improved.

Description

Technical Field

[0001] This invention relates to the field of low-grade tailings iron crushing and screening technology, and in particular to a multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates. Background Technology

[0002] Iron ore in iron tailings can potentially be further recycled, and the remaining residue can be used for building aggregates and manufactured sand, thus improving the comprehensive utilization rate of iron tailings. Generally, iron tailings recycling technology involves crushing the tailings with a crusher to screen out usable iron ore, with the remaining residue used for building aggregates and manufactured sand. However, current iron tailings crushing and screening processes suffer from low iron ore recovery rates, low screening efficiency, high energy consumption, and high costs.

[0003] An iron tailings crushing and screening system, with announcement number CN112090940A, includes: a feeder, a first crusher, a first finished product silo, a lump ore separator, a second finished product silo, a powder ore separator, a second crusher, a finished product screening bin, a third finished product silo, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, a fifth transmission line, a sixth transmission line, a seventh transmission line, an eighth transmission line, a ninth transmission line, a tenth transmission line, an eleventh transmission line, a twelfth transmission line, a thirteenth transmission line, a fourteenth transmission line, a fifteenth transmission line, and a sixteenth transmission line. From the feeder to the finished product silo, it forms a complete iron tailings crushing and screening route. This system contains seven complete crushing and screening routes, which work together to flexibly switch between crushing and screening paths, implementing different processes, thereby achieving high-efficiency production and reducing energy consumption.

[0004] The above technical solution includes multiple crushing and conveying lines. However, in actual production, different crushing schemes are required for tailings of different specifications to ensure crushing effect. The existing technology clearly shows how each crusher operates to crush and convert tailings into screenable aggregates, so improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates includes a tailings crushing shell, with a feed hopper installed at the upper end of the tailings crushing shell. The feed hopper is equipped with a power mechanism, and the power mechanism is equipped with two toothed crushing plates, one of which is slidably installed inside the feed hopper. Each of the two toothed crushing plates has a mounting groove on one side, and a synchronous shaft is installed in the mounting groove. The two synchronous shafts are rotatably connected to a rotating rod, and the middle of one side of the vertical rotating rod is rotatably connected to one end side wall inside the feed hopper. Two movable slots are provided on the opposite side walls of the feed hopper, and movable plates are installed in each movable slot. All four movable plates are fixed on one of the toothed crushing plates.

[0007] Compared with existing technologies, this invention can operate automatically and facilitates the rapid crushing of low-grade tailings iron by two toothed crushing plates, enabling rapid initial crushing of low-grade tailings iron. Then, the components inside the tailings crushing shell further crush the crushed low-grade tailings iron, achieving multi-stage crushing of low-grade tailings iron and ensuring the quality of crushing.

[0008] Preferably, a driving mechanism is provided on one side of the tailings crushing shell, and the driving mechanism is provided with a double gear transmission assembly and an eccentric wheel. An opening is provided on the opposite side wall inside the tailings crushing shell, and a sliding component is slidably installed in the opening. Crushing rollers are rotatably sleeved on the opposite side wall inside the tailings crushing shell and on the two sliding components. One end of one of the crushing rollers passes through one of the sliding components and is connected to the double gear transmission assembly. A hydraulic telescopic assembly is rotatably connected to the top side of the tailings crushing shell. An inclined plate is rotatably connected to the piston rod end of the hydraulic telescopic assembly. An inclined tie rod is rotatably connected to both sides of the inclined plate. Two horizontal plate pieces are rotatably connected to the two inclined tie rods respectively. The two horizontal plate pieces are slidably installed on opposite side walls inside the tailings crushing shell. A damping elastic assembly is fixed between the horizontal plate piece and the sliding piece on the same side. An inclined screening hopper is provided through the lower end of the tailings crushing shell, and a vibration mechanism is provided on the inclined screening hopper, which is connected to an eccentric wheel; A screening mechanism is provided between the mounting frame and the tailings crushing shell, and the screening mechanism is located at the lower end of the inclined screening bucket.

[0009] Furthermore, this application can control the crushing effect of low-grade tailings iron according to the processing requirements of low-grade tailings iron, and can ensure that the material can enter between the two crushing rollers for crushing. When a relatively hard material appears, it can quickly drop the material to avoid damage to the crushing rollers. At the same time, it can also fully screen and classify the crushed low-grade tailings iron for subsequent processing according to the classification.

