CN208912557U - Winnowing type grain cleaning experimental rig - Google Patents
Winnowing type grain cleaning experimental rig Download PDFInfo
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- CN208912557U CN208912557U CN201821660413.2U CN201821660413U CN208912557U CN 208912557 U CN208912557 U CN 208912557U CN 201821660413 U CN201821660413 U CN 201821660413U CN 208912557 U CN208912557 U CN 208912557U
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Abstract
The utility model discloses a kind of Winnowing type grain cleaning experimental rigs, including conveying and its speed-regulating system, wind-force and its regulator control system, vibrosieve system, flow velocity measuring system and collection system.The conveying and its speed-regulating system includes conveyer belt, baffle, driving roller, belt tensioning drum, self-aligning roller, transfer gantry, speed regulating motor I, frequency converter I.The wind-force and its regulator control system includes outer rotor double air intake blower fan, protective net, frequency converters II, wind direction regulating device.The vibrosieve system includes packet frame sieve, double-deck screen frame (unit), vibrating mechanism, speed regulating motor II, frequency converter III, vibration frame.The flow velocity measuring system includes air velocity transducer, sensor stand, programmable controller.The collection system includes material collection case, cushion rubber bumper, arc nylon resistance material net.
Description
Technical field
The utility model belongs to grain cleaning technology and equipment research and development technology field, is related to a kind of research grain cleaning technology
And the experimental rig of device.
Background technique
The Winnowing type technology of cleaning is the technology that wind-force isolation technics is combined with vibrosieve technology, and wind-force separates skill
Art is suitable for the separation between the big mixed material of granular mass difference, and imitates to the separation for the mixed material that granular mass is close
Fruit is bad, and vibrosieve technology can be used for separating the mixed material that granular mass is close and particle size is different, and Winnowing type is clear
Selecting technology has both the advantages of wind-force isolation technics and vibrosieve technology, and compensates for the deficiency of every technology, is suitable for separation
Seed and light sundries in cereal emersion object.Existing Type Airflow Rice-Wheat Cleaning Apparatus with Centrifugal Fan-Oscillating Sieve mostly uses common centrifugal blower to carry out selection by winnowing, commonly
Centrifugal blower single admission, air outlet is narrow, and actual cut is cleaned using double air intake blower fans, blower axial direction both sides air inlet, tangentially
Outlet air, air outlet are roomy.The blower air-out direction and vibrating screen amplitude of existing Type Airflow Rice-Wheat Cleaning Apparatus with Centrifugal Fan-Oscillating Sieve, inclination angle are often non-adjustable.
Operating condition is cleaned it is therefore desirable to designing a kind of fitting actual cut, the adjustable Winnowing type of running parameter is cleaned and cleans experimental rig,
It designs for harvest cleaning plant structure and cleans work layout and test instrument is provided.
Summary of the invention
The utility model is intended to provide the Winnowing type grain cleaning experimental rig that a kind of structure is simple, easy to adjust.
The utility model is implemented with the following technical solutions:
The utility model Winnowing type grain cleaning experimental rig includes conveying and its speed-regulating system, wind-force and its regulation system
System, vibrosieve system, flow velocity measuring system and collection system.The conveying and its speed-regulating system include conveyer belt, baffle,
Drive roller, belt tensioning drum, self-aligning roller, transfer gantry, speed regulating motor I, frequency converter I.Roller will be driven, self-aligning roller, opened
Tight roller is uniformly mounted on transfer gantry by roller bearing and bearing, and conveyer belt is around roller of overdriving, self-aligning roller and tensioning rolling
Cylinder, and position of the belt tensioning drum on transfer gantry is adjusted come Conveyer Belt, transfer gantry tilting section and level using bolt
Section is connected by arc frid, is separately fixed on horizontal segment and tilting section bracket using the slot that two bolts pass through arc frid
And realize connection.Speed regulating motor I is connected by box coupling with driving roller, controls motor speed, frequency conversion using frequency converter I
Device I can I revolving speed of real-time display motor.The wind-force and its regulator control system includes outer rotor double air intake blower fan, protective net, frequency conversions
Device II, wind direction regulating device.Nylon protective net is coated at air inlet, prevents sucking sundries, protection staff safety.Blower
