Multi-stage dust removal equipment in grain screening process

Abstract

The invention discloses multi-stage dust removal equipment in a grain screening process, which comprises a vibrating screen and a dust remover communicated with the output end of the vibrating screen, the dust remover comprises a dust removal box, and a plurality of guide plates are sequentially and obliquely arranged in the dust removal box from top to bottom, so that the retention time and the movement path of grains in the dust removal box are greatly prolonged, and the dust removal efficiency is improved. Grain screened by the vibrating screen can enter the dust removal box through the feeding port, the grain entering the dust removal box sequentially passes through the multiple flow guide plates and then is discharged from the interior of the dust removal box through the discharging port, and a set of gas nozzles are arranged below the lower end of each flow guide plate. Each group of gas nozzles comprises a plurality of gas nozzles which are equidistantly arranged in the length direction of the guide plate, when grains flow down from the lower end of the guide plate, a uniform grain curtain can be formed, the grains are in a dispersed state, the gas nozzles blow air to the grains flowing down from the lower end of the guide plate at the moment, and airflow can fully penetrate through the grain curtain to be in contact with each grain; the action area is maximum, and a better dust removal effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain dust removal, and in particular to a multi-stage dust removal device in a grain screening process. BACKGROUND

[0002] In the process of collection, transportation, processing and storage, grains often mix with various impurities. Inorganic impurities in grains include dust, sand, mud, stones, bricks, tiles and metal objects. Organic impurities include roots, stems, leaves, shells and weeds. These impurities are harmful to grain processing and storage. Therefore, the impurities need to be removed before the grains are stored in a warehouse to meet the national grain safety quality standards. This is beneficial to the storage of grains and provides raw materials that meet the requirements for subsequent production and processing. In a grain storage warehouse, the convenience, efficiency and environmental protection of storage equipment are increasingly concerned. Grain screening and dust removal is a process that uses the physical characteristics of particles to separate impurities from grains through a series of mechanical and pneumatic methods, thereby improving the purity of grains. It mainly includes two steps: (1) screening, which separates impurities according to size differences through a sieve; and (2) dust removal (air separation), which separates impurities according to aerodynamic characteristics (mainly specific gravity and suspension speed) using air flow. Screening and dust removal can obtain clean and high-grade grains, which are beneficial to safe storage, reduce subsequent processing loss, and meet food hygiene standards.

[0003] The existing dust removal device generally includes a dust removal box and a dust suction pump connected to the top of the dust removal box. After screening, grains can enter the interior of the dust removal box. The grains falling to the bottom of the dust removal box and being discharged through the discharge port at the bottom of the grains can be removed by the dust suction pump, thereby removing the impurities in the grains. However, the falling path of the grains in the dust removal box is short and fast, which results in insufficient effective air flow time. Therefore, it is difficult to completely remove the impurities in the grains by the dust suction pump. SUMMARY

[0004] The present application aims to overcome the above technical deficiencies and provide a multi-stage dust removal device in a grain screening process, which solves the technical problem that the dust removal device in the prior art can remove the impurities in the grains by the dust suction pump during the falling process, but the falling path of the grains in the dust removal box is short and fast, which makes it difficult to completely remove the impurities in the grains by the dust suction pump.

[0005] To achieve the above technical purposes, the technical scheme of the present application provides a multi-stage dust removal equipment in a grain screening process, which comprises a vibrating screen and a dust remover in communication with the output end of the vibrating screen, the dust remover comprises a dust removal box, the bottom of the dust removal box is provided with a discharge port, the side of the dust removal box is provided with a feeding port in communication with the output end of the vibrating screen, the top of the dust removal box is in communication with the air inlet of a dust suction pump, and a plurality of guide plates are sequentially and obliquely arranged in the dust removal box from top to bottom, the oblique directions of adjacent two guide plates are opposite, the screened grain of the vibrating screen can enter the dust removal box through the feeding port, and the grain entering the dust removal box sequentially passes through the plurality of guide plates and is discharged from the dust removal box through the discharge port, and each guide plate is provided below the lower end thereof with a group of gas nozzles, each group of gas nozzles comprises a plurality of gas nozzles arranged in a square shape at equal distances along the length of the guide plate, and the gas sprayed by the gas nozzles can blow away the impurities in the grain flowing down from the guide plate.

