ROPS is an effective way to reduce casualty rate in the rolling accident. This paper introduces the design of a cab to strengthen safety-ROPS large wheel loader method. The finite element model, it's a ROPS rear, absorbers and supporting structure frame of the safety-cabs, was created. Force and displacement boundary conditions obtained in accordance with the international standard ISO3471:2008-The large deformation elastic-plastic finite element analysis, horizontal, vertical and ROPS vertical load cases of performance testing and the corresponding lab for investigation. The test results show that the design can meet the requirements of ISO3471 ROPS: 2008. Test results differences and simulation and welded joint of the fracture analysis on the reason.
Forestry Felling &Cultivation Machine is a multi-functional, highly automatic and greatly efficient wood-cutting facility, whose unique advantage can be shown in the field of wood-cutting in the mountainous region. Mechanical arm is a prominent component of Forestry Felling &Cultivation Machine so that its design will have a direct impact on the function and the efficiency of Forestry Felling &Cultivation Machine. The paper aims at realization of hypothesized design of Forestry Felling &Cultivation Machine under the control of computer platform through hypothesized design of computer and simulation technology. Besides, it focuses on the structural analysis of mechanical arms through finite element theory and software of finite element analysis. What’s more, optimized design of structure will be reached according to the result of analysis so that the reliability of the structure can be proved and both development cycle of product and its research and development expense will be reduced.
After analyzing and studying the existing sowing operation in forestry, a set of technological process of precision seeding based on optimal-control theory has been put forward and the prototype has also been designed and produced. This paper presents the general structure of the apparatus and analyses the working principle. An adjustable cell wheel feeding apparatus is designed to solve the problem of the uniformity of seeding. The theories of cooling mulching without adhesive on nutrition membrane and the process of membrane mulching are analyzed to set up the pressure model of the roll. After the experiments on the pressure of the roll and the analysis of the data, by the calculation of axial pressure transfer coefficient of the roll, has determined the best pressure of membrane mulching. At last, the test conditions of the prototype show that the frequency of failures is decreased, the damage rate of seeds is reduced, the seeding precision is improved, which satisfy the requirements of technical regulation on seeding in forestry and is beneficial to improve utilization ratio of good seeds.
Extremity exoskeleton of power assist robot can help people support the load and enhance the durability of bearing the load. This paper mainly introduces the mechanical structure about extremity exoskeleton of power assist robot that is used in the forest. The environment of the forest is complex, and the forestry production is always done by human beings. The work is very heavy, so we want to develop a kind of device to help them. If this device can be promoted to forestry production, it will greatly improve the production efficiency. This device represents the most cutting-edge technology in the field, doesn’t delay the reaction of body movement by the sensors on its body, and is more powerful.
By comparison of the drive systems in electric vehicle and fuel vehicle, this study indicates the main differences of the structures between these two items, and explores the electric retrofit designs of forestry tending vehicles theoretically and practically, upon focusing the developing trend of cleaning environment and based on Tractor 50. On this foundation, the paper finally puts forward to suggestions on retrofit design.
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