[0010] Preferably, the drive mechanism includes a first power motor assembly installed on one side of the tailings crushing shell. A linkage transmission assembly, a synchronous transmission assembly, and another crushing roller are installed on the output shaft of the first power motor assembly. An elastic adaptation assembly is installed on one side of the tailings crushing shell. The elastic adaptation assembly and the double gear transmission assembly are both connected to the linkage transmission assembly. One end of the eccentric wheel passes through the tailings crushing shell and is connected to the synchronous transmission assembly.

[0011] Furthermore, the first power motor assembly can consist of a motor, a coupling, and an output shaft, which can drive the synchronous transmission assembly and the linkage transmission assembly to operate. The synchronous transmission assembly consists of two pulleys and a belt fitted on them. The two pulleys are fixedly connected to the output shaft and the eccentric wheel, respectively. The linkage transmission assembly consists of three pulleys and a belt fitted on them. The elastic adaptation assembly consists of a sliding component that can be raised and lowered vertically and an elastic component fixed to one side of the sliding component and the tailings crushing shell. One of the pulleys in the linkage transmission assembly is connected to the sliding component. The elastic component helps to adapt to the raising and lowering of the pulleys on the sliding component, while also ensuring that the belt in the linkage transmission assembly is always in a taut state. At the same time, the double gear transmission assembly consists of two meshing gears. The remaining two pulleys in the linkage transmission assembly are fixedly connected to the output shaft and one of the gears, respectively. Through the reverse transmission of the meshing double gears, the two crushing rollers can rotate in opposite directions.

[0012] Preferably, the vibration mechanism includes multiple tension springs fixed to the bottom of the tailings crushing shell, each tension spring being fixedly connected to one end of the inclined screening bucket. The upper end of the inclined screening bucket is slidably installed at the bottom of the tailings crushing shell, and a rotating shaft is rotatably sleeved at the end of the inclined screening bucket located inside the tailings crushing shell. The eccentric wheel and the rotating shaft abut against each other.

[0013] Furthermore, when the eccentric wheel rotates, it will abut against the rotating shaft and cause the inclined screening bucket to move forward. At the same time, under the action of the tension spring, it can give the inclined screening bucket a reverse tension, so that the rotating shaft is always in contact with the rotating shaft. This allows the distance between the rotating shaft and the center of rotation of the eccentric wheel to be changed when the eccentric wheel rotates, ensuring that the inclined screening bucket continuously reciprocates and effectively screens the crushed low-grade tailings iron.

[0014] Preferably, the screening mechanism includes a screening component and a second motor assembly installed in a mounting frame. A spiral conveying rod is rotatably sleeved inside the screening component. The screening component is located at the lower end of the inclined screening hopper. One end of the spiral conveying rod passes through the screening component and is connected to the output shaft of the second motor assembly. Two first hopper assemblies are installed from top to bottom in the mounting frame. The upper first hopper assembly is connected to the end of the inclined screening hopper that extends out of the tailings crushing shell. The lower first hopper assembly corresponds to one end of the screening component. A discharge port is opened on the end of the screening component corresponding to the lower first hopper assembly. A second hopper assembly is fixed at the bottom of the mounting frame, and the second hopper assembly is located at the lower end of the screening component.

[0015] Furthermore, the second motor assembly can drive the screw conveyor rod to rotate. The rotation of the screw conveyor rod can move the low-grade tailings iron powder falling from the inclined screening hopper into the screening element. During the movement, the finer low-grade tailings iron powder can fall through the screening element into the second hopper assembly. The low-grade tailings iron fragments that cannot fall can enter the first hopper assembly located at the lower end through the discharge port. At the same time, the vibration of the inclined screening hopper can screen out the larger low-grade tailings iron particles and the low-grade tailings iron particles that are hard and not crushed, so that they can enter the first hopper assembly located at the upper end. This can effectively classify and facilitate subsequent targeted processing.

[0016] Preferably, the two first hopper assemblies are arranged in opposite directions.

[0017] Furthermore, by reversing the arrangement of the two first hopper components, the output material can move in the opposite direction, facilitating sorting and collection.

[0018] Preferably, both the inclined screening hopper and the screening element are inclined, and the inclined screening hopper and the screening element are arranged in opposite directions.

