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1、精选优质文档-倾情为你奉上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 )资料个人收集整理，勿做商业用途AbstractDue to the problem of the low retrieving rate of straw while harvesting, fodder went sort

2、 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 and chopping

3、 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 corn stal

4、k and spike well.资料个人收集整理，勿做商业用途Keywords- corn harvester; picking and threshing harvester; design;Experiment资料个人收集整理，勿做商业用途1.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 nutri

5、ent component, etc. 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 sta

6、lks within one time, 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, i

7、t has not been rapidly 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.

8、资料个人收集整理，勿做商业用途Foundation item: Public beneficial(agriculture)Science research fund issue(9-04)资料个人收集整理，勿做商业用途On the basis of the tenth-five national research tackle key problems in science and technologyresearch, in this article 4YQZ-3A combine harvester was designed, which combines existing corn h

9、arvest and corn silage mechanization technique and improves the design and optimizes the combination for each working device. During the of harvest cornear, the 4YQZ-3A combine harvester can also complete cutting, conveying, chopping collection and root crop broken tasks and so on; With the populari

10、zation and appli-cation of this technique , 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. Thereinto, the straw recovery can provide high quality feed for livestock and reduce the excessi

11、ve dependence on pasture, so this technique has important practical significance to our countrys increasingly developing animal husbandry and related industries.资料个人收集整理，勿做商业用途2. Overall Institutions and Main TechnicalIndicators资料个人收集整理，勿做商业用途2.1. Whole Structure and Work PrincipleAs shown in figure

12、 1, 4YQZ-3A combine harvester for corn is mainly made up of gripping 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

13、the picking, rising and transportation, setting into the box, stalks cutting, conveying, chopping, throwing and collection and root crop crushing of corn grain. While the machinesk is operating, nearsidedivider subdivided maize plants, reciprocating cutter cut the plants, clamping chain clamps maize

14、 plants of which root is sundered and then convey them to vertical 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 s

15、tem crushing box; and corn root are broken by counters-field device.资料个人收集整理，勿做商业用途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

16、 determined as is shown in Table 1.资料个人收集整理，勿做商业用途Table 1. The main technical parameters of 4YQZ-3A combine harvester资料个人收集整理，勿做商业用途ParametersNumerical valueParametersNumerical valueBoundary dimension (lengthwidthheight)/mm710025003600Minimum groundclearance/mm210Entire machine weight/kg5090Revolvin

17、g speed of spike Picking roller/rmin-11080Mating Power/kW88.2Revolving speed of Stalkschopping machine/rmin-12100Number of Harvest rows/row3Forward speed ofthehavester/kmh-11.33.5Adapted linespacing/mm500800Theoreticalproductivity/hm2h-10.638Figure 1.4YQZ - 3 of maize united harvest machine structur

18、eschematic drawing资料个人收集整理，勿做商业用途3. Main Working Parts Design3.1 Gripping Delivery MechanismAs figure 2 shows, gripping delivery mechanism are mainly made of positivefeeding chain, passive sprocket, tension device, clamping board, conveying chain and drive sprocket,etc. When the machine are working,

19、 milpa are devided and lifted up by nearsidedivider, and then drive sprocket are driven by passive sprocket and force feeding 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 grip

20、ping under the common function of bluegrass chain conveyor back into pick spike roller; Tension device is used to adjust the tensioner degree of the conveyor chain so as to make the clamping stalks of clamping conveying chain more stable and reliable.资料个人收集整理，勿做商业用途 Positivefeed ChainPositivefeed ch

21、ain is located below the nearsidedivider ,dedicated to cooperating with it to force-feed the corn plants with different Line spacing. 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

22、same lines, causing the phenomenon such as stem being cut off or jamed occur; however, the low speed may make the function of Feeding chain disapper.资料个人收集整理，勿做商业用途Figure 2. Shetch of gripping delivery mechanism1.positivefeeding chain 2. Passive sprocket 3. Tensioningdevise 4. Gripping board 5. Conv

