A long cable control method for the drive system of a mining scraper conveyor

Abstract

The present invention relates to a long cable control method of a mining scraper conveyor drive system, which is characterized in that it includes the following steps: when the scraper conveyor is running, one of the component control systems is the main control system, and the main control system uses In order to control the speed of the active motor of the scraper conveyor, another component of the control system is the slave control system, which is used to control the torque of the driven motor of the scraper conveyor, and the general control system samples the sub-control system of the scraper conveyor The data is analyzed, and according to the sampling data, the operating conditions of each control system are controlled and adjusted to achieve real-time monitoring, real-time adjustment, and automatic adjustment of intelligent operation. The advantages of the invention are: the circuit structure of the invention is simple, the cost is low, the control is easy and the cost performance is high, and various special working conditions of the driving system of the scraper conveyor can be realized more effectively, and the regenerative energy can be effectively utilized.

Description

technical field [0001] The invention relates to a long cable control method of a mining scraper conveyor driving system. Background technique [0002] With the increase of mine production, the depth of mining is increasing and the cost of transportation is rising. At the same time, the traditional automobile transportation will produce a large amount of automobile exhaust, which seriously pollutes the underground environment. On the one hand, the use of tape transportation system can save a lot of transportation costs, on the other hand, it can reduce the emission of automobile exhaust and improve the environment of underground operations. Correspondingly, mine transporters have also been developed. [0003] The types of conveyors include belt conveyors, plate conveyors, trolley conveyors, scraper conveyors and other conveyors. With the development and utilization of motor production technology in coal mining, the efficiency of coal mining has been greatly improved. Compar...

AI Technical Summary

Problems solved by technology

Since the output of the inverter is PWM wave and the long cable is used for power supply, the outstanding problems are: first, the harmonic reflection

At the same time, due to the existence of harmonics, when the inverter is powered by a long cable, the supply voltage and current are unstable, and the working conditions of the load cannot be effectively controlled.

Second, the inverter pulse reflection

However, there are many problems in this design method: (1) When there is a lot of raw coal on the scraper machine, the starting power torque becomes larger, requiring manual removal, and the efficiency is not high; (2) There is cable loss, and the mine working roadway is relatively long, requiring a long cables, resulting in a large tube voltage drop, insufficient starting voltage and operating voltage

(3) It is difficult to achieve synchronous control, which is not conducive to the actual production needs

(4) It will lead to waste of electric energy when no-load

(5) The belt is unevenly stressed, prone to slipping and other phenomena, and damages the motor of the conveyor

(1) The motor still cannot achieve synchronous control, which is easy to damage the scraper conveyor

(2) When there is a lot of raw coal on the transport plane, a power supply with more than 2.5 times the rated power of the motor is required for heavy-duty startup, which will cause the instability of the entire power grid and affect other operations

(3) It is easy to cause waste of electric energy when braking or idling

(4) The problem that the motor cannot start normally caused by uneven force is still not solved

(5) Long-distance control cannot be achieved, and short-distance control is still required, which is prone to safety accidents

(6) The electromagnetic interference of the two-level inverter governor is large, which affects the power grid

(7) The length of the connecting line between the scraper conveyor and the inverter varies from several hundred meters to several kilometers, which is not conducive to the inverter supplying power to the long cable of the scraper conveyor, and it is easy to generate overvoltage, launch waves, and damage the motor and cable

(8) When the power supply grid fluctuates, the output is unstable, which is likely to cause unnecessary failures

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