[0019] Furthermore, by tilting the device, the low-grade tailings iron falling onto it can move more quickly, improving the screening efficiency.

[0020] Preferably, the lower end of the screening element is arc-shaped.

[0021] Furthermore, the arc shape at the lower end of the screening component can conform to the structural characteristics of the screw conveyor rod, making it easier for the screw conveyor rod to move the crushed low-grade tailings iron stably and to effectively screen it.

[0022] Preferably, the power mechanism includes a motor assembly installed at the top of the feed hopper, a rotating rod fixed to the end of the output shaft of the motor assembly, a reciprocating rod rotatably connected to one end of the rotating rod, and a reciprocating rod rotatably connected to one side of another toothed crushing plate.

[0023] Furthermore, the motor assembly can provide power for the movement of another toothed crushing plate, and the rotating rod facilitates the reverse movement of the two toothed crushing plates, thereby quickly squeezing the low-grade tailings inside, ensuring impact force, and facilitating rapid crushing.

[0024] Preferably, the upper end of the feed hopper is provided with a filling port, and both toothed crushing plates are disposed through the filling port.

[0025] Furthermore, it facilitates the entry of low-grade tailings iron into the feed hopper through the packing inlet.

[0026] The beneficial effects of this invention are: 1. The motor assembly can provide power for the movement of another toothed crushing plate, and the rotating rod can facilitate the two toothed crushing plates to move in opposite directions, thereby quickly squeezing the low-grade tailings that have entered into it, ensuring impact force, and facilitating rapid crushing; 2. By operating the two crushing rollers in opposite directions, the crushing of low-grade tailings iron can be fully realized. Furthermore, the distance between the two crushing rollers can be controlled by the hydraulic telescopic components, inclined plates, horizontal plates, and damping elastic components, thereby adjusting the crushing effect and adapting to different crushing needs. 3. When low-grade tailings iron that is too hard to be crushed is encountered, the sliding component can apply pressure to the damping elastic component, causing the damping elastic component to contract. The contraction of the damping elastic component can make the distance between the two crushing rollers more convenient for the low-grade tailings iron to fall, thus avoiding damage to the crushing rollers. 4. The eccentric wheel and rotating shaft can drive the inclined screening bucket to move, and the tension spring facilitates the reciprocating screening of the inclined screening bucket. At the same time, the screw conveyor and screening components can also perform screening operations to screen the crushed materials and classify them according to the crushing condition. Attached Figure Description

[0027] Figure 1 This is a front view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the tailings crushing shell in this invention; Figure 4 This is a diagram showing the connection structure of the inclined screening bucket, rotating shaft, and eccentric wheel in this invention. Figure 5 This is a structural diagram of the screening component in this invention; Figure 6 This is a diagram showing the internal structure of the feed hopper in this invention; Figure 7 Appendix to this invention Figure 2 Enlarged view of point A; In the diagram: 1. Mounting frame; 2. Tailings crushing shell; 3. First power motor assembly; 4. Synchronous transmission assembly; 5. Linkage transmission assembly; 6. Elastic adaptation assembly; 7. Sliding component; 8. Opening; 9. Double gear transmission assembly; 10. Second motor assembly; 11. Second hopper assembly; 12. Feed hopper; 13. Hydraulic telescopic assembly; 14. Damping elastic assembly; 15. Horizontal plate; 16. Inclined screening hopper; 17. First hopper assembly; 18. Discharge port; 19. Screening component; 20. Spiral conveying rod; 21. Tension spring; 22. Inclined plate; 23. Inclined tie rod; 24. Crushing roller; 25. Rotating shaft; 26. Eccentric wheel; 27. Toothed crushing plate; 28. Filling port; 29. ​​Moving groove; 30. Moving plate; 31. Motor assembly; 32. Rotating rod; 33. Reciprocating rod; 34. Rotating rod; 35. Mounting groove; 36. Synchronous shaft. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Reference Figures 1-7 A multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates includes a tailings crushing shell 2, with a feed hopper 12 installed at the upper end of the tailings crushing shell 2. A power mechanism is installed inside the feed hopper 12, and two toothed crushing plates 27 are mounted on the power mechanism. One of the toothed crushing plates 27 is slidably installed inside the feed hopper 12. The power mechanism includes a motor assembly 31 installed at the top inside the feed hopper 12. A rotating rod 32 is fixed to the end of the output shaft of the motor assembly 31. One end of the rotating rod 32 is rotatably connected to a reciprocating rod 33, and one end of the reciprocating rod 33 is rotatably connected to one side of the other toothed crushing plate 27. The motor assembly 31 drives the rotating rod 32 to rotate, and the reciprocating rod 33 pulls the other toothed crushing plate 27. A toothed crushing plate 27 reciprocates to crush low-grade tailings iron. A filling port 28 is provided at the upper end of the feed hopper 12. Both toothed crushing plates 27 are installed through the filling port 28. Two moving grooves 29 are provided on the opposite side walls of the feed hopper 12. Moving plates 30 are installed in the moving grooves 29. All four moving plates 30 are fixed on one of the toothed crushing plates 27 to ensure the stability of the movement of one of the toothed crushing plates 27. The filling port 28 is provided at the upper end of the feed hopper 12. Both toothed crushing plates 27 are installed through the filling port 28 to facilitate the entry of low-grade tailings iron between the two toothed crushing plates 27 for crushing.

