Key performance of wet spraying machine
2021-02-21
Wet shotcrete machine plays an important role in shotcrete support operation with its excellent performance. It adopts advanced wet spraying mode, which is environment-friendly and dust-free, improves the working environment, has low rebound rate and high material utilization rate. Due to the special process of wet spraying, the material mixing is more uniform, the spraying effect is good, and the shotcrete layer concrete is dense, uniform and high strength. These many excellent characteristics need to be guaranteed by a key technology, that is, the transportation system of accelerator. An excellent accelerator conveying system can ensure the above excellent spraying effect. This system should be composed of an accurate metering system and a strong conveying system. If the metering is not accurate, the accelerator addition may be inaccurate. Generally, the accelerator addition amount is about 5% of the cement. If the addition amount is too small, it will not achieve the effect of rapid solidification, The sprayed concrete layer will collapse or segregate due to too long setting time, resulting in poor spraying quality, affecting the strength and flatness of the spraying layer. In serious cases, it will cause a large area of falling off of the spraying layer and poor effect. If the addition amount is too large, expensive accelerator will be wasted, resulting in high cost. Too much accelerator will reduce the later strength of the spraying layer, increase the rebound rate, and fail to achieve the ideal spraying effect. Therefore, accurate measurement of accelerator addition is very important in wet spraying process. The delivery system of the accelerator needs enough pressure to accurately deliver the accelerator in place according to the quantity. The delivery system is generally composed of a pumping system. Generally, the plunger pump with large delivery pressure is selected. This pump is generally driven by the motor forcibly, and the delivery pressure reaches more than 1MPa, exceeding 0.4MPa of the injection system, which can ensure the accuracy of the delivery process, The accelerator will not be transported in place according to the set metering due to the problem of transportation capacity. The transportation is more stable, the transportation distance is long and the metering is more accurate. Some commonly used pneumatic diaphragm pumps have limited pressure due to the use of system wind pressure of 0.4MPa. After measurement, due to the same pressure as shotcrete, they can not smoothly and accurately transport sufficient accelerator in place. In the middle, there will be a part of measurement loss, resulting in the inconsistency between transmission and measurement, affecting the spraying effect. Generally, the farther the spraying distance is, the more obvious this effect is. In extreme cases, it may cause transportation failure. However, due to the low price of pneumatic metering pump, it has been applied by some manufacturers. For those with high requirements on injection quality, these effects should be fully considered. A wet spraying machine equipped with powerful motor-driven plunger pump metering and conveying system is the priority to ensure the injection quality, so as to achieve the real injection effect, have the practical significance of wet spraying, achieve the ideal injection effect, environmental protection, no dust, low rebound rate and high material utilization rate, The shotcrete layer is dense, uniform and high strength.
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