A company in Hangzhou is committed to researching the front-end technology of terminal loading and unloading equipment, and the screw coal unloader is one of them. The shearer in the early stage is an AC asynchronous motor, and the cooling is completed by the tail cooling fan, but the asynchronous motor is affected by external factors such as large volume, low power density, poor heat dissipation environment, and poor protection compared with synchronous motor, and the energy consumption is high, the operating power is low, and the dust flies in the process of operation, which has great pollution to the environment.
According to the technical requirements of the screw unloader, in order to adapt to the load characteristics, the inverter needs to have similar functional characteristics of the "excavator", that is, when the load is too large and exceeds the set limit value, the frequency conversion passes the current limit and adheres to the current situation, and gives an overload warning together, which is similar to the overload pressure relief condition of the excavator; When the load drops to the promised range, it will continue to operate after recovering to the working condition before the current limiting.
Based on this problem, INVT launched the GD350-19 system solution plan, and the product features are as follows:
1. With energy feedback, the excess energy of operation can be fed back to the power grid;
2. With multi-pole synchronous motor and design exclusive "excavator" function;
3. Support resolver encoder to complete closed-loop control;
The inverter is planned to have high loading and unloading power and is environmentally friendly, reducing resistance, braking units, etc. compared to traditional plans.
Customer value
Efficient: Design exclusive "excavator" function to improve unloading capacity.
Energy saving: The system has the function of energy feedback to improve the energy utilization power of the whole system;
Environmental protection: the use of resolver encoder to complete closed-loop control can reduce dust pollution and reduce the overflow of dust and materials;
Cost: Energy saving and work reliability reduce the cost of long-term operation of the ship unloader, and save labor costs by reducing labor.
Noise: The equipment runs smoothly and reliably, and will not cause noise pollution to the surrounding environment;
Function: With Profinet communication function, various conditions are summarized to the DCS front-end in real time, which is convenient for data acquisition and control of the upper computer;
Screw coal unloader is a kind of coal unloading machinery used in docks or thermal power plants. The application of INVT GD350-19 on this equipment has the advantages of excellent function, convenient maintenance and operation, especially the exclusive "excavator" function, which ensures the working power of unloading and improves the overall economic benefits.
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