It is connected with wind direction regulating device by flanged joint, air-out direction is adjusted using wind direction regulating device, by rotating tuning handle
The direction of guide vane is controlled, using wing nut lock handle position, the revolving speed of blower motor is controlled using frequency converter II
Wind speed is cleaned to adjust, frequency converter II can real-time display motor speed.The vibrosieve system includes packet frame sieve, bilayer
Screen frame (unit), vibrating mechanism, speed regulating motor II, frequency converter III, vibration frame.By sieve packet on screen bed base, using pressure network plate and spiral shell
It follows closely fixed grit and constitutes packet frame sieve, two layers of inward flange being arranged in the double-deck screen frame (unit) is equivalent to " drawer ", convenient for packet frame sieve
It picks and places, adjusts position of the packet frame sieve in the double-deck screen frame (unit) to adjust sieve inclination angle, using screw fixed grit inclination angle, the double-deck screen frame (unit)
Hinged by four rocking bars and vibration frame, speed regulating motor II, which is bolted, to be fixed on vibration frame, speed regulating motor II
It is connected by right angle box coupling with movable crank, adjusting activity crank is adjusted relative to the position of right angle box coupling
Amplitude controls II revolving speed of motor using frequency converter III to adjust vibration frequency, and frequency converter III can II revolving speed of real-time display motor.Vibration
Motivation frame underlay damping block, and it is fixed on the ground by expansion bolt.The flow velocity measuring system includes air velocity transducer, passes
Sensor bracket, programmable controller.Collected signal is transmitted to programmable controller, programmable controller by air velocity transducer
After calculation process can real-time display air speed value, and can air speed value be stored and be exported, air velocity transducer be evenly arranged in biography
It on sensor bracket, and protrudes into the double-deck screen frame (unit), moves integrally sensor stand and air velocity transducer is adjusted in the double-deck screen frame (unit)
Position, programmable controller are placed outside on workbench.The collection system includes material collection case, cushion rubber bumper, arc Buddhist nun
Imperial resistance material net.Material collecting box is set immediately below the double-deck screen frame (unit) to collect the material after cleaning, is uniformly divided in material collection case
Eight small casees are divided into, one layer of cushion rubber bumper is laid in each small case, convenient for taking out material together with rubber mat, to observe, to collect
Measurement.Stop and gather a large amount of light sundries being blown out using arc nylon resistance material net, prevents pollution environment, be convenient to clean.
Compared with prior art, the utility model has the advantages that (1) existing cleaning plant blower mostly uses centrifugation wind
Machine, the utility model is using the double air intake blower fans of outer rotor, and blower axial direction two-way air intake, tangential outlet air, air outlet is roomy, air quantity
Greatly, operating condition is cleaned with actual cut to be close.(2) the utility model is equipped with wind direction regulating device, using with angle index
Mechanical handle adjusts wind direction, can easily be accommodated.(3) sieve packet is constituted packet frame sieve by the utility model on screen bed base, and sieve is more
It changes quick.(4) the utility model changes crank length in such a way that movable crank is matched with right angle box coupling, adjusts
The i.e. adjustable sieve inclination angle in position of the knotter screen net in screen frame (unit), it is easy to adjust.(5) wire type air velocity transducer is used, interference resistance is strong,
Measuring range is big (0 ~ 30 m/s), and precision is high, and (resolution ratio can clean the emersion object of multiple kinds of crops up to 0.05 m/s)
Test.(6) it is measured using programmable controller control, measurement data real-time display, data storage is taken conveniently.(7) it uses and divides
The mode collection material that area is collected is equipped with cushion rubber bumper and is used for collection material convenient for distribution situation of the observation material after cleaning,
It can prevent material bullet from jumping and losing.(8) device for transporting objects of the utility model is equipped with baffle, is convenient for uniform spreading emersion object
And it prevents from losing.(9) the utility model stops sundries using 20 mesh nylon wires, small to windage is cleaned.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the main view of the wind direction regulating device of the utility model.
Fig. 3 is the top view of the wind direction regulating device of the utility model.
Fig. 4 is the main view of the packet frame sieve of the utility model.
Fig. 5 is the top view of the packet frame sieve of the utility model.
