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Kang J.,Chinese Academy of Agricultural Sciences | Kang J.,Xinjiang Academy of Agricultural and Reclamation Science | Li S.,Chinese Academy of Agricultural Sciences | Yang X.,Chinese Academy of Agricultural Sciences | And 4 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2017

Aiming at the problem of that the power consumption of disc type ditcher is difficult to test, a virtual test platform evaluation disc type ditcher set power consumption method was proposed. Firstly, the dynamics model of disc type ditcher was established. In order to shorten the operation time, the secondary characteristics such as chamfer, fillet and connection were omitted. The boundary conditions and loads were set up. The virtual simulation of power consumption in disc type ditcher was carried out with trenching depths of 400 mm and 500 mm, forward speeds of 0.8 km/h and 1.5 km/h, rotation speeds of 180 r/min and 220 r/min, respectively. The power curve of ditch process showed that at the beginning of soil cutting, power consumption was increased quickly, the reason for which was a great deal of power consumption was needed during the process of soil deformation and broken. After that the power consumption was tended to be stable, for the reason of which was the binding force was tended to be less after the soil particle was destroyed. Then the field power test system was built and the relative errors were 6.88% and 7.73%, respectively, compared with simulation results. The accuracy and feasibility of the proposed method were verified. Finally, totally 18 conditions (three trenching depths, two forward speeds, and three rotating speeds) were selected to carry out the simulation. The results showed that with a certain trenching depth, the disc type ditcher had an increasing linear relationship with forward speed and rotation speed. With a certain ditching depth and forward speed, the lowest power consumption was appeared at rotation speed of 200 r/min. Moreover, with a large trenching depth and forward speed, the effect of rotation speed on power consumption was obvious. When the rotary speed was 200 r/min, both low and high speeds, disc type ditcher had the lowest power consumption value. According to comparison at rotary speed of 219 r/min in different ditching depths and forward speeds, the power consumption at rotary speed of 200 r/min was decreased by 8.5 kW, 9.6 kW and 4.6 kW, the results provided a theoretical basis for power consumption measurement of rotary ditcher. © 2017, Chinese Society of Agricultural Machinery. All right reserved.


Zhang T.,Modern Agricultural Equipment Co. | Dong X.,Chinese Academy of Agricultural Sciences | Yin S.,Chinese Academy of Agricultural Sciences | Yang X.,Chinese Academy of Agricultural Sciences | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2016

Lightweight high clearance boom sprayer with air-assisted system was designed to develop efficient pesticide application technologies for soybean at middle and later growing stages. The sprayer wheel tread can be adjusted from 1600 mm to 1750 mm, ground clearance was 800 mm, wheel base was 2000 mm, spray span was 8000 mm. Various soybean field experiments were conducted to measure the performance of air-assisted spraying system on lightweight high clearance boom sprayer. The experiment results showed that when the operating speed was 4 km/h, droplet coverage rate of the positive soybean leaves surface was increased by 19.0 percentage points in upper canopy and 17.0 percentage points in middle canopy, while that in lower canopy was increased by less than 5.0 percentage points through improving the spray pressure. Droplet coverage rate of back soybean leaves surface was increased by 5.5 percentage points in upper canopy and 2.3 percentage points in middle canopy, and that in lower canopy was increased by less than 1.0 percentage points. Droplet coverage rate by using ST110-05 nozzle was improved by 21.0 percentage points, 26.0 percentage points and 10.0 percentage points compared with that by using ST110-03 nozzle on the positive soybean leaves surface in upper, middle and lower canopies, respectively. Droplet coverage rate by using ST110-05 nozzle was increased by 5.0 percentage points and 1.0 percentage points in comparison with that by using ST110-03 nozzle on the back soybean leaves surface in upper and middle canopies, respectively, and no significant influence on lower canopy. When the air speed of curtain was 11.5 m/s, the air-assisted system could make the droplet coverage rate of positive soybean leaves surface increase by 26.8 percentage points and 22.0 percentage points in middle and lower canopies, respectively. The droplet coverage rate of back soybean leaves surface was increased by 23.1 percentage points, 18.1 percentage points and 8.4 percentage points in upper, middle and lower canopies, respectively. The assisted air flow had strong penetrability which was shown in the droplet coverage rate on positive and back leaves surfaces, and improved the distribution uniformity in soybean canopies. However, the droplet loss rate on the ground was increased. © 2016, Chinese Society of Agricultural Machinery. All right reserved.


Miao Z.,Shanghai University | Chu J.,Shanghai University | Liu C.,Shanghai JiaoTong University | Han Z.,Modern Agricultural Equipment Co. | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

A digital intelligent monitoring system based on CAN bus was constructed. Based on CAN 2.0B frame structure, the principle and method of the CAN bus application-layer protocol constitution were addressed by analyzing the message identifier of extended superframe. The CAN bus application-layer protocol of monitoring system suited for cotton-picking machine was proposed. This protocol was applied on the prototype of cotton-picking machine. The experiment results showed that the proposed protocol not only met the need of intelligent monitoring system, but also be characterized by good portability and scalability. The research results can also be applied in other agricultural and engineer machinery.


