Machine Equipment Forums

The deformation of the single beam crane structure is a common problem, and the single beam as the main load-bearing component of the jib crane is an inevitable problem. The horizontal distance, in m, between the rotating center line of the gantry crane and the plumb line of the fetching device. The amplitude of the non-rotating type boom crane refers to the horizontal distance between the center line of the spinner and the rear shaft of the boom or other typical axes. The intelligent crane is a multi-action lifting machine that lifts vertically and carries heavy objects horizontally within a certain range. [1] The work is characterized by intermittent movement, that is, the corresponding mechanism of taking material, migration, unloading and other actions in the more work cycle is alternately working, and the development and use of cranes in the market is more and more extensive. The double beam crane mainly includes lifting mechanism, operating mechanism, amplitude changing mechanism, rotating mechanism and metal structure. Lifting mechanism is the basic working mechanism of the crane, mostly composed of hanging system and winch, but also through the hydraulic system lifting heavy objects. In order to avoid the phenomenon of bridge deformation, the following studies are carried out to solve this problem:

Derrick deformation form. Single beam arch reduction, side bending, web wave deformation, end beam deformation, diagonal deviation. Cause of deformation. The main reason for the reduction of camber is (1) the influence of the internal stress of the structure. (2) overload and unreasonable use. (3) The influence of high temperature working environment. (4) Influence of design and manufacturing process. (5) The hoisting, storage and installation of the crane are unreasonable. (6) Unreasonable maintenance. Lateral bending causes (1) Horizontal bending in use. (2) Prefabricated side bending required by the manufacturing process. (3) Horizontal bending caused by structural member transformation. (4) The horizontal inertial force in use causes the single beam to bend inward. The wave deformation of the single beam web of the single beam crane is caused by the wave deformation of the web under the action of welding internal stress due to the uneven steel plate itself (no leveling treatment before welding) in the process of web splicing. 4, end beam deformation reasons (1) In order to improve the connection stiffness of the single beam and the end beam, sometimes in the head of the single beam and the end beam welded steel plate (or large Angle steel), so that the end beam outward bending. If the trolley gnaws heavily on the rail, the end beam will be deformed under the action of lateral forces. (3) Due to the deflection of the single beam in use, it will also lead to the deformation of the end beam. 5. Main end beam node horizontal direction oblique out-of-deformation causes. The methods to repair the deformation of the derrick are: prestressed reinforcement tensile method, prestressed wire rope tensile method, flame correction method


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