How does a gantry crane lift a container?

Some have special hand gripping, and some are hoisted with wire ropes and hooks. As shown in the figure below.

Gantry crane is a deformation of overhead crane, also known as gantry crane. It is mainly used for the loading and unloading of outdoor freight yards, material yards and bulk cargo. Its metal structure is like a door-shaped frame, and two feet are installed under the bearing main beam, which can walk directly on the track on the ground, and the two ends of the main beam can have overhanging cantilever beams.

Gantry cranes have the characteristics of high site utilization, large operating range, wide adaptability and strong versatility, and are widely used in port freight yards.

For this problem, first of all, it is necessary to clarify what kind of gantry crane is specific. Because gantry crane is a general name, there are many kinds of specifics, their main feature is that they have a high gantry structure, divided into general-purpose gantry cranes, container gantry cranes, rubber tyred gantry cranes, etc., strictly speaking, it can also refer to the quay wall container loading and unloading bridge. And the above-mentioned various cranes can use a variety of work rigging according to the needs respectively, including container special spreader, simple spreader, wire rope with hook, wire rope beam with wire rope and so on.

Therefore, the stress points need to be analyzed separately.

As for lifting, it is usually the motor that drives the reel, and the reel drives the wire rope to lift the container through pulleys, brackets, hooks, etc.

For **, there are too many types, if you really need to, please indicate which type of crane is specific. A schematic diagram of lifting force analysis can be provided.

It's a directional lock that can be lifted by locking it on the four corners of the container, and the stress point is on these four locks, and the hanging distance can be extended by 20 to 45 feet.

For the size of the gantry crane for 20-foot containers, in general, the following requirements need to be met:

1.Boom length: generally 20-25 meters, can be adjusted according to the actual situation;

2.Boom width: generally meters, can be adjusted according to the actual situation;

3.Boom height: generally 3-4 meters, can be adjusted according to the actual situation;

4.Boom weight: generally 20-25 tons, can be adjusted according to the actual situation;

5.Boom rotation angle: generally 90 degrees, which can be adjusted according to the actual situation.

The methods and practices to solve this problem are as follows:

1.First of all, according to the actual situation of the shirt training file, determine the size of the gantry crane of the 20-foot container or random box;

2.Then, according to the actual situation, determine the boom length, width, height, quality and corner;

3.Finally, according to the actual situation, determine the installation position of the boom and the installation method of the boom.

When determining the size of the gantry crane for a 20-foot container, it is necessary to consider the quality, size, angle and other factors of the boom, as well as the installation position and installation method of the boom to ensure the safety and stability of the boom.

To lift a 20-foot container, you must first understand the size of the gantry crane. Generally speaking, the width and height of the gantry crane are designed and manufactured according to the height of the needy friend, and the specific size may vary depending on the manufacturer, model and use. But under normal circumstances, the width of the gantry crane for lifting a 20-foot container should be more than 8 meters, and the height should be more than 6 meters.

In addition, the arm length of the gantry crane should also be considered, generally speaking, the arm length of the gantry crane lifting a 20-foot container should be about 25 meters. Of course, the specific size needs to be adjusted and determined according to the usage scenario and actual needs.

The size of the gantry crane needs to be determined according to the specific situation, because the size of the gantry crane may be different for different models and products. In addition, the individual dimensions of a 20-foot container are long meters, wide meters, and high meters. If you need to lift a 20ft container, first find out if the gantry crane you have on hand can meet the task, and make sure that all safety specifications and procedures are followed when using it.

The length of the socks is 12062mm, and the width is 2350mm. The width and height of the door frame size are 2035mm and 2284mm respectively

Container gantry crane drivers must go through professional training and assessment before taking up their posts, and can only operate after obtaining specific operator qualification certificates. He must comply with the relevant rules and regulations throughout the operation.

In the preliminary preparation work, for the container gantry crane, an appropriate amount of oil should be injected to ensure that the oil path is unblocked, so as to avoid unnecessary accidents caused by blockage. And before turning on the machine, turn off the air switch, turn on the power supply, then clear the obstacles on the walking track, and then check the various control panels and safety limit switches to see if the voltage is in a normal balance state. Before running the container gantry crane, a signal should be sent to notify other workers to leave the danger zone.

