A road vehicle dynamic weighing device

Abstract

The present application discloses a road vehicle dynamic weighing device, which relates to the technical field of road weighing equipment, including a weighing sensor, a data acquisition device, and a weighing meter; the weighing sensor is buried in an upper base layer and the force measuring surface of the weighing sensor and the surface of the upper base layer are located in the same plane; the weighing sensor is composed of a plurality of weighing units spliced ​​and assembled in sequence; the weighing unit comprises a lower bearing plate, a round-shaped pressure tube, a pressure sensor built in the round-shaped pressure tube, a cable, an upper bearing plate, and a second bearing plate; the round-shaped pressure tube is a tube body bent into a round shape, arranged horizontally, and fixed on the lower bearing plate; the upper bearing plate is a hard rectangular plate, fixed on the top of the round-shaped pressure tube; the second bearing plate is a hard plate body, covering and fixed on the upper bearing plate; the technical effect of ensuring the measurement accuracy and service life, the road vehicle dynamic weighing device has high installation efficiency, no road reconstruction is required during installation, and little impact on road traffic is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of road weighing equipment, and in particular to a dynamic weighing device for road vehicles. Background Art

[0002] In order to control the overload of freight vehicles, the total weight of freight vehicles on the road must be measured. National highways adopt "overload persuasion at the entrance" and "export weighing and double verification" to combat overloaded transportation; ordinary roads generally adopt a combination of highway overload inspection stations (referred to as overload control station mode) and scientific and technological overload control non-stop inspection (referred to as non-site law enforcement mode). On the basis of the existing fixed overload inspection stations on highways, a non-stop inspection system for ordinary roads is built to form a scientific and technological overload control network.

[0003] There are currently two main types of road vehicle weighing: static weighing and dynamic weighing.

[0004] Static weighing generally involves allowing suspected overweight vehicles to enter a fixed weighing station (point / lane) for vehicle weighing. Static weighing has high detection accuracy, but low test efficiency and can easily cause traffic jams.

[0005] Dynamic weighing is generally used to measure the vehicle axle weight through a load cell installed on the road surface during the normal driving of the vehicle, thereby calculating the total weight of the truck. Compared with static weighing, dynamic weighing has the characteristics of small load cell size, low construction difficulty, high detection efficiency, and wide detection speed range. It is widely used in large quantities to dynamically detect freight vehicles on highways and ordinary roads.

[0006] The dynamic weighing equipment with relatively mature technology and wide application in the market is divided into weighing sensors, mainly including quartz crystal type, bent plate type, narrow strip type, flat plate type and other products with a wide measuring speed range, as well as quasi-dynamic (measuring speed range 0 ~ 20km / h, only used for "entrance dissuasion" and "exit review" in highway toll stations) weighing table type, axle group type and vehicle type.

[0007] The dynamic weighing equipment currently on the market, whether it is quartz type, narrow strip type, curved plate type, or flat plate type, its load cell installation area and the approach road pavement at both ends are also extremely important components of the dynamic weighing system. Most of the detected vehicles stay on the road surface at both ends of the carrier. Therefore, the load cell installation area and the approach road pavement at both ends must be stable, durable, straight, and on the same plane, otherwise it will inevitably lead to increased weighing errors.

[0008] However, most of the domestic highways are asphalt concrete pavements, which are flexible and not hard enough. In addition, a large number of overloaded vehicles are rolling over them for a long time, which makes the road surface prone to longitudinal and lateral deformation, local bulges or potholes. This causes the vehicle to vibrate when passing the weighing sensor, generating additional vibration loads (vertical impact force), which distorts the vehicle's weighing data (such as Fig.15 and Fig.16 As shown); and the higher the vehicle speed, the greater the vibration load, and the more serious the distortion of the vehicle weighing data. Therefore, strictly speaking, the above-mentioned dynamic weighing equipment cannot be directly installed on asphalt concrete pavement. The asphalt concrete pavement must be transformed into cement concrete pavement in order to accurately measure for a long time.

