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 Frequency conversion electric control of mine hoist合肥附近有没有服务

Frequency conversion electric control of mine hoist

Product introduction: Electrical system: there are a variety of control systems for users to choose from. 1) General type: select the components purchased by the electrical manufacturer and fixed point. After screening, the components are characterized by low price and convenient maintenance. 2) PLC type: it is characterized by digital control, so

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Introduction of frequency conversion electric control of mine hoist

Electrical system: there are a variety of control systems for users to choose from.
 
1) common type: select the components purchased by the manufacturer and fixed point. After screening, the components are characterized by low price and convenient maintenance.
 
2) PLC type: it is characterized by digital control and low failure rate.
 
3) frequency conversion type: it is the control mode of energy saving so far.
 
4) in the control system, according to the coal safety regulations, multiple functions such as over speed, over winding, overload, under voltage, oil temperature, speed limit, brake shoe clearance and rope loosening are set.
 
5) frequency conversion PLC electrical equipment
 
General:
 
The AC electric control system equipment meets the provisions and basic requirements of the following documents:
 
1. Coal mine regulations (2010 Edition).
 
2. Code for metal and nonmetal underground mines (GB 16424-1996).
 
3. Code for design of mine electric power (GB 50070-94).
 
4. Code for design of low voltage distribution (GB 50054-95)
 
5. (89) various protection and backup protection functions specified in the document of China Coal general life.
 
6. Electromagnetic compatibility of industrial process measurement and control devices (GB / t13926-92)
 
7. Jb4263-86 technical conditions for electromechanical control equipment of AC drive mine hoist
 
8. The current standards of the electrical commission of China
 
9. The electrical equipment shall comply with the IEC standard of * * Electrotechnical Commission
 
10. The electromagnetic compatibility of electric control device conforms to the basic measurement method of industrial radio interference (gb3907-83) and the basic measurement method of anti-interference characteristics of electrical equipment (gb4859-84)
 
Basic parameters
 
Main loop control mode: full digital frequency conversion speed regulation, capacity selection enough margin.
 
Control loop mode: PLC programmable controller.
 
1) type of control equipment: new type of electric control system, full digital frequency conversion speed regulation, Siemens S7-PLC control, the control principle meets the requirements of upgrading process, and has more perfect software and hardware protection links, and each main protection realizes double protection. According to the signal direction, the electronic control system can accelerate manually or semi-automatically, decelerate automatically and stop automatically.
 
Features:
 
(1) stepless speed regulation, stable and continuously adjustable speed;
 
Compared with the traditional form of series and rotor, the energy-saving form of series and rotor is remarkable;
 
Technology represents the development direction of AC electric control of hoist;
 
It has entered the stage of mature technology and popularization
 
(5) no noise and small floor area;
 
2) the lifting operation system meets the requirements of manual, semi-automatic and automatic.
 
3) the operating handle adopts a new master switch, which is flexible and reliable.
 
3.4.1 low voltage power supply cabinet and frequency conversion control cabinet
 
The double circuit power supply incoming line has the corresponding control, measurement and protection functions; the double circuit power supply incoming line adopts the working mode of one for use and one for standby.
 
Provide 0.22/0.38kv three-phase power supply for auxiliary equipment (hydraulic station, lubrication station, etc.) of electric control system. Switch and other protection, control, measurement and signal components are selected for the feed out circuit.
 
UPS is installed in the cabinet to supply power to the control equipment and PLC to ensure reliable braking and data retention of the hoist after the low-voltage power failure.
 
Provide over-current protection of incoming power supply and voltage and current detection of incoming power supply;
 
