santo gantry crane

2013年8月16日星期五

In the steel plant in the crane inspection a few questions

Crane girder stiffness measurement
     Girder stiffness discrimination law traditionally used water level in the main beam span suspension ruler,bridge gantry crane ruler hanging under heavy preload, with the water level in the main beam were measured in the no-load and rated load corresponding cross tape readings, calculates elastic deflection under the main beam main beam stiffness values ​​to determine eligibility. In fact, the main beam in the amount of reading under load, both actual elastic deformation of the main beam, as well as the rail beam deformation, cart wheel assembly space, car assembly ask gap, cart track and trolley track deformation, deformation hoisting rope and so on. Plant for the installation of the concrete structure of the crane, the elastic deformation of the main beam other than said several larger, assembly gap and the track deformation is negligible; but the crane of steel plant, which the rail beam,hoist gantry crane in its amount of wheel load reduction will have a greater flexibility under torsion (measured about 2 ~ 3 mm), will be added to the crane girder deformation measurement values​​, resulting in large errors. Therefore, the conventional method to measure close to or exceeds the threshold value when the S/800 (S span of cranes), especially for the rail span crane beam span where a small tops should be considered under the rail resilient deflection of the beam . The following methods can be used to verify and then measured again: each of the two ends of the crane beam and the main beam span inside hanging in three scales,jib crane respectively, with heavy preload, with the water level were measured cranes at no load and rated load under the three gauge readings, and then calculate the amount set under the main beam deflection under actual elasticity values​​, l = H a (H1 + day 2) / 2. Where day, H1, respectively, across the main beam, the left-side and right-side beam beam scale at no load and rated load down the reading difference.

没有评论:

发表评论