Portable vehicle dynamic weighing sensor

Abstract

The utility model discloses a portable vehicle dynamic weighing sensor, which comprises a weighing platform and a cover plate, the weighing platform is a trapezoidal thin plate, a plurality of longitudinal through parallel dovetail grooves are designed on the weighing platform, a plurality of sensing units are uniformly arranged along the direction of the dovetail grooves, and the cover plate is arranged on the dovetail grooves. Therefore, the dynamic force applied to the vehicle tire can be comprehensively acquired and measured. The weighing platform and the cover plate are assembled by adopting a tenon-and-mortise structure, the shape of the cover plate is designed based on dovetail tenon-and-mortise, the section of the cover plate is a symmetrical trapezoid, and the center line of the cover plate is parallel to the surface of the weighing platform; the sensing unit comprises a quartz plate and a PVC pressing strip, the quartz plate is fixed in the PVC pressing strip, and the PVC pressing strip is assembled between the upper electrode and the lower electrode. The portable quartz vehicle dynamic weighing sensor provided by the utility model effectively solves the problems of unstable precision, poor sensitivity, complex installation and maintenance and the like of a dynamic weighing sensor in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model belongs to weighing sensor technical field, concretely relates to a vehicle dynamic weighing sensor. BACKGROUND

[0002] Traditional vehicle static weighing technology, such as a truck scale, although has high precision and repeatability, but it needs to park and stop vehicle or transport tool, and needs larger installation space and more complex infrastructure, increases the difficulty and cost of later maintenance, with the continuous development of society, especially in the increasingly busy traffic transportation industry and the increasing demand for real-time monitoring of traffic flow, traditional static weighing technology faces many limitations.

[0003] Dynamic weighing technology as an effective solution to the above problems has been widely used in various intelligent traffic management, overload detection, bridge load limit monitoring and other aspects in recent years. Dynamic weighing system can realize real-time weighing without stopping during high-speed driving of vehicle through embedding sensor array on road surface, greatly improves the traffic efficiency and avoids the interference to traffic flow. Dynamic weighing sensor can not only monitor the axle load and total weight of vehicle in real time, but also provide accurate weight data for various application scenarios such as overload detection, road weight charging and traffic safety management. Compared with traditional static weighing system, dynamic weighing system has the advantage of reducing traffic congestion, reducing transportation cost and improving the intelligent level of traffic management

[0004] At present, most of the dynamic weighing sensors on the market adopt long strip structure and are packaged by multiple sensitive units. However, the existing long strip dynamic weighing sensor has several problems. First, due to the long length of the sensor, the performance of different parts is easy to be inconsistent, resulting in increased weighing error. The core sensitive unit of the sensor is difficult to ensure its consistency in the manufacturing process due to the difference of manufacturers, materials and batches, which seriously affects the measurement accuracy of the sensor. Secondly, the existing dynamic weighing sensor has high construction cost and complex operation process during installation and maintenance. For example, the narrow strip weighing sensor needs to be embedded in the road surface by excavating the road surface, which not only increases the construction cost and workload, but also makes the later maintenance more complex and expensive.

[0005] Although this long strip dynamic weighing sensor can meet certain application requirements, it often has problems such as unstable precision and inconsistent data in actual operation. One of the main reasons is that it is difficult to ensure the performance consistency of different sensitive units in the manufacturing process of the sensor. Due to the influence of different manufacturers, material batches and production processes, the test performance of the same sensor at different parts is greatly different, which further affects the accuracy and consistency of the weighing data.

[0006] Therefore, how to optimize the structural design, improve the consistency, and realize more convenient, low-cost operation in installation and maintenance on the basis of ensuring high precision and high reliability of the weighing sensor has become an important challenge in the current research field. SUMMARY

[0007] The utility model discloses a portable vehicle dynamic weighing sensor, to solve the problem of dynamic weighing sensor precision instability, sensitive unit consistency is poor and installation and maintenance complex in prior art.

[0008] The specific solution provided by the utility model is as follows: a portable vehicle dynamic weighing sensor, comprising a sensing unit, a weighing platform and a cover plate, the weighing platform is a trapezoidal sheet, a plurality of longitudinal through parallel dovetail grooves are designed on the weighing platform, a plurality of sensing units are uniformly arranged along the dovetail groove direction to realize comprehensive collection and measurement of dynamic force applied to the vehicle tire.

[0009] The weighing platform and the cover plate are assembled by using a mortise and tenon structure, the cover plate cross section is a symmetrical trapezoid, and the center line is parallel to the surface of the weighing platform.

[0010] The sensing unit adopts a composite structure, comprising a quartz sheet, a PVC pressing strip, a nickel strip and an insulating strip, the quartz sheet is fixed in the PVC pressing strip, the PVC pressing strip is assembled between the upper electrode and the lower electrode, and the nickel strip and the insulating strip are arranged from top to bottom between the PVC pressing strip and the lower electrode.

