Road surface weighing sensor device

Abstract

The utility model relates to the technical field of dynamic weighing, in particular to a road surface weighing sensor device, which comprises a base, a cover plate, two pressing strips, a capsule, a measuring end and a blocking end. A first through groove with a first step is formed in the base, a second through groove is formed in the cover plate, a second step is arranged on the outer side of the cover plate, the cover plate is placed in the first through groove, a deformable containing space for wrapping capsules is formed between the first through groove and the second through groove, and the two pressing strips are detachably installed at a groove opening of the first through groove. The cover plate is blocked through cooperation with the second step, the measuring end and the blocking end are located at the two ends of the containing space respectively, the measuring end is provided with a sensor and located outside the capsule, when the cover plate is pressed downwards, the capsule is pressed to deform, and the sensor measures the pressure increment of the capsule. When the pressure exceeds the preset value, the cover plate abuts against the first step, so that the pressure is transmitted to the base. According to the device, the requirement for capsule materials is lowered, the sealing difficulty is lowered, and long-time road sealing is not needed during maintenance and replacement.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic weighing, in particular to a road weighing sensor device. Background Art

[0002] With the development of social economy, the demand for road transportation is growing and expanding. At the same time, in order to pursue maximum benefits, the problem of vehicle overloading has become increasingly prominent in road transportation, which may cause damage to the vehicle at the very least and serious catastrophic accidents such as vehicle destruction, death, road collapse, and bridge overturning. In order to curb the stubborn problem of vehicle overloading, traffic police, transportation management, road administration and other departments (hereinafter referred to as management departments) build special weighing places on the road (or beside the road) to weigh the cargo vehicles passing through the controlled roads. Once a vehicle is overweight, it must unload the cargo before it can go on the road again.

[0003] Currently, commonly used road weighing systems are mainly divided into two categories: static (stop) weighing technology and dynamic (non-stop) weighing. Among them, dynamic weighing can achieve weighing without stopping, which is obviously more adaptable to the growing requirements of contemporary social economy and logistics and transportation. The key component of the dynamic weighing system is the dynamic weighing sensor device, and there are currently two main types of dynamic weighing sensor devices:

[0004] One type is a strip quartz load cell. Multiple quartz crystals are evenly arranged in a strip quartz load cell. These sensors are placed horizontally on the road and utilize the piezoelectric properties of the quartz crystals. When a passing wheel presses against the sensor, the measurement system converts the tire pressure applied to the sensor into a weight output, allowing the wheel's weight to be quickly determined. By arranging multiple strip quartz load cells in parallel and overlapping locations on the road, the measurement and data processing systems can quickly determine the weight of the entire vehicle. This allows the determination of overweight status of passing vehicles without stopping. However, strip quartz load cells have at least the following drawbacks:

[0005] 1) Differences in piezoelectric properties, processing dimensions, and assembly between quartz crystals will affect the output characteristics of the strip piezoelectric quartz load cell. This will result in output differences when the same weight is applied to different locations, ultimately affecting the weighing accuracy of the strip piezoelectric quartz load cell and leading to inaccurate weighing.

[0006] 2) Arranging multiple groups of quartz crystal pieces will increase the cost of the strip quartz weighing sensor, and also increase the requirements and difficulty of assembly and manufacturing, which will increase the cost of the strip quartz weighing sensor and ultimately increase the construction cost;

[0007] 3) The strip-type piezoelectric quartz weighing sensor is paved on the road surface and is repeatedly run over by trucks. Once one or several piezoelectric quartz crystals in one or several groups of the strip-type piezoelectric quartz weighing sensor are damaged, the output measurement result will be abnormal. The entire strip-type piezoelectric quartz weighing sensor can only be discarded and replaced. Replacing the strip-type piezoelectric quartz weighing sensor with degraded performance or damage requires closing the road, removing the damaged strip-type piezoelectric quartz weighing sensor, installing a new strip-type piezoelectric quartz weighing sensor, filling concrete, glue and road surface maintenance, etc., which is not only time-consuming and labor-intensive, but also seriously affects the traffic efficiency of the road.

[0008] Another type of dynamic weighing sensor uses pressurized liquid to transmit the vehicle's weight, utilizing pressure changes in a liquid capsule or tube to achieve weighing. This approach addresses or improves some of the shortcomings of strip-type quartz weighing sensors. For example, Chinese patent application publication number CN1403789A, titled "Portable Vehicle Driving Weighing Instrument"; Chinese patent application publication number CN103308129A, titled "Portable Weighing Platform and Truck Scale"; and Chinese patent application publication number CN100476375C, titled "Automobile Dynamic Weighing Sensor Device." However, existing solutions still have the following shortcomings:

[0009] 1) High cost. The capsule directly bears the pressure of the pressurized liquid and, during calibration and use, is subject to high-frequency impact (pressure) loads. Therefore, the capsule requires specialized materials or specialized manufacturing processes (e.g., embedded wire mesh), resulting in high cost. Furthermore, if the vehicle is severely overloaded (e.g., a rated load of 40 tons but the actual load exceeds 100 tons or more), the capsule may rupture, causing dynamic weighing to fail. Furthermore, replacement costs for damaged capsules increase.