[0009] If the asphalt pavement is converted into cement concrete pavement and then installed, there are common problems:

[0010] 1. The renovation cost is high. The cement concrete pavement is generally required to be no less than 25 meters, and some areas even require it to be 90 meters. The average renovation cost of each lane is about 100,000 yuan;

[0011] 2. Potholes and grooves are easily formed at the intersection of cement concrete pavement and asphalt pavement, and the two pavement colors are different, which affects the overall appearance of the road;

[0012] 3. The construction time is long. The renovation time plus the concrete curing time takes about 15 days, which affects the traffic, especially the nodes with heavy traffic flow;

[0013] 4. Once the weighing sensor is damaged, it is difficult to replace the excavator and it is easy to cause further damage to the weighing sensor. Summary of the invention

[0014] The embodiment of the present application provides a dynamic weighing device for road vehicles, which solves the technical problems in the prior art that the road surface needs to be reconstructed during the installation process of the dynamic weighing device for road vehicles, the modification cost is high, the aesthetic integration of the road is affected, and the cement concrete maintenance time is long and seriously affects the road traffic; the embodiment of the present application achieves the technical effect that the dynamic weighing device for road vehicles has high installation efficiency, no road modification is required during installation, and the impact on road traffic is small while ensuring the measurement accuracy and service life.

[0015] The embodiment of the present application provides a road vehicle dynamic weighing device, including a weighing sensor, a data acquisition device, and a weighing instrument; the weighing sensor is buried in an upper base layer, and the force measuring surface of the weighing sensor and the surface of the upper base layer are located in the same plane;

[0016] The weighing sensor is composed of a plurality of weighing units which are sequentially spliced ​​together; after the plurality of weighing units are combined, they are spliced ​​together into a long rectangle;

[0017] The weighing unit is in the shape of a rectangular block as a whole, and includes a lower bearing plate, a round pressure tube, a MEMS pressure sensor built in the round pressure tube, a cable, an upper bearing plate and a second bearing plate;

[0018] The lower bearing plates are hard rectangular plates, and adjacent lower bearing plates are nested together;

[0019] The zigzag pressure tube is a tube body bent into a zigzag shape, filled with liquid oil, arranged horizontally, and fixed on the lower bearing plate; the cable electrically connects the MEMS pressure sensor to the data acquisition device;

[0020] The upper bearing plate is a hard rectangular plate, fixed on the top of the round-shaped pressure tube and covers the round-shaped pressure tube;

[0021] The second bearing plate is a hard plate body, the bottom surface area of ​​which is the same as the top surface area of ​​the upper bearing plate, and covers and is fixed on the upper bearing plate.

[0022] Preferably, the material of the circular pressure tube is stainless steel or titanium aluminum alloy.

[0023] Preferably, a plurality of splicing combination holes and grooves for splicing are provided at the edge position in the length direction of the lower bearing plate;

[0024] Adjacent lower bearing plates can be nested together through these grooves and fixed together by bolts through the splicing combination holes;

[0025] The length direction of the lower bearing plate is perpendicular to the length direction of the entire weighing unit.

[0026] Preferably, the second bearing plate is placed on the upper bearing plate; the second bearing plate is made of grindable material and is polished on site during installation to ensure that the surface of the weighing unit and the surface of the upper base layer of asphalt concrete are on the same plane so that the tire dynamic force exerted on the weighing unit is transmitted to the return pressure tube.

[0027] Preferably, the weighing sensor further comprises a bottom bearing unit;

[0028] The bottom bearing unit comprises a bottom box and a floating plate;

[0029] The bottom box is a rectangular box body made of metal;

[0030] The floating plate is a rectangular hard plate body, which is placed on the bottom box and can be placed in the bottom box; the inner bottom area of ​​the bottom box is the same as the area of ​​the floating plate;

[0031] The floating plate is evenly distributed with more than 6 threaded holes near the edge, and the threaded holes are threaded holes for jacking bolts to penetrate;

[0032] The length of the jacking bolt is greater than the depth of the bottom box, and the bottom always contacts the inner bottom of the bottom box. When the jacking bolt rotates, the floating plate is driven to move up and down.

[0033] Preferably, the floating plate is also provided with a grouting hole for grouting and an exhaust hole for exhausting air and judging the completion of grouting at a position close to the edge;

[0034] The grouting hole and the exhaust hole are both through holes, and both are equipped with plugs for plugging the holes;

[0035] The lower bearing plate is fixed on the upper surface of the floating plate.

[0036] Preferably, the weighing unit can be pre-assembled on the floating plate before deployment, thereby saving installation and deployment time at the work site.

