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为挖掘现有设备潜力，内蒙地质局在总结各队改进经验的基础上，于81年初组织专业技术力量，对原DPP-100型汽车钻机从结构上进行了较全面的改革，即现在的YC-120型液压车装钻机。经我局系统鉴定会议通过，已正式投入生产。现将主要改革部份分述如下：一、钻机部分（一）增加了液压给进装置在原转盘箱壳上、下平面部分各增加一块支板。以最小中心距（440毫米）搪孔，安装XU-300-2型钻机给进油缸两个。其横梁部分设置一个小油缸，用以控制卡柱式不停车倒杆装置，从而达到油压给进，油压倒杆。
In order to tap the potential of existing equipment, the Inner Mongolia Geological Bureau, based on summing up the improvement experience of each team, organized professional technical forces at the beginning of the year 81 to carry out a more comprehensive reform of the structure of the original DPP-100 car drilling rig, namely the current YC. -120 hydraulic loading machine. After passing the appraisal meeting of the Bureau of the Bureau, it has been officially put into production. The major reforms are now described as follows: 1. Part of the drilling rig (1) The hydraulic feeding device was added to add a support plate to the upper and lower plane parts of the original carousel case. With a minimum center distance (440 mm) boring holes, install the XU-300-2 drilling rig to two inlet cylinders. A small oil cylinder is arranged on the cross beam portion to control the post-type non-stopping reverse pole device so as to achieve the oil pressure feed and the oil pressure reverse rod.