CN109506747B - Weighing piezoelectric sensor, preparation method thereof and highway weighing system - Google Patents
Weighing piezoelectric sensor, preparation method thereof and highway weighing system Download PDFInfo
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- CN109506747B CN109506747B CN201811430324.3A CN201811430324A CN109506747B CN 109506747 B CN109506747 B CN 109506747B CN 201811430324 A CN201811430324 A CN 201811430324A CN 109506747 B CN109506747 B CN 109506747B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/021—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles having electrical weight-sensitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
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Abstract
The invention discloses a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system. The piezoelectric weighing sensor includes: the device comprises a pressure conduction structure, a pre-tightening force clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit; the pre-tightening force clamping plate comprises a bottom plate and two symmetrical pre-tightening force side plates, the quartz piezoelectric crystal is arranged above the bottom plate, and the pressure conduction structure is clamped above the quartz piezoelectric crystal by the two symmetrical pre-tightening force side plates; the quartz piezoelectric crystal is provided with an electrode, and the quartz piezoelectric crystal is connected with the signal conditioning circuit through the electrode. The invention realizes weighing through the pressure conduction structure, the pretightening force splint and the quartz piezoelectric crystal, simplifies the structure of the highway weighing system, converts measured analog signals into digital signals through the signal conditioning circuit for transmission, avoids distortion in the signal transmission process and improves the weighing precision.
Description
Technical Field
The invention relates to the field of traffic supervision, in particular to a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system.
Background
The highway weighing system is applicable to highway weighing charging system, can be used to overload control and overspeed control and road monitoring, and at present, the vast majority of weighing sensor volume that the road used needs heavy machinery's help when the installation, and is very big to the vehicle flow influence, causes traffic jam easily, for example: the whole vehicle type weighing scheme has the advantages that the distance between the center line of the dynamic scale weighing platform and the center line of the toll booth is about 20 meters, the scheme needs the help of large machinery, and the road sealing is needed for a long time. Other like the bent plate formula scheme of weighing, bulky, and the bent plate can produce plastic deformation after rolling for a long time, makes the precision descend, what the scheme of weighing obtained and transmitted in addition is analog signal, can cause the distortion of signal in transmission process. How to simplify the structure of highway weighing system, improve the precision of weighing becomes a technical problem that needs to solve urgently.
Disclosure of Invention
The invention aims to provide a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system, so as to simplify the structure of the highway weighing system and improve the weighing precision.
In order to achieve the purpose, the invention provides the following scheme:
a weighing piezoelectric sensor, comprising:
the device comprises a pressure conduction structure, a pre-tightening force clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit;
the pre-tightening force clamping plate comprises a bottom plate and two symmetrical pre-tightening force side plates, the quartz piezoelectric crystal is arranged above the bottom plate, and the pressure conduction structure is clamped above the quartz piezoelectric crystal by the two symmetrical pre-tightening force side plates;
the quartz piezoelectric crystal is provided with an electrode, the quartz piezoelectric crystal is connected with the signal conditioning circuit through the electrode, and the quartz piezoelectric crystal is used for weighing an analog signal of the weight applied to the pressure conduction structure and sending the analog signal of the weight to the signal conditioning circuit;
the signal conditioning circuit is used for converting the weight analog signal output by the quartz piezoelectric crystal into a weight digital signal and leading out the weight digital signal through an output lead.
Optionally, the pressure conduction structure includes an upper layer structure, a middle layer structure and a lower layer structure, the upper layer structure is an isosceles trapezoid, and the area of the upper surface of the upper layer structure is larger than the area of the lower bottom surface of the upper layer structure; the middle layer structure is a cuboid with the upper surface and the lower bottom surface of the upper layer structure in the same shape, the lower layer structure is an isosceles trapezoid body with a rounded angle between the upper bottom surface and two side surfaces, the area of the upper surface of the lower layer structure is larger than that of the lower surface of the lower layer structure, the lower bottom surface of the upper layer structure is superposed with the upper surface of the middle layer structure, and the lower surface of the middle layer structure is superposed with the upper bottom surface of the lower layer structure;
two symmetrical pretightening force side plates of the pretightening force clamping plate are clamped at the included angle between the upper bottom surface and two side surfaces of the lower layer structure;
the quartz piezoelectric crystal is arranged between the lower bottom surface of the lower layer structure and the bottom plate of the pre-tightening force clamping plate.
