Development of the transfer platform with ground wheel in front for the medium-sized no-tillage stalk mulching ridge corn planter

Abstract: With the improvement of agricultural equipment level in China, agricultural machinery is developing towards large, wide and efficient trend. Large and medium-sized no-tillage sowing equipment can not only reduce production cost, but also meet the agronomic requirements of no-tillage operation in northern China, and can increase crop yield. However, its wide width and heavy weight lead to the problems of difficult transportation and operation transfer. This study is aimed at the practical application of the medium-sized no-tillage mulch and ridge planting corn seeder as the research object. The medium-sized seeder is connected with seven groups of seeding units with row spacing of 650 mm. On the basis of theoretical analysis, the use of digital prototype, virtual simulation technology to determine the right drill transport platform, through the wheel mechanism and traction mechanism to lateral suspension operation, longitudinal traction transportation, land wheel deformation parameters, arrangement of hydraulic, traction mechanism and transmission ratio adjustment, etc. The transmission system can transfer power to fertilizer shaft and seed shaft according to the specified transmission ratio. The hydraulic electric control system is composed of pressure relay and electromagnetic directional valve to reduce the number of oil inlet and outlet and simplify the operation steps. The simulation results show that the synchronization accuracy of the hydraulic cylinder of the ground wheel mechanism is less than 3.6%. The hydraulic electronic control system is easy to operate and can accurately reach the sequence action position, and the synchronization performance is good. The finite element analysis module of CATIA software was used to analyze the stress and strain of the frame and the ground wheel mechanism. The strength of the frame under the braking state during transportation met the requirements. The stress analysis of the ground wheel mechanism showed that it had good strength and stiffness, and there was a large space for optimization. The total mass of the high mobility frame platform is reduced from 244.0 kg to 178.8 kg, and the mass reduction ratio of the auxiliary ground-wheel mechanism is 26.72%, and the mass reduction ratio of the dual ground-wheel mechanism is 10.96%, which can meet the strength and stiffness requirements of the ground-wheel mechanism, and the optimization effect is significant, and can meet the requirements of transportation and operation. The hydraulic electronic control system test and road transportation vibration test show that the whole machine meets the requirements of various indicators, meet the requirements of mid-sized no-tillage mulch and furrow seeder operation transfer, hydraulic electronic control system can control the hydraulic cylinder to complete the sequence of action, the operation state conversion time of 5min, saving the operation transfer time. Through analyzing the vertical acceleration of the road transportation test vibration, the natural frequency of the vertical vibration at the center of mass of the frame increases with the increase of the vehicle speed, and the increase amplitude decreases gradually. When the driving speed is 10, 15 and 20 km/h, the natural frequency of vertical vibration acceleration at the center of mass is concentrated within 0-3 Hz, and the natural frequency of vertical vibration increases with the increase of driving speed, and the vibration intensity increases rapidly. When the driving speed is 25 km/h, the maximum vertical displacement of the vehicle's center of mass is the largest, which meets the requirement of radial pendulum momentum, and the transportation is safe and stable. In this study, the high maneuvering platform technology was applied reasonably to the compact medium no-tillage mulch and ridge corn seeder, which solved the difficult problem of operation transfer and provided reference for the design of transfer platform of wide range agricultural machinery equipment.