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A throat hoop type shape memory alloy fastener

A memory alloy and fastener technology, which is applied in the field of shape memory alloy fasteners and throat hoop type shape memory alloy fasteners, can solve problems such as lack, and achieve high fastening force value, high restoring force value, The effect of excellent corrosion resistance

Active Publication Date: 2020-10-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a throat hoop-type shape memory alloy fastener, which is used to solve the problems in the prior art that do not require holes, have high fastening force, are safe and reliable, The problem of fasteners with simple structure, convenient operation, wide application range, and suitable for flexible and hard pipe connection applications of any diameter

Method used

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  • A throat hoop type shape memory alloy fastener
  • A throat hoop type shape memory alloy fastener
  • A throat hoop type shape memory alloy fastener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] According to the required fastening object - soft and hard pipe, the actual use effect observation is carried out. The selected plastic hard pipe is a fastening object of standard size, its outer diameter is 20mm, and the wall thickness of the plastic hose is 0.8mm. After the hard tube is installed on the hose jacket, the wall thickness of the hose is slightly reduced. The outer diameter of the joint of the soft and hard tube is about 21.2mm, and its circumference is about 66.5mm.

[0072] Choose matching fasteners with shape memory hoops. The material of the hoops is titanium-nickel alloy, which is 44% titanium and 56% nickel by mass percentage, and the reverse phase transition temperature is 40°C. The hoop was subjected to stress aging treatment, aged at 350°C for 4 hours at a medium temperature, and a stress of 400 MPa was applied in a direction parallel to the ring shape of the hoop at the same time. The thickness of the hoop is 0.5mm, the width is 3mm, and the ini...

Embodiment 2

[0075] According to the required fastening object - soft and hard pipe, the actual use effect observation is carried out. The selected plastic hard pipe is the fastening object of standard size, and the fastener with the shape memory effect hoop matching the fastening object-soft and hard pipe is selected. The hoop material is titanium-nickel alloy, which is calculated by mass percentage , 44% titanium, 56% nickel, and its inverse phase transition temperature is 40°C. The hoop was subjected to stress aging treatment, aged at 300°C for 5 hours at a medium temperature, and a stress of 500 MPa was applied in the direction parallel to the ring shape of the hoop at the same time. Both ends of the hoop are fixed by welding. First, the hoop is pre-stretched with a stretch ratio of 5%. After unloading, it is slightly larger than the outer diameter circumference of the joint of the soft and hard pipe. Then, put the ferrule on the connection between the soft and hard pipes. Finally, ...

Embodiment 3

[0078] According to the required fastening object - soft and hard pipe, the actual use effect observation is carried out. The selected plastic hard pipe is the fastening object of non-standard size, and the fastener with the shape memory effect hoop matching the fastening object-soft and hard pipe is selected. The hoop material is made of shape memory alloy and high elastic plastic The composite material is formed by wrapping the shape memory alloy with highly elastic plastic, and the shape memory alloy is an iron-nickel-cobalt-titanium alloy, and its mass percentage is 55% iron; 31% nickel; 10% cobalt; and 4% titanium. The hoop is subjected to stress aging treatment, aged at 400°C for 3 hours at a medium temperature, and a stress of 300 MPa is applied in a direction parallel to the ring shape of the hoop at the same time. The hoop is secured with a snap-on fastening. First, the hoop is pre-stretched with a stretch ratio of 9%. After unloading, it is slightly larger than the ...

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Abstract

The invention provides a throat hoop type shape memory alloy fastener, comprising at least one hoop and fixing blocks connecting the two ends of the hoop, the hoop is made of a material with shape memory effect and the hoop is mounted on There is no card hole. The present invention further provides a method for preparing and using a throat hoop type shape memory alloy fastener. The present invention provides a throat hoop-type shape memory alloy fastener, with the help of the ultra-high recoverable strain, high recovery force value and excellent corrosion resistance of the shape memory alloy, through pre-stretching expansion and heat-induced compression recovery Two steps are used to achieve the fastening of soft and hard pipes. It is not only safe and reliable, but also simple in structure and easy to operate. At the same time, it has a wide range of applications and is suitable for the connection of soft and hard pipes of any diameter.

Description

technical field [0001] The invention belongs to the technical field of connectors, and relates to a shape memory alloy fastener, in particular to a throat hoop type shape memory alloy fastener and a use method thereof. Background technique [0002] Hose clamps (hose clamps), also known as clamps, are fasteners used to connect soft and hard pipes, and are widely used in many fields such as automobiles, tractors, forklifts, locomotives, ships, mines, petroleum, chemical industry, pharmaceuticals, agriculture, etc. , is an ideal connecting fastener. The traditionally used stainless steel hose clamp adopts the through-hole process, which needs to have the characteristics of wide application range, torsional pressure resistance, torsional torque balance, etc., to meet the requirements of firm and tight locking. [0003] In the application of soft and hard pipe connection, there are also some inconveniences. The throat clamp usually adopts an open inner and outer ring structure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B1/00
CPCF16B2200/77
Inventor 金明江左舜贵金学军
Owner SHANGHAI JIAO TONG UNIV
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