Structure Designing And Dynamic Optimizing Research On Binding Parts Of A Rice Reaping-binder

The planting area and total production of rice takes about a proportion of 34% and 44% respectively of all crops in China, which means rice is the most dominant foodstuff in terms of planting area and production. Because of climate, planting scale, geometry conditions, there are a lot of regions in China where big-scaled combine harvesters can't work. If mid-small-scaled rice reaping-binders can be used for indirect harvesting in steps, we could save time for lack of harvest machines. Also, the harvest quality, machine productivity and total rice production can be raised. Harvest reaping-binders are used for reaping and binding crops, for example of rice, and it is to some degree complicated comparing with other mid-small-scaled harvest equipment. It consists of walking parts, power transporting parts, pre-processing parts, reaping parts, crop transporting parts, and binding parts, the property of which is most important to the whole working quality. Enlightened by bionics of the flexible binding process of human fingers, this research focuses on the binding parts study by using virtual prototyping technologies.Firstly the main parts of a rice reaping-binder were designed, including the reapers, the grain lifters, the grain dividers, and the binding parts, which was emphasized for studying. Then all parts were assembled together for drawing. In this process, the property of parts was deeply understood. An orthogonal-supplemental experiment of binding productivity was taken, under the condition of various working transmission of the reaping-binder, various crop qualities, and various binding ropes, in the inside soil bin lab, for measuring the force data on the binding parts. We found that the factors which affect the experiment, in the sequence of importance, are crop qualities, type of binding ropes, and the working transmission of a reaping-binder. An optimized combine of the factors are crop moisture content of 30.1%, transmission of manual operating, original ropes. The factors affect very little the force on binding parts. The fact that binding parts affect a lot the binding parts has been validated. Also, the force data on the binding parts has been acquired, which is an important reference reason for the next step of establishing models.Virtual prototyping technology, which is also called mechanical system dynamic simulation technology, was developed in 1980s. Not only Applying virtual prototyping technologies in developing new production can decrease production costs by saving capital and time, but also increase production's competence in market. Thereby, studying the application of virtual prototyping technologies in agricultural machinery design, actualizing numeral development of agricultural machinery, can raise the agricultural machinery research level, also can promote the development of agricultural mechanization. By using Pro/E software, 3-D models of binding needle parts and binding nib were established and they were assembled virtually in the Pro/E environment. Afterwards, the binding parts were placed in the 3-D environment under the space limit and all the models were converted into ADAMS from Pro/E by using the interface software Mechanism/Pro. The 3-D models were restricted virtually so that they could be analyzed in motion.The author predigested the binding needle parts into a crank-rod mechanism and its kinemics was analyzed. The design relation of the crank-rod mechanism was confirmed and its motion was simulated in ADAMS environment, so the dynamic and kinetic characteristic was gained. The binding needle parts were analyzed and they were parameterized in the ADAMS environment. Design Variables of locations of the mechanism joints were established and a first optimization of the mechanism under the optimum aim of smallest driving moment was undertaken. Afterwards the sensitivity Design Variables (DV) of this mechanism could be found. Then a second modification of the sensitive DVs was conducted and the crank-rod mechanism was optimized. The most sensitive DVs were confirmed and the optimum combine of DVs was assured. As a result, an optimized location of joints leaded to an optimized mechanism.This work established the 3-D geometric models of the binding parts of a reaping-binder, the dynamics & kinetics characteristics of which has been analyzed by utilizing the Virtual Prototyping Technologies. An optimized location of the binding needle parts under the aim of smallest driving moment on the crank of the parts has been found. The modern digital detection and design method of virtual assembling, motion simulating, and optimizing in the dynamic characteristics research on the mid-small-scaled rice reaping-binder are applications of computer technologies in agricultural & mechanical design, which lays the foundation for ulterior research in the binding parts of reaping-binders and similar mechanisms of other agricultural machines. This paper work has novel reference to the agricultural & mechanical design.