The utility model relates to a nervous heat -setting machine overhauls equipment field, specific be used for rotary joint and specialized tool of coping is carried out to mounting groove bottom surface thereof that says so. Including the coping of the tube -shape body, the one end of the coping body be coping portion, all is equipped with the coping layer on the outer periphery of this tip of thecoping body and terminal surface, and the other end of the coping body be connecting portion, is equipped with the connecting rod at this tip endotheca of the coping body, and connecting rod and coping are personally experienced sth. Part of the body can dismantle fixed connection through the bolt, keeps away from one end that the coping personally experienced sth. Part of the body and be equippedwith and be used for the prism fixed with the electric hand drill chuck on the connecting rod. The utility model discloses simple structure easily realizes, small in size be applicable to the site environment of narrow complicacy, thereby the rotatory mounting groove to rotary joint of accessible electric hand drill drive carries out on -the -spot coping. Reduce the downtime maintenance time by awide margin, improved maintenance efficiency, practiced thrift maintenance and accessory fund, but wide application in trades such as petrochemical industry, weaving, metallurgy.