The detailed technical flow is as follows:
First of all, Fill various specifications of cold aggregates in the hopper with the loading machine for primary selecting, at the same time sieve out the unused cold aggregates ( bigger than 40mm or self-decided), finally delivery the qualified cold aggregates to the dry roller by the gradient belt feeder.
The aggregates are heated, dried and mixed in roller fully through the burning system; In the course of drying, the dusts and moisture in the cold aggregates are inhaled in the dust catcher, the dusts are separated out from the dust catcher, a few big grain dusts flow into the hot aggregate elevator automatically through one-grade dust catcher and continue to use; Most slight dust are removed by the water dust remover and flow into the sedimentary pool.
The heated hot aggregates in dry roller will flow into the elevator, then will be sent to the closed round vibration sifter on the mixing plant by elevator, the vibration sifter will divided them into five kinds ( four kinds are qualified materials and one is scrap), then enter into the corresponding hot aggregate storage below the sifter separately. Moreover according to the deferent proportion of aggregates, put every kinds of hot aggregates into the measuring hopper in turn, there are three pull transducers on the top of hopper, the transducers will send the weight sign to the switchboard system, and then weigh up in turn in the aggregate measuring hopper controlled by PLC; The computer controls the start order and time of every storehouse gates and air cylinders, as well as the placement of the measuring hopper.
On the other hand, the new ore powder is added into the feeding inlet of the ore powder elevator by manual, they will be sent into the interim storage by the elevator hopper, then throw in the measuring hopper; there are three pull transducers on the top of measuring hopper, the transducers will send the weight sign to the switchboard system, PLC will control the start and close of air butterfly valve for realizing the placement of ore powder.
Meanwhile, the bitumen is heated in the high-temperature bitumen pot, heat it to about 150°C; Three-way spiral valve is in the position of circulation at the same time, the bitumen begin to circulate. Electric air three-way valve not only can make the bitumen circulate but also can send them to the measuring pot; there are also three pull transducers on the top of measuring pot, the transducers will send the weight sign to the switchboard system, PLC will control the weight of bitumen according to the needed bitumen-aggregate ratio.
Finally, put the weighed aggregates, ore powder and bitumen into the mixer to mix. PLC will control the start order and mixing time of every cylinder, it is divided into three control methods of full-automatic, semi-automatic and manual. When it is up to the stipulated time (general 45 seconds), open the discharging gate of mixer, put the even mixture into the carriage and finish the output