CN208350244U - Apply the piezoelectric ceramics dynamic tensile stress sensor of pretightning force - Google Patents
Apply the piezoelectric ceramics dynamic tensile stress sensor of pretightning force Download PDFInfo
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- CN208350244U CN208350244U CN201820075847.XU CN201820075847U CN208350244U CN 208350244 U CN208350244 U CN 208350244U CN 201820075847 U CN201820075847 U CN 201820075847U CN 208350244 U CN208350244 U CN 208350244U
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Abstract
The utility model provides a kind of piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force, two force-transmitting block stackings are placed, the one side of one of force-transmitting block towards another force-transmitting block is equipped with groove, it is integrally placed in the groove after two pieces of billet clamping piezoelectric ceramic pieces, it is levelling to pass through silica gel between groove and billet, between billet and the surface of piezoelectric ceramic piece respectively；Piezoelectric ceramic piece is connected by conducting wire with BNC connector, and BNC connector connects data collection system；Charge is converted into voltage signal by data collection system, is compared and analyzed by the output signal with force snesor to realize the calibration to sensor.
Description
Technical field
The utility model relates to tensile stress sensors and its caliberating device that one kind can apply pretightning force, more particularly, to one
Kind applies the piezoelectric ceramics dynamic tensile stress sensor of pretightning force.
Background technique
Currently, the stress measurement of concrete component is mainly based upon resistance strain plate or string formula in field of civil engineering
Strain gauge, the stress level based on strain responses component surface and inside.Resistance strain plate is generally pasted in advance in bar list
It is lower to benefit from the service life for face.String formula strain gauge long service life, measurement result is stablized, but cost is high.
Utility model content
Technical problem underlying to be solved in the utility model is to provide a kind of piezoelectric ceramics dynamic drawing for applying pretightning force
Strain gauge, cheap, small in size, production process is simple, stability is good, and long service life simultaneously can be with concrete
It is preferably compatible.
In order to solve the above technical problems, the utility model provides a kind of piezoelectric ceramics dynamic drawing for applying pretightning force
Strain gauge, include: by epoxy resins insulation handle piezoelectric ceramic piece, two pieces as coagulation soil matrix encapsulation made of power transmissions
Block, two pieces of billets, pretightning force screw rod；
Described two force-transmitting block stackings are placed, and the one side of one of force-transmitting block towards another force-transmitting block is equipped with groove,
It is integrally placed in the groove after two pieces of billets clamping piezoelectric ceramic piece, between the groove and billet, billet
It is levelling by silica gel respectively between the surface of piezoelectric ceramic piece；Two pieces of force-transmitting blocks run through four spiral shells along thickness direction
Bar, the screw rod is symmetrical along the center axis rotation of force-transmitting block, and applies pretightning force to force-transmitting block；
That opposite face of described two force-transmitting blocks is encapsulated by epoxy resin, and the piezoelectric ceramic piece passes through conducting wire and BNC
Connector connection, the BNC connector connect data collection system；
Under the effect of external force, the positive and negative charge of piezoelectric ceramic piece will move the piezoelectric ceramic piece along polarization direction,
Charge is converted into voltage signal by data collection system, is compared and analyzed by the output signal with force snesor to realize
Calibration to sensor.
In a preferred embodiment: the shape of the force-transmitting block is cuboid or prism or cylindrical body.
In a preferred embodiment: the force-transmitting block is encapsulated by the high-strength castable of ungauged regions self-flowing dense cement base.
Compared to the prior art, the technical solution of the utility model have it is following the utility model has the advantages that
A kind of piezoelectric ceramics dynamic tensile stress sensor applying pretightning force provided by the utility model, structure type letter
It is single, small in size, easy to make, and compared with the string formula strain gauge being widely used at present, it is cheap, it is suitable for mass production,
Largely reduce the stress monitoring cost of concrete structure.
It is provided by the utility model it is a kind of apply pretightning force piezoelectric ceramics dynamic tensile stress sensor, wherein force-transmitting block and
Built-in billet not only ensures effective transmitting of stress in sensor use process, and during pretightning force applies really
Protect the important guarantee of piezoelectric ceramic piece uniform force.In order to reduce the piezoelectricity after concrete force-transmitting block rough surface and insulation processing
The influence of potsherd crator between local out-of-flatness, piezoelectric ceramic piece and conducting wire after hardening, between billet and potsherd, steel
Backing plate carries out levelling with 704 silica gel that concrete force-transmitting block uniformly smears certain thickness (>=0.55mm).
Detailed description of the invention
Fig. 1 is the piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force in the preferred embodiment in the utility model, assembling
Overall structure diagram afterwards.
