A high-strength screw

Abstract

The invention discloses a high-strength screw. A screw body is included. Threads are arranged on the surface of the screw body and include the high threads, the medium thread and the low thread. The medium thread and the low thread are sequentially arranged between the two high thread sections. The high threads and the medium thread are provided with notches. The low thread is provided with a protruding block, and the height of the protruding block is smaller than the height difference of the medium thread and the low thread. According to the high-strength screw, the surface of the screw bodyis provided with the high threads, the medium thread and the low thread, so that the situation that materials make direct contact with the screw body, and a rod body is damaged or fractured is avoided; and meanwhile, the high-strength screw is made of high-strength materials, the strength of the screw is further improved, and the problem of screw fracture due to abrasion is solved.

Description

technical field [0001] The invention relates to the field of automation equipment, in particular to a high-strength screw. Background technique [0002] In the traditional plastic extruder industry, the extrusion screw generally requires nitriding treatment, or a layer of hard chrome alloy is plated on the surface of the screw to improve the strength of the screw. However, this kind of processing method does not solve the wear-resistant problem of the screw, and the scope of application is not targeted. For some abrasive and corrosive plastics, it may not be possible to take into account both aspects, which will cause waste of raw materials, increase production costs, The poor problem of using effect, the hardness problem of screw rod also can't satisfy the requirement of the plastic material that develops day by day. [0003] The invention patent with the Chinese patent number CN201510199952.5 discloses a high-strength hollow screw, which includes a screw, and the inside o...

AI Technical Summary

Problems solved by technology

However, this kind of processing method does not solve the wear-resistant problem of the screw, and the scope of application is not targeted. For some abrasive and corrosive plastics, it may not be possible to take into account both aspects, which will cause waste of raw materials, increase production costs, The problem of poor use effect, the hardness of the screw can not meet the requirements of the growing plastic materials

[0003] The invention patent with the Chinese patent number CN201510199952.5 discloses a high-strength hollow screw, which includes a screw, and the inside of the screw is provided with a perforation centered on the center line, and a layer of graphene coating is provided on the surface of the screw and the thread , there is a layer of graphene covering layer on the surface of the screw. Because the graphene covering layer has the characteristics of high hardness and high temperature resistance, it effectively solves the problem that some materials with strong abrasiveness and corrosion may not be able to take into account both aspects, resulting in the use of The problem is that the effect is poor, but the above-mentioned screw is only coated with a graphene coating on the surface of the screw to reduce its wear, and the strength of the screw has not been enhanced. When it acts on some high-strength materials, the screw will be damaged or broken.

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