1. Main Standards
GB5144-94: Safety regulations of Tower Crane
GB/T13752-92: Design Specifications of Tower Crane
GB/T9462-1999: Technical Specifications of Tower Crane
GB/T5031-94: Performance Test of Tower Crane
GB/T17806-1999: Methods of Reliability Testing of Tower Crane
GB/T17807-1999: Methods of Structure Testing of Tower Crane
JG/T5037-93: Classification of Tower Crane
2. The resume of "mingwei" Tower Crane feature
"mingwei" has twenty-years-designing experience of tower crane, is the leadership and the president organization of Tower Crane Technology Association, transferred the technology of tower crane to 80% companies which manufacture tower crane in China, many times organized and undertook national projects which need be tackled key problem, and has been compiling national standards or trade technology standards of tower crane. Because of getting together the classic experts of tower crane, "minglong" is the authority technology center of tower crane in China.
"mingwei" has been manufacturing tower crane since 1956. Many years hard working, "minglong" has manufactured series products: 5013, 5015, 5613, 5616, 5023, 5518, 6013, 6020, 6517, 7030, 7035, 7052 which performance specifications are in line with the market demands. The sale of large and medium size tower cranes is the primacy in China in the past years.
3. Electrical control system
Adopting PLC in electrical control system to improve reliability and safety. Using PLC (programmable logic controller) as the main control unit, it is very useful to reduce the quantity of logic control components, decrease the failure rate of the control system, and improve the reliability. The system controls the three mechanisms (Hoisting mechanism, Slewing mechanism and Trolleying mechanism) together, collects all the safety-limit signals, and deals with those signals in complicated logic, it is very efficient to optimize the mechanisms motion and avoid false operation. The system can self-diagnose electric faults and give corresponding alarms with different sounds and lights.
The main electric elements are used world-renowned products, it is the key of high reliability of "mingwei" tower crane, such as contactor and circuit-breaker of France Schneider, PLC controller of Japan Mistubishi Companies, and frequency converter of Japan Yaskawa Electric Corporation. Those components have over load capacity and stable performance.
In general, the electric fault occupies 70% of all tower crane faults. However, "mingwei" tower cranes have fewer faults than others tower cranes, because of advantage of electric system design, fitness parameter of special motor, small impact, world-renowned electric components, and correct use of customers.
4. Safety-protection device
According to GB5144 safety regulation of tower crane, "mingwei" tower cranes are equipped with safety-protection devices such as moment limiter, overload limit switch, over hoist limit switch, slewing limit switch, trolley limit switch and anemoscope. In addition, "mingwei" tower cranes are equipped with many devices, which are advanced or original created by "minglong" such as automatic hook rate-changed device, original created double-tensile devices of trolley wire rope, trip-proof device of climbing, fast-hitch connectors fixed the slewing mast and jib or counter-jib. All these devices ensure the tower cranes safety and usage facility.
5. Structure
By means of optimal design, computer-aided design, three dimensions PRO/E design, modularity design and manufacture, electro-mechanical integration design, man-machine engineering design, Ideas or Adams engineering analyzing, the structure of "minglong" tower crane has gradely strength, stiffness, fatigue failure resistance and well overall performance.
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