[0006] Further, the upper end of each guide plate is provided with a rotating shaft, and the two ends of each rotating shaft are rotatably installed at the two ends of the dust removal box through first bearings, so as to adjust the angle between the guide plate and the horizontal plane.

[0007] Further, the dust remover further comprises a driving mechanism, the driving mechanism comprises a plurality of first rotating rods, one end of each first rotating rod is connected with one end of a corresponding rotating shaft in the same direction, the other end of each first rotating rod is hingedly connected with one end of a corresponding hinged rod, the other end of each hinged rod is hingedly connected with a driving rod, and the driving rod is connected with a driving assembly for driving the up-and-down movement thereof.

[0008] Further, the gas nozzles in the same group are arranged at equal distances on a corresponding gas injection pipe, and the two ends of each gas injection pipe are rotatably installed at the two ends of the dust removal box through second bearings, so as to adjust the blowing direction of the gas nozzles.

[0009] Further, the driving mechanism further comprises a plurality of second rotating rods, one end of each second rotating rod is connected with one end of a corresponding gas injection pipe in the same direction, a strip-shaped movable hole is arranged on each second rotating rod, and a plurality of movable blocks slidingly arranged in the strip-shaped movable hole are arranged on the driving rod.

[0010] Further, a sliding rail is mounted on the driving rod along the length direction thereof, the sliding rail is slidingly arranged on a sliding block, and the sliding block is mounted at one end of the dust removal box.

[0011] Further, the driving assembly comprises a rack mounted on the driving rod along the length direction thereof, the rack is in meshing connection with a gear, and the gear is connected with the output shaft of a motor.

[0012] Further, the motor is a servo motor.

[0013] Further, the gas injection pipe is connected with the exhaust port of the gas pump through a pipeline.

[0014] Furthermore, the vibrating screen includes an inclined screening box, inside which a first screen and a second screen are arranged sequentially from top to bottom. A first impurity outlet is provided on one side of the screening box and at the lower end of the first screen, and a second impurity outlet is provided at the bottom of the lower end of the other side of the screening box. An outlet communicating with the feed inlet is provided at the lower end of the screening box and at the lower end of the second screen.

