Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment

Changsha, China

Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment

Changsha, China

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Tang C.,Hunan Agricultural University | Tang C.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Wang H.,Hunan Agricultural University | Li M.,Hunan Agricultural University | And 7 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Breeding is an important process of hybrid rice production. Pollination is the key link of breeding, which effect the production and economical efficiency obviously. The status of pollination equipments and technologies at home and abroad were reviewed. There were two types of pollination techniques with collision type and slipstream type based on the working principle, the features and the shortcomings of which were summarized. The problems of pollination equipment, such as pollination nonuniformity, plant scathing, resulted into pollinating blindly and randomly. Hybrid rice production should be oriented toward mechanization and multifunction. The strategies of different kinds of pollinating scientifically and applicatively, and the methods of obtaining reasonable working parameters and avoiding interbreeding and developing applicable pollination machines were explored.


Luo Y.-H.,Hunan Agricultural University | Luo Y.-H.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Jiang P.,Hunan Agricultural University | Jiang P.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | And 2 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

To develop a location system for small agricultural machines in the Chinese south, a laser emitting and tracking system based on double laser-emitter and three-point location was designed based on the laser three-point theory. The theory of double-laser-emitter and three-point location was introduced; then, the laser emitting and tracking system was designed, including the designs of working mechanism and controlling circuit for the laser emitter. The Kalman filtering algorithm based on a incremental PID with quick correction functions was proposed to estimate the moving targets in laser tracking and to compensate the errors in changing speeds and turning corner of the machine. A series experiments were performed. The experiment results show that the targets of laser receiver can be tracked dynamically by both laser emitters in real-time, and the maximum deviation is ± 2.8 cm, which meets the location requirement of an autotracked-driving farming machine for an accuracy of ± 4 cm within 200 m. For the reliable and effective algorithm, it can lay a foundation for unmanned driving of farmland machines and data collection in farming fields.


Liu D.,Hunan Agricultural University | Xie F.,Hunan Agricultural University | Xie F.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Li X.,Hunan Agricultural University | Wang X.,Hunan Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

Lifting platform in orchard is of great importance to the fruit production, because it plays a vital role in the operation links: picking, flower thinning, etc. However, current mechanical devices are not suitable for orchard in the southern hillside area due to the complex terrain. It means low efficiency and the need for more farmers. Mechanization is the only way to change the present situation. Therefore, based on studying and analyzing the collected data of orchard in south China, a miniature self-propelled lifting platform was developed to increase the operation efficiency in orchard in the southern area. The lifting platform was mainly composed of the crawler, scissors elevating mechanism and a multi-function manned worktable. In particular, the manned worktable was designed to realize the real-time leveling through the means of azimuth adjustment, lifting and angle adjustment which were separately driven by revolving support and hydraulic cylinders. In order to maintain stability of the worktable and increase worker's comfort, the secondary leveling was crucial. In order to make the platform has the advantages of small external size, compact structure and easy to assemble, the dimensions of the mechanism and main technical parameters of key parts were optimized based on preliminary experiments. The prototype was made in a machine processing factory and driven directly by a 4.41 kW diesel engine. With the aim to evaluate the performance of the platform, tests of the prototype including climbing angle test, turning radius test, leveling performance test, and stable performance test were carried out in the simulated work environment. The experimental results indicated that the running speed of the prototype was 0.12-0.25 m/s, and the maximum lifting height was 1.2 m, and the turning radius was 0.75-1.34 m, which meet the design requirements and are suitable for the varied working environments. In addition, the simulation results revealed that the static tipping angle of the prototype was between 15°-30° when the platform was equipped with different loads and in various lifting height. Moreover, the mechanism can adjust the inclination angle of the manned worktable through the secondary leveling, which demonstrated that this mechanical platform can be used to work in difficult terrain. But because the distribution of weight is uneven and the chassis touches the ground in a small area, the stability of the whole machine is decreased. All the experiments concluded that the lifting platform met the needs of fruit production and fruit transportation. Meanwhile, with smaller outline size, it is easy to operate and suitable for orchard planting pattern and use requirements in the South. The study provides guidance for the practical production. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.


