| 摘要 |
The bolt magazine (25) consists of two chain pairs (56) which are run over two sprockets (42) and are driven in synchronism by a drive shaft by means of a rigid shaft (43). The link pins (58) for connecting adjacent chain links (57) are extended on both sides of the same and each carry a jaw (59, 60) of adjacent grips (61, 62). The walls of the jaws (59, 60) facing one another carry an insert (63) of friction material in recesses. The associated jaws (59, 60) of the grips (61, 62) are under the pressure of a spring (65) in the closing direction. The positions of the grips are adjusted with a cam plate (73) and a hydraulically actuated locking pin (72) in order to feed the rock bolts (64) to the bolt-setting device by means of bolt-fetching pincers (27). Due to the distributed arrangement of the grips on both sides of the chain, larger quantities of rock bolts can be put in, so that the supply in the case of stable rock is sufficient for two and more tunnel cross-sections. Due to the clamping of the rock bolts in the grips, no guides are necessary, and rock bolts of different thickness and even of different length can be put into the magazine. <IMAGE> |
