A road weighing sensor device

Abstract

The present invention relates to the field of dynamic weighing technology, and in particular to a road weighing sensor device, including a base, a cover plate, two pressure strips, a capsule, a measuring end and a blocking end. The base is provided with a first through slot with a first step, the cover plate is provided with a second through slot, and a second step is provided on the outer side. The cover plate is placed in the first through slot, and a deformable accommodation space for wrapping the capsule is formed between the first through slot and the second through slot. The two pressure strips are detachably installed in the notch of the first through slot, and the cover plate is blocked by cooperating with the second step. The measuring end and the blocking end are respectively located at the two ends of the accommodation space. The measuring end has a sensor and is located outside the capsule. When the cover plate is pressed downward, the capsule is compressed and deformed, 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 to transfer the pressure to the base. The device reduces the requirements for the capsule material and the difficulty of sealing, and there is no need to close the road for a long time during maintenance and replacement.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic weighing, and 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 least and serious catastrophic accidents such as vehicle destruction, death, road collapse, and serious damage to bridge overturning. In order to curb the stubborn problem of vehicle overloading, the 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 on the controlled roads. Once a vehicle is overweight, it must unload the cargo before it can get back on the road.

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

[0004] One is a strip-type quartz weighing sensor (see Figure 1 and Figure 2 ), in the strip quartz weighing sensor, multiple groups of quartz crystal sheets are evenly arranged. During use, the strip quartz weighing sensor is arranged horizontally on the road, and the piezoelectric characteristics of the quartz crystal are used to work. When the passing wheel presses the strip quartz weighing sensor, the measurement system converts the tire pressure of the strip quartz weighing sensor into weight output, that is, the weight of the wheel can be quickly obtained. Multiple strip quartz weighing sensors are arranged in parallel and overlapped on the road surface, and the weight of the entire vehicle can be quickly obtained through the measurement system and data processing system. Therefore, the passing vehicle can be judged whether the vehicle is overweight without stopping. There are at least the following deficiencies for the strip quartz weighing sensor:

[0005] 1) The differences in piezoelectric properties, processing dimensions, and assembly between quartz crystal sheets will affect the output characteristics of the strip piezoelectric quartz weighing sensor, which will lead to output differences of the strip piezoelectric quartz weighing sensor under the same weight load at different positions, which will eventually affect the weighing accuracy of the strip piezoelectric quartz weighing sensor and lead to inaccurate weighing;

[0006] 2) Arranging multiple groups of quartz crystal sheets will increase the cost of strip quartz weighing sensors, and also increase the requirements and difficulty of assembly and production, which will increase the cost of strip quartz weighing sensors and ultimately increase construction costs;

[0007] 3) Strip piezoelectric quartz weighing sensors are paved on the road surface and are repeatedly rolled over by trucks. Once one or several piezoelectric quartz crystals in one or several groups of the strip piezoelectric quartz weighing sensors are damaged, the output measurement results will be abnormal, and the entire strip piezoelectric quartz weighing sensor can only be discarded and replaced. Replacing the strip piezoelectric quartz weighing sensor with degraded performance or damage requires closing the road, removing the damaged strip piezoelectric quartz weighing sensor, installing a new strip piezoelectric quartz weighing sensor, filling concrete, glue and road pavement 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 device is a sensor that uses pressurized liquid to transfer the weight of the car, and uses the pressure change of the liquid capsule or tube to achieve weighing, which solves or improves some of the defects of the strip quartz weighing sensor to a certain extent. For example, the Chinese patent application with publication number CN1403789A and titled "Portable Car Driving Weighing Instrument"; the Chinese patent application with publication number CN103308129A and titled "Portable Weighing Platform and Car Scale"; the Chinese patent application with publication number CN100476375C and titled "Car Dynamic Weighing Sensor Device", etc. However, the existing solutions still have the following shortcomings:

[0009] 1) The cost of use is high. The capsule needs to directly bear the pressure of the pressurized liquid. During calibration and use, it also needs to bear high-frequency additional impact (pressure) loads. Therefore, the capsule requires special materials or special processes (for example, embedded metal wire mesh, etc.), which leads to high capsule costs. In addition, if the car is seriously overloaded (such as a rated load of 40 tons, but the actual load exceeds 100 tons or more), this will cause the capsule to rupture, dynamic weighing will fail, and the cost of use will increase due to replacement after damage.