[0037] Preferably, the weighing sensor further comprises an upper cover enclosure;

[0038] The upper cover enclosure comprises a top soft plate, a rubber sleeve and a fixing frame plate for fixing the rubber sleeve on the floating plate;

[0039] After the upper cover enclosure is assembled, it covers the entire row of weighing units;

[0040] The top soft plate is a metal thin plate, which is placed on the second supporting plate and has a bottom area equal to the top surface area of ​​the second supporting plate;

[0041] The rubber sleeve is an annular rubber tube, arranged longitudinally, and its length before expansion is 1 to 3 cm greater than the height of the weighing unit;

[0042] The top edge of the rubber sleeve is fixed to the edge of the top soft plate, and the bottom is fixed to the floating plate through a fixed frame plate;

[0043] The fixed frame plate is a slot-shaped plate body, which is fixed to the floating plate by bolts and the bottom edge of the rubber sleeve is fixed to the floating plate by extrusion;

[0044] The floating plate, the rubber sleeve and the top soft plate together form a rectangular block space;

[0045] The rubber sleeve is provided with an air injection hole, and an air stop valve is fixed on the air injection hole;

[0046] The rubber sleeve is also provided with one or more cable holes for the cables to pass through, and a penetration tube is fixed on the cable hole to prevent air leakage in the rectangular block space;

[0047] The penetration tube is made of rubber, and the inner wall is closely attached to the surface of the cable.

[0048] Preferably, the weighing unit of the weighing sensor is covered by an upper cover enclosure before leaving the factory, thereby reducing the risk of the weighing unit being contaminated by water vapor and dust.

[0049] Preferably, the upper cover enclosure of the weighing sensor is in an expanded state during transportation.

[0050] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0051] By providing an embedded dynamic weighing equipment, which is directly buried in the flexible pavement (asphalt concrete pavement), there is no need for pavement reconstruction during installation; under the premise of ensuring measurement accuracy, the project construction period is shortened, the beauty and consistency of the road are maintained, and the project construction cost is saved; the technical problems in the prior art that the road vehicle dynamic weighing device needs to be reconstructed during installation and the long cement concrete maintenance time seriously affects road traffic are effectively solved; thereby achieving the technical effects of high installation efficiency of the road vehicle dynamic weighing device, no need for road reconstruction during installation, little impact on road traffic, full sealing without drainage, and no need for road occupation for after-sales service while ensuring measurement accuracy and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the appearance structure of the weighing unit of the dynamic weighing device for road vehicles of the present invention;

[0053] Figure 2 It is a schematic structural diagram of the lower bearing plate of the weighing unit of the dynamic weighing device for road vehicles of the present invention;

[0054] Figure 3 It is a schematic side structural diagram of a weighing unit of a dynamic weighing device for road vehicles of the present invention;

[0055] Figure 4 It is a schematic diagram of the appearance structure of the weighing units of the dynamic weighing device for road vehicles of the present invention after being assembled;

[0056] Figure 5 It is a schematic diagram of the appearance structure of the bottom load-bearing unit of the dynamic weighing device for road vehicles of the present invention;

[0057] Figure 6 It is a schematic diagram of the positional relationship between the bottom box, the floating plate and the threaded hole of the dynamic weighing device for road vehicles of the present invention;

[0058] Figure 7 It is a structural exploded diagram of the bottom bearing unit of the dynamic weighing device for road vehicles of the present invention;

[0059] Figure 8 It is a schematic diagram of the positional relationship between the upper cover closing body and the bottom bearing unit of the dynamic weighing device for road vehicles of the present invention;

[0060] Fig. 9 It is a partial structural schematic diagram of the upper cover enclosure of the road vehicle dynamic weighing device of the present invention;

[0061] Fig.10 It is a structural schematic diagram of a fixed frame plate of a dynamic weighing device for road vehicles of the present invention;

[0062] Fig.11 A schematic diagram of the positional relationship between the fixed frame plate and the bottom bearing unit of the road vehicle dynamic weighing device of the present invention;

[0063] Fig.12 It is a schematic diagram of the bottom structure of the upper cover enclosure of the dynamic weighing device for road vehicles of the present invention;

[0064] Fig.13 A schematic diagram of the internal structure of the penetration tube of the dynamic weighing device for road vehicles of the present invention;

[0065] Fig.14 It is a schematic diagram of road layering;

[0066] Fig.15 The force condition of the wheel impacting the load cell on the convex deformed asphalt concrete pavement;

[0067] Fig.16 The force condition of the wheel impacting the load cell on the concave deformed asphalt concrete pavement;

[0068] Fig.17 This is a schematic diagram of the installation layout of the submersible MEMS weighing sensor;

[0069] Fig.18 Schematic diagram of the voltage signal uploaded by the MEMS sensor.

