Roll paper folding mechanism chopper arm damage analysis and structure optimization method

Abstract

According to the damage analysis and structure optimization method for the hacking knife arm of the roll paper folding mechanism, the strength of the hacking knife arm is investigated by respectively establishing a kinematic pair gap-free dynamic mathematical model and a kinematic pair gap-containing finite element dynamic model of the folding mechanism, so that the checking result is more accurate; the degree of freedom of the hacking knife arm is obtained by establishing a virtual prototype of a folding mechanism, and the constraint modal analysis of the hacking knife arm is carried out by taking the actual constraint condition of the hacking knife arm as a boundary condition, so that the calculation result is more practical; topologically optimized removal materials are filled through the truss structure, the strength of the hacking knife arm is guaranteed, the structural rigidity of the hacking knife arm is changed by changing the rod width and the rod thickness of the truss triangular units, and therefore the inherent frequency of the hacking knife arm can avoid the working frequency.

Description

technical field [0001] The invention belongs to the field of printing machinery, and in particular relates to a method for damage analysis and structure optimization of a chopper arm of a web folding mechanism. Background technique [0002] The web folding machine is an indispensable unit on the linkage line of the web printing press. The paper is folded for the first time through the triangular plate, and through the cooperation of the cutting cylinder, the folding cylinder and the exit cylinder, the paper is folded for the first time. A whole strip of paper is automatically folded into eight or sixteen, which greatly improves the printing speed of newspapers or books. In recent years, with the continuous increase of raw material costs and labor costs, in order to ensure profits, printing companies have higher and higher requirements for printing speed; however, the increase in printing speed has brought problems of reliability and stability. For example, the knife-type fo...

AI Technical Summary

Problems solved by technology

For example, the knife-type folding mechanism of the N160 printing unit works stably at a speed of 25,000rph, but when the speed increases to 36,000rph, the folding mechanism will have problems, and the root area of ​​the chopper arm will be broken in a short time. Damage will occur, seriously affecting the production efficiency of printing enterprises

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