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Protector for inner thread in petroleum steel pipe and its making process

A technology of petroleum steel pipe and internal thread, which is applied in the field of petroleum steel pipe internal thread protector and its preparation, can solve the problems of weakening the impact resistance of the protector, poor impact resistance of the plastic layer, and failure to achieve the protection effect, and achieves low price, anti-corrosion Good impact performance and reasonable structure

Inactive Publication Date: 2007-11-07
杨泽景
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Problems solved by technology

There is a hollow core between the plastic layer and the steel plate layer, and there are only a few connection points, so that the two layers are easy to fall off during use or transportation, loading and unloading, and the plastic layer has poor impact resistance and is easy to break, which weakens the protector impact resistance, so it can not achieve a good protection effect

Method used

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  • Protector for inner thread in petroleum steel pipe and its making process

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:

[0031] Figure 1 shows a front view of the present invention with a half section view. It can be seen from the figure that the oil steel pipe internal thread protector of this embodiment includes an annular rigid frame 1 and a plastic outer layer 2 coated on the outside of the frame, and a core layer is arranged between the rigid frame 1 and the plastic outer layer 2 3. The core layer 3 described in this embodiment is a plastic layer made of recycled plastic injection-molded on the outer surface of the rigid frame 1 , and the inner and outer surfaces of the core layer 3 are closely combined with the rigid frame 1 and the plastic outer layer 2 respectively. The outer surface of the plastic outer layer 2 is provided with threads 4 . The top of the rigid framework 1 rolls outwards to form an annular eaves 5, the upper end of the plastic outer layer 2 protrud...

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Abstract

The present invention discloses one kind of protector for inner thread in petroleum steel pipe and its making process. The protector includes one ring rigid skeleton, one plastic outer layer with bottom and outside the skeleton, and one core layer in between. It is made through the steps of making ring rigid skeleton, injection molding the core layer outside the rigid skeleton, and injection molding outer plastic layer. The present invention has the advantages of high impact resistance, capacity of matching with the inner thread in protected pipe for effective protection, simple making process, low cost, capacity of being reused, etc.

Description

technical field [0001] The invention relates to a pipeline thread protector, in particular to an oil steel pipe internal thread protector and a preparation method thereof. Background technique [0002] Existing thread protectors used for oil casing or various pipeline ends mainly include all-steel, all-plastic and steel-plastic composite structures. The thread protector with all-steel structure, because its thread part has not been flexibly treated, will easily damage the thread at the end of the pipe in case of excessive external impact during transportation or disassembly; the thread protector with all-plastic structure, due to The strength is poor. During transportation or disassembly, if there is an excessive external impact force, it is easy to weaken its protective effect on the pipeline due to its own deformation. In order to overcome these defects, relevant personnel have developed a steel-plastic combination thread protector, which is mainly composed of a steel rin...

Claims

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Application Information

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IPC IPC(8): B65D59/00B29C45/14B23P15/00B29K23/00
Inventor 贾振祥杨泽景李玉杰
Owner 杨泽景
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