[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 forward higher requirements for 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 difficult. Generally, it needs to be buried under the road surface or cast and sealed with cement, glue and other materials on site. When recalibrating or when damage occurs and maintenance and replacement are required, the road surface needs to be destroyed, that is, the road needs to be closed for a long time for replacement, which seriously affects the traffic efficiency of the road. Summary of the invention

[0012] The object of the present invention 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 object, the present invention provides a road weighing sensor device, characterized in that it includes:

[0014] The base is provided with a first through groove, the first through groove 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 body, and a first step located in the first through groove is formed at the intersection of the first groove body and the second groove body;

[0015] The cover plate is provided with a second through groove, and is divided into a first cover body section and a second cover body section along the direction from the groove opening to the groove bottom of the second through groove on the outer side of the cover plate, the width of the first cover body section is greater than the width of the second cover body section, and a second step located on the outer side of the cover plate is formed at the intersection of the first cover body section and the second cover body section, the cover plate is placed in the first groove body, the second through groove is connected with the second groove body, and the groove openings are opposite to each other, so as to form an accommodation space;

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

[0017] The capsule is placed in the accommodating 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 are respectively against the two pressure strips. There is a gap between the cover plate and the first step. When the cover plate is pressed, it moves downward or has a tendency to move downward, so that the capsule is compressed and deformed. When the deformation of the capsule exceeds a preset value, the cover plate is against the first step.

[0018] A measuring end, which is sealed at one end of the accommodating space and fixedly connected to the base, wherein the cover plate can move relative to the measuring end, and the measuring end has a sensor, which is located outside the capsule and is used to measure the pressure change of 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 compressed, 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 a first side surface of the substrate layer, the thickness adjustment layer is arranged on a 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 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.

[0022] Optionally, the thickness adjustment layer is formed by mixing and casting 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 installed on the end face of the base by screws, the first connecting block is provided with a first mounting hole that penetrates the first connecting block and is connected to the accommodating space, the end of the first connecting block 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 is against the first connecting block, and the cable of the sensor passes through the through hole.

[0026] Optionally, the measuring end further comprises 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. The outside of the push rod is provided with an external thread. The push rod is threadedly matched 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 penetrates 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 to directly detect 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 covers the outside of the push rod and is threadedly connected with the push rod, and the second protective sleeve abuts against the second connecting block.

[0036] Optionally, the length of the cover plate is greater than the length 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 present invention has the following advantages:

[0040] The road weighing sensor device provided by the present invention 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 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. 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 slot body and the slot openings are opposite to each other, forming a receiving space. A measuring end and a blocking end are respectively provided at both ends of the receiving space. The measuring end has a sensor and is located outside the capsule. The two pressure strips are detachably installed on both sides of the slot opening of the first slot body. The capsule is placed in the receiving 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 compressed, it moves downward or has a tendency to move downward, so that the capsule is compressed and deformed. The sensor measures the pressure change of the capsule. The measuring sensor and the capsule are separately provided to reduce the difficulty of installing and sealing the measuring sensor. When the capsule is deformed beyond the preset value, the cover plate abuts against the first step, transferring the pressure to the base, thus avoiding damage to the capsule due to excessive load, reducing the requirements for the strength of the capsule material, and thus reducing costs. When the capsule needs to be replaced or adjusted for maintenance, the cover plate and capsule can be taken out by simply removing the pressure strip, without damaging the road surface or closing the road for a long time. 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 products.

[0042] Figure 1 It is a structural schematic diagram of a strip-type quartz weighing sensor in the background technology;

[0043] Figure 2 It is a schematic diagram of the internal structure of a strip-type quartz weighing sensor in the background technology;

[0044] Figure 3 is a schematic diagram of a top view of a road weighing sensor device according to an embodiment of the present invention;

[0045] Figure 4 yes Figure 3 AA section diagram in;

[0046] Figure 5 yes Figure 3 BB cross-section diagram in FIG.

