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The testing of sweet sorghum performance has always become a difficult problem for researchers. The physical and mechanical properties of the crop directly affect the cutting effect, power consumption and operation characteristics of the bundling harvester mechanical. This paper makes use of intelligent detection system, sampling site and loading speed influencing factors of compressive strength for the target rotation orthogonal design test, which analysed the three factors on no section and section the influence law of sweet sorghum straw compression strength. The detection system has good stability and repeatability. The experimental analysis shows that the moisture content than the sampling site is significantly affected by the compressive strength of the no section sweet sorghum stalk. The compressive strength of the section straw with the change of the sampling site and the increase of moisture content of sweet sorghum straw showed decrease the trend after the first increase. The study on the compressive mechanical properties of sweet sorghum straw can provide theoretical reference for the design of sweet sorghum harvester adjusting material device and bundling machine.

From the Angle of mechanics of sweet sorghum forage harvester feeding chopped device's working principle and design requirements for comprehensive analysis, based on the optimization analysis of each parameter, the structure and working process of the mandatory feeding mechanism of the forage harvester were optimized. Parametric 3.0 software is used to design a 3d model of the cutting blade of the green fodder harvester. The maximum displacement of the dynamic blade was 0.123mm and the maximum stress was 93.6mpa. The research provides a reference for the overall research and development of forage sweet sorghum combine harvester.

Solid ice-snow is the collection of impurities and ice-snow particles with adhesion and cohesive force after covering the ground, such as the external load and environmental factors. The destruction of ice-snow and the mechanism of removal determine the difficulty degree of ice-snow removal. Firstly, the constitutive model of ice-snow was established. It is considered that the ice-snow are micro-neck links, and its characteristics mainly depend on the binding properties between ice-snow particles. Secondly, the failure process of solid ice-snow is analyzed by high-speed camera. It is found that the failure mode of solid ice-snow is mainly brittle fracture, and the failure process involves three stages: cutting peeling and contacting. Finally, the failure criterion is established based on the solid ice-snow constitutive model, the form of ice-snow failure and the failure process. Besides considering the tool parameters, the friction factor, snow density and compressive strength, Young modulus, friction angle and the other factors are taken into account due to the temperature change. The establishment of the failure criteria provides a practical reference and theoretical basis for the removal of solid ice-snow.

Plough shovel farming conditions are poor, easy to wear. In order to solve the problem, the new process of surfacing was proposed and Fe-Cr-Mo-Mn alloy was welding on the easily worn parts of the 65Mn steel subsoiler. The surfacing layer and substrate binding status, microstructure and wear resistance were tested and observed by using optical microscope, micro hardness, and abrasive wear test machine. The combination of the microstructure of cladding layer is mainly composed of lower bainite and retained austenite, while the welding layer and substrate are in good metallurgical bonding. The wear resistance increased by 2.38 times, and the tillage life of the plough is prolonged.

Wear is the main reason for the failure of agricultural machinery, which has become an important constraint factor for the development of high speed and large scale tillage machinery in China. The annual economic loss is more than 15 billion yuan. A plow shovel field soil touching parts as the key parts of tillage machinery, improving the wear resistance and reliability can save farming time and economic benefit. The field of deep plowing plow test was carried out in Beixing farms from Qitaihe city, Heilongjiang province. The optimal design method of three factor and five level orthogonal regression rotation center group was adopted in the experiment. The operation speed, tillage depth and penetration angle as the influence factors, to wear surfacing plow shovel as objective function, data processing and analysis using Design-Exper8.0.5 software to determine the optimal parameters of welding operation of deep plowing plow shovel. The field test shows that the wear resistance of the wear resistant plough is good, and the service life is 2.58 times higher than that of the market. Through the field contrast test found that plasma surfacing abrasion and plough shovel's performance is good, the service life of the average is 2.58 times higher than ordinary plough shovel market.

In the north of China, the road is covered with the solid ice-snow which seriously affects the traffic safety of the city, it is a problem that how to clear the solid ice-snow quickly and efficiently. The concave disc clearing machine and the vertical milling clearing machine have been developed respectively based on the thought of agricultural machinery concave disc and vertical milling principle. The concave disc clearing machine is the clearing plate passively cutting ice-snow, which can complete crushing, cutting, scraping, tilt and push five operations. The vertical milling clearing machine is the cutting knife actively cutting ice-snow with function of milling, crushing, copying, obstacle etc, which has a very strong crushing capacity for ice film like high density ice-snow. The comprehensive clearing snow performance test of the concave disc and vertical milling clearing machine were performed under three kinds of road conditions. The test results show that the concave disc machine and the vertical milling machine have good operation, high working efficiency and the clearing rate are all higher than 90%, parameters setting and all indexes can meet the requirements of snow clearing operations. The concave disc machine is suitable for the plate compacted ice-snow which density is lower than 550 kg/m3 and thickness range from10 mm to 80 mm. The vertical milling machine is suitable for the plate and ice film ice-snow which density range from 300 to 750kg/m3 and thickness is lower than 50mm, especially suitable for ice film freezing ice -snow, which density is higher than 550kg/m3.

In order to reduce the towing resistance of the digging maize stubble device and ensure the indicators of reducing missing ratio and raising the harvest productivity when reaping maize, the new harvest technique was put forward, namely, stubble cutting shovel first stretch stubble ridge, and then maize rhizomes were collected by rhizome pick-up device and auxiliary pick-up device together. A pick-up tooth with U-structure and arc structure was designed. At first the motion coordination between rhizome pick-up device and assistant pick-up device and the motion interference among other parts of maize harvest machine were analyzed and checked by the help of motion simulation mould of Pro/ENGINEER software, and then the whole placement of all parts and their designs were improved, at last the maize harvest machine possessing compact structure and high efficiency was designed. The field experiments prove that the designed maize harvest machine can meet the design performance index and possesses the good work dependability, which is of great significance for subsequent research.