CN206035999U - A intelligent nut device for $monitoring bolted connection situation - Google Patents
A intelligent nut device for $monitoring bolted connection situation Download PDFInfo
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- CN206035999U CN206035999U CN201621092857.1U CN201621092857U CN206035999U CN 206035999 U CN206035999 U CN 206035999U CN 201621092857 U CN201621092857 U CN 201621092857U CN 206035999 U CN206035999 U CN 206035999U
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- bolted connection
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- intelligent nut
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Abstract
The utility model belongs to the technical field of civil engineering and mechanical engineering's bolted connection state monitoring, a an intelligent nut device for $monitoring bolted connection situation is provided. Take place when not hard up when the bolted connection interface, supersound wave propagation route can be influenced, and these minor changes can be monitored to intelligent nut, through the transmit and receive signal, utilizes the change of the signal that received impedance signal and other test means obtained can guess the state of locating at the bolted connection interface conversely to connection status to the bolt and nut connecting piece is monitored. The simple and convenient feasible method that provides is monitored for bolted connection component in the engineering to this kind of intelligent nut based on piezoceramics.
Description
Technical field
This utility model is mainly used in civil engineering and mechanical bolt connection Condition Monitoring Technology field, specifically
Say, be when bolt connection interface occur loosen when, the propagation path of ultrasound wave can be affected, and intelligent nut can monitor these
Small change, by launching and receiving signal, the signal obtained using the impedance signal for receiving and other means of testing
Change can speculate bolt connection interface state in which in turn, so as to the connection status to bolt and nut connector is carried out
Monitoring.This intelligent nut based on piezoelectric ceramics provides a kind of simple and feasible side for bolt connecting elements monitoring in engineering
Method.
Background technology
In the structures such as modern large civil structure, such as LARGE SPAN STEEL BRIDGE, high-rise building and Large Transmission Tower, bolt
Used as a kind of important connected mode, its reliability is to ensure the basis of construction quality and structure normal service for connection.Therefore, its
The research of linkage interface damage monitoring is increasingly subject to people's attention.
Piezoelectric ceramics is used in many aspects as a kind of new intellectual material.The piezoelectric effect that it has is any pressure
The key property that electric material all has.In the case where certain temperature conditionss are met, when mechanically deform is applied to piezoelectric element,
Will cause internal positive and negative charge center that relative movement occurs and polarization a little is produced, so as to cause occur on two surfaces of element
The contrary bound charge of symbol, and charge density is proportional to external force, this phenomenon is referred to as direct piezoelectric effect.Conversely, in piezoelectricity
Applied voltage on two surfaces of element, due to the effect of electric field, causes positive and negative charge center inside piezoelectric element to produce relative position
Move, cause the deformation of piezoelectric element, i.e. inverse piezoelectric effect.This utility model exactly utilizes this malleation specific to piezoelectric ceramics
Electricity and inverse piezoelectric effect.
For with the detection of numerous bolt connection qualities, traditional monitoring will by it is artificial one by one remove monitoring bolt
Connection loosening situation, this monitoring not only waste time and energy but also for the detection of some special constructions also has certain risk.
Utility model content
In order to solve the above problems, this utility model provides a kind of intelligent nut for monitoring bolt connection status and fills
Put, the mock-up (such as Fig. 1) of intelligent nut device, the device are mainly made up of two parts, and a part is plain nut, another
Part is the internal ring protection shell for installing piezoelectric ceramics.
One of monitoring principle of intelligent nut is to utilize by the impedance operator of measurement piezoelectric patches to recognize.By piezoelectric ceramics
Vibration equation obtain, the conductance relevant with frequency is received shown in expression formula such as formula (1), wherein, la,wa, and haRespectively piezoelectricity is made pottery
The length of ceramics, width and thickness, d31It is piezoelectric strain constant,It is piezoelectric ceramics in the case of normal pressure stress
Complex dielectric permittivity.For complex modulus of the piezoceramic material under normal electric field conditions, δ and η difference tables
Show electrical dissipation factor and the mechanical loss factor of piezoelectric ceramics.ω、κ、ZaAngular frequency, wave number, piezoelectric ceramics is represented respectively with Z
Mechanical impedance and agent structure mechanical impedance.Fig. 1 is the mechanical system electromechanical Coupling Model with Piezoelectric Ceramic.
Except the impedance information using intelligent nut, other some monitoring methods such as actively monitoring energy balancing methods
It is equally applicable.
It should be noted that when bolt connection piece loosens, the interface of connection changes, the ultrasound of intelligent nut transmitting
Ripple signal paths traversed can also change, and cause the ultrasonic signal for receiving to change, can according to the signal change information for receiving
To judge bolt connection state in which.
A kind of intelligent nut device for monitoring bolt connection state, including nut 1, containment vessel 2, ring-shaped piezo ceramic
3rd, lead channels mouth 4, wire 5 and bolt 6；By 3 welding lead 5 of ring-shaped piezo ceramic, open inside containment vessel 2 one it is annular
Groove, ring-shaped piezo ceramic 3 is arranged in protector, adhering with epoxy resin is carried out therebetween and is filled up completely with to space, it is ensured that
The ripple totally tansitive that ring-shaped piezo ceramic 3 is produced, meanwhile, the wire 5 of the welding of ring-shaped piezo ceramic 3 is connected by lead channels mouth 4
It is connected to outside source.It is whether short-circuit with circuit tester monitoring intelligent bolt after epoxy resin is air-dried completely.
