挖掘装载机托架连杆装载工作装置自动调平的方法

挖掘装载机工作装置的"自动调平"是指装载机工作时,随着动臂的举升,可通过铲斗液压缸自动调整铲斗与动臂之间的夹角,防止在动臂举升过程中,铲斗向后倾撒物料,引发事故.论述托架连杆机构装载工作装置自动调平功能的实现方法,即动臂举升到一定位置时停止运动,铲斗正好处于临界撒料状态,然后调整铲斗与动臂之间的夹角,使铲斗前倾,再举升动臂,如此反复进行,直至铲斗达到卸料位置.介绍了实现铲斗自动调平功能的液压系统原理,以及为实现此功能而研制的用于控制铲斗液压缸的反馈机构.对有无调平功能的动臂举升时间进行对比,结果表明:实现自动调平后,动臂举升时间略有增加,但仍处于国家标准规定的7 s以内.研制的自动调平机构已在厦工集团生产的XG765型挖掘装载机上应用,用户反映良好.

Automatic Self-leveling Method for Backhoe Loading Attachment with Support Frame Linkage

With automatic self-leveling, the angle between bucket and boom can be automatically adjusted by bucket cylinder during the boom lifting to avoid accident of backward material spillage of bucket. Method for loader attachment with support frame linkage to realize self-leveling is described. When the bucket reaches its critical condition to spill materials as the boom is lifting, stop the boom, adjust the angle between bucket and boom, tilt the bucket and then lift the boom, repeat the procedure until the bucket reaches its dumping position. Hydraulic system principle diagram to realize automatic self-leveling of bucket is presented and related feedback mechanism to control bucket cylinder is developed. Lifting time was compared between booms with and without leveling function. Results show that the boom lifting time is prolonged slightly with automatic leveling but it is still within the 7s of national standard. The automatic leveling mechanism has been applied to model XG765 backhoe-loader manufactured by Xiagong Group and satisfactory customer respond is obtained.