Xiang W.,Hunan Agricultural University | Xiang W.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Xiang W.,Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China | Wu M.,Hunan Agricultural University | And 7 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

In order to resolve some key issues about the machinery of transplanter for rape seedlings, a new type of transplanter with crawler planting hole forming tools for rape was designed based on the working characteristic in the dry land and agronomic requirement. Research on soil physical and mechanical characteristics were conducted to provide the technical parameters for the design of the hole forming device. First, we completed the whole structure design and analyzed the working principle of the device. The crawler was drove by power system to go forward, on which the hole forming device was installed and synchronously moving. The surface cam was mounted on the chassis. As the caterpillar moved forward, the pore forming device installed on the track vertically stabbed into the soil under the pressure of surface cam supplied by body weight. As the tracks moved forward, the hole forming device was out of the surface cam profiling. As such, a plant hole was formed. We analyzed the curve of surface cam limit, confirmed the limited point so that a coordinate system was established. We then chose the definition curve interpolation method to solve the parameter equation of surface cam profiling combining with Matlab7.0 software plot function in the program and generated surface cam outline curve. For the optimization of punch mechanism of structural design, the surface cam profiling and reset spring control capacity into hole device unearthed vertically. The cylindrical hole was pressured by shearing and extrusion soil. We analyzed the same track number, it had two tracks. Each of them had two linear holes. When the machine moved forward, each side could dig holes in four rows at one time. We installed rolling bearing in the hole forming device for rolling friction instead of sliding friction to reduce friction in the cylindrical hole and the friction between the surface cams. By use of the prototype machine in field, we recorded variables, such as the time, moving distance, distance between holes, the depth of effective planting hole, and the diameter of planting hole. We analyzed indexes such as the rate of qualified hole, hole forming frequency, efficiency, etc.. The result showed that if the machine at lower speed at 1.65-1.78 km/h, the efficiency was up to 0.231-0.249 hm2/h, and the rate of qualified hole up to 93.8% on average. The various performance indicator met the design requirement. The planting and hole forming machine can get holes at 1 400 mm in length each, 50 mm in diameter, 50 mm in depth, and 120000 holes/hm2 in hole density per area. This could get the planting hole to satisfy agronomic requirement. The research provided theoretical and technical references for design of the new type of transplanter. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.


Luo H.,Hunan Agricultural University | Luo H.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Tang C.,Hunan Agricultural University | Zou D.,Hunan Agricultural University | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to solve the problems of harvesting eulaliopsis binata by reciprocating cutter, the single factor test was carried out with the stem of eulaliopsis binata, which include the factors of cutting gap, cutting speed, cutting blade combination, the position and the number of stem cutting etc. Factors and levels of the orthogonal experiment were selected based on the single-factor test, then the stem maximum shear force orthogonal experiment was carried out. The results showed that the cutting gap and the cutting blade combination had greater effect on the shear force, while the cutting speed had less effect. Finally the field comparison tests were completed between the helical tooth-helical smoothing tool combination and the helical smoothing tool-helical smoothing tool traditional combination. The results showed that the helical tooth-helical smoothing tool combination increased 23% cuting rate and reduced 94% wrapping grass rate, which greatly improved the operation quality and efficiency of the eulaliopsis binata cutting.The results indicated that the helical tooth-helical smoothing tool combination for eulaliopsis binata harvest was feasible.


Li M.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Li M.,Hunan Agricultural University | Zhang M.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Zhang M.,Hunan Agricultural University | He J.,HIGH-TECH
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Precision breeding and a local position system (LPS) substitute GPS for field local positioning was proposed in this paper. The system mainly consisted of an omnidirectional vision sensor, artificial landmarks, PC and PC software operating vehicle. The artificial landmarks adopted a primary landmark and three subsidiary landmarks. The algorithm mainly included landmark color pixels beyond threshold which were extracted and divided as a small area based on the Euclid geometrical distance. The center of gravity of the extracted small area was calculated and represented as a position of one landmark. Omnidirectional vision sensor position was estimated according with circumferential theorem and geometric transformation formula based on the direction angles. Experiments were conducted on a level lawn under the sun in a 30 m×30 m rectangular area. Results showed that the distance RMS error between estimated position and test position was about 15 cm. The system is feasible for precision breeding such as field positioning, precision fertilizing and spaying and production mapping.