[0030] In this embodiment, each of the two toothed crushing plates 27 has a mounting groove 35 on one side, and a synchronous shaft 36 is installed in the mounting groove 35. A rotating rod 34 is rotatably connected between the two synchronous shafts 36. The middle of one side of the vertical rotating rod 34 is rotatably connected to one end side wall inside the feed hopper 12. Two moving grooves 29 are provided on the opposite side walls inside the feed hopper 12. Moving plates 30 are installed in the moving grooves 29. The four moving plates 30 are fixed on one of the toothed crushing plates 27. When the low-grade tailings iron is placed between the two toothed crushing plates 27, the starting motor assembly 31 drives the rotating rod 32 to rotate. The reciprocating rod 33 pulls the other toothed crushing plate 27 to move back and forth. Through the action of the rotating rod 34 and the synchronous shaft 36, the two toothed crushing plates 27 can operate in opposite directions, which facilitates the rapid crushing of low-grade tailings iron.

[0031] In this embodiment, a drive mechanism is provided on one side of the tailings crushing shell 2. The drive mechanism is equipped with a double gear transmission assembly 9 and an eccentric wheel 26. The drive mechanism can provide power and ensure that the corresponding crushing components in this system can operate, so as to achieve full crushing of low-grade tailings iron in order to prepare building aggregate.

[0032] In this embodiment, the drive mechanism includes a first power motor assembly 3 installed on one side of the tailings crushing shell 2. A linkage transmission assembly 5, a synchronous transmission assembly 4, and another crushing roller 24 are installed on the output shaft of the first power motor assembly 3. An elastic adaptation assembly 6 is installed on one side of the tailings crushing shell 2. The elastic adaptation assembly 6 and the double gear transmission assembly 9 are both connected to the linkage transmission assembly 5. One end of the eccentric wheel 26 passes through the tailings crushing shell 2 and is connected to the synchronous transmission assembly 4. The first power motor assembly 3 is a motor component that can output axial rotational power to drive the other crushing roller 24 to rotate. At the same time, it can also drive the linkage transmission assembly 5 and the synchronous transmission assembly 4 to operate. The synchronous transmission assembly 4 enables the eccentric wheel 26 to rotate with the first power motor assembly 3. The linkage transmission assembly 5 can drive the double gear transmission assembly 9 to operate and can also ensure power transmission when the double gear transmission assembly 9 moves. The double gear transmission assembly 9 consists of two meshing gears, which enable the two crushing rollers 24 to rotate in opposite directions, which facilitates the crushing operation of the low-grade tailings iron falling between the two crushing rollers 24.

[0033] In this embodiment, openings 8 are provided on opposite sidewalls inside the tailings crushing shell 2. Sliding members 7 are slidably installed inside the openings 8. Crushing rollers 24 are rotatably sleeved on opposite sidewalls inside the tailings crushing shell 2 and on the two sliding members 7. One end of one crushing roller 24 passes through one of the sliding members 7 and is connected to the double gear transmission assembly 9. The sliding member 7 can move within the opening 8. At the same time, two crushing rollers 24 are installed inside the tailings crushing shell 2. One crushing roller 24 is connected to the output shaft of the first power motor assembly 3 and can rotate in the same direction as the output shaft of the first power motor assembly 3. The other crushing roller 24 is connected to one gear in the double gear transmission assembly 9. The other gear in the double gear transmission assembly 9 is connected to the output shaft of the first power motor assembly 3 through the linkage transmission assembly 5. This allows the two crushing rollers 24 to rotate in opposite directions so as to crush the low-grade tailings iron that falls between the two crushing rollers 24.

