The use of medium concrete mixer must strictly abide by the "Safety Technical Regulations for the Use of Construction Machinery". Before use, the power equipment, working mechanisms and supporting lifting and transportation pouring equipment must be carefully checked.
Starting and feeding of medium concrete mixer: The mixer must be started at no load and charged during operation, otherwise the machine will be damaged due to excessive starting torque. When medium concrete mixerwith a mixer, the input amount must be calculated according to the specified ratio of ingredients and water-cement ratio. The humidity of coarse and fine aggregate should be measured in advance, and the theoretical mixture ratio should be converted into the construction mixture ratio. The capacity calculates the mass of each constituent material to be added each time. The calculated value of the feed should be tested and implemented strictly once it is determined. The particle size of the largest aggregate should meet the requirements. The requirements for the maximum aggregate particle size of the compulsory mixer are more stringent. Otherwise, jamming will occur. If the added material changes or the humidity changes due to rain, snow, etc., it should be re-measured, and the amount of feed added should be recalculated and determined. Important concrete structures, expense ratios and water-cement ratios should be checked every 4 hours.
When adding materials to the mixing drum, the traditional methods are: (1) first load sand, then add stones and cement in sequence, and add water in time; (2) first add part of the water and sand, and then add the stones, cement, and the remaining water Loading; (3) When using a hopper to feed, the material should be fed into the mixing drum within 15 seconds in the above order. The above method can avoid cement sticking to the bucket wall, reduce wear and improve productivity, but the strength of the medium concrete mixer is reduced, and the cement consumption is large; it is best to use the stone-wrapping method of mixing the cement slurry first.
It must also be pointed out that the feeding capacity of the medium concrete mixer should conform to the mechanical capacity. Too small will reduce the productivity; too large will not only increase the load of the power machine, but also cause the concrete slurry to spill and splash, and the mixing efficiency will decrease. In addition, when the current concrete has not been completely unloaded, new mixing materials must not be charged.
