首页|Switching mechanism and optimisation research on a pressure-attitude adaptive adjusting coal seam waterjet slotter

Switching mechanism and optimisation research on a pressure-attitude adaptive adjusting coal seam waterjet slotter

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To investigate the attitude-switching mechanisms of existing jet slotters,which integrate drilling,punch-ing and slotting operations,and to improve its fracture ability,we used the power bond diagram theory to analyse the dynamic flow pressure,and force of slotters.A mathematical model was developed for the dynamic characteristics of slotter systems.Furthermore,to study the effect of the main characteristic parameters on the ability of the nozzle to erode sandstone,multi-orthogonal experiments were carried out.And the optimised slots were applied in later practical operations.The research results show that the inlet fluid passed through the time-varying orifice to generate pressure differential thrust,which overcame the spring force,pushed the valve core to open the side nozzle,and closed the rear cavity chan-nel thereby realising the switch of the slotter attitude.An optimal plan was established to balance the diameter,depth,and volume of punching,and a rock-breaking plan was developed for the slotter.Subsequently,the optimised water jet slotter was practically used in coal seam gas drainage.Compared with conventional dense drilling,waterjet slotting technology significantly improves the abil-ity,efficiency,and effect of increasing the permeability of the coal seam.

Gas drainageWater jet slottingPressure-attitude adaptive adjustmentPower bond diagramMulti-index orthogonal testGas drainage practice

Yiyu Lu、Yangkai Zhang、Jiren Tang、Qi Yao

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State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China

School of Resources and Safety Engineering,Chongqing University,Chongqing 400030,China

National Natural Science Foundation Outstanding Youth Fund重庆市自然科学基金Program for Changjiang Scholars and Innovative Research Team in Chongqing University

51625401cstc2018jcyjAX0542IRT17R112

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(6)
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