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NH-4型打桩机在使用一段时间以后,经常发生锤头缓冲垫燃烧现象,即连续沉桩十一根后锤头缓冲垫开始燃烧;强制冷却后,延续沉桩到第41根时,锤头缓冲垫全部烧毁。需拆卸锤头,更换缓冲垫,因而增加成本,降低了设备的使用效率。1 故障现象NH-40型锤头重4t,直径660mm,最大打击力近200×9.8×10~3N,高压下产生的高温近300℃左右。而木制缓冲垫的使用温度为200℃。由于桩的长度、截面积规格不同,每沉桩一根
After the NH-4 type pile driver used for a period of time, the phenomenon of combustion of the hammer head cushion often occurred. That is, after the 11 piles were continuously piled, the hammer head cushion began to burn; after forced cooling, when the pile was continued to the 41st, the hammer was hammered. The head cushions are all burned. Need to disassemble the hammer head and replace the cushion, thus increasing the cost and reducing the efficiency of the equipment. 1 Failure phenomenon NH-40 hammer head weight 4t, diameter 660mm, the maximum impact force of nearly 200 × 9.8 × 10 ~ 3N, the high temperature generated under high pressure near 300 °C. The use temperature of the wooden cushion is 200°C. Due to the different lengths and cross-sectional areas of piles, one pile per pile