The closed-loop control system uses the FM 458 1DP (Process Control Module) as the core monitoring system to realize the closed-loop control and stroke process monitoring of the hoist speed loop and position loop. The main advantages are: a. The full-lift cycle position closed-loop control accuracy reaches 1cm. ; b. speed closed-loop control accuracy of 1%; c. with continuous speed monitoring, point-by-point speed monitoring, position and speed sudden monitoring and other functions; d. continuous control and monitoring of the lifting speed throughout the lifting process, to achieve / Smooth change of deceleration, reduce the impact on steel wire ropes and other mechanical equipment; e. Optimize the lifting process, automatically select different deceleration points according to the lifting speed, so that the lifting time is compressed to the shortest.
Hydraulic Brake System The constant deceleration ST3 D% disc brake provided by SIEMAG consists of a common fuel tank, valve block, electric variable pump, various sensors, 6 pairs of BE100 disc brakes and piping. Has a separate hydraulic electronic control system. The electric variable pump flow rate is 40L / m in, the working oil pressure is 14. 4M Pa, the positive pressure of each pair of disc brakes is 100kN. The pressure oil fills the accumulator, and under the action of the main working pressure, the brake spring is compressed. The specified clearance (23 mm) is achieved between the brake shoe and the brake disc. When the working pressure is reached, the pump flow is reduced to maintain the working level.
The hydraulic electronic control system consisting of two sets of S7 300 PLC and ET200 remote I/O adopts two-channel control technology to continuously monitor the components of the brake system, pressure switch, temperature control switch and disc brake. To ensure that the brake system is safe and reliable. When the brake is safe, the hoist can be safely stopped at a constant deceleration rate to reduce the impact on the drum and the wire rope. When the constant deceleration brake fails, the system can automatically switch to constant torque braking to ensure safe lifting of the hoist.
Man-machine interface and screen display The computer room monitoring computer uses Siemens W inCC software monitoring computer and also installs Siemens ProTool software for closed-loop control diagnosis, real-time monitoring of position and speed. It is also convenient to carry out position and speed protection experiments. For example, by modifying the setting parameters, the overspeed protection, the sliding rope protection, the system A / B speed mutual monitoring difference protection, the system A / B position mutual monitoring difference protection and other experiments can be performed. .
The signal system uses S7 300 PLC as the core controller, installed in the signal cabinet in the operation room, and serves as the slave station of the hoist monitoring system; each set of ET200 remote I/O is set up on the upper and lower well signal consoles. The operation room The PLC monitors and controls all the boost signals and wellhead facilities status online. At the same time, there are LED display screens in the operation room, the upper wellhead and the lower wellhead for improving the real-time display and sound of signals and various states. The main functions are as follows: All data and status can be communicated via the Profibus DP network, and the RBI and emergency stop can be contacted via hardwire.
Conclusion The two hoists were modified with numerical control technology and successfully put into use. The modified hoist has three modes of operation: manual, semi-automatic and automatic. After testing and actual operation, the hoist works normally in various modes. The numerical control system has simple structure, convenient implementation, sensitive and reliable protection actions, stable operation, meets the requirements of various operation of the hoist, and ensures the safe production of the mine. The system is virtually maintenance-free and saves a lot of maintenance money.
(Finish)
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