Optionally, the signal conditioning circuit includes a charge amplifier, an instrumentation amplifier, a filter, and a single chip microcomputer;
the charge amplifier is respectively connected with the electrode of the quartz piezoelectric crystal and the instrument amplifier, and is used for amplifying the charge of the analog signal of the weight measured by the quartz piezoelectric crystal and sending the signal after the charge amplification to the instrument amplifier;
the instrument amplifier is connected with the filter and used for carrying out instrument amplification on the signal obtained after the charge amplification and sending the signal obtained after the instrument amplification to the filter;
the filter is connected with the singlechip and used for filtering the signal amplified by the instrument and sending the filtered signal to the singlechip;
the single chip microcomputer is used for converting the filtered signals into digital signals of the weight and leading out the digital signals of the weight through an output lead.
Optionally, the weighing piezoelectric sensor further comprises a housing, the pressure conduction structure, the pre-tightening force clamping plate, the quartz piezoelectric crystal and the signal conditioning circuit are sealed into a preset structure through hollow glass microsphere reinforced foam plastics, and the preset structure is arranged in the housing.
Optionally, the piezoelectric weighing sensor further comprises a surface layer made of a concrete material, and the surface layer is laid on the upper surface of the pressure conduction structure.
Optionally, the pressure conducting structure and the pre-tightening force clamping plate are made of light alloy.
A preparation method of a weighing piezoelectric sensor comprises the following steps:
laying electrodes on the quartz piezoelectric crystal;
connecting the electrode with a signal conditioning circuit through a lead;
the two side plates of the pre-tightening force clamping plate are propped open by using a horizontal external force, and a quartz piezoelectric crystal, a signal conditioning circuit and a pressure conduction structure which are connected are put in;
and removing the horizontal external force to obtain the sensor main body.
Optionally, removing the horizontal external force to obtain a sensor body, and then further including:
bonding hollow glass microsphere reinforced foam plastic on the outer side of the sensor main body, and sealing the sensor main body into a preset structure;
and placing the preset structure in a shell.
A highway weighing system, comprising: the system comprises a plurality of weighing piezoelectric sensors, cameras, an upper computer and a remote monitoring terminal;
the camera is connected with the upper computer and used for shooting license plate number information of vehicles entering the weighing area of the expressway and sending the license plate number information to the upper computer;
the plurality of weighing piezoelectric sensors are embedded on the ground of the highway weighing area side by side, output wires of the weighing piezoelectric sensors are led out through wire grooves on the ground of the highway weighing area, the weighing piezoelectric sensors are connected with the upper computer through the output wires, the weighing piezoelectric sensors are used for weighing digital signals of the weight of vehicles entering the highway weighing area, and the digital signals of the weight are sent to the upper computer;
the upper computer is connected with the remote monitoring terminal and is used for decoding the digital signal of the weight to obtain weight information of the vehicle, corresponding the license plate number information with the weight information of the vehicle to obtain weight information of the corresponding vehicle and sending the weight information of the corresponding vehicle to the remote monitoring terminal;
and the remote monitoring terminal is used for carrying out weight-metering charging and overweight violation management according to the weight information of the corresponding vehicle.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system, wherein the weighing piezoelectric sensor comprises the following components: the device comprises a pressure conduction structure, a pre-tightening force clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit; the weighing is realized through the pressure conduction structure, the pretightening force splint and the quartz piezoelectric crystal, the structure of the highway weighing system is simplified, the main body structures of the sensors are in rigid connection, the frequency response of the sensors is greatly improved, the sensors can process weighing tasks under various vehicle flow conditions, vibration noise generated by rigid connection can be greatly reduced by matching with a pattern recognition related algorithm, and the signal precision can be ensured while the high-frequency response is maintained. The measured analog signals are converted into digital signals through the signal conditioning circuit for transmission, so that distortion in the signal transmission process is avoided, and the weighing precision is further improved. The weighing piezoelectric sensor provided by the invention has the advantages that the structure of a highway weighing system is simplified, and the weighing speed and precision are improved.
