Multistage ore screening device

Abstract

An ore multi-stage screening device belongs to the technical field of ore grading and comprises a horizontally arranged sieve cylinder, an outer shell is arranged outside the sieve cylinder, an annular gap is formed between the sieve cylinder and the outer shell, a discharge pipe is arranged at the bottom of the outer shell, mesh holes are formed in the sidewall of the sieve cylinder inside the outer shell, a chute is arranged in the sieve cylinder, the front end of the chute is located in the sieve cylinder, the rear end of the chute is inclined downward and extends to the outside of the rear end of the sieve cylinder, a plurality of pusher plates are arranged on the inner wall of the sieve cylinder along the axial direction, the side of the pusher plate facing the rotating direction of the sieve cylinder is inclined toward the rear end of the sieve cylinder, a plurality of through holes are formed in the pusher plate, the size of the through holes is larger than that of the mesh holes, a protruding strip is arranged on the side of the pusher plate facing the rotating direction of the sieve cylinder, the pusher plate covers the length range of the chute inside the sieve cylinder, and a gap is formed between the pusher plate and the chute when the sieve cylinder rotates. The scheme can only perform multi-stage screening on ores, can effectively prevent small-size ores from mixing with large-size ores, and has better multi-stage screening effect.

Description

Technical Field

[0001] This invention belongs to the field of ore classification technology, and in particular relates to a multi-stage ore screening device. Background Technology

[0002] Ore screening equipment is essential in ore mining and production. Its purpose is to classify ores of different sizes. Existing screening equipment, in order to achieve multi-stage classification, typically uses multiple screens arranged vertically, with the mesh size of the upper screen larger than that of the lower screen. All screens are designed at an angle, so that the ore on each layer of screens is discharged from the lower end. Because this type of screening equipment cannot effectively control the falling speed of the ore on the screens, some ores smaller than the mesh size of the upper screen are also discharged from the upper screen due to inertia and impact. This results in a mixture of larger and smaller ores, thus affecting the classification effect. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a multi-stage ore screening device that can not only perform multi-stage screening of ore, but also effectively prevent small-sized ore from being mixed with large-sized ore, thus achieving better multi-stage screening results.

[0004] In order to achieve the objective of this invention, the following solution is proposed:

[0005] A multi-stage ore screening device includes: a horizontally arranged screen cylinder, an outer shell fitted around the screen cylinder, an annular gap between the screen cylinder and the outer shell, a discharge pipe at the bottom of the outer shell, a mesh opening on the side wall of the screen cylinder inside the outer shell, and a material trough inside the screen cylinder, with its front end located inside the screen cylinder and its rear end extending downwards to the outside of the rear end of the screen cylinder.

[0006] The inner wall of the screen cylinder is provided with multiple pusher plates along the axial direction. The side of the pusher plate facing the rotation direction of the screen cylinder is inclined towards the rear end of the screen cylinder. The pusher plate has multiple through holes, the size of which is larger than the mesh size. The edge of the pusher plate facing the rotation direction of the screen cylinder has a raised strip. The pusher plate covers the length of the material trough inside the screen cylinder. When the screen cylinder rotates, there is a gap between the pusher plate and the material trough.

[0007] The beneficial effects of this invention are as follows: the solution can classify ores into three categories—large, medium, and small—according to their size, achieving multi-stage screening, and can effectively prevent small-sized ores from mixing with larger-sized ores, thus helping to improve the grading effect. Attached Figure Description

[0008] The accompanying drawings described herein are merely illustrative of selected embodiments, not all possible implementations, and are not intended to limit the scope of the invention.

[0009] Figure 1A schematic diagram of the overall structure of the preferred embodiment of this application is shown.

[0010] Figure 2 A schematic diagram of the front end of the sieve cylinder of this application is shown.

[0011] Figure 3 The internal structure diagram of the sieve cylinder of this application is shown.

[0012] Figure 4 A schematic diagram of the structure of the rear end of the sieve cylinder of this application is shown.

[0013] The markings in the diagram are: screen cylinder-1, mesh-11, outer shell-2, discharge pipe-21, support-22, material trough-3, pusher plate-4, through hole-41, protrusion-42, hopper-5, feeding pipe-51, tower skid-6, and stop bar-7. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. However, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments.

[0015] like Figures 1 to 4 As shown, a multi-stage ore screening device includes: a horizontally arranged screen cylinder 1 with a feed inlet at the front end and a discharge outlet at the rear end; and a hopper 5 at the front end of the screen cylinder 1 for feeding ore into the screen cylinder 1.

