A soft start system controller for two-speed scraper conveyor in coal mine

Abstract

A soft-start system controller for a two-speed scraper conveyor in a coal mine, including a microprocessor, an isolation module, a bus interface and an input-output interface, the bus interface and the input-output interface are connected to the microprocessor through the isolation module, Described microprocessor comprises MPU1, MPU2 and MPU3; Described isolation module comprises intrinsic safety isolation module and RS485 isolation module; Described intrinsic safety isolation module comprises CAN bus isolation module, RS485 bus isolation module; Set in this controller "The intrinsically safe RS485 interface and CAN interface can provide external communication capabilities in the coal mine environment, and can be directly connected to the coal mine monitoring ring network; the high speed and high "reliability" of the CAN bus interface can realize the scraper conveyor" The coordinated connection between the two devices of the "head" and "tail" achieves interconnection and interlocking, synchronous start and stop, and synchronous high and low speed switching, and realizes the "head" and "tail" two devices during soft start. power balance.

Description

technical field [0001] The invention relates to the field of mining electrical technology, in particular to a soft start system controller for a coal mine two-speed scraper conveyor. Background technique [0002] Most domestic coal mine scraper conveyors use double rollers to drag the chain structure, which requires two double-speed main motors to drive the double rollers to jointly drag the chain. Two two-speed motors must start simultaneously, stop simultaneously, switch speeds simultaneously, fail safe and fail latch simultaneously, and balance power between the two motors. Its system control consists of two main circuit gating controls, one main circuit bypass control and soft start control, as well as corresponding logic control, thyristor control, comprehensive protection and drive parts. At present, medium and small conventional PLCs are generally selected as the "system controller". During operation, the RS485 bus is used to collect data between the PLC and the two...

AI Technical Summary

Problems solved by technology

This way of working results in slow data collection and slow upload speed (both above S level), and cannot monitor the running status smoothly, which is not conducive to real-time monitoring on site, is not conducive to power balance when multiple devices are online, and is not conducive to system networking. Equipping multiple PLC communication modules will increase a lot of cost, and the coal mine requires that the external communication interface of the equipment should be "intrinsically safe". Redesigning a soft-start system controller for two-speed scraper conveyors in coal mines

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