关键词: 精整地机, 镇压器, 液压系统, 高度调节, 平整度

Abstract: In order to effectively improve the problems of soil fineness and low levelness, the design and optimization of the press and the press height adjustment device of the vegetable finishing machine were carried out. Two sets of ballast height adjustment devices were designed. One kind of ballast height adjustment device was composed of doubleacting hydraulic cylinder, control valve, hydraulic pipeline, hydraulic operating mechanism, monitoring wheel, pressure sensor and other components, which could realize automatic adjustment of depth feedback; another kind of height adjustment device was to change the distance between the roller and the soil by turning the handle. The maximum adjustable distance was 10 cm. The structure was simple and compact, and it was convenient for maintenance. This paper expounds the working principle of the pressing parts of the vegetable land preparation machine, redesigns the pressing roller shaft and other parts, and carries out field test and research. The results of the field test showed that under the same condition of soil moisture content of 20.5%, when the traction speed was 1.2 m/s and the rotation speed of the soil breaking roller was 439 r/min, the effect of the traction speed and the rotation speed of the soil breaking roller on the soil smoothness was the best. When the traction speed was 1.1 m/s, the speed of the power output shaft was 720 r/min, and the soil moisture content was the same, the soil evenness of the twoaxle machine was significantly better than that of the singleaxle machine. The test results conform to the optimized parameters, and can meet the current operating quality standards of vegetable graders.

Key words: finishing machine, repressor, hydraulic system, height adjustment, planeness