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我厂生产的300米岩心钻机是一种机械传动、液压给进和操纵的立轴式钻机。它的代表产品先后有XU300-2型、XU300-2A型和XY-2型钻机。它们的液压系统的主要区别在于：XU300-2型和XU300-2A型钻机的液压系统，是由定量的齿轮油泵供油，采用了调压溢流阀的旁路调压回路和多路换向阀（13—0）操纵的方向控制回路。它所采用的大部分液压元件与五十年代的产品基本一样，一直未加以改造。这种液压系统也是一直沿用下来，它存在着许多不合理的部分。XY-2型钻机，则是1982年底经部级鉴定，并于1984年起形成了批量生产能力的新产品。同时还派生
The 300-meter core drill rig produced by our factory is a vertical shaft rig with mechanical transmission, hydraulic feed and operation. Its representative products are XU300-2, XU300-2A and XY-2 drilling rigs. The main difference between their hydraulic systems is that the hydraulic systems of the XU300-2 and XU300-2A drilling rigs are supplied by a fixed gear oil pump, a bypass pressure regulating circuit with a pressure relief valve and multiple commutation The direction control loop operated by the valve (13-0). Most of the hydraulic components it uses are basically the same as those in the fifties and have not been modified. This kind of hydraulic system has also been used all the time. It has many unreasonable parts. The XY-2 drilling rig was approved by the ministerial level at the end of 1982 and formed a new product with mass production capacity in 1984. At the same time also derived