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由石油勘探开发科学研究院机械所研制开发的深井、越深井钻机用PSZ75型液控盘式刹车系统于1999年9月15日～17日在宝鸡石油机械厂生产的7000m电驱动钻机JZ70D上进行了整机试验。整个试验一次成功，通过了集团公司监造组及油田用户的验收。该系统于1999年2月完成了加工制造、室内
Developed by the Institute of Petroleum Exploration and Production Machinery Deep well deep drilling rig PSZ75 type liquid-controlled disc brake system on September 15, 1999 to 17 in Baoji Petroleum Machinery Factory 7000 m electric drive drill JZ70D carried out Machine test. The whole experiment was successful once and passed the inspection and acceptance of Group Supervision Group and oilfield users. The system in February 1999 completed the manufacturing, indoor