Studies On Tree's Pruning Machine With Spiral Movements

Pruning is one of the most important and necessary step of cultivating plantation forest.The traditional pruning machine has low working efficiency,high casualty,limited prunning height and is difficult to meet the need of fostering the large area of commercial plantation in China.So the key method is to develop an automatic pruning technology,which should be safe,high quality and efficient.Based on analying and studying of the request of tree to the pruning processes,this paper carried on a research at following several problom;1.By the inquisition,analysis and statistics of familiar trees,study the shape of tree branch,make sure the best parameter of the pruning machine,such as the diameter,angle...etc,of the tree branch that it can cut.The research shows;diameter of trunk that tree's pruning machine can cut is 8-22cm,the diameter of the tree branch is between the 0-6 cm,the angle of the tree branch and tree trunk should be in more than 30 degrees.2.Analyze the work method of the pruning machine,study best work method and cutting mechanism of pruning machine.Study shows;the pruning machine with remote controling, semiautomatic and rose,fall and cut with helical is a better work method.The chain type's sawing mechanism is most reasonable cutting mechanism.Avoid reasonless cut mechanism shoud be designed, evade reasonless cutting status.3.It studies design of pruning machine's backstop; make use of 3D surface and curve design method and thought to research design thought of the kind of parts.Make use of projection of curve (such as two projections of the curve)to establish space curve,and then make the digital model of space subject space is better 3D design method of the kind of parts.4.It studies the bark of the tree and the interaction of the tire of pruning machine,measures roll friction coefficient of tire and the tree roll over and calculates requisite power when pruning machine rose on tree,provides important basis for the choice of power.The sensor technique is adopted in experimentation,the forces of test system is measured,then calculate roll friction coefficient and requisite power at specifically speed.5.It studes motion of pruing machine when it rise,descend and saw,then design reasonable mechanism of transmission and operation.Experiment and reserach shows spring with rectangle's section is a kind of better parts in the transmission of small machine; it can be extensively used for delivering to torque and motion.The purpose of change transmission velocity can be achieved by reasonable design and combine.6.It studies relation between the status of the branchof tree and structure of avoid mechanism and motion,bring forward best structure and parameters in avoid mechanism.In a word,the textual research is some design methods of the quest in the pruning machine design. The result and method of this research provid a new method and thought for design and research of pruning machine.