High-efficiency environment-friendly screening device

Abstract

The utility model belongs to material screening technical field, specifically disclose a kind of efficient environmental protection type screening device, including frame, fixed mounting has screening box and discharging assembly on frame, co-axial setting is installed in screening box and inner tube and outer tube, fixed mounting has receiving plate on frame, receiving plate one end extends to inner tube, screening box below the frame is equipped with belt conveying mechanism;Wherein, inner tube inside fixed mounting has driving shaft, fixed mounting has motor on frame, and the output end of motor is connected with driving shaft between through belt, ruffled groove is set up on inner tube, fixed mounting has limit pin on the inner wall of outer tube, limit pin sliding setting is in ruffled groove, utilize inner tube rotation to drive ruffled groove and limit pin cooperation, rotate movement accurate conversion is the high-frequency micro amplitude linear vibration of outer tube, make material fully loose, layering on outer tube screen surface, significantly improve the screening rate.

Description

Technical Field

[0001] This utility model belongs to the field of material screening technology, and specifically relates to a high-efficiency and environmentally friendly screening device. Background Technology

[0002] Screening is a key pretreatment step in the coal mining, washing and deep processing process. Its main function is to classify raw coal or crushed materials according to particle size to meet the particle size requirements of subsequent washing, transportation, combustion or comprehensive utilization processes.

[0003] Traditional screening equipment such as drum screens, circular vibrating screens, linear vibrating screens, and fixed screens are widely used in coal mines, but they are prone to clogging in actual operation. Especially when processing raw coal with high moisture, high ash, or high mud content, fine coal mud easily adheres to the screen surface and clogs the screen holes, resulting in a rapid reduction in the effective screening area, a significant decrease in screening accuracy and processing capacity, and in severe cases, frequent shutdowns for cleaning are required, affecting the continuity of production. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a highly efficient and environmentally friendly screening device.

[0005] To achieve the above objectives, this utility model provides a high-efficiency and environmentally friendly screening device, including a frame, on which a screening box and a feeding assembly are fixedly installed. An inner cylinder and an outer cylinder are coaxially arranged inside the screening box. A receiving plate is fixedly installed on the frame, with one end extending into the inner cylinder. A belt conveyor mechanism is installed on the frame below the screening box. A drive shaft is fixedly installed inside the inner cylinder, and a motor is fixedly installed on the frame. The output end of the motor is connected to the drive shaft via a belt. A corrugated groove is formed on the inner cylinder, and a limiting pin is fixedly installed on the inner wall of the outer cylinder, the limiting pin slidingly disposed within the corrugated groove.

[0006] In the above technical solution, the feeding assembly further includes a feeding hopper and a connecting cylinder, and the inner cylinder is rotatably connected to the connecting cylinder.

[0007] In the above technical solution, a sliding groove is further provided on the inner wall of the screening box, a slider is fixedly installed on the outer cylinder, and a spring is fixedly connected between the slider and the inner side of the sliding groove.

[0008] In the above technical solution, a pusher plate is slidably installed on the bottom surface of the screening box, and a first connecting arm is rotatably installed at both ends of the pusher plate. A second connecting arm is rotatably installed on the slider, and the first connecting arm and the second connecting arm are rotatably connected.

[0009] In the above technical solution, racks are fixedly installed at both ends of the pusher plate, a rotating shaft is rotatably installed inside the screening box, a striking rod is rotatably installed on the rotating shaft, and ratchet wheels are rotatably installed at both ends of the rotating shaft, with the racks meshing with the ratchet wheels.

[0010] In the above technical solution, the outer cylinder further includes a main frame and a screen, and corresponding screw holes are provided on both the main frame and the screen.

[0011] In the above technical solution, a dust cover is fixedly installed on the screening box, and a negative pressure exhaust pipe is provided on the top of the dust cover. A dust removal system is connected to the negative pressure exhaust pipe.

[0012] In the above technical solution, the screening box and the extension line of the frame form an angle α, where 10° < α < 20°.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By utilizing the rotation of the inner cylinder to drive the corrugated groove and the limiting pin, the rotational motion is precisely converted into high-frequency micro-amplitude linear vibration of the outer cylinder, which makes the material fully loose and layered on the screen surface of the outer cylinder, significantly improving the screening rate and effectively overcoming the problems of easy clogging and low screening efficiency of traditional screening equipment.

