A rice multi-stage air separation device

Abstract

The present invention provides a multi-stage air separation device for rice, which belongs to the technical field of grain processing. It includes a material tower and a plurality of sorting units longitudinally distributed in the material tower. The sorting unit includes a conical rotating body, a chip feed chamber is provided in the rotating body, and a plurality of inclined baffles extending beyond the outer wall of the rotating body are evenly arranged on the wall of the rotating body in a circumferential direction. A strip-shaped feed trough is provided at the connection position between the inclined baffle and the outer wall of the rotating body. A wind-passing zone is formed between the side of the inclined baffle away from the outer wall of the rotating body and the outer wall of the rotating body. The feed trough is located on the inner side of the inclined baffle. The rotating body is rotatably connected to the material tower. The rotating body is driven by a driving unit to rotate in the opposite direction of the tilt direction of the inclined baffle. The sorting units are arranged in sequence along the axis of the material tower. An extraction pipe connected to the chip feed chamber is rotatably connected to the rotating body, and the extraction pipe is connected to a negative pressure source. The present invention has the advantages of high efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of rice processing and relates to a multi-stage air separation device for rice. Background Art

[0002] Traditional rice air separators use the different resistance caused by airflow to passing materials of different densities to achieve separation and classification. The fixed landing point has a strong correlation with factors such as airflow intensity and material feeding speed, resulting in low sorting accuracy and difficulty in increasing the material feeding speed. In addition, in order to further improve the sorting accuracy, the grain needs to be passed through the air, or multiple sorting units need to be set in series. Regardless of the method, the grain needs to be collected again and put in again, which requires high work intensity and processing cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-stage air separation device for rice in view of the above-mentioned problems existing in the existing technology. The technical problem to be solved by the present invention is how to improve the sorting efficiency.

[0004] The purpose of the present invention can be achieved through the following technical solutions: a multi-stage air separation device for rice, characterized in that it includes a material tower and a plurality of sorting units longitudinally distributed in the material tower, the sorting unit includes a conical rotating body, the rotating body has a chip feeding chamber, the wall surface of the rotating body is evenly provided with a plurality of inclined baffles extending beyond the outer wall surface of the rotating body, the connecting position of the inclined baffle and the outer wall surface of the rotating body is provided with a strip-shaped feeding trough, the side of the inclined baffle away from the outer wall surface of the rotating body is connected to the outer wall surface of the rotating body A wind-passing area is formed between the surfaces, the feed trough is located on the inner side of the inclined baffle, the rotating body is rotatably connected in the material tower, the rotating body is driven by a driving unit to rotate in the opposite direction of the inclined direction of the inclined baffle, the small diameter end of the rotating body is facing upward, and a guide hopper located at the small diameter end of the rotating body is fixedly provided on the material tower, and a material discharge gap is provided between the guide hopper and the outer wall of the rotating body, and each sorting unit is arranged in sequence along the axis direction of the material tower, and an extraction pipe connected to the chip feeding chamber is rotatably connected to the rotating body, and the extraction pipe is connected to a negative pressure source.

[0005] Furthermore, a chip storage box is fixedly provided outside the material tower, each chip feed pipe is connected to the chip storage box, and the top of the chip storage box is connected to a negative pressure source.

[0006] Furthermore, a discharge contraction portion is provided at the bottom of the material tower.

[0007] Furthermore, the rotation speed of each rotating body decreases from top to bottom.

[0008] Furthermore, the driving unit includes a motor, a pulley 1 corresponding to each rotating body is fixedly provided on the output shaft of the motor, a pulley 2 is fixedly provided on the rotating body, and each pulley 1 is connected to the corresponding pulley 2 through a transmission belt.

[0009] Furthermore, the rotating body is a rubber piece, and the inner wall of the material tower has a rubber buffer layer.

[0010] Since the rotating body is in a uniform rotation state and the direction of its inclined baffle is opposite to the rotation direction of the rotating body, the inclined baffle can drive the grains away from the outer wall of the rotating body. The outer wall of the rotating body is a cone with the smaller end facing upward. The grains tend to stick to the outer wall of the rotating body during the falling process, so that most of the grains move between the inner wall of the material tower and the outer wall of the rotating body. This movement has a certain degree of randomness. Some grains are hit by the inclined baffle and some grains continue to move downward. However, this will not cause the grains to enter the chip feeding chamber under non-negative pressure. This is because the entrance of the chip feeding chamber is blocked by the inclined baffle. However, in this process, the grains will pass through the wind zone at a high frequency. Under the action of the negative pressure in the chip feeding chamber, the unfull grains with lower density and the light impurities in the grains will enter the chip feeding chamber.

