玉米脱粒机的译文英语.doc
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1、精品文档,仅供学习与交流,如有侵权请联系网站删除Design and Experiment of 4YQZ-3A Combine Harvester for CornZhang Xirui Dong Youfu Zhang Daolin(School of Mechanics and Electrics Engineering Hainan University Danzhou, China zhangxirui_999)AbstractDue to the problem of the low retrieving rate of straw while harvesting, fodder
2、 went sort in stock raising and to overcome the practical problem of corn harvester reaping both corn stalk and spike while in operation, 4YQZ-3A combine harvester was designed, analyzed and the parameters of key components were pointed out for better gripping delivery mechanism, vertical picking an
3、d chopping cutter, helicinae and throwing apparatus.During the corn harvesting season, numerous performance testing and the production assessment were carried out in the field. Results achieved from the experiment indicate that the whole machine has better performance and can accomplish reaping both
4、 corn stalk and spike well.Keywords- corn harvester; picking and threshing harvester; design; Experiment1.introductionCorn is Chinas second-largest food crop, occupies an important position in food production1. Maize straw contains a lot of crude protein, crude fat and fiber nutrient component, etc.
5、 Thus it is one of the most perfect forage of high quality in animal husbandry.The national annual production of corn straw is about 60,000 tons, which is a huge potential forage source 4.Corn harvester reaping both corn stalk and spike can complete the harvest of corn ear and stalks within one time
6、, so it has significant economic, social and eco- system efficiency 5-6. At present, corn harvester reaping both corn stalk and spike still develops very slow, and the domestic model mainly are hanging type. Because of underpowered, low production efficiency and straw cleanness, it has not been rapi
7、dly promoted 7-8.Foreign models are mainly Ukrainian KCKY-6 Corn harvest machine and Corn Star series united harvest machine developed by Kempe Co. in German, due to untidy stubble height and higher price, this type of air-craft is not suitable for Chinas national conditions 9-11.Foundation item: Pu
8、blic beneficial(agriculture)Science research fund issue(200903059-04)On the basis of the tenth-five national research tackle key problems in science and technology research, in this article 4YQZ-3A combine harvester was designed, which combines existing corn harvest and corn silage mechanization tec
9、hnique and improves the design and optimizes the combination for each working device. During the of harvest corn ear, the 4YQZ-3A combine harvester can also complete cutting, conveying, chopping collection and root crop broken tasks and so on; With the popularization and appli-cation of this techniq
10、ue , we can solve the problem of corn straw recovery and reduce the waste of straw resources and improve the environment and soil pollution caused by straw burning. There into, the straw recovery can provide high quality feed for livestock and reduce the excessive dependence on pasture, so this tech
11、nique has important practical significance to our countrys increasingly developing animal husbandry and related industries.2. Overall Institutions and Main Technical Indicators2.1. Whole Structure and Work PrincipleAs shown in figure 1, 4YQZ-3A combine harvester for corn is mainly made up of grippin
12、g delivery mechanism, spike picking device, stem shredding mechanism, cast cylinder, spike collecting box, stem crushing box, counters-field device and helicinae and delivery apparatus of stalks, etc. This machine can once completed the picking, rising and transportation, setting into the box, stalk
13、s cutting, conveying, chopping, throwing and collection and root crop crushing of corn grain. While the machinesk is operating, nearside divider subdivided maize plants, reciprocating cutter cut the plants, clamping chain clamps maize plants of which root is sundered and then convey them to vertical
14、 spike-picking roller to pick off the ear, the corn ear are conveyed to the spike collecting box by the delivery mechanism; Stalks are chopped by vertical hob behind the stem pulling roller , and then are casted by casting device to stem crushing box; and corn root are broken by counters-field devic
15、e.2.2. Technology Index of the MachineAccording to the requirements of the chopping and ensiling craft of the corn stalks and the function characteristics of the prototype requirements, The main technical parameters are determined as is shown in Table 1.Table 1. The main technical parameters of 4YQZ
16、-3A combine harvesterParametersNumerical valueParametersNumerical valueBoundary dimension (lengthwidthheight)/mm710025003600Minimum groundclearance/mm210Entire machine weight/kg5090Revolving speed of spike Picking roller/rmin-11080Mating Power/kW88.2Revolving speed of Stalkschopping machine/rmin-121
17、00Number of Harvest rows/row3Forward speed of the havester/kmh-11.33.5Adapted line spacing/mm500800Theoretical productivity/hm2h-10.638Figure 1.4YQZ - 3 of maize united harvest machine structure schematic drawing3. Main Working Parts Design3.1 Gripping Delivery MechanismAs figure 2 shows, gripping d
18、elivery mechanism are mainly made of positivefeeding chain, passive sprocket, tension device, clamping board, conveying chain and drive sprocket,etc. When the machine are working, milpa are devided and lifted up by nearsidedivider, and then drive sprocket are driven by passive sprocket and force fee
19、ding chain to run, so as to turn milpa to gripping delivery chains, In the meanwhile, cutterbar cut off the maize plants, the broken plants conveying chain and conveying dial gripping under the common function of bluegrass chain conveyor back into pick spike roller; Tension device is used to adjust
20、the tensioner degree of the conveyor chain so as to make the clamping stalks of clamping conveying chain more stable and reliable.3.1.1. Positivefeed ChainPositivefeed chain is located below the nearsidedivider ,dedicated to cooperating with it to force-feed the corn plants with different Line spaci
21、ng. The selection of the speed of positivefeeding chain have a great effect on plants clamping transmission. Excessive speed will make plants clamping feeding within the same lines, causing the phenomenon such as stem being cut off or jamed occur; however, the low speed may make the function of Feed
22、ing chain disapper.Figure 2. Shetch of gripping delivery mechanism1.positivefeeding chain 2. Passive sprocket 3. Tensioningdevise 4. Gripping board 5. Conveyor chainTheoretically, the speed of the positivefeeding chain, the level points speed should be equal to , ,the marching speed of the machine ,
23、 but in actual work process, the influence factors of the speed of positivefeeding chain include: m v_ , thefront rake of positivefeeding chain, _ , aperture has forcedfeeding speed chain of Angle, before, and conditions, etc.In order not to make the machine push down the stem when it ismarching, th
24、e level points speed of the positivefeeding chain should be greater than ,the marching speed of the machine.Figure 3. Velocity decomposition of conveying chain3.1.2 Gripping Delivery ChainWhile Gripping conveying chain is working, it is necessaryto ensure that the cutted plants are transported to sp
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