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Simple carbon fiber composite circular rod body joint

A composite material and carbon fiber technology, applied in the direction of drill pipe, drill pipe, casing, etc., can solve the problems of high comprehensive cost of supporting hardware products, unfavorable promotion and use of carbon fiber products, low consistency and uniformity, and achieve excellent tensile strength Tensile strength and elongation, extensive detachability, and low-cost effects

Active Publication Date: 2016-01-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing carbon fiber composite mandrel supporting metal tools all adopt the wire cutting process, which requires slow wire-feeding, internal grinding, and external grinding, and the whole process must be completed by a digital numerical control machining center. The sleeve is too long, the processing is difficult, the processing cycle is long, the labor cost is high, and the consistency and uniformity are not high
The overall cost of supporting fittings for this type of product is too high, which is not conducive to the promotion and use of carbon fiber products
[0004] Patent document CN99112384.0 discloses a flexible continuous flat-belt carbon fiber sucker rod and its joints, but it can only be applied to flat-band carbon fiber sucker rods and fixed by screw pins; the structure is complex and inconvenient to assemble and disassemble

Method used

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  • Simple carbon fiber composite circular rod body joint
  • Simple carbon fiber composite circular rod body joint
  • Simple carbon fiber composite circular rod body joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A simple carbon fiber composite material circular rod joint, the joint includes an inner cone 1, an outer cone 2, a sleeve 3, and a spring, and the outer wall of the inner cone 1 is wedged with the inner wall of the outer cone 2, The tail of the outer cone 2 is installed in the sleeve 3, the tail of the outer cone 2 is provided with a spring, and the head of the outer cone 2 is an inner cone structure; The rod 7 is set in the sleeve 3; when the joint is installed and the pulling force or pushing force on the carbon fiber mandrel 8 is less than 1600N, the carbon fiber mandrel 8 and the inner cone 1 are relatively stationary.

[0033] Compared with the existing fittings, the inner cone 1 and the outer cone 2 in the present invention are shorter in length, less difficult to process, and the cone surfaces fit well. Sleeve internal thread connection. The protective ring 4 and the multi-lobe structure 5 can be tightly combined with the composite material and reduce stress co...

Embodiment 2

[0035] The difference from Embodiment 1 is that the carbon fiber mandrel passes through a spring and engages with one end of the anchor rod. The carbon fiber mandrel is engaged by the card slot provided at one end of the anchor rod, which can further improve the stability of the connection. At the same time, the carbon fiber mandrel can realize the effective positioning of the spring and improve the bonding force between the parts of the joint. It is embedded at a depth of about 2-3mm, mainly for positioning. The carbon fiber mandrel can be moved from right to left, and then adjusted to insert the carbon fiber mandrel into the anchor rod, which is a solid structure.

Embodiment 3

[0037] The difference from Embodiment 1 is that the inner diameter of the spring is equal to the inner diameter of the tail of the inner cone. Ensure that the inner cone is evenly stressed, improve the tightness of the combination of the inner cone and the outer cone, and avoid the problem of uneven force on parts of the carbon fiber mandrel and easy breakage.

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PUM

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Abstract

The invention provides a simple carbon fiber composite circular rod body joint. The joint is composed of an internal cone, an external cone, a conical sleeve and a spring. The outer wall of the internal cone and the outer wall of the external cone are wedged, end surfaces of tail portions are flush, the tail portion of the external cone is installed in the conical sleeve, the tail portion of the external cone is provided with the spring, and the head portion of the external cone is of an internal conical structure. Reduction of the lengths of an internal conical sleeve and an external conical sleeve helps to improve the processing precision of an internal conical jacket surface and the consilience degree between an internal conical sleeve surface and an external conical sleeve surface, all the processes can be completed on general equipment, the processing procedures are simplified, and the processing difficulty and the cost are effectively reduced; protection rings at the two ends of the external conical sleeve can effectively protect a stress concentration portion between a compressed position and an uncompressed portion of a carbon fiber core rod so as to realize smooth transition of stress of the core rod; a multi-lobe structure can enable the external conical sleeve and the surface of a composite material to be closely attached, enables the stress to be uniform and improves the frictional force between the two so as to enable a hardware fitting to provide a sufficient holding force; and 4, the belleville spring is additionally arranged at the tail portion, such that the external conical sleeve can be effectively prevented from being loosened and rebounding from an internal conical jacket.

Description

technical field [0001] The invention relates to a carbon fiber composite material circular rod tension-resistant fitting, in particular to a simple carbon fiber composite material circular rod body joint. technical background [0002] Carbon fiber composite materials have excellent properties such as light weight, high strength, high specific modulus, corrosion resistance, aging resistance, and long life, and have been widely used in many fields in recent years. Among them, pultruded carbon fiber composite continuous round rods are being widely used in power transmission and oil extraction. Among them, carbon fiber wires have been hung on the net for thousands of kilometers. [0003] During the use of carbon fiber composite materials, they need to be connected with other structural parts and exert their excellent mechanical properties. Because of its special structural properties, it is not suitable for metal connection forms such as threaded, crimped, and welded, so it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02
Inventor 朱波王永伟乔琨赵圣尧高学平
Owner SHANDONG UNIV
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