1. Install upper and lower level gauges on the raw material silos to control the start and stop of the feeding device. This ensures a continuous supply of sufficient material to the feeding equipment.
2. Feeding Device: Dry-mixed mortar uses a large amount of raw materials, resulting in numerous raw material silos (e.g., 9 main silos, 6 auxiliary silos, and 2 metering and batching silos). Due to the long conveying distance, a closed screw feeder is suitable as the feeding device. For materials with good flow characteristics, a larger screw feeder is generally used for rapid feeding; a smaller precision screw feeder is used for fine feeding. The working time, operating mode, and early shutdown time of both types are determined during on-site commissioning. To ensure continuous and stable feeding, the screw feeder speed should not be too high; the pitch-to-diameter ratio should generally be ≤0.5. For precision screw feeders used for fine feeding, it is best to add a frequency converter so that the speed gradually decreases to a stop when approaching the rated capacity. This design scheme generally achieves a feeding accuracy of ±0.3% or higher. To ensure production cycle time, the screw feeder used for rapid feeding should be of a larger specification, with a feeding capacity of no less than 130% of its rated capacity. Due to the pulsating nature of the screw feeder's discharge, material collapse may occur after the screw feeder stops, affecting the accuracy of batching. A quick-closing valve should be installed at its discharge port, closing rapidly simultaneously with the screw feeder's stop. For feeding devices where the horizontal distance between the raw material silo outlet and the metering batching silo inlet is relatively short, a precision segmented wheel feeder unit and a smooth-flowing chute can be used as the feeding device.
3. Dust Removal System Design. The dust removal system is a critical part of the dry mortar production line design. It is necessary to ensure dust removal efficiency to maintain material stability and the production environment. For example, the airflow attenuation of the dust removal fan should be controlled within the agreed range to avoid exacerbating material stratification.
4. Safety Design Considerations. Safety facilities must be considered simultaneously during the design phase, complying with the "three simultaneous" requirements for safety facilities in construction projects. For new processes, their safety technical characteristics must be understood and mastered, and effective safety protection measures must be taken.