Zhang Z.,China Agricultural University | Han Z.,Chinese Academy of Agricultural Sciences | Li S.,China National Machinery Industry Corporation | Hao X.,Modern Agricultural Equipment Co. | Wang C.,Modern Agricultural Equipment Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2016

In order to study the influence of relative setting position between reciprocating cutter and nip point of gripping chains and the growth direction of corn ears on corn harvesting performance, a new gripping device of corn combine harvesting of corn stalk and ears in the cramping-cutting-transporting type was designed. A rice special agricultural chain was used to replace the gathering chain and gripping chain of gripping device in original corn combine harvester. The theory of dividing, dialing and gripping corn stalk was analyzed. Recurdyn software was employed to build a rigid-flexible system with corn stalk as flexible part and cutting-grapping device as rigid element. The effect of five horizontal distances between reciprocating cutter and nip point of gripping chains and three growth directions of corn ear on motion of ear growth point were simulated. The five distances were -70 mm, -35 mm, 0 mm, 35 mm and 70 mm, respectively, and the three directions were separately machine forwarding direction, opposite and vertical to forward directions. The simulation results showed that both the growth direction of corn ears and relative distance had effect on motion of corn plants. When the horizontal distance was -70 mm and -35 mm, corn plants were cut with no cramping, they would incline to the direction of corn ear growing; when the distance was 0 mm, 35 mm and 70 mm, corn plants were cut with cramping and they would move with gripping chains. A corn combine harvester for stalk and ears was designed and manufactured to test the performance of cutting and gripping device with horizontal distance of -70 mm and -35 mm in the field. Field tests were made at machine working speed of 1.2 m/s and gripping chain speed of 1.39 m/s. The results indicated that when the horizontal position of cutter relative to the nip point of grip chains was -70 mm, the total plant loss was 36.2%, while it was 3.3% with the position of 35 mm. This verified that cutting with gripping could greatly reduce the grain harvesting loss, and it proved that the simulation analysis was reasonable and reliable. This study illustrated corn combine harvester for stalk and ears in the cramping-cutting-transporting type needed to cut with gripping and provided a basis for design of corn combine in this type. © 2016, Chinese Society of Agricultural Machinery. All right reserved.


Liu L.,Modern Agricultural Equipment Co. | Liu Z.,Modern Agricultural Equipment Co. | Yang X.,Chinese Academy of Agricultural Sciences | Li C.,Modern Agricultural Equipment Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

The 2BMG-24Q pneumatic no-till wheat planter was designed. Seeds were transported into seeder pipes with high-speed air current to perform precision metering. The wavy disc coulters were used to cut stubble for sowing, and the double disc coulters were used to open furrow for fertilizing. The test results showed that the quanlification percent of seed depth and fertilizer depth were 88.3% and 85.2%, respectively.


He Y.,Chinese Academy of Agricultural Sciences | He Y.,Modern Agricultural Equipment Co. | Li S.,Chinese Academy of Agricultural Sciences | Yang X.,Modern Agricultural Equipment Co. | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

The application of mechanical transplanting on crops can effectively increase the product of crops and reduce the labor intense as modern cultivation techniques. But the popularization and application are limited by the problem of lower upright degree to some certain extent. A new type cam-swing link type transplanting machinewas designed to solve the problem of lower upright degree in current pot seedling planting machine. In addition, the receiving seedling stability of planting apparatus can be guaranteed well, owing to double parallel four-bar mechanism of this planting machine. In this paper, the kinematic model of the transplanting machine was established, including the equations of planting trajectory, planting velocity and planting acceleration for the planting device. For the purpose of high efficiency, interactive GUI design tool had been explored based on the MATLAB/GUI according to these mathematic equations. The influences on the transplanting trajectory of main parameters were analyzed based on MATLAB tool, including the length L1 and original phase angle Φ 1 of crank CD, the length L2 and original phase angle Φ 2 of swing AB, and the length L5 of link AG. The system parameters which had great effects on the planting trajectory were L1, L2, Φ 1 and Φ 2. These parameters were analyzed and optimized through the method of orthogonal experiment. The experimental scheme was designed according to orthogonal table off our factors and three levels. By analyzing the range table of residual, the parameter couldbe ranged as L2, L1, Φ 1 and Φ 2 from big to small, considering the degree of significant on upright degree of seedlings. The optimal combination could be selected that L1 is 118 mm, L2 is 52 mm, Φ 1 is 256°, and Φ 2 is 316°. Under the condition of this optimal combination, the motion model of transplanting machine was reestablished to generate a new optimized planting trajectory. The top of this trajectory was smooth to benefit the receiving seedling stability of planting device. As the total height of this trajectory was about 256 mm with 190 mm higher the ridge side, the planting device couldavoid touching down seedlings planted effectively. When the planting depth reached 60 mm, the maximum residual of curve at planting seedlings parts was 0.465 mm, the mean residual was 0.253 mm, and penetration angel was 81.05°. The simulation results indicated that this optimized planting trajectory can improved the anteversion problem of seedlings that caused by compaction wheel and ensured the seedling planted higher upright degree. In order to verify the reasonability and accuracy of the theoretical model, the prototype was processed with the optimized parameters. Based on the prototype, field tests were carried out according to relevant standards in Yiyang county industrial park of China in March 2015. No crops were planted and the ridge film was mulched in the test plot before the testing, for simply obtaining test results without effects of the other crops. During the course of experiment, 30 horse-power tractor was selected as the only power. The total height of seedlings used was no more than 150 mm, and the height of seedlings substrate less than 60 mm. The plant vertical degree was considered as the main optimization indicator which influenced by the main parameter smentioned above. The data results showed that the mechanism proposed meet the requirements of pot seedling agricultural plant at the speed of 0.556 meter per second, and planting frequency was 60.7 plant percent minute. The qualified rate of upright degree with the variationco efficient of 2.03% was 95%, lodging rate was no more than 1.67%, and plant spacing error rate was only 0.22% with no lacking of seedlings. The results indicated that this machine had the good planting performances of high upright degree and low spacing error rate under the condition of high efficiency of planting. What this paper studied will provide theoretical reference for the subsequent transplanter research and development. © 2016, Chinese Society of Agricultural Engineering. All right reserved.


