| Plastic film mulching technology has the advantages of improving soil temperature,inhibiting the growth of weeds,and increasing crop yield.The use of agricultural plastic film in China is increasing year by year.Plastic film brings benefits to people,but also brings new problems.After repeatedly laying film on the land,over time,the residual film in the field has caused serious pollution to the land and the environment,affecting the agricultural development.With the gradual attention to the problem of residual film pollution,China began to study the machinery of residual film recycling from the early 1980 s.In order to save the cost and reduce the times of tractor going down to the ground,most of the residual film recovery machines after autumn are combined with straw crushing and residual film recovery.However,due to the fact that there are many debris on the film surface after hitting the pole,the film box is easy to be full,and the distance between some fields is long,the machines can not unload the residual film on the ground,which brings trouble to the later shipment of residual film.In order to ensure the working efficiency of the machines and reduce the times of film unloading,some machines and tools are equipped with large film collecting boxes.However,the larger the film collecting box brings problems to film unloading.In addition,there are many impurities,and the residual film is easy to be stuck and difficult to be unloaded.In this paper,aiming at the problem of inconvenient film unloading of the residual film recycling machine with a large collecting box,combined with the common scissor lifting equipment in life,a scissor type film unloading device is designed and installed in the collecting box of the residual film recycling machine,which is used to realize the efficient film unloading of the machine and improve the working efficiency of the machine.The film unloading of the device is to push the residual film out of the box by means of pushing.Therefore,it is necessary to know the thrust required by the residual film.According to the situation,it is necessary to calculate the thrust required by the residual film by means of theoretical calculation.The specific work includes two items: calculating the mass of the residual film in the box when it is full load by means of partial estimation of the whole;measuring the friction coefficient of the residual film by means of inclined plane friction experiment,and then connecting The thrust required by the residual film is obtained by the formula.The overall structure of the scissor-type film unloading device was designed with reference to the working principle and structure of the scissor-type hydraulic lifting equipment,and the component size parameters were determined based on the maximum thrust required for the residual film obtained in Chapter two.Analyze the advantages and disadvantages of the hydraulic cylinder installation method and determine the installation method of the cylinder suitable for film unloading.Use the virtual displacement principle to obtain the cylinder thrust.At the same time,the side door mechanism is designed to facilitate the installation of film unloading,so that the overall work efficiency of the machine is improved.The device is modeled and assembled by Solid Works software,and then imported into ADAMS software for dynamic simulation analysis.The motion state of the device and the force on the pin are obtained,which verifies the correctness of the theoretical analysis.Using the finite element analysis software ANSYS Workbench to analyze the strength of the key stressed component of the fork arm,it is concluded that its strength meets the work requirements.According to 10 times of film unloading randomly selected from the device,the average film unloading rate of the device is 99.85%,which meets the design goal.According to the actual observation,the other unreasonable parts of the device are analyzed,and the improvement scheme is made to improve the film unloading performance of the device. |
PDF Full Text Request