[0010] 2) High sealing requirements. Since the existing capsules are generally made of materials with relatively high hardness, it is difficult for them to accurately transmit pressure. Therefore, the pressure sensor is in direct contact with the high-pressure liquid in the capsule to sense the pressure of the high-pressure liquid and its pressure changes. Such a setting will obviously put higher requirements on the installation of the sensor, that is, it is required that the pressure sensor be in contact with the high-pressure liquid and achieve high-pressure sealing. Once the seal fails, dynamic weighing will fail.

[0011] 3) Installation and calibration are difficult. Due to the existing structure, it is relatively difficult to install and fix the capsule and accurately transmit pressure changes. Therefore, calibration and installation are relatively difficult. Generally, it needs to be buried under the road surface or sealed on site with cement, glue and other materials. When recalibrating or if it is damaged and needs maintenance and replacement, the road surface needs to be destroyed, which means that the road needs to be closed for a long time for replacement, which seriously affects the traffic efficiency of the road. Utility Model Content

[0012] The purpose of the utility model is to provide a road weighing sensor device to solve at least one technical problem in the background technology.

[0013] In order to achieve the above-mentioned object, the present invention provides a road weighing sensor device, which is characterized by comprising:

[0014] The base is provided with a first through slot, the first through slot being divided into a first slot body and a second slot body from the slot opening to the slot bottom, the width of the first slot body being greater than the width of the second slot body, and a first step located in the first through slot is formed at the intersection of the first slot body and the second slot body;

[0015] The cover plate is provided with a second through-slot, and is divided into a first cover section and a second cover section on the outer side of the cover plate along a direction from the notch opening of the second through-slot to the bottom of the notch. The width of the first cover section is greater than the width of the second cover section. A second step located on the outer side of the cover plate is formed at the intersection of the first cover section and the second cover section. The cover plate is placed in the first slot body, and the second through-slot is connected to the second slot body with the notches facing each other, forming an accommodating space.

[0016] Two pressure strips are detachably arranged on both sides of the notch of the first trough body, and a portion of the pressure strips is located above the first trough body;

[0017] A capsule is placed in the accommodation space and is made of a flexible material. A liquid for transmitting pressure is provided inside the capsule. The capsule lifts the cover plate so that the second steps on both sides of the cover plate respectively abut against the two pressure strips. There is a gap between the cover plate and the first step. When the cover plate is pressurized, it moves downward or tends to move downward, causing the capsule to deform under pressure. When the deformation of the capsule exceeds a preset value, the cover plate abuts against the first step.

[0018] A measuring end, which is sealed at one end of the accommodating space and fixedly connected to the base, and the cover plate is movable relative to the measuring end. The measuring end has a sensor located outside the capsule for measuring pressure changes in the capsule; and

[0019] The blocking end is set at the other end of the accommodating space and is used to limit the capsule. The blocking end is fixedly connected to the base, and the cover plate can move relative to the blocking end. When the cover plate is pressed, the capsule is compressed and deformed. When the deformation of the capsule exceeds the preset value, the cover plate rests on the first step.

[0020] Optionally, the cover plate includes a substrate layer and a thickness adjustment layer, the second through groove is opened on the first side surface of the substrate layer, and the thickness adjustment layer is arranged on the second side surface of the substrate layer, and the second side surface is opposite to the first side surface.

[0021] Optionally, a dovetail groove is provided on the second side surface of the substrate layer, an embedded block matching the dovetail groove is provided on the thickness adjustment layer, and the thickness adjustment layer is connected to the substrate layer by embedding the embedded block into the dovetail groove.

[0022] Optionally, the thickness adjustment layer is formed by casting a mixture of epoxy resin glue containing a curing agent and quartz sand.

[0023] Optionally, the measuring end includes a sensor, a first connecting block and a pressure cap, the first connecting block is mounted on the end face of the base by screws, the first connecting block is provided with a first mounting hole that passes through the first connecting block and is connected to the accommodating space, the end of the first connecting block facing away from the base is provided with an annular column coaxial with the first mounting hole, the outer side of the annular column is provided with an external thread, the pressure cap is threadedly connected to the annular column, the sensor is installed in the first mounting hole, and the measuring end face of the sensor is flush with the end face of the first connecting block facing the base.

[0024] Optionally, the measuring end further comprises a first protective sleeve, one end of the first protective sleeve is an open end, the other end is provided with a wire hole for the cable to pass through, and the open end is provided with an internal thread;

[0025] The outer side of the pressure cap is provided with an external thread and the end of the pressure cap is provided with a through hole for the sensor to pass through. The first protective cover is on the outer side of the pressure cap and is threadedly connected to the pressure cap. The open end rests on the first connecting block, and the sensor cable passes through the through hole.

