The requirements for the launch of the belt conveyor belt load
When the belt conveyor stops the material for some reason, it is a heavy load start when it starts. The inverter is required to re -launch the belt conveyor.
When the belt machine is carried on the tape, the torque of the motor output, that is, to overcome the resistance of the static friction between the static friction between each supporting roller and the roller shaft under the belt. The resistance caused by tension.
The resistance of the material caused by the tensile force of the material is constant. However, the static friction is much greater than the dynamic friction, which makes the initial startup torque that overcome the static friction, which is much larger than the resistance torque caused by dynamic friction during normal runtime.
Therefore, the inverter must have the function of low -speed startup torque. In the process of starting, due to the telescopicness of the belt, each roller rotates one by one in order and will not rotate at the same time. Even if the roller rotates, due to the low speed, the lubrication between the roller and the roller shaft is not good, it will be very astringent, and its dynamic friction is unstable. Therefore, the torque at low speed starts at low speed.
And throughout the startup process, it takes a certain amount of time to turn all roller wheels, and the torque starts to decline. Only by reaching a certain speed, lubrication and improvement can the fluctuation of torque decrease.
Therefore, this large low -speed startup torque needs to maintain a certain time, usually at least a few seconds. It is related to the length of the belt and the low speed at the time of start, as well as the telescope of the belt. And due to low speed, torque and speed fluctuations will be relatively large.
