Pipe end automatic shrinking and sizing device

Abstract

The invention discloses an automatic necking and sizing device for a tube end. The automatic necking and sizing device comprises a hydraulic oil cylinder, a mounting flange, a movable push plate, a slide block, an inner slide block sleeve, a sliding sleeve, a module and a clamp block, wherein the mounting flange is installed on the hydraulic oil cylinder, and a piston is arranged in the hydraulic oil cylinder; the movable push plate is connected with the piston rod of the piston; and the slide block is installed above the movable push plate. The slide block is sheathed in the sliding sleeve, the inner cavity of the sliding sleeve takes the shape of a frustum, and the outer surface of the slide block contacting with the sliding sleeve takes the shape of the frustum. Thus, the overlarge assembling clearance of the slide block and the sliding sleeve is effectively avoided, the axial movement in the machining process is avoided, and the machining quality is effectively ensured. The inner cavity section of the inner slide block sleeve and the slide block is ladder-shaped, so that the machining demands of steel tubes with different tube diameters are effectively met. The positioning is precise, and the precise positioning machining requirement is effectively met. During annular tube machining, the clearance between two tubes can be effectively removed, so that the two tubes are coaxially assembled.

Description

technical field [0001] The invention belongs to the technical field of shrinking and sizing equipment for steel pipes, and in particular relates to an automatic sizing device for pipe ends. Background technique [0002] At present, in the process of pipeline processing, many pipe ports need to be shrinked and sized. In the prior art, a large thrust oil cylinder is generally used to push the mold axially, and the end of the steel pipe is squeezed by the mold to deform it. During the extrusion process, the pipe needs to be held by strong clamps and cannot move axially. Once the clamping force is insufficient, axial series movement will occur, and the deformation of the pipe end will not meet the requirements, and the pipe will be clamped. There will also be scratches on the holding part, and if the clamping force of the clamp is too large, there will be pinch marks on the clamped part of the pipe. [0003] When processing casing pipe, for example, in the process of heat insul...

AI Technical Summary

Problems solved by technology

During the extrusion process, the pipe needs to be held by strong clamps and cannot move axially. Once the clamping force is insufficient, axial series movement will occur, and the deformation of the pipe end will not meet the requirements, and the pipe will be clamped. There will be scratches on the clamping part, and if the clamping force of the clamp is too large, there will be pinch marks on the clamped part of the pipe

[0003] When processing casing pipe, for example, in the process of heat insulation pipe, the inner pipe and outer pipe need to be welded together, there is a gap after the two pipes are assembled, it is difficult to ensure the coaxiality of the inner and outer pipes manually during welding, However, the positioning efficiency of tooling is low, and it will affect the welding quality

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