为解决残膜回收中卸膜不可靠、卸膜率低的问题,基于MB(Majumdar-Bhushan)接触分形理论,分析杆齿式残膜回收机卸膜工作过程中拾膜杆齿和卸膜刮板间的接触载荷与形变量的关系及其动力学影响因素.运用ANSYS软件对拾膜杆齿和卸膜刮板的接触过程进行仿真分析,并通过高速摄像试验追踪了拾膜杆齿末端的运动轨迹,测量卸膜过程中拾膜杆齿与卸膜刮板前端的最大形变量.结果表明,当拾膜机构转速为36 r/min时,拾膜杆齿和卸膜刮板前端的最大形变量分别为15.741、49.733 mm;当机具行进速度为0.85 m/s且机具行进速度与拾膜杆齿轴线速度比为1.5时,机具有较高生产效率,能保证可靠卸膜.该研究结果可为拾膜、卸膜机构的运动参数优化提供参考.%In order to solve the problem of "white pollution" caused by the residual plastic film, researchers has carried out a lot of researches on residual film recovery technology and produce a variety of residual film recycling equipments. Lots of residual plastic film collectors have been designed to address "how to pick up" in recent years, however, the problem of "how to unload" is often overlooked. This study was to investigate the uploading process of a pole-tooth residual plastic film collector that was designed to efficiently collect and unload residual plastic film. Based on the MB (Majumdar-Bhushan) contact fractal theory, the relationship between the contact load and the deformation during the contact between the unloading blade and the rod was obtained, and the relationship between the material and the motion characteristics of the dynamic contact load was also obtained by the dynamic contact analysis. The contacting payload and contacting deformation and dynamic influencing factors between picking-up pole-tooth and unloading film scraper in the process of film uploading were analyzed and simulated using a finite-element analysis software, ANSYS. A high-speed camera was used to track the trajectory of the picking-up pole-tooth, and the maximum deformation of picking-up pole-tooth and unloading film scraper front end was observed during the process of film unloading. The resulted showed that, to satisfy reliable unloading films, the maximum deformation of picking-up pole-tooth and unloading film scraper front end were 15.741 and 49.733 mm, respectively when the rotation speed of the picking-up film mechanism was 36 r/min. The pole-tooth plastic film residue collector could reach the higher production efficiency and ensure unloading film reliably when the speed of the machine was 0.85 m/s, and the speed ratio of machine to pole-tooth was 1.5, the pole-tooth residual film recovery machine could ensure reliable unloading of film in the case of high production efficiency. When the speed of the machine was 0.60 m/s, and the speed ratio of machine to pole-tooth was 1.0, because the speed of picking-up film mechanism was low, the film picked up by pole-tooth could be slipped off in the process of moving up. When the speed of the machine was 1.20 m/s, and the speed ratio of machine to pole-tooth was 1.5, the rotation speed of the picking-up film mechanism and unloading film mechanism were improved, and the working efficiency of the machine was improved. However, the contacting time of the film and the picking-up rod got shorter, which was harmful to the unloading and collection of the residual film. Through the finite element simulation and high-speed camera test of the unloading process, the contact deformation of the rod-splicing tooth and the unloading mechanism was observed, and the conditions of reliable unloading of the rod-type residual film recovery machine were analyzed, and the optimization of the equipment was provided, the experimental result was consistent with the simulation result. The results can provide the support for motion parameter optimization of picking-up and uploading residual film mechanisms in design of a pole-tooth residual film collector.
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