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Test of cop44-115mm DTH bits

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Test of cop44-115mm DTH bits
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Field test record sheet for DTH bit


Test unit Jiangkou project department Test time 20.APR.18~22.APR.18
Test site Jiangkou, Putian, Fujian Engineering project Quarry
Host model Jinke 590 Main engine speed  
Type of air compressor Life force 780RH wind pressure 21kg
Impactor type Day and 55A Drill diameter Φ138
Borehole angle 90° Borehole depth 15 m / hole
Rock type   Rock hardness F12-14
Bit manufacturer Qi Deli, Black King Kong, Tian He Alloy tooth manufacturer New sharp、Zhuzhou 601
Alloy XR06A、YK05 Tooth profile Parabolic tooth Φ18、Φ15、Φ14
Operator Master Yang 18824739098
Bit number Stratum Single pole drilling time Footage Remarks
QIDELI -1 F12-14 4-4.5min 365m 23 hole X15m+10 hole X2m=365m,Gauge buttonΦ18、Front buttonΦ15、Top button Φ14
Changsha xxxxx F12-14   about 350-400m Gauge button Φ18 Front button Φ16 (Conical tooth)


Failure form of drill bit

1. By observing the failure bit, it is judged that the failure modes of the two manufacturers are basically the same. Both of them are serious wear and tear of the reservoir and late edge tooth failure.

2. the odd teeth are the same as those of Tian Ho's DTH Drill bits, and the middle teeth are different.

3. Chidley DTH bit did not break teeth or reservoir in the early and middle period of operation, and the final footage meter was approved by the operator.

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Signature: Huang Yongkang 22.April, 2016


Pub Time : 2019-03-01 16:47:45 >> News list
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