The invention belongs to the technical field of pipeline
machining, and discloses a thick-wall pipeline
welding junction chamfering beveling
machine which comprises a supporting mechanism, a mounting mechanism, a control mechanism, a beveling mechanism and a fixing mechanism. According to the device, through cooperation of the mounting mechanism, the beveling mechanism and the fixing mechanism, after the thick pipeline is fixed to a supporting plate of the sliding frame, the fixing mechanism in the folded state extends into the thick pipeline, then a liquid pump is started, hydraulic oil is injected into a multi-stage cylinder and a telescopic rod, and then the thick pipeline is fixed to the sliding frame; and then the thick pipeline is fixed relative to the mounting mechanism under the cooperation of a supporting block and a telescopic rod, so that the situation that when the thick pipeline is
cut by the beveling cutter, the thick pipeline shakes, and consequently the shape of a groove is poor is prevented, meanwhile, after the supporting frame supports the thick pipeline from the interior, the axis of the middle ring automatically coincides with the axis of the thick pipeline, and the
machining precision is improved. Therefore, it is ensured that the moving seat rotates around the axis of the thick pipeline, the forming effect of the groove is ensured, and the situation that
welding cannot be conducted due to deviation of the groove is prevented.