4000 type hot mix asphalt plant with Auto ignition Burner and interlock protection function
1. Introduction of electric control system
A. Summarization
The electric controlling system of QLB series asphalt plant has an independent center control house and peripheral equipments such as wires and cables, and the control house contains Centralized control room and switch room. The system, containing upper computer unit and the lower programmable controller (PLC) etc, constitutes a distributed computer control system. Each unit communicates with others through standard string of RS232.The system can complete the state-control of each work automatically, namely automatic switch, automatic rationing, compensation for overweighing, fault alarm, report forms storage and print etc, and these are all the control functions needed. Now, the asphalt plants of our company have deluxe software system used for control and surveillance, and the design principle and level of the system is on the foreland of this industry.
B. System Characteristics
. Realize user-friendly interface and powerful function of man-plant interaction.
. For each system or part, Real-time indication of working condtion.
. Particular automatic batching and dosing function of cold aggregate filling.
. Precise temp-control method of PID.
. Unique automatic compensation and auto tracking for base material weihing.
. Effective management of parameter and produciton data.
. Realize management of base material use.
. Strong function of failure monitoring and reminding.
. Realize auto runing for all systems of mixing plant.
. Powerful Production data query function, which is for recording and printing required datas.
. Remote diagnosing&servicing function through Internet.
Specification
| No. | Name | Quantity | Remark |
| A | Supply System Of Cold Aggregate Powder | ||
| 1 | 16m3Integrated type Cold Aggregate Powder Hopper (two with wall vibrator) | 6 sets | with empty hopper alarm device |
| 2 | Skirt Strap Feeder | 6 sets | frequency converter |
| 3 | Collective Belt Conveyer | 1 set | |
| 4 | Slope belt conveyer | 1 set | |
| B | Dryer and burner for aggregate | ||
| 1 | Dryer | 1 set | Stainless steel cover outside for heat preservation |
| 2 | Progressive lubrication system | 2sets | YOKE |
| 3 | Burner(Heavy,residual oil) | 1 set | DIGI BURNER ZZR4000 |
| 4 | 50T diesel tank | 1pc | |
| C | Hot Material Hoist | ||
| 1 | Stone Material Hoist | 1 set | |
| D | Mixing tower system | ||
| 1 | Twin-shaft | 1 set | technology, NSK bearing |
| 2 | Hot aggregate bin(6 bins) | 1 set | Color steel cover for heat preservation, continuous position indicator |
| 3 | Stone material metering | 1 set | Toledo sensor |
| 4 | Fine material metering | 1 set | Toledo sensor |
| 5 | Asphalt metering | 1 set | Toledo sensor |
| 6 | Asphalt metering spraying pump | 1 set | |
| 7 | Fine material screw conveyor | 1 set | Italy WAM |
| 8 | Mixing tank | 1 set | |
| 9 | Progressive lubrication system | 1 set | YOKE |
| 10 | Main Frame Equipped With Platform, Ladder, Handrail And Guard Railing | 1 set | Container type , Closed housing |
| E | Mineral and waste powder storage and conveying system | ||
| 1 | Mineral powder storage bin(75m3) | 1set | With WAM arc-breaker and overflow acousto-optic alarm |
| 2 | Reclaimed powder storage bin(50m3) | 1set | With arc-breaker |
| 3 | Waste powder hoister | 1set | |
| 4 | Screw conveyor | 3sets | Convey waste powder to hoister |
| 5 | Screw conveyor | 2sets | Fine material metering,Italy WAM |
| 6 | Screw conveyor | 1set | Waste powder discharging |
| 7 | Butterfly valve | 3sets | Italy WAM |
| F | Dust Collector System | ||
| 1 | Primary volute casing collector | 1set | |
| 2 | Screw conveyor | 1set | To hot aggregate hoister |
| 3 | Secondary Bag Collector(air back flush ) | 1set | Nomex bag, air back flushing |
| 4 | Draught Fan, Smoke Path and Chimney | 1set | ABB soft starter |
| 5 | Air door electric actuator | 1set | |
| G | Pneumatic Control S
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