The invention also adopts the hollow glass microsphere reinforced foam plastic to seal the pressure conduction structure, the pretightening force clamping plate, the quartz piezoelectric crystal and the signal conditioning circuit, and the sealed structure is placed in the shell, and the hollow glass microsphere reinforced foam plastic inhibits transverse vibration, thereby achieving the purpose of accurately measuring the vertical axle weight, improving the dustproof, waterproof and anti-corrosion performances, greatly improving the stability of the sensor, prolonging the service life of the sensor and enabling the whole weighing system to be more convenient to maintain and use.
The sensor body of the invention adopts the material characteristics of the light alloy material, so that the sensor has good corrosion resistance, and the service life and the working stability of the sensor can be greatly improved by matching with the shell.
The pressure conduction structure and the pre-tightening force clamping plate are made of light alloy materials, so that the weight of the weighing sensor is reduced, and the weighing sensor is convenient to install.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a piezoelectric weighing sensor according to the present invention;
FIG. 2 is a perspective view of a piezoelectric weighing sensor according to the present invention;
FIG. 3 is a block diagram of a signal conditioning circuit of a weighing piezoelectric sensor according to the present invention;
fig. 4 is a structural diagram of a highway weighing system provided by the invention.
Detailed Description
The invention aims to provide a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system, so as to simplify the structure of the highway weighing system and improve the weighing precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
As shown in fig. 1, the weighing piezoelectric sensor includes:
the pressure conduction structure 1, the pretightening force splint 2, the quartz piezoelectric crystal 3 and the signal conditioning circuit 4; the pre-tightening force clamping plate 2 comprises a bottom plate 21 and two symmetrical pre-tightening force side plates 22, the quartz piezoelectric crystal 3 is arranged above the bottom plate 21, and the pressure conduction structure 1 is clamped above the quartz piezoelectric crystal 3 by the two symmetrical pre-tightening force side plates 22; the quartz piezoelectric crystal 3 is provided with an electrode, the quartz piezoelectric crystal is connected with the signal conditioning circuit 4 through the electrode, and the quartz piezoelectric crystal 3 is used for weighing an analog signal of the weight applied to the pressure conduction structure and sending the analog signal of the weight to the signal conditioning circuit; the signal conditioning circuit 4 is used for converting the weight analog signal output by the quartz piezoelectric crystal 3 into a weight digital signal and leading out the weight digital signal through an output lead. The weighing piezoelectric sensor directly outputs digital signals, has strong anti-interference capability and wide selectable transmission mode range, and the signal intensity is not limited by the transmission distance.
As shown in fig. 2, the pressure conduction structure 1 includes an upper layer structure 11, a middle layer structure 12 and a lower layer structure 13, the upper layer structure 11 is an isosceles trapezoid, and the area of the upper surface of the upper layer structure 11 is larger than the area of the lower bottom surface of the upper layer structure 11; the middle structure 12 is a cuboid with the upper surface in the same shape as the lower bottom surface of the upper structure 11, the lower structure 13 is an isosceles trapezoid body with an included angle between the upper bottom surface and two side surfaces being a rounded angle, the area of the upper surface of the lower structure 13 is larger than that of the lower surface of the lower structure 13, the lower bottom surface of the upper structure 11 is overlapped with the upper surface of the middle structure 12, and the lower surface of the middle structure 12 is overlapped with the upper bottom surface of the lower structure 13; two symmetrical pretightening force side plates 22 of the pretightening force clamping plate 2 are clamped at the included angle between the upper bottom surface and two side surfaces of the lower layer structure 13; the quartz piezoelectric crystal 3 is placed between the lower bottom surface of the lower layer structure 13 and the bottom plate of the pre-tightening force clamping plate 2.
