Electric Control System of Mine Hoist

Product Description

ZTK Mine lifting electrical control system

System introduction

ZTK mining hoisting electric control system is based on BPJ1 mine explosion-proof and intrinsically safe AC frequency converter. It is applied to the application of lifting and transportation of underground inclined lane winch and stepless rope winch, and synchronously developed programmable controller and field sensor. It constitutes an electronic control system integrating drag, control, operation and on-site detection, forming a set of drive to exchange inverters and controlling the electronic control system with the programmable controller as the core (hereinafter referred to as the electronic control device).





The electric control device realizes the control of the main circuit of the motor by the mine explosion-proof and intrinsically safe inverter, and operates the display unit, programmable controller (PLC), counting encoder, position switch and other field operation commands, information feedback, logic operation. The process program is applied to the inverter closed-loop regulation system to control the high-power IGBT components. During the start, run and stop of the motor, the motor is automatically controlled according to the preset preset curve, and the acceleration time, acceleration and speed control are guaranteed. Within the set range, it makes the running process smooth and reliable. During electric braking, the motor works in the power generation state, so that the DC bus voltage of the device is higher than the set value, and the device feeds back energy to the grid.

The electric control device is mainly used in transportation systems such as coal mine main, Fujing hoist, dark inclined shaft hoist winch and endless rope winch. Its characteristics of high speed regulation, large torque, complete protection, safety and reliability, energy saving and high efficiency are obtained. Widely recognized and widely applied.

Adopting advanced industrial computer, programmable controller, intelligent instrument, data communication technology and various intelligent sensors, the distributed automatic control system is composed of centralized control and decentralized control. The control system consists of four layers: management layer, operation layer, control layer and field equipment. The management and operation layer adopt the technologies of dual thermal standby and dual communication redundancy, and adopt the communication modes of equipment network, industrial redundant Ethernet, local area network and Modbus485 network to form the network structure of integrated management and control. Management upward and enterprise management station to form a high-speed LAN, for managers to provide decision-making information.

System composition

• BPJ series mine explosion-proof and intrinsically safe AC inverter
• Mine intrinsically safe pressure transmitter
• Mine intrinsically safe temperature sensor
• Mine intrinsically safe proximity switch
• Mine intrinsically safe travel switch
• Mine shaft encoder
• Mine intrinsically safe console
• Mine explosion-proof and intrinsically safe programmable control box

System functions

• The system has semi-automatic, manual, overhaul and other control methods.The system has over-wind bypass selection, safety loop control, fault signal shielding
• The lifting height is corrected according to the actual position of the mine car to ensure the parking accuracy.
• Frequency settings: digital settings, analog settings, Modbus or PROFIBUS communication settings, etc.
• Protection function: over voltage, under voltage, over current, overload, zero sequence current (leakage), input and output phase loss, motor overspeed, over temperature, IGBT short circuit, motor short circuit, hardware fault, software fault, etc.
• Fault memory function: automatically saves various information and waveform information of the last nine faults, which is convenient for analyzing the cause of the fault.
• System protection: over-winding, over-speed of hoist, limit protection, over-load and under-voltage, failure of depth indicator, gate clearance protection device, loose rope protection, wrong operation direction, emergency stop of operation platform, emergency stop of signal system, transducer fault, hydraulic station fault, main motor temperature alarm, main bearing temperature alarm, brake oil temperature, mine car off-track protection, encoder failure protection, etc.

System characteristics

• Adopting advanced speed sensorless vector control technology, the double closed loop (speed loop, current loop) adjustment control technology in DC motor control is applied to the control of AC three-phase motor through a series of vector transformations, which makes the system speed regulation precision high. Good speed regulation and good mechanical properties.
• Using AFE rectifier feedback technology, electric braking with regenerative energy feedback is realized, which has large braking moment and good response characteristics.
• Meet or exceed the protection requirements stipulated in "Coal Safety Regulations"
• It constitutes the safety protection of two-wire system (two sets of PLCs), and key circuits such as safety circuits and deceleration circuits are designed with redundancy and redundancy in hardware and software to achieve double or triple protection.
• The "two-wire system" control of the winch electronic control system is realized, which ensures the reliable emergency operation of the equipment under fault conditions.
• The driver's operation is simple and reliable, and the safety and reliability of the system are no longer determined by the driver, but determined by the device itself, which improves the safety and reliability of the system.
• The system design is designed and reviewed according to the principles of safety, reliability, advanced technology, convenient use and maintenance, and economy and practicality.
• Explosion-proof inverter drive, good energy saving effect.
• Realize the locking of the safety facilities of the inclined lane.
• It can meet the requirements of torque and control of endless rope winch under various working conditions.
• Basic maintenance-free, reducing equipment downtime due to maintenance.