CN105746099B - A kind of design method of the uniform discharge line of air-flow - Google Patents
A kind of design method of the uniform discharge line of air-flow Download PDFInfo
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- CN105746099B CN105746099B CN201610229929.0A CN201610229929A CN105746099B CN 105746099 B CN105746099 B CN 105746099B CN 201610229929 A CN201610229929 A CN 201610229929A CN 105746099 B CN105746099 B CN 105746099B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/48—Air conduits or blowers for grain
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of design methods of the uniform discharge line of air-flow, airflow line includes air-flow manifold and airflow manifold, wherein air-flow manifold is a cone shape pipeline with specific taper, air-flow manifold tapers size so that each airflow manifold gas flow is equal subject to；Airflow manifold is that a comb diameter is equal and equidistantly distributed is in the sides air-flow manifold, and generates the pipeline path of uniform air flow speed；Airflow manifold is connected with air-flow manifold interfaces in the form of smooth curve, and airflow manifold exit end face has one 45 ° of bendings, and the minimum length of airflow manifold is equal to air-flow manifold big ends bottom and standing grain center of effort position height differenceTimes, blow straw convenient for being applied to the air-sweeping type ceding of Taiwan.The design method of the uniform discharge line of air-flow according to the present invention is conducive to the resistance coefficient for reducing pipeline, keeps the air velocity of airflow manifold outlet end more uniform.
Description
Technical field
The present invention relates to a kind of design method of the uniform discharge line of air-flow more particularly to a kind of cell rice and kernel combinings
The design method of machine air-sweeping type ceding of Taiwan gas uniform flow pipeline.
Technical background
In recent years, the domestic cell rice wheat combine harvester for developing two kinds of forms.One is change from traditional harvest machine
And then material is sucked threshing cylinder by the cell wheat crops combine harvester come, the negative pressure generated by hulling disk from the ceding of Taiwan,
But it may result in blocking when material is moister.And the ceding of Taiwan has seed residual, is not easily cleaned.Another kind is aspiration comb
De- formula seeds in combination harvester, using the ceding of Taiwan of aspiration comb-threshing-type, this ceding of Taiwan has the spies such as feed quantity is small, power consumption is few
Point, but there are seed spatter loss, leakages to take off loss, rewinds loss during comb is de-, and the rate that causes damages is excessively high.In cell harvest
Single hillslope processes area is small, and the quantity of hillslope processes is more, and Seed cleaning up will be carried out to harvester by often harvesting a cell, to keep away
Exempt from mixing for different cultivars district seed.A kind of noresidue, low loss late air-sweeping type header device be more reasonably to select.
Cell rice wheat combine harvester air-sweeping type header device, including positive air flow Chui He mechanisms, side airflow descaling machine
Structure, blow standing grain air-flow regulating mechanism, spiral is winnowed screw feeder, cutter, nearside divider, wind turbine.Positive air flow Chui He mechanisms include that air-flow is total
Pipe, airflow manifold, hose, blast regulator.Wherein positive air flow blows standing grain instead of traditional winder, and standing grain is blown down and is cut again
It cuts, plays the role of blowing to seed, stalk inside the ceding of Taiwan again while harvesting.
Invention content
The purpose of the present invention is to propose to a kind of design methods of the uniform discharge line of air-flow, it is characterised in that discharge air-flow compared with
Uniformly, the resistance coefficient of pipeline is small.
