Efficient grain cleaning device

Abstract

An efficient grain cleaning device belongs to the technical field of screening devices and is characterized in that an upper screen driving rod and an upper screen fixing rod are driven by a motor a, a bearing is matched to drive an upper screen to rotate around a rotating shaft which bypasses the centroid but does not coincide with the axis of the upper screen, and materials are preliminarily screened and uniformly spread on a lower screen; a motor b drives an air outlet pipe and a lower screen driving rod to be matched with a positioning air guide pipe to drive a lower screen to move up and down along the axis and swing left and right around the axis, the lower screen moves up and down along the axis to throw up materials, and the materials are layered according to different physical properties of grains and impurities. The lower screen body swings leftwards and rightwards around the axis to prevent materials on the lower screen body from being accumulated, and the lower screen body swings leftwards and rightwards around the axis to prevent the materials on the lower screen body from being accumulated. According to the device, the dispersity of materials on the sieve can be effectively improved when the feeding amount of the materials is large, and then the cleaning efficiency and the cleaning quality are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high-efficiency cleaning device of grain, belong to screening device technical field. BACKGROUND

[0002] Separately harvesting is an important form of grain harvesting in China at present, with the advantages of simple operation, less machine investment and low technical requirements. The operation quality of the cleaning process directly affects the impurity content and loss rate of grain, and further affects the quality of grain and the income of farmers. In recent years, with the continuous increase of grain yield, the requirement for the operation efficiency of cleaning device also increases. Traditional grain cleaning devices are mostly flat reciprocating vibrating screens. Due to the single movement form of the screen surface, when the material feeding amount increases, the material is difficult to disperse quickly on the screen surface and is easy to form accumulation, resulting in a decrease in cleaning efficiency. At the same time, the accumulation of material also causes insufficient contact with the screen surface, so that part of the grain cannot complete the screening and is removed together with the residues, causing entrainment loss and economic loss to farmers. SUMMARY

[0003] The purpose of the present application is to provide a high-efficiency cleaning device for grain. The upper screen driving rod and the upper screen fixing rod are driven by motor a, and the upper screen is driven to rotate around the axis of inertia but not coinciding with the axis by the cooperation of the bearing, so as to preliminarily screen the material and uniformly spread it on the lower screen. The air outlet pipe and the lower screen driving rod are driven by motor b, and the lower screen is driven to move up and down along the axis and swing left and right around the axis by the cooperation of the positioning air guide pipe, so as to realize high-quality and high-efficiency cleaning of grain by the airflow input by the air pipe.

[0004] The purpose of the present application can be achieved by the following scheme: a high-efficiency cleaning device for grain, comprising a feeding hopper, a housing, an upper screen, an air outlet pipe, a lower screen, a lower screen driving rod, a positioning air guide pipe, a discharge hopper, a motor a housing, a motor a, an upper screen driving rod, an upper screen fixing rod, a bearing, a belt, a lower screen fixing seat, a motor b, a motor b housing, and an air pipe, characterized in that the housing is provided with square openings around it, the feeding hopper, the motor a and the motor a housing are fixed on the housing, the upper screen driving rod is in the shape of "z", the upper screen driving rod is fixed on the power output shaft of the motor a, the upper screen fixing rod is rotatably installed on the upper screen driving rod, four bearings are fixed together to form a rectangle, two of the bearings are rotatably installed on the motor a housing, the other two bearings are rotatably installed on the upper screen fixing rod, the upper screen is fixed on the upper screen fixing rod, the diameter of the screen holes of the upper screen is larger than that of the lower screen, and the diameter of the screen surface of the upper screen is the same as that of the lower screen. The air outlet pipe is fixed on the lower screen, the air outlet pipe is sleeved on the positioning air guide pipe, the lower screen driving rod is connected to the air outlet pipe through a ball hinge, the lower screen fixing seat and the discharge hopper are fixed on the housing, the motor b and the motor b housing are fixed on the lower screen fixing seat, the lower screen driving rod is rotatably installed on the lower screen fixing seat, the power output shaft of the motor b is connected to the lower screen driving rod through a belt, and the air pipe is sleeved on the positioning air guide pipe.

