Rail mounted container gantry crane

Rail mounted container gantry crane:

The rail mounted container gantry crane is composed of main beam, rigid and flexible gate legs, traveling trolley, lifting mechanism, crane traveling mechanism, electrical system, operating cab, etc. According to the operation process of the storage yard, the overhanging cantilever in the direction of single door leg or double door leg becomes the single cantilever or double cantilever model, and the non overhanging becomes the non cantilever model. Different structural forms of cantilever free, single cantilever and double cantilever are determined according to the site, container storage and transportation process and loading and unloading vehicles (container trucks or railway vehicles).

The rail type container gantry crane is divided into different forms according to the structure of main beam and portal leg and the anti rolling device adopted.

(1) Double cantilever rail type container gantry crane because the container needs to pass through the space in the door legs on both sides. Therefore, the clearance in the width direction of the door leg is large. According to the different forms of the main beam carried by the gate leg, the double cantilever rail type container gantry crane generally adopts the opening of the upper part of the gate leg into a "U" shape and the connection of the upper part of the gate leg“ Π” Shape. The structure of non cantilever rail container gantry crane is relatively simple because the container does not have to pass through the space in the door leg.

(2) Compared with the quayside container crane, the trolley running speed of the rail mounted container gantry crane is low, and generally there is no anti rolling device. If the user requests to reduce the operation intensity and improve the productivity, the anti rolling device is set. For rope type hoisting mechanism, its anti rolling is generally realized by applying damping to the rope; For the rigid lifting mechanism, its anti rolling is realized by rigid components. Rail mounted container gantry crane

Rail mounted container gantry crane is mainly used for container loading, unloading, handling and stacking in container railway transfer yard and large container storage and transportation yard.

The rail mounted container gantry crane is composed of main beam, rigid and flexible gate legs, traveling trolley, lifting mechanism, crane traveling mechanism, electrical system, operating cab, etc. According to the operation process of the storage yard, the overhanging cantilever in the direction of single door leg or double door leg becomes the single cantilever or double cantilever model, and the non overhanging becomes the non cantilever model. Different structural forms of cantilever free, single cantilever and double cantilever are determined according to the site, container storage and transportation process and loading and unloading vehicles (container trucks or railway vehicles).

The rail type container gantry crane is divided into different forms according to the structure of main beam and portal leg and the anti rolling device adopted.

(1) Double cantilever rail type container gantry crane because the container needs to pass through the space in the door legs on both sides. Therefore, the clearance in the width direction of the door leg is large. According to the different forms of the main beam carried by the gate leg, the double cantilever rail type container gantry crane generally adopts the opening of the upper part of the gate leg into a "U" shape and the connection of the upper part of the gate leg“ Π” Shape. The structure of non cantilever rail container gantry crane is relatively simple because the container does not have to pass through the space in the door leg.

(2) Compared with the quayside container crane, the trolley running speed of the rail mounted container gantry crane is low, and generally there is no anti rolling device. If the user requests to reduce the operation intensity and improve the productivity, the anti rolling device is set. For rope type hoisting mechanism, its anti rolling is generally realized by applying damping to the rope; For the rigid lifting mechanism, its anti rolling is realized by rigid components.

characteristic:

Rail mounted container gantry crane mainly has the following characteristics:

① The lifting speed is low and the crane running speed is high. According to the requirements of the container yard, the lifting height of the rail mounted container gantry crane is determined by stacking three times four or stacking four times five. Due to the low lifting height, the lifting speed is correspondingly low. However, the length of the container yard along the running track is generally long. In order to achieve a certain productivity, the crane runs at a high speed.

② The running speed of the trolley can be determined according to the span of the bridge and the extension distance at both ends. When the span and cantilever length are small, the trolley running speed and productivity requirements can be relatively small. When the span is large and the cantilever length is large, the running speed of the trolley can be correspondingly increased to meet the productivity requirements.

③ When the span exceeds 40m, when the crane is running at high speed, the deviation will occur due to the different running resistance of the door legs on both sides. Therefore, a synchronizing device is set to keep the running speed of the operating mechanisms on both sides synchronized through the electrical control system.

④ In order to meet higher requirements, the electric drive control system adopts thyristor DC or AC speed regulation drive control system to achieve better speed regulation and control performance. The electrical control system can also adopt conventional AC eddy current speed regulation control or AC stator voltage regulation speed regulation drive control system. For the electrical control system of the crane operating mechanism with high speed, the thyristor DC and AC speed regulation control system or AC stator voltage regulation and speed regulation control system with electrical braking is usually used to avoid using the brake braking method in the conventional electrical drive system when running and stopping, so as to avoid great impact on the whole machine. [1] 

Metal structure:

The steel structure of rail mounted container gantry crane generally adopts box structure. In order to reduce the weight of the whole machine, truss structure can also be used, but the manufacturing cost is high.

The structure of the whole machine is widely used depending on the support mode of the door leg“ Π” Type and "U" type“ Π” Both rigid and flexible door legs“ Π” The transverse stiffness of the two main beams and the strength and stiffness of the gate leg itself are realized by the stiffness of the gate leg and the crossbeam on the gate leg. The "U" structure door leg is realized by the connection stiffness between the door leg and the lower beam of the door leg.

(1) Main beam structure. The main beam structure is composed of two box end beams. The frame beam is supported on rigid and flexible legs. At present, the eccentric rail box girder is often used. In order to avoid the high stress zone caused by wheel pressure, the rail bearing part adopts "t" steel to weld with the main beam panel and bearing web. The main beam and rigid leg are connected by high-strength bolts or welding, and the flexible leg is connected by hinged connection. For convenient installation, the main beam and end beam are generally connected by high-strength bolts.

(2) Door leg structure. Both rigid and flexible portal legs adopt box structure. For rail type container gantry crane with medium and small span, both portal legs are made into rigid portal legs. Right“ Π” For U-shaped gate leg, the strength and stiffness along the crane direction are realized through the rigid connection between the gate leg and the top crossbeam; for U-shaped gate leg, it is realized through the rigid connection between the gate leg and the bottom crossbeam, while the strength and stiffness along the trolley direction are realized through the rigid connection between the main beam and the rigid gate leg. For the rail type container gantry crane with medium and small span, the deflection force on the portal legs and main beam caused by the unsynchronism of the cranes on both sides is borne by the rigid and single degree of freedom hinged connection of the main beam with the rigid legs and flexible legs.