[0047] Figure 6 1 is a schematic diagram of the structure of a measuring end (cut off in half) in an embodiment of the present invention;

[0048] Figure 7 yes Figure 6 A schematic diagram of the structure of the first connecting block (cut off in half);

[0049] Figure 8 yes Figure 6 Schematic diagram of the structure of the pressure cap (cut off in half);

[0050] Fig. 9 1 is a schematic structural diagram of a blocking end (cut off in half) in an embodiment of the present invention;

[0051] Fig.10 is a structural schematic diagram of a second connection block in an embodiment of the present invention;

[0052] Fig.11 is a schematic structural diagram of a push rod in an embodiment of the present invention;

[0053] Fig.12 It is a structural schematic diagram of a push block in an embodiment of the present invention;

[0054] Fig.13 is a structural schematic diagram of a base in an embodiment of the present invention;

[0055] Fig.14 yes Fig.13 The enlarged schematic diagram of the C part in FIG.

[0056] Fig.15 is a structural schematic diagram of a cover body in an embodiment of the present invention;

[0057] Fig.16 is a schematic structural diagram of a layering strip in an embodiment of the present invention;

[0058] Fig.17 A cross-sectional schematic diagram of a road surface weighing sensor device installed on a road surface in an embodiment of the present invention.

[0059] In the figure:

[0060] 1: base;

[0061] 11: first through groove;

[0062] 111: first tank body;

[0063] 112: second tank body;

[0064] 113: First step;

[0065] 2: Cover plate;

[0066] 21: second through slot;

[0067] 22: first cover body section;

[0068] 23: second cover body section;

[0069] 24: The second step;

[0070] 25: substrate layer;

[0071] 26: thickness adjustment layer;

[0072] 3: Layering;

[0073] 31: dustproof sealing cover;

[0074] 4: Capsules;

[0075] 5: Measuring end;

[0076] 51: sensor;

[0077] 52: first connection block;

[0078] 521: first mounting hole;

[0079] 522: Annular column;

[0080] 53: pressure cap;

[0081] 54: first protective cover;

[0082] 541: cable hole;

[0083] 55: pressure equalizing diaphragm;

[0084] 6: blocking end;

[0085] 61: second connection block;

[0086] 611: second mounting hole;

[0087] 62: Putt;

[0088] 621: Hexagon socket countersunk hole;

[0089] 63: Push block;

[0090] 64: second protective cover;

[0091] 7: Vibration isolation plate;

[0092] 8: Road surface. DETAILED DESCRIPTION

[0093] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0094] like Figure 3 to Figure 5 As shown, the road weighing sensor device provided by the embodiment of the present invention includes a base 1, a cover plate 2, two pressure strips 3, a capsule 4, a measuring end 5 and a blocking end 6.

[0095] See also Figure 3 , Fig.13 and Fig.14 As shown, the base 1 is provided with a first through groove 11, and the first through groove 11 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 located in the first through groove 11 is formed at the intersection of the first groove body 111 and the second groove body 112.

[0096] See also Figure 4 , Figure 5 and Fig.15 As shown, the cover plate 2 is provided with a second through groove 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 groove opening of the second through groove 21 to the groove 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 junction of the first cover body section 22 and the second cover body section 23. The cover plate 2 is placed in the first groove body 111, and the second through groove 21 is connected to the second groove body 112 with the groove openings facing each other, forming an accommodating space.

[0097] See also Figure 3 , Figure 5 and Fig.16 As shown, two pressure strips 3 are detachably mounted on both sides of the slot of the first slot body 111 by screws, and a part of them is located above the first slot body 111. In order to improve the sealing effect, preferably, a dustproof sealing cover 31 is provided at the fixing screw of the pressure strip 3.