      Weikang frequency converter is used as digital speed control device to realize stepless speed regulation and stable speed operation; a large number of rotor resistance is cancelled, which significantly reduces energy consumption and operation cost; it also reduces land occupation; it has strong anti-interference ability and strong environmental protection; it has small harmonic component and no pollution to the power grid; vector control technology of frequency conversion is adopted to keep the actual speed in line with the preset speed Speed change, the smooth transition of speed diagram from constant speed section to deceleration section and deceleration section to crawling section is good, and it has better speed regulation performance than DC driven hoist; it has good locked rotor characteristic, and the locked rotor current can be set at will, and the actual current value will not exceed the set value; the digital frequency conversion power supply device of mine hoist operates according to the "s" type given curve, It makes the change rate of acceleration DA / dt smaller or constant, and the impact on the mechanical system is smaller in the process of starting and stopping. For the hoist of auxiliary shaft hoisting, the personnel feel comfortable; through the man-machine dialogue interface, it is convenient to use and debug, and has less parameters set according to different use occasions; it has powerful internal software fault diagnosis function and external line fault diagnosis function When the fault is diagnosed, the device will stop working automatically to prevent the further expansion of the fault, and give an accurate fault alarm at the same time; the computer full digital control has the advantages of convenient debugging, stable performance and high reliability.
 
3.4.2 PLC control console
 
PLC S7 - is used to realize the control of lifting process, mutual monitoring, protection and mutual redundancy. The PLC control system is composed of di / do, AI / AO, high-speed counting, communication, etc., and has a margin of * *.
 
Functions:
 
The circuit is realized by PLC and relay redundancy;
 
Full stroke speed monitoring: the actual speed exceeds 8 pre alarm of the given speed, the constant speed section exceeds 15% of the given speed, and the deceleration section exceeds 10% of the given speed;
 
Over rolling 0.5 m realizes braking;
 
Brake shoe wear and spring fatigue protection;
 
Software and hardware locking with signal system;
 
PLC software integrated fault protection.
 
It has the following protection:
 
Main circuit over-current, over-voltage and under voltage protection;
 
Inverter input and output phase loss protection;
 
Shaft break protection of depth indicator;
 
Backup protection of deceleration point;
 
2 m / s speed limit protection at wellhead;
 
Wrong direction protection;
 
Secondary brake release protection;
 
Overspeed protection in constant speed section and deceleration section;
 
Interlocking protection of start-up and operation signals;
 
Driving direction self-locking and automatic reversing function;
 
The loop is realized in series with internal and external AC circuits of PLC;
 
The operating platform is equipped with indicator light, instrument, selector switch, button and audio equipment, which can meet the requirements of various control processes for hoist operation.
 
The main contents of the instrument are: lifting speed, motor voltage, motor current, brake oil pressure, adjustable brake current, etc.
 
The contents of indicator light include: hoist operation status indication, signal indication and status indication.
 
The selection switch and button include: operation mode selection switch, overwinding reset switch, self-locking emergency brake button, semi-automatic start-up button, etc.
 
3.4.3 frequency conversion brake cabinet
 
The frequency conversion brake cabinet is equipped with braking unit and braking resistance which are suitable for the frequency converter, and cooperate with the work of frequency conversion system to meet the requirements of deceleration operation. In the case of negative force, the lifting process consumes part of the energy on the braking resistance.
 
3.4.4 axis encoder
 
According to the requirements of control function, the control and protection are completed by shaft encoder tachogenerator.
 
The encoder pulse and tachometer signal are sent to PLC respectively for independent measurement, calculation, comparison and control and protection.
 
According to the pulse generated by the shaft encoder, the position of the lifting container is displayed on the touch screen through PLC calculation, and it participates in the stroke control.
 
3.4.5 touch screen
 
The touch screen is installed on the console and communicates with the main PLC through cable. In the actual operation process, the touch screen monitors the dynamic and static parameters of the hoist operation process and the equipment that may endanger the normal operation of the hoist, so as to realize the full Chinese character interface, diagnose and save the light and heavy faults of the hoist system, realize the comprehensive backup protection function, and display and print the location, time, cause and fault of the fault It can display and record the real-time value of depth, speed, lifting type and signal condition in real time.
 
It can display the main equipment technical parameters, display the lifting cycle speed diagram and fault occurrence, and display the action of PLC interfaces, which is convenient for line maintenance.
 
The specific pictures include:
 
Simulation of each channel
 
Monitor the working status of the sensors (including PLC)
 
Position indication of lifting container (including running direction, speed, in place, overwinding, opening times, etc.)
 
Service commitment:
 
One set of manual (Chinese) of control module, software manual, etc. shall be provided.
 
After the equipment is put into operation, in case of failure. Our service personnel will arrive at the scene within 48 hours.

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