| Natural rubber is an important strategic material.At present,the output of natural rubber in China cannot meet the domestic demand.Therefore,it is necessary to expand the independent production of rubber.With the expansion of the planting scale of rubber trees,the disadvantages and deficiencies of the manual rubber tapping method widely used in China are gradually highlighted.In order to solve the problems of insufficient labor force,high production cost,low production reliability and reduce the demand gap of the rubber industry,the application of automatic rubber tapping machine has become an inevitable trend.Compared with the existing multi motor control rubber mowers,the new single degree of freedom automatic rubber mower has advantages in reducing costs and improving the use reliability.This paper uses TRIZ innovative design theory as an auxiliary tool to obtain the demand and design direction of the single degree of freedom automatic rubber cutter.The structure of the whole machine is designed,and the kinematics simulation and weight reduction optimization are carried out.The specific research contents are as follows:(1)The operating environment of the rubber machine was analyzed,and the data of tapping angle,tapping depth and skin consumption were determined.The movement requirements and design parameters were summarized.The TRIZ theory is used to systematically analyze the automatic rubber cutter,and the development trend and design direction of the automatic rubber cutter are obtained.Then the composition of the system is determined.Based on the actual working requirements of the rubber cutter,the drive mode and drive mode of the rubber cutter are reasonably selected,which provides a basis for the design and simulation of the automatic rubber cutter.(2)According to the characteristics of rubber tree tapping,the whole machine of the automatic rubber tapping machine was designed.The key structures were designed and the power structure of the rubber tapping machine was selected and calculated according to the requirements of the tapping movement.The interference test was carried out on the designed structure through the three-dimensional modeling software Solid Works,and the finite element method was used to verify that the cutter head structure of the rubber tapping machine met the strength requirements.The virtual prototype simulation analysis is carried out by using ADAMS software.The correctness of the design scheme is verified by analyzing the actual movement of each component in the operation,adding the corresponding motion pair,drive,load,etc.Finally,the kinematics simulation data of the automatic rubber cutter is obtained,which verifies the rationality of the design of the automatic rubber cutter.(3)Finally,after the quality comparison and feasibility determination of the components that can be used for weight reduction design in the automatic rubber harvester,topology optimization,penalty factor method and other methods are used for weight reduction design.For the feed platform,the variable density method is used for optimization,and the optimized model is reconstructed again in combination with the rationality and manufacturability of the model,and the finite element static analysis is carried out to verify that it meets the use requirements of strength and stiffness;The method of penalty factor is used to optimize the gear transmission device and select the appropriate transmission ratio.The final weight of the rubber mower is reduced by 0.534 kg,accounting for 11.56% of the total weight of the rubber mower,which is of great significance in large-scale manufacturing and use.From the simulation analysis results,the automatic rubber cutter designed in this paper has good rubber tapping performance,reduces the labor intensity of rubber tapping,further reduces the manufacturing cost after weight reduction optimization,and makes up the demand gap of domestic rubber industry. |
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