[0016] Specifically, such as Figures 1 to 3 As shown, the screen cylinder 1 is fitted with an outer shell 2, and there is an annular gap between the screen cylinder 1 and the outer shell 2. The bottom of the outer shell 2 is provided with a discharge pipe 21, and the screen cylinder 1 has a mesh 11 on the side wall inside the outer shell 2. Specifically, the screen cylinder 1 is driven by a motor, which is connected to the screen cylinder 1 through a gear transmission or belt transmission structure. More specifically, the motor can be located on the outer shell 2.

[0017] Specifically, such as Figure 1 , Figure 3 As shown, a material trough 3 is provided inside the screen cylinder 1, with its front end located inside the screen cylinder 1 and its rear end extending downwards to the outside of the rear end of the screen cylinder 1.

[0018] Specifically, such as Figure 3 , Figure 4 As shown, the inner wall of the screen cylinder 1 is provided with multiple layers of pusher plates 4 along the axial direction. The side of the pusher plate 4 facing the rotation direction of the screen cylinder 1 is inclined towards the rear end of the screen cylinder 1. In this way, when the screen cylinder 1 rotates, the pusher plate 4 can push the ore inside the screen cylinder 1 towards the discharge port of the screen cylinder 1. In this embodiment, the rotation direction of the screen cylinder 1 is as follows: Figure 4As shown by the arc-shaped arrow in the diagram. The pusher plate 4 has multiple through holes 41, the size of which is larger than the mesh size 11. The edge of the pusher plate 4 facing the rotation direction of the screen cylinder 1 has protrusions 42, which facilitates the pusher plate 4 flipping larger ores onto the top of the trough 3, preventing the ores on the pusher plate 4 from quickly slipping off during the flipping process. Although the pusher plate 4 is inclined, it has a certain length along the axis of the screen cylinder 1, effectively delaying the discharge of ore from the rear end of the pusher plate 4. The specific length of the pusher plate 4 can be designed according to actual needs, ensuring that its length is greater than its width; for example, its length can be designed to be one-fifth, one-quarter, or one-sixth of the length of the screen cylinder 1. The pusher plate 4 covers the length of the trough 3 inside the screen cylinder 1. When the screen cylinder 1 rotates, there is a gap between the pusher plate 4 and the trough 3 to prevent collision.

[0019] During ore screening, the ore is fed into the front end of the screen cylinder 1. The screen cylinder 1 is driven by a motor to rotate inside the outer casing 2. Ore smaller than the mesh size 11 passes through the mesh 11 into the outer casing 2 and is discharged from the discharge pipe 21. Ore larger than the mesh size 11 moves towards the rear end of the screen cylinder 1 under the push of the pusher plate 4. Ore larger than the through hole 41 is rolled upwards along the inner wall of the screen cylinder 1 under the action of the pusher plate 4. When the pusher plate 4 is higher than the trough 3, the ore rolled up by the pusher plate 4 rolls back into the trough 3, and the pusher plate 4 continues to move upwards into the trough 3, ensuring that all the ore on the pusher plate 4 is properly disposed of. As the larger ore is lifted by the pusher plate 4, some ore larger than the mesh size 11 and smaller than the through hole 41 is also lifted. As the ore lifted by the pusher plate 4 rolls into the trough 3, this part of the ore can fall through the through hole 41 and return to the screen cylinder 1 to prevent ore larger than the mesh size 11 and smaller than the through hole 41 from entering the trough 3. The ore that enters the trough 3 is automatically discharged along the inclined trough 3. The ore larger than the mesh size 11 and smaller than the through hole 41 will move towards the rear end of the screen cylinder 1 under the action of the pusher plate 4 and be discharged from the discharge port at the rear end of the screen cylinder 1.

[0020] The above scheme can classify ores into three categories: large, medium, and small according to size. The smallest ores are screened through mesh 11 and discharged from discharge pipe 21. The largest ores are pushed into trough 3 by pusher plate 4 and then discharged from the rear end of trough 3. Medium-sized ores are discharged from the rear end of screen cylinder 1 by pusher plate 4. This scheme can effectively prevent small-sized ores from mixing with larger-sized ores and helps to improve the classification effect.

[0021] Preferred, such as Figure 4 As shown, each layer of pusher plates 4 is arranged in a circumferential array along the screen cylinder 1 to improve the classification efficiency and help reduce the large-sized ore that moves to the rear end of the screen cylinder 1, thus preventing large-sized ore from being discharged from the rear end of the screen cylinder 1.