[0011] Further, the width and spacing of the dovetail groove are parameterized designed according to the model and specification of the sensing unit to adapt to different application scenarios.

[0012] Further, the quartz sheets are fixed by a plastic positioning plate and are bonded in opposite polarization directions.

[0013] The utility model has the following beneficial effects:

[0014] 1. Uniform stress design: the design of the dovetail groove ensures uniform stress of the sensing unit during use, reduces stress concentration and edge effect, and improves the measurement accuracy and stability of the sensor.

[0015] 2. Enhanced sensitivity and accuracy: by using aluminum alloy material and precise dovetail groove design, the stress transmission is optimized, and the sensitivity and measurement accuracy of the sensor are improved.

[0016] 3. Improved reliability and service life: the design of the mortise and tenon structure improves the connection stability between the platform and the cover plate, reduces the structural looseness caused by vibration and external force, and significantly improves the long-term stability and service life of the sensor.

[0017] 4. Enhanced adaptability: through the parameterization optimization design of the dovetail groove and the sensing unit, the sensor can adapt to the weighing needs of vehicles of different models and specifications, and has a wider application prospect.

[0018] 5. Precise positioning and stability: the quartz piece is fixed through a precise plastic positioning plate, so that the sensing unit will not deviate during use, and the stability and precision of the sensor are improved.

[0019] In summary, the portable quartz vehicle dynamic weighing sensor has significant technical advantages in improving weighing precision, improving stability and prolonging service life, and can provide high-precision dynamic weighing data in various complex environments, and has a specific application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the portable vehicle dynamic weighing sensor of the utility model;

[0021] Figure 2 is an assembly partial view of the portable vehicle dynamic weighing sensor of the utility model;

[0022] Figure 3 is a top view of the portable vehicle dynamic weighing sensor of the utility model;

[0023] Figure 4 is Figure 3 is a cross-sectional view of the portable vehicle dynamic weighing sensor of the utility model along A-A direction;

[0024] Figure 5 is an enlarged view of the weighing platform of the portable vehicle dynamic weighing sensor of the utility model;

[0025] Figure 6 is an assembly relationship view of the piezoelectric sensing unit of the portable vehicle dynamic weighing sensor of the utility model;

[0026] In the drawings, the component names represented by each number are as follows:

[0027] 1, weighing platform; 2, cover plate; 3, upper electrode; 4, lower electrode; 5, PVC pressing strip; 6, nickel strip; 7, insulating strip. DETAILED DESCRIPTION

[0028] The content of the utility model will be further described in detail below in combination with the drawings.

[0029] Referring to Figure 1 and Figure 2The utility model provides a portable quartz vehicle dynamic weighing sensor, including weighing platform 1, weighing platform 1 is 7075 aluminum alloy material, and the Young's modulus is small, and it usually shows better bending performance, can better transmit stress to piezoelectric sheet, thereby improving the sensitivity of sensor, cover plate 2 is trapezoidal thin plate structure, and three longitudinal through parallel dovetail groove is designed on weighing platform 1, and the dovetail groove is used to install sensing unit.

[0030] Referring to Figure 2 , the dovetail groove on the weighing platform 1 adopts a symmetrical trapezoidal cross-section, with the center line parallel to the platform surface, ensuring the uniformity of the stress of the sensing unit in the dovetail groove, which can effectively reduce stress concentration and edge effect.

[0031] The two sides of the weighing platform 1 are chamfered, further improving the mechanical properties and aesthetics of the weighing platform.

[0032] The weighing platform 1 is made of aluminum alloy material, and by using aluminum alloy material, the Young's modulus of the weighing platform is smaller, which helps to better transmit the applied stress to the quartz sheet, thereby improving the sensitivity and accuracy of the sensor.

[0033] Referring to Figure 3 , the design position and size of the dovetail groove are accurately calculated to ensure the uniformity and stability of the stress of the sensing unit, improve the local stiffness, and reduce the total weight of the platform.

[0034] The width and spacing of the dovetail groove are accurately parameterized designed according to the type and specification of the sensing unit to adapt to the installation requirements of different types of sensing units, improving the universality and adaptability of the platform.

[0035] The design of the dovetail groove and its cooperation with the sensing unit effectively ensure the uniform stress of the sensing unit, reduce stress concentration, and thereby improve the sensitivity and stability of the weighing sensor.

[0036] Referring to Figure 2 , Figure 4 and Figure 6 , the sensing unit adopts a composite structure, including a quartz sheet, a PVC pressing strip 5, a nickel strip 6, and an insulating strip 7. The quartz sheet is fixed in the PVC pressing strip 5, and the PVC pressing strip 5 is assembled between the upper electrode 3 and the lower electrode 4.

