| 摘要 |
An apparatus for drilling vertical temperature measuring holes in the top brick of coke ovens includes a guide support vertically fixedly mounted on a horizontal frame on the top surface of a coke oven proper, and a guide pipe shaft connected at its upper end to a rotary drill, having a freely replaceable drilling bit attached to its lower end and including therein a cooling gaseous body passage is vertically movably mounted on the guide support in parallel thereto. In drilling operation, a first core bit with square chips is attached to the lower end of the guide pipe shaft and the top brick is first drilled to a depth of at least five times of diameter of the hole to be drilled while jetting a cooling gaseous body and cooling the core bit. Then, the bit is replaced with a second core bit with circular chips and the hole is drilled further down to near the desired depth while similarly cooling the bit and then the second bit is again replaced with a planar type drill bit with ventilation holes thus plaining the hole bottom while cooling the drill bit and thereby vertically drilling the high temperature brick without greatly damaging the inner wall of the drilled holes.
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