1. Introduction

When mining coal face, it is necessary to support and control the roof of the working face reliably, isolate the goaf and prevent the gangue from entering the working face. The emulsion pump and hydraulic support came into being under this demand, and the emulsion pump provides the power required by the hydraulic support to ensure the constant pressure of the emulsion. Some of the existing mine emulsion pump also directly enable the use of power frequency start-up and operation, power frequency start-up not only equipment easy to damage, but also high energy consumption. With the development of coal mine automation technology, the application of frequency inverter can effectively solve these problems. FGI explosion-proof inverter adopts three-level frequency conversion technology, which can not only realize the soft start and soft stop of the emulsion pump motor but also ensure the stable operation of the system.

2.Disadvantages of traditional emulsion pump applications

Traditional power frequency operation, the starting current is large, the mechanical impact is large, affecting the safe operation of the equipment;

Always running at full speed, large power consumption, resulting in a waste of power resources;

The traditional manual adjustment method has low control precision and high delay.

3.FGI solution

It adopts three-level topology structure and uses low-voltage power device to realize medium-voltage inverter output, which has high reliability.

Frequency inverter with PID control to ensure constant voltage control;

The power input terminal adopts the wide power grid design of 970V~1310V, which can meet the harsh network environment of the mine;

Direct water supply heat dissipation mode, simple process and maintenance-free;

With power frequency switching function, can achieve a drag more control;

The starting torque can reach 220% of the rated torque of the motor, realizing heavy starting and adapting to load mutations.

4. Application cases

Customer: Shanxi Huangtupo Xin Coal Industry Co., LTD

Add: Qinyuan County, Changzhi City, Shanxi Province

Model: BPJ4-500/1140

5.application performance

FGI explosion-proof inverter with PID regulation, to achieve constant voltage automatic control, energy saving effect is remarkable, energy saving 20%;

The use of FGI explosion-proof inverter can reduce the use of relief valves, reduce mechanical loss, and reduce losses by 30%;

FGI explosion-proof inverter with power conversion switching function, flexible application, low system cost;

FGI explosion-proof inverter has good overload capacity and environmental adaptability, and high operation reliability;

FGI explosion-proof inverter with over voltage, over current, lack of phase, overload, over temperature and other problems with protection function, the system protection is comprehensive.