Mine ventilating fan control system capable of automatically adjusting air quantity

Abstract

The invention provides a mine ventilating fan control system capable of automatically adjusting air quantity. The mine ventilating fan control system comprises a frequency conversion system, a programmable logic control (PLC) system and an inspection and monitoring system. The frequency conversion system comprises a power source wire leading-in device, a power source feed device and a frequency converter. The PLC system comprises a control power source wire leading-in device, a control power source feed device and a PLC device. The inspection and monitoring system comprises an operating platform, a display screen, a wind pressure transducer, a vibration transducer, a temperature transducer, and the like. A closed-loop control link is set in the PLC device, and the output frequency of the frequency converter is controlled by taking ventilating condition signals of a working face, which are acquired from the sensors or a mine local area network, as closed-loop feedback signals according to a difference between a set value and a practical sampled value, so as to automatically adjust the air quantity of mine ventilating fans. Two sets of facilities with relative independence are arranged in a speed adjusting link, the control link, an inspection link and an operating link to respectively perform control and online inspection on the two mine ventilating fans, so that the mutual switchover of the two mine ventilating fans from working to standby can be completed in a short time.

Description

technical field [0001] The invention belongs to the mine ventilator control technology, and proposes a mine ventilator control system for automatically adjusting the air volume, which is mainly used in dragging, controlling and on-line detection and monitoring of large and medium mine ventilators in mines. Background technique [0002] Mine ventilation system is one of the key equipments in the whole mine. It must run continuously 24 hours a day. Usually, two mine ventilation fans are set up, one for standby and one for use. The safety regulations stipulate that the two sets of mine ventilation fans must be completed within ten minutes. Switch or reverse wind operation. With the development of mining and excavation, the roadway is gradually extended, and the required ventilation volume needs to be continuously increased; the increase and decrease of production, the change of productivity and the change of mining methods require the adjustment of ventilation volume; the alte...

AI Technical Summary

Problems solved by technology

With the development of mining and excavation, the roadway is gradually extended, and the required ventilation volume needs to be continuously increased; the increase and decrease of production, the change of productivity and the change of mining methods require the adjustment of ventilation volume; the alternation of seasons, holidays and During the maintenance period, the change of cold and heat, the air volume should be adjusted frequently; the mine ventilation system usually selects the fan type and power according to the maximum ventilation volume required in the late mining and anti-wind conditions and considers a certain margin. The required air volume is adjusted by manually adjusting the opening of the damper and the angle of the fan blades, rather than adjusting the air volume by adjusting the speed of the fan; as we all know, the output shaft power of the fan is proportional to the cube of the speed, therefore, The main disadvantages of the traditional technology are: 1) The waste of electric energy is serious. The service life of large and medium-sized mines usually reaches several decades. The fan is often operated at high speed, which causes waste of energy and increases production costs; 2) The start-up process has a serious impact on the mechanical parts of the fan, the motor and the power grid. The traditional fan usually uses a direct start or step-down start method. The starting current is large, which is unfavorable to the insulation of the motor and is easy to burn out. During the direct start-up process, the fan produces a large mechanical vibration stress, which seriously affects the service life of the motor, fan and its mechanical components; 3) The degree of automation is low and cannot be real-time If the ventilation volume of the mining operation surface is small, it cannot meet the requirements, which may cause gas to protrude, and if it is too large, it will cause an increase in dust and affect the health of the personnel on the operation surface.

[0003] In recent years, frequency conversion speed regulation has been widely used in mine fans. According to electrical characteristics, the motor is driven by a frequency converter, and the output frequency of the frequency converter changes from zero to When the working frequency changes, the fan will start from zero speed and run stably at a certain speed. In fact, the frequency converter only plays the role of soft start, which solves the problem of starting shock. Although, it can be manually operated according to the required ventilation volume. Adjusting the output frequency of the frequency converter to adjust the air volume has made fundamental progress compared with the traditional technology. However, the current mine fan control system is usually composed of several manufacturers such as high and low voltage switch cabinets, frequency converters, control devices, and detection devices. The supply is divided into sections and the degree of integration is low, resulting in unreasonable design of the entire control system, low automation level of the whole machine equipment, and low production efficiency; the air volume adjustment is still done manually, that is, the air pressure, Wind speed, air volume, or the experience of personnel, through word of mouth, to inform the mine ventilator on duty to manually adjust the air volume, but it is still impossible to adjust the air volume of the ventilator in real time and automatically according to the actual ventilation needs of the mining operation face

Images