平顶山矿务局四矿,将原使用的西德贝考瑞特公司制造的2/3.9型支撑掩护式支架(支架最低高度2.0m,最高为3.7m),改制成工作面下出口的端头支架。他们的办法是:利用原支架在前梁的前端又铰接一根前梁,使支架宽度不变,长度加长到7.3 m,外加一根原支架的立柱作支护,共改制二架,接在下机巷出口处,截止82年5月已回采二个面共出煤104万吨、情况良好。后又在西德赫姆夏特G320— Pingdingshan Mining four mines, the original use of West Germany Beike Ruite company manufactured 2 / 3.9-type support shield bracket (bracket minimum height of 2.0m, up to 3.7m), converted into the face under the export of the first Bracket. Their approach is: the use of the original bracket in front of the front beam and a hinged front beam, so that the same stent width, length increased to 7.3 m, plus a stand for the support of the original bracket, a total of two changes, then the next machine Alley exit, as of May 1982 has been mining two face a total of 1.04 million tons of coal, in good condition. Later in West Germany, Sharq G320-