Through analyzing shortcomings to internal spraying system of AM-50 driving machinery,soft pipe through ranging arm pipe road was changed and became wate road on ranging arm deceleration box,reverse punching filter was strengthened,spray head was optimized,spraying results was raised with infernal spraying system,good economic results and scientific result were gained.

Study on pre-mixed air spraying system;

The double fluid fume spraying system was used in reconstruction of the cooling system of 1000 m3 blast furnace gas of Maanshan Iron & Steel Co.

This paper proposes several methods and measures of the improvement of spraying system in Model EBZ- 120 tunneller, which used in most coal mines throughout our country, according to the questions arising in the application of it.

Failures tree and reliability analysis of roadheader spray system;

Improvement on outer spray system of EBH-120 Roadheader;

This paper introduces the dedusting principle of the spray system of roadheader, and the problem existed in the spray system of EBZ-160 Roadheader, brought forward the suggestion on the technological improvement on the spray system of EBZ-160 Roadheader to improve the dedusting effect to meet the requirement of modernistic coal mine.

Design and development of water spray fire extinguishing system;

In the light of the specific engineering project, the paper summarizes the main design and construction points of the water spray fire extinguishing system and it also gives the solution to the questions existing in real projects.