As shown in fig. 3, the signal conditioning circuit 4 includes a charge amplifier, an instrumentation amplifier, a filter, and a single chip; the charge amplifier is respectively connected with the electrode of the quartz piezoelectric crystal 3 and the instrument amplifier, and is used for amplifying the charge of the analog signal of the weight measured by the quartz piezoelectric crystal and sending the signal after the charge amplification to the instrument amplifier; the instrument amplifier is connected with the filter and used for carrying out instrument amplification on the signal obtained after the charge amplification and sending the signal obtained after the instrument amplification to the filter; the filter is connected with the singlechip and used for filtering the signal amplified by the instrument and sending the filtered signal to the singlechip; the single chip microcomputer is used for converting the filtered signals into digital signals of the weight and leading out the digital signals of the weight through an output lead.
The invention discloses a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system, wherein the weighing piezoelectric sensor comprises the following components: the device comprises a pressure conduction structure, a pre-tightening force clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit; weighing is realized through the pressure conduction structure, the pretightening force splint and the quartz piezoelectric crystal, the structure of the highway weighing system is simplified, and measured analog signals are converted into digital signals through the signal conditioning circuit to be transmitted, so that distortion in the signal transmission process is avoided, and the weighing precision is improved. The weighing piezoelectric sensor provided by the invention has the advantages that the structure of a highway weighing system is simplified, and the weighing precision is improved.
Example 2
Example 2 of the present invention provides a preferred embodiment of the piezoelectric load cell of the present invention.
The weighing piezoelectric sensor further comprises a shell 5, the pressure conduction structure 1, the pretightening force clamping plate 2, the quartz piezoelectric crystal 3 and the signal conditioning circuit 4 are sealed into a preset structure through hollow glass microsphere reinforced foam plastics 6, and the preset structure is arranged in the shell 5. The hollow glass microsphere reinforced foam plastic 6 is adhered to the periphery of the pressure conduction structure 1, the pretightening force clamping plate 2, the quartz piezoelectric crystal 3 and the signal conditioning circuit 4, is formed into a square shape and is finally placed into the shell 5, the material is an elastic material, the weight is light, and the structure can eliminate transverse vibration to a certain extent on the premise of not influencing the measurement of the vertical force by the sensor. The length of the shell 5 has various forms, 1000mm, 1500mm and 2000mm to adapt to different road surfaces. The preset structure is 200mm, and the sensors with different lengths can be freely combined according to actual needs. When the combination is carried out, the shells with different lengths can be stuffed with different numbers of preset structures. When the preset structure and the shell are buried in the ground, the weighing piezoelectric sensor has the characteristic of long service life due to the material characteristics and corrosion resistance of the sensor main body material and the good sealing property of the shell.
The weighing piezoelectric sensor further comprises a surface layer 7 made of concrete materials, and the surface layer 7 is laid on the upper surface of the pressure conduction structure.
The pressure conduction structure and the pre-tightening force clamping plate are made of light alloy, in particular 5052 aluminum alloy. The 5052 aluminum alloy is antirust aluminum, the tensile strength of the aluminum alloy is 173-244 MPa, the conditional yield strength is larger than or equal to 70MPa, and the elastic modulus is about 70 GPa. Compared with 1060 aluminum plate, in the case that 5052 series aluminum alloy is harder than 1060 series aluminum alloy by 100%, elongation is improved by about 200%. The 5052 aluminum alloy has high strength, particularly has the following fatigue strength: high plasticity and corrosion resistance, no heat treatment strengthening, good plasticity in semi-cold hardening, low plasticity in cold hardening, good corrosion resistance and good weldability. The requirements of the sensor on strength and fatigue resistance are met. The adoption of the aluminum alloy material avoids the gravity fatigue state of the quartz piezoelectric crystal after long-term use.
The invention also adopts hollow glass microsphere reinforced foam plastic to seal the pressure conduction structure, the pretightening force clamping plate, the quartz piezoelectric crystal and the signal conditioning circuit, and the sealed structure is placed in the shell, and the hollow glass microsphere reinforced foam plastic inhibits transverse vibration, thereby achieving the purpose of accurately measuring the vertical axle weight and improving the dustproof and waterproof performance.
