High Frequency Electric Mine Hoist Control System In The Mines - High Frequency, Electronic Control

Abstract: This paper describes the mine hoist High pressure Frequency implementation

of the system purpose, the implementation process and its key technology solutions. High-voltage inverter system with Shandong Electronic Technology Development Co., Ltd. produce beautiful high-pressure elevator Inverter . The experiments show that the electronic control system operation to achieve the desired goals, and has broad market prospects.

Keywords: winch; High frequency; Electronic Control System

0 Introduction Find home and abroad

inclined elevator speed control system of the information found mine hoist drive motors generally use the three-phase wound Motor Its speed is in the motor rotor circuit access metal resistance, paragraph by paragraph with the master controller to achieve the acceleration and deceleration cut resistance and speed purposes. Series resistance with the rotor speed of the electronic control system, which means for the braking brake, brake All the energy generated by consumption in the resistor. Series resistance rotor speed is a speed control system of speed regulation, open loop control, variable speed range of small, low-speed precision, easy to control the crawling speed, especially weight lower levels, need to string power brake and rotor resistance and brake with the operation, the driver easily control, poor safety performance. In the deceleration and the decentralization of heavy objects, the input dynamic braking, plus the DC can not only consume but also the regeneration of motor power consumption in the rotor series with the resistor, wasting a lot of power, and operation and maintenance volume, maintenance high cost. Another way to control the inverter control, but only for 660V or 380V Low Rating system.

Common frequency technology at home and abroad, four-quadrant inverter technology, PLC control technology electric winch has a very mature, and applications are very extensive. But 6000V conversion electric winch control system has not been reported and applications.

According to investigation, has not applied to our domestic coal mine elevator control system 6000V conversion electric winch. Four-quadrant inverter technology will be 6000V, PLC winch electric control technology in the underground shaft hoist on a comprehensive application and meet the "Coal Mine Safety Regulations" of the requirement to protect the sound equipment to achieve the aim must be done, and it is Inclined Shaft Winder safe, efficient and effective way to upgrade.

A key technology (1) digital circuit implementation of the safety elevator shaft explosion-proof two-shift operation.

(2) will create a series units in multi-technology home-made high voltage inverter used in the records of mine hoist.

(3) Frequency achieve inclined to enhance the braking power braking feedback.

(4) use of vector control technology, low speed high torque, starting torque purposes.

(5) PLC fully digital, network and computing functions to enhance the machine with better hardware and software protection, protect the realization of the main two-lane system.

(6) meet the requirements hoist frequent starts and stops.

(7) to meet the demands Underground 100% humidity.

2 project implementation (1) existing technology and infrastructure conditions

Blazing Kowloon mine design capacity is 1.2 million tons in the mine, the current level of exploitation of a coal seam, mining is being done to open up for the second level extension project.

Pressure transducer in the fan or pump applications are already quite mature, PLC technology and low-voltage converter in the Riser is becoming mature.

(2) field equipment in Blazing mine Kowloon Southern two winch poor environment, electric control system at a time when summer fog big underground garages and high humidity; also affected by the Mine Waste rock power, voltage fluctuation range up to 5700V-6800V, South Pei roadway severely damaged, 6KV hoist quadrant High Frequency electronic control system can adapt to this hostile environment, has withstood the test of test industry is faced with the challenge of three research staff. After three joint efforts to resolve the problems in the experiment, so that the winch operation indicators meet the design requirements, winch and reached the target.

South two vehicles operating parameters and environmental conditions

Model JK-2K Main Motor Power 240KW

Rated voltage: Three-phase AC6KV Maximum speed of 4m / s Slope length 930m The winch bear two areas of Kowloon Southern mine of materials, personnel, equipment, transportation task, the load of 15 tons in the context of irregular changes in the south slope of the second track I have seven films, winches start to stop frequently.

(3) 6KV winch Frequency Control System

6KV Frequency Control System winch main converter, console and Sensor . Are summarized as follows:

new scenery Electronics JD-BP37 high pressure to enhance Inverter

JD-BP37 upgrade Inverter High Voltage IGBT-based controller using the new piece, all-digital, color LCD touch screen control, high reliability, easy operation, high performance design goals, using advanced vector control frequency converter Hoist speed technology to complete the four-quadrant operation, for the squirrel-cage motor or wound rotor motor control of series resistance, can be used for installation of new mines can also be used to transform an old mine. Scenery upgrade high-voltage inverter, with a number of low-voltage Inverter The realization of the power unit in series high voltage output directly, raise the pressure transducer used 6kv, Transformer Group to pay 18 side winding, each phase is divided into six power unit, three-phase total of 18 units, a 36-pulse rectifier, the harmonic components of the input is far below the national standard. Upgrade high-voltage inverter system structure as Figure 1 shows.. 2 shows the circuit structure of power unit.

Figure 1 High frequency converter system structure to enhance

Figure 2 power unit circuit

Pressure to upgrade the entire electrical inverter is a core part of the control system, it has electronic control systems fit with the various interfaces. It accepts electronic control system operation commands, including opening down, rotating, and speed brake command signal, in accordance with the operation command, while it in turn to run the state, including the operating frequency, motor current, voltage, current and fault information electronic control system at any time given. Signal transducer itself and the working status of work in turn automatically records for inspection. All the input converter and output interfaces for the isolation were also introduced to avoid interference with frequency converter.

by:gaga

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