Wang H.,Hunan Agricultural University | Tang C.,Hunan Agricultural University | Tang C.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Li M.,Hunan Agricultural University | And 7 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Effect of airflow speed (including natural wind) on pollens distribution for hybrid rice breeding pollination is very significant, which correlates with the yield of breeding seed closely. To study the effect of airflow speed on pollination, the basic principle of pneumatic pollination for hybrid rice breeding was analyzed. Then, tests were conducted to validate the effect of airflow speed on pollens distribution based on pollens density, horizontal distribution and vertical distribution. The results showed that pollens distribution was affected by airflow speed significantly, and pollens density, horizontal distribution and vertical distribution increased with the airflow speed increased. A distinct bimodal pattern appeared in horizontal distribution, and the second peak was far away from the pollen source with the airflow speed increased. Vertical distribution showed that pollens were close to the center of airflow with the airflow speed increased, which suggested that pollens could be spread in straight line with a certain speed and directional airflow. When the airflow speed was at 20 m/s, pollens were more in horizontal distribution, of which the vertical distribution could meet the demand of transmitting in the working area. It provides a scientific basis for further study of pollination machinery by airflow.


Wang H.,Hunan Agricultural University | Tang C.,Hunan Agricultural University | Tang C.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Li Z.,Hunan Agricultural University | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to study the effect of airflow speed, affection position and affection angle on pneumatic pollination in hybrid rice breeding, test apparatus and experiments were designed and carried out in this paper. Effect of the three factors on effective area ratio, average density and non-uniformity of pollens distribution were analyzed through orthogonal rotational quadratic combination test method, and then regression equations to describe the relationship of factors and each assessment index were established with Design-Expert8.05 data. An optimum combination of input parameters was obtained with airflow speed 21.98 m/s, affection position 16.85 cm below panicle, and affection angle 0. Effective area ratio was 88.75%, average density was 4.50 per single field, non-uniform distribution was 19.53, and the maximum desirability was 0.744. This result provides a theoretical basis for studying pneumatic pollination technology and developing pneumatic pollination equipment for hybrid rice breeding.


Mingliang W.,Hunan Agricultural University | Mingliang W.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Lun T.,Hunan Agricultural University | Lun T.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | And 3 more authors.
Advance Journal of Food Science and Technology | Year: 2014

Against the phenomenon of high impurity rate and cane and pod shell are difficult to discharge at the end of the sieve for rape combine of "Bi Lang 4LZ(Y)-1.0". This study take cleaning sieve of rape combine of "Bi Lang 4LZ(Y)-1.0" as study object, analyzed the movement of materials on sieve, established the virtual prototype model of the cleaning sieve of this rape combine, taken materials and cleaning sieve all at the best motion state as constraint conditions and optimized the structure and kinematics parameters of the cleaning sieve by utilizing ADAMS software. Optimization results shown that when angle θ between sieve surface and level is 9°, vibration angle ε is 28°, crank radius R is 12 mm, crank angular velocity ω is 32 rad/sec, the cleaning sieve has the best transmission performance and meet the requirements of the best state of motion (the cane and pod shell always maintain the upward trend and rapeseed could upward and downward). The conclusion could provide a theoretical basis for improving and optimization design for rape combine. © Maxwell Scientific Organization, 2014.


Wang Y.,Hunan Agricultural University | Hu W.,Hunan Agricultural University | Hu W.,Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment | Luo Y.,Hunan Agricultural University | And 3 more authors.
Advance Journal of Food Science and Technology | Year: 2014

In order to realize the automatic driving of the machinery working in the paddy field, using the stepping motor as the driving power and taking 2ZG630A high speed rice transplanter as the study platform, the steering mechanism of the rice transplanter was improved in this study. The controller with the fuzzy immunity PID control algorithm was designed and applied in the navigation control system of the rice transplanter as well. The test result indicated that the course deviation can be controlled within 0.5° and 1.1° and its control can be realized in 4 and 6 sec separately when the rice transplanter was driven in the cement floor or the paddy field by the speed of 0.7 m/sec. It also indicated that the steering control system of rice transplanter based on fuzzy immunity PID can satisfy the automatic navigation request of the vehicles used in the agriculture. © Maxwell Scientific Organization, 2014.

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