The pressure conduction structure and the pre-tightening force clamping plate are made of light alloy materials, so that the weight of the weighing sensor is reduced, and the weighing sensor is convenient to install.
Example 3
Example 3 of the present invention provides another preferred embodiment of the piezoelectric load cell of the present invention.
The thickness of the surface layer 7 is 5mm, the width is 80mm, and the thickness of the AB glue is 1 mm; the height of the two quartz piezoelectric crystals 3 is 10mm, the width is 20mm, and the length is 200 mm; the thickness of the symmetrical pretightening force side plate 22 of the pretightening force clamping plate 2 is 5mm, and the length is 200 mm; the bottom plate 21 has a height of 10mm, a width of 100mm and a length of 200 mm; the width of the circuit board of the signal conditioning circuit 4 is 20mm, the diameter of the conduit 7 is 3mm, the height of the shell 5 is 88mm, and the width of the shell 5 is 106 mm.
Example 4
The preparation method comprises the following steps:
laying electrodes on the quartz piezoelectric crystal;
connecting the electrode with a signal conditioning circuit through a lead; and the signal conditioning circuit is close to the quartz piezoelectric crystal so as to reduce signal noise.
The two side plates of the pre-tightening force clamping plate are propped open by using a horizontal external force, and a quartz piezoelectric crystal, a signal conditioning circuit and a pressure conduction structure which are connected are put in;
the sensor main body clamps the pressure conduction structure, the quartz piezoelectric crystal and the bottom plate of the pre-tightening force clamping plate through the elastic force of the pre-tightening force clamping plate and applies a certain pre-tightening force.
Bonding hollow glass microsphere reinforced foam plastic on the outer side of the sensor main body, and sealing the sensor main body into a preset structure;
placing the preset structure in a shell;
when the preset structure and the shell are buried in the ground, the weighing piezoelectric sensor has the characteristic of long service life due to the material characteristics and corrosion resistance of the sensor main body material and the good sealing property of the shell.
Bonding hollow glass microsphere reinforced foam plastic on the outer side of the sensor main body, sealing the sensor main body into a preset structure, and further comprising the following steps:
and bonding a surface layer on the pressure conduction structure, wherein the coating between the surface layer and the pressure conduction structure is AB glue, and after the AB glue is coated on the pressure conduction structure, standing for 12 hours until the glue thickness is about 1 mm. After the glue is completely dried, the surface layer is placed on the AB glue and tamped.
When the sensor is installed, a long groove is cut on a flat road, the sensor is horizontally embedded, and a level gauge is used for calibration; after the grooves needed by the sensor are cut out, a groove with the width of about 5mm and the depth of 10mm needs to be cut out in the vertical direction of the running of the road vehicle for leading out the sensor lead and leading in the power line; after the position of the sensor is determined, the sensor is poured into a sensor groove and a lead groove which are cut on the road surface by using epoxy resin and quartz sand which are mixed according to a one-to-one ratio to serve as glue. After the sensor is buried in the ground groove, the level gauge is used for carrying out level calibration on the sensor surface layer and the road surface, and the sensor surface layer and the road surface are ensured to be on the same horizontal line. The sensor is allowed to be slightly higher than the road surface during installation, and the sensor surface layer is polished after the installation is completed until the sensor surface layer is leveled with the road surface.
Example 5
Embodiment 5 of the present invention provides a highway weighing system.
As shown in fig. 4, the weighing system includes: the system comprises a plurality of weighing piezoelectric sensors, cameras, an upper computer and a remote monitoring terminal;
the camera is connected with the upper computer and used for shooting license plate number information of vehicles entering the weighing area of the expressway and sending the license plate number information to the upper computer;
the plurality of weighing piezoelectric sensors are embedded on the ground of the highway weighing area side by side, output wires of the weighing piezoelectric sensors are led out through wire grooves on the ground of the highway weighing area, the weighing piezoelectric sensors are connected with the upper computer through the output wires, the weighing piezoelectric sensors are used for weighing digital signals of the weight of vehicles entering the highway weighing area, and the digital signals of the weight are sent to the upper computer;
the upper computer is connected with the remote monitoring terminal and is used for decoding the digital signal of the weight to obtain weight information of the vehicle, corresponding the license plate number information with the weight information of the vehicle to obtain weight information of the corresponding vehicle and sending the weight information of the corresponding vehicle to the remote monitoring terminal;
and the remote monitoring terminal is used for carrying out weight-metering charging and overweight violation management according to the weight information of the corresponding vehicle.
