关键词: 钢卷打捆, 延迟锁扣, 预加热, 二次收紧

Abstract: The loose coil problem was a common problem in hot steel coil bundling, which seriously affected the transportation safety and product quality of steel coils. The detailed processes of hot steel coil bundling were analyzed, and the temperature difference between steel coils and steel strap was pointed out as the main reason for the problem of loose coil. Therefor a delay locking buckle technology was proposed. The pre-heating of the steel straps was achieved through the delay locking buckle. The steel coil were no longer loose in cold state by controlling the minimum bundling force for secondary tightening. The pre-heating time was calculated, and the calculation formula of the delay locking buckle time was deduced. Based on the analysis of the relative deformation of the steel coil and the steel strap, the minimum bundling force for secondary tightening was determined on the premise of ensuring the standard residual bundling force. Experiments were performed on the automatic bundling machine using the delay locking buckle technology, and the results show that the technology may effectively solve the problem of loose strap and improve the quality of steel coil bundling.

Key words: steel coil bundling, delay locking buckle；pre-heating, secondary tightening