Research On Powder Weighing System Used In Stabilized Soil Mixing Plant

Stabilized soil mixing plant is one of the central road surface engineering machinery and it is the key equipment to mix the soil. The weighing precision and stability of the powder weighing system in this equipment is very import to the quality of cement stabilized soil.The metering methods of the continuous stabilized soil mixing plants should be dynamic and continuous because their working mode. They can be categorized to cubage metering and weight metering in the form of metering methods. If we categorize them in the form of structure, it will be strap metering device, strew metering device and subtraction metering device. Being one of these structures, screw metering device is mature and is widely used in domestic and foreign continuous stabilized soil mixing plants.Based on the technique status and foreign data of continuous stabilized soil mixing plant, the writer put forward the problem of the powder weighing system that the weakness of weighing precision is because the characteristic of cement. Analyzed the structure of several powder weighing system and some data of dynamic calibration on several equipments, and consulted the data, the writer found the doubled-screw weighing system is superior than other system in powder weighing.Followed the theories of powder delivery, a machine was designed in this paper which can weigh powder material with a doubled-screw system.Finally, the writer tested the machine with the method of simulation, and examined the screw which designed in the foregoing chapter. The result shows that the system can maintain good weighing precision and stability in actual working conditions.