[0026] Optionally, the measuring end further includes a pressure-equalizing diaphragm, which is arranged on a side of the first connecting block facing the capsule and covers the measuring end surface of the sensor.

[0027] Optionally, the sensor is a piezoelectric pressure sensor, a piezoelectric force sensor, a strain gauge pressure sensor or a strain gauge force sensor.

[0028] Optionally, the blocking end includes a second connecting block and a push rod, the second connecting block is mounted on the end surface of the base by screws, the push rod is mounted on the second connecting block and one end is against the capsule, and the initial pressure of the capsule can be adjusted by adjusting the length of the push rod extending into the accommodating space.

[0029] Optionally, the second connecting block is provided with a second mounting hole that passes through the second connecting block and is connected to the accommodating space. The second mounting hole is a threaded hole, and the outside of the push rod is provided with an external thread. The push rod is threadedly engaged with the second mounting hole and one end is against the capsule. The length of the push rod extending into the accommodating space is adjusted by rotating the push rod.

[0030] Optionally, the push rod is an electric telescopic rod;

[0031] The second connecting block is provided with a second mounting hole which passes through the second connecting block and is connected with the accommodating space. The telescopic end of the electric telescopic rod passes through the second mounting hole, extends into the accommodating space and abuts against the capsule.

[0032] Optionally, a push block is further provided at the front end of the push rod. The size of the push block is larger than the size of the cross section of the push rod, and the push rod is pressed against the capsule through the push block.

[0033] Optionally, a pressure sensor is provided at the front end of the push block for directly detecting the pressure of the push block.

[0034] Optionally, the blocking end further includes a second protective sleeve, and the second protective sleeve is provided with an internal thread;

[0035] One end of the push rod outside the accommodating space is provided with an external thread, the second protective sleeve is covered on the outside of the push rod and is threadedly connected to the push rod, and the second protective sleeve is against the second connecting block.

[0036] Optionally, the length of the cover plate is greater than that of the base, and is used to shield the blocking end and the measuring end.

[0037] Optionally, a vibration isolation plate is provided on the outer side of the base.

[0038] Optionally, the flexible material is polyvinyl chloride, polyethylene, polypropylene, polystyrene, latex or nitrile rubber.

[0039] The above technical solution of the utility model has the following advantages:

[0040] The road weighing sensor device provided by the utility model includes a base, a cover plate, two pressure strips, a capsule, a measuring end and a blocking end. A first through groove is provided on the base, which is divided into a first groove body and a second groove body from the groove opening to the groove bottom. The width of the first groove body is greater than the width of the second groove. A second through groove is provided on the cover plate, and a second step is provided on the outer side. The cover plate is placed in the first through groove. The second through groove is connected to the second groove body and the groove openings are opposite to each other, forming a storage space. A measuring end and a blocking end are respectively provided at both ends of the storage space. The measuring end has a sensor and is located outside the capsule. The two pressure strips are detachably mounted on both sides of the groove opening of the first groove body. The capsule is placed in the storage space. The capsule lifts the cover plate so that the second steps on both sides of the cover plate are respectively against the two pressure strips. There is a gap between the cover plate and the first step. When the cover plate is pressurized, it moves downward or has a tendency to move downward, causing the capsule to be compressed and deformed. The sensor measures the pressure change of the capsule. The measuring sensor and the capsule are set separately to reduce the difficulty of installing and sealing the measuring sensor. When the capsule deforms beyond a preset value, the cover plate abuts against the first step, transferring the pressure to the base. This prevents damage to the capsule caused by excessive loads, reduces the requirements for capsule material strength, and thus reduces costs. To replace the capsule or perform maintenance, simply remove the pressure strip to remove the cover plate and capsule, without damaging the road surface or closing the road for an extended period. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual product.

[0042] Figure 1 This is a schematic top view of a road weighing sensor device according to an embodiment of the present invention;

[0043] Figure 2 yes Figure 1 AA cross-sectional diagram in;

[0044] Figure 3 yes Figure 1 BB cross-section diagram in;

[0045] Figure 4 This is a schematic structural diagram of a measuring end (half cut off) in an embodiment of the present invention;

[0046] Figure 5 yes Figure 4 Schematic diagram of the structure of the first connecting block (cut off in half);

[0047] Figure 6 yes Figure 4 Schematic diagram of the structure of the pressure cap (cut off half);

[0048] Figure 7 This is a schematic structural diagram of a blocking end (half cut off) in an embodiment of the present invention;

[0049] Figure 8 This is a structural diagram of a second connecting block in an embodiment of the present utility model;

[0050] Figure 9 This is a schematic structural diagram of a push rod in an embodiment of the present utility model;

[0051] Figure 10 This is a structural diagram of a push block in an embodiment of the utility model;

[0052] Figure 11 This is a structural diagram of a base in an embodiment of the present utility model;

[0053] Figure 12 yes Figure 11 A magnified schematic diagram of part C in FIG;

[0054] Figure 13 This is a structural diagram of a cover body in an embodiment of the present utility model;

[0055] Figure 14 This is a structural diagram of a layering strip in an embodiment of the present utility model;

[0056] Figure 15 The figure is a cross-sectional schematic diagram of a road surface weighing sensor device installed on a road surface in an embodiment of the present utility model.