[0015] The beneficial effects of this invention include: 1. The dust collector is equipped with multiple guide plates arranged at an angle from top to bottom inside the dust collector. The angles of adjacent guide plates are opposite, which greatly extends the residence time and movement path of the grain in the dust collector. When the grain flows down from the bottom of the guide plate, it can form a uniform grain curtain, which disperses the grain. At this time, the gas nozzle blows air onto the grain flowing down from the bottom of the guide plate. The airflow can fully penetrate the grain curtain and come into contact with each grain, maximizing the effective area and achieving a better dust removal effect. 2. Each guide plate is equipped with a rotating shaft at the top. Each rotating shaft is rotatably installed at both ends of the dust collection box through the first bearing to adjust the angle between the guide plate and the horizontal plane. The angle between the guide plate and the horizontal plane is adjusted according to the type and amount of impurities in the grain, and appropriate adjustments are made between dust removal time and discharge speed to ensure sufficient dust removal and maximize the discharge speed. 3. The same group of gas nozzles are equidistantly arranged on a jet pipe. The jet pipe is connected to the exhaust port of the air pump through a pipe. Both ends of each jet pipe are rotatably installed at both ends of the dust collector box through a second bearing to adjust the blowing direction of the gas nozzles so that the blowing direction of the gas nozzles is as directly as possible to the grain curtain formed when the grain flows down from the lower end of the guide plate, thereby improving the dust removal effect on the grain. 4. When the drive rod moves up and down, it can drive the first rotating rod to rotate via the hinge rod, which in turn drives the rotating shaft to rotate, adjusting the angle between the guide plate and the horizontal plane. At the same time, the drive rod can drive the movable block to slide inside the strip-shaped movable hole, which in turn drives the second rotating rod to rotate. The second rotating rod can then drive the jet pipe to rotate, adjusting the blowing direction of the gas nozzle. This allows for simultaneous adjustment of the angle between the guide plate and the horizontal plane, as well as the blowing direction of the gas nozzle, without the need for separate adjustments, making the adjustment more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-stage dust removal device in the grain screening process according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a multi-stage dust removal device in the grain screening process according to an embodiment of the present invention; Figure 3 This is a partial structural diagram of a multi-stage dust removal device in the grain screening process according to an embodiment of the present invention. Figure 4 yesFigure 3 Another state diagram; Figure 5 yes Figure 3 Enlarged view of point A; In the diagram: 1. Vibrating screen; 11. Screening box; 111. First waste discharge port; 112. Second waste discharge port; 113. Discharge port; 12. First screen; 13. Second screen; 14. Feed hopper; 15. Vibrating motor; 2. Dust collector; 21. Dust collection box; 211. Discharge port; 212. Feed port; 22. Dust pump; 23. Guide plate; 24. Gas nozzle; 25. Rotating shaft; 26. Drive mechanism; 261. First rotating rod; 262. Hinge rod; 263. Drive rod; 2631. Movable block; 264. Drive assembly; 2641. Rack; 2642. Gear; 2643. Motor; 265. Second rotating rod; 2651. Strip-shaped movable hole; 266. Slide rail; 267. Slider. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] Example 1 This embodiment provides a multi-stage dust removal device for grain screening processes, such as... Figures 1-2As shown, the system includes a vibrating screen 1 and a dust collector 2 connected to the output end of the vibrating screen 1. The dust collector 2 includes a dust collection box 21, which is a rectangular hollow box. The bottom of the dust collection box 21 has a discharge port 211, and the upper side of the dust collection box 21 has a feed port 212 connected to the output end of the vibrating screen 1. The top of the dust collection box 21 is connected to the air inlet of the dust suction pump 22. Inside the dust collection box 21, multiple guide plates 23 are arranged inclined from top to bottom. The feed port 212 is located above the uppermost guide plate 23. The inclination directions of adjacent guide plates 23 are opposite, which greatly extends the residence time and movement path of the grain in the dust collection box 2. The grain screened by the vibrating screen 1 can enter the dust collection box 21 through the feed port 212. Grain entering the dust collector 21 passes through multiple guide plates 23 and is discharged from the dust collector 21 through the discharge port 211. Each guide plate 23 has a set of gas nozzles 24 at its lower end. Each set of gas nozzles 24 includes multiple gas nozzles 24 arranged at equal intervals along the length of the guide plate 23. When the grain flows down from the lower end of the guide plate 23, it can form a uniform grain curtain, making the grain dispersed. At this time, the gas nozzles 24 blow air onto the grain flowing down from the lower end of the guide plate 23. The airflow can fully penetrate the grain curtain and come into contact with each grain, maximizing the effective area and achieving a better dust removal effect. At the same time, the energy loss during dust removal is small. Impurities in the grain can be removed with relatively low air pressure and air volume, reducing energy consumption.