[0070] In the figure:

[0071] Weighing unit 100, lower bearing plate 110, splicing combination hole 111, circular pressure tube 120, cable 130, upper bearing plate 140, second bearing plate 150, bottom bearing unit 200, bottom box 210, lifting hole 211, floating plate 220, threaded hole 221, grouting hole 222, exhaust hole 223, lifting bolt 224, upper cover closure body 300, top soft plate 310, rubber sleeve 320, air injection hole 321, air stop valve 322, cable hole 323, penetration pipe 324, fixed frame plate 325. DETAILED DESCRIPTION

[0072] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0073] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0075] The road vehicle dynamic weighing device of the present application includes a weighing sensor, a data acquisition device, and a weighing instrument; the present application provides a buried dynamic weighing device that can be directly buried in a flexible pavement (asphalt concrete pavement) and does not require pavement reconstruction during construction; that is, it shortens the project construction period, maintains the beauty and consistency of the road, and saves project construction costs; and achieves the technical effect that the road vehicle dynamic weighing device has high installation efficiency, does not require road reconstruction during installation, and has little impact on road traffic while ensuring measurement accuracy and service life.

[0076] Embodiment 1

[0077] The road vehicle dynamic weighing device of the present application includes a weighing sensor, a data acquisition device, and a weighing meter (central control machine); the weighing sensor is buried in the approach road of the weighing area, perpendicular to the driving direction of the vehicle; when the wheel rolls over the weighing sensor, the dynamic wheel force is applied to the surface of the weighing sensor and the approach road surface, and the MEMS pressure sensor in the weighing sensor generates a voltage signal proportional to the dynamic wheel force it bears; the signal is transmitted to the data acquisition device through a cable, and the data acquisition device filters and samples the voltage signal (analog signal) into a digital signal, which is sent to the weighing meter through a cable; the microprocessor calculates the wheel weight and axle weight according to a predetermined mathematical model, and then obtains the total vehicle weight by accumulating the axle weights and displays it; the signal processing process is:

[0078] Force → Voltage → Number (calculated) → Weight;

[0079] like Fig.14As shown, the structural layers of an asphalt concrete pavement generally consist of a surface layer, a base layer, and a cushion layer; the surface layer is further divided into a wear layer, an upper surface layer, a lower surface layer, and a bonding layer; the base layer is further divided into an upper base layer and a subbase layer; usually, the cushion layer is crushed stone, the subbase layer is cement-stabilized soil, the upper base layer is cement-stabilized crushed stone (cement concrete), the lower surface layer is low-grade asphalt concrete, and the upper surface layer is a modified asphalt concrete surface layer; the surface layer is a flexible asphalt (elastic) pavement, which will exhibit significant nonlinear change characteristics with changes in temperature and load; therefore, the present application buries the weighing sensor in the upper base layer of the asphalt concrete and makes the force measuring surface of the weighing sensor and the surface of the upper base layer in the same plane (so that the weighing data can be calculated using the linear elastic layered system theory to ensure the rationality of the pavement mechanics analysis).

[0080] Since the vehicle load tire contacts the road surface with an area, it is assumed that the vehicle load is a circular uniformly distributed load, and the radius of the circular area of ​​the wheel load contacting the road surface is a, that is:

[0081] P=π(htgθ+a) 2 q

[0082]

[0083] Where: q is the load on the upper base

[0084] P concentrated load (dynamic wheel force of vehicle)

[0085] θThe distribution angle of the vehicle load in the asphalt surface layer (asphalt layer) and the vertical direction

[0086] h Height from asphalt concrete pavement to asphalt concrete upper base

[0087] like Figures 1 to 4 As shown, the weighing sensor is a hydraulic MEMS pressure sensor, which is composed of a plurality of weighing units 100 spliced ​​and combined in sequence; the plurality of weighing units 100 are spliced ​​into a long rectangle after being combined, and the length direction after splicing is the same as the road width direction;

[0088] The weighing unit 100 is in a rectangular block shape as a whole, and includes a lower bearing plate 110, a round pressure tube 120, a MEMS pressure sensor built in the round pressure tube 120, a cable 130, an upper bearing plate 140 and a second bearing plate 150;

[0089] The lower bearing plate 110 is a hard rectangular plate, which plays a bearing role. A plurality of splicing combination holes 111 and grooves for splicing are provided at the edge position in the length direction; the adjacent lower bearing plates 110 can be nested together through these grooves, and can be assembled and fixed together through the splicing combination holes 111 by bolts; the length direction of the lower bearing plate 110 is perpendicular to the length direction of the entire weighing unit 100;

[0090] The meandering pressure tube 120 is a tube body bent into a U-shape, which is arranged transversely and fixed on the lower bearing plate 110; the outer contour of the meandering pressure tube 120 is similar in shape and size to the contour of the lower bearing plate 110; the meandering pressure tube 120 is made of elastic material, and the material is preferably stainless steel or titanium aluminum alloy or copper alloy, which has a certain bending elasticity and can restore to its original shape after being stressed; when under pressure, the hydraulic pressure is transmitted to the built-in MEMS pressure sensor through silicone oil or other mineral oil; when the pressure increases, the meandering pressure tube 120 will deform, resulting in changes in the hydraulic pressure in the tube, and the MEMS pressure sensor converts the detected hydraulic pressure into a voltage signal; the meandering pressure tube 120 is fully sealed, corrosion-resistant, high-temperature-resistant, and high-pressure-resistant, and can work stably and reliably in harsh working environments; it has high precision and reliability, and the accuracy and stability of the measurement results are good;