[0057] In the picture:

[0058] 1: base;

[0059] 11: first through groove;

[0060] 111: first tank;

[0061] 112: second tank;

[0062] 113: First step;

[0063] 2: Cover plate;

[0064] 21: second through slot;

[0065] 22: first cover body section;

[0066] 23: second cover section;

[0067] 24: Second step;

[0068] 25: substrate layer;

[0069] 26: thickness adjustment layer;

[0070] 3: Layering;

[0071] 31: dustproof sealing cover;

[0072] 4: Capsule;

[0073] 5: Measuring end;

[0074] 51: sensor;

[0075] 52: first connection block;

[0076] 521: first mounting hole;

[0077] 522: annular column;

[0078] 53: pressure cap;

[0079] 54: first protective cover;

[0080] 541: cable hole;

[0081] 55: pressure equalizing diaphragm;

[0082] 6: blocking end;

[0083] 61: second connection block;

[0084] 611: second mounting hole;

[0085] 62: Putt;

[0086] 621: Hexagon socket countersunk hole;

[0087] 63: Push block;

[0088] 64: second protective cover;

[0089] 7: Vibration isolation plate;

[0090] 8: Road surface. DETAILED DESCRIPTION

[0091] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0092] like Figures 1 to 3 As shown, the road weighing sensor device provided by the embodiment of the utility model includes a base 1, a cover plate 2, two pressure strips 3, a capsule 4, a measuring end 5 and a blocking end 6.

[0093] See also Figure 1 、 Figure 11 and Figure 12 As shown, the base 1 is provided with a first through groove 11, which is divided into a first groove body 111 and a second groove body 112 from the groove mouth to the groove bottom. The width of the first groove body 111 is greater than the width of the second groove body 112, and a first step 113 is formed in the first through groove 11 at the intersection of the first groove body 111 and the second groove body 112.

[0094] See also Figure 2 、 Figure 3 and Figure 13 As shown, the cover plate 2 is provided with a second through slot 21, and is divided into a first cover body section 22 and a second cover body section 23 on the outer side of the cover plate 2 along the direction from the slot opening of the second through slot 21 to the slot bottom. The width of the first cover body section 22 is greater than the width of the second cover body section 23, and a second step 24 located on the outer side of the cover plate 2 is formed at the intersection of the first cover body section 22 and the second cover body section 23. The cover plate 2 is placed in the first slot body 111, and the second through slot 21 is connected to the second slot body 112 with the slot openings facing each other, forming an accommodating space.

[0095] See also Figure 1 、 Figure 3 and Figure 14 As shown, two bead strips 3 are detachably mounted on both sides of the notch of the first slot 111 by screws, and a portion of them is located above the first slot 111. In order to improve the sealing effect, preferably, a dustproof sealing cover 31 is provided at the fixing screws of the bead strip 3.

[0096] See also Figure 2 and Figure 3As shown, capsule 4 is placed in the accommodation space. A pressure-transmitting liquid is contained within capsule 4. This pressure lifts cover plate 2, causing the second steps 24 on either side of cover plate 2 to contact the two pressure strips 3. A gap exists between cover plate 2 and first step 113. When pressure is applied, cover plate 2 moves downward or tends to move downward, causing capsule 4 to deform under pressure. When the deformation of capsule 4 exceeds a predetermined value, cover plate 2 abuts against first step 113, transmitting the pressure to base 1. This prevents damage to capsule 4 due to excessive load, thereby ensuring the safety and continued usability of the road weighing sensor device. In one example, a rated load of 40 tons is set. Correspondingly, at this time, deformation of capsule 4 is safe, and cover plate 2 does not contact first step 113. When the vehicle is severely overloaded, for example, with an actual load exceeding 100 tons or more, cover plate 2 abuts against first step 113, preventing capsule 4 from being crushed.

[0097] Due to the structure of the present invention, the material requirements for the capsule are greatly reduced. Flexible film materials commonly used in the prior art can generally meet these requirements. In this embodiment, the capsule 4 is made of a commonly used flexible material in the prior art, such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, latex, or nitrile rubber, and is filled with a liquid for pressure transmission. The above is merely an example and does not constitute a specific limitation on the material of the capsule 4.

[0098] In this embodiment, the cross-sectional shape of the capsule 4 is not limited, for example, it can be circular, elliptical, rectangular, hexagonal, etc. Preferably, the cross-sectional shape of the capsule 4 is circular, and correspondingly preferably, the cross-sectional shapes of the second trough body 112 and the second through groove 21 are matching semicircular or approximately semicircular arcs to achieve a more fitting package.

