Crane Load Cell In Engineering

Stability of cranes

The stability of the crane means its ability to counteract the overturning moment.

Calculation of stability of the crane is made by the action of the test load, the load force (load resistance), no load (on site stability), and the sudden removal of the load assembly (disassembly).

Stability analysis is performed in accordance with the regulations, for example, RD 22-145-85 "mobile jib cranes. Norms calculate rollover stability. "The ratio between the reducing and overturning moment determines the stability of the crane against overturning. For different positions of the tap values and reducing overturning moments are different, so how the values of the acting forces, their shoulders and center of gravity of the crane. The crane should be provided for all of its provisions in all possible combinations of loads. These loads for mobile swing crane include:

- The weight to be lifted;

- Inertial forces at startup or braking of the crane;

- Centrifugal forces arising from the rotation of the rotating part of the crane;

- The power of the wind pressure on the load and tap controls.

Thus, the distinction cargo stability, the ability to tap to counteract the overturning moment created by the weight of the load, the forces of inertia, wind load operating condition and inherent stability - the ability to counteract the overturning moment of the crane when the crane in operation (including free shipping) and incorrect states.

Load stability test conditions: crane stands on sloping ground, exposed to the wind (standards for working conditions) and turns simultaneously braked descent cargo; boom mounted across the way (when installing the boom along the way can occur simultaneously braking and moving the crane); acting on the crane load weight, inertia forces arising during braking and landing cargo moving crane, the inertia force from the rotation of the crane, the wind load. Stability analysis is performed for all departures.

Lifting machines - a technical device cyclic action to lift and move cargo. They are usually divided into jacks, winches, hoists and cranes. GPM are high risk, so their operation should be carried out in strict accordance with the regulations, in particular in accordance with the Rules on the taps.

Level requirements GPM depends on the conditions of their operation (duty). Modes of operation of cranes and their mechanisms are accepted in accordance with the standard 4301/1. Depending on the maximum number of cycles and the use of crane-duty standard classification identified eight groups of cranes, which are considered when choosing a particular machine.

The main type of power equipment GPM are electric motors, but are used and internal combustion engines, and combined diesel-electric, electro and others require special attention ropes used as slings or traction in the mechanisms of the PMG.

In the general case of the PMG include metalwork and a number of mechanisms: the lifting movement, luffing, rotation. Requirements for their calculation and design established regulations. Widely used in warehouses and in manufacturing plants and factories are single-beam, double-girder overhead traveling cranes of general purpose and special purpose. Kind of bridge cranes stacker cranes are used mainly in warehouses packaged goods.

On the open storage materials handling by using gantry cranes and bridge cranes with a lifting capacity and span varying over a wide range. With the development of container transport are increasingly used gantry crane load cell with lifting capacity from 20 to 40 m, and provide tiered storage containers. If you want to serve the warehouse width of several hundred meters, then it may be appropriate cable crane with a span of 250 ... 500 m.

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