Overhead Crane Lubrication Precautions and Causes of Weld Deformation

Lubrication precautions for overhead cranes

Overhead cranes are used for lifting operations almost every day on construction sites, so daily maintenance is a must for every crane company. In addition to the routine inspection of components, we must also regularly add lubricants to a crane to ensure their normal operation. So what should we pay attention to when lubricating cranes?

  • The main purpose of lubricating overhead cranes is to control friction, reduce equipment temperature, reduce wear and tear, prevent rusting of parts, and form a seal.

  • These functions rely on each other and affect each other. If friction cannot be effectively controlled, the goal of reducing wear and tear cannot be achieved, resulting in a large amount of friction heat on the overhead crane and causing high temperature of the overhead crane spare parts, which leads to damage to the lubrication and lubricating materials on the friction surface.

  • Overhead cranes with shafts, hole matching parts, and mechanical parts with relative motion friction surfaces must be lubricated regularly, as required for all types of cranes.

  • The lubrication requirements for each lubrication point of overhead cranes are also different due to different working conditions.

  • For all types of overhead cranes, including the explosion proof overhead crane, and different lubrication points, periodic maintenance and regular inspections must be carried out according to the instructions, and qualified grease must be used for lubrication to ensure normal operation of the machines and overcome early wear.

  • The use of unqualified substitutes will cause accidents on the overhead crane equipment, directly damage the equipment parts, and affect safety production.

Main reasons for welding deformation of overhead cranes

Overhead cranes are lifting devices that are hoisted in the air above workshops, warehouses and material yards. Because its two ends are located on tall cement pillars or metal supports, it looks like a bridge. Overhead cranes are widely used in construction and production, but many problems arise during use.

During maintenance, it was found that the overhead crane had welding deformation, and its control became an urgent problem to solve. Since the cross-section shape of the overhead crane is a typical box beam structure with many welds, complex structure, large welding stress and deformation.

If a reasonable design and construction process is not adopted, deformation will occur during the welding process, which seriously affects the welding quality and may even cause the structure to be installed and used incorrectly.

It is important to fully understand the reasons for deformation in order to control welding deformation. This can help take appropriate measures based on specific situations to reduce the degree of welding deformation as much as possible, enabling the structure to be used correctly and reasonably and improving various performance of overhead cranes to provide better construction guarantees.

Usually, the main reason for welding deformation of overhead cranes is uneven heat input. The size of heat input is closely related to the material and structure of welding. Material factors and structural factors jointly affect the metal movement around the heat source, making the overhead crane affected by internal and external constraints at the same time, causing welding materials to produce stress deformation.

Welding deformation mainly includes shrinkage deformation (longitudinal and transverse), bending deformation, angle deformation, wave deformation, and torsion deformation. This is reflected in the external structure of the overhead crane showing local bulging, distortion, bending, and twisting.

During welding, these problems can occur due to many reasons, such as insufficiently accurate dimensions of the weld, the number of welds does not match the predetermined standards, large errors between the welding position and the design position, weak thermal and physical properties of welding materials, and construction processes that are not conducive to achieving good welding conditions, as well as the selection of welding parameters. Each specific aspect must be carefully handled to achieve ideal results.

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