Replacing the Lower Bearing of the Door Machine Using the Jacking Method (4)

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10) Position the door machine in a lower position and carefully inspect whether the upper support ring roller, raceway, and other components moved during the construction are functioning properly. If there is a significant straightness error, corrections must be made. 11) Install the middle slip ring, ensuring that the central pipe interface is properly aligned. Connect the cables according to their designated numbers, and avoid any incorrect connections. 12) Reverse the planetary pinion of the device. 13) Remove the windproof rope at the top of the nose bridge and take off the chain hoist from the locking arm. 14) Pack up all construction tools and clear the work area. Recheck the condition of each component and remove any debris around the door machine. 15) Connect the power cable, turn on the power, and perform a reverse test. Start with a few short rotations, then gradually increase the speed to normal operation. Pay attention to whether the intermediate slip ring follows smoothly and if the bearing operates without abnormal motion or any other unusual conditions. 7. Comparing the two methods of replacing the support bearing, using the floating crane method involves more dismantling and requires over 10 workers, taking about 7 working days, with 3 days involving the use of a floating crane. On the other hand, the jacking method results in less opening and fewer disruptions, requiring only 7 workers and completing the task in 2 working days without the need for a floating crane. Excluding labor costs, just the rental of the floating crane alone would cost 13,500 yuan. Additionally, considering the downtime of the door machine, which can load and unload 100 tons per hour, a 5-day delay could result in 4,000 tons of goods not being handled. From this comparison, it's clear that the economic benefits of using the jacking method for replacing the lower bearing are significant. The above process outlines the reversal of the lifting method for the support bearing, and it can be applied to various types of door machines depending on their layout.

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