[0091] The cable 130 electrically connects the pressure sensor to the data acquisition device;

[0092] The upper bearing plate 140 is a hard rectangular plate, which plays a role of guiding force. Its shape and size are similar to those of the lower bearing plate 110. It is fixed on the top of the round-shaped pressure tube 120 and covers the round-shaped pressure tube 120.

[0093] The second bearing plate 150 is a hard plate body, the bottom surface area of ​​which is the same as the top surface area of ​​the upper bearing plate 140 , and is covered and fixed on the upper bearing plate 140 , and is in direct contact with the road material.

[0094] Preferably, the second bearing plate 150 is placed on the upper bearing plate 140 and polished on site during installation to ensure that the surface of the weighing unit and the surface of the upper base layer (concrete layer) of the asphalt concrete are on the same plane so that all the tire dynamic forces acting on the weighing unit are transmitted to the return pressure tube.

[0095] Preferably, the space enclosed by the meandering pressure tube 120 , the lower carrying plate 110 and the upper carrying plate 140 is filled with a polymer foam sealing material.

[0096] Preferably, the upper supporting plate 140 and the second supporting plate 150 are wrapped with a polymer tape of about 1 mm thick on all sides to offset the lateral stress between two adjacent weighing units.

[0097] For the convenience of description, a weighing sensor composed of a row of weighing units 10 is defined as a weighing body;

[0098] Preferably, in order to ensure the accuracy of the measured data, one lane contains two rows of weighing bodies;

[0099] like Fig.17As shown, it can be spliced ​​according to the actual width of the lane on site (common lane widths are 3.25 meters, 3.5 meters, 3.75 meters, 4 meters, 4.25 meters, and 4.5 meters) to achieve full coverage without omissions; during installation, the two weighing bodies are arranged alternately front and back on the left and right sides of the center line of the lane;

[0100] Logically, two adjacent weighing bodies are considered as one lane (for example, Fig.17 The vehicle has two one-way lanes, which can be regarded as three lanes logically), and the dynamic forces of the tires on both sides of the same axle of the vehicle are measured respectively, so as to effectively determine abnormal driving behaviors such as vehicle crossing lanes, large slanting, and multiple vehicles driving in parallel, and ensure the detection accuracy; the driving speed of the vehicle when passing through the detection area can be obtained by using the time difference between the wheels of the same axle reaching two adjacent weighing bodies and the distance of the weighing bodies in the forward direction of the vehicle; the wheelbase of the vehicle is obtained by using the time difference between the front and rear wheels reaching the same weighing body and the measured driving speed; the vehicle type classification is obtained by using the number of columns of the weighing units 100 in the weighing body rolled over by the wheels (the tire width of the detection vehicle) and the number of times the vehicle rolls over the same weighing body (the number of axles of the detection vehicle).

[0101] The following algorithm is used to calculate the total weight of the vehicle and cargo:

[0102] When a vehicle runs over the weighing body, under the action of the dynamic wheel force, the circular pressure tube of the weighing unit 100 that is rolled over is slightly deformed, and the hydraulic pressure in the tube increases. By utilizing the linear relationship between the liquid pressure and the dynamic wheel force of the vehicle, when the weighing unit 100 is acted upon by the dynamic wheel force, a voltage signal proportional to the dynamic wheel force is generated, or the MEMS pressure sensor has converted the voltage signal into a digital signal.

[0103] After each axle tire has completely passed through the weighing unit 100 module, the voltage signal uploaded by the weighing unit 100 is as follows: Fig.18 As shown in the figure:

[0104] V th :Threshold level

[0105] x(t): MEMS sensor output voltage

[0106] b(t): Idle speed level

[0107] t1, t2: The time when the wheel enters and leaves the MEMS sensor module

[0108] Δt: is a constant proportional to the threshold

[0109] The voltage signal / digital signal generated by each weighing unit 100 is sent to the data acquisition device, which collects, performs analog / digital conversion (no conversion is required for digital signals), analyzes, processes, and calculates the measured original voltage signal of each weighing unit 100; the calculation formula is as follows:

[0110]

[0111] Where: G is the dynamic wheel force acting on the weighing unit 100

[0112] K is a calibration factor, which is determined during commissioning using a check vehicle with known axle load.

