Research And Design Of A High-Efficient Double-Sided Trimmer For Hedge

Along with the sustained growth of Chinese highway development, hedge sectors implementation becomes a major focus in the development of highway construction. One of the problems we face here is the burden for hedge trimming. Aimed to tackle this issue, this dissertation proposes a novel hedge trimming manipulator with high performance and less worker labors after analyzed real situation of highway hedge trimming sector inland and abroad.In order to improve the trimming efficiency, shorten the time being blocked while which section is trimming, the scheme of a trimmer with double clip functions was determined, Components for the vertical and horizontal pruning mechanism were designed, so both side of a hedge could be trimmed at the same time, and a vehicle to burden this mechanism was choose. During the design process, the regular type of the turning device is infeasible at this specific condition. Hence, a novel revolving platform for this manipulator was put forward, which is able to yield any rotation angle accurately. It is implemented by a hydraulic cylinder.First, the trimming manipulator model is developed in Pro/E package. Then its optimal design for the mechanical structure is obtained through finite element static analysis in ANSYS. Second, the optimized structure is proved to have enough stiffness and intensity through second verification. In addition, its modal analysis demonstrates that vibration frequency triggered by the ground and working part is kept out of the reach of the manipulator natural frequency, which successfully avoids the resonance. Also, the manipulator trajectory won’t have any interference with other working components by kinematic and dynamic simulation proceeded in ADAMS. As to the implementation part, there is potential improvement in the structure based on the stress curve yielded by hydraulic cylinder. While in working conditions, the center-of-gravity shift of the manipulator will compromise the controllability of the car burden the pruning mechanism. To resolve this problem, a movable balancing unit is added to improve the controllability. Simulation of stress on both front and rear tires verifies this balancing unit with high performance.Though details of design work and the relevant verification this high-efficient hedge trimming manipulator is proved to be feasible and expected to be applied in real plant.