[0005] The beneficial effects of the present application are: the material is preliminarily screened by the upper sieve rotating around the rotation axis which does not coincide with the centroid of the upper sieve, and is uniformly spread on the lower sieve; the dispersion of the material on the sieve is further improved by the left and right swing of the lower sieve around the axis, so as to prevent the material from piling up; the material is thrown up by the up and down movement of the lower sieve along the axis, and is layered by the different physical properties between the grain and the chaff; the chaff is blown out from the square opening around the housing by the air flow blown out by the air pipe, and the grain falls back to the sieve and is sieved in the process, and then enters the grain collecting device through the discharge hopper to complete the cleaning, which can effectively improve the dispersion of the material on the sieve when the feeding amount is large, and further ensure the cleaning efficiency and quality. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 is the front view of the present application.

[0007] Figure 2 is Figure 1 is the sectional view of the feeding hopper, the housing, the discharge hopper, the motor a shield, and the motor b shield along the A-A direction.

[0008] Figure 3 is Figure 1 is the top view of the present application.

[0009] Figure 4 is Figure 1 is the structural schematic view of the partial housing, the motor a shield, the motor a, the upper sieve driving rod, the upper sieve fixing rod, the bearing, and the upper sieve.

[0010] Figure 5 is Figure 1 is the structural schematic view of the air pipe, the lower sieve, the lower sieve driving rod, the positioning air guide pipe, the belt, the lower sieve fixing seat, the motor b, and the motor b shield.

[0011] Explanation of part numbers in the figure: 1 feeding hopper, 2 housing, 3 upper sieve, 4 air pipe, 5 lower sieve, 6 lower sieve driving rod, 7 positioning air guide pipe, 8 discharge hopper, 9 motor a shield, 10 motor a, 11 upper sieve driving rod, 12 upper sieve fixing rod, 13 bearing, 14 belt, 15 lower sieve fixing seat, 16 motor b, 17 motor b shield, 18 air pipe. DETAILED DESCRIPTION

[0012] The application is further illustrated below with reference to the accompanying drawings and examples. A high-efficiency grain cleaning device comprises a feeding hopper 1, a housing 2, an upper sieve 3, an air outlet pipe 4, a lower sieve 5, a lower sieve driving rod 6, a positioning air guide pipe 7, a discharge hopper 8, a motor a housing 9, a motor a 10, an upper sieve driving rod 11, an upper sieve fixing rod 12, bearings 13, a belt 14, a lower sieve fixing seat 15, a motor b 16, a motor b housing 17, and an air pipe 18. The housing 2 is provided with square openings around the periphery, the feeding hopper 1, the motor a 10, and the motor a housing 9 are fixed to the housing 2, the upper sieve driving rod 11 is in the shape of a "z" letter, the upper sieve driving rod 11 is fixed to the power output shaft of the motor a 10, the upper sieve fixing rod 12 is rotatably installed on the upper sieve driving rod 11, the four bearings 13 are fixed together to form a rectangle, two of the bearings 13 are rotatably installed on the motor a housing 9, and the other two bearings 13 are rotatably installed on the upper sieve fixing rod 12, the upper sieve 3 is fixed to the upper sieve fixing rod 12, the sieve hole diameter of the upper sieve 3 is larger than that of the lower sieve 5, and the sieve surface diameter of the upper sieve 3 is the same as that of the lower sieve 5. The air outlet pipe 4 is fixed to the lower sieve 5, the air outlet pipe 4 is sleeved on the positioning air guide pipe 7, the lower sieve driving rod 6 is connected to the air outlet pipe 4 through a ball hinge, the lower sieve fixing seat 15 and the discharge hopper 8 are fixed to the housing 2, the motor b 16 and the motor b housing 17 are fixed to the lower sieve fixing seat 15, the lower sieve driving rod 6 is rotatably installed on the lower sieve fixing seat 15, the power output shaft of the motor b 16 is connected to the lower sieve driving rod 6 through the belt 14, and the air pipe 18 is sleeved on the positioning air guide pipe 7.

[0013] When the device is started, the motor a 10 and the motor b 16 start to rotate, the motor a 10 drives the upper sieve driving rod 11 to rotate, the upper sieve driving rod 11 drives the upper sieve fixing rod 12 to rotate around the axis of the power output shaft of the motor a 10 under the limitation of the four bearings 13, the side of the upper sieve fixing rod 12 connected to the upper sieve driving rod 11 has a larger rotary radius, and the side connected to the upper sieve 3 has a smaller rotary radius, since the axis of the upper sieve 3 coincides with that of the upper sieve fixing rod 12 when they are fixed, the upper sieve 3 will rotate around the rotary axis which does not coincide with its axis under the drive of the upper sieve fixing rod 12; the motor b 16 drives the lower sieve driving rod 6 to rotate through the belt 14, the lower sieve driving rod 6 transmits power to the air outlet pipe 4 through the ball hinge to drive the air outlet pipe 4 and the lower sieve 5 fixed thereto, so that the lower sieve 5 simultaneously produces reciprocating motion along the axis of the positioning air guide pipe 7 and oscillation around the axis of the positioning air guide pipe 7.