[0099] In this embodiment, the liquid used for pressure transmission is a liquid with stable performance over temperature, low volatility, small pressure change or regular pressure change, such as hydraulic oil.

[0100] See also Figure 1 and Figure 2 As shown, a measuring end 5 and a blocking end 6 are located at either end of the accommodation space. Measuring end 5 includes a sensor 51, located outside capsule 4. The sensor 51's measuring end faces abut against the end of capsule 4 to measure pressure changes in capsule 4. Blocking end 6 blocks the accommodation space at that end, confining capsule 4.

[0101] See also Figure 15As shown, during use, the elongated road weighing sensor device is positioned perpendicular to the vehicle's travel direction. Specifically, the road weighing sensor device is embedded within the road surface 8, with the upper surface of the cover plate 2 flush with the road surface 8 to avoid causing vehicle vibration. A capsule 4, holding a certain pressure, is confined within the containment space. When a vehicle passes over the road weighing sensor device, the cover plate 2 moves downward, reducing the volume of the containment space. This volume change exhibits a definite (linear) relationship with the weight of the vehicle tires. The reduction in the volume of the containment space causes the capsule 4 to deform within the confined space, generating a pressure increase. This pressure increase exhibits another definite (linear) relationship with the compression deformation of the containment space. The measuring end face of sensor 51 senses this pressure increase, and a data processing system detects and processes the output signal of sensor 51. The output signal of sensor 51 exhibits a unique (linear) relationship with the vehicle tire load. After preliminary calibration, calibration data is obtained, and the data processing system is used to obtain the vehicle tire weight, and thus the vehicle axle weight and the total vehicle weight.

[0102] When the vehicle is seriously overloaded, the cover plate 2 will rest against the first step 113, transferring the pressure to the base 1 to prevent the capsule 4 from being damaged due to exceeding the bearing limit. The road weighing sensor device wraps the capsule 4 with a deformable accommodating space, and can transfer the force to the capsule 4 when the cover plate 2 is under pressure. Overload protection is achieved through the cooperation of the first step 113 and the cover plate 2, which reduces the probability of damage to the road weighing sensor device, improves safety, reduces the requirements for the material strength of the capsule 4, and thus reduces costs. The sensor 51 is set on the outside of the capsule 4, and the boost data is obtained when the capsule 4 is deformed. The vehicle weight can be obtained using the boost data, which reduces the sealing difficulty of the capsule 4 and does not affect the measurement accuracy. When the capsule needs to be replaced or needs to be adjusted and maintained, it is only necessary to remove the pressure strip 3 to take out the cover plate 2 and the capsule 4 without damaging the road surface or closing the road for a long time.

[0103] It should be noted that how to use the boost data to obtain the weight is a prior art and is not the inventive point of the present utility model and is not required here.

[0104] In order to facilitate the adjustment of the positional relationship between the cover plate 2 and the road surface during installation and calibration (for example, the cover plate is flush with the road surface), in one example, see Figure 3 and Figure 13 As shown, the cover plate 2 includes a substrate layer 25 and a thickness adjustment layer 26. The second through-slot 21 is defined on a first side surface of the substrate layer 25, and the thickness adjustment layer 26 is disposed on a second side surface of the substrate layer 25, the second side surface being opposite to the first side surface. The thickness adjustment layer 26 is detachably connected to the substrate layer 25. In this example, the thickness of the cover plate 2 can be adjusted by replacing the thickness adjustment layer 26 with different thicknesses.

[0105] In another example, the cover plate 2 includes a substrate layer 25 and a thickness adjustment layer 26. The thickness adjustment layer 26 is fixedly connected to the substrate layer 25, but the thickness adjustment layer 26 is made of a grindable material. After installation, the thickness of the cover plate 2 can be adjusted by grinding the thickness adjustment layer 26. Preferably, the grinding material is a material with a hardness close to that of the road surface. In one specific embodiment, the thickness adjustment layer 26 is formed by casting a mixture of epoxy resin glue containing a curing agent and quartz sand. It should be noted that the above materials are prior art, and their proportions and preparation processes are all prior art.

[0106] In a preferred embodiment, a dovetail groove is provided on the second side surface of the substrate layer 25, and an insert block is provided on the thickness adjustment layer 26 to match the dovetail groove. The thickness adjustment layer 26 is connected to the substrate layer 25 by inserting the insert block into the dovetail groove. In embodiments where the substrate layer 25 and the thickness adjustment layer 26 are detachably connected, the dovetail groove and the insert block cooperate to facilitate replacement and assembly, enhancing the tightness and reliability of the connection. In embodiments where the thickness adjustment layer 26 is cast on the substrate layer 25, the dovetail groove and the insert block cooperate to provide a more secure connection between the two.