Example 6
Example 6 of the present invention provides a preferred embodiment of a highway weighing system.
The highway weighing system uses two groups of weighing piezoelectric sensors, the installation distance between the two groups of weighing piezoelectric sensors is fixed to be 20m, and the data measured by the two groups of weighing piezoelectric sensors are averaged, so that the accuracy of the measured data is further ensured. Because the sensor interval is fixed, when the vehicle passes through the second group of piezoelectric weighing sensors, the camera acts to shoot a vehicle picture and identify the license plate number, and the vehicle passing speed is displayed by testing the time that the first axle of the vehicle passes through the two groups of sensors.
The weighing piezoelectric sensor, the preparation method thereof and the highway weighing system have the advantages that:
compared with the traditional sensor which directly transmits the quartz piezoelectric signal, the built-in signal conditioning circuit of the weighing piezoelectric sensor provided by the invention integrates the signal conditioning circuit and the sensor together by utilizing the structural characteristics of the sensor, so that the digital signal is directly transmitted after the signal is processed inside, the anti-interference capability is greatly enhanced, and the harsh requirement on a signal transmission mode is greatly reduced.
The weighing piezoelectric sensor provided by the invention has low requirements on production processes, meets the requirements of domestic creation and domestic production, fixes the quartz piezoelectric crystal by using the elastic force of the pre-tightening force splint, enables the quartz piezoelectric crystal to work in an online deformation range, has a simple and reliable structure, and hardly influences the stress of the pre-tightening force splint.
The conventional highway weighing system has no good inhibition measure for transverse vibration when a vehicle passes through, and the structure of the weighing piezoelectric sensor provided by the invention can inhibit the transverse vibration to a great extent by utilizing the sensor structure and the hollow glass microsphere reinforced foam plastic, so that the aim of accurately measuring the vertical axle weight is fulfilled.
The weighing piezoelectric sensor provided by the invention is sealed in structure, dustproof and waterproof, insensitive to environmental change, capable of stably working in various environments, simple to use, long in service life, small in size and convenient to install.
The sensor provided by the invention has high precision, can accurately measure the axle load of a high-speed vehicle, can greatly improve the vehicle passing speed compared with the traditional weighing sensor, and reduces complaints caused by inaccurate charging.
The lead led out from the electrode plate on the quartz piezoelectric crystal adopts the shielding wire, so that a plurality of leads do not interfere with each other when transmitting piezoelectric signals in parallel, and the stability and the precision of output signals are ensured.
The quartz piezoelectric sensor structure provided by the invention has no screw, improves the stability and the service life, and reduces the installation cost and the use cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation manner of the present invention are explained by applying specific examples, the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof, the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Claims (6)
1. A piezoelectric weighing sensor, comprising:
the device comprises a pressure conduction structure, a pre-tightening force clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit;
the pre-tightening force clamping plate comprises a bottom plate and two symmetrical pre-tightening force side plates, the quartz piezoelectric crystal is arranged above the bottom plate, and the pressure conduction structure is clamped above the quartz piezoelectric crystal by the two symmetrical pre-tightening force side plates;
the quartz piezoelectric crystal is provided with an electrode, the quartz piezoelectric crystal is connected with the signal conditioning circuit through the electrode, and the quartz piezoelectric crystal is used for weighing an analog signal of the weight applied to the pressure conduction structure and sending the analog signal of the weight to the signal conditioning circuit;
the signal conditioning circuit is used for converting an analog signal of the weight output by the quartz piezoelectric crystal into a digital signal of the weight and leading out the digital signal of the weight through an output lead;
the pressure conduction structure comprises an upper layer structure, a middle layer structure and a lower layer structure, the upper layer structure is an isosceles trapezoid body, and the area of the upper surface of the upper layer structure is larger than that of the lower bottom surface of the upper layer structure; the middle layer structure is a cuboid with the upper surface and the lower bottom surface of the upper layer structure in the same shape, the lower layer structure is an isosceles trapezoid body with a rounded angle between the upper bottom surface and two side surfaces, the area of the upper surface of the lower layer structure is larger than that of the lower surface of the lower layer structure, the lower bottom surface of the upper layer structure is superposed with the upper surface of the middle layer structure, and the lower surface of the middle layer structure is superposed with the upper bottom surface of the lower layer structure;
two symmetrical pretightening force side plates of the pretightening force clamping plate are clamped at the included angle between the upper bottom surface and two side surfaces of the lower layer structure;
the quartz piezoelectric crystal is arranged between the lower bottom surface of the lower layer structure and the bottom plate of the pre-tightening force clamping plate.
