Variable frequency speed regulation safety control device for mining industry

Abstract

The invention relates to a variable frequency speed regulation safety control device for mining industry. The device comprises a frequency converter, a control device and an explosion-proof box, wherein the frequency converter consists of a three-phase rectifier, a filter capacitor and an IGBT (Insulated Gate Bipolar Transistor) inverter; and the control device comprises an isolating switch, a power frequency and secondary control loop and a frequency conversion and control loop. The device has two working modes, namely a variable frequency working mode and a power frequency working mode; priority is given to the variable frequency working mode which is supplemented by the power frequency working mode; better speed regulation and energy conservation can be realized; the device has the advantages of dust proofing, moisture proofing, explosion proofing and the like; digital display is adopted by the variable frequency speed regulation device; and the device has remote and near control functions, has electric energy display, namely clearly display electric energy of the load, and has a temperature control function and protection functions of overload protection, open phase protection, over-voltage protection, under-voltage protection and the like. The device can be used for occasions with coal dust or gas coal dust explosion in coal mines, is used for controlling start, stop, variable frequency speed regulation and the like of a three-phase explosion-proof motor and can be used for performing various protections on the motor.

Description

technical field [0001] The invention relates to a motor frequency conversion control technology, more specifically to a mining explosion-proof and intrinsically safe frequency conversion speed regulating device. Background technique [0002] In the prior art, motor frequency conversion control technology is rapidly and widely used in industrial production fields, such as machinery, household appliances, metallurgy, light textile and other industries. It can regulate speed very well and has obvious energy-saving functions. But its disadvantage is that due to the use of high-power power semiconductors as rectifier and inverter components, its heat dissipation problem has always hindered the use of frequency conversion technology in flammable and explosive environments such as mines, and in mining such as belt conveyors, hoisting winches, fans, scrapers Transport aircraft and others require full torque starting, variable load operation, and soft start and soft stop, all of whic...

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Problems solved by technology

But its disadvantage is that due to the use of high-power power semiconductors as rectifier and inverter components, its heat dissipation problem has always hindered the use of frequency conversion technology in flammable and explosive environments such as mines, and in mining such as belt conveyors, hoisting winches, fans, scrapers Transport aircrafts require full torque start, variable load operation, soft start and soft stop, and frequency conversion technology is required, but general-purpose frequency converters cannot meet the requirements of flammable and explosive environments.

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