Down-the-hole drill reverse circulation flushing system

By designing a reverse circulation flushing system for down-the-hole drilling rigs, and utilizing the dynamic flushing function and mode switching of high-pressure air, the problems of sedimentation and cooling on the inner wall of the drill pipe were solved, achieving efficient slag removal and cooling, extending equipment life, and improving the continuity and intelligence of operations.

CN224413577UActive Publication Date: 2026-06-26ZHEJIANG ZHIGAO MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG ZHIGAO MACHINERY
Filing Date
2025-07-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing reverse circulation systems for down-the-hole drilling rigs, impurities and scale easily accumulate on the inner wall of the drill rod, leading to a reduction in the channel diameter, decreased slag removal efficiency, poor drill rod cooling, short equipment lifespan, and high maintenance costs.

Method used

A reverse circulation flushing system for down-the-hole drilling rigs was designed, including a flushing valve body and a through pipe. The system achieves dynamic flushing function through high-pressure air. By combining mechanical structure and fluid control, the system can switch between flushing mode and reverse circulation mode. The modular design facilitates maintenance.

Benefits of technology

Real-time slag removal and cooling can be achieved without stopping the machine, improving operational continuity, extending the life of the valve core unit, and enhancing system efficiency and operational intelligence.

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Abstract

The utility model discloses a down -the -hole drill anti -circulation flush system, including the flush valve body between being arranged in the rotary head part and the deslagging pipe, the flush valve body cooperation of using is installed between the rotary head part and the rotary head adapter pipe. The utility model discloses the cooperation of using of flush valve body and pipe, need not stop the machine to start dynamic flush function, and high -pressure air carries out real -time deslagging and cooling to double -walled drill rod, and the deslagging efficiency is promoted, and the operation continuity is improved, realizes efficient on -line maintenance, the cylinder of outer square inner circle cooperates with copper sleeve, makes the valve core unit wear rate reduce, prolongs the service life of valve core unit, and the cooperation of mechanical structure and fluid control realizes the switching of the system in " flush mode " and " anti -circulation mode " provides technical support for the mine automation construction.
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