The mobile girder rail gantry crane is a bridge-type crane in which the horizontal bridge is set on two legs to form a gantry shape. This kind of crane operates on above-ground rails and is mainly used for transportation and installation operations in open storage yards, shipyards, power stations, ports and railway cargo stations. SEVENCRANE is one of the famouse Chinese supplier mobile girder rail gantry crane factory Besides, the european standard mobile girder rail gantry crane price in SEVENCRANE is reasonable and the quality is high. Please inquiry at any time if you want to buy our products.
The mobile girder rail gantry crane consists of the main beam, rigid and flexible door legs, operating trolley, lifting mechanism, cart operating mechanism, electrical system, operating cab, etc. According to the yard operation process, the cantilever can be extended in the direction of the single door leg or the double door leg to become a single cantilever or double cantilever model, and if it is not extended, it will be a non-cantilever model. According to the location, container storage and transportation process, and loading and unloading vehicles (container trucks or railway vehicles), confirm the selection of different structural methods without cantilever, single cantilever, and double cantilever.
In container distribution areas such as ports and terminals, the use of rail-mounted container gantry cranes is already relatively common. This is mainly because mobile girder rail gantry cranes have the following advantages:
1. The span of the rail-mounted container gantry crane is relatively large. It can generally accommodate 8 to 15 rows of containers stacked in the middle of the span. It can also place multiple lanes in the middle of the span, so that the site space can be better used.
2. Generally speaking, mobile girder rail gantry cranes are equipped with various equipment that are conducive to intelligent control and automated operations, such as storage systems, retrieval systems, positioning systems, etc., plus the use of high-speed organizational designs. , which greatly improves the working efficiency of the equipment.
3. Because the rail-mounted container gantry crane is driven by electric energy, it has certain advantages in reducing noise and eliminating exhaust emissions, and is a more environmentally friendly equipment.
In addition, the safety protection of the gantry is often not in place or standardized during use, and there are many problems:
1. Due to improper installation and maintenance, when the hanging basket is in place, the spring-controlled support rod cannot be reliably supported on the docking frame, and the load cannot be fully borne by the docking frame, resulting in stress on the wire rope. When operators enter and exit the hanging basket At this time, the gondola will shake and sink significantly, and it cannot prevent the gondola from falling due to sudden breakage of the wire rope or failure of the winch brake.
2. There are no protective doors at the discharge openings on each floor of the building, or they are not used after being installed. There are no protective railings and foot guards on both sides of the discharge port in accordance with edge protection regulations. After the construction entered the decoration stage, the protective doors were even removed, leaving workers on each floor without edge protection and unable to prevent collisions and falling accidents from heights for people loading and unloading materials during the operation of the hanging basket.
3. There is no protective shed above the ground feed inlet of the gantry. Even if there is, the length of the protective shed is mostly shorter than the specification. It is not set according to the falling radius of the object. The shortest length is even less than 1 meter, which cannot effectively prevent the feed inlet. Falling objects and impact accidents.
4. The unloading platform set up at the unloading port of the floor is not standardized. It is not connected to the building structure in a self-contained system, but is connected to the scaffolding; the platform is not fully covered with wooden boards, and the wooden boards are not fixed, and even steel formwork is laid on the platform. Instead of wooden boards, it is easy to cause workers to fall from high altitudes.
5. When the winch is close to the working area, the protective ceiling of the winch does not meet the requirements. Some only lay a layer of asbestos tiles or a single layer of bamboo plywood, which does not have the ability to prevent objects from being struck, and cannot guarantee the reliable operation and operation of the equipment. Operator safety.
6. There is no protective railing or protective net on the side of the winch facing the gantry. Once the wire rope breaks, it will cause harm to the operator.
7. When the winch wire rope crosses the road, it is not protected by the road. It cannot avoid crushing and damage. It is also extremely unsafe for on-site workers when crossing.
8. There is no protective roof plate above the overhead gantry basket, or the 5cm thick wooden board is not laid as required, and some only lay a layer of bamboo plywood. The elevated gantry has a long running distance up and down and passes through many working floors. If the protective roof is not installed as required, the workers entering the hanging basket cannot be prevented from being hit by falling objects from above.
9. A channel is formed at the bottom of the gantry, and workers can pass through it freely from the lower part of the frame. Once the hanging basket moves downward or there are falling objects above, it will cause harm to the workers.
10. The overrun of the upper limit limiter of many gantry frames (the distance between the highest position of the hanging basket and the lowest part of the sky beam) is less than 3 meters, which does not meet the specification requirements. In case of unexpected situations (such as mechanism or electrical failure) ) When the electromagnet cannot be disconnected, the driver does not have enough time to use the emergency power-off switch to cut off the power supply, which will prevent the hanging basket from colliding with the overhead beam.
11. The overhead gantry is not equipped with an overload limiter. When the load exceeds the rated load, the lifting power cannot be cut off.
To sum up, we must pay great attention to the fact that gantry is used a lot at the construction site and has many safety hazards, and strengthen the safety supervision and management of all aspects of the manufacturing, installation and use of gantry. intensity. Eliminate hidden dangers in time to prevent accidents and ensure the safety of the gantry. Last but not least, SEVENCRANE mobile girder rail gantry crane manufacturer is one of the famous crane exporters in China, and we also is the CE approved mobile girder rail gantry crane supplier. The mobile girder rail gantry cranes we produce are all produced in strict accordance with safety regulations and processes, so the quality of our products is well received by customers. If you are interested in our products, please feel free to call us!
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