Design And Experimental Analysis Of Bionic Furrowing Opener

Furrowing opener is one of important components in seeding and fertilizing. They often work in the soil with high moisture content. Soil adhesion on the surface of furrow opener increase the drag resistance considerably, makes the opened furrow irregular and depth of furrow not uniform, influences the performance of seed and, sometimes, makes them stop working. All these phenomena will influence the seeding quality. In order to enhance the working performance of farming parts and solve a series of problems which are caused by soil adhesion in operating, the author studied the engineering bionics theory on reduce soil adhesion and draft resistance, and analyzed the mechanism of anti-adhesion of some soil-burrowing animals against soil and bionic ripple nonsmooth surface for reducing soil adhesion and draft resistance, designed the ripple nonsmooth morphology surfaces based on the mechanism of soil –burrowing animals and applied the bionic morphology to the surface of furrow opener. This work enhanced the development of the mechanism of reducing adhesion and resistance using the bionic nonsmooth surface morphology and expanded the application of the bionic nonsmooth methods application in terrain machine. The conducted main work includes: the measurement of the existing furrowing opener by measuring engineering, the designs of the bionic nonsmooth furrowing opener, the computer simulation of the interaction of furrowing openers with soil and the experimental examination of the furrowing openers in indoor soil bin.Computer simulation method cannot only provide physical parameters that cannot be measured in experiments, but also modify the parameters of structure and movement conveniently. The method can shorten the development period of new products and reduce the developing cost. Computer simulation involves three parts: modeling, solution and analysis. In this work based on existing furrow opener, point data of furrow opener's surface were obtained with reverse engineering technique and 3D reconstruction was conducted with a software in order to attain computational model of furrowing opener surfaces. According to the movement rule of soil on the surface of furrow opener, a bionic nonsmooth morphology was designed on the soil-engaging surface of the opener in order to receive the ripple nonsmooth surface model. The model of the interaction of the opener surface with soil was established with CAD software and, then, transmits it to ANSYS software via IGES format. Element type, material and same parameters were defined. The model was meshed, limited conditions were added and resolution parameters were setup. Afterwards, the procedure of the interaction of the opener with soil was simulated. The simulation result was analyzed through powerful postprocess functions. 3D disturbing nephogram, 3D stress nephogram and Z direction stress curve through the path node for the cultivated soil were obtained. The simulating results showed that the stress caused by nonsmooth surface was fluctuant and the stress caused by smooth surface was steady. This phenomenon indicated that the nonsmooth surface can decrease the continuity of soil sliding on the nonsmooth surface, which resulted in preventing the surface from soil adhesion and reducing resistance.The bionic ripple nonsmooth morphology was designed and optimized and the structure parameters of the bionic ripple nonsmooth morphology were obtained. It was shown that ultra high molecular weight polyethylene (UHMWPE) possesses better anti-adhesion and anti-resistance properties. So, this material was used for the ripple units for the bionic nonsmooth surfaces. The ripple units were prepared with hot pressing technique. The bionic nonsmooth surfaces were formed through gluing the ripple units on the surfaces of the conventional furrowing opener. The tests were run in an indoor soil bin. The experimental scheme was designed by orthogonal experiment method. The experimental index chose was the forward resistance of the opener against soil. The experiments were conducted a...