Breast-roll set replacement method and hoisting clamp thereof

Abstract

The invention discloses a method for changing a breast roll of a rolling mill. The method for rapidly changing the breast roll comprises the following steps: A. placing two hangers between a guide rack and a breast roll assembly; B. connecting the hangers and the guide rack; and passing a bolt having a connecting clamping head into each hanger, screwing the bolt and being clamped at the roll body of the two adjacent breast rolls; C. lifting the breast roll assembly upwards by the hanger; D. putting the breast roll assembly down to a roll bedding rack through a guide lifting cylinder; E. separating the guide rack from the hangers; F. transporting the roll bedding rack and the breast roll assembly out of the stander by a working roll channel to finish the dismantling of the old breast roll assembly; and G. finishing the installation of a new breast roll assembly by the similar way. The invention further provides a lifting clamping tool used in the method. The method and the lifting clamping tool have the advantages of high degree of automation, simple operation, large reduction of the labor intensity of workers, convenient storage and low cost.

Description

technical field [0001] The invention relates to a method for changing rolls of stand rolls of a rolling mill and a hoisting fixture device used therein, and is especially suitable for group replacement of rolls of a reversible rolling mill stand of wide and thick plates. Background technique [0002] For reversible rolling mills for wide and thick plates, in order to facilitate the smooth input and output of slabs, a set of rack rolls are installed at the front and back of the rolling mill. rolling. When the rack rolls are used for a certain period of time and wear occurs, the rack rolls must be replaced with the rack roll changing device. [0003] Be that the utility model patent of application number 99232166.2 discloses a kind of easily replaceable frame roll of thick plate mill, its structure is frame welding type dolly, is provided with pivoting arm on dolly. When changing the stand rolls, each group of stand rolls is replaced twice. The single stand roll near the out...

AI Technical Summary

Problems solved by technology

Problems and defects of this technology: 1. The roll changing trolley is large in size (6370mm×2010mm×700mm) and heavy (~7.65 tons), which is extremely inconvenient for transportation and storage; 2. After the rack roll changing trolley is pushed into the rolling mill , it is necessary to manually open or close the rack roller changing arm. Due to the heavy weight of the arm and the limitation of the space position, it is difficult to rotate the arm by 90° to the working position according to the design requirements during operation; 3. Roll changing time Long, it takes about 1-2 days to replace the rack rollers once; 4. The labor intensity of the workers is high

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