DEVICE AND METHOD FOR PRE-LOADING MECHANICAL SINGLE PROP WITH CONSTANT RESISTANCE

摘要

Disclosed is a device for pre-loading a mechanical single prop with a constant resistance, the device comprising a rhombic stretchable bracket (3), a screw rod (2), a first cylindrical collar (4) and a second cylindrical collar (6). The screw rod (2) is connected to two opposite vertex angles of the rhombic stretchable bracket (3), a tail end of the screw rod (2) is fixedly connected to a vertex angle of the rhombic stretchable bracket (3), an end head of the screw rod (2) passes through another vertex angle of the rhombic stretchable bracket (3), and the two remaining opposite vertex angles of the rhombic stretchable bracket (3) are respectively fixedly connected to the edges of the first cylindrical collar (4) and the second cylindrical collar (6) by means of a connection bar. The screw rod (2) is in threaded connection with the vertex angle of the rhombic stretchable bracket (3) through which the screw rod passes. Pre-stress can be applied to the single prop with a constant resistance by applying a force by means of rotating a handle (1) and the screw rod (2) so as to increase or reduce the distance between opposite vertex angle points of the rhombic stretchable bracket (3), thus increasing or reducing the distance between the two cylindrical collars so as to achieve the objective of applying pre-stress to the single prop with a constant resistance. In addition, the device has a simple structure, is easy to operate, has good effects and is widely applicable.