Two-section type screw screwing-off structure

Abstract

The invention discloses a two-section type screw screwing-off structure. The structure comprises a lower die core installed in the center of a lower die plate, and a lower die cavity used for forming a pipe joint is machined in the lower die core; each of the two sides of the lower die core is provided with a sliding block device in a sliding mode, threaded cores are rotationally clamped on the sliding block devices, the sliding block devices are extruded by an upper die plate to drive the threaded cores to move forwards to the forming position of the inner threads of the pipe opening of the pipe joint during die assembly, the rear ends of the threaded cores are sleeved with rotating shafts used for driving the threaded cores to rotate, and the rotating shafts are connected with driving mechanisms; a reset spring connected with the lower die core in an abutting mode is sleeved with each sliding block device, the reset springs elastically push the sliding block devices to pull the threaded cores to move backwards relative to the rotating shafts for demolding while the threaded cores rotate after mold opening, and an ejection mechanism used for ejecting the pipe joint out of the lower die cavity is arranged below the lower die plate. The structure is simple, high in stability and capable of effectively preventing the threads from being strained, reducing die core abrasion, and prolonging the service life of the die.

Description

technical field [0001] The invention relates to the technical field of molds, in particular to a spin-off structure used in molds, specifically a two-stage screw spin-off structure. Background technique [0002] In the prior art, for the mold for forming cross-shaped pipe joints, since the left and right ends of this pipe joint product are threaded holes, when the upper and lower formworks need to be core-pulled after mold opening, if there is a slight carelessness , The threaded core used to form the threaded hole will strain the threaded hole, and the improper core pulling will easily cause the wear of the mold core, so it is necessary to innovate its structure. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a two-stage screw unscrewing structure in view of the current situation of the above-mentioned prior art. The structure design is reasonable, which can effectively prevent thread strain, reduce mold core w...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, for the mold for forming cross-shaped pipe joints, since the left and right ends of this pipe joint product are threaded holes, when the upper and lower formworks need to be core-pulled after mold opening, if there is a slight carelessness , the threaded core used to form the threaded hole will strain the threaded hole, and improper core pulling will easily cause the wear of the mold core, so it is necessary to innovate its structure

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