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直井生产过程中，提升材料与石渣、人员上下、放炮后留在井架上或背板与井壁间的碎石以及未支架部分悬石的下掉，都会给井下工作者带来危险。为了防范这种危险，曾创造了许多防护设备，但都因操作不便，不甚理想。最近，在安全活动月中制成了一种安全门，将这种门设置于靠近工作面2—5米处，经过试验与实用证明，具有良好的防护性能和经济价值。
In the production process of vertical wells, lifting materials and gravel, personnel up and down, blasting on the derrick, or the gravel between the back plate and the well wall and the falling of the unsupported part of the suspended rock will pose danger to the underground workers. In order to prevent this danger, many protective equipments have been created, but they are not ideal due to inconvenient operation. Recently, a security door was constructed in the month of the safety campaign. This door was set 2-4 meters away from the working surface. After tests and practical proof, it had good protection performance and economic value.