[0014] 2. The outer cylinder vibration drives the pusher plate to slide back and forth through the slider, spring and the first and second connecting arms, which promptly removes the material deposited at the bottom of the screening box and prevents material accumulation and blockage. The pusher plate drives the rack and pinion to mesh with the ratchet, causing the rotating shaft to rotate intermittently, which drives the striking rod to periodically tap the bottom of the screening box, promoting the falling of fine materials and further ensuring the continuity of screening. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure proposed in this utility model; Figure 2 This is a schematic diagram of the internal structure of the screening box proposed in this utility model; Figure 3 This is a schematic diagram of the inner and outer cylinder structures proposed in this utility model; Figure 4 This is a schematic diagram of the pusher plate installation structure proposed in this utility model; Figure 5 This is a plan view of the internal structure of the screening box proposed in this utility model.

[0016] In the diagram: 10. Frame; 20. Screening box; 21. Pusher plate; 22. First connecting arm; 23. Second connecting arm; 24. Rack; 25. Rotating shaft; 26. Striking rod; 27. Ratchet; 28. Dust cover; 29. ​​Negative pressure exhaust pipe; 201. Slide groove; 202. Spring; 30. Feeding assembly; 31. Feeding hopper; 32. Connecting cylinder; 40. Inner cylinder; 41. Drive shaft; 42. Corrugated groove; 50. Outer cylinder; 51. Limit pin; 52. Slider; 53. Main frame; 54. Screen; 60. Receiving plate; 70. Belt conveyor mechanism; 80. Motor. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example: like Figure 1 - Figure 5 The high-efficiency and environmentally friendly screening device shown includes a frame 10, on which a screening box 20 and a feeding assembly 30 are fixedly installed. The screening box 20 contains an inner cylinder 40 and an outer cylinder 50 arranged coaxially. A receiving plate 60 is fixedly installed on the frame 10, with one end of the receiving plate 60 extending into the inner cylinder 40 to receive large particles after initial separation by the inner cylinder 40. A belt conveyor mechanism 70 is installed on the frame 10 below the screening box 20 to collect and output the fine materials that have passed through the screening box.

[0019] Specifically, a drive shaft 41 is fixedly installed inside the inner cylinder 40, and a motor 80 is fixedly installed on the frame 10. The output end of the motor 80 is connected to the drive shaft 41 by a belt, thereby driving the inner cylinder 40 to rotate uniformly around its axis. A corrugated groove 42 is provided on the inner cylinder 40. The corrugated groove 42 is a groove with a sinusoidal waveform along the outer wall of the inner cylinder 40. A limit pin 51 is fixedly installed on the inner wall of the outer cylinder 50. The limit pin 51 is slidably disposed in the corrugated groove 42.

[0020] Specifically, the screening box 20 is inclined relative to the horizontal plane, and the extension line of the screening box 20 and the frame 10 form an angle α, where 10° < α < 20°, and α is preferably 15°, so as to take into account both the material flow rate and the screening residence time.

[0021] During operation, the motor 80 is started, which drives the transmission shaft 41 to rotate via belt drive, thereby driving the inner cylinder 40 to rotate around its axis. The material to be screened falls into the inner cylinder 40 after entering the screening box 20 from the feeding component 30. As the inner cylinder 40 rotates, the material moves along the cylinder wall under the action of centrifugal force and gravity. The corrugated groove 42 on the inner cylinder 40 cooperates with the limiting pin 51 on the inner wall of the outer cylinder 50, converting the original rotational motion of the inner cylinder 40 into the linear motion and high-frequency micro-amplitude vibration of the outer cylinder 50, thereby promoting the material to be fully loosened, layered and efficiently screened on the screen surface of the outer cylinder 50.

[0022] Fine particles smaller than the screen openings of the outer cylinder 50 pass through the screen 54 of the outer cylinder 50 and fall into the belt conveyor mechanism 70 below, thus collecting the undersize material. Meanwhile, coarse particles are conveyed forward with the rotation of the inner cylinder 40 and finally discharged onto the receiving plate 60.