Fig. 6 is the movable crank of the utility model and the assembling schematic diagram of right angle box coupling.
Fig. 7 is the main view of the sensor stand of the utility model.
Fig. 8 is the left view of the sensor stand of the utility model.
Fig. 9 is the sensor fixation plate of the utility model and the main view of flange conduit saddle.
Figure 10 is the sensor fixation plate of the utility model and the top view of flange conduit saddle.
In figure: 1, speed regulating motor I, 2, driving roller, 3, baffle, 4, conveyer belt, 5, self-aligning roller, 6, transfer gantry, 7,
Frequency converter I, 8, frequency converter II, 9, frequency converter III, 10, programmable controller, 11, the double air intake blower fans of outer rotor, 12, protective net,
13, speed regulating motor II, 14, vibration frame, 15, movable crank, 16, right angle box coupling, 17, vibrating mechanism, 18, wind direction tune
Regulating device, 19, belt tensioning drum, 20, the double-deck screen frame (unit), 21, rocking bar, 22, sensor stand, 23, packet frame sieve, 24, wind speed sensing
Device, 25, material collection case, 26, cushion rubber bumper, 27, arc nylon resistance material net, 28, tuning handle, 29, wing nut, 30, lead
To blade, 31, tranverse connecting rod, 32, pressure network plate, 33, hexagonal flange screw, 34, sieve, 35, screen bed base, 36, sensor fixation plate,
37, sensor carrier, 38, poly (methyl methacrylate) plate, 39, flange conduit saddle.
Specific embodiment
The utility model is further elaborated with reference to the accompanying drawing.
As shown in Figure 1, the Winnowing type grain cleaning experimental rig of the utility model, including conveying and its speed-regulating system, wind
Power and its regulator control system, vibrosieve system, flow velocity measuring system and collection system.The conveying and its speed-regulating system include
Conveyer belt 4, baffle 3, driving roller 2, belt tensioning drum 19, self-aligning roller 5, transfer gantry 6, speed regulating motor I 1, frequency converter I 7.It drives
Dynamic roller 2, self-aligning roller 5, belt tensioning drum 19 are uniformly mounted on transfer gantry 6 by bearing and screw connection, conveyer belt 4 around
It overdrives roller 2 and belt tensioning drum 19, and is supported on self-aligning roller 5, belt tensioning drum 19 is adjusted in transfer gantry 6 using bolt
On position carry out Conveyer Belt 4, transfer gantry 6 is connected with two sections of tilting section by arc frid by horizontal segment, tilting section to
Lower 11 ° of inclination, roller and carrying roller are evenly arranged on transfer gantry 6, are respectively arranged one on the transfer gantry 6 of 4 two sides of conveyer belt
Baffle 3；Speed regulating motor I 1 is connected by box coupling with driving roller 2, controls speed regulating motor I 1 using frequency converter I 7
Revolving speed, frequency converter I 7 can real-time display motor speeds.
As shown in Figure 1, 2, 3, the wind-force of Winnowing type grain cleaning experimental rig and its regulator control system include outer rotor it is double into
Wind blower 11, protective net 12, frequency converter II 8, wind direction regulating device 18.The double air intake blower fans 11 of outer rotor are driven using external rotor electric machine
It is dynamic, outer rotor 11 revolving speed of double air intake blower fans is controlled using frequency converter II 8, frequency converter II 8 can the double air inlet wind of real-time display outer rotor
11 revolving speed of machine；Double 11 setting angles of air intake blower fan of outer rotor are 25 ° left, fan outlet and the side of being welded with of wind direction regulating device 18
Wind direction regulating device 18 is connected by shape flange flange by flange with fan outlet, is controlled by rotation tuning handle 28
The direction of guide vane 30, two guide vanes 30 are connected by tranverse connecting rod 31, are rotated simultaneously, using 29 lock handle of wing nut
Position, two air inlet of blower respectively coat one layer of nylon protective net 12, prevent sucking sundries, protection staff safety.
As shown in Fig. 1,4,5,6, the vibrosieve system of Winnowing type grain cleaning experimental rig includes packet frame sieve 23, double
Layer screen frame (unit) 20, vibrating mechanism 17, speed regulating motor II 13, frequency converter III 9, vibration frame 14.The packet frame sieve 23 is by sieve
34 packets compress sieve 34 on " mesh " font screen bed base 35, with pressure network plate 32, and use 33 fixed grit 34 of hexagonal flange screw.
