. The slippage often occurs between conveyor belt and driving drum, reduces the transmission efficiency and even causes accidents due to lack of enough friction. By the analysis of friction drive principle in belt conveyor, three ways were presented to increase the frictional traction. Learning from the bionic tribology theory, we proposed a new structure design of the drum coating layer surface. The micro contact area of fly's seta that can adhere to any surface was taken as a prototype, and its microscopic structure was analyzed, then the surface structure of coating layer with recess long blocks was designed, finally, the solid modeling was created with CAD software. The new surface has sub atmospheric pressure absorption. The purpose is to increase the friction between conveyor belt and driving drum, and to avoid the slippage.

In order to study the influence of convex hull density on friction contact of bionic surface, we observed the 3-D structure of locust, tree frog and grasshopper with the 3-D microscope system, the experiments show that there convex hulls(diameters are 4um-6um)on the unsmoothed surface of feet pads; based on that structure the paper designs four kinds of unsmoothed bionic surfaces with different densities(center distances are 2R, 3R, 4R and 5R), the four contact models built by ANSYS are solved at the same loads and constraint condition, results indicate that the elastic deformation on top surface of convex hull is minimum (about 1.000mm) and the maximum (2.135 mm) appears on the midpoint of neighboring convex hulls, and the elastic deformation would increase with the decreasing of convex hulls’ density, big and small density would decrease the contact pressure also. We conclude bionic unsmoothed surface with appropriate density would put up satisfying contact performances and the surface3（center distances is 4R）we designed provides a good reference for bionic surface design and fabricating.

According to the coal mine underground work place humidity changes affect the measurement precision of dust concentration, improper spray cause coal with the water loss and wastes a lot of water resources, the paper put forward a correction factor of dust concentration based on the relative humidity, establish the relation model of concentration and humidity. The test results show that: the dust concentration correction factor and relationship model of concentration and humidity are effective and scientific, it has better practicability to solve the problem of underground coal mine.

Based on the observation and research of the macroscopic and microscopic foot pad of tree frog, we analyzed the influence of the surface topography of tree frog’s foot pad on its adhesion, and got the macroscopic and microscopic typical characteristics of the surface topography of tree frog’s foot pad, a bionic surface with hierarchical structure was designed, which had the advantage of increasing friction and had many important applications in life and engineering.