[0014] The material to be screened enters the cleaning device through the feeding hopper 1 and first contacts the upper screen 3. Under the action of the upper screen 3, the material to be screened is periodically and uniformly scattered in all directions and passes through the screen holes of the upper screen 3 or falls along the edge of the upper screen 3 and drops on the lower screen 5. Since the screen hole diameter of the upper screen 3 is larger than that of the lower screen 5, the material to be screened will pass through the screen more quickly. At the same time, since the screen surface diameter of the upper screen 3 is the same as that of the lower screen 5, the inclination generated by the upper screen 3 during rotation causes the material to be screened that falls along the edge to fall within the screen surface range of the lower screen 5. The air flow passes through the external fan (not shown in the figure) through the air pipe 18 and the positioning air guide pipe 7 and finally blows out from the openings around the air outlet pipe 4. The impurities mixed in the grain during the process of falling from the upper screen 3 to the lower screen 5 will be blown out from the square openings around the housing 2 by the air flow to complete the preliminary cleaning. When the material is uniformly distributed on the lower screen 5 by the action of the upper screen 3, part of the grain directly passes through the screen and falls into the subsequent grain collecting device through the discharge hopper 8. The reciprocating movement of the lower screen 5 along the axis of the positioning air guide pipe 7 will cause the material that has not passed through the screen to be thrown up. Part of the impurities that have not been completely removed in the preliminary cleaning process will be blown out of the cleaning device again by the action of the air flow, and the remaining grain will again contact the lower screen 5 and part of it will pass through the screen. The swinging of the lower screen 5 around the axis of the positioning air guide pipe 7 will cause the material to be scattered on the lower screen 5 to be shaken. During the cleaning process, the material is continuously fed from the feeding hopper 1, and the cleaning device realizes uniform dispersion and high-quality and efficient cleaning of the material to be screened under the condition of large feeding amount through the continuous circulation of the above process.

[0015] The grain high-efficiency cleaning device designed by the application has the advantages of simple and reasonable structure, high cleaning efficiency and good quality, and is especially suitable for the cleaning of grain under the condition of large feeding amount.

Claims

1. A kind of grain high-efficiency cleaning device, including feed hopper (1), shell (2), upper sieve (3), air outlet pipe (4), lower sieve (5), lower sieve drive rod (6), positioning air duct (7), discharge hopper (8), motor a protective cover (9), motor a (10), upper sieve drive rod (11), upper sieve fixed rod (12), bearing (13), belt (14), lower sieve fixed seat (15), motor b (16), motor b protective cover (17), air pipe (18) its characterized in that The shell (2) is provided with a square opening around, the feeding hopper (1), motor a (10), motor a shield (9) is fixed on the shell (2), the upper screen drive rod (11) is in the shape of "z", the upper screen drive rod (11) is fixed on the power output shaft of motor a (10), the upper screen fixed rod (12) is rotatably installed on the upper screen drive rod (11), four bearings (13) are fixed together to form a rectangle, two bearings (13) are rotatably installed on the motor a shield (9), the other two bearings (13) are rotatably installed on the upper screen fixed rod (12), the upper screen (3) is fixed on the upper screen fixed rod (12), the upper screen (3) is larger than the lower screen (5) in diameter, the upper screen (3) is the same as the lower screen (5) in diameter.

2. A high efficiency grain cleaning apparatus as defined in claim 1, wherein The air outlet pipe (4) is fixed on the lower screen (5), the air outlet pipe (4) is sleeved on the positioning air guide pipe (7), the lower screen drive rod (6) is connected with the air outlet pipe (4) through a ball hinge, the lower screen fixed seat (15) and the discharge hopper (8) are fixed on the shell (2), the motor b (16) and the motor b shield (17) are fixed on the lower screen fixed seat (15), the lower screen drive rod (6) is rotatably installed on the lower screen fixed seat (15), the power output shaft of the motor b (16) is connected with the lower screen drive rod (6) through a belt (14), and the air pipe (18) is sleeved on the positioning air guide pipe (7).

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