Main beam form and working handling of gantry crane
Gantry cranes, also known as gantry cranes, are mainly used for loading and unloading operations in outdoor freight yards, storage yards, and bulk cargo. The application of cranes has greatly reduced handling risks and labor costs, and has also accelerated work efficiency. As a professional manufacturer of single-girder bridge double-girder gantry cranes, the metal structure of the gantry crane produced is similar to that of the frame. There is a main beam in the middle for operation and transportation. The main beam plays the role of bearing. Two pulleys are set under the legs to allow the crane to walk directly on the track on the ground. The two ends of the main beam are provided with cantilever arms that can be extended. There are various types of portal cranes. Diverse, according to the purpose, structure, appearance will have different names.
There are several types of gantry cranes such as door frame structure form, main beam form, main beam structure and use. According to the door frame structure, it can be divided into gantry cranes and cantilever gantry cranes, gantry cranes are divided into full gantry cranes and semi-gantry cranes, and cantilever gantry cranes are divided into double cantilever gantry cranes and single cantilever gantry cranes.
According to the form of the main beam, it can be divided into single main beam gantry cranes and double main beam gantry cranes; according to the structure of the main beam, it can be divided into truss beams, box beams and honeycomb beam gantry cranes. Divided into ordinary gantry cranes, hydropower gantry cranes, shipbuilding gantry cranes, container gantry cranes.
In addition to the main structure of the gantry crane, there are many detailed structures. These are important parts of the gantry crane, and the crane cannot run without any part.
Overload protection device
Whether the overload protection device is sensitive and reliable, meets the design requirements, the opening pressure of the hydraulic overload protection device; whether the comprehensive error of the mechanical, electronic and comprehensive overload protector alarm and cut off the set point of the power source meets the requirements.
Torque limiter
Torque limiter is a safety device for boom-type cranes to prevent overturning. Check the sensitivity and reliability of the torque limiter by the amplification method or the weight increase method, and check whether the comprehensive error of the torque limiter alarm and the set point of cutting off the power source is within the specified range.
Limit position limiter
Check whether the luffing mechanism of the lifting equipment, the lifting mechanism and the running mechanism reach the set position distance, and whether an alarm signal can occur and automatically cut off the power source running in the dangerous direction.
Windproof device
For gantry cranes where the height of the articulation point at the root of the boom is greater than 50 meters, the anemometer should be checked, and whether the alarm can be accurately reported when the wind speed set point is reached or the working limit wind speed is reached. Cranes that operate on the track in the open air should check whether the parts of the rail clamp, iron shoes, and anchoring device are deformed, defective, and the reliability of their independent work. For automatic rail clamps, the reliability of the windbreak function and the electrical interlock switch function in the non-anchored state should be checked in conjunction with the sudden gust windbreaker and the brakes of the cart.
