China University of Mining and Technology (cumt)

Manchao He

Zhibiao Guo

Jun Yang

Xiaoming Sun

Jiong Wang

Guofeng Zhang

A fractured roofmining method entry-side anti-collapsed structure, one working face of themining method corresponds to one roadway but without retaining any coal pillar, the roadway retains an entry after the previous working face implements mining top-cutting pressure release, and a roof of the roadway is arch-shape, directional cutting is conducted on one side of the roadway, and the cutting angle is between 15-20 degrees. One working face corresponds to one roadway but without retaining any coal pillar when underground mining is conducted, which can save resources and improve recovery rate of mining. And, the roof of the roadway of the retained entry is arch-shaped, which can improve safety and ensure safety of the coal mining working face. In addition, a cutting angle is 15-20 degrees, which can effectively determine a roof caving direction after top-cutting and reduce affect to the retained entry.

Fractured roof 110 mining method entry-side anti-collapsed structure

A dynamics performance testing system, for use in testing the dynamics performance of an anchor rod or an anchor rode, comprising a main machine and a measurement and control system. The main machine comprises a vertical machine frame (), a clamping apparatus () arranged on the top of the vertical machine frame () and used for vertically clamping the top end of a sample (), where the sample () is provided at the bottom end thereof with a tray (), a drop-hammering apparatus () used for being dropped vertically from the vertical machine frame () at a set height to impact the tray (), a lifting apparatus used for lifting the drop-hammering apparatus at the bottom of the vertical machine frame () to the set height, and a protection apparatus used for physical protection and isolation to reduce bodily injury and noise. The measurement and control system controls the drop-hammering apparatus to select a parameter for drop-hammering and a process of lifting and dropping. The real-time impact on the tray () when the drop-hammering apparatus is dropped vertically is sensed by a force sensor, while real-time impact data received from a sensor device is analyzed, and a test result is outputted. The dynamics performance testing system is provided with versatility while the test result is accurate and reliable.

Dynamics performance testing system

A tension meter of an anchor rod with constant resistance and large deformation comprises a pull rod and a hollow jack. The meter further includes: a rotation device for controlling the rotation angle of the hollow jack; a lifter for adjusting the height of the hollow jack and the rotation device; a first hydraulic pump for driving the hollow jack, wherein the hollow jack is fixed on the rotation device mounted on the lifter. The meter has a large measurement range and a high load capacity.

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Beijing, China

Zhibiao Guo