Belt conveyor is a kind of continuous conveyor, which is one of the main types of fixed or escorted cranes. The belt conveyor is a continuous conveyor equipment that uses friction to convey the dynamics, and uses belts, steel belts, steel fiber belts and chemical fiber belts as a kind of adaptability and traction operations for conveying materials and traction operations. The soft start device of the belt conveyor is operated by a PLC system to stop control, braking and stop operation. The PLC control system has the following functions:
1. The PLC can calculate the actual load at that time according to the sum of the load current of the drive motor when the belt conveyor stops each time. When starting again, PLC can be based on the size of the load, the need to use several motors when the belt conveyor starts, and select the starting closure table that is more suitable for this load, that is, the combination of the motor starting acceleration stage, so that the drive motor outputs the appropriate torque, and ensures that the conveyor starts smoothly according to the acceleration required by the plan, and the closure table can be calculated according to the formula, and can also be stored in the PLC in the form of a table.
2. The starting resistance of the drive motor is switched by the one-time protection method of the current rope ruler to ensure that the reliable start can be stopped under various load conditions.
3. The shutdown process of the belt conveyor can also be suspended, so that the shutdown characteristics can be satisfied with the planning and pleading, and the impact of the conveyor during the shutdown process can be reduced. The electrical backstop characteristics are planned on the uplink conveyor to avoid slewing and rolling when the conveyor is stopped with load. At the degree of large inertia, the belt conveyor uses DC energy consumption braking technology, cooperates with the adjustment of the rotor resistance of the motor, and controls the braking characteristics of the belt conveyor.
4. Complete the software-based drag system control. The use of PLC control and binary resistance planning makes the control of the motor starting process have a certain degree of compliance with load changes. The softwareization of many jobs can reduce the amount of debugging work, and the sensitivity of the correction work can be advanced, and the parameter correction can be convenient.
5. Next to the escort system composed of multiple belt conveyors, the PLCs of each belt conveyor are connected to each other through the communication network to form an advanced control system. The communication network completes tasks such as instruction transmission, data exchange, and operation status monitoring.
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Reliability specification: The control system should have high reliability and can be used for a long time.
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Advantage 1: Energy saving
The motor adopts frequency converter speed regulation, and its power can be improved by 5%-10%.
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1. Select the inverter according to the load characteristics
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