CN201440092U - Piezoelectric type dynamic bar-shaped weighing plate - Google Patents
Piezoelectric type dynamic bar-shaped weighing plate Download PDFInfo
- Publication number
- CN201440092U CN201440092U CN2009201858601U CN200920185860U CN201440092U CN 201440092 U CN201440092 U CN 201440092U CN 2009201858601 U CN2009201858601 U CN 2009201858601U CN 200920185860 U CN200920185860 U CN 200920185860U CN 201440092 U CN201440092 U CN 201440092U
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- upper cover
- weighing plate
- shaped weighing
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Abstract
The utility model relates to a piezoelectric type dynamic bar-shaped weighing plate, mainly comprising an upper cover board, a lower cover board and structured quartz crystal combination; the piezoelectric type dynamic bar-shaped weighing plate is characterized in that: the upper cover board and the lower cover board are combined together by tightening a pre-tightening bolt, the cross section of the upper cover board and the lower cover board is a horizontal H shape, a concave groove is arranged at the combining position of the upper cover board and the lower cover board, and the structured quartz crystal combination is arranged in the concave groove, and a guide electrode is arranged on the quartz crystal combination. In the utility model, the characteristic that the piezoelectric quartz is a sensitive element is utilized, the structured element is embedded in a beam structure which is designed optimally, so as to construct the bar-shaped weighing plate for dynamic weighing of automobiles; a detached structure is adopted, the bar-shaped weighing plate has the characteristics of simple structure, convenient processing, debugging and installation, long dynamic range and high measuring precision.
Description
Technical field
The utility model relates to a kind of axle for vehicle carrier strip shape weighing plate, particularly is used for the quartz weighing plate that vehicle dynamic is weighed based on piezoelectric effect is a kind of.
Background technology
(weigh in motion WIM) is the important component part of intelligent transportation system to dynamic weighing.The MEASUREMENT OF STEAM axletree aspects such as operation, management, maintenance and law enforcement of carrying for highway all have great importance quickly and accurately.After particularly entering the nineties, along with economic development, the overload of vehicle problem in the communications and transportation is also serious day by day, and these problems have seriously influenced the serviceable life of road transporting safety and roadnet, makes highway communication facility maintenance cost excessive increase.Traditional overload detects needs the vehicle parking inspection, the big heavy discount of efficient that this just makes measurement, for this reason, it is little, highly low, in light weight to press for a kind of volume, and rigidity is big, the natural frequency height, dynamic range is wide, highly sensitive dynamic weighing sensor and dynamic road vehicle weighing system.And aspect traffic engineering, utilize the dynamic weighing data to have the bridge and the road of limit for tonnage requirement that great effect is arranged to efficient and the protection that improves the heavy traffic transportation.In addition, the dynamic weighing data can be used for predicting prospect traffic volume, are convenient to formulate traffic programme and transport development, and traffic administration and means of transportation are safeguarded, determine often to take place the highway section or the vehicle of overload problem.
Abroad since 20th century 50 just the research of this respect, and comparatively ripe product just arranged in the nineties, companies such as present German PAT, Switzerland Kistler, U.S. Mikros have all developed Related product, and obtained large-scale application, use and test result show, it has good dynamic property, anti-fatigue life and measuring accuracy.Switzerland Kistler (Kistler) company develops and can be embedded under the road surface is the whole I-shape beam shape dynamic weighing sensor of sensitive element with the quartz crystal; be used for the road vehicle axle and carry the overload anticipation; the bridge overload warning, protecting tunnel and axle for vehicle carry metering, have obtained good effect.。But the fraud costliness of this system, the manufacturing of LOAD CELLS, assembly technology more complicated.
Summary of the invention
The utility model patent purpose is the deficiency at existing I-shape beam shape LOAD CELLS, a kind of separate type girder construction simple in structure is provided, the employing piezoelectric quartz is a sensitive element, with the lateral arrangement of the quartzy brilliant group of the structuring that is connected in parallel along beam, forms the shape weighing plate of bar.
