| Subsoil shovel is the main working part of subsoil operation tool,its performance directly determines the subsoil quality and energy consumption of the tool.The traditional deep shovel design and research methods are mainly theoretical calculation and software simulation,there are problems such as the ideal setting of the simulation conditions,which leads to the analysis results deviating from reality and other problems.In addition,farmers cannot realize real-time monitoring of the state of deep shovel during field operations.There is a phenomenon that the over-deformation of the deep shovel is not timely and leads to soil missed tillage and shallow tillage,which seriously affects work efficiency.Therefore,this article starts from the working principle and working environment of the deep shovel,combines the single-chip technology and virtual instrument technology,and designs a set of real-time working resistance of the deep shovel based on the principles of miniaturization,low power consumption,low cost and easy installation.Test the system.The system can not only provide testing means and data support for R&D personnel to design and optimize deep shovel,but also provide real-time monitoring tools for farmers to reduce machine damage.The main work contents and conclusions of this article are as follows:(1)The stress and simulation analysis of the deep shovel was carried out.According to the structure and working process of the deep shovel,the working resistance and strain test principle of the deep shovel is analyzed,and the feasibility of measuring the working resistance by directly attaching strain gauges to the handle of the deep shovel is verified.Through simulation,the location of the test point is determined.(2)Completed system construction and software and hardware design.Based on the principle of strain testing,the system architecture was determined,the selection of strain gauges,microprocessors,and core chips of various functional circuits was completed,the hardware circuit was built and simulated,and the system hardware anti-interference design and equipment installation protection design were completed.The software design and development of the vehicle-mounted data acquisition system has realized the functions of data acquisition,storage and early warning of working resistance of the field work of the deep shovel.It has completed the software development of the stress-strain calibration system of the deep shovel and realized the collection of loading force and strain signals.Calibration,data management and other functions.(3)Carry out systematic tests and field trials.Taking the standard equal strength cantilever beam as the test object,the static test of the strain collection system was carried out.The test results showed that the relative error between the measured value of the system and the theoretical strain value of the cantilever beam was less than 2.09%,the system linearity was 0.072%,and the repeatability error was 0.11%,hysteresis error is 0.089%,has good static test performance;using the DH5928 signal acquisition system as a reference,a deep shovel dynamic test comparison test was carried out in the soil trough.The test results show that the maximum relative measurement results of the two systems The error is 0.74%.The T test analysis results show that there is no significant difference between the measurement results of the two systems,and the system has good dynamic performance;a field test of the deep pine layered fertilizer applicator was carried out to compare the working resistance of the deep shovel with the soil firmness.Analysis,the results show that the system field test performance is reliable. |
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