[0022] Preferred, such as Figure 1 , Figure 2 As shown, the hopper 5 and the outer casing 2 are mounted on the same tower skid 6 to facilitate overall transfer and installation, and to help ensure the stability of the relative positions of the hopper 5, the outer casing 2, and the screen cylinder 1. More specifically, the front end of the feed trough 3 is connected to the end of the feeding pipe 51 at the front end of the hopper 5 inserted into the screen cylinder 1, and the rear end of the outer casing 2 is provided with a bracket 22 for suspending the feed trough 3.

[0023] Preferred, such as Figure 3 , Figure 4 As shown, the section of the pusher plate 4 that contacts the screen cylinder 1 is a single plate structure. The through hole 41 is close to the middle of the screen cylinder 1. It can also be understood that the through hole 41 is opened on the side of the pusher plate 4 facing the middle of the screen cylinder 1, so as to avoid the through hole 41 affecting the efficiency of the pusher plate 4 in pushing the ore to the rear end of the screen cylinder 1, and to prevent the ore with a size between the through hole 41 and the mesh 11 from staying in the screen cylinder 1 for a long time, so as to avoid affecting the discharge speed and classification efficiency of this part of the ore.

[0024] Further preferred, such as Figure 3 , Figure 4 As shown, multiple through holes 41 on the pusher plate 4 are arranged along the length of the screen cylinder 1 to further delay the time when the ore is discharged from the rear end of the pusher plate 4.

[0025] Preferred, such as Figure 4 As shown, multiple baffles 7 are arranged in a circumferential array at the rear end of the inner wall of the screen cylinder 1. The spacing between adjacent baffles 7 is consistent with the diameter of the through hole 41 to prevent ore larger than the through hole 41 from being discharged from the rear end of the screen cylinder 1. More preferably, the distance between the pusher plate 4 located at the rear end of the screen cylinder 1 and the baffles 7 is smaller than the spacing between adjacent baffles 7.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to be the only or limiting of the invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from its scope are all within the protection scope of the present invention.

Claims

1. A multi-stage ore screening device, characterized in that, include: A horizontally arranged screen cylinder (1) is fitted with an outer shell (2) and there is an annular gap between the screen cylinder (1) and the outer shell (2). A discharge pipe (21) is provided at the bottom of the outer shell (2). A mesh (11) is provided on the side wall of the screen cylinder (1) inside the outer shell (2). A material trough (3) is provided inside the screen cylinder (1), with its front end located inside the screen cylinder (1) and its rear end extending downwards to the outside of the rear end of the screen cylinder (1). The inner wall of the screen cylinder (1) is provided with multiple pusher plates (4) along the axial direction. The side of the pusher plate (4) facing the rotation direction of the screen cylinder (1) is inclined towards the rear end of the screen cylinder (1). Multiple through holes (41) are opened on the pusher plate (4), the size of which is larger than the size of the mesh (11). The edge of the side of the pusher plate (4) facing the rotation direction of the screen cylinder (1) is provided with a protrusion (42). The pusher plate (4) covers the length range of the material trough (3) located inside the screen cylinder (1). When the screen cylinder (1) rotates, there is a gap between the pusher plate (4) and the material trough (3).

2. The multi-stage ore screening device according to claim 1, characterized in that, Each layer of pusher plate (4) is arranged in a circumferential array along the screen cylinder (1).

3. The multi-stage ore screening device according to claim 1, characterized in that, The screen cylinder (1) is equipped with a hopper (5) at the front end for feeding ore into the screen cylinder (1).

4. The multi-stage ore screening device according to claim 3, characterized in that, The hopper (5) and the outer shell (2) are mounted on the same tower skid (6).

5. The multi-stage ore screening device according to claim 1, characterized in that, The section of the pusher plate (4) that contacts the screen cylinder (1) is a whole plate structure, and the through hole (41) is close to the middle of the screen cylinder (1).

6. The multi-stage ore screening device according to claim 5, characterized in that, Multiple through holes (41) on the pusher plate (4) are arranged along the length of the screen cylinder (1).

7. The multi-stage ore screening device according to claim 1, characterized in that, Multiple baffles (7) are arranged in a circular pattern along the rear end of the inner wall of the sieve cylinder (1), and the spacing between adjacent baffles (7) is consistent with the diameter of the through hole (41).

8. The multi-stage ore screening device according to claim 7, characterized in that, The distance between the pusher plate (4) located at the rear end of the screen cylinder (1) and the stop bar (7) is less than the interval between the stop bars (7).

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