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1.改进原因水平定向钻机是一种在不开挖地表的条件下,铺设各种地下管道和电缆的施工机械。大型水平定向钻机旋转液压系统最大压力的设定,是通过溢流阀溢流压力来实现的,水平定向钻机旋转液压系统液控溢流阀一旦选定后,其最大溢流压力即为定值,该旋转系统的最大保护压力也为定值。大型定向钻机旋转系统的最大溢流(保护)压力是按照标配(较粗)钻杆的旋转扭矩设定的。当大型水平定向钻机所钻孔径较小时,需通过变径接头使用较细的钻杆。此时因使用的钻杆较细、
1. Reasons for improvement Horizontal directional drilling machine is a kind of construction machinery for laying various underground pipes and cables under the condition of not digging the surface of the earth. The setting of the maximum pressure of the rotary hydraulic system of a large horizontal directional drilling machine is realized by the overflow pressure of the relief valve. Once the pilot hydraulic relief valve of the horizontal directional drilling machine is selected, the maximum relief pressure is a constant value , The maximum protection pressure of the rotating system is also a fixed value. The maximum overflow (protection) pressure for large-scale directional drilling systems is set according to the rotating torque of the standard (coarser) drill pipe. When drilling large horizontal directional drilling holes smaller, through the use of smaller diameter drill pipe. At this point due to the use of drill pipe smaller,