1961年1月在民主德国弗莱堡城举行了有关采矿工作中冲击式钻眼问题的会议。介绍了9篇报告的简要内容。其中一篇阐述了中型凿岩机的设计和在制造Hθkulθ_s型凿岩机的某些部件时应用合成材料的问题。使用夫尔柯兰可以使凿岩机重量减少5.5公斤（35％）。证实，如果仅增加活塞每一冲击的功率，则凿岩机的功率不会增加。应用双活塞系统可以延长 In January 1961 a meeting was held in Freiburg, Germany, on percussive drilling in mining operations. Introduced the brief content of 9 reports. One of them addresses the design of medium rock drills and the problem of using synthetic materials in the manufacture of certain parts of the Hθkulθ_s rock drill. With Falkland you can reduce the rig’s weight by 5.5 kg (35%). Confirmed that if only the power of each impact of the piston is increased, the power of the rock drill will not increase. Double piston system can be extended