Double-deck 20 structure of screen frame (unit) is prolate cube shape, transparent, is linked to be by four blocks of side plates all around rectangular, each side plate junction is equal
It thickeies and reinforces, four sides side plate is equipped with two circle inward flanges inside screen frame (unit), and two inward flanges are uniformly distributed along screen frame (unit) short transverse, screen frame (unit)
Right low left high inclination installation, left plate are located above fan outlet, and front and back side plate low side symmetrically opens up arc-shaped slot, hole external standard
Angled scale, right side plate middle part open up rectangular opening, rectangular opening length and screen frame (unit) equivalent width.Packet frame sieve 23 is placed in double deck screen
It on 20 inward flange of frame, and is fastened by screw, the double-deck screen frame (unit) 20 is hinged by four rocking bars 21 and vibration frame 14.The bobbing machine
Structure 17 is mounted on vibration frame 14, using crank and rocker mechanism, is connected under four rocking bars 21 and is connected rack on screen frame (unit), four rocking bars 21
Lower end is hinged on the forward and backward side plate of the double-deck screen frame (unit), and upper end is hinged on vibration frame 14, the vertical parallel uniform cloth of four rocking bars 21
It sets, each uniformly hinged two rocking bars 21 of the outer middle side part of side plate before and after the double-deck screen frame (unit)；Connecting rod one end is hinged on the double-deck screen frame (unit) left plate
Outer lower portion middle position, the other end and movable crank 15 are hinged；Movable crank 15 is L shape rod piece, by quarter butt Duan Yuchang rod segment
It is vertically connected composition, quarter butt section and connecting rod are hinged, and long rod segment is connected with right angle box coupling 16, and long rod segment designated position indicates
Length scale, scale range are 35 mm, and right angle box coupling 16 is vertically fixed together by two sleeves and is constituted, right angle sleeve
16 one end of shaft coupling is connected with movable crank 15, and the other end is connected with motor shaft, and is fastened using screw.The speed regulation electricity
Machine II 13 is fixed on vibration frame 14 by three pieces of connecting plates, and speed regulating motor II 13 passes through right angle box coupling 16 and activity
Crank 15 is connected, and adjusting activity crank 15 carrys out adjusting amplitude relative to the position of right angle box coupling 16.Using frequency converter III 9
II 13 revolving speed of speed regulating motor is controlled to adjust vibration frequency, frequency converter III 9 can real-time display motor speed.14 underlay of vibration frame
Damping block, and it is fixed on the ground by expansion bolt.
As shown in Fig. 1,7,8,9,10, the flow velocity measuring system of Winnowing type grain cleaning experimental rig includes air velocity transducer
24, sensor stand 22, programmable controller 10.It is equipped with air velocity transducer 24 at 18 export center of wind direction regulating device, passes
Sensor bracket 22 is made of sensor fixation plate 36 and sensor carrier 37, is consolidated air velocity transducer 24 using flange conduit saddle 39
It is scheduled on the sensor fixation plate 36 of sensor stand, sensor fixation plate 36 is bolted on sensor carrier 37
On, sensor protrudes into the double-deck screen frame (unit), the depth that adjustable sensor protrudes into, and moves integrally sensor stand 22 and wind speed is adjusted
Position of the sensor 24 in the double-deck screen frame (unit) 20 not only can measure the air speed value near compass screen surface but also avoid mutually touching with vibrating screen.?
Sensor carrier 37 is forward and backward, poly (methyl methacrylate) plate 38 is installed on upper three face, reduces outer bound pair and cleans the influence in flow field, and ensures
Personnel safety.The programmable controller 10 configures LED display and is placed on workbench, and air velocity transducer 24 is by collected letter
Number it is transmitted to programmable controller 10, controller real-time monitoring and can be shown at fan outlet and compass screen surface after calculation process
Neighbouring wind speed profile situation, and can air speed value be stored and be exported, the work of controlled wind speed sensor 24.
