Optimization Design And Experiment Study On Root-cutter With Fertilization And Reseeding Compound Remediation Machine For Grassland

To satisfy the requirement of the remediation machine and technology of the degraded grassland, the paper studied the process system of root-cutting with fertilization and reseeding by using root-cutting technology with low disturbance to the soil and the new ditching technology with low power consumption, and designed the root-cutter with fertilization and reseeding compound machine which could achieve functions of root-cutting with fertilization, root-cutting with fertilization and reseeding respectively, providing a new technical mode and machine for the remediation of degraded grassland. Here are the main contents and conclutions of the research:(1) Proposed the theory of layered staggered ditching-covering which the ditch was formed by pressing down the soil to the specify depth instead of ditching traditionally, designed and optimized the ditching-covering device, formed the suitable beds for the fertilization and reseeding under the condition of the soil with high firmness in the grassland. The field experiment showed that the stability of ditching could above80%, the width of the ditching of fertilization and reseeding were29.1mm and19.5mm.(2) Through the soil-bin experiment, got the interaction power consumption per unit volume of16kinds of blades with different edge curves based on logarithmic spiral, Archimedes spiral, exponential sine curve, eccentric circular arc line, compared the results between different kinds of curves, and analyzed the effect of the parameters of each kind to the results finally got that the curve with lowest power consumption per unit volume; Modeled the relationship between motion parameters of forward speed and rotation speed and blade-soil interaction, got that the range of the ratio of the rotation speed and forward speed for root-cutting was4.0-4.1; Modeled the relationship between cutting pitch and blade-soil interaction, optimized the number of the blades on each blade pan; Modeled the relationship between cutting depth and blade-soil interaction, predicted the values of interaction torque, interaction power, so to provide basis for the parameters designing and the strength checking of the key components.(3) Designed electronically drived and controlled seeding system with multi-signal inputs by using the automatically controlling techno ledge of seeding and fertilizing, controlling the speed of the motor which drived the shaft of seeding and fertilizing according gave the driving and controlling to the forward speed of the driver, and realized the precision control to the rate of seeding of small weed seeds and fertilizing, and decreased the loss sowing and the no-uniformity sowing in the degreded grassland.(4) To realize the fuonction of depth adjustment of seeding and fertilizing and to improve the depth stability of seeding and accuracy of the height adjustment, the paper designed hydraulic synchronous height adjustment system based on PLC, and simulated the system. The results of the simulation showed that system could realize precise and stable climbing at low speed. (5) According to the process system of root-cutting with fertilization and reseeding, studied and designed the root-cutting with fertilization and reseeding compound remediation machine for grassland. The field experiment showed that the depths of the root-cutting, seeding and fertilization of the machine could respectively reach100-200mm,0-50mm,5-55mm, and the depths can be adjusted in that range, the ratio if the earth crust breaking was only14%, reducing the disturbance of the grassland and the destruction of vegetation.