[0034] In this embodiment, a hydraulic telescopic assembly 13 is rotatably connected to the top side of the tailings crushing shell 2. An inclined plate 22 is rotatably connected to the piston rod end of the hydraulic telescopic assembly 13. An inclined pull rod 23 is rotatably connected to both sides of the inclined plate 22. Two horizontal plate pieces 15 are rotatably connected to the two inclined pull rods 23 respectively. The two horizontal plate pieces 15 are slidably installed on opposite sidewalls inside the tailings crushing shell 2. A damping elastic assembly 14 is fixed between the horizontal plate piece 15 and the sliding member 7 on the same side. The hydraulic telescopic assembly 13 can extend and retract, and the extension and retraction of the hydraulic telescopic assembly 13 pushes the inclined plate 22 forward. The deflection helps ensure that low-grade tailings iron falls between the two crushing rollers 24 through the inclined plate 22. At the same time, when the hydraulic telescopic component 13 extends, the distance between the two crushing rollers 24 decreases, and the inclined plate 22 can drive the horizontal plate 15 to move towards the crushing rollers 24 through the inclined pull rod 23. Meanwhile, the crushing rollers 24 are composed of damping and resistance springs. When there is low-grade tailings iron that cannot be crushed, the crushing roller 24 located on the side of the damping elastic component 14 can move towards the horizontal plate 15, so that the low-grade tailings iron can fall and be screened out through the inclined screening bucket 16 for centralized processing.

[0035] In this embodiment, an inclined screening bucket 16 is provided through the lower end of the tailings crushing shell 2. A vibration mechanism is provided on the inclined screening bucket 16, and the vibration mechanism is connected to an eccentric wheel 26. The vibration mechanism includes multiple tension springs 21 fixed to the bottom of the tailings crushing shell 2. Each tension spring 21 is fixedly connected to one end of the inclined screening bucket 16. The upper end of the inclined screening bucket 16 is slidably installed at the bottom of the tailings crushing shell 2. A rotating shaft 25 is rotatably sleeved at the end of the inclined screening bucket 16 located inside the tailings crushing shell 2. The eccentric wheel 26... 6. The eccentric wheel 26 abuts against the rotating shaft 25. When the eccentric wheel 26 rotates, it abuts against the rotating shaft 25 and causes the inclined screening bucket 16 to move forward. At the same time, under the action of the tension spring 21, it can give the inclined screening bucket 16 a reverse tension force, so that the rotating shaft 25 always abuts against the rotating shaft 25. This allows the distance between the rotating shaft 25 and the rotating shaft of the eccentric wheel 26 to be changed when the eccentric wheel 26 rotates, ensuring that the inclined screening bucket 16 reciprocates and effectively screens the crushed low-grade tailings iron on it, so as to screen qualified aggregates.

[0036] In this embodiment, a screening mechanism is provided between the mounting frame 1 and the tailings crushing shell 2. The screening mechanism is located at the lower end of the inclined screening hopper 16. The screening mechanism includes a screening component 19 and a second motor assembly 10 installed in the mounting frame 1. A spiral conveying rod 20 is rotatably sleeved inside the screening component 19. The screening component 19 is located at the lower end of the inclined screening hopper 16. One end of the spiral conveying rod 20 passes through the screening component 19 and is connected to the output shaft of the second motor assembly 10. Two first hopper assemblies 17 are installed from top to bottom in the mounting frame 1. The first hopper assembly 17 at the upper end is connected to one end of the inclined screening hopper 16 extending out of the tailings crushing shell 2. The first hopper assembly 17 at the lower end corresponds to one end of the screening component 19. A discharge port 1 is opened on the end of the screening component 19 corresponding to the lower first hopper assembly 17. 8; The bottom of the mounting frame 1 is fixed with a second hopper assembly 11, which is located at the lower end of the screening component 19; the second motor assembly 10 can drive the screw conveyor 20 to rotate. The rotation of the screw conveyor 20 can drive the low-grade tailing iron powder falling from the inclined screening hopper 16 into the screening component 19 to move. During the movement, the finer low-grade tailing iron powder can fall through the screening component 19 into the second hopper assembly 11. The low-grade tailing iron fragments that cannot fall can enter the first hopper assembly 17 located at the lower end through the discharge port 18. At the same time, the vibration of the inclined screening hopper 16 can screen out the low-grade tailing iron particles that are larger and those that are not crushed due to their hardness, so that they can enter the first hopper assembly 17 located at the upper end. This can effectively classify the materials and facilitate the classification of aggregates.