The utility model piezoelectric type dynamic strip-shaped weighing plate mainly comprises: upper cover plate, lower cover, three parts of the quartzy brilliant group of structuring constitute.Upper cover plate and lower cover combine by fastening pretension bolt, in order to reach the effect of sealing, adopt welding to seal in the junction.The cross section of upper cover plate and lower cover is I-shaped, and upper cover plate and lower cover junction are provided with Baltimore groove, and mounting structure fossil English crystalline substance is organized in Baltimore groove, and the electric charge of its generation is derived by electrode.The cross section that whole strip-shaped weighing plate is installed on the road surface is the groove inside of rectangle, adopt the fillet soft foam around above-mentioned strip-shaped weighing plate periphery, can reduce like this vehicle by the time produce the horizontal interference that transverse force causes, and adopt fixedly LOAD CELLS body of 75% quartz sand and 25% epoxy resin composition.Be equipped with the quartz sand epoxide-resin layer on the upper cover plate and be connected, be provided with baffle plate between quartz sand epoxide-resin layer and the groove with the road surface, it can reduce vehicle by the time transverse force that produces, thereby reduce the interference that transverse force causes.
The quartzy brilliant group of structuring of the present utility model comprises: yellow gold electrode, piezoelectric quartz crystal and potsherd constitute.Whole brilliant group electrode in structurizing process, sensitive element quartz crystal and potsherd get separately that the faying face place needs coated with conductive glue, and after brilliant group was finished curing, surface-coated high resistant insulating gel outside was to improve insulation impedance.The quartzy brilliant group 4 of structuring is installed in the center of girder construction, as loading behind upper cover plate, transmission by power acts on the quartzy brilliant group of structuring it, lower surface produces and acts on the positive and negative charge amount that its surface force is in proportion thereon then, charge signal is sent to signal processing units such as charge amplifier by signal electrode, obtain vehicle load by Treatment Analysis at last, the number of axle, information such as the speed of a motor vehicle.In order to prevent that charge signal from leaking, what output line adopted is low noise concentric cable.
Vehicle is by strip-shaped weighing plate the time, implanting that the brilliant group of piezoelectric quartz in the plate can be subjected to must pressure, so just can produce charge generation with pressure size cost ratio, by the electrode between the crystalline substance group with electric charge lead-in signal processing unit, just it is heavy to obtain axle, information such as the number of axle and vehicle load, thus realize dynamic weighing.Need it is carried out preload in the use of piezoelectric quartz crystal element, can eliminate the gap of surface in contact like this, increase contact stiffness, improve the linearity, sensitivity and the dynamic response measured.Girder construction is designed to separate type, is convenient to install and the pretightning force debugging.Carry out preload by the bolt that designs, the size that changes pretightning force can be mediated to weigh bar sensitivity and horizontal output consistent performance.This structure adopts high-strength aluminum alloy, by finite element optimum design, makes it have flexural rigidity with the flexible coupling in road surface, thereby guarantees that sensor has higher linearity and sensitivity.The design of total will guarantee that load is delivered on the quartz crystal unit as far as possible, and the various interference that the distortion of beam causes are less, so need reasonably design for the rigidity of beam.
The piezoelectric quartz dynamic strip-shaped weighing plate of the utility model patent must be embedded under the road surface when using, and its upper cover plate is the load-bearing face, and lower cover is placed in and is supporting surface on the highway foundation.Because at the vehicle of running on expressway, the horizontal force that on the road surface, produces may with the sizableness of vertical force.Be to guarantee the accuracy of Dynamic Weighting, reduce the interference that horizontal force causes, quarantine measures are taked on reply strip-shaped weighing plate and road surface, to obtain high-quality signal pulse shape and measurement result repeatably.
The utility model utilizes piezoelectric quartz to be sensitive element, with structurized element, implantation is through the optimal design girder construction, construct a kind of strip-shaped weighing plate that vehicle dynamic is weighed that is used for, adopt separate type, it has simple in structure, processing, debugging and install more conveniently, and dynamic range is big, characteristics such as measuring accuracy height.
