Quasistatic pressure compensation and correction of the weighing process in discontinuous asphalt mixing plants

摘要

The invention relates to a quasistatic pressure compensation and correction of the weighing method in discontinuously operating asphalt mixing plants, in particular the pressure measurement by means of pressure transmitter and an associated corrected weighing process during the mixing process using non-dried recycling material. Problem According to legal requirements, prescribed amounts of recycled material are processed and added to the mix. The recycling material contains according to the weather conditions water, which is introduced with the other still hot aggregates in the agitator and evaporates abruptly. The weighing method is affected as a result of the pressure fluctuations caused by the evaporation of water, so that either the weighing process temporarily interrupted or the recycling material must be dried in order to achieve the required Asphaltmischgutgutüte. Solution: Quasistatic pressure compensation and correction of the weighing method For quasistatic pressure compensation and correction of the weighing method, pressure measuring points are arranged below and above the mineral weighing unit to dynamically record the pressure curve during the mixing and weighing process. The measured pressures are used to correct the weighing method, whereby a correction value for the weighing unit is determined at each point in time. The weighing procedure is carried out with the corrected weighing parameters. Thus, even with pressure fluctuations, the required quantities of aggregates and without interruption for the asphalt mixture will be fed exactly metered.