[0019] It should be noted that the vibrating screen 1 includes an inclined screening box 11. A feed hopper 14 is located at the top of the screening box 11, through which grain enters the screening box 11. A vibration motor 15 is installed on the side wall of the screening box 11, causing the screening box 11 to vibrate and screen the grain. Inside the screening box 11, from top to bottom, are arranged a first screen 12 and a second screen 13. A first impurity outlet 111 is located on one side of the screening box 11 below the first screen 12, and a second impurity outlet 112 is located at the bottom of the lower end of the other side of the screening box 11. The lower end of the screen 13 is provided with a discharge port 113 that communicates with the feed inlet 212. After the grain is screened by the first screen 12, larger impurities in the grain will remain on the first screen 12 and be discharged from the inside of the screening box 11 through the first row of impurity outlets 111. Fine sand and other impurities in the grain can pass through the second screen 13 and fall into the bottom of the screening box 11, and be discharged from the inside of the screening box 11 through the second row of impurity outlets 112. At the same time, the screened grain will remain on the second screen 13. The grain on the second screen 13 can be discharged from the inside of the screening box through the discharge port 113 and enter the dust collection box 21 through the feed inlet 212.

[0020] Example 2 This embodiment provides a multi-stage dust removal device for grain screening. Based on embodiment 1, in this embodiment, each guide plate 23 is equipped with a rotating shaft 25 at its upper end. Both ends of each rotating shaft 25 are rotatably mounted on both ends of the dust collection box 21 through a first bearing to adjust the angle between the guide plate 23 and the horizontal plane. The angle between the guide plate 23 and the horizontal plane is adjusted according to the type and amount of impurities in the grain, and appropriate adjustments are made between dust removal time and discharge speed to ensure sufficient dust removal and maximize the discharge speed. At the same time, different types of grains have significant differences in particle size, specific gravity, surface friction coefficient and flowability. By adjusting the angle of the guide plate 23, the most suitable downward slope can be set for each type of grain to ensure that all materials can form an ideal material curtain, thereby ensuring a high-efficiency dust removal effect. Moist grains have poor flowability and are prone to clumping, requiring a gentler angle to increase dispersion time. Dry grains have good flowability and can use a steeper angle to improve processing efficiency. This allows the same equipment to efficiently process different types and moisture levels of grains, greatly expanding the applicability of the equipment.

[0021] In this embodiment, as Figures 3-4 As shown, the dust collector 2 also includes a drive mechanism 26, which includes multiple first rotating rods 261. One end of each first rotating rod 261 is connected to one end of multiple rotating shafts 25 in the same direction. The other end of each first rotating rod 261 is hinged to one end of multiple hinge rods 262. The other end of each hinge rod 262 is hinged to a drive rod 263. The drive rod 263 is connected to a drive assembly 264 for driving its up and down movement. The drive assembly 264 can drive the drive rod 263 to move up and down. The drive rod 263 can drive the first rotating rods 261 to rotate through the hinge rods 262, thereby driving the rotating shafts 25 to rotate and adjusting the angle between the guide plate 23 and the horizontal plane. At the same time, a slide rail 266 is installed on the drive rod 263 along its length. The slide rail 266 is slidably mounted on a slider 267. The slider 267 is installed at one end of the dust collector box 21. The cooperation between the slide rail 266 and the slider 267 allows the drive rod 263 to move up and down stably.

[0022] In this embodiment, the drive assembly 264 includes a rack 2641 mounted on the drive rod 263 along its length. The rack 2641 meshes with a gear 2642, which is connected to the output shaft of the motor 2643. The motor 2643 is a servo motor, which can drive the gear 2641 to rotate. The gear 2641 can drive the drive rod 263 to move up and down through the rack 2641. As for the drive assembly 264, it only needs to be able to drive the drive rod 263 to move up and down. Therefore, it is not limited to adopting a specific structure. For example, in some other embodiments, the drive assembly 264 adopts a cylinder or hydraulic rod or other drive component that can drive the drive rod 263 to move up and down.