The beneficial effects of the utility model：
1st, the piezoelectric effect that this device has by piezoelectric ceramics, using the impedance information between piezoelectric ceramics and structure with
And actively monitoring method is monitored to bolt connection state, it is not necessary to which manual site detects, time saving and energy saving.And for bolt
Installation and integrally-built performance do not affect.
2nd, this device can be detected to structure in real time using various actively monitoring methods.
3rd, this utility model simple structure, part are less, make and installation process is simple, strong applicability, low cost and dimension
Shield is convenient, can effectively detect bolt connecting elements safe condition, with wide popularization market and application prospect.
Description of the drawings
Fig. 1 is a kind of intelligent nut device front view for monitoring bolt connection state.
Fig. 2 is a kind of intelligent nut device top view for monitoring bolt connection state.
In figure：1 nut；2 containment vessels；3 ring-shaped piezo ceramics；4 lead channels mouths；5 wires；6 bolts.
Specific embodiment
Below in conjunction with accompanying drawing and technical scheme, specific embodiment of the present utility model is further illustrated.
This utility model provides a kind of intelligent nut device for monitoring bolt connection status, and specific embodiment is such as
Under：
The nut 1 and containment vessel 2 of intelligent nut is made using same model Steel material, with stronger intensity and and one
Fixed toughness.Containment vessel 2 is made into a cannelure more slightly larger than 3 size of ring-shaped piezo ceramic, and in this containment vessel
Make a lead channels mouth 4 for connecting 3 both positive and negative polarity of annular piezoelectric ceramic piece in edge.Ring-shaped piezo ceramic 3 will enter in advance
Row is following to be processed：From thinner thickness, the piezoelectric ceramic piece of containment vessel annular notches is dimensioned slightly smaller than, on piezoelectric ceramics surface just
Negative pole welding lead.Welded wire 3 surface of ring-shaped piezo ceramic apply epoxy coating, apply epoxy resin be for
The insulating properties of the piezoelectric ceramics for ensureing weld wire, is installed in annular notches after epoxy resin is air-dried completely, installation
During also fill the gap between PZT ring-shaped piezo ceramics 3 and annular notches with epoxy resin, in order to carry out having for signal
Effect transmission and waterproofing protection.Treat that epoxy resin detects ring-shaped piezo ceramic both positive and negative polarity insulating properties with circuit tester after air-drying, absolutely
Edge is well installed on the outside of nut 1, is welded between the two or bonding.
In addition this intelligent nut device can do some changes depending on concrete condition, and which can change part mainly includes protective layer
The selection of some major parameters such as fluting shape and size, the geometric shape size of piezoelectric ceramic piece, piezoelectric ceramics model should
With being also exactly installation site and quantity of intelligent nut etc..
Claims (1)
1. a kind of intelligent nut device for monitoring bolt connection state, it is characterised in that the intelligent nut device includes spiral shell
Female (1), containment vessel (2), ring-shaped piezo ceramic (3), lead channels mouth (4), wire (5) and bolt (6)；By ring-shaped piezo ceramic
(3) welding lead (5), drive a cannelure inside containment vessel (2), ring-shaped piezo ceramic (3) are arranged in protector, two
Carry out adhering with epoxy resin to be filled up completely with to space between person, it is ensured that the ripple totally tansitive that ring-shaped piezo ceramic (3) is produced, together
When, the wire 5 of the welding of ring-shaped piezo ceramic 3 is connected to outside source by lead channels mouth (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621092857.1U CN206035999U (en) | 2016-09-29 | 2016-09-29 | A intelligent nut device for $monitoring bolted connection situation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621092857.1U CN206035999U (en) | 2016-09-29 | 2016-09-29 | A intelligent nut device for $monitoring bolted connection situation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206035999U true CN206035999U (en) | 2017-03-22 |
Family
ID=58297160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621092857.1U Active CN206035999U (en) | 2016-09-29 | 2016-09-29 | A intelligent nut device for $monitoring bolted connection situation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206035999U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106286550A (en) * | 2016-09-29 | 2017-01-04 | 大连理工大学 | A kind of intelligent nut device for monitoring bolt connection state |
| CN107859683A (en) * | 2017-08-11 | 2018-03-30 | 清远市德晟嘉恒能源环保工程有限责任公司 | A kind of conductivity ceramics construction of switch |
-
2016
- 2016-09-29 CN CN201621092857.1U patent/CN206035999U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106286550A (en) * | 2016-09-29 | 2017-01-04 | 大连理工大学 | A kind of intelligent nut device for monitoring bolt connection state |
| CN107859683A (en) * | 2017-08-11 | 2018-03-30 | 清远市德晟嘉恒能源环保工程有限责任公司 | A kind of conductivity ceramics construction of switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |