CN209542647U - Modified tri-shear standard acceler - Google Patents
Modified tri-shear standard acceler Download PDFInfo
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- CN209542647U CN209542647U CN201920240048.8U CN201920240048U CN209542647U CN 209542647 U CN209542647 U CN 209542647U CN 201920240048 U CN201920240048 U CN 201920240048U CN 209542647 U CN209542647 U CN 209542647U
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Abstract
The utility model discloses a kind of modified tri-shear standard accelers, belong to sensor technical field, solve that conventional acceleration sensor accuracy class is poor, same batch products property difference is big, sensitivity consistency is poor, the problem of product stability difference, it include mainly pedestal, clamshell, regular triangular prism, piezoelectric element group, which includes multiple piezoelectric elements stacked gradually, and piezoelectric element includes two panels piezoelectric patches and conductive sheet.The utility model measurement accuracy is high, and stacked structure design can make quartz shearing piece internal stress be superimposed gap location with layer in layer to be released；Load capacity is big, has good buffer action to non-vibration interference signal, transient temperature influence；Properties of product are stablized, and the sensitivity degree of consistency is high, and it is the trustworthy standard transducer for being engaged in the units such as vibration-testing, calibration and calibrating that assembly technology, which simplifies,.
Description
Technical field
The utility model belongs to sensor technical field, specifically, more particularly to a kind of load capacity is strong, measurement accuracy
High, properties of product stabilization, structure manufacture and design easy modified tri-shear standard acceler.
Background technique
The calibration of sensor is also referred to as demarcated, it is to establish the pass between the input quantity of sensor and output quantity by test
System, while also determining the error relationship under different use conditions.Various kinds of sensors used in vibration measurement, its items
Energy index such as sensitivity, the linearity, frequency response characteristic etc., precision and reliability to measurement data directly have an impact.Cause
This, in order to guarantee the correctness and uniformity of result, according to national metrological verification regulations (JJG134-2003, JJG297-1997,
JJG233-2008), it is necessary to periodically sensor be calibrated, general calibration cycle is 1 year.Standard acceler is also answered
It transports and gives birth to, standard acceler is mainly used for " comparison method " calibration of vibrating sensor.Commonplace mark is used at present
Quasi- sensor is the 2270 of 8305 and ENDEVCO company, the U.S. of Denmark BK company.8305 and U.S. ENDEVCO of BK company is public
The structure type of 2270 this two standard transducer of department is central compressed type, the normal acceleration of domestic some producer's productions
Sensor is mostly also using centre mounted compression constitution.
This structure can bring some problems: 1) according to piezoelectric accelerometer national measurement inspection procedure JJG233-
2008, it when using comparison method calibration transducer sensitivity, generallys use in back-to-back fashion, i.e., corrected sensor is rigidly installed
On the top of standard transducer.This method weight certain since corrected sensor has, will affect standard transducer sensitivity
Variation；When corrected sensor weight is less than 100 grams, calibration accuracy is ± 1%.And at 100 grams of corrected sensor weight >,
Test error then increases with weight and is increased.This be mainly corrected sensor weight cause the standard transducer of pressure texture by
Cause the variation of sensitivity in pedestal strain.In order to reduce error caused by above-mentioned reason, when test, generally requires to increase load
Block；Due to the influence of the fixing resonance frequency of the component, when calibrating sensor frequency response (test frequency response > 2kHz), it is necessary to remove
This device just can guarantee the accuracy of frequency sound test.2) central compressed type sensor is to environment such as sound field, magnetic field, transient temperatures
The susceptibility of factor is bigger, easily causes biggish ambient noise, thus causes stability also relatively poor.
Number of patent application is 2018204755733, applying date 2018.04.04, invention and created name are anti-adverse environment
Tri-shear formula piezoelectric accelerometer Chinese patent, it discloses a kind of working frequency is wide, the amplitude linearity is small, maximum horizontal
The tri-shear structural formula acceleration transducer small to remolding sensitivity, but the technical solution internal structure design is unreasonable, it is single
Piezoelectric patches be fixedly mounted on the upper surface of regular triangular prism structure at the top of sensing assembly, piezoelectric patches incude inertia force sensitivity compared with
Difference, it is poor so as to cause entire product measurement accuracy；In addition, stress, single piezoelectricity can be generated on piezoelectric patches in assembling process
Chip architecture, which designs its internal stress, to be discharged, and the presence of the stress can generate the motion profile for the charge that piezoelectric effect generates
It influences, to cause same batch products property difference big, sensitivity consistency is poor, and product stability can be poor.
