Research And Development Of Anti-rollover System For Corn Harvester

The working environment of the corn harvester is complicated,especially in the mountai ns and hills of the northwest,and the load resistance of the front axle and the rear axle is large,and the eccentricity of the center of mass is large,and it is prone to rollover in the uphill and slope.Therefore,it is very important to study the efficiency of harvester and improve the adapt ability and comfort of harvesters and improve the efficiency of harvester harvesting.In view of the needs of the harvester in anti-rollover,the following aspects are mainly studied:(1)Design of chassis structure for harvester based on hydro-pneumatic suspensionFirst of all,according to the weight of the frame of the harvester is heavy and the bearing is different,and the transverse beam and the longitudinal beam of the whole harvester are made of a higher strength I-beam,the front and rear side beams exert a force in contact with the structure on the frame,then observe the deformation of the chassis and whether the force is in the allowable range,and the larger parts of the force to increase the ribs.Secondly,according to the entire harvester load all concentrated to a cylinder,and the maximum pressure of the cylinder is 16 MPa,calculate the maximum cylinder bore of hydro-pneumatic suspension.At the same time,determine arrangement of thrust rod structure of hydro-pneumatic suspension system the entire harvester,and analyze the thrust rod,and determine the thrust rod model.As the body is leveling,the relative position between the frame and the axle constantly changing,resulting in the use of the engine belt to the axle transmission power can not be achieved,and the use of hydrostatic drive,while the engine and the bridge change into a hydrostatic drive Dedicated engine and axle.Finally,the structure and layout of the suspension parts and the whole machine are determined.(2)Simulation of the leveling motion of the chassis based on hydro-pneumatic suspension.In CAD,the frame deflection is simulated when the cylinder moves to the maximum limit position.Finally determine the hydraulic cylinder and thrust lever offset angle in the extreme position.Observe whether the hydraulic cylinder and thrust rods are subjected to the maximum universal angle range.To prevent the movement of hydraulic cylinders and thrust rods interfere with each other,and pull off the thrust rod or damage the connection seat.(3)Design of anti rollover hydraulic system based on oil and gas suspension chassisThe oil and gas suspension system can effectively enhance the performance of the harvester,however,due to the front and rear of the harvester bear a greater weight,oil and gas suspension hydraulic system with constant flow rate,cut off accumulator and pressure tracking connection is designed on the basis of the hydraulic system of the connected oil gas suspension in this paper.It can effectively solve the problem that the two oil cylinders are not synchronous and can not be adjusted because of the difference of bearing load.The entire hydraulic system can be synchronized in the hydraulic system to ensure the lifting,but because of the complexity of the entire oil control and no ready-made pressure tracking valve,no mature experience can be used for reference.Considering the control requirements and costs of harvesters,The hydraulic system adopts independent control hydraulic system,rather than the connected hydraulic control system.(4)Research on leveling control strategy of oil gas suspensionBased on the research of the position error control algorithm and the angle error control algorithm,according to the specific characteristics of the harvester,the leveling control strategy of angle error control algorithm is proposed in this paper.Making leveling at both direction of X and Y,first adjust the direction of large angle.By reducing the hydraulic cylinder to reduce the center of the harvester and keep harvester stable.When lowing one side of the harvester unable to achieve leveling,then raising the other side.Finally,writing some programs of the whole leveling process.(5)ADAMS simulationBased on ADAMS,the virtual prototype of the harvester and the anti rollover experiment platform are established to simulate the situation of slope,uphill and downhill of harvester.Simulating the traditional harvester and the installation of oil and gas suspension harvester rollover to verify the anti rollover performance of oil and gas suspension.