The technical scheme is that：A kind of design method of the uniform discharge line of air-flow, airflow line includes that air-flow is total
Pipe and airflow manifold, design method include the following steps：
(1) minimum straw amount of deflection λ is determined according to the sphere of action Δ x of one block pressur plate of winder；
(2) according to the bending stiffness EI of rice and kernel stalk, length L, amount of deflection λ, by the deflection differential equation of the mechanics of materials, meter
Calculate the relationship for acting on power F and amount of deflection λ in stalk；
(3) relationship that stalk stress F and air velocity V are calculated by aerodynamic knowledge, in conjunction in step (1)
The relationship for acting on the power F and amount of deflection λ in stalk, calculates the relationship of air velocity V and amount of deflection λ；
(4) according to the self moulding function of the fluidic structures of subsonic speed free jet and velocity field, airflow manifold is calculated
Diameter and the relationship for arranging spacing and airflow field VELOCITY DISTRIBUTION；
(5) according to air-flow manifold big ends bottom and straw center of effort position height differenceDetermine airflow manifold most again
Small length L2, make during the ceding of Taiwan is advanced, air-flow manifold will not be collided with standing grain and be caused grain loss, while can also make air-flow pair
The moment of flexure of standing grain is maximum；
(6) according to the grain cutting width of the cell rice wheat combine harvester air-sweeping type ceding of Taiwan divided by the arrangement spacing meter of airflow manifold
Calculate the number of airflow manifold；
(7) assume the diameter of air-flow manifold big ends, the areas of section of air-flow manifold big ends subtracts first airflow manifold
Area of section is approximately equal to the air-flow manifold areas of section at the airflow manifold center, the air-flow at first airflow manifold center
It is total that manifold areas of section subtract the air-flow that the area of section of second airflow manifold is approximately equal at second airflow manifold center
Tube section area, and so on, it finally determines the diameter of air-flow manifold small ends, thereby determines that the taper of air-flow manifold.
To keep the air-flow that airflow line is discharged relatively uniform, airflow manifold is designed to that diameter is equal, is distributed at equal intervals
The sides air-flow manifold, and the outlet end of each airflow manifold is equal at a distance from the total tube hub line of air-flow.
During reducing harvester operation advance, air-flow manifold collides generation seed with rice and kernel standing grain and falls, by air-flow branch
Bending at 45 ° is designed in pipe outlet end, to improve the height of air-flow manifold, so that air-flow manifold is higher than wheat standing grain, while can make air-flow
Branch pipe horizontal direction projects air-flow.
To reduce the resistance coefficient of gas flow tube, according to the inlet and outlet design method of hydrodynamics pipeline by air-flow manifold and gas
The interface of stream branch pipe is designed to smooth curve transition.
The advantages of this reality is invented is：Provide a kind of design method of discharge air-flow uniform tube.Wherein air-flow manifold
With specific taper, ensure that the air velocity of airflow manifold outlet end is equal；Airflow manifold and air-flow manifold smooth curve mistakes
It crosses, reduces resistance coefficient, reduce air-flow flow losses；When airflow manifold blows standing grain work, airflow manifold outlet port hangs down with straw
Directly, by using 45 ° of bendings and specific length, air-flow manifold can be improved so that air-flow manifold is higher than standing grain, prevents because before the ceding of Taiwan
Into when grain loss caused by the collision of air-flow manifold and standing grain, while airflow manifold can also reduce air-flow using 45 ° of curve transition
Branch pipe and grain loss caused by standing grain collision.
Description of the drawings
Fig. 1 is the structural schematic diagram of the cell rice wheat combine harvester air-sweeping type ceding of Taiwan；
Fig. 2 is airflow line figure；
Fig. 3 is the right view of Fig. 2；
Fig. 4 is wheat culm stress sketch；
Fig. 5 is that airflow line blows wheat model schematic diagram；
Wherein：1- side airflows cleaning mechanism, 2- cedings of Taiwan frame, 3- cutteves, 4- air-flow manifold, 5- airflow manifold, 6- divide standing grain
Device, 7- blow standing grain air-flow regulating mechanism, 8- spirals are winnowed screw feeder, 9- spouts, 10- hoses, 11- blast regulators, 12- wind turbines,
13- wheat standing grain.
Specific implementation mode
By taking swath is one meter of cell rice wheat combine harvester air-sweeping type ceding of Taiwan getting wheat as an example, it is equal to design a kind of air-flow
The pipeline of even discharge, the specific steps are：
(1) minimum straw amount of deflection λ is equal to the sphere of action of one block pressur plate of winder
In formula：R- is winder radius；
μ-is winder speed ratio；
(2) it being calculated to simplify, the stress sketch of wheat culm are as shown in Figure 4, it is assumed that wheat culm is the concentric circles band of column,
Wind is vertical with stalk always to the active force of stalk, and be uniform load, according to the bending stiffness EI of wheat culm, plant height L,
Amount of deflection λ, stalk part of the force length is a, by the deflection differential equation of the mechanics of materialsIt calculates and acts on wheat stalk
Stress F and the relationship of amount of deflection λ on stalk are：
(3) by air drag formula：With the relationship of stress F and amount of deflection λ in step (1) on wheat culm,
It calculates air velocity v and the relationship of amount of deflection λ is：
In formula：C- coefficient of air resistances；
ρ-atmospheric density；
S- stalk front face areas.