Summary of the invention
The purpose of this utility model is in view of the deficienciess of the prior art, providing that a kind of load capacity is strong, measurement essence
Degree is high, properties of product are stable, structure manufactures and designs easy modified tri-shear standard acceler.
The utility model is achieved through the following technical solutions:
A kind of modified tri-shear standard acceler, pedestal and the pedestal including being equipped with accessory power outlet
Affixed clamshell, the pedestal, which is equipped with, extends to regular triangular prism inside the clamshell, be equipped in the clamshell along perpendicular to
The regular triangular prism central axial direction and the piezoelectric element group for being bonded the regular triangular prism outer wall；
The piezoelectric element group includes multiple piezoelectric elements stacked gradually；The piezoelectric element includes two panels piezoelectric patches,
The conductive sheet for being equipped with and forming good conductive connection therewith, multiple conductive sheet serial or parallel connections are clamped between two piezoelectric patches
Core wire through lead and the accessory power outlet after connection is conductively connected；
It is the mass block being close to therewith on the outside of the piezoelectric element group, the mass block, the piezoelectric element group are by pre-tightening
Ring is fastenedly connected with the regular triangular prism.
Preferably, the piezoelectric patches is quartz shearing piece.
Preferably, the lead is silver-gilt copper wire.
Preferably, the regular triangular prism, the pedestal, the clamshell, the accessory power outlet are metal material.
Preferably, the regular triangular prism is integral using mould process or laser welding process and the pedestal structure.
Preferably, the clamshell is fixedly connected with the pedestal using laser welding process.
Preferably, the preload ring is memorial alloy ring.
Compared with prior art, the utility model has the beneficial effects that
1. the utility model measurement accuracy is high, properties of product are stablized, and the sensitivity degree of consistency is high；Stacked structure design
Quartz shearing piece internal stress can be made to be superimposed gap location with layer in layer to be released, efficiently solve and answered inside single piezoelectric patches
Influence of the power to charge movement track, has been effectively ensured the stability of product measurement accuracy, product；
2. the utility model load capacity is big；The utility model use tri-shear structure, by preload ring by mass block with
Piezoelectric element is clamped on regular triangular prism, and when acceleration transducer experiences axial vibration, piezoelectric element bears shearing stress, piezoelectricity member
Part is isolated with pedestal, and pedestal stress variation caused by loading does not interfere with the variation of piezoelectric element；The utility model is not only right
Non-vibration interference signal, such as pedestal stress variation, sound field influence have good buffer action, to pedestal caused by transient temperature
Deformation also has isolation well, effective compensation influence of the transient temperature to piezoelectric element；
3. the utility model pre-tightens the stability that ring structure design further increases properties of product；Using preload ring as tight
Firmware can accurately control its shrinking percentage, product sensitivity when effectively ensuring to produce in batches by controlling the temperature of preload ring
Consistency；
4. the utility model assembly technology is simplified, stability is good；Conventional center compression-type structure needs manually to apply one by one
Pretightning force is unable to control the consistency for applying pretightning force every time, while also needing subsequent processing to discharge stress, equally exists same
The problem of one batch product characteristic differs greatly；Using preload ring mode, piezoelectric constant, the matter of piezoelectric element can be measured in advance
The weight and size of gauge block, then a collection of product all adds preload ring, while being sent into the synchronous application pretightning force of heating apparatus；Work
Skill is simple, stability is good, at low cost, is the trustworthy standard transducer for being engaged in the units such as vibration-testing, calibration and calibrating.
