Anti-sloughing hole reverse circulation sampling bit

Abstract

The invention discloses an anti-sloughing hole reverse circulation sampling bit comprising a bit body with an inner cavity and a hollow annular ejector arranged in the bit body. One end of the bit body is provided with inner, middle and outer cutter heads from interior to exterior, a sampling port is arranged on the inner cutter head, a clearance groove used for slagging is arranged between the middle and outer cutter heads, an annular ejector is fixedly arranged in the cavity of the bit body and forms an annular cavity with the inner wall of the bit body, and the sampling port is communicated with the hollow annular ejector; the bit body is provided with an ejecting hole correspondingly, and the ejecting hole is communicated with the annular inner cavity. The bit is easy to operate and is capable of sampling from soft and outburst seams rapidly and accurately, the sampling time is saved, the sampling depth is increased, the mine sampling efficiency and safety are improved, and the rate of gas accidents is decreased.

Description

technical field [0001] The invention belongs to the field of drill bits, in particular to an anti-collapse hole reverse circulation sampling drill bit. Background technique [0002] At present, the management of coal mine gas disasters is mainly based on regional prevention and control, supplemented by local measures. The rapid measurement technology of regional gas parameters has become an urgent problem to be solved. Therefore, deep hole sampling is the primary problem that needs to be solved. Existing deep gas sampling methods mainly include: core pipe sampling, auger drilling to connect pulverized coal, compressed air ejection sampling, etc. The sampling time of these sampling methods is generally about 30 minutes during the sampling process, and the sampling depth is about 30 minutes. About 30 meters. The main reason lies in the drill bit. The use of this common drill bit has slow sampling speed and shallow sampling depth, which causes the problems of long sampling tim...

AI Technical Summary

Problems solved by technology

The main reason lies in the drill bit. The use of this common drill bit has slow sampling speed and shallow sampling depth, which causes the problems of long sampling time and inability to sample at fixed points in the actual sampling work, which seriously hinders the production efficiency of coal seam mining and restricts the development of productivity.

Images