[0098] See also Figure 4 and Figure 5 As shown, the capsule 4 is placed in the accommodating space, and the inside of the capsule 4 is provided with a liquid for transmitting pressure, which has a certain pressure to lift the cover plate 2, so that the second steps 24 on both sides of the cover plate 2 are respectively against the two pressure strips 3, and the cover plate 2 is spaced from the first step 113. When the cover plate 2 is pressed, it moves downward or has a tendency to move downward, so that the capsule 4 is compressed and deformed. When the deformation of the capsule 4 exceeds the preset value, the cover plate 2 is against the first step 113, so that the pressure is transmitted to the base 1, so as to avoid the damage of the capsule 4 due to excessive load, thereby ensuring the safety and continuous availability of the road weighing sensor device. In one example, the rated load is set to 40 tons, and correspondingly, the deformation of the capsule 4 is safe at this time, and at this time, the cover plate 2 is not in contact with the first step 113. When the car is seriously overloaded, for example, when the actual load exceeds 100 tons or more, the cover plate 2 is against the first step 113 to prevent the capsule 4 from being crushed.

[0099] Due to the structure of the present invention, the material requirements for the capsule are greatly reduced, and the commonly used flexible film materials in the prior art can basically meet the use requirements. In this embodiment, the capsule 4 is made of commonly used flexible materials in the prior art, such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, latex, nitrile rubber, etc., and is filled with a liquid for pressure transmission. The above is only an example and is not a specific limitation on the material of the capsule 4.

[0100] 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 groove body 112 and the second through groove 21 are matching semicircular or approximately semicircular arcs to achieve a more fitting package.

[0101] In this embodiment, the liquid used for transmitting pressure is a liquid with stable performance over temperature, low volatility, small pressure change or regular change, such as hydraulic oil.

[0102] See also Figure 3 and Figure 4 As shown, the measuring end 5 and the blocking end 6 are respectively located at the two ends of the accommodation space. The measuring end 5 has a sensor 51, which is located outside the capsule 4. The measuring end face of the sensor 51 is against the end of the capsule 4, and is used to measure the pressure change of the capsule 4. The blocking end 6 is used to block the accommodation space at this end, and is used to limit the capsule 4.

[0103] See also Fig.17As shown, when in use, the strip-shaped road weighing sensor device is arranged perpendicular to the driving direction of the vehicle. Specifically, the road weighing sensor device is embedded in the road surface 8, and the upper surface of the cover plate 2 is flush with the road surface 8, so as not to cause vibration of the vehicle. The capsule 4 with a certain pressure is confined in the accommodation space. When the vehicle passes the road weighing sensor device, the cover plate 2 moves downward to reduce the volume of the accommodation space. The volume change is in a certain (linear) relationship with the weight of the vehicle tire rolling. The volume reduction of the accommodation space causes the capsule 4 to deform in the limited space, generating a pressure increment. The pressure increment is in another certain (linear) relationship with the compression deformation of the accommodation space. The measuring end face of the sensor 51 senses this pressure increment, and the data processing system detects and processes the output signal of the sensor 51. The output signal of the sensor 51 is in a unique and certain (linear) relationship with the vehicle tire load. After the preliminary calibration, the calibration data is obtained, and the vehicle tire weight is obtained by using the data processing system, and then the vehicle axle weight and the entire vehicle weight are obtained.

[0104] 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 pressure to the capsule 4 when the cover plate 2 is under force. The first step 113 cooperates with the cover plate 2 to achieve overload protection, reduce the probability of damage to the road weighing sensor device, improve safety, reduce the requirements for the material strength of the capsule 4, and thus reduce 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.

[0105] 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 invention and is not required here.

[0106] 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 5 and Fig.15 As shown, the cover plate 2 includes a substrate layer 25 and a thickness adjustment layer 26, the second through groove 21 is opened on the first side of the substrate layer 25, and the thickness adjustment layer 26 is arranged on the second side of the substrate layer 25, and the second side is opposite to the first side. 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 of different thicknesses.

[0107] In another example, the cover plate 2 includes a substrate layer 25 and a thickness adjustment layer 26, and 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 the installation is completed, the thickness of the cover plate 2 can be adjusted by grinding the thickness adjustment layer 26. Preferably, the grinding material is preferably a material close to the hardness of the road surface. In a specific embodiment, the thickness adjustment layer 26 is formed by mixing and pouring 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 prior art.

