Application of FGI explosion-proof four-quadrant frequency inverter in belt conveyor

1.Introduction

Belt conveyor is an important machine in mining and transportation. According to the geological condition of the mine, it can be operated in three ways: roadway, upward and downward.

In the process of operation, due to the gravity component of the material and the tape itself, the belt machine can convert the mechanical energy when going down into electrical energy and feed back to the drag motor and transmission device. If this part of the energy can be recovered to the power grid for use, it is of great significance for the energy saving and emission reduction of the mine. Therefore, the use of FGI explosion-proof four-quadrant inverter on the tape machine can effectively improve its performance.

In the process of variable frequency speed regulation of the downward belt conveyor, it is necessary to consider both the power balance between multiple motors and the energy feedback when the conveyor belt is going down, so the frequency conversion transmission of the downward belt conveyor is more complex than that of the down-channeling belt conveyor and the upward belt conveyor.

2.Problems in the use of conventional belt conveyor

Conventional belt conveyor works at power frequency, because of its long time power frequency operation and the efficiency of the hydraulic coupling, it is very uneconomical in the work.

Because the motor can not use soft start and soft stop, it causes a strong impact on the machine and speeds up the wear of the machine.

Belt, hydraulic coupler wear and maintenance problems will bring a large amount of costs to the enterprise.

The way of downward conveyor belt can not realize the feedback of energy, which leads to the waste of power.

3.FGI explosion-proof four-quadrant frequency inverter

FGI explosion-proof four-image inverter rectifier and inverter adopt three-level topology, the use of low-voltage power devices to achieve medium-voltage inverter output, high reliability.

Power factor up to 1, to achieve green frequency conversion.

FGI explosion-proof four-image inverter adopts 485 and CAN communication to achieve master-slave control.

The power input of FGI explosion-proof four-image inverter adopts a wide power grid design of 970V~1310V, which can meet the harsh power grid environment of the mine.

Direct water supply heat dissipation, the process is simple and maintenance-free.

4.FGI explosion-proof four-quadrant inverter performance

FGI explosion-proof four-quadrant inverter realizes speed regulation and current sharing. The torque output from the slave engine is the same as that from the main engine. The interface shows that the difference between the two currents is less than 1%. The slave machine will not produce overvoltage or overcurrent that does not match the speed of the main machine.

FGI explosion-proof four-quadrant inverter has excellent soft start/close performance. Acceleration/deceleration time can be continuously adjusted (0~60 minutes), with S-shaped up/down function, can effectively reduce the start and stop vibration.

FGI explosion-proof four-quadrant inverter, heavy load start smoothly. The belt conveyor can work normally at any time when transporting coal, and can play 2 times the rated torque at low speed.

FGI explosion-proof four-quadrant inverter uses PWM rectification technology to convert the recovered energy of the motor into electrical energy and feed it back to the grid, making its power factor as high as 0.98 and maximizing energy saving.