Description of drawings
Fig. 1 strip-shaped weighing slab and girder synoptic diagram
Fig. 2 strip-shaped weighing plate structural entity figure
The quartzy brilliant group structural representation of Fig. 3
The brilliant group of Fig. 4 quartz crystal structureization scheme of installation
Fig. 5 bar mounting structure synoptic diagram of weighing
Fig. 6 weighing plate mounting arrangement figure
Fig. 7 part wheel load signal graph
Fig. 8 truck synoptic diagram
Fig. 9 vehicle bar output signal of weighing during by truck.
Specific embodiment
Below in conjunction with accompanying drawing structural principle of the present utility model and principle of work are done detailed explanation.
With reference to Fig. 1,2, the strip-shaped weighing plate of weighing that the utility model is related mainly comprises: upper cover plate 1, and lower cover 2,4 three parts of the quartzy brilliant group of structuring constitute.Total is combined by fastening pretension bolt 3 by upper cover plate 1 and lower cover 2, in order to reach the effect of sealing, adopts welding to seal in the junction.Upper cover plate 1 is I-shaped with the cross section of lower cover 2, and upper cover plate 1 is provided with Baltimore groove with lower cover 2 junctions, and mounting structure fossil English crystalline substance organizes 4 in Baltimore groove, and the electric charge of its generation is derived by electrode 6.The cross section that whole strip-shaped weighing plate is installed on the road surface is groove 11 inside of rectangle, adopt fillet soft foam 12 around the whole periphery of above-mentioned strip-shaped weighing plate, can reduce like this vehicle by the time produce the horizontal interference that transverse force causes, and adopt fixedly LOAD CELLS body of 75% quartz sand and 25% epoxy resin composition 13.Be equipped with quartz sand epoxide-resin layer 9 on the upper cover plate 1 and be connected, be provided with baffle plate 10 between quartz sand epoxide-resin layer 9 and the groove 11 with the road surface, it can reduce vehicle by the time transverse force that produces, thereby reduce the interference that transverse force causes.
The quartzy brilliant group 4 of structuring is installed in the center of girder construction, after load p acts on upper cover plate 1, transmission by power acts on the quartzy brilliant group 4 of structuring it, lower surface produces and acts on the positive and negative charge amount that its surface force is in proportion thereon then, charge signal is sent to single 14 yuan of signal Processing such as charge amplifier by signal electrode 6, as shown in Figure 6, obtains vehicle load by Treatment Analysis at last, the number of axle, information such as the speed of a motor vehicle.In order to prevent that charge signal from leaking, what output line adopted is low noise concentric cable 15.The weighing plate of this practicality invention is a part wheel load formula structure, both vehicle had only the part tire to act on the weighing plate upper cover plate 1 by weighing plate the time, by carrying out integration for tire in time through the pulse signal that produces, and multiply by the speed of a motor vehicle, just can obtain axle and carry.So the appropriate design of upper cover plate 1 width is very important, and the cross sensitivity and the linearity of it and the whole bar of weighing are closely related, and have structural amplification for the signal of power.The rigidity Design of certain whole girder construction also is crucial, the linearity and the sensitivity of it and sensor are closely related, because its load sharing effect, make to act on the quartzy brilliant part of organizing acting force upper cover plate used load on 4 of structuring, its size is relevant with the ratio of the rigidity of quartzy brilliant group 4 of structuring and whole girder construction.
Referring to Fig. 3,4, the quartzy brilliant group 4 of the structuring of the utility model patent comprises: yellow gold electrode 6, piezoelectric quartz crystal 7 and potsherd 8 constitute.Because the easy leaks of electric charge itself, thus the yellow gold that conducts electricity very well adopted, and also this elasticity modulus of materials can not reduce the dynamic property of whole sensor than red copper and Yin Genggao.Piezoelectric quartz 7 employing quality factor height, the synthetic quartz that defective is few adopt the disk shape.Be connected in parallel and improve the sensitivity of sensor.It is to improve insulation impedance that potsherd mainly acts on, and prevents that electric charge from leaking, and is kinetic measurement because relate to, so require potsherd to have certain impact flexibility, selects the zirconia ceramics sheet with high strength and excellent toughness for use for this reason.Whole brilliant group electrode 6 in structurizing process, sensitive element quartz crystal 7 and potsherd 8 need coated with conductive glue in the faying face place separately, and need apply the pretightning force about 100 kilograms when solidifying, and can improve contact stiffness like this.After brilliant group was finished curing, surface-coated high resistant insulating gel outside was to improve insulation impedance.
