Selection of commonly used equipment for bridge cranes

Electric control designers of bridge cranes not only pay attention to the various functions required for the operation of bridge cranes, but also include the reliability and durability of the system under normal operating conditions of the crane. The designer also needs to ensure that: when an incident occurs, the bridge crane will not have a problem, or when the crane has a problem, the problem can be manipulated or not expanded.

Therefore, based on the above circumstances, steel structure occupations and mold occupations should choose bridge cranes above A5. In addition, in order to reduce the failure rate, a frequency conversion control system and PLC can be installed. The application of the frequency conversion control system improves the running stability of the vehicle, better maintains the electrical system, and reduces the fault rate.

PLC is a programmable control system. It not only has a self-diagnostic function, but also has an outstanding display function. When PLC or external input devices and actuators have faults, programming according to the information provided by LED or PLC can easily determine the cause of the faults, and can be quickly cleaned up by the following methods: replace the module.

Crane operators improperly operated, some parts were damaged, and many accidents occurred at the same time. Each component (including cables) of the electronic control system of the bridge crane has upper maintenance (open circuit and overload), and the unmaintained equipment shall be specially treated.

If the human body touches any part of the system, whether it is a normally charged part (directly touched) or a part that may be charged when it is faulty (directly touched), there will be no danger to life. All directions that cannot be directly or directly touched by the safety maintenance system have been specially processed. The important control points of the bridge crane control system are redundant. There are control logic redundancy and equipment redundancy. Such as electromechanical interlocking redundancy, PLC control logic and relay control logic redundancy, relay (toucher) electric shock series coil parallel redundancy, etc.

The operation level of the bridge crane is set according to the degree of heavy operation of the crane, that is, the parameters that indicate the heavy operation of the crane according to the time and full load. Bridge cranes are divided into three categories: A1-A3 (light), a4-a5 (medium), a6-a7 (heavy) and seven types.

Light weight (A1-A3): The additional load of lifting is very small, generally light lifting weight, mainly used for equipment and maintenance of power plants or other workplaces, or infrequently used workshops and warehouses.

Medium (a4-15): Sometimes additional load is added, generally medium load. It is suitable for workshops and warehouses that are frequently used such as general mechanical processing workshops and repair workshops.

Heavy load (a6-a7): If the additional load is increased as usual, the heavier load will generally be increased. For example, it is used in heavy workshops and warehouses to lift heavy objects for a long time.

Most of the safety measures of bridge cranes are guaranteed by equipment, not by human knowledge. The control system of bridge cranes should consider all "impossible" faults as much as possible. As far as possible, the bridge crane uses the action feedback of the integrated acquisition system to judge whether the operation of the system is normal and controlled.

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