HLL type elastic column pin coupling is a column pin made of a number of non-metallic elastic materials, placed in the flange hole of the two halves of the coupling, through the column pin to achieve the two halves of the coupling connection, the coupling structure is simple, easy to manufacture, easy to assemble and dismantle the elastic components, do not move the two coupling. The material of the elastic element (column pin) is generally nylon 6, which has the ability to offset two axes with trace compensation. The elastic part is subject to shearing when working, and its working reliability is extremely poor. It is only suitable for the medium speed transmission shaft system with low requirements, and is not suitable for the working condition with high reliability requirements. The shear strength and the extrusion strength of the pin and the hole wall of the pin are calculated on the cross section of the elastic pin.