23、eyor chain资料个人收集整理，勿做商业用途Theoretically, the speed of the positivefeeding chain, the level points speed should be equal to , ,the marching speed of the machine , but in actual work process, the influence factors of the speed of positivefeeding chain include:m v_ , thefront rake of positivefeeding cha

24、in, _ , 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,the level points speed of the positivefeeding chain should be greater than ,the marching speed of the machine.资料个人收集整理，勿做商业用途Figure 3. Velocity

25、decomposition of conveying chain资料个人收集整理，勿做商业用途3.1.2 Gripping Delivery ChainWhile Gripping conveying chain is working, it is necessaryto ensure that the cutted plants are transported to spike pickingroller timely and reliable, and maintained a certain distance between the transported plants, to make

26、 spike picking roller load evenly.During Work, select maize plants to make velocity analysis in dot o in gripping chain, just as fig. 3shows.w v , its absolute velocity is induced as follows:资料个人收集整理，勿做商业用途 (1)(2)Where: the speed of gripping chain ;And by: (3)By type (2) and (3) we know that: (4)Kno

27、wn by Type (4) ,While ,the absolute velocity,point in the direction of clamping chain (bacward) and make Angle with horizontal line; While, Absolute speed and stalks will move forward a certain angle, which will go against conveying the corn plants smoothly. Combined with the performance testing of

28、gripping conveying in the field , when the size of belongs to 1020，this is the best situation.资料个人收集整理，勿做商业用途3.2 Vertical Picking and Chopping CutterVertical picking and chopping cutter is a critical component of picking both spike and stem , as shown In figure 4 , this device is mainlymade up of a

29、Vertical spike picking roller, fixed knife, moving knife, Chopping cylinder.etc.资料个人收集整理，勿做商业用途Figure 4. Vertical picking and chopping cutter1.Vertical spike picking roller 2.Vertical stem pulling roller资料个人收集整理，勿做商业用途3.Moving blade 4.The fixed knife 5.Chopping cylinder资料个人收集整理，勿做商业用途3.2.1 The Schem

30、e of Power DriveThe Scheme of Power Drive of Vertical picking and chopping cutter is shown in figure 5 .When it works, power driven by engine slow down to the input axis of chopped gearbox through the pulleys and double sprocket , the power drive shredding mechanism to run through a set of bevel gea

31、r; left behind the chop gearbox there are a group of driving chain (chainwheel of middle size and large size) transmit the power to spike picking chopped gearbox and then divide the power to stem pulling roller ear the bevel gear of the speed changing box; Above the stem pulling roller and spike pic

32、king are a group of driving chains, the power is transmitted from stem pulling roller to spike picking roller to pick the spikes. In The input axis of the spike picking gearbox lies the small chainwheel and pulley,it functions as transmitting the power to cluster transportation reciprocating type cu

33、tter.资料个人收集整理，勿做商业用途3.2.2 Vertical Spike Picking RollerVertical spike picking is completed while corn ear are drooping, compared to the average Horizontal spike picking, the picked cluster can quickly break away from spike picking roller, greatly reduce the breakage rate and the loss rate of grain.

34、In order to strengthen the ability stem pulling and spike picking, behind the spike picking roller are in pairs stem pulling roller , can pull stem while stalks, force feeding the stalks to hobbing cutter to chop,make the conveying of stalks unobstructed and not jam between the spike picking roller

35、and hobbing cutter. The plane lies in the two Axis of vertical spike picking device and its vertical plane forerake the degree of 25􀌚35, maize plants enter into verticalspike picking roller pick spike through grippingconveying feeding device by gripping. Plant in arc blockunder the effect o

36、f arc-shaped bluegrass board with picking spike into 50 roller line 70 Angle. Due to the ascension of spike picking roller, between the plants of which spike are picked and spike picking roller there exist a vertical Angle and the plants are transported backward to chopping cylinder to chop.资料个人收集整理

37、，勿做商业用途Figure 5. sketch of power drive1.Pulley 2.Big sprocket3.Small sprocket4.Spike picking gearbox资料个人收集整理，勿做商业用途5.Chopping gearbox 6.Double sprocket 7.Middle sprocket资料个人收集整理，勿做商业用途After plenty of indoor performance test, this design determines the diameter of vertical spike picking roller as 84m

