Cutting frequency conversion control device and control method for cantilever coal mine roadheader

Abstract

The invention discloses a cutting frequency conversion control device for a cantilever-type coal mine heading machine and a control method of the cutting frequency conversion control device. The device comprises a pre-charging and switching unit, an input reactor, a rectifier, an intermediate DC loop, an inverter, a controller and a sensor unit, wherein the output end of the pre-charging and switching unit is used for supplying power to a heading motor of the cantilever-type coal mine heading machine sequentially through the input reactor, the rectifier, the intermediate DC loop and the inverter, and the output end of the controller is connected with a controlled end of the inverter. The method comprises the following steps of: judging whether regenerative braking is required or not, generating a negative torque closed-loop control quantity by taking the voltage of the intermediate DC loop as a feedback quantity when the regenerative braking is required, and outputting the negative torque closed-loop control quantity to the inverter so as to control a motor to consume regenerative energy. The cutting frequency conversion control device and the control method thereof have the advantages that the regenerative energy can be consumed in no need of a chopper circuit, the material cost can be saved, the installation space is reduced, the cooling of an electrical cabinet of a frequency converter is improved, and convenient construction is achieved.

Description

technical field [0001] The invention relates to a cutting frequency conversion control technology of a cantilever roadheader, in particular to a cutting frequency conversion control device and a control method for a cantilever type coal mine roadheader. Background technique [0002] The cantilever roadheader is an engineering machine that integrates the functions of cutting, loading, walking, and operating. It is mainly used for cutting underground rock, coal or semi-coal roadways with any switch section. [0003] When the roadheader is actually working, the often-cut coal rock suddenly becomes soft or the operator suddenly pulls the cutting head out of the coal wall, there will be a certain moment of inertia in the mechanical system, and the load on the cutting head suddenly becomes lighter or almost Unloading, in fact, is that the load of the inverter suddenly becomes lighter or almost unloaded, causing the speed to soar, causing the inverter to frequently generate regener...

AI Technical Summary

Problems solved by technology

The inverter electric control box is an explosion-proof electrical equipment enclosure, which can withstand the internal explosion of explosive mixtures entering the enclosure through any joint surface or structural gap without damage, and will not cause external explosions caused by one or more gases or The ignition of the explosive gas environment formed by steam; because the inverter electric control box is a kind of flameproof airtight box, it is not conducive to the heat dissipation of electrical components, and the second is because the external dimensions of the inverter electric control box are affected by the cantilever Restricted by the size of the type coal mine roadheader, it is impossible to design too large, so it is not conducive to the installation of too many electrical components

However, when the system inertia is small, sometimes the braking resistor is omitted in order to save costs. When the inverter is in the regenerative braking state, the only option is to increase the ramp control time of the inverter or rely on the "dead load" of the inverter to consume regenerative energy.

However, in this way, the inverter is easy to stop working due to the problem of regenerative energy alarm, or even be damaged due to excessive regenerative energy.

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