[0023] Example 3 This embodiment provides a multi-stage dust removal device for grain screening. Based on embodiment 2, the same group of gas nozzles 24 are equidistantly arranged on a jet pipe 27. The jet pipe 27 is connected to the exhaust port of the air pump through a pipe. The gas generated by the air pump can enter the jet pipe 27 through the pipe. The gas inside the jet pipe 27 can be ejected from the inside of the jet pipe 27 through the gas nozzles 24. Both ends of each jet pipe 27 are rotatably mounted at both ends of the dust collection box 21 through a second bearing to adjust the blowing direction of the gas nozzles 24, so that the blowing direction of the gas nozzles 24 is as directly as possible to the grain curtain formed when the grain flows down from the lower end of the guide plate 23, thereby improving the dust removal effect on the grain.

[0024] It should be noted that when the blowing direction of the gas nozzle 24 is directly opposite the grain curtain formed when the grain flows down from the lower end of the guide plate 23, the air kinetic energy is fully used to peel off impurities, with no lateral force loss, resulting in the highest impact efficiency. The vertical airflow can penetrate the entire thickness of the material curtain, thoroughly removing the dust inside and eliminating dust removal dead corners, thus achieving the best dust removal effect. At the same time, it is difficult to adjust the blowing direction of the gas nozzle 24 to be directly opposite the grain curtain formed when the grain flows down from the lower end of the guide plate 23. Therefore, the blowing direction of the gas nozzle 24 can only be adjusted as much as possible to be directly opposite the grain curtain formed when the grain flows down from the lower end of the guide plate 23.

[0025] In this embodiment, as Figure 5 As shown, the drive mechanism 26 also includes multiple second rotating rods 265. One end of each second rotating rod 265 is connected to one end of each jet pipe 27 in the same direction. Each second rotating rod 265 is provided with a strip-shaped movable hole 2651. The drive rod 263 is provided with multiple movable blocks 2631 that slide inside the strip-shaped movable holes 2651. When the drive rod 263 moves up and down, the drive rod 263 can drive the movable blocks 2631 to slide inside the strip-shaped movable holes 2651, thereby driving the second rotating rod 265 to rotate. At the same time, the second rotating rod 265 can drive the jet pipe 27 to rotate, thereby adjusting the blowing direction of the gas nozzle 24. This allows the blowing direction of the gas nozzle 24 to be adjusted simultaneously with the angle between the guide plate 23 and the horizontal plane, without the need for separate adjustments, making the adjustment more convenient.

[0026] It should be noted that when the drive rod 263 moves up and down, it can drive the first rotating rod 261 via the hinge rod 262, thereby rotating the rotating shaft 25 to adjust the angle between the guide plate 23 and the horizontal plane. Simultaneously, the drive rod 263 can drive the movable block 2631 to slide inside the strip-shaped movable hole 2651, thereby rotating the second rotating rod 265. The second rotating rod 265 can then drive the jet pipe 27 to rotate, adjusting the blowing direction of the gas nozzle 24. This linkage mechanism, after adjusting the angle of the guide plate 23, ensures that the gas nozzle 24 blows... After synchronous adjustment, the direction should be aligned as directly as possible with the grain curtain formed when the grain flows down from the lower end of the guide plate 23. Therefore, the shape of the strip-shaped movable hole 2651 needs to be designed. Optionally, the strip-shaped movable hole 2651 can be designed as a straight line, or as an arc, or even other irregular shapes. All shapes of the strip-shaped movable hole 2651 that ensure the blowing direction of the gas nozzle 24 is aligned as directly as possible with the grain curtain formed when the grain flows down from the lower end of the guide plate 23 after synchronous adjustment are within the protection scope of this invention.

