Experimental Studies of Metal Structure Loads When Using Rolling Wheels of the New Design

The article considered the problems of experimental determination of the advantages of running wheels of a new design with elastic inserts. The study was carried out on an operating electric, support, two-girder bridge crane with a load capacity of 10 tons and a span of 22.5 m. With the help of strain gauges assembled in a half-bridge circuit and connected to the Zetlab210 analog-digital converter, the deformations of the main beam at the moment of lifting and moving a load of different weights were determined. The lifting and moving of the cargo was carried out under the same conditions on standard wheels of the cargo cart and on wheels with an elastic rubber insert. Graphs of the deformation of the main beam were obtained. In the further calculation, the dependences of the stress state at each moment of the movement of the load were obtained when using both standard wheels and wheels with an elastic rubber insert. The dependences and duration of oscillations that occur during the cycle of lifting and moving the load were also revealed. The cycle of the experimental study consisted of lifting the load in the extreme left position with the cargo cart, moving the cargo to the extreme right position, and returning the cargo cart with the cargo to the initial position. The scientific novelty of the work consists in the application of a new, modernized design of the running wheels of a cargo cart with an elastic rubber insert, which effectively dampen fluctuations in the metal structure of the bridge crane. Experimental studies of loads that occur in the metal structure of the bridge of the overhead crane were carried out using double-sided cylindrical wheels on the truck of the operating overhead crane. During the registration of the resulting loads, the standard wheels were first installed on the trolley of the overhead crane, then the standard wheels were replaced with modernized wheels (with an elastic, rubber insert). According to the results of experimental studies, it was found that the stress in the main beam of the bridge crane was reduced by 18% and reducing peak vibrations by 20 seconds at the same load lifting and moving cycles. Also, when using wheels with an elastic rubber insert, the damping period of oscillations at the end of the load movement cycle is reduced by at least 30%.