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Drilling along a specified route is required in more and more applications. This paper introduces a path controllable drilling device based on fluid power, which requires no electric power and thus especially suitable for mine rescue. The mechanism design, control method and working mode of the most important part of the device, a 3-DOF hydraulic steering system, are illustrated. An analytical model is also provided to estimate the invisible posture and orientation of the steering system and thus the drilling path of the device as working underground.

The knife-gap accuracy of rolling-cut bilateral shear is one of the key factors influencing the cutting quality. This paper through the site of a high strength low alloy steel shear test, a linear regression equation for the relation between knife-gap and plate thickness is obtained and optimize by using MATLAB Toolbox, after optimization of the linear regression equation can be conveniently used, reduce knife-gap adjustment time, improve production efficiency, reduce shearing defects.

Simple description the background of hydraulic hybrid technology, scope of application. Put forward the idea of hybrid hydraulic system design based on the car's braking performance, the main elements parameter calculation. Simulation results show that the braking process is smooth, brake energy recovery, the system design and parameter calculation of reasonable.