[0107] In this embodiment, the measuring end 5 can achieve its function as long as it has a sensor 51 that can obtain the pressure increase of the capsule 4. There are many ways to implement it. For example, a stopper is installed at the end of the base 1, and a mounting hole is opened on the stopper for mounting the sensor 51, so that the sensor 51 can contact the capsule 4 and obtain its pressure change. The stopper and the base can be welded or detachably fixed. For another example, see Figure 2 and Figures 4 to 6 As shown, the measuring end 5 includes a sensor 51, a first connecting block 52 and a pressure cap 53. The first connecting block 52 is mounted on the end face of the base 1 by screws. The first connecting block 52 is provided with a first mounting hole 521 that passes through the first connecting block 52 and is connected to the accommodating space. The end of the first connecting block 52 facing away from the base 1 is provided with an annular column 522 that is coaxial with the first mounting hole 521. The outer side of the annular column 522 is provided with an external thread. The pressure cap 53 is threadedly connected to the annular column 522, and the sensor 51 is installed in the first mounting hole 521. The measuring end face of the sensor 51 is flush with the end face of the first connecting block 52 facing the base 1. If it is desired to further improve the sealing performance, sealing rings and / or sealants can be provided at the joints of each part to ensure that the road weighing sensor device is protected and protected from moisture during storage, transportation, installation, etc. For example, a sealing ring can be provided between the first connecting block 52 and the base 1 and the cover plate 2, or a sealant can be filled between the first connecting block 52 and the base 1 and the cover plate 2.

[0108] In a preferred embodiment, see Figure 2 and Figure 4As shown, the measuring end 5 also includes a first protective cover 54, one end of the first protective cover 54 is open, and the other end is provided with a wire hole 541 for the cable to pass through, and the open end is provided with an internal thread. The outer side of the pressure cap 53 is provided with an external thread and a through hole for the sensor 51 to pass through is provided at the end of the pressure cap 53 (see Figure 4 and Figure 6 As shown, the first protective cover 54 covers the outside of the pressure cap 53 and is threadedly connected to the pressure cap 53. The open end abuts against the first connecting block 52. The cable of the sensor 51 passes through the wire hole 541 to further improve the protection of the sensor. At the same time, it is convenient to further seal it on this basis when necessary. For example, a sealing ring is provided between the first protective cover 54 and the first connecting block 52, and a sealing treatment is performed between the cable of the sensor 51 and the wire hole 541. Preferably, the signal cable of the sensor 51 is provided with a plug connector to facilitate the removal and installation of the signal cable, avoiding the inconvenience caused by the long signal cable of the strip-type quartz weighing sensor during calibration, storage, transportation, installation, etc.

[0109] Of course, in some examples, wireless signal transmission can also be used. In this case, there is no need to set up wire holes for cables to pass through.

[0110] Since the capsule 4 may form some small wrinkles when deforming, if the wrinkles are different each time it deforms, the measurement results may be slightly different. In order to further improve the measurement accuracy of the sensor 51, in one example, see Figure 4 As shown, the measuring end 5 also includes a pressure-equalizing diaphragm 55. The hardness of the pressure-equalizing diaphragm 55 is greater than the hardness of the material of the capsule 4. The pressure-equalizing diaphragm 55 is arranged on the side of the first connecting block 52 facing the capsule 4. The size is larger than and covers the measuring end face of the sensor 51. That is, the pressure-equalizing diaphragm 55 covers the measuring end face of the sensor 51 and part of the first connecting block 52 at the same time, offsetting the effect of possible wrinkles on the capsule 4 on the measurement accuracy. In addition, if there are certain requirements for the frequency response of the sensor, the effect of the selected pressure-equalizing diaphragm 55 on the frequency response of the sensor 51 should be within the allowable range to avoid failing to meet the designed measurement requirements. Preferably, the frequency response of the sensor 51 is reduced by no more than 5%. In a specific example, the pressure-equalizing diaphragm 55 is a 0.2mm polyurethane sheet or a 0.1mm aluminum sheet.

[0111] It is worth noting that the above-mentioned pressure-equalizing diaphragms are only examples and are not limitations of the present invention. People skilled in the art can select different materials and thicknesses according to design requirements.

[0112] In this embodiment, the sensor 51 is a piezoelectric pressure sensor, a piezoelectric force sensor, a strain gauge pressure sensor, or a strain gauge pressure sensor.

[0113] In this embodiment, the blocking end 6 may only have a blocking function, for example, the blocking end 6 is a stopper mounted on the end surface of the base 1 by welding or screws. Preferably, the blocking end 6 also has a pressure regulating function to facilitate the adjustment of the initial pressure of the capsule 4, see Figure 2 、 Figures 7 to 10 As shown, the blocking end 6 includes a second connecting block 61 and a push rod 62. The second connecting block 61 is mounted on the end surface of the base 1 by screws. The push rod 62 is mounted on the second connecting block 61 and one end is against the capsule 4. By adjusting the length of the push rod 62 extending into the accommodating space, different pressures can be provided to the capsule 4.

