The characteristics and working environment of the mine stainless steel conveyor structure

stainless steel conveyor

Structure characteristics and working environment:

stainless steel conveyor

From the perspective of load characteristics, it belongs to the type of constant torque load, but it is different from ordinary constant torque load, which is caused by the difference in its own structure and the working environment in which it is located. variable frequency drive is very important. The scraper loading conveyor needs a large torque when starting, and it runs at a low speed, and its response sensitivity to torque is very high, so the control technology of the variable frequency drive of the scraper loading conveyor adopts direct torque Control Technology.

The essence of direct torque control technology is to regard the motor and the inverter as one, so as to realize the unity of the motor's operating performance and the control mode of the inverter. Specifically, when the symmetrical three-phase sinusoidal voltage is applied to the asynchronous motor and acts on When the motor has a symmetrical three-phase stator winding, a magnetic flux with a constant rotation speed and a constant amplitude will be generated in the air gap of the motor. The motor runs under the stator flux linkage and is in an ideal operating state. At this time, the input three The phase sinusoidal voltage controls the stator flux linkage and affects the operation of the motor. The three-phase inverter outputs voltage to the motor, and the quality of the input voltage is determined by the switching mode of the power electronic devices used in the three-phase inverter, so the quality of the input voltage determines the operating performance of the motor. Therefore, establishing the relationship between the flux linkage and the switching mode of the inverter, and selecting the appropriate switching mode of the inverter can make the motor obtain an approximately circular magnetic field, and the motor can run ideally.

Direct torque control theory has many advantages, such as simple calculation, good parameter robustness, fast dynamic response and relatively simple control structure. However, there are also many imperfections, mainly in the fact that the torque pulse is large at low speed, and the switching devices of the upper and lower bridge arms of the same phase of the inverter are simultaneously turned on, causing a short circuit of the DC side power supply, resulting in a large interlock delay. , and produces a dead zone effect, and the accumulated error of the dead zone effect distorts the output voltage of the inverter, which in turn leads to current distortion and aggravates the problems of pulse and system instability.

The use and installation of gravity roller conveyor is compared with most other systems for managing the container loading machine effectively and no doubt flexible conveyor system have won the race so many times.

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