| Mechanization of greenhouse automation level has become one of the important indicators when every country to show the world of agricultural science and technology development. Automation seedbed changement of transportation is an integral part of advance the degree of greenhouse automation and efficiency. Collect related information about the present development of seedbed transportation systems of Holland, Israel, Britain, Belgium and other countries, and comparison with the development situation of seedbed transport systems, find out the problem that the development of the existing seedbed conveying systems in China. We put forward a seedbed changement suitable for greenhouse seedbed conveying systems in our country. We named it as seedbed transportation double push rod changement.This research mainly around the proposed seedbed transportation double push rod reversing mechanism to carry on the design and research, and based on seedbed transport system of horizontal transport track, vertical transportation track, lifting mechanism, etc. The research content specific as follows:(1)To save space and improve the efficiency as the starting point, in order to fill the defects of existing seedbed transport agencies, we innovative proposed the design thought that seedbed transportation double push rod changement. And the agency can match seedbed lifting mechanism and existing lateral transportation mechanism, longitudinal transportation mechanism compose the seedbed transport system.(2)We provide the overall scheme design. Then we are the design of the 3D model and the motion simulation; Set up the experimental platform; Paint a work flow chart, and then write the preparation of the seedbed transportation system control program; Draw circuit diagram, and connect the PLC and the external circuit; Import program into the PLC, debugging experiment platform, until the transportation system can be run.(3)A study on test for seedbed migration problems in the process of seedbed transportation. Offset as experimental indexes, the drive of the motor drive frequency, seedbed load, seedbed running distance as independent variables, using regression orthogonal experiment, designing experiment scheme. The regression equation about offset is obtained by the experiment. According to the equation to predict when the seedbed with potted flower, motor driven frequency of 4 k Hz, seedbed more far distances, the greater the offset, maximum offset can be up to 10 mm. Based on it to determine the size of the push-pull plate minimum not less than 20 mm.(4)Design the experiment about the operation performance of changement, test for the success rate of the changement operation. The test were performed under different experimental conditions, through a large number of experiments, the operation success rate of seedbed changement is more than 99%. We found, during the transportation, the maximum offset is 6mm, the smallest offset is-2mm in the experimental process, examine the rationality of the push-pull plate set the minimum value is 20 mm.(5)Calculate the work efficiency of seedbed transportation system, it is concluded that, the working efficiency of the existing transportation is 85 per hour; The working efficiency of the seedbed transportation in this topic designs is 105 per hour, the efficiency can increase 23.5%. |
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