The Research And Design Of The Basket-type Transplanting Machine’s Transplanting Device

The climate in Xinjiang is arid, so drip irrigation under mulch film is used for saving water. Based on such a premise, this paper researched on basket-type transplanting machine’s mechanism, in order to solve the problem that the film damage made by machine affects seedling survival rate. As the parallel four rod is a common transplanting mechanism, utilizing the trajectory equation of penetrating device, the film damage is quantified by the transplanting mechanism’s design parameters. The range of design parameters is determined under the condition of minimum film damage. Transplanting mechanism with novel structure is designed and kinematics simulation of that is made. The theoretical analysis of the circular motion of the planting mechanism under external force is carried out, which is verified by the simulation. The specific research work is as follows:(1)Through the summary of the existing research of basket-type transplanting machine’s transplanting mechanism, this paper mentions that the film damage degree is minimum when the machine works under the ideal conditions, and points that the ultimate aim of the existing planting mechanism research on trajectory is closer to the ideal trajectory, and the existing parallel four-bar linkage type transplanting mechanism is the simplest mechanism. This paper also presents methods and indicators about the film damage.(2)The film damage is quantified according to the research of the parallel four-bar type transplanting device’s trajectory, and the relationship between film damage and the transplanting mechanism’s design parameters is found. A design range of the gyration radius R with the minimum film damage is given. To analysis the effect of the penetrating device’s shape, this paper made a simulation with that of 53.1 degrees apex angle of inverted isosceles triangle. The result shows that the film damage is close to the minimum value as well as the speed ratio λ is close to 1, and the film damage increase more rapidly with the speed ratio λ below 1 than above 1.(3)Based on the basis of the study in the previous, the design of the three-dimensional structure of the basket-type transplanting machine’s transplanting device is completed. Then the simulation and analysis are done aiming at the kinematic characteristics of transplanting device under the condition considering the gravity and soil anti force. The results show that there is big difference between the conditions with external force and without. The main differences are that there are straight reciprocating trajectory and abrupt change of velocity under the condition with external force. The trajectory equation is extended to explain the results. According to the results of simulation, the kinematic characteristics under the synchronous planting condition are close to that under the condition without external force.(4) The theoretical analysis of the circular motion of the planting mechanism under external force is carried out, which is verified by the simulation. The research results show that the penetrating device’s perpendicularity is decided by the angle θ between the frame and the horizontal direction. While θ reaches its minimum value θ0, the angle α between the penetrating device and the horizontal direction is equal to π/2. While θ=θmax, αmax=π/2+θmax-θ0. Besides, θ is equal to θmax while the two adjacent penetrating devices are contacting with the ground at the same time. Specific value of θ can be worked out by the known value. When the angular velocity of transplanting mechanism’s rotating motion is represented by ω, the angular velocity angle of θ is a periodic function with π/2ω as its cycle, and the analytic expression of that can be known. The angular velocity angle of θ has a sudden change while θ=θmax.