The WJ4 underground internal combustion scraper is a medium to large tonnage diesel scraper in China, which meets the requirements of mine safety certification and is suitable for scraping, transporting and unloading materials in non- explosive environment mine tunnels and other small tunnels, and can meet the requirements for loading of mine trucks up to 40t in the underground mining process. The machine has a high level of protection and is suitable for wet and dusty environments in underground mine tunnels of 4. 1m x 4. 1m. The machine is highly intelligent, safe and reliable to use and has good overall machine stability, which can significantly improve mine productivity and profitability.