Detailed description of the invention
Fig. 1 is the utility model structure diagram；
Fig. 2 is the utility model Fig. 1 partial enlarged view；
Fig. 3 is the utility model reference sensitivity calibrating data；
Fig. 4 is standard transducer load capacity test one schematic diagram of mounting means；
Fig. 5 is standard transducer load capacity test two schematic diagram of mounting means；
Fig. 6 is the utility model standard transducer load capacity test data contrast table.
In figure: 1. accessory power outlets；2. pedestal；3. clamshell；4. regular triangular prism；5. piezoelectric patches；6. conductive sheet；7. mass block；
8. preload ring；9. tested sensor；10. standard transducer；11. additional mass.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
A kind of modified tri-shear standard acceler, pedestal 2 and the base including being equipped with accessory power outlet 1
2 affixed clamshells 3 of seat, the pedestal 2 are equipped with the regular triangular prism 4 extended to inside the clamshell 3, are equipped in the clamshell 3
Along perpendicular to 4 central axial direction of regular triangular prism and being bonded the piezoelectric element group of 4 outer wall of regular triangular prism；
The piezoelectric element group includes multiple piezoelectric elements stacked gradually；The piezoelectric element includes two panels piezoelectric patches 5,
Clamp the conductive sheet 6 for being equipped with and forming good conductive connection therewith between two piezoelectric patches 5, the multiple conductive sheets 6 series connection or
Core wire through lead and the accessory power outlet 1 after being connected in parallel is conductively connected；
It is the mass block 7 being close to therewith on the outside of the piezoelectric element group, the mass block 7, the piezoelectric element group are by pre-
Tight ring 8 is fastenedly connected with the regular triangular prism 4.
Preferably, the piezoelectric patches 5 is quartz shearing piece.
Preferably, the lead is silver-gilt copper wire.
Preferably, the regular triangular prism 4, the pedestal 2, the clamshell 3, the accessory power outlet 1 are metal material.
Preferably, the regular triangular prism 4 is whole using mould process or laser welding process and the pedestal 2 composition one
Body.
Preferably, the clamshell 3 is fixedly connected with the pedestal 2 using laser welding process.
Preferably, the preload ring 8 is memorial alloy ring.
The present embodiment includes pedestal 2 and the affixed clamshell 3 of pedestal 2 equipped with accessory power outlet 1, and pedestal 2 is equipped with and extends to
Regular triangular prism 4 inside clamshell 3, clamshell 3 is interior to be equipped with edge perpendicular to 4 central axial direction of regular triangular prism and is bonded regular triangular prism 4
The piezoelectric element group of outer wall；Piezoelectric element group includes multiple piezoelectric elements stacked gradually；Piezoelectric element includes two panels
Quartz shearing piece, two quartz shear the conductive sheet 6 for clamping between pieces and being equipped with and forming good conductive connection therewith, multiple conductive sheets 6
Core wire through silver-gilt copper wire and accessory power outlet 1 after being connected in series or in parallel is conductively connected.Wherein, regular triangular prism 4, the pedestal 2,
The clamshell 3, the accessory power outlet 1 are metal material, and regular triangular prism 4 is using mould process or laser welding process and base
The seat integral clamshell 3 of 2 structures is fixedly connected with pedestal 2 using laser welding process.
