Description:
In order to avoid the compression instability of the rapier belt without guide hook constraint in the process of high-speed operation, the load characteristics of the rapier belt in the process of weft insertion are studied.

According to the running environment of the rapier belt, the kinematics of the weft insertion mechanism of the loom is analyzed, and the functional relationship between the inertia force of the rapier belt and the rotation angle of the spindle is obtained; Based on the strut instability model, the actual constraints of the rapier belt are simulated, and the calculation formula of the critical load of rapier belt instability is obtained; By quantifying the instability condition of the sword, the instability force of the inertial structure is less than the critical load of the model.

The research shows that the higher the loom speed is, the greater the inertia force on the rapier belt is; The gap between the sword belt and the static guide rail is the key factor affecting the instability of the sword belt; The smaller the door width of the loom, the smaller the quality of the rapier head, the greater the stiffness of the rapier belt, the smaller the gap between the rapier belt and the static guide rail, the smaller the weft tension, the lower the running speed, and the rapier belt is not easy to lose stability. According to the load characteristics of rapier loom, the measures to avoid rapier belt instability are put forward: when designing loom, the door width of loom should be limited, the quality of rapier head should be reduced, the stiffness of rapier belt should be enhanced and the weft tension should be reduced; When the loom is used, the gap between the rapier belt and the static guide rail should be strictly controlled and the speed should be reduced appropriately.
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