Referring to Fig. 5, the mounting means when the utility model patent is used for vehicle weighing: the piezoelectric quartz strip-shaped weighing plate must be embedded under the road surface when using.At road surface cutting square-section groove 11, then piezoelectric quartz strip-shaped weighing bar is imbedded, be formed for the dynamic weighing plate of measuring vehicle load-carrying on the highway, wherein upper cover plate 1 is the load-bearing face, lower cover 2 is placed in and is supporting surface on the highway foundation.Because at the vehicle of running on expressway, the horizontal force that on the road surface, produces may with the sizableness of vertical force.Be to guarantee the accuracy of kinetic measurement, the reply strip-shaped weighing plate is taked quarantine measures with the road surface, eliminates or the influence of minimizing horizontal force, to obtain high-quality signal pulse shape and measurement result repeatably as far as possible.When strip-shaped weighing plate is imbedded ground, adopt fillet soft foam 12 around the whole periphery of sensor, with LOAD CELLS and horizontal force R isolation, and adopt fixedly LOAD CELLS body etc. of 75% quartz sand and 25% epoxy resin composition 13.In order to reach consistent with the road wear characteristic, the sensor upper surface is furnished with the overlayer 9 of the thick quartz sand epoxy resin of 10mm.By grinding, can make the out-of-flatness of sensor upper strata and road, consistent such as couplings such as rut groove marks.In order further to reduce the interference that horizontal lateral force produces, in the both sides of upper cover plate 1 baffle plate 10 is installed, so just can significantly reduce owing to horizontal lateral force R disturbs the measuring error that produces.The sensitive axes that will guarantee sensor when mounted is to consistent with the axis of cover plate up and down, otherwise can produce transversal effect.Surface of contact is installed is required to have the height depth of parallelism, flatness and low side roughness.
Correct sensor installation is the important assurance that obtains measuring accuracy.Improper meeting is installed brings very mistake to measurement result.Installation is to pay special attention to make external force evenly, vertically to act on the upper and lower surface of sensor, makes every effort to avoid and reduce side force.Only when external force evenly distributes, just can make full use of whole measurement range, otherwise transship easily and cause the damage of sensor.The lid surface up and down that contacts with sensor must fit tightly with the upper and lower surface of sensor.
Referring to Fig. 6, again along the highway direction, arrange two strip-shaped weighing plates at a certain distance during installation.By the mistiming of signal of sensor, just can accurately calculate the speed of a motor vehicle, this is the key of signal subsequent treatment.
Referring to Fig. 7,, has only the width about 50mm because quartz transducer is banded, therefore, because the influence of factors such as the diameter of tire, wheel load, charge pressure, sensor has only covered a part of ground connection trace of tire, (typical ground connection trace variation range is that 100mm is to 300mm).This moment, the loading end width was less than wheelmark length, any time the weight of tire all be to bear jointly by sensor and road surface, its output waveform as shown in Figure 7, the area of waveform (integrated value) has been represented the load of wheel.Consider wheel load and road surface separating before and after wheel load and sensor contact area, must consider to act on the line integral of wheel load on the sensor, limit of integration contacts wheel separation to the end for the first time from sensor, wheelmark length is not the variable that can directly measure, it can according to sensor duration of contact t and wheel speed v multiply each other and obtain.What this mode was measured is dynamic tire force.
Fig. 8, the 9th, the signal pulse when truck passes through strip-shaped weighing plate is an example with 6 common on highway axle load automobiles, signal can obtain the number of axle of vehicle, the heavy and gross vehicle load-carrying of axle.
Claims (3)
1. piezoelectric type dynamic strip-shaped weighing plate, mainly comprise: upper cover plate, lower cover, three parts of the quartzy brilliant group of structuring constitute, it is characterized in that: upper cover plate and lower cover combine by fastening pretension bolt, the cross section of upper cover plate and lower cover is I-shaped, upper cover plate and lower cover junction are provided with Baltimore groove, and mounting structure fossil English crystalline substance is organized in Baltimore groove, and quartzy brilliant group is provided with leadout electrode.
