rope hoist rope in use persistent extension if the request requires negligible or must be reduced to a minimum within the range, it must be pre-stretched.
What follows is a brief introduction of the pre-stretch rope hoist and two methods commonly used in pre-stretch
The so-called pre-stretch, refers to hoist rope in use so that lasting extension, reducing the Wire rope hoist inadvertently in the course of the security risks posed overload, the common methods include dynamic and static
1， dynamic pre-stretch: This stretch is in the closed wire rope
Wire rope hoist for the process, and the winding of the wire rope before the final pre-stretch machine loaded on general relay. In this process, the analog actual rope pretensioned the tensile breaking and bending the composition.
2, the static pre-stretch: loaded on a wire about breaking force loads, load cycling through a series of all times maintain a certain time until the load wire rope produced entirely plastic deformation, and then uninstall.