An outer chain counterpart apparatus and method

The present invention discloses one kind of outer chain counterpart apparatus, comprising: a head end and a trailing end of the chain block, comprising a first chain and a second chain; disposed between the first chain and the second chain of at least three pressing member, the pressing member for pressing the pipe to be rotatable and capable of abutting on the periphery of the interface along the conduit; between the first chain and the second chain is provided with a predetermined size windowing; chain tensioning mechanism is connected to the group, the tensioning mechanism used for the outer chain counterpart device is mounted on the pipe to be docked, tensioning the chain block. The present invention is further based on the outer chain counterpart external device one kind of chain counterparts proposed method, by using the present invention, the outer chain counterpart apparatus and method can control the size and position of the flexible soldering space based on the size of pipe to be butt to increase the pipeline's effect counterparts.