Based on STC89C52RC Single Chip microcontroller, the control system of seedling vegetable harvester was designed with the help of modular design method. According to the mode of operation for seedling vegetable harvester, the infrared remote device and photoelectric sensors were selected, and then the hardware of the control system including running system, cutting device and conveyor device was set up. Through the performance test of the prototype, the harvester can go forward, backward, accelerate, decelerate, turn left, and turn right; the photoelectric sensor can control cutting device and transport device to start and stop automatically and easily, which shows the control system has good performance.
In order to meet requirement of separation screen for tenebrio molitor L, one separation screen was designed, this product has a good separation, simple structure, low cost, high efficiency, easy operation. Based on the analysis of design requirement of separating screen for tenebrio molitor L, overall structure, working principle and the main structural parameters were determined. The kinematic mathematical model of shaking mechanism was established by using the vector method. The kinematics analysis of shaking mechanism was conducted by using Matlab, the displacement, velocity and acceleration curves of sieve box were obtained. The performance test showed that the prototype machine can screen different instar tenebrio molitor L and frass, this machine has good screening effect. In addition, machine design and performance are able to meet the design requirements.
[Purpos] in order to solve design problems of the cutter for the seedling vegetable harvester, a reciprocating cutter with a crank linkage mechanism has been designed. [Metho SolidWorks software has been adopted for virtual design of parts and assemblies of the reciprocating cutter for the seedling vegetable harvester. A mathematical model for kinematic analysis of the cutter taking a crank linkage mechanism as its transmission system has been built. Matlab is used for kinematic analysis on the double-crank linkage mechanism from aspects of displacement, velocity and acceleration of followers. [Result The cutter has been applied to the seedling vegetable harvester for the experimental purpose and turned out to operate reliably and produce uniform height and leveling shearing fracture. [Conclusion Results indicate that the cutter has been reasonably designed, which will provide theoretical and practical basis for related design.
Three-dimensional 3D modeling, surgery simulation and face prediction of the maxillofacial soft and hard tissue has a great significance for the study of facial growth and development, diagnosis and treatment of facial deformity and postoperative face prediction and treatment evaluation. Based on maxillofacial 3D modeling and measurement analysis, real-time variable model is set up. In virtual environment, image feedback, force and tactile perception in combined together surgical simulation. Furthermore, the system of surgical prediction and postoperative results display is proposed, which has great value and clinical significance.
[Purpose] To solve problems in design of the cutter for seedling vegetable harvesters, a cutter with a double-eccentric circle cam mechanism has been built. [Method] A mathematical model for kinematic analysis of cutters driven by a double-eccentric circle cam mechanism has been established. Under the model, Matlab has been employed to make kinematic analysis on displacement, speed and acceleration. Also, SolidWorks software has been adopted for virtual design of parts and assemblies of the cutter. [Results] The cutter has been applied to the seedling vegetable harvester for the experimental purpose and turned out to operate reliably and produce uniform height and leveling shearing fracture. [Results] This design will provide theoretical basis and practical reference for relevant researches.
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