2. The piezoelectric weighing sensor according to claim 1, wherein the signal conditioning circuit comprises a charge amplifier, an instrumentation amplifier, a filter and a single chip microcomputer;
the charge amplifier is respectively connected with the electrode of the quartz piezoelectric crystal and the instrument amplifier, and is used for amplifying the charge of the analog signal of the weight measured by the quartz piezoelectric crystal and sending the signal after the charge amplification to the instrument amplifier;
the instrument amplifier is connected with the filter and used for carrying out instrument amplification on the signal obtained after the charge amplification and sending the signal obtained after the instrument amplification to the filter;
the filter is connected with the singlechip and used for filtering the signal amplified by the instrument and sending the filtered signal to the singlechip;
the single chip microcomputer is used for converting the filtered signals into digital signals of the weight and leading out the digital signals of the weight through an output lead.
3. The piezoelectric weighing sensor according to claim 1, further comprising a housing, wherein the pressure conducting structure, the pre-tightening force clamping plate and the piezoelectric quartz crystal are sealed by hollow glass microsphere reinforced foam into a predetermined structure, and the predetermined structure is disposed in the housing.
4. The piezoelectric weighing sensor of claim 1, further comprising a facing layer of concrete material applied to an upper surface of the pressure conducting structure.
5. The piezoelectric weighing sensor of claim 1, wherein the pressure conducting structure and the pre-load clamp plate are made of lightweight alloy.
6. A highway weighing system, comprising: a plurality of the weighing piezoelectric sensors of any one of claims 1-5, a camera, an upper computer and a remote monitoring terminal;
the camera is connected with the upper computer and used for shooting license plate number information of vehicles entering the weighing area of the expressway and sending the license plate number information to the upper computer;
the plurality of weighing piezoelectric sensors are embedded on the ground of the highway weighing area side by side, output wires of the weighing piezoelectric sensors are led out through wire grooves of the ground of the highway weighing area, the weighing piezoelectric sensors are connected with the upper computer through the output wires, and the weighing piezoelectric sensors are used for weighing analog signals of the weight of vehicles entering the highway weighing area, converting the analog signals of the weight into digital signals of the weight and sending the digital signals to the upper computer;
the upper computer is connected with the remote monitoring terminal and is used for decoding the digital signal of the weight to obtain weight information of the vehicle, corresponding the license plate number information with the weight information of the vehicle to obtain weight information of the corresponding vehicle and sending the weight information of the corresponding vehicle to the remote monitoring terminal;
and the remote monitoring terminal is used for carrying out weight-metering charging and overweight violation management according to the weight information of the corresponding vehicle.
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| CN112113648B (en) * | 2019-06-20 | 2024-07-16 | 泰连公司 | Dynamic weighing sensor structure |
| WO2021068759A1 (en) * | 2019-10-09 | 2021-04-15 | 苏州泊讯物联网技术有限公司 | Rolling sensor device and signal processing method thereof |
| CN112304406B (en) * | 2020-10-28 | 2022-03-11 | 山东高速股份有限公司 | Self-powered detection device and detection method for road vehicle weighing |
| CN112781700A (en) * | 2020-12-30 | 2021-05-11 | 北京万集科技股份有限公司 | Dynamic weighing device and weighing method thereof |
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