As shown in Figure 1, the collection system of Winnowing type grain cleaning experimental rig includes material collection case 25, cushion rubber bumper
26, arc nylon resistance material net 27.Material collection case 25 is located at immediately below the double-deck screen frame (unit) 20, and structure is prolate cube shape, and top is logical
Thoroughly, inside is evenly arranged seven pieces of diaphragm plates and is separated into eight small casees, and diaphragm plate is inserted into the groove in material collecting box 25, in cross
Partition each of separates in small case one block buffering rubber mat 26 of laying, convenient for taking out material together with cushion rubber bumper 26, to see
It examines, collect measurement.Nylon wire packet constitutes to arc nylon resistance material net 27 in arc stand, arc nylon resistance material net 27 stand on away from
The position of 0.5-0.6 meters of 25 right end of material collection case, arc nylon resistance material net 27 stop and gather a large amount of light sundries being blown out,
Pollution environment is prevented, is convenient to clean.
Claims (5)
1. a kind of Winnowing type grain cleaning experimental rig, which is characterized in that Winnowing type grain cleaning experimental rig include conveying and
Its speed-regulating system, wind-force and its regulator control system, vibrosieve system, flow velocity measuring system and collection system；
The conveying and its speed-regulating system includes conveyer belt, baffle, driving roller, belt tensioning drum, self-aligning roller, conveying branch
Frame, speed regulating motor I, frequency converter I；Driving roller and belt tensioning drum are mounted on transfer gantry both ends by its roller bearing and bearing, and two
Root self-aligning roller is uniformly mounted on transfer gantry by its roller bearing and bearing, conveyer belt around roller and the belt tensioning drum of overdriving,
And be supported on self-aligning roller, position of the belt tensioning drum on transfer gantry is adjusted come Conveyer Belt, conveying branch using bolt
Frame is connected with two sections of tilting section by arc frid by horizontal segment, and a gear is respectively arranged on the transfer gantry of conveyer belt two sides
Plate, speed regulating motor I are connected by box coupling with driving roller, and frequency converter I controls the revolving speed of speed regulating motor I, and frequency converter I can
Real-time display motor speed；
The wind-force and its regulator control system includes outer rotor double air intake blower fan, protective net, frequency converters II, wind direction regulating device；
The double air intake blower fans of outer rotor are by outer rotor motor driven, and frequency converter II controls the double air intake blower fan revolving speeds of outer rotor, and frequency converter II can
The double air intake blower fan revolving speeds of real-time display outer rotor, fan outlet and wind direction regulating device are welded with square flange flange, pass through
Wind direction regulating device is connected by flange with fan outlet, and the direction of guide vane, two guiding are controlled by rotation tuning handle
Blade is connected while being rotated by tranverse connecting rod, and using wing nut lock handle position, two air inlet of blower respectively coats one layer
Nylon protective net；
The vibrosieve system includes packet frame sieve, the double-deck screen frame (unit), vibrating mechanism, speed regulating motor II, frequency converter III, vibration
Rack；The packet frame sieve is to compress sieve with pressure network plate, and use hexagonal flange by sieve packet on " mesh " font screen bed base
Screw fixed grit, the double-deck screen frame (unit) structure be prolate cube shape, it is transparent, be linked to be by four blocks of side plates all around it is rectangular, respectively
Side plate junction thickeies reinforcement, and four sides side plate is equipped with two circle inward flanges inside screen frame (unit), and two inward flanges are along screen frame (unit) short transverse
It is uniformly distributed, screen frame (unit) right low left high inclination installation, left plate is located above fan outlet, and front and back side plate low side symmetrically opens up arc
Shape slot, the angled scale of hole external standard, right side plate middle part open up rectangular opening, rectangular opening length and screen frame (unit) equivalent width, packet frame sieve
Net is placed on the double-deck screen frame (unit) inward flange, and is fastened by screw, and the double-deck screen frame (unit) is hinged by four rocking bars and vibration frame, the vibration
Motivation structure uses crank and rocker mechanism, is connected by movable crank, connecting rod and four rocking bars and is constituted, using connecting bilayer under four rocking bars
Screen frame (unit), upper even vibration frame, four rocking bar lower ends are respectively hinged on the forward and backward side plate of the double-deck screen frame (unit), four rocking bar upper end difference