The spreader alignment of the container door crane must be accurate, and the container can only be lifted after the lock is locked. If the stacking position is skewed, the rotating device can be driven to align it first to avoid other dangers caused by tilting accidents during rotation. At the same time, it is strictly forbidden to pull and place the container obliquely.

If the working environment is windy, it is also necessary to stop the operation.

When the container door crane is hooked, it can be tested first, and the brake test can be carried out when the container is lifted away from 200mm to ensure that the equipment is in good condition. Under normal circumstances, it is strictly forbidden to cross the container on a person, but in special cases, if necessary, it should be at least half a meter above the highest point of the container level.

When loading and unloading containers, it should also be ensured that the hook and rigging center of the gantry crane are facing the container center and are in a horizontal state. The speed should be smooth during operation. When unloading, it should be handled at a low speed and maintained at a constant speed as much as possible.

The driver must strictly follow the new high operation of the commander and confirm the separation before continuing to work. Once the container is loaded onto the vehicle, make sure that the lower four corners of the box fit snugly against the floor plate. If there is a notch, it needs to be re-operated until it fits perfectly.

I have a post certificate, a brief introduction to the gantry crane operation.

The operation of the gantry crane needs to be trained by special operation personnel, obtain a job certificate, and be agreed by the project manager or supervisor to sign the relevant agreement before it can be operated. The security law has strict regulations on this.

Because the gantry crane, especially under the open conditions of the engineering site, the danger is relatively large, and the operation, storage and maintenance require comprehensive professional skills.

Gantry cranes generally have three sets of control systems, one is the control panel of the driving building, the other is the wire control, and the third is the remote control, which can achieve full-function control. The main actions include the longitudinal forward and backward of the door operator, and the identification on the control panel: "east" and "west"; The electric hoist moves left and right, and the control panel is marked with :

South, North; The hook moves up and down, and the control panel is marked with the words: "up" and "down". It seems to be relatively simple, in the process of operation, it is necessary to control the advance amount of stopping, so as to run at a uniform speed, accurate positioning, control the balance movement of the lifting object, and control its swing amplitude.

After the gantry crane is used, the hook should be put away in time, the electric hoist should be moved to the parking position, the door brake valve should be locked, and the windproof cable should be tightened if necessary before leaving.

This is just a basic operation, and there are many details that need to be paid attention to when working, and experience and proficiency are important.

How to open, that requires professional training, can you explain it clearly just by talking?

Gantry cranes are large cranes. The beam and column structure is in the shape of a door, which can be moved on the track and has a large lifting capacity. The gantry crane is a rail-mounted container crane, which has the advantages of energy saving and environmental protection, high reliability, large lifting capacity, small maintenance workload, and easy to realize automatic operation.

The door frame structure is divided into gantry crane and cantilever gantry crane.

Gantry crane 1, full gantry crane: the main beam has no overhang, and the trolley is carried out within the main span.

2. Semi-gantry crane: the outriggers have a height difference, which can be determined according to the civil engineering requirements of the site.

Cantilever gantry crane 1, double cantilever gantry crane: the most common structural form, the force of the structure and the effective use of the site area are reasonable.

2. Single cantilever gantry crane: This structural form is often selected due to the limitation of the site.

Main beam form 1, single main beam.

The single girder gantry crane has a simple structure, easy manufacturing and installation, and its own quality is small, and the main beam is mostly a deviating rail box frame structure. Compared with the double girder gantry crane, the overall stiffness is a little weaker. Therefore, this form can be used when the lifting capacity is 50t and the span is 35m.

The door leg of the single girder gantry crane has two forms: L-type and C-type. The manufacturing and installation of the L type is convenient, the stress situation is good, and its own mass is small, but the space at the place where the lifting goods pass through the outrigger is relatively small. The C-shaped legs are made inclined or curved in order to have a large lateral space for the goods to pass smoothly through the legs.

2. a double girder.

The double girder gantry crane has strong carrying capacity, large span, good overall stability and many varieties, but its own quality is larger than that of a single girder gantry crane with the same lifting capacity, and the cost is also higher. According to the different main beam structure, it can be divided into two forms: box beam and truss. Generally, the box-shaped structure is mostly adopted.