[0108] In a preferred embodiment, a dovetail groove is provided on the second side of the substrate layer 25, and an embedded block matching the dovetail groove is provided on the thickness adjustment layer 26, and the thickness adjustment layer 26 is connected to the substrate layer 25 by embedding the embedded block into the dovetail groove. In the embodiment in which the substrate layer 25 and the thickness adjustment layer 26 are detachably connected, the dovetail groove and the embedded block are matched to facilitate replacement and assembly, and increase the tightness and reliability of the connection. In the embodiment in which the thickness adjustment layer 26 is cast on the substrate layer 25, the dovetail groove and the embedded block are matched to make the connection between the two more secure.

[0109] In this embodiment, the measuring end 5 can realize 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 realize it. For example, a stopper is installed at the end of the base 1, and a mounting hole is opened on the stopper for installing 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 fixed by welding or detachable. Figure 4 and Figure 6 to Figure 8 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 installed on the end face of the base 1 by screws. The first connecting block 52 is provided with a first mounting hole 521 that penetrates the first connecting block 52 and is connected to the accommodating space. The end of the first connecting block 52 away from the base 1 is provided with an annular column 522 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 with the annular column 522, and the sensor 51 is installed in the first mounting hole 521, and 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 you want to further improve the sealing performance, you can set a sealing ring and / or sealant at the connection of each part to ensure that the road weighing sensor device is protected and protected from moisture during storage, transportation, installation and other links. For example, a sealing ring is set between the first connecting block 52 and the base 1 and the cover plate 2, or a sealant is filled between the first connecting block 52 and the base 1 and the cover plate 2.

[0110] In a preferred embodiment, see Figure 4 and Figure 6As shown, the measuring end 5 also includes a first protective cover 54, one end of the first protective cover 54 is an open end, 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 the end of the pressure cap 53 is provided with a through hole for the sensor 51 to pass through (see Figure 6 and Figure 8 As shown in the figure, the first protective cover 54 covers the outer side of the pressure cap 53 and is threadedly connected to the pressure cap 53, and the open end is against the first connection 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 also convenient to further seal on this basis when necessary. For example, a sealing ring is provided between the first protective cover 54 and the first connection 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, thereby avoiding the inconvenience caused by the long signal cable of the strip-type quartz weighing sensor in the calibration, storage, transportation, installation and other links.

[0111] Of course, in some examples, wireless signal transmission may also be utilized, in which case there is no need to provide a wire hole for the cable to pass through.

[0112] Since the capsule 4 may form some tiny wrinkles when deforming, if the wrinkles are different each time it deforms, it may cause the measurement results to be slightly different. In order to further improve the measurement accuracy of the sensor 51, in one example, see Figure 6 As shown, the measuring end 5 also includes a pressure-equalizing diaphragm 55, the hardness of which is greater than the hardness of the material of the capsule 4. The pressure-equalizing diaphragm 55 is arranged on a side of the first connecting block 52 facing the capsule 4, and 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, thereby offsetting the influence 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 influence of the selected pressure-equalizing diaphragm 55 on the frequency response of the sensor 51 should be within the allowable range to avoid failure 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 0.2 mm polyurethane sheet or a 0.1 mm aluminum sheet.

[0113] It is worth noting that the above 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.

[0114] 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.

[0115] 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 4 , Figures 9 to 12 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.

[0116] In one example, see Fig. 9 and Fig.10 As shown, the second connection block 61 is provided with a second mounting hole 611 that penetrates the second connection block 61 and communicates with the accommodation space. The second mounting hole 611 is a threaded hole. The outer portion 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 of the push rod 62 is against the capsule 4. By rotating the push rod 62, the length of the push rod 62 extending into the accommodation 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 Fig.11 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.

[0117] In another example, the push rod 62 is an electric telescopic rod, and the second connection block 61 is provided with a second mounting hole 611 that penetrates the second connection block 61 and communicates with the accommodation space. The telescopic end of the electric telescopic rod passes through the second mounting hole 611 and extends into the accommodation space and abuts against the capsule 4. The length of the push rod 62 extending into the accommodation space is adjusted by telescoping the push rod 62, thereby adjusting the static (initial) pressure of the capsule 4. Of course, in one example, a structure such as a ball screw can also be used to adjust the static (initial) pressure of the capsule 4.

[0118] For some examples, see Fig. 9 As shown, a push block 63 is provided at the front end of the push rod 62, and the size of the push block 63 is larger than the size of the cross section of the push rod 62. The push rod 62 is pressed against the capsule 4 through the push block 63 to increase 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.