[0037] In this embodiment, the two first hopper assemblies 17 are arranged in opposite directions. This reverse arrangement allows the output material to move in the opposite direction, facilitating sorting and collection. The inclined screening hopper 16 and the screening element 19 are both inclined and arranged in opposite directions. This inclined arrangement allows the low-grade tailings iron falling onto them to move more quickly, improving screening efficiency. The lower end of the screening element 19 is arc-shaped. The arc shape of the lower end of the screening element 19 conforms to the structural characteristics of the screw conveyor rod 20, facilitating the stable movement of the crushed low-grade tailings iron by the screw conveyor rod 20 and effectively screening it.

[0038] In this invention, low-grade tailings iron is placed between two toothed crushing plates 27. The starting motor assembly 31 drives the rotating rod 32 to rotate, and the reciprocating rod 33 pulls the other toothed crushing plate 27 to move back and forth. Through the action of the rotating rod 34 and the synchronous shaft 36, the two toothed crushing plates 27 can operate in opposite directions, which facilitates the rapid crushing of low-grade tailings iron. After preliminary crushing, the low-grade tailings iron will enter between two crushing rollers 24. The first power motor assembly 3 can directly drive one crushing roller 24 to rotate, and at the same time, through the linkage transmission assembly 5 and the double gear transmission assembly 9, it can drive the other crushing roller 24 to rotate. The two crushing rollers 24 will rotate in opposite directions, which can crush the low-grade tailings iron that falls between the two crushing rollers 24. The angle of the inclined plate 22 can be adjusted by the hydraulic telescopic component 13, and the inclined plate 22 can drive the horizontal plate 15 and the damping elastic component 14 through the inclined tie rod 23 to adjust the distance between the two crushing rollers 24. At the same time, the damping elastic component 14 can retract so that the low-grade tailings iron that cannot be crushed falls onto the inclined screening bucket 16. The first power motor assembly 3 drives the eccentric wheel 26 to rotate through the synchronous transmission assembly 4, which in turn abuts the rotating shaft 25, causing the inclined screening bucket 16 to move back and forth. The second motor assembly 10 can drive the spiral conveyor rod 20 to rotate, which facilitates the screening of low-grade tailings iron passing between the two crushing rollers 24.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low grade tailings iron multi-stage crushing and screening system for the production of construction aggregates, comprising a tailings crushing shell (2), characterised in that: The upper end of the tailings crushing shell (2) is equipped with a feed hopper (12). The feed hopper (12) is equipped with a power mechanism, and the power mechanism is equipped with two toothed crushing plates (27), one of which is slidably installed in the feed hopper (12); Each of the two toothed crushing plates (27) has a mounting groove (35) on one side. A synchronous shaft (36) is installed in the mounting groove (35). A rotating rod (34) is rotatably connected between the two synchronous shafts (36). The middle part of one side of the vertical rotating rod (34) is rotatably connected to one end side wall of the feed hopper (12). Two movable slots (29) are provided on the opposite side walls of the feed hopper (12), and movable plates (30) are installed in each movable slot (29). The four movable plates (30) are fixed on one of the toothed crushing plates (27).

2. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 1, characterized in that: A drive mechanism is provided on one side of the tailings crushing shell (2). The drive mechanism is provided with a double gear transmission assembly (9) and an eccentric wheel (26). An opening (8) is provided on the opposite side wall inside the tailings crushing shell (2). A sliding member (7) is slidably installed in the opening (8). Crushing rollers (24) are rotatably sleeved on the opposite side wall inside the tailings crushing shell (2) and on the two sliding members (7). One end of one of the crushing rollers (24) passes through one of the sliding members (7) and is connected to the double gear transmission assembly (9). A hydraulic telescopic assembly (13) is rotatably connected to the top side of the tailings crushing shell (2). An inclined plate (22) is rotatably connected to the piston rod end of the hydraulic telescopic assembly (13). An inclined tie rod (23) is rotatably connected to both sides of the inclined plate (22). Two horizontal plate pieces (15) are rotatably connected to the two inclined tie rods (23). The two horizontal plate pieces (15) are slidably installed on opposite side walls inside the tailings crushing shell (2). A damping elastic assembly (14) is fixed between the horizontal plate piece (15) and the sliding piece (7) on the same side. The lower end of the tailings crushing shell (2) is provided with an inclined screening bucket (16), and the inclined screening bucket (16) is provided with a vibration mechanism, which is connected to the eccentric wheel (26). A screening mechanism is provided between the mounting frame (1) and the tailings crushing shell (2), and the screening mechanism is located at the lower end of the inclined screening bucket (16).

3. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 2, characterized in that: The drive mechanism includes a first power motor assembly (3) installed on one side of the tailings crushing shell (2). The output shaft of the first power motor assembly (3) is equipped with a linkage transmission assembly (5), a synchronous transmission assembly (4) and another crushing roller (24). An elastic adaptation assembly (6) is installed on one side of the tailings crushing shell (2). The elastic adaptation assembly (6) and the double gear transmission assembly (9) are both connected to the linkage transmission assembly (5). One end of the eccentric wheel (26) passes through the tailings crushing shell (2) and is connected to the synchronous transmission assembly (4).

4. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 2, characterized in that: The vibration mechanism includes multiple tension springs (21) fixed to the bottom of the tailings crushing shell (2). The multiple tension springs (21) are all fixedly connected to one end of the inclined screening bucket (16). The upper end of the inclined screening bucket (16) is slidably installed at the bottom of the tailings crushing shell (2). The end of the inclined screening bucket (16) located in the tailings crushing shell (2) is rotatably sleeved with a rotating shaft (25). The eccentric wheel (26) and the rotating shaft (25) abut against each other.

5. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 2, characterized in that: The screening mechanism includes a screening component (19) and a second motor assembly (10) installed in the mounting frame (1). A spiral conveying rod (20) is rotatably sleeved inside the screening component (19). The screening component (19) is located at the lower end of the inclined screening bucket (16). One end of the spiral conveying rod (20) passes through the screening component (19) and is connected to the output shaft of the second motor assembly (10). Two first hopper assemblies (17) are installed from top to bottom in the mounting frame (1). The first hopper assembly (17) at the upper end is connected to one end of the inclined screening bucket (16) extending out of the tailings crushing shell (2). The first hopper assembly (17) at the lower end corresponds to one end of the screening component (19). A discharge port (18) is opened on the end of the screening component (19) corresponding to the first hopper assembly (17) at the lower end. A second hopper assembly (11) is fixed at the bottom of the mounting frame (1). The second hopper assembly (11) is located at the lower end of the screening component (19).

6. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 5, characterized in that: The two first hopper assemblies (17) are set in opposite directions.

7. The multi-stage crushing and screening system for preparing low-grade tailings iron for building aggregates according to claim 5, characterized in that: The inclined screening bucket (16) and the screening element (19) are both inclined and are arranged in opposite directions.

8. The multi-stage crushing and screening system for low-grade tailings iron used in the preparation of building aggregates according to claim 2, characterized in that: The lower end of the filter element (19) is arc-shaped.

9. A multi-stage crushing and screening system for low-grade tailings iron ore used in the preparation of building aggregates according to claim 1, characterized in that: The power mechanism includes a motor assembly (31) installed at the top of the feed hopper (12). A rotating rod (32) is fixed to the end of the output shaft of the motor assembly (31). One end of the rotating rod (32) is rotatably connected to a reciprocating rod (33). One end of the reciprocating rod (33) is rotatably connected to one side of another toothed crushing plate (27).

10. A multi-stage crushing and screening system for preparing low-grade tailings iron for building aggregates according to claim 1, characterized in that: The upper end of the feed hopper (12) is provided with a filling port (28), and two toothed crushing plates (27) are both installed through the filling port (28).

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