Wet gunite machine (commonly known as wet shotcrete machine), which enters the shotcrete machine is the concrete mixture that has been mixed with water evenly. Therefore, the dust content in spraying is low, the amount of concrete rebound is greatly reduced compared with the dry spraying process, the slurry drop is less, the loss is small, and the construction quality is more scientific. At present, the wet spraying process is a more ideal spraying method. However, the wet material is easy to condense in the material pipeline, causing blockage and troublesome cleaning. The promotion and use must strengthen the regular operation and maintenance of the equipment. At present, it is most widely used in various national-level projects such as tunnel walls, tunnel vertical shotcrete, high-grade highway slope protection, high-speed rail, and subway foundations that focus on engineering quality. Most of the shotcrete machines produced by Henan Yugong are wet shot machines.