Soft starting system controller used for coal mine double-speed scraper conveyer

Abstract

The invention discloses a soft starting system controller used for a coal mine double-speed scraper conveyer. The controller comprises a microprocessor, an isolation module, a bus interface and an input-output interface, wherein the bus interface and the input-output interface are connected with the microprocessor through the isolation module, the microprocessor comprises a MPU1, a MPU2 and a MPU3; the isolation module comprises an intrinsic safety type isolation module and a RS485 isolation module; the intrinsic safety type isolation module comprises a CAN bus isolation module and a S485 busisolation module; the controller is provided with an 'intrinsic safety type' RS485 interface and a CAN interface, can provide communication capability outwards in coal mine underground environment, and can be directly connected to a coal mine monitoring looped network; based on high speed and 'high reliability' of the CAN bus interface, coordinated linkage between two devices at a 'head' and a 'tail' of a scraper conveyor, interlinking and interlocking, synchronous starting and stopping and synchronous high speed and low speed switching are realized, moreover, power balance of the two devicesat the 'head' and the 'tail' during a soft starting period is realized.

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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