Double girder overhead travelling crane is mainly composed of the following structures:

1. Main girder: the key part to carry the goods, usually box-shaped double girder structure, with good carrying capacity and stability.
2. End girder: the part connecting the main girder and the wheels, which is used to support the crane running on the track.
3. Running trolley: installed under the main girder, used to support and drive the crane to move on the track.
4. Hooks and lifting system: including hooks, wire ropes, pulley sets, etc., used for lifting and moving goods.
5. Electrical system: including motors, controllers, etc., which are used to control the operation and lifting action of the crane.
6. Other auxiliary structures: such as rails, wheels, buffers, etc., to ensure the stable operation and safety of the crane.

Double Girder Overhead Crane is well-designed to meet the lifting and handling needs of various heavy items.

Double girder overhead travelling crane is a kind of lifting equipment used for material handling, and its working principle is to convert electric energy into mechanical energy through electric power drive to realize the lifting and moving of heavy objects. Its structure is mainly composed of double girder, bridge, running mechanism and electrical control system. When working, the motor drives the trolley and trolley running mechanism to make the crane walk on the track; at the same time, the electrical system controls the rotation of the reel and adjusts the length of the wire rope to realize the lifting and moving of the heavy load. The whole working process is precise and efficient, widely used in various industrial fields.

Container spreader is an important logistics equipment, mainly used for lifting and handling containers. Its main functions include: lifting containers safely and quickly, realizing the rapid transfer of containers between different means of transport; adapting to a variety of specifications of containers, by adjusting the parameters of the spreader, it can cope with different sizes of containers; improving logistics efficiency, reducing the cost of manual handling; ensuring the stability of containers in the process of lifting and lowering the risk of damage; monitoring the status of the spreader, and some of the high-level spreaders are equipped with automatic detection and alarm function to ensure safe use. In short, container spreader plays a key role in logistics transportation, improves the transportation efficiency and guarantees the safety of goods.

Container lifting equipment mainly has the following types:

1. Container frontal crane: applicable to land container lifting, can be flexibly moved, efficient loading and unloading.
2. Container transporter: it can flexibly transfer containers between the spans, and is suitable for container stacking and transshipment.
3. Container stacker: used in container yard operation, can stack high, loading and unloading of multiple containers.
4. Container cranes (port cranes): mostly used in ports, can lift large containers for transferring between ships and warehouses.
5. forklift: for small containers, forklift is also a common lifting equipment.

These equipments are selected according to the usage scenarios and factors such as container size and weight to improve the efficiency and safety of container logistics.

Container lifting equipment mainly includes container frontal crane, container stacker, container straddle carrier and container loading and unloading bridge. Front crane and stacker are mainly used for container loading, unloading and handling, with flexibility and high efficiency. Transporter is suitable for horizontal transportation of containers, can move quickly within the span. Loading and unloading bridges are mainly used for container loading and unloading in ports, and their biggest advantage is that they can match the container transportation between ships and terminals. These equipments greatly improve the transportation efficiency and safety of containers, which is an indispensable part of modern logistics. According to the actual demand, choosing the right container lifting equipment can greatly improve the working efficiency.