It is hinged on vibration frame, four rocking bars are evenly arranged in parallel vertically, and the outer middle side part of side plate is each uniformly hinged before and after the double-deck screen frame (unit)
Two rocking bars, connecting rod one end are hinged on the double-deck screen frame (unit) left plate outer lower portion middle position, and the other end and movable crank are hinged；It is living
Dynamic crank is L shape rod piece, is vertically connected and is constituted by quarter butt Duan Yuchang rod segment, quarter butt section and connecting rod are hinged, long rod segment and right-angled sheath
Cylinder shaft coupling is connected, and long rod segment designated position indicates length scale, and right angle box coupling is vertically fixed together by two sleeves
It constituting, right angle box coupling one end is connected with movable crank, and the other end is connected with motor shaft, and is fastened using screw,
The speed regulating motor II is fixed on vibration frame by three pieces of connecting plates, and speed regulating motor II passes through right angle box coupling and work
Dynamic crank is connected, and adjusting activity crank carrys out adjusting amplitude relative to the position of right angle box coupling, is controlled using frequency converter III
II revolving speed of speed regulating motor adjusts vibration frequency, frequency converter III can real-time display motor speed, vibration frame underlay damping block, and
It is fixed on the ground by expansion bolt；
The flow velocity measuring system includes air velocity transducer, sensor stand, programmable controller；Go out in wind direction regulating device
Mouth is equipped with air velocity transducer at center, and sensor stand is made of sensor fixation plate and sensor carrier, using flanged pipe
Air velocity transducer is fixed on the sensor fixation plate of sensor stand by support, and sensor fixation plate is bolted on sensing
On device carrier, sensor is protruded into the double-deck screen frame (unit), the depth that adjustable sensor protrudes into, and it is adjustable to move integrally sensor stand
Position of the air velocity transducer in the double-deck screen frame (unit) is saved, not only can measure the air speed value near compass screen surface but also avoids mutually touching with vibrating screen,
Sensor carrier is forward and backward, installs poly (methyl methacrylate) plate on upper three face, reduce the influence that outer bound pair cleans flow field, it is described to compile
Range controller configuration LED display is placed on workbench, and collected signal is transmitted to programmable controller by air velocity transducer,
Controller real-time monitoring and can show the wind speed profile situation at fan outlet and near compass screen surface after calculation process, and can
Air speed value is stored and exported, the work of controlled wind speed sensor；
The collection system includes material collection case, cushion rubber bumper, arc nylon resistance material net；Material collection case is located at double deck screen
Immediately below frame, structure is prolate cube shape, and top is penetrating, and inside is evenly arranged seven pieces of diaphragm plates and is separated into eight small casees, tabula
Plate is inserted into the groove in material collecting box, one block buffering rubber mat of laying each of is separated in small case in diaphragm plate, convenient for connecting
Cushion rubber bumper takes out material together, and to observe, collect measurement, nylon wire packet is constituted arc nylon resistance material in arc stand
Net.
2. Winnowing type grain cleaning experimental rig according to claim 1, which is characterized in that the transfer gantry inclines
Oblique section tilts down 11 °.
3. Winnowing type grain cleaning experimental rig according to claim 1, which is characterized in that the double air inlets of the outer rotor
Assembling angle is 25 ° left.
4. Winnowing type grain cleaning experimental rig according to claim 1, which is characterized in that the length of the movable crank
The scale range of rod segment designated position is 35 mm.
5. Winnowing type grain cleaning experimental rig according to claim 1, which is characterized in that the arc nylon resistance material
Net stands on position of 0.5 ~ 0.6 meter away from material collection case right end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821660413.2U CN208912557U (en) | 2018-10-14 | 2018-10-14 | Winnowing type grain cleaning experimental rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821660413.2U CN208912557U (en) | 2018-10-14 | 2018-10-14 | Winnowing type grain cleaning experimental rig |
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| Publication Number | Publication Date |
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| CN208912557U true CN208912557U (en) | 2019-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092688A (en) * | 2018-10-14 | 2018-12-28 | 山西农业大学 | Winnowing type grain cleaning experimental rig |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092688A (en) * | 2018-10-14 | 2018-12-28 | 山西农业大学 | Winnowing type grain cleaning experimental rig |
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