[0113] V The speed of the vehicle passing the weighing body

[0114] L is the length of the weighing unit 100 along the vehicle travel direction (i.e. the width of the weighing unit 100)

[0115] x i The voltage value measured at the i-th time

[0116] bi The idling speed value measured for the i-th time

[0117] n is the number of measurements, and the calculation formula is as follows:

[0118]

[0119] T L The response time of the MEMS pressure sensor is

[0120] The voltage signal generated by each weighing unit 100 in the weighing body is sent to the data acquisition device, which collects, summarizes, analyzes and processes the original data of all weighing units 100 of the entire weighing body to obtain the unilateral dynamic wheel force of the vehicle axle. The dynamic wheel forces detected by the two weighing bodies are added together to obtain the weight of each wheel of the vehicle. The weight of each wheel of the vehicle is added together to obtain the total weight of the vehicle, completing the weighing process of a vehicle.

[0121] Therefore, the road vehicle dynamic weighing device of the present application can detect the vehicle's wheel weight, vehicle axle weight, vehicle gross weight, total number of wheels, vehicle model classification, and driving speed (speed of each axle, average speed of the entire vehicle, acceleration and deceleration).

[0122] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0123] The dynamic weighing device for road vehicles of the present application is buried in the asphalt concrete road, has a small deformation, a simple structure, no need for drainage, no maintenance, strong concealment, and does not affect the friction coefficient of the road surface; it solves the technical problems in the prior art that the road surface needs to be reconstructed during the installation process of the dynamic weighing device for road vehicles, and the long waiting time for cement solidification due to its own structure will seriously affect traffic; it achieves the technical effect of high installation efficiency of the dynamic weighing device for road vehicles, no need for road reconstruction during installation, and little impact on road traffic while ensuring measurement accuracy and service life.

[0124] The dynamic weighing device for road vehicles in this application is small in size, light in weight, quick to install, does not require road surface modification, and has stable and reliable performance;

[0125] The road vehicle dynamic weighing device of the present application can be used for both static and dynamic measurements;

[0126] The MEMS pressure sensor has a built-in temperature sensor and a temperature compensation circuit to ensure that the detection accuracy of the embeddable MEMS dynamic weighing equipment is not affected by the ambient temperature; the MEMS pressure sensor has high sensitivity and accuracy, and the measurement error is less than 1%; the dynamic weighing device for road vehicles in this application has a large operating temperature range (-45°C to 80°C), and can be used in harsh environments such as ultra-high temperature and ultra-low temperature; the dynamic weighing device for road vehicles in this application has a wide range of applications and can be applied to various complex road environments, such as bridges, ramps, curves, ramps, etc.; the dynamic weighing device for road vehicles in this application has a short construction time, with a construction period of only 1 day for each lane, and has little impact on road traffic.

[0127] Embodiment 2

[0128] Considering that when the scheme in the above embodiment is laid out on the road, in order to bury the weighing sensor in the upper base layer and make the force measuring surface of the weighing sensor and the surface of the upper base layer be in the same plane, it is generally necessary to excavate the road according to the depth and then perform leveling for many times. It is difficult to dig to the required depth during the laying process, and it is easy to dig too deep and thus destroy the original state of the road layer used to carry the weighing sensor; after digging deep, the bottom of the excavated groove needs to be raised; the process is cumbersome and time-consuming and labor-intensive, which is not conducive to the efficient installation work; in view of the above problems, and in order to extend the service life of the weighing sensor and reduce the settlement and settlement difference of different weighing units 100 after long-term use, as Figures 5 to 7 As shown, the embodiment of the present application adds a bottom bearing unit 200 on the basis of the above embodiment; specifically:

[0129] The bottom bearing unit 200 includes a bottom box 210 and a floating plate 220;

[0130] The bottom box 210 is a rectangular box made of metal material, which plays a bearing role;

[0131] The floating plate 220 is a rectangular hard plate, which is placed on the bottom box 210 and can be placed in the bottom box 210; the inner bottom area of ​​the bottom box 210 is the same as or similar to the area of ​​the floating plate 220;

[0132] The floating plate 220 is evenly distributed with more than 6 threaded holes 221 near the edge thereof, and the threaded holes 221 are threaded holes for inserting jacking bolts 224; the length of the jacking bolts 224 is greater than the depth of the bottom box 210, and the bottom thereof always contacts the inner bottom of the bottom box 210, and when the jacking bolts 224 rotate, the floating plate 220 is driven to move up and down;

[0133] The floating plate 220 is also provided with a grouting hole 222 for grouting and an exhaust hole 223 for exhausting and judging the completion of grouting near the edge; the grouting hole 222 and the exhaust hole 223 are both through holes, and both are equipped with plugs for plugging the holes;

[0134] The lower bearing plate 110 is fixed on the upper surface of the floating plate 220 .