[0023] Reference Figure 1 The feeding assembly 30 includes a feeding hopper 31 and a connecting cylinder 32. The feeding hopper 31 is used to collect and guide the material to be screened into the connecting cylinder 32. The inner cylinder 40 is rotatably connected to the connecting cylinder 32 to form a material channel.

[0024] Reference Figures 2-5 The inner wall of the screening box 20 is symmetrically provided with axially extending grooves 201. A slider 52 is fixedly installed on the outer cylinder 50. The slider 52 is slidably disposed in the groove 201. A spring 202 is fixedly connected between the slider 52 and the inner side of the groove 201. The spring 202 provides a restoring force for the outer cylinder 50 on the one hand, and buffers its vibration and impact on the other hand, ensuring that the outer cylinder 50 makes a stable linear reciprocating motion under the drive of the corrugated groove 42 and the limiting pin 51.

[0025] Furthermore, a pusher plate 21 is slidably installed on the bottom surface of the screening box 20 to push the material deposited at the bottom of the screening box 20 and prevent material accumulation and blockage. The two ends of the pusher plate 21 are rotatably installed with a first connecting arm 22, and the slider 52 is rotatably installed with a second connecting arm 23. The first connecting arm 22 and the second connecting arm 23 are rotatably connected to form a linkage transmission mechanism. Thus, during the vibration process, the outer cylinder 50 drives the second connecting arm 23 to swing through the slider 52, thereby driving the first connecting arm 22 to push the pusher plate 21 to slide back and forth along the bottom surface of the screening box, realizing the automatic material cleaning function.

[0026] Furthermore, racks 24 are fixedly installed at both ends of the pusher plate 21, and a rotating shaft 25 is rotatably installed inside the screening box 20. A striking rod 26 is rotatably installed on the rotating shaft 25, and ratchet wheels 27 are rotatably installed at both ends of the rotating shaft 25. The racks 24 are meshed with the ratchet wheels 27. When the pusher plate 21 reciprocates, the racks 24 drive the ratchet wheels 27 to rotate intermittently in one direction, thereby driving the rotating shaft 25 and the striking rod 26 to oscillate periodically. During the oscillation, the striking rod 26 gently taps the bottom surface of the screening box 20, accelerating the feeding of fine materials and further improving the continuity and reliability of screening.

[0027] Reference Figure 3 The outer cylinder 50 adopts a modular and detachable structure, including a main frame 53 and a screen 54. Furthermore, corresponding screw holes are provided on both the main frame 53 and the screen 54. The screen 54 is fastened to the main frame 53 by bolts passing through the screw holes, so as to realize the quick installation, disassembly and replacement of the screen 54.

[0028] Reference Figure 1 A dust cover 28 is fixedly installed on the screening box 20 to prevent dust from spreading outward. Specifically, a negative pressure exhaust pipe 29 is located at the top of the dust cover 28, connected to a dust removal system. During the screening process, the dust removal system is activated to maintain a slight negative pressure inside the screening box 20, effectively drawing fine particles raised during screening into the negative pressure exhaust pipe 29, where they are ultimately collected and treated by the dust removal system. This design not only significantly reduces the impact of dust on the surrounding environment but also improves the air quality in the working area, protecting the health of operators.

[0029] Working Principle: During operation, the raw coal to be screened enters the screening box 20 through the feeding component 30 and falls into the inner cylinder 40. Driven by the motor 80, the inner cylinder 40 rotates uniformly around its axis, and the material moves forward along the cylinder wall under the combined action of centrifugal force and gravity. At the same time, the sinusoidal corrugated groove 42 on the outer wall of the inner cylinder 40 cooperates with the limiting pin 51 on the inner wall of the outer cylinder 50 to convert the continuous rotational motion of the inner cylinder 40 into high-frequency micro-amplitude linear reciprocating vibration of the outer cylinder 50 along the axial direction of the screening box 20. Under the vibration of the outer cylinder 50, the material is fully loosened and stratified on its screen 54: fine particles with a particle size smaller than the screen holes quickly pass through the screen and fall into the belt conveyor mechanism 70 below for centralized output; while coarse particles continue to be conveyed forward with the rotation of the inner cylinder 40 and are finally discharged. The material is discharged to the receiving plate 60, achieving effective separation of coarse and fine materials. At the same time, the vibration of the outer cylinder 50 drives the pusher plate 21 to slide back and forth through the slider 52, spring 202, first connecting arm 22, and second connecting arm 23, which promptly removes the material deposited at the bottom of the screening box 20 and prevents material accumulation and blockage. The pusher plate 21 drives the rack 24 to mesh with the ratchet 27, causing the rotating shaft 25 to rotate intermittently, driving the striking rod 26 to periodically tap the bottom surface of the screening box 20, promoting the falling of fine materials and further ensuring the continuity of screening.