[0037] The upper electrode 3 and the lower electrode 4 are both made of manganese steel, and the quartz sheets are fixed by a plastic positioning plate and bonded in opposite polarization directions.

[0038] The quartz sheet is fixed by the PVC pressure strip 5 to ensure that the quartz sheet can uniformly generate electric charge under the piezoelectric effect, and the stable position of the quartz sheet is ensured by the plastic positioning plate to avoid deviation caused by long-term use or frequent pressure, thereby improving the accuracy and long-term stability of the sensor. The quartz sheet uses its excellent piezoelectric properties to convert the applied mechanical force into an electric charge signal output, which has high sensitivity, wide frequency response, low hysteresis, etc., and is suitable for dynamic force measurement.

[0039] A nickel strip 6 and an insulating strip 7 are provided between the PVC pressure strip 5 and the lower electrode 4 from top to bottom. The nickel strip, as an electrode material, has good electrical conductivity and corrosion resistance, and has a similar thermal expansion coefficient with the quartz sheet, which can reduce the error caused by temperature change and ensure the stability of the sensor during dynamic weighing. The insulating strip uses a polyimide film to ensure electrical isolation and prevent electrical leakage, protecting the safety of the sensor.

[0040] Referring to Figure 2 , the weighing platform 1 and the cover plate 2 are connected by a precisely fitted mortise and tenon structure, and the shape of the cover plate 2 is designed based on a dovetail, with a symmetrical trapezoidal cross-section. This design ensures that the stress on the sensing unit in the dovetail groove is uniform, avoiding deviation caused by stress concentration. The mortise and tenon structure is a precise fit, ensuring a tight connection between the weighing platform 1 and the cover plate 2, avoiding deviation caused by uneven force transmission of the sensing unit, thereby improving the stability and long-term reliability of the sensor. The mortise and tenon structure ensures effective force transmission between the weighing platform 1 and the cover plate 2, reducing connection looseness caused by vibration or external force, thereby improving the anti-interference ability and long-term working stability of the sensor.

[0041] Referring to Figure 1 and Figure 3 , multiple sensing units are evenly arranged along the dovetail groove direction to ensure that the dynamic force applied to the vehicle tire can be fully collected and measured. Through this design, the sensitivity of the sensor is improved, and the quartz sheet does not deviate during use, thereby enhancing the long-term stability of the sensor. The arrangement of the sensing units is optimized to achieve the best measurement performance and space utilization, adapting to different types of vehicle weighing needs.

[0042] The weighing platform 1 and the cover plate 2 are assembled by a special clamp to ensure the stability of the connection between the platform and the cover plate, avoiding connection looseness caused by vibration or external force, thereby improving the anti-interference ability and working stability of the sensor.

[0043] The utility model discloses a portable quartz vehicle dynamic weighing sensor through accurate design's dovetail groove, mortise and tenon structure and high -performance quartz dynamic force sensing unit, the portable quartz vehicle dynamic weighing sensor of the utility model effectively solved the dynamic weighing sensor precision unstable, poor sensitivity, installation and maintenance complex etc. of prior art. Through optimization material selection and structure design, this sensor guarantees high -precision measurement while further improving stability, reliability and applicability, has the wide application prospect.

Claims

1. A portable vehicle dynamic weighing sensor, characterized in that, It includes a sensing unit, a weighing platform (1) and a cover plate (2). The weighing platform (1) is a trapezoidal thin plate. Multiple longitudinal parallel dovetail grooves are designed on the weighing platform (1). Multiple sensing units are evenly arranged along the direction of the dovetail grooves to realize the comprehensive collection and measurement of the dynamic force applied to the vehicle tires. The weighing platform (1) and the cover plate (2) are assembled using a mortise and tenon structure. The cover plate (2) has a symmetrical trapezoidal cross section, and its center line is parallel to the surface of the weighing platform. The sensing unit adopts a composite structure, including a quartz plate, a PVC strip (5), a nickel strip (6), and an insulating strip (7). The quartz plate is fixed in the PVC strip (5), and the PVC strip (5) is assembled between the upper electrode (3) and the lower electrode (4). The nickel strip (6) and the insulating strip (7) are arranged from top to bottom between the PVC strip (5) and the lower electrode (4).

2. The portable vehicle dynamic weighing sensor as described in claim 1, characterized in that, The width and spacing of the dovetail grooves are parametrically designed according to the model and specifications of the sensing unit to adapt to different application scenarios.

3. The portable vehicle dynamic weighing sensor as described in claim 1, characterized in that, The quartz plates are fixed together by plastic positioning plates and bonded together in opposite polarization directions.

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