Horizontal direction drilling machine power head construction optimize analysis and test research;

The mechanical analysis and the cutting analysis for power head are done.

A protecting joint is added at power head rod joint in order to prevent power head rod joint abrasion when rod is screwed or unscrewed.

It is dificult to set up a mathematical model to describe working process of power unit system and predict its performance.

The relation between parameters suce as diameter,length,lead of the mobile ground anchor and properties of physical mechanics of soil,etc with driving torque of power unit of the mobile ground anchor vehicle is described through theoretic calculation methods and experience formulae.

The paper emphatically introduced current horizontal directional drilling rig both in China and abroad about the transmission and driving mode of the power unit,feeding mode of feeding mechanism,clamping and loosing device,the chassis and the mechanism of drill stem mounting & dismounting device with the analysis on their advantages and disadvantages.

Optimal design of driving head of hydraulic drill for underground anchorage;

Aiming at the problem that rotary roofbolters are not suitable for hard terrane,the valveless hydraulic impact-rotary driving head of roofbolter was proposed.

JDY-1500 drilling rig is a kind of driving head drill with fully hydraulic driving and long feeding.

Development of hydraulic top-drive of JWR-II water-well drilling rig;