Fig. 2 (a) and Fig. 2 (b) is piezoelectric ceramics operation principle schematic diagram in the preferred embodiment in the utility model.
Fig. 3 (a) and Fig. 3 (b) is the production mold of force-transmitting block in the preferred embodiment in the utility model.
Fig. 4 is the schematic diagram of counterforce device of dropping hammer in the preferred embodiment in the utility model.
Specific embodiment
The production of sensor, pretightning force applying method, rating test device in the utility model are made below in conjunction with picture
The explanation of system.
As shown in Figure 1, a kind of piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force, comprising: pass through epoxy resin
5, two pieces of 8,11, two pieces of force-transmitting block billets 3,7, four as made of the encapsulation of coagulation soil matrix of piezoelectric ceramic piece of insulation processing are pre-
Clamp force screw rod 1 and matched nut 12；
Described two stackings of force-transmitting block 8,11 are placed, and one of force-transmitting block 8 is set on one side towards another force-transmitting block 11
Fluted, two pieces of billets 3,7 are integrally placed in the groove after clamping piezoelectric ceramic piece 5, the groove and billet 3
Between, it is levelling by silica gel 4,6 respectively between billet 3,7 and the surface of piezoelectric ceramic piece 5；Two pieces of force-transmitting blocks 8,11 edges
Thickness direction run through four screw rods 1, the screw rod 1 is symmetrical along the center axis rotation of force-transmitting block 8,11, and by falling
12 pairs of force-transmitting blocks of curtain apply pretightning force；The position of adjusting nut 12 can change the size of pretightning force.
That opposite face of described two force-transmitting blocks 8,11 is encapsulated by epoxy resin, and the piezoelectric ceramic piece is led by shielding
Line 9 and BNC connector 10 connect, and the BNC connector 10 connects data collection system；
As described in Figure 2, the working principle of the piezoelectric ceramics dynamic tensile stress sensor of above-mentioned application pretightning force is: described
Under the effect of external force, the positive and negative charge of piezoelectric ceramic piece 5 will move piezoelectric ceramic piece 5 along polarization direction, thus with pole
Change two vertical surfaces of direction and generates positive and negative bound charge, in the normal range of operation of piezoelectric ceramics, charge density and outer
The size of power correlation in direct ratio.Charge is converted into voltage signal by data collection system, by defeated with force snesor
Signal is compared and analyzed to realize the calibration to sensor out.
The piezoelectric ceramics dynamic tensile stress sensor interface of above-mentioned application pretightning force is levelling using silica-gel coating progress,
Structure type is simple, small in size, easy to make, and compared with the string formula strain gauge being widely used at present, cheap, is suitable for batch
Quantization production, largely reduces the stress monitoring cost of concrete structure.
Further, since force-transmitting block 8,11 and built-in billet 3,7, not only ensure stress in sensor use process
It effectively transmits, and ensures the important guarantee of 5 uniform force of piezoelectric ceramic piece during pretightning force applies.In order to reduce coagulation
The local out-of-flatness after hardening of piezoelectric ceramic piece 5 after native force-transmitting block 8,11 rough surface and insulation processing, piezoelectric ceramic piece 5 with
The influence of crator between conducting wire 9, between billet 3,7 and piezoelectric ceramic piece 5, billet piezoelectric ceramic piece 5 and concrete pass
The 704 silica gel progress that certain thickness (>=0.55mm) is uniformly smeared between power block 8 is levelling, under can acting in this way to avoid pretightning force
Stress concentrate.
In two opposite one sides of force-transmitting block 8,11 by forming bonding after smearing mixed with the epoxy resin of concrete dry powder
Layer 2, enable to 4 screw rods uniformly, be symmetrically loaded pretightning force.
The raw material of concrete force-transmitting block 8 and 11 can carry out appropriate adjustment according to the material of detected object, and machine can be used
Stone material, fibre reinforced concrete material or other synthetic materials after tool finishing etc..In order to guarantee that sensor makes
With stability in the process and reliability.The intensity of concrete force-transmitting block should be greater than the stress level for being detected component.
