Generally, the general dry mix mortar production line requires that the sand sieve be divided into four particle size grades of 0-0.6 mm, 0.6-1.18 mm, 1.18-2.36 mm, and 2.36-4.75 mm. For special mortars, the classification requirements for sand are finer.

The influence of sand grade on the quality of dry mix mortar is very large. The gradation of reasonable aggregates has a low void ratio, and a good skeleton can be formed in the mortar, which can save cement and obtain good workability and compactness mortar. On the other hand, if the sand gradation is unreasonable, the mortar produced is poor in workability and fluidity, especially in the mechanized spraying construction, which may cause problems such as pipe blocking, which is not conducive to mechanized construction. Different types of mortar products require corresponding grades of sand. Therefore, the equipment must have a grading and screening function. The screens are adjusted by different grading and screening specifications, and the dry sand screens are divided into graded sands of different particle sizes to meet different varieties. The demand for dry mixed mortarand for dry mix motar production line.
Dry mix mortar production line can achieve grading adjustment, grading screening and precision control of sand. The dry sand is first sieved through a single-vibration screen to remove large particles (>5mm) and then transported to the top layer of the probability sieve for grading and screening. Probability screens are arranged in a multi-layer screen with a wide range of sieve sizes to meet a variety of formulation requirements. Separate sands of different particle size ranges as needed. In addition, the probability sieve has a large effective screening area, high screening efficiency, and low energy consumption. The screen and the inspection cover adopt a quick tensioning device, which can be easily disassembled and assembled without a wrench, and it is convenient to maintain and replace the screen. Can work continuously and automatically discharge. The design has a special cleaning device to ensure that the net is not easy to block.
With the depletion of sand resources in the river, many mortar production enterprises now take machine sand as raw material and use sand making equipment to directly support the dry mix mortar production line. The machine sand obtained after the gravel is broken and shaped has a low water content, which can avoid the drying link and directly enter the screening link.