The present embodiment and outside are to be measured according to Newton's second law, F=ma, when mass block 7 is by upper and lower acceleration a's
Under effect, inertia force F can be generated, inertia force F is acted on the piezoelectric element.Piezoelectric element use quartz shearing piece, by
Piezoelectric effect is generated after inertia force F effect, that is, charge Q can be generated on piezoelectric element surface；The charge Q is defeated through silver-gilt copper wire
Accessory power outlet 1 is arrived out, and outer signals acquisition equipment is transferred to by accessory power outlet 1 and is measured.Q=d × F, wherein d is piezoelectricity member
Part inherent characteristic, i.e. piezoelectric constant.Therefore, the quantity of electric charge Q=mad of piezoelectric element output, since d and m is constant, Q
It is proportional with a.By measuring the size of Q, the size of acceleration a can be measured.The present embodiment piezoelectricity core component by
Multiple piezoelectric elements stacked gradually are constituted, and each piezoelectric element is made of quartz shearing piece and conductive sheet 6.Stacked knot
Structure design can make quartz shearing piece internal stress be superimposed gap location with layer in layer and be released, and efficiently solve single piezoelectric patches
Product measurement accuracy has been effectively ensured in influence of the internal stress to charge movement track, and properties of product are stablized, sensitivity consistency
Degree is high；In addition, quartz crystal has piezoelectric constant and dielectric coefficient stability good, and high mechanical strength, no pyroelectric phenomena, absolutely
The advantages that edge impedance is big, the most outstanding is that stability height and insulation impedance are big, thus the present embodiment select quartz crystal as
Piezoelectric element is most able to satisfy requirement of the standard acceler to precision and stability, further increases the measurement essence of product
Degree.The present embodiment uses tri-shear structure, mass block and piezoelectric element is clamped on regular triangular prism by preload ring, acceleration
When sensor experiences axial vibration, piezoelectric element bears shearing stress, and piezoelectric element is isolated with pedestal, pedestal stress caused by loading
Variation does not interfere with the variation of piezoelectric element；The present embodiment is not only to non-vibration interference signal, such as pedestal stress variation, sound field
Equal influences have good buffer action, also have an isolation well to the deformation of pedestal caused by transient temperature, effective compensation wink
Influence of the state temperature to piezoelectric element；The present embodiment properties of product are stablized, and the sensitivity degree of consistency is high；Using preload ring conduct
Fastener can accurately control its shrinking percentage, product sensitivity when effectively ensuring to produce in batches by controlling the temperature of preload ring
Consistency；The present embodiment assembly technology is simplified, stability is good；Conventional center compression-type structure needs artificial apply one by one in advance
Clamp force is unable to control the consistency for applying pretightning force every time, while needing subsequent processing also to discharge stress, same batch products
Property difference is larger；The present embodiment uses preload ring mode, can measure piezoelectric constant, the weight of mass block of position-sensing unit in advance
And size, then a collection of product all adds preload ring, and preload ring uses memorial alloy, memorial alloy be by heating mode into
Row is shunk, as long as controlling the shrinking percentage that temperature controls memorial alloy.Therefore the finishing requirements of either part, also
It is that matching requirements are all relatively low, convenient for production, the product sensitivity degree of consistency after assembling is high, and properties of product are stablized.
The basic performance of the present embodiment is further appreciated that below by several groups of data.
It is to be measured to the reference sensitivity and performance for stability of product first, Figure of description Fig. 3 is certain first meter
Measure the data that the present embodiment sample sensitivity is examined and determine in examination research center.The test condition is vibration frequency f=
160Hz, acceleration a=100m/s2.The stability requirement of standard transducer year is less than 0.5%, by the visible the present embodiment of above-mentioned data
Meet the stability requirement of standard transducer year.
The cross sensitivity ratio of followed by cross sensitivity ratio, standard acceler wants ﹤ 2%；Conventional acceleration passes
For the cross sensitivity of sensor due to structure design etc., it is highly difficult once to reach this index, needs by multiple
Adjustment and test can be only achieved this index of ﹤ 2% repeatedly.Thus bring assembly difficulty and cost are substantially increased, and finished product is qualified
Rate is relatively low.The present embodiment smart structural design, cross sensitivity is once assembled is attained by ﹤ 2% substantially, effectively reduces life
Cost is produced, product qualified rate is also very high.
Next the load capacity of the present embodiment is tested, Denmark BK8305 and the present embodiment is selected to compare survey
Examination.Corrected sensor is the acceleration transducer of market tradition multi-layer Shear-type, sensor self weight 30g；Two standards first pass
Attached drawing test mounting means shown in Fig. 4 measures corrected sensor to sensor to specifications respectively, and 9 representatives are tested in figure
Sensor, 10 represent standard transducer；Then according still further to Figure of description mounting means shown in fig. 5, configure a 200g's
Additional mass measures, and 9 represent tested sensor in Fig. 5, and 10 represent standard transducer, and 11 represent additional mass.Two
Standard transducer load capacity test data is as shown in Figure of description Fig. 6.As can be seen that working as from the tables of data that Fig. 6 is provided
The present embodiment reaches 230g as standard transducer, the weight of tested sensor, causes tested transducer sensitivity error ﹤
0.18%；And BK8305 makees standard transducer, the weight of tested sensor reaches 230 grams, is tested transducer sensitivity error ﹤
1.14%.It can be seen that the present embodiment sensitivity calibration precision is substantially better than traditional standard sensor.