[0135] In actual use, after digging a groove on the road for placing the weighing sensor, the bottom bearing unit 200 is placed in the groove and the height of the weighing unit 100 is adjusted by adjusting the rotation of the jacking bolt 224, and then grouting is performed in the space formed by the bottom box 210 and the floating plate 220.

[0136] Preferably, the weighing unit 100 can be pre-assembled on the floating plate 220 before deployment, so as to save installation and deployment time at the work site.

[0137] Preferably, a plurality of lifting holes 211 for assisting lifting are provided on the side wall of the bottom box 210 .

[0138] Embodiment 3

[0139] In order to ensure the sealing of the weighing unit 100 and reduce the probability of its damage and thus extend its service life, and reduce the risk of the weighing unit 100 being damaged during excavation when the weighing unit 100 is damaged; Figures 8 to 13 As shown, the embodiment of the present application adds an upper cover closing body 300 on the basis of the above embodiment, specifically:

[0140] The upper cover enclosure 300 includes a top soft plate 310, a rubber sleeve 320 and a fixing frame plate 325 for fixing the rubber sleeve 320 on the floating plate 220; after the upper cover enclosure 300 is assembled, it covers the entire row of weighing units 100;

[0141] The top soft plate 310 is a metal thin plate, which is placed on the second supporting plate 150 and has a bottom area equal to the top surface area of ​​the second supporting plate 150;

[0142] The rubber sleeve 320 is an annular rubber tube, arranged longitudinally, and its length before expansion is 1 to 3 cm greater than the height of the weighing unit 100; the top edge of the rubber sleeve 320 is fixed to the edge of the top soft plate 310, and the bottom is fixed to the floating plate 220 through a fixed frame plate 325;

[0143] The fixed frame plate 325 is a slot-shaped plate body, which is fixed to the floating plate 220 by bolts and fixes the bottom edge of the rubber sleeve 320 to the floating plate 220 by extrusion;

[0144] The floating plate 220, the rubber sleeve 320 and the top soft plate 310 together form a rectangular block space;

[0145] The rubber sleeve 320 is provided with an air injection hole 321, and an air stop valve 322 is fixed on the air injection hole 321;

[0146] The rubber sleeve 320 is also provided with one or more cable holes 323 for the cable 130 to pass through, and a penetration tube 324 is fixed on the cable hole 323 to prevent air leakage in the rectangular block space; the penetration tube 324 is made of rubber, and the inner wall is closely attached to the surface of the cable 130;

[0147] After installing and arranging the upper cover enclosure 300, an air pump is used to extract the gas in the rectangular block space to prevent debris and water vapor from entering the rectangular block space; during excavation and maintenance, the upper cover enclosure 300 plays a certain protective role for the weighing unit 100 and can ensure that the weighing unit 100 remains clean after excavation to a certain extent.

[0148] Preferably, after maintenance, a new upper cover enclosure 300 is replaced for the weighing sensor.

[0149] Furthermore, the inner wall of the penetration tube 324 is larger at both ends and smaller in the middle.

[0150] Preferably, the weighing unit 100 is covered by the upper cover closure 300 before the weighing sensor leaves the factory, thereby reducing the risk of the weighing unit 100 being contaminated by water vapor, dust, etc.

[0151] Preferably, the upper cover closure 300 is in an expanded state when the weighing sensor is transported, thereby reducing the risk of transportation damage.

