Trough chain conveyor are widely used in underground work of coal mines, with compact structure, convenient installation and disassembling, high fuselage strength, strong adaptability to environmental temperature, humidity, dust and roadway slope, which can realize continuous coal transportation. Trough chain conveyor can realize the coal transport by the movement of chain and need to overcome the friction between trough and chain in the operation process, and which has large fluctuation of load with impulse load. When the equipment starts and stops, the load is large, if the control is not appropriate, it will cause the excessive current of the trough chain conveyor, which will affect the service life of the trough chain conveyor. Therefore, using a reasonable control method to optimize the operating parameters of the trough chain conveyor is an effective way to improve the operation efficiency and service life of the trough chain conveyor.
Trough chain conveyor belongs to the conveying equipment in coal mines, the falling amount and falling position of coal during the operation are variable, and the phenomenon of overload operation may occur due to local stuck hysteresis. If the power is cut off suddenly, the coal seam of the trough chain conveyor is not completely unloaded, so a large load is required when it is started again. In addition, the current motor on the trough chain conveyor is a double speed motor, which can be started by setting the combined switch to realize the start control, so that the trough chain conveyor can start at a low speed and enter a high speed state after stable operation. This kind of control mode not only can't realize the speed control, but also exists the high speed state no-load or light load operation, wastes the electric energy.
In the use of intelligent frequency conversion device of trough chain conveyor, which is an innovation of the traditional mode of double speed motor drive and the implementation of the trough chain conveyor speed and torque of the precise adjustment, greatly reduce the energy consumption in the process of operation, greatly improve the performance of the trough chain conveyor. These are mainly manifested in the following respects.

Intelligent control running speed
The conveying quantity of coal fluctuates periodically during the operation of trough chain conveyor. The use of intelligent frequency conversion device is beneficial to control the ideal coordination between the transport load and the running speed. When the conveying quantity in a stage is small, the intelligent frequency conversion device controls the motor to run at a lower speed, effectively increasing the bearing capacity per unit length, reducing the consumption of electricity, and avoiding the extra wear of moving parts such as the trough chain chain. When the conveying quantity becomes larger, in order to ensure the coal transportation efficiency, the system controls the motor to run at a higher speed within the range of power transportation to ensure the coal transportation efficiency.
Power balance of multiple motors
For a trough chain conveyor with two motors, the motor speed fluctuates periodically due to the influence of processing accuracy and rotor resistance of each motor. Different motor speed will directly affect the output power of the motor and the size of the drive current. The intelligent frequency conversion device can monitor the running load of the motor in real time, control the speed or torque balance of the motor at the head and tail in real time, improve the coordinated operation efficiency of the motor, and maintain the stability of the power grid current.
Overloading starting
For the suddenly caused power failure or emergency stop, because full load of fuselage and static friction resistance, trough chain conveyor starts again need large torque,intelligent frequency conversion device can fast and accurate control of the motor starting torque is less than 1.5 times the rated torque, starting current is less than 2 times of the rated current, to avoid overloading the start current impact on power grid and load impact of blowing machine drive system.
Reducing the impact of overload running
In the operation of trough chain conveyor, there may be situations such as blocked rotation and load surge, resulting in overload operation conditions. The circuit components of intelligent frequency conversion device have good voltage resistance performance, which can effectively reduce the impact of overload conditions on the conveyor motor.
In the use of intelligent frequency conversion device of trough chain conveyor, which greatly improve the running speed of the trough chain conveyor and the torque control effect in the operation process, effectively reduce the influence of trough chain conveyor for grid in the process of start and the impact on trough chain conveyor mechanical system at the same time, reduce energy consumption in the operation process of trough chain conveyor, make the trough chain conveyor has a stronger ability to adapt the operation condition and long service life.