[0011] From top to bottom, the rotation speed of each rotating body slows down successively. This is because the faster the rotation speed of the rotating body, the more difficult it is to enter the chip feed chamber, or the density of the grain that can enter the chip feed chamber is smaller. By gradually reducing the rotation speed of the longitudinally distributed rotating body, the impurities and incomplete particles in the grain can be sorted in batches, and under the same negative pressure, the rejected materials in the grain can be collected into the chip storage box step by step and in small quantities multiple times.

[0012] By setting up multiple sorting units vertically, multi-level sorting of grains can be completed at one time, and the grains can be directly unloaded from the top of the material tower. The unloading speed can also be greatly improved. This is because the sorting method in this scheme does not rely entirely on airflow, but is combined with interference with the grain movement path to slow down its falling speed and cause collisions, thereby increasing the frequency of grain sorting and extending the path. Therefore, the unloading speed can be increased and the sorting efficiency can be improved.

[0013] In addition, this solution is not the traditional blast-type air separation, but the negative pressure air separation. The negative pressure suction method can reduce dust and improve the accuracy of the airflow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of this air separation device.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of a rotating body.

[0016] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0017] Figure 4 It is a cross-sectional view of the rotating body (the rotating body is cut horizontally when the rotating body is viewed from above).

[0018] In the figure, 1. material tower; 11. discharge contraction part; 2. sorting unit; 21. rotating body; 22. chip feeding chamber; 23. inclined baffle; 24. feed chute; 25. air flow area; 26. extraction pipe; 27. chip storage box; 28. guide hopper; 31. motor; 32. pulley 1; 33. pulley 2. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1-Figure 4 The multi-stage air separation device for rice shown in the figure includes a material tower 1 and a plurality of sorting units 2 longitudinally distributed in the material tower 1. The sorting unit 2 includes a conical rotating body 21, and a chip feeding chamber 22 is provided in the rotating body 21. A plurality of inclined baffles 23 extending beyond the outer wall of the rotating body 21 are evenly arranged on the wall surface of the rotating body 21 in a circumferential direction. A strip-shaped feed trough 24 is provided at the connection position between the inclined baffle 23 and the outer wall of the rotating body 21. A wind passing area 25 is formed between the side of the inclined baffle 23 away from the outer wall of the rotating body 21 and the outer wall of the rotating body 21. The feed trough 24 is located on the inner side of the inclined baffle 23, and the rotating body 21 is rotatably connected to the material tower 1. The rotating body 21 is driven by a driving unit to rotate in the opposite direction of the inclined direction of the inclined baffle 23. The small diameter end of the rotating body 21 faces upward, and a guide hopper 28 is fixedly provided on the material tower 1 at the small diameter end of the rotating body 21. There is a material discharge gap between the guide hopper 28 and the outer wall of the rotating body 21. Each sorting unit 2 is arranged in sequence along the axial direction of the material tower 1. The rotating body 21 is rotatably connected to an extraction pipe 26 that communicates with the chip feed chamber 22, and the extraction pipe 26 is connected to a negative pressure source.

[0021] A chip storage box 27 is fixedly provided outside the material tower 1. Each chip feed pipe is connected to the chip storage box 27. The top of the chip storage box 27 is connected to a negative pressure source to centrally collect chips and non-full grains. This can reduce the difficulty of chip collection, improve the uniformity of negative pressure and the difficulty of controlling negative pressure. In addition, it is also a way to save costs.

[0022] A discharge contraction portion 11 is provided at the bottom of the material tower 1 , and full grains are discharged and collected from the discharge contraction portion 11 .

[0023] The drive unit includes a motor 31. A pulley 32, corresponding to each rotating body 21, is fixedly mounted on the output shaft of motor 31. A pulley 33 is fixedly mounted on rotating body 21. Each pulley 32 is connected to its corresponding pulley 33 via a transmission belt. The larger the diameter of pulley 32, the faster the corresponding rotating body 21 rotates. Therefore, the diameter of each pulley 32 decreases from top to bottom.

[0024] The rotating body 21 is a rubber member, and the inner wall of the silo 1 has a rubber buffer layer. On the one hand, it prevents damage to the grain, and on the other hand, it reduces the intensity of grain splashing. Under the eddy current and spiral impact path, the grain is almost unable to enter the interior of the rotating body 21 under the action of the impact force.