Wang J.,Chinese Academy of Agricultural Sciences | Dong X.,Chinese Academy of Agricultural Sciences | Yan H.,Chinese Academy of Agricultural Sciences | Zhang T.,Modern Agricultural Equipment Co. | Zeng Y.,Modern Agricultural Equipment Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

Air-assisted spraying technique research was carried out to increase pesticide efficiency and decrease pesticide loss. The spraying performance was experimentally studied on model 3WQ-3000 trailed air-assisted boom sprayer in small bell stage of corn fields. The effects of four sizes of flat fan nozzles (ST110-02, ST110-04, ST110-05, ST110-06) with air curtain on pesticide efficacy, coverage rate and loss rate were carried out. The experiment results showed that the deposition amount was large at upper part of corn canopy and small at lower part. Air curtain enhanced penetrability, deposited property of droplets and improved the uniformity of distribution at corn canopies. Air-assisted sprayer had significant influence on small size droplets VMD that the pesticide efficacy of ST110-02 flat fan nozzle with air curtain was 83% more than that without air curtain. The optimum pesticide efficacy of ST110-06 flat fan nozzle with air curtain was 41.93%. Air curtain could increase pesticide loss rate on the ground. The best loss rate of ST110-02 flat fan nozzle without air curtain was 13.05%. Compared with the conventional sprayer, the new air-assisted sprayer had better droplet coverage rate and higher penetrability, the average pesticide efficacy was improved by 144.17%, and pesticide loss rate on the ground was reduced by 14.46%. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.


Zhao Z.,Modern Agricultural Equipment Co. | Liu Y.,Modern Agricultural Equipment Co. | Liu Z.,Modern Agricultural Equipment Co. | Gao B.,Menoble Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

In order to solve the problem of high reseeding, miss-seeding and instability issue in the vegetable tray precision seeder, the seedling performance was detected in the tray precision seeder based on machine vision technology. The performance detective device was setting in the tray precision seeder. Double-camera took tray images one by one after the tray was detected by photosensor, and then these images were transferred to the computer in real-time. The images were processed and analyzed by the vision algorithm software, the seeds could be seen in the tray and the results and photos were displayed on the screen together. The test showed that the reseeding detection accuracy was 98.94% and miss-seeding detection accuracy was 99.33%. ©, 2014, Chinese Society of Agricultural Machinery. All right reserved.


Chen K.,Modern Agricultural Equipment Co. | Yang X.,Modern Agricultural Equipment Co. | Yan H.,Modern Agricultural Equipment Co. | Guo Y.,Modern Agricultural Equipment Co. | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

An automatic transplanter mechanism was designed. According to the mechanism principle, the corresponding mathematical model was built. Relationship of each parameter in the proposed model was analyzed. For the different types of seedling trays, Matlab was used, which optimized the structural parameters of the model. The proposed seedling pick-up mechanism met the design demands of opening-closing in a given range and clamp for seedling substrate.


Teng S.M.,Modern Agricultural Equipment Co. | Kang Z.,Chinese Academy of Agricultural Sciences | Wang Y.Y.,Modern Agricultural Equipment Co. | Shao H.Y.,Modern Agricultural Equipment Co. | Zhang C.P.,Modern Agricultural Equipment Co.
Applied Mechanics and Materials | Year: 2014

For the quality control of developed small batch manufacturing mode, a method based on stochastic weighted theory is proposed to optimize control parameters of control charts. The small sample data is sampled again by stochastic weighted method to obtain more information. Then, the sample data’s distribution parameters are estimated. After the estimated distribution parameter are tested, control parameters of control charts could be optimized dynamically. The method improves deficiencies of traditional control charts under low-volume production and realizes the quality control of small batch manufacturing. Experiments show that the optimized control parameters approach theory true values and are better than the traditional control charts’ control parameters. Therefore, the proposed method is fit for the quality control of small batch manufacturing. © (2014) Trans Tech Publications, Switzerland.

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