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Fan X.,Jilin University | Fan X.,Jilin Province Academy of Agricultural Machinery | Jia H.,Jilin University | Zhang W.,Jilin University | And 3 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

Work principle of a new anti-blocking mechanism for no-till planting was described. Equations about the trajectory, the absolute velocity and the acceleration of any vertex on the finger wheel were deduced. Associated graphics were constructed by software, and parameters of the device were analyzed. The results indicated that the movement angles δ was chosen between 20°-40° and had great influence on working width compared with radius of the finger wheel. Backward inclined distribution should be adopted for the finger.


Jia H.,Jilin University | Huang D.,Jilin Agricultural University | Liu X.,Jilin University | Wang Z.,Jilin Agricultural University | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

In order to make the universal blade meet the requirements of ridge stubble-breaking or full-width rot tilling, reduce the power consumption and make the forces acting on the rotor more evenly, a symmetrical multi-spiral arrangement method for the tillage blade on the horizontal rotor was presented. The blade rotor was divided into two equal rotors, a right rotor and a left one, on which the blades were arranged in a multi-spiral way. The spirals on the two rotors were in opposite directions, but the lift angle of the spiral on two rotors were the same. The blades on the same spiral were in the same bending direction, and those arranged on adjacent spirals were in the opposite bending direction. The bending direction of the blades on the blade disc of the right rotor was opposite to that in the corresponding position on the symmetrical blade disc of the left rotor. Test results of several different rotary tillage machines adopting the arrangement method in rot tilling and stubble-breaking operations showed that the average soil-breaking rate was higher than 85.6% and the average stubble-breaking rate higher than 80%. The use of the arrangement method in the rotary tillage machines can reduce shock and vibration, prolong the service life of the transmission part and increase the operating stability of the machines.


Jia H.,Jilin University | Guo H.,Jilin University | Guo M.,Jilin University | Wang L.,Jilin University | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

The soil coverer and the press wheel are the main parts of the corn planter, and their performances are directly related to the growth and the output of the corn. The operation of soil compaction immediately after the soil covering can improve the soil moisture content and reduce soil evaporation. The application of elastic material in the press device also has a positive effect on solving the phenomenon of soil adhesion during the operation of seeding. In order to improve the performances of seeding and soil compaction of the corn planter under conservation tillage, an elastic press wheel with the function of covering soil was designed through the combination of the deformation theory of rubber material and the tire mechanics to solve soil covering and soil compaction simultaneously after corn planting. The force of contact unit during the operation process of press wheel was analyzed, a theoretical model of the press wheel was built up based on shape characteristics of furrows, and an elastic press wheel with a double-cavity structure was presented. Depending on the extrusion force caused by the contact between the lateral edge of press wheel and furrows realize the functions of soil covering and soil compaction simultaneously. The structural parameters of the elastic press wheel with the material of styrene butadiene rubber (SBR) was determined through the analysis of the theoretical mode as follows: the diameter, the width and the thickness of the press wheel were 500, 180 and 8 mm, respectively; the width of cross section of single-cavity of the press wheel was 70 mm, the cross section of single-cavity of the press wheel was composed with the curvature radius of the lateral edge of the press wheel respectively ρ1, ρ2 and ρ3, which were 30, 135 and 60 mm separately; the internal pressure of the press wheel was 500 Pa, and the external load during working was 475 N. The theoretical model was confirmed by the finite element simulation based on ABAQUS through analyzing the stress, strain and displacement of soil, contact area and vertical contact force. The simulation results showed that the elastic press wheel could realize these objectives of soil covering and soil compaction with less disturbance of the soil and better working stability. A field experiment was conducted to validate the theoretical model and the elastic press wheel's functions of soil covering and soil compaction, and the results showed that the soil covering depth of seed after compacting operation was 34 mm, the coefficient of variation of the seed's soil covering depth after compacting operation was 15.68%, the soil compactness was 33.54 KPa in the top 50 mm soil layer of the seed furrow, and the coefficient of variation was 13.97%, which indicated that the elastic press wheel would work effectively in the functions of soil covering and soil compaction. An additional comparative experiment was carried out between the elastic press wheel presented in the paper and the double-disc coverer and rubber press wheel widely used in precision planter, and the desired soil covering depth of seed was both obtained in the corn planting, but the corn planter equipped with elastic press wheel worked more effectively in the functions of soil compaction, and our result indicated that the corn planter equipped with elastic press wheel could also result in good performances on the stability of soil covering and soil compaction. Therefore, this method and the theoretical model are demonstrated to be practical and feasible, and the elastic press wheel presented in the paper can achieve the expected target of the soil covering and soil compaction with good performance of working stability. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.


Ji W.,Jilin University | Jia H.,Jilin University | Tong J.,Jilin University | Tan H.,Jilin Province Academy of Agricultural Machinery | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2010

Power consumption (torque) tests of a single universal blade for rototilling and stubble breaking were conducted in the soil bin, to investigate the influences of the tillage depth and rotary speed of the blade as well as the working speed of the machine on power consumption. The regression equations for the relations between power consumption and the above parameters were established. Soil bin tests indicated that the parameter that had significant influence on power consumption is the rotary speed, next is the tillage depth, and the working speed had less influence. Then the universal blades were mounted on the bionic intelligent rototilling-stubble-breaking machine to perform rototilling and stubble-breaking tests respectively. Field tests showed that the stability of the tillage depth is over 93%, stubble-breaking rate, stubble coverage rate and soil-crushing rate are 81.8%, 87.2%, 87.9% on average, respectively, which meets the agrotechnical requirements.


Gu Y.,Jilin University | Gu Y.,Jilin Province Academy of Agricultural Machinery | Jia H.,Jilin University | Guo H.,Jilin University | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

Twelve kinds of sliding knife furrow openner with different thickness and sliding cutting angle were designed in view of this issue about the casualness in the design and manufacture and limited application. Mixed type orthogonal test was carried out through soil bin and press in the laboratory with test index of traction resistance and vertical pressure. The test results showed that the sliding cutting angle was the main factor effecting its working performance, and the furrow opener possessed better comprehensive performance when its sliding cutting angle in the edge curve terminal point was in the range of 35°-55°.


Jia H.,Jilin University | Wang L.,Jilin Agricultural University | Li C.,Jilin Province Academy of Agricultural Machinery | Tan H.,Jilin Province Academy of Agricultural Machinery | Ma C.,Jilin University
Soil and Tillage Research | Year: 2010

The stalk-stubble breaking and mulching process is a core technique for some conservation tillage system. Over the past 10 years, this technique has been widely adopted in the dry farming area of northern China. On the basis of analyzing the existing problems in stalk-breaking and stubble-breaking machines, we have developed a combined stalk-stubble breaking and mulching machine with two frames fixed together, the stalk and stubble-breaking blade rotors were mounted respectively on the frames. The machine can be used to break the maize (Zea mays L.) stalk and stubble and bury about one-third of the broken stalk and stubble in the soil, preventing them being blown away by wind. This paper describes the structural features of the machine, the design of main working parts, determination of the parameters of the central position of the two blade rotors, and presents the performance test results. The tests showed that the machine had a stalk-breaking rate of 89% and the vegetation coverage rate reached 67.9%, which meets the agro-technical requirements in the dry farming area of northern China. © 2010 Elsevier B.V. All rights reserved.

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