[0114] In one example, see Figure 7 and Figure 8 As shown, the second connecting block 61 is provided with a second mounting hole 611 that passes through the second connecting block 61 and is connected to the accommodating space. The second mounting hole 611 is a threaded hole. The outer surface of the push rod 62 is provided with an external thread. The push rod 62 is threadedly matched with the second mounting hole 611 and one end is against the capsule 4. By rotating the push rod 62, the length of the push rod 62 extending into the accommodating space is adjusted, thereby achieving the adjustment of the static (initial) pressure of the capsule 4. In order to facilitate the adjustment of the push rod 62, in one example, see Figure 9 As shown, an inner hexagonal countersunk hole 621 is provided at one end of the push rod 62 away from the accommodating space, so as to facilitate adjustment using a hexagonal wrench.

[0115] In another example, the push rod 62 is an electrically operated telescopic rod. The second connecting block 61 is provided with a second mounting hole 611 that passes through the second connecting block 61 and communicates with the accommodating space. The telescopic end of the electrically operated telescopic rod extends through the second mounting hole 611 into the accommodating space and abuts against the capsule 4. The length of the push rod 62 extending into the accommodating space is adjusted by telescoping the push rod 62, thereby adjusting the static (initial) pressure of the capsule 4. Of course, in another example, a structure such as a ball screw can also be used to adjust the static (initial) pressure of the capsule 4.

[0116] For some examples, see Figure 7 As shown, a push block 63 is provided at the front end of the push rod 62. The push block 63 is larger than the cross-sectional size of the push rod 62. The push rod 62 abuts against the capsule 4 via the push block 63, thereby increasing the contact area with the capsule 4. Preferably, the push block 63 is detachably connected to the push rod 62, for example, by screw connection, clamping connection, threaded connection, etc.

[0117] In order to facilitate the determination of the pressure between the push block 63 and the capsule 4 and thus achieve better adjustment, in one example, a pressure sensor is provided at the front end of the push block 63 for directly detecting the pressure of the push block 63, and the measuring end face of the pressure sensor is flush with the end face of the push block 63 facing the capsule 4.

[0118] To better protect the plugging end, see Figure 7 As shown, in one example, the blocking end 6 further includes a second protective sleeve 64 having an internal thread. The end of the push rod 62 located outside the accommodation space has an external thread. The second protective sleeve 64 covers the outside of the push rod 62 and is threadedly connected to the push rod 62. The second protective sleeve 64 abuts against the second connecting block 61. To improve the sealing effect, in one example, a sealing structure such as a sealing gasket or sealant can be provided between the second protective sleeve 64 and the second connecting block 61.

[0119] Of course, in some embodiments, pressure regulation can also be achieved by increasing or decreasing the thickness or number of pads in the accommodation space where the blocking end 6 is located.

[0120] In any of the above embodiments in which the blocking end 6 is detachably fixedly connected, the capsule can be replaced simply by removing the blocking end 6, which is faster and more convenient.

[0121] In order to minimize the coverage of the road surface weighing sensor device and facilitate operation of the measuring end 5 and the blocking end 6, in some examples, a separate shell can be used to be flush with the cover plate 2 and cover the blocking end 6 and the measuring end 5 to achieve shielding of the blocking end 6 and the measuring end 5.

[0122] In order to isolate the influence of road vibration on the output of road load cell device and reduce the interference of road vibration on measurement, in one example, see Figure 3 and Figure 15 As shown, a vibration isolation plate 7 is provided on the outside of the base 1. Theoretically, any existing structure with both shock absorption and vibration isolation functions can achieve a certain degree of effectiveness. In one embodiment, the vibration isolation plate 7 is made of a flexible material, such as a durable, sun-resistant and rain-resistant foam material. The specific material is not limited here. Preferably, the vibration isolation plate 7 is flush with the road surface 8 in height, i.e., its height is equal to the sum of the heights of the base 1 and the pressure strip 3, so as not to cause vibration in the vehicle.