38、m,the speed of the spike picking roller is 1080r/min.资料个人收集整理，勿做商业用途3.2.3 Chopping Cylinder(1) the determination of the feeding entrance width资料个人收集整理，勿做商业用途The productivity of the stalks chopping are calculated bythe following type :资料个人收集整理，勿做商业用途(5)Where:Q Productivity of the design, the value is

39、30000kg/h;资料个人收集整理，勿做商业用途KcFill factor of the feeding stalks, the value is 0.6; 资料个人收集整理，勿做商业用途lChopping length, the values is 25mm;The numberof moving blade, and design thevalue for four pieces;资料个人收集整理，勿做商业用途Speed of mainshaft, and design the value for2100r/min;资料个人收集整理，勿做商业用途YcUnit weight of stal

40、ks after campaction, and designthe value for400 kg/m3;资料个人收集整理，勿做商业用途b The feeding entrance length, design the value for510mm.资料个人收集整理，勿做商业用途Substitue the above data into the above type,we obtained: a = 1.96 mm , in this design we select a = 20mm.资料个人收集整理，勿做商业用途(2) The determination of the chopping

41、cylinderThe chopping cylinder diameter are obtained by the following type:资料个人收集整理，勿做商业用途 (6) (7)Where: Dthe chopping cylinder diameter;vLinear velocity in the two endpoint of the blade line of the moving blade资料个人收集整理，勿做商业用途Moving blade line two endpoints, design value for linear 25m/s; The choppin

42、g cylinder speed, the design value is 2100r/min.资料个人收集整理，勿做商业用途Substitue the above data into the above type we obtained that the chopping cylinder diamete is 227mm, in this design we select chopping cylinder diameter for 680 mm.资料个人收集整理，勿做商业用途3.3. Helicinae and Throwing ApparatusAs Figure 6 shows, h

43、elicinae and throwing apparatus is mainly comprised of auger conveyor, throwing impeller and throwing canister, etc. And the auger conveyor is mainly made up of plummer block, augering trough, augering axle, augering blade and augering axle pulleys, etc.资料个人收集整理，勿做商业用途Basic Dimensions for Auger Conv

44、eyorAuger conveyor pass through the bottom of the driving cab,according to operating requirements ,make augering trough L= 720mm augering axis diameter d = 60mm , augering blade diameter r = 270mm, Screw torque S = 250mm资料个人收集整理，勿做商业用途Figure 6. Sketch of helicinae and throwing apparatus资料个人收集整理，勿做商业

45、用途1. Plummer block 2. Augering trough 3.Augering axle资料个人收集整理，勿做商业用途 4. Augering blade5. Impellerseaming 6.Impeller shaft资料个人收集整理，勿做商业用途4. Feld Experiment and Analysis of theResults4.1 Test ConditionWe chose click on ChangYi farm, WeiFang city, ShanDong province as the Test site .The Plots are a no-

46、till seeding Corn land in one year two ripe area. The row spacing are 275mm, line spacing are 650 mm, the corn plant height are2520mm and the stem diameter is 25 mm, the lowest height for ear are 920mm, bending rate is 2.6%, plant lodging rate is less than 2%, cluster prolapse rate is 2%, maize yiel

47、d rate is 5912kg / hm2, moisture content of the stalks is 75%.资料个人收集整理，勿做商业用途4.2 Test MethodAccording to the quality inspection index of the harvestquality of corn combine established by the masterstation of farm machinery test of Ministry of Agriculture, performance test content of harvest quality

48、includes the forward speed of the machine, kernel lossing rate, cluster lossing rate, kernel crushing ratio, working productivity, etc. the main inspection factors are the test program of corn harvest machine and the test items and test method of corn harvest machine 14-15.资料个人收集整理，勿做商业用途4.3 Test Results and AnalysisDuring the test process ,the prototype operates smoothly,safely and reliably, the working parts can effectively completed p