2. piezoelectric type dynamic strip-shaped weighing plate as claimed in claim 1, it is characterized in that: the brilliant group of described fossil English comprises: yellow gold electrode, piezoelectric quartz crystal and potsherd constitute, and by signal electrode charge signal are sent to the charge amplifier signal processing unit.
3. piezoelectric type dynamic strip-shaped weighing plate as claimed in claim 1, it is characterized in that: the cross section that above-mentioned strip-shaped weighing plate is installed on the road surface is the groove inside of rectangle, adopt the fillet soft foam around above-mentioned strip-shaped weighing plate periphery, and adopt fixedly LOAD CELLS body of quartz sand epoxide-resin layer, be equipped with the quartz sand epoxide-resin layer on the upper cover plate and be connected, be provided with baffle plate between quartz sand epoxide-resin layer and the groove with the road surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201858601U CN201440092U (en) | 2009-07-20 | 2009-07-20 | Piezoelectric type dynamic bar-shaped weighing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201858601U CN201440092U (en) | 2009-07-20 | 2009-07-20 | Piezoelectric type dynamic bar-shaped weighing plate |
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| CN201440092U true CN201440092U (en) | 2010-04-21 |
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| CN2009201858601U Expired - Fee Related CN201440092U (en) | 2009-07-20 | 2009-07-20 | Piezoelectric type dynamic bar-shaped weighing plate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625254A (en) * | 2009-07-20 | 2010-01-13 | 江西省交通运输技术创新中心 | Piezoelectric type dynamic strip-shaped weighing plate |
| CN102230818A (en) * | 2011-03-31 | 2011-11-02 | 西安交通大学 | Double-C-shaped piezoelectric dynamic axle load sensor |
| CN103674201A (en) * | 2013-10-23 | 2014-03-26 | 大连理工大学 | Piezoelectric intelligent road vehicle dynamic weighing apparatus |
| EP2769186A1 (en) * | 2011-10-20 | 2014-08-27 | Kistler Holding AG | Hollow profile sensor |
| CN104040307A (en) * | 2012-01-11 | 2014-09-10 | 基斯特勒控股公司 | Sensor package for WIM sensor and WIM sensor |
| CN106500809A (en) * | 2016-12-08 | 2017-03-15 | 四川华路安科技有限公司 | There is the flexible pavement weighing system and installation method of piezoquartz LOAD CELLS |
| CN108470658A (en) * | 2018-06-05 | 2018-08-31 | 江苏省交通技师学院 | A kind of foam pressure formula switch |
-
2009
- 2009-07-20 CN CN2009201858601U patent/CN201440092U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625254A (en) * | 2009-07-20 | 2010-01-13 | 江西省交通运输技术创新中心 | Piezoelectric type dynamic strip-shaped weighing plate |
| CN101625254B (en) * | 2009-07-20 | 2013-12-18 | 江西省交通运输技术创新中心 | Piezoelectric type dynamic strip-shaped weighing plate |
| CN102230818A (en) * | 2011-03-31 | 2011-11-02 | 西安交通大学 | Double-C-shaped piezoelectric dynamic axle load sensor |
| CN102230818B (en) * | 2011-03-31 | 2013-04-17 | 西安交通大学 | Double-C-shaped piezoelectric dynamic axle load sensor |
| EP2769186A1 (en) * | 2011-10-20 | 2014-08-27 | Kistler Holding AG | Hollow profile sensor |
| CN104040307A (en) * | 2012-01-11 | 2014-09-10 | 基斯特勒控股公司 | Sensor package for WIM sensor and WIM sensor |
| CN103674201A (en) * | 2013-10-23 | 2014-03-26 | 大连理工大学 | Piezoelectric intelligent road vehicle dynamic weighing apparatus |
| CN106500809A (en) * | 2016-12-08 | 2017-03-15 | 四川华路安科技有限公司 | There is the flexible pavement weighing system and installation method of piezoquartz LOAD CELLS |
| CN108470658A (en) * | 2018-06-05 | 2018-08-31 | 江苏省交通技师学院 | A kind of foam pressure formula switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100421 Termination date: 20120720 |