As shown in figure 3, the utility model devises two since the structural differences of force-transmitting block 8 and force-transmitting block 11 are larger
Set is respectively suitable for the mold of force-transmitting block 8 and force-transmitting block 11.Mold 1 includes backplane level, screw rod positioning column 13, and PVC casing 14 should
Set template can once make 25 concrete force-transmitting blocks 8.The outer profile size of each force-transmitting block is 30mm × 30mm × 10mm.With
Mold 1 is different, groove is formed after demoulding for force-transmitting block 11 to arrange piezoelectric ceramic piece 5, billet 3 and 7, layer of silica gel 4 and 6 and
Shielded wire 9, the middle setting corresponding protrusion in 15,16 and 17 as shown in the figure on the bottom plate of mold 2.Flow automatically in ungauged regions close
Before the real high-strength castable of cement base enters mould, mold 1 and 2 should be cleaned and uniform coating lubricating oil, and determined in pretightning force bolt
PVC casing 14 is installed on the column of position.It, can be high-strength by ungauged regions self-flowing dense cement base on PVC casing 14 after coating lubricating oil
Castable enters mould, vibrates, and top surface is levelling.It is collapsible die after curing box Plays conserve 24 hours.Concrete after demoulding passes
Power block 8 and 11 is put into after conserving 14 days in warm water under room temperature and air-dries.
The assembling of the piezoelectric ceramics dynamic tensile stress sensor of above-mentioned application pretightning force and pretightning force applying method: first
Piezoelectric ceramic piece 5 is attached with shielded wire 9, BNC connector 10 in the method for soldering, and with epoxy resin to piezoelectric ceramics
Piece 5 carries out waterproof insulation process.Then the surface of the concrete force-transmitting block 8 after air-drying and force-transmitting block 11, billet 3 and 7 is adopted
With absolute alcohol wiped clean, silica gel is uniformly smeared between billet 3,7 and piezoelectric ceramic piece 5, stands 24 hours, production
Process guarantees the plane keeping parallelism of two billets 3,7.
It uniformly smears epoxy resin in the groove in force-transmitting block 8 in next step, and billet 3,7, piezoelectric ceramic piece 5 is pacified
It sets in a groove, uniformly smears epoxy resin in adhesive layer 2.Finally 4 screw rods 1 are penetrated in force-transmitting block 8 and force-transmitting block 11
Pre-manufactured hole in, symmetrically tighten corresponding bolt.One layer of epoxy resin is uniformly finally smeared in the outer surface of sensor,
Stand 24 hours.
Referring to Fig. 4, the scaling method of the piezoelectric ceramics dynamic tensile stress sensor of above-mentioned application pretightning force, using dropping hammer
Counterforce device carries out the calibration of tensile stress,
The counterforce device that drops hammer includes a bracket 21, and the bottom of the bracket 21 is bottom plate 30；
The piezoelectric ceramics dynamic tensile stress sensor 28 of the application pretightning force to be calibrated pastes the bottom plate in bracket 21
On 30, the top surface of the piezoelectric ceramics dynamic tensile stress sensor 28 of application pretightning force to be calibrated is connected with a bloom 27；Steel
Block 27 is connected by steel strand wires 23 with tension sensor 26；The piezoelectric ceramics of tension sensor 26 and application pretightning force to be calibrated
The signal of dynamic tensile stress sensor 28 passes through shielded wire 31,29 respectively and is received by signal collecting device 32, eventually by
Data connecting line 33 is connected with terminal 34；When necessary, charge can be added according to the function of the 32 of signal collecting device to put
Big device.
The top of the bracket 21 is crossbeam 18, and an angle pulley 19 is fixedly connected with crossbeam 18, it is described drop hammer 22 company
Splicing 23 is connected with the tension sensor 26 far from the one side of steel strand wires after passing through angle pulley 19.
For the transient state tensile stress generated after 22 free-fallings that guarantees to drop hammer position perpendicular to the upper of piezoelectric transducer 26
Top surface arranges two limiting devices 24,25 on the bracket；The connecting rope 23 pass through limiting device 24,25 after with the drawing
The upper surface of force snesor 26 keeps vertical.
In order to further increase drop hammer 22 positioning accuracy, the scale mark of response is set on the stent 21.The quarter of two sides
Scale designation determine to drop hammer after being connected by horizontal rope with positioning bolt 20 22 height of drop.
Specific demarcating steps are:
1) the piezoelectric ceramics dynamic tensile stress sensor 28 of application pretightning force to be calibrated is placed in the counterforce device that drops hammer
On bottom plate 30；
2) connecting rope 23 dropped hammer is cut, 22 free-fallings of dropping hammer are made；Pass through the dynamic of 22 movement of falling objects generation of dropping hammer
The diverted pulley 19 of energy is converted into pulse pulling force, piezoelectric ceramics of the pulse pulling force effect line perpendicular to application pretightning force to be calibrated
The top surface of dynamic tensile stress sensor 28, data collection system record tension sensor 26 simultaneously and apply the piezoelectricity pottery of pretightning force
The signal of porcelain dynamic tensile stress sensor 28 realizes the calibration to sensor by data analysis.
When formal calibration, 22 quality of dropping hammer is 5kg, and every group of test should be at least repeated 5 times.Matter should be used before formal calibration
Amount is that dropping hammer for 1kg 22 carries out preloading test, to eliminate the error in each component assembling process.By to tensile stress sensor
With the signal analysis for the piezoelectric ceramics dynamic tensile stress sensor 28 for applying pretightning force, realize to the piezoelectric ceramics for applying pretightning force
The calibration of dynamic tensile stress sensor.
The utility model device is simple, and processing and fabricating is convenient.The application of pretightning force can reduce to the full extent sensor and exist
The formation probability of the defects of manufacturing process incipient bubble, hole, largely improves the survival rate of sensor.Due to excluding
The influence of initial imperfection, the linearity of sensor will have biggish promotion.The caliberating device of design is determined by effective
Position and limiting device, ensure that the Accurate Calibration to piezoelectric transducer.The utility model is suitable for mass production, can be widely applied to
In the concrete stress levels monitoring of civil engineering structure and long-term monitoring.
The foregoing is merely the utility model preferred embodiment, the technical scope of therefore, it cannot be limited according to the utility model,
Therefore it is all according to equivalent changes and modifications made by the technical essence of the utility model and description, the utility model skill should all be belonged to
In the range of art scheme.
Claims (3)
1. a kind of piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force, it is characterised in that include: exhausted by epoxy resin
The piezoelectric ceramic piece of edge processing, two pieces of force-transmitting blocks, two pieces of billets, pretightning force screw rod as made of the encapsulation of coagulation soil matrix；
Described two force-transmitting block stackings are placed, and the one side of one of force-transmitting block towards another force-transmitting block is equipped with groove, described
It is integrally placed in the groove after two pieces of billets clamping piezoelectric ceramic pieces, between the groove and billet, billet and pressure
It is levelling by silica gel respectively between the surface of electroceramics piece；Two pieces of force-transmitting blocks run through four screw rods, institute along thickness direction
It is symmetrical along the center axis rotation of force-transmitting block to state screw rod, and pretightning force is applied to force-transmitting block；
That opposite face of described two force-transmitting blocks is encapsulated by epoxy resin, and the piezoelectric ceramic piece passes through conducting wire and BNC connector
Connection, the BNC connector connect data collection system；
Under the effect of external force, the positive and negative charge of piezoelectric ceramic piece will move the piezoelectric ceramic piece along polarization direction, charge
It is converted into voltage signal by data collection system, is compared and analyzed by the output signal with force snesor to realize to biography
The calibration of sensor.
2. a kind of piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force as described in claim 1, it is characterised in that: institute
The shape for stating force-transmitting block is cuboid or prism or cylindrical body.
3. a kind of piezoelectric ceramics dynamic tensile stress sensor for applying pretightning force as described in claim 1, it is characterised in that: institute
Force-transmitting block is stated to be encapsulated by the high-strength castable of ungauged regions self-flowing dense cement base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820075847.XU CN208350244U (en) | 2018-01-17 | 2018-01-17 | Apply the piezoelectric ceramics dynamic tensile stress sensor of pretightning force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820075847.XU CN208350244U (en) | 2018-01-17 | 2018-01-17 | Apply the piezoelectric ceramics dynamic tensile stress sensor of pretightning force |
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| CN208350244U true CN208350244U (en) | 2019-01-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991006A (en) * | 2018-01-17 | 2018-05-04 | 华侨大学 | Apply the piezoelectric ceramics dynamic tension sensor and its scaling method of pretightning force |
| CN113432773A (en) * | 2021-06-17 | 2021-09-24 | 中北大学 | Sensor suitable for measuring surface shock wave pressure of flexible object and manufacturing method |
-
2018
- 2018-01-17 CN CN201820075847.XU patent/CN208350244U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991006A (en) * | 2018-01-17 | 2018-05-04 | 华侨大学 | Apply the piezoelectric ceramics dynamic tension sensor and its scaling method of pretightning force |
| CN107991006B (en) * | 2018-01-17 | 2024-02-13 | 华侨大学 | Piezoelectric ceramic dynamic tension stress sensor applying pretightening force and calibration method thereof |
| CN113432773A (en) * | 2021-06-17 | 2021-09-24 | 中北大学 | Sensor suitable for measuring surface shock wave pressure of flexible object and manufacturing method |
| CN113432773B (en) * | 2021-06-17 | 2023-10-27 | 中北大学 | Sensor suitable for measuring pressure of shock wave on surface of flexible object and manufacturing method |
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