In conclusion the preferred embodiment of only the utility model, is not used to limit the utility model implementation
Range, all equivalent changes according to carried out by shape described in the utility model claims range, construction, feature and spirit with repair
Decorations, should be included in the scope of the claims of the utility model.
Claims (7)
1. a kind of modified tri-shear standard acceler, including being equipped with the pedestal of accessory power outlet, consolidating with the pedestal
The clamshell connect, the pedestal are equipped with the regular triangular prism extended to inside the clamshell, it is characterised in that:
It is equipped with edge in the clamshell perpendicular to the regular triangular prism central axial direction and is bonded the regular triangular prism lateral wall point
The piezoelectric element group of cloth；
The piezoelectric element group includes multiple piezoelectric elements stacked gradually；The piezoelectric element includes two panels piezoelectric patches, two institutes
The conductive sheet for clamping between piezoelectric patches and being equipped with and forming conductive connection therewith is stated, multiple conductive sheets pass through after being connected in series or in parallel
The core wire of lead and the accessory power outlet is conductively connected；
Be the mass block being close to therewith on the outside of the piezoelectric element group, the mass block, the piezoelectric element group by preload ring with
The regular triangular prism is fastenedly connected.
2. modified tri-shear standard acceler according to claim 1, it is characterised in that: the piezoelectric patches
Piece is sheared for quartz.
3. modified tri-shear standard acceler according to claim 1, it is characterised in that: the lead is
Silver-gilt copper wire.
4. modified tri-shear standard acceler according to claim 1, it is characterised in that: the positive trigone
Column, the pedestal, the clamshell, the accessory power outlet are metal material.
5. modified tri-shear standard acceler according to claim 1 or 4, it is characterised in that: it is described just
Triangular prism is integral using mould process or laser welding process and the pedestal structure.
6. modified tri-shear standard acceler according to claim 1, it is characterised in that: the clamshell with
The pedestal is fixedly connected using laser welding process.
7. modified tri-shear standard acceler according to claim 1, it is characterised in that: the preload ring
For memorial alloy ring.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366752A (en) * | 2020-03-16 | 2020-07-03 | 深圳华清精密科技有限公司 | Annular shear piezoelectric acceleration sensor structure and manufacturing method thereof |
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
| CN114563596A (en) * | 2021-11-16 | 2022-05-31 | 浙江中控技术股份有限公司 | Anti-interference and high-pressure-resistant triangular shear piezoelectric acceleration sensor |
| CN114755454A (en) * | 2022-03-23 | 2022-07-15 | 北京遥测技术研究所 | Three-direction high-temperature piezoelectric acceleration sensor and assembling method thereof |
| CN118687633A (en) * | 2024-08-28 | 2024-09-24 | 山东利恩斯智能科技有限公司 | Force and acceleration combined type multifunctional sensor and working method thereof |
-
2019
- 2019-02-26 CN CN201920240048.8U patent/CN209542647U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366752A (en) * | 2020-03-16 | 2020-07-03 | 深圳华清精密科技有限公司 | Annular shear piezoelectric acceleration sensor structure and manufacturing method thereof |
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
| CN114563596A (en) * | 2021-11-16 | 2022-05-31 | 浙江中控技术股份有限公司 | Anti-interference and high-pressure-resistant triangular shear piezoelectric acceleration sensor |
| CN114755454A (en) * | 2022-03-23 | 2022-07-15 | 北京遥测技术研究所 | Three-direction high-temperature piezoelectric acceleration sensor and assembling method thereof |
| CN118687633A (en) * | 2024-08-28 | 2024-09-24 | 山东利恩斯智能科技有限公司 | Force and acceleration combined type multifunctional sensor and working method thereof |
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