(4) according to the self moulding function of the fluidic structures of subsonic speed free jet and velocity field, airflow manifold is calculated
Diameter and the relationship for arranging spacing and airflow field VELOCITY DISTRIBUTION；
(5) air-flow blow wheat model schematic diagram as shown in figure 5, airflow manifold minimum length lengthWherein H is
The difference in height of air-flow manifold big ends bottom and straw center of effort position；
(6) grain cutting width of the cell rice wheat combine harvester air-sweeping type ceding of Taiwan divided by the arrangement distance computation of airflow manifold go out
The number of airflow manifold；
(7) assume that the diameter of air-flow manifold big ends, the area of section of gas flow tube big end subtract section of first airflow manifold
Face area approximation is equal to the air-flow manifold areas of section at the airflow manifold center, and the air-flow at first airflow manifold center is total
The area of section that tube section area subtracts second airflow manifold is approximately equal to air-flow manifold at second airflow manifold center
Area of section, and so on, it finally determines the diameter of air-flow manifold small ends, thereby determines that the taper of air-flow manifold；
Air-flow manifold and the interface of airflow manifold are designed to smooth curve transition.
Detailed description at 45 ° is designed according to [007] in airflow manifold outlet end.
Claims (3)
1. a kind of design method of the uniform discharge line of air-flow, wherein airflow line include air-flow manifold and airflow manifold, special
Sign is：For the purpose of uniform air flow is discharged and straw is made to blow down, design procedure is：
(1) minimum straw amount of deflection λ is equal to the sphere of action of one block pressur plate of winderFormula
Middle R is winder radius, and μ is winder speed ratio；According to the bending stiffness EI, length L, amount of deflection λ of rice and kernel stalk, by material power
Deflection differential equation calculates the relationship for acting on the F of the power in stalk and amount of deflection λ, then by aerodynamic knowledge
The relationship for calculating stalk stress F and air velocity V, to calculate the relationship of air velocity V and amount of deflection λ；
(2) according to the self moulding function of the fluidic structures of subsonic speed free jet and velocity field, the diameter of airflow manifold is calculated
With the relationship of arrangement spacing and airflow field VELOCITY DISTRIBUTION；
(3) according to air-flow manifold big ends bottom and straw center of effort position height differenceDetermine that the minimum of airflow manifold is long again
Spend L2；
(4) gone out according to the arrangement distance computation of the grain cutting width of the cell rice wheat combine harvester air-sweeping type ceding of Taiwan divided by airflow manifold
The number of airflow manifold；
(5) assume that the diameter of air-flow manifold big ends, the area of section of air-flow manifold big ends subtract the section of first airflow manifold
Area approximation is equal to the air-flow manifold areas of section at the airflow manifold center, the air-flow manifold at first airflow manifold center
The area of section that area of section subtracts second airflow manifold is approximately equal to air-flow manifold at second airflow manifold center and cuts
Face area, and so on, it finally determines the diameter of air-flow manifold small ends, thereby determines that the taper of air-flow manifold.
2. a kind of design method of the uniform discharge line of air-flow according to claim 1, it is characterised in that：Airflow manifold
Internal diameter is equal, is distributed in the sides air-flow manifold at equal intervals, and there are one 45 ° of bendings, each airflow manifold in airflow manifold outlet end
Outlet end it is equal at a distance from the total tube hub line of air-flow.
3. a kind of design method of the uniform discharge line of air-flow according to claim 1, it is characterised in that：Airflow manifold and
The transition in the form of smooth curve of the joints air-flow manifold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610229929.0A CN105746099B (en) | 2016-04-12 | 2016-04-12 | A kind of design method of the uniform discharge line of air-flow |
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| CN105746099A CN105746099A (en) | 2016-07-13 |
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