[0030] In addition, the overall tilting of the screening box 20 takes into account both the material flow rate and the screening residence time; the outer cylinder 50 adopts a modular main frame 53 and a replaceable screen 54 structure, which is convenient for maintenance and particle size adjustment; the fully enclosed dust cover 28, together with the top negative pressure exhaust pipe 29 and the external dust removal system, maintains a slight negative pressure state inside the box, effectively suppressing dust dispersion and meeting the environmental protection requirements of green mines.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-efficiency and environmentally friendly screening device, comprising a frame (10), characterized in that, A screening box (20) and a feeding assembly (30) are fixedly installed on the frame (10). An inner cylinder (40) and an outer cylinder (50) are coaxially arranged inside the screening box (20). A receiving plate (60) is fixedly installed on the frame (10). One end of the receiving plate (60) extends into the inner cylinder (40). A belt conveyor mechanism (70) is installed on the frame (10) below the screening box (20). The inner cylinder (40) is fixedly installed with a drive shaft (41), and the frame (10) is fixedly installed with a motor (80). The output end of the motor (80) is connected to the drive shaft (41) by a belt. The inner cylinder (40) is provided with a corrugated groove (42), and the inner wall of the outer cylinder (50) is fixedly installed with a limiting pin (51). The limiting pin (51) is slidably disposed in the corrugated groove (42).

2. The high-efficiency and environmentally friendly screening device according to claim 1, characterized in that, The feeding assembly (30) includes a feeding hopper (31) and a connecting cylinder (32), and the inner cylinder (40) is rotatably connected to the connecting cylinder (32).

3. The high-efficiency and environmentally friendly screening device according to claim 1, characterized in that, The inner wall of the screening box (20) is provided with a sliding groove (201), and a slider (52) is fixedly installed on the outer cylinder (50). A spring (202) is fixedly connected between the slider (52) and the inner side of the sliding groove (201).

4. The high-efficiency and environmentally friendly screening device according to claim 3, characterized in that, A pusher plate (21) is slidably installed on the bottom surface of the screening box (20). A first connecting arm (22) is rotatably installed at both ends of the pusher plate (21). A second connecting arm (23) is rotatably installed on the slider (52). The first connecting arm (22) and the second connecting arm (23) are rotatably connected.

5. The high-efficiency and environmentally friendly screening device according to claim 4, characterized in that, The pusher plate (21) is fixedly installed with racks (24) at both ends. A rotating shaft (25) is rotatably installed inside the screening box (20). A striking rod (26) is rotatably installed on the rotating shaft (25). Ratchets (27) are rotatably installed at both ends of the rotating shaft (25). The racks (24) are meshed with the ratchet (27).

6. The high-efficiency and environmentally friendly screening device according to claim 1, characterized in that, The outer cylinder (50) includes a main frame (53) and a screen (54), and corresponding screw holes are provided on the main frame (53) and the screen (54).

7. The high-efficiency and environmentally friendly screening device according to claim 1, characterized in that, A dust cover (28) is fixedly installed on the screening box (20). A negative pressure exhaust pipe (29) is provided on the top of the dust cover (28). A dust removal system is connected to the negative pressure exhaust pipe (29).

8. The high-efficiency and environmentally friendly screening device according to claim 1, characterized in that, The screening box (20) and the extension line of the frame (10) form an angle α, where 10° < α < 20°.

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