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The starting and safety protection system is an important part ofthe explosion-proof diesel engine, and there are malfunctions in the explosion-proof diesel engine, such as difficulty in starting and failure in protection. As a gas working medium, compressed air is safe, reliable, and advantageous in acquisition and storage. Therefore, analyzing the starting principle and safety protection requirements of explosion-proof diesel engines and studying the correlation between the two systems, a set of starting and safety protection systemsusing compressed air as the working medium is designed in this paper. Moreover, the performance requirements of the main components in the system are studied, analyzing and calculating the operating parameters in the system, so that the design plan can be optimized. The problems appearing instarting and safety protection of explosion-proof diesel engines are solved through this system.

A large number of asperities have been left on the solid surface after mechanical processing. Aiming at this complex shape, a laminar flow model between solid contact interfaces is established, and the irregular concavo-convex structure is used to simulate the interface structure in micro-channels, then it is studied for the flow characteristics of incompressible viscous fluids in random micro-channel. The channel of model adopts the form of 2D and 3Dmodel. The interface structure in the microchannel is simulated with irregular micro-convex bodies, and physical quantities such as aspect ratio and length ratio are defined. It is used to analyze the influence of micro-channel on the velocity and pressure of fluid flow by Computer simulation technology. The velocity andpressure of the fluid in the microchannel increase as the area ratio of the micro-convex to the micro-channel increases, the length of the micro-protrusion is not the main factor affecting the fluid flow characteristics, the structure of the micro-convex is is one of the key factor affecting the fluid flow characteristics, they are showed by the simulation results. This research provides certain guidance and reference for solid surface design.

A micro/nano thermal printing system was developed in this paper. The system has the characteristics of high resolution, large imprinting areas, convenient operation and low cost. Some experiments on metallic glass (La-Co-Al) were carried out by the system. The results indicated that this system has the elegant performance and the metallic glass is one of the best materials to fabricate the microstructures.