[0152] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A road vehicle dynamic weighing device, comprising a weighing sensor, a data acquisition device, and a weighing instrument; characterized in that: The weighing sensor is buried in the upper base layer, and the force measuring surface of the weighing sensor and the surface of the upper base layer are located in the same plane; The weighing sensor is composed of a plurality of weighing units (100) which are sequentially spliced ​​together; after the plurality of weighing units (100) are combined, they are spliced ​​together into a long rectangular strip; The weighing unit (100) is in the shape of a rectangular block as a whole, and comprises a lower bearing plate (110), a round pressure tube (120), a MEMS pressure sensor built into the round pressure tube (120), a cable (130), an upper bearing plate (140) and a second bearing plate (150); The lower bearing plates (110) are hard rectangular plates, and adjacent lower bearing plates (110) are nested together; The zigzag pressure tube (120) is a tube body bent into a zigzag shape, the tube body is filled with liquid oil, is arranged horizontally, and is fixed on the lower bearing plate (110); the cable (130) electrically connects the MEMS pressure sensor to the data acquisition device; The upper bearing plate (140) is a hard rectangular plate, fixed on the top of the round-shaped pressure tube (120) and covers the round-shaped pressure tube (120); The second bearing plate (150) is a hard plate, the bottom surface area of ​​which is the same as the top surface area of ​​the upper bearing plate (140), and covers and is fixed on the upper bearing plate (140); The weighing sensor also includes a bottom bearing unit (200); The bottom bearing unit (200) comprises a bottom box (210) and a floating plate (220); The bottom box (210) is a rectangular box body made of metal; The floating plate (220) is a rectangular hard plate body, which is placed on the bottom box (210) and can be placed in the bottom box (210); the inner bottom area of ​​the bottom box (210) is the same as the area of ​​the floating plate (220); The floating plate (220) is evenly distributed with more than 6 threaded holes (221) near the edge, and the threaded holes (221) are threaded holes for jacking bolts (224) to penetrate. The length of the jacking bolt (224) is greater than the depth of the bottom box (210), and the bottom always contacts the inner bottom of the bottom box (210). When the jacking bolt (224) rotates, it drives the floating plate (220) to move up and down; The floating plate (220) is also provided with a grouting hole (222) for grouting and an exhaust hole (223) for exhausting air and determining the completion of grouting at a position close to the edge; The grouting hole (222) and the exhaust hole (223) are both through holes, and both are equipped with plugs for plugging the holes; The lower bearing plate (110) is fixed on the upper surface of the floating plate (220); Before installation, the weighing unit (100) is pre-assembled on the floating plate (220), thereby saving installation time at the work site; The weighing sensor also includes an upper cover enclosure (300); The upper cover closing body (300) comprises a top soft plate (310), a rubber sleeve (320) and a fixing frame plate (325) for fixing the rubber sleeve (320) on the floating plate (220); After the upper cover closing body (300) is assembled, it covers the entire row of weighing units (100); The top soft plate (310) is a metal thin plate, placed on the second supporting plate (150) and having a bottom area equal to the top surface area of ​​the second supporting plate (150); The rubber sleeve (320) is an annular rubber tube, arranged longitudinally, and its length before expansion is 1 to 3 centimeters greater than the height of the weighing unit (100); The top edge of the rubber sleeve (320) is fixed on the edge of the top soft plate (310), and the bottom is fixed on the floating plate (220) through a fixed frame plate (325); The fixed frame plate (325) is a slot-shaped plate body, which is fixed to the floating plate (220) by bolts and fixes the bottom edge of the rubber sleeve (320) to the floating plate (220) by extrusion; The floating plate (220), the rubber sleeve (320) and the top soft plate (310) together form a rectangular block space; The rubber sleeve (320) is provided with an air injection hole (321), and an air stop valve (322) is fixed on the air injection hole (321); The rubber sleeve (320) is further provided with one or more cable holes (323) for the cables (130) to pass through, and a penetration tube (324) is fixed on the cable hole (323) for preventing air leakage in the rectangular block space; The penetration tube (324) is made of rubber, and its inner wall is tightly attached to the surface of the cable (130).

2. The road vehicle dynamic weighing device as claimed in claim 1, characterized in that: The material of the circular pressure tube (120) is stainless steel or titanium-aluminum alloy.

3. The road vehicle dynamic weighing device as claimed in claim 1, characterized in that: A plurality of splicing combination holes (111) and grooves for splicing are provided at the edge position in the length direction of the lower bearing plate (110); Adjacent lower bearing plates (110) can be nested together through the grooves and can be assembled and fixed together through the splicing assembly holes (111) by bolts; The length direction of the lower bearing plate (110) is perpendicular to the length direction of the entire weighing unit (100).

4. The road vehicle dynamic weighing device as claimed in claim 1, characterized in that: The second bearing plate (150) is placed on the upper bearing plate (140); the second bearing plate (150) is made of grindable material and is ground on site during installation to ensure that the surface of the weighing unit and the surface of the upper base of the asphalt concrete are on the same plane so that the tire dynamic force exerted on the weighing unit is transmitted to the return pressure pipe.

5. The road vehicle dynamic weighing device as claimed in claim 4, characterized in that: Before the weighing sensor leaves the factory, the weighing unit (100) is covered by the upper cover enclosure (300), thereby reducing the risk of the weighing unit (100) being contaminated by water vapor and dust.

6. The road vehicle dynamic weighing device as claimed in claim 5, characterized in that: When the weighing sensor is transported, the upper cover closing body (300) is in an expanded state.

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