[0119] 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 an end face of the push block 63 facing the capsule 4 .

[0120] To better protect the plugging end, see Fig. 9 As shown, in one example, the blocking end 6 further includes a second protective sleeve 64, the second protective sleeve 64 is provided with an internal thread, one end of the push rod 62 located outside the accommodation space is provided with 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, and the second protective sleeve 64 is against the second connection block 61. In order to improve the sealing effect, in one example, a sealing structure such as a sealing gasket or a sealant can be provided between the second protective sleeve 64 and the second connection block 61.

[0121] Of course, in some embodiments, pressure regulation can also be achieved by increasing or decreasing the thickness or number of cushion blocks in the accommodation space where the blocking end 6 is located.

[0122] 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.

[0123] 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 dock 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.

[0124] In order to isolate the influence of road vibration on the output of road weighing sensor device and reduce the interference of road vibration on measurement, in one example, see Figure 5 and Fig.17 As shown, a vibration isolation plate 7 is provided on the outer side of the base 1. Theoretically, any structure with shock absorption and vibration isolation in the prior art can achieve a certain effect. In a specific embodiment, the vibration isolation plate 7 is a vibration isolation plate with a certain flexibility, for example, it is made of a foam material that is resistant to sun and rain and durable. The specific material is not limited here. Preferably, the vibration isolation plate 7 is flush with the road surface 8 in the height direction, that is, the height is equal to the sum of the heights of the base 1 and the pressure strip 3, so as not to cause vibration of the car.

[0125] Any details not described in detail in the present invention are common knowledge or prior art in the art.

[0126] 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.

[0127] 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 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 located in the first through slot is formed at the intersection of the first slot body and the second slot body; The cover plate is provided with a second through groove, and is divided into a first cover body section and a second cover body section on the outer side of the cover plate along the direction from the notch of the second through groove to the groove bottom, the width of the first cover body section is greater than the width of the second cover body section, and a second step is formed at the intersection of the first cover body section and the second cover body section, and the cover plate is placed in the first groove body, and the second through groove is connected with the second groove body, and the notches are opposite to each other, so as to form an accommodation space; Two pressure strips are detachably arranged on both sides of the notch of the first slot body, and a part of them is located above the first slot 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 up the cover plate so that the second steps on both sides of the cover plate are respectively against the two pressure strips, and there is a gap between the cover plate and the first step; A measuring end, which is sealed at one end of the accommodating space and fixedly connected to the base, wherein the cover plate can move relative to the measuring end, and the measuring end has a sensor and is located outside the capsule for measuring pressure changes of 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 a first side surface of the substrate layer, the thickness adjustment layer is arranged on a second side surface of the substrate layer, and 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 of the substrate layer, an embedding block matching the dovetail groove is provided on the thickness adjustment layer, and the thickness adjustment layer is embedded in the dovetail groove and connected to the substrate layer via the embedding block.

4. The road 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 comprises a sensor, a first connecting block, a pressure cap and a first protective sleeve, wherein the first connecting block is mounted on the end surface of the base by means of screws, the first connecting block is provided with a first mounting hole penetrating the first connecting block and communicating with the accommodating space, an annular column coaxial with the first mounting hole is provided at one end of the first connecting block away from the base, an external thread is provided on the outer side of the annular column, the pressure cap is threadedly connected with 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 abuts against 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 comprises a pressure equalizing diaphragm, which is arranged on a side of the first connecting block facing the capsule, has a size 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 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 arranged on the outer side of the base.

8. The road weighing sensor device according to claim 1, characterized in that: The blocking end comprises a second connection block, a push rod and a second protective sleeve, wherein the second connection block is mounted on the end surface of the base by screws, the push rod is mounted on the second connection block, 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, 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 one end of the push rod 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, and 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 penetrating the second connecting block and communicating 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 matched with the second mounting hole and one end of the push rod is against the capsule, and 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 penetrates the second connecting block and is connected to the accommodating space, and the telescopic end of the electric telescopic rod passes through the second mounting hole, extends into the accommodating space and abuts against the capsule.

10. The road 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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