[0123] Any details not described in the present invention are common knowledge or prior art in the art.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0125] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features thereof may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A road weighing sensor device, characterized in that: include: The base is provided with a first through slot, wherein the first through slot is divided into a first slot body and a second slot body from the slot opening to the slot bottom, the width of the first slot body is greater than the width of the second slot body, and a first step is formed in the first through slot at the intersection of the first slot body and the second slot body; The cover plate is provided with a second through-slot, and is divided into a first cover section and a second cover section on the outer side of the cover plate along a direction from the notch opening to the bottom of the second through-slot, wherein the width of the first cover section is greater than the width of the second cover section, and a second step is formed on the outer side of the cover plate at the intersection of the first cover section and the second cover section. The cover plate is placed in the first slot body, and the second through-slot is connected to the second slot body with the notches facing each other, forming an accommodating space; Two pressure strips are detachably arranged on both sides of the notch of the first trough body, and a portion of the pressure strips is located above the first trough body; A capsule is placed in the accommodation space and is made of a flexible material. A liquid for transmitting pressure is provided inside the capsule. The capsule lifts the cover plate so that the second steps on both sides of the cover plate respectively abut against the two pressure strips. A gap is formed between the cover plate and the first steps. a measuring end, which is sealed at one end of the accommodating space and fixedly connected to the base, wherein the cover plate is movable relative to the measuring end, and the measuring end has a sensor and is located outside the capsule for measuring pressure changes in the capsule; as well as A blocking end is provided at the other end of the accommodating space for limiting the capsule. The blocking end is fixedly connected to the base. The cover plate can move relative to the blocking end. When the cover plate is compressed, the capsule is compressed and deformed. When the deformation of the capsule exceeds a preset value, the cover plate abuts against the first step.

2. The road weighing sensor device according to claim 1, characterized in that: The cover plate includes a substrate layer and a thickness adjustment layer. The second through groove is opened on the first side surface of the substrate layer. The thickness adjustment layer is arranged on the second side surface of the substrate layer. The second side surface is opposite to the first side surface.

3. The road weighing sensor device according to claim 2, characterized in that: A dovetail groove is provided on the second side surface of the substrate layer, an embedding block matching the dovetail groove is provided on the thickness adjustment layer, and the thickness adjustment layer is connected to the substrate layer by embedding the embedding block into the dovetail groove.

4. The road surface weighing sensor device according to claim 2 or 3, characterized in that: The thickness adjustment layer is formed by mixing and pouring epoxy resin glue containing a curing agent and quartz sand.

5. The road weighing sensor device according to claim 1, characterized in that: The measuring end includes a sensor, a first connecting block, a pressure cap and a first protective sleeve, the first connecting block is mounted on the end surface of the base by screws, the first connecting block is provided with a first mounting hole that passes through the first connecting block and is connected to the accommodating space, an annular column is provided on the end of the first connecting block away from the base and is coaxial with the first mounting hole, the outer side of the annular column is provided with an external thread, the pressure cap is threadedly connected to the annular column, the sensor is mounted in the first mounting hole, and the measuring end surface of the sensor is flush with the end surface of the first connecting block facing the base; One end of the first protective sleeve is an open end, and the other end is provided with a wire hole for the cable to pass through, and the open end is provided with an internal thread; The outer side of the pressure cap is provided with an external thread and the end of the pressure cap is provided with a through hole for the sensor to pass through. The first protective cover is on the outer side of the pressure cap and is threadedly connected to the pressure cap. The open end rests on the first connecting block, and the cable of the sensor passes through the through hole.

6. The road surface weighing sensor device according to claim 5, characterized in that: The measuring end further includes a pressure-equalizing diaphragm, which is arranged on a side of the first connecting block facing the capsule, is larger than and covers the measuring end face of the sensor, and has a hardness greater than the material hardness of the capsule.

7. The road surface weighing sensor device according to claim 1, characterized in that: The sensor is a piezoelectric pressure sensor, a piezoelectric force sensor, a strain gauge pressure sensor or a strain gauge force sensor; and / or A vibration isolation plate is provided on the outer side of the base.

8. The road surface weighing sensor device according to claim 1, characterized in that: The blocking end includes a second connecting block, a push rod and a second protective sleeve, wherein the second connecting block is mounted on the end surface of the base by screws, and the push rod is mounted on the second connecting block. A push block is further provided at the front end of the push rod, and the size of the push block is larger than the size of the cross section of the push rod. The push rod is pressed against the capsule through the push block, and the initial pressure of the capsule can be adjusted by adjusting the length of the push rod extending into the accommodating space. The second protective sleeve is provided with an internal thread, and the end of the push rod located outside the accommodating space is provided with an external thread. The second protective sleeve covers the outside of the push rod and is threadedly connected to the push rod. The second protective sleeve rests on the second connecting block.

9. The road surface weighing sensor device according to claim 8, characterized in that: The second connecting block is provided with a second mounting hole which passes through the second connecting block and is in communication with the accommodating space. The second mounting hole is a threaded hole. The outer surface of the push rod is provided with an external thread. The push rod is threadedly engaged with the second mounting hole and one end of the push rod is against the capsule. The length of the push rod extending into the accommodating space is adjusted by rotating the push rod; or The push rod is an electric telescopic rod. The second connecting block is provided with a second mounting hole that passes through the second connecting block and is connected to the accommodating space. The telescopic end of the electric telescopic rod passes through the second mounting hole, extends into the accommodating space and rests on the capsule.

10. The road surface weighing sensor device according to claim 1, characterized in that: The flexible material is polyvinyl chloride, polyethylene, polypropylene, polystyrene, latex or nitrile rubber.

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