[0027] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-stage dust removal device for grain screening, comprising a vibrating screen (1) and a dust collector (2) connected to the output end of the vibrating screen (1), wherein the dust collector (2) comprises a dust collection box (21), the bottom of the dust collection box (21) is provided with a discharge port (211), the upper side of the dust collection box (21) is provided with a feed port (212) connected to the output end of the vibrating screen (1), and the top of the dust collection box (21) is connected to the air inlet of a dust suction pump (22), characterized in that, The dust removal box (21) is internally sequentially inclined from top to bottom with multiple guide plates (23), the inclination directions of the adjacent two guide plates (23) are opposite, the screened grain of the vibrating screen (1) can enter the dust removal box (21) through the feeding port (212), the grain entering the dust removal box (21) sequentially passes through the multiple guide plates (23) and is discharged from the dust removal box (21) through the discharge port (211), the lower end of each guide plate (2) is provided with a group of gas nozzles (24), each group of gas nozzles (24) comprises multiple gas nozzles (24) which are equidistantly arranged along the length direction of the guide plate (23), and the gas sprayed by the gas nozzle (24) can blow away the impurities in the grain flowing down from the guide plate (23).

2. The multi-stage dust extraction apparatus in a grain screening process according to claim 1, characterized in that, The upper end of each guide plate (23) is provided with a rotating shaft (25), and the two ends of each rotating shaft (25) are rotatably installed in the two ends of the dust removal box (21) through first bearings, so as to adjust the angle between the guide plate (23) and the horizontal plane.

3. The multi-stage dust extraction apparatus in a grain screening process according to claim 2, characterized in that, The dust remover (2) further comprises a driving mechanism (26), the driving mechanism (26) comprises multiple first rotating rods (261), one end of each first rotating rod (261) is connected with the same end of a rotating shaft (25) in the same direction, the other end of each first rotating rod (261) is hingedly connected with one end of a hinged rod (262), the other end of each hinged rod (262) is hingedly connected with a driving rod (263), and the driving rod (263) is connected with a driving assembly (264) for driving the up-down movement thereof.

4. The multi-stage dust extraction apparatus in a grain screening process according to claim 3, characterized in that, The same group of gas nozzles (24) are equidistantly arranged on a gas injection pipe (27), and the two ends of each gas injection pipe (27) are rotatably installed in the two ends of the dust removal box (21) through second bearings, so as to adjust the blowing direction of the gas nozzle (24).

5. The multi-stage dust extraction apparatus in a grain screening process according to claim 4, characterized in that, The driving mechanism (26) further comprises multiple second rotating rods (265), one end of each second rotating rod (265) is connected with the same end of a gas injection pipe (27) in the same direction, a strip-shaped movable hole (2651) is arranged on each second rotating rod (265), and a plurality of movable blocks (2631) which are slidingly arranged in the strip-shaped movable hole (2651) are arranged on the driving rod (263).

6. The multi-stage dust extraction apparatus in a grain screening process according to claim 5, characterized in that, The driving rod (263) is provided with a sliding rail (266) along the length direction thereof, the sliding rail (266) is slidingly arranged on a sliding block (267), and the sliding block (267) is installed at one end of the dust removal box (21).

7. The multi-stage dust extraction apparatus in a grain screening process according to claim 6, characterized in that, The driving assembly (264) comprises a rack (2641) which is installed on the driving rod (263) along the length direction of the driving rod (263), the rack (2641) is meshed with a gear (2642), and the gear (2642) is connected with the output shaft of a motor (2643).

8. The multi-stage dust extraction apparatus in a grain screening process according to claim 7, characterized in that, The motor (2643) is a servo motor.

9. The multi-stage dust extraction apparatus in a grain screening process according to claim 8, characterized in that, The gas injection pipe (27) is connected with the exhaust port of the gas pump through a pipeline.

10. The multi-stage dust extraction apparatus in a grain screening process according to claim 1, wherein, The vibrating screen (1) comprises a screening box (11) arranged obliquely, a first screen (12) and a second screen (13) are sequentially arranged inside the screening box (11) from top to bottom, a first impurity discharging port (111) is arranged at one side of the screening box (11) and located at the lower end of the first screen (12), a second impurity discharging port (112) is arranged at the lower end of the other side of the screening box (11), and a discharge port (113) in communication with the feeding port (212) is arranged at the lower end of the screening box (1) and located at the lower end of the second screen (13).

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