aiming at the shortcomings of present anchor pole detector,this paper adopt advanced embedded technology,design a non—destructive anchor pole stress measuring instrument for underground coal mine,this device is characterized by highly intelligent, small size and operation simple.

Authors make use of JL—MG bolt integrity testing survey meter to have non—destructive test for Jingying highway bolting integrity according to stress wave principle.

The results further describe the mechanics of the impact of the hammer and rock bolt and creates the condition for the improvement of the engineering detection quality in the rock bolt nondestructive dynamic detection.

A mechanics model of dynamometry bolt was given and it was shown that dynamometry bolt mainly bear tension and torque in real application.

The working relationship map between dynamometry bolt and surrounding rock is proposed.

Based on the principle of the linear relation between nut kinetic frictional tightening torque and axial pre-tightening force of anchor stem which is indirectly measured through measuring the tightening torque,the intrinsically safe portable dynamometer for anchor stem in mine is developed with the ultralow-power MSP430 serial SCM and peripheral circuit.