1PJ-4.0型水田激光平地机设计与试验

设计了三点悬挂1PJ-4.0型水田激光平地机。水田激光平地机液压系统,包括高程液压油路、水平液压油路和折叠液压油路,平地铲高程运动采用平行四连杆结构。对水田激光平地机的高程运动和水平运动性能进行了测试试验,分析结果表明:平地铲上升过程响应时间为下降过程响应时间的2倍,全程400 mm上升所需时间为3.31~4.23 s,下降所需时间稳定在1.7 s左右;上升速度随油门开度增大而加快,平地铲下降速度较稳定。平地铲水平调节时,顺时针转动全程20°所需时间与逆时针转动所需时间一致。田间平整作业试验表明,与拖拉机配套的三点悬挂1PJ-4.0型水田激光平地机可以稳定工作,能显著改善田面平整情况,田面最大高程差从平地前的32 cm降低到4.9 cm,相对高度的标准偏差值从平地前的12.28 cm下降到平地后的2.64 cm,平地后绝对差值小于等于3 cm采样测量点累计百分数达69.4%。

Development of 1PJ-4.0 Laser Leveler Installed on a Wheeled Tractor for Paddy Field

A 1PJ-4.0 laser leveler installed on a wheeled tractor through the hydraulically driven 3-point linkage is developed. The harrow of the laser leveler can move up and move down by a cylinder and a planar four bar linkage. Hydraulic systems of the laser leveler are designed, including height position control hydraulic system, leveling control hydraulic system and folding hydraulic system. Experiments are carried out to investigate the dynamic response characteristics of the height position control system and leveling control system, respectively. The response time of leveling harrow moving up is almost twice as much as moving down. The moving up velocity of leveling harrow increases with the rate of accelerator pedal deepness, while the moving down velocity of leveling harrow is stable because a one-way throttle valve has been applied in the height position control hydraulic system. The average moving up time is about 3.31~4.23s and the move down time is 1.7s in testing space of 400mm. It is bilateral symmetry of rotate angular velocity in the clockwise and reverse to control plow leveling. The results of the paddy field experiment show that the laser leveler installed on wheeled tractor for paddy field can work steadily, and the surface smoothness of paddy field can be obviously improved. The maximum height variation of paddy field surface decreases from 32cm before leveling work to 4.9cm, and the relative standard deviation reduces from 12.28cm to 2.64cm. The cumulative percentage of the sampling points, which have smaller than or equal to 3cm of absolute difference value, is more than 69.4%.