Compared with the dry spraying, the wet spraying process of the mine wet shotcrete machine has added a quick-setting agent addition system and a feeding and stirring system in addition to the spraying system, and the volume and weight of the mine wet shotcrete machine have increased. The underground coal mine has a small cross section, is paved with tracks, and is also equipped with other equipment, which is very inconvenient to work. This is a problem that needs to be solved in the promotion and use of the mine wet shotcrete machine. There are many problems that need to be solved in the promotion and application of the mine wet shotcrete machine.
The mine dry shotcrete machine needs to be connected with the spraying pipeline, gas circuit, circuit, and water circuit, while the mine wet shotcrete machine needs another circuit and quick-setting agent pipeline. The weight of dry shotcrete machine for mine is about 600 kg, and the weight of wet shotcrete machine for mine is 1500 kg. The workload of transferring wet shotcrete machine for mine is obviously larger. After the spraying, the dry shotcrete machine for mine only needs to be cleaned with wind. The wet shotcrete machine for mine must be cleaned with water; the residual concrete and quick setting agent in the machine must be added to the speed in the system. The coagulant is flushed with water, otherwise the machine will be unusable the next time. The mine dry shotcrete machine is to use the mine car and other equipment to send the dry mixed concrete to the working surface, and manually feed the concrete shotcrete machine to spray the slurry. After the introduction of mining wet shotcrete machine, the traditional concrete mixing and transportation technology can no longer meet the requirements. The underground engineering has the characteristics of small demand for concrete in a single operation, wide working points and constantly changing construction sites, which requires long-distance transportation. Therefore, solving the long-distance transportation has become the key to the popularization and application of mine wet shotcrete machine.
Because the structure of mine wet gunite Machine is more complicated than that of dry sprayer, the difficulty of maintenance is higher than that of dry sprayer. In addition, when the workers operate the mine wet gunite machine, improper use may cause personal injury, because the coal mine chamber is small, the pungent odor generated by the liquid accelerator cannot be emitted, and the liquid accelerator is strongly alkaline and splashed. The human body will cause personal injury.