[0025] Since the rotating body 21 is in a uniform rotating state and the direction of its inclined baffle 23 is opposite to the rotation direction of the rotating body 21, the inclined baffle 23 can drive the grains away from the outer wall of the rotating body 21, and the outer wall of the rotating body 21 is a cone with the smaller end facing upward. During the falling process, the grains tend to stick to the outer wall of the rotating body 21, so that most of the grains move between the inner wall of the material tower 1 and the outer wall of the rotating body 21. This movement has a certain degree of randomness. Some grains are hit by the inclined baffle 23, and some grains continue to move downward. However, this will not cause the grains to enter the chip feeding chamber 22 under the action of non-negative pressure. This is because the entrance of the chip feeding chamber 22, that is, the obstruction of the inclined baffle 23. However, in this process, the grains will pass through the wind zone 25 at a high frequency. Under the action of the negative pressure in the chip feeding chamber 22, the unfull grains with lower density and the light impurities in the grains will enter the chip feeding chamber 22.

[0026] From top to bottom, the rotation speed of each rotating body 21 slows down successively. This is because the faster the rotation speed of the rotating body 21, the more difficult it is to enter the chip feeding chamber 22, or the density of the grains that can enter the chip feeding chamber 22 is smaller. By gradually reducing the rotation speed of the longitudinally distributed rotating body 21, impurities and incomplete grains in the grains can be sorted in batches, and under the same negative pressure, the rejected materials in the grains can be collected gradually and in small quantities into the chip storage box 27 multiple times.

[0027] By arranging multiple sorting units 2 longitudinally, multi-level sorting of grains can be completed at one time, and the grains can be directly discharged from the top of the material tower 1. The discharge speed can also be greatly improved. Because the sorting method in this scheme does not rely entirely on airflow, but is combined with interference with the movement path of the grains, the falling speed is slowed down and collisions occur, which increases the frequency of grain sorting and extends the path. Therefore, the discharge speed can be increased and the sorting efficiency can be improved.

[0028] In addition, this solution is not the traditional blast-type air separation, but the negative pressure air separation. The negative pressure suction method can reduce dust and improve the accuracy of the airflow path.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A multi-stage air separation device for rice, characterized in that: The invention comprises a material tower (1) and a plurality of sorting units (2) longitudinally distributed in the material tower (1), wherein the sorting unit (2) comprises a conical rotating body (21), wherein the rotating body (21) has a chip feeding chamber (22), and the wall surface of the rotating body (21) is evenly provided with a plurality of inclined baffles (23) extending beyond the outer wall surface of the rotating body (21) in the circumferential direction, wherein a strip-shaped feeding trough (24) is provided at the connection position between the inclined baffles (23) and the outer wall surface of the rotating body (21), and a wind-passing area (25) is formed between the side of the inclined baffle (23) away from the outer wall surface of the rotating body (21) and the outer wall surface of the rotating body (21), and the feeding trough (24) is located at the outer wall surface of the rotating body (21). On the inner side of the inclined baffle (23), the rotating body (21) is rotatably connected in the material tower (1). The rotating body (21) is driven by a driving unit to rotate in the opposite direction of the inclined direction of the inclined baffle (23). The small diameter end of the rotating body (21) faces upward. A guide hopper (28) located at the small diameter end of the rotating body (21) is fixedly provided on the material tower (1). There is a material discharge gap between the guide hopper (28) and the outer wall surface of the rotating body (21). Each sorting unit (2) is arranged in sequence along the axial direction of the material tower (1). An extraction pipe (26) communicating with the chip feeding chamber (22) is rotatably connected to the rotating body (21), and the extraction pipe (26) is connected to a negative pressure source.

2. A rice multi-stage air separation device according to claim 1, characterized in that: A chip storage box (27) is fixedly provided outside the material tower (1), each chip feeding pipe is connected to the chip storage box (27), and the top of the chip storage box (27) is connected to a negative pressure source.

3. A rice multi-stage air separation device according to claim 2, characterized in that: The bottom of the material tower (1) is provided with a discharge constriction portion (11).

4. A rice multi-stage air separation device according to claim 1, 2 or 3, characterized in that: The rotation speed of each rotating body (21) decreases from top to bottom.

5. A rice multi-stage air separation device according to claim 1, 2 or 3, characterized in that: The driving unit comprises a motor (31), a pulley 1 (32) corresponding to each rotating body (21) is fixedly provided on the output shaft of the motor (31), a pulley 2 (33) is fixedly provided on the rotating body (21), and each pulley 1 (32) is connected to the corresponding pulley 2 (33) via a transmission belt.

6. A rice multi-stage air separation device according to claim 1, 2 or 3, characterized in that: The rotating body (21) is a rubber piece, and the inner wall of the material tower (1) has a rubber buffer layer.

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