Road passing vehicle safety detection method

Abstract

The invention discloses a road passing vehicle safety detection method, which comprises a vehicle size safety detection step and a vehicle weight safety detection step, and is characterized in that during vehicle size safety detection, a height limiting rod is adopted to detect the height of a vehicle, and meanwhile, a non-contact measurement mode is adopted to detect the width of the vehicle. The method has the characteristics of more comprehensive detection and higher safety, and can better guarantee traffic safety, protect road facilities and optimize road management.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle driving safety detection, and particularly relates to a method for detecting the safety of passing vehicles on a road. Background Art

[0002] With the continuous advancement of China's urbanization process and the sustainable development of the national economy, the number of freight vehicles is increasing day by day. At the same time, the traffic safety problems of freight vehicles are becoming increasingly prominent in social life. Tunnels, bridge openings, and viaducts are basic components of road traffic and are very common in modern urban road networks.

[0003] The existing vehicle passing safety detection generally focuses on two aspects: vehicle external dimension detection and vehicle weight detection. Among them, for the safety detection of vehicle external dimensions, generally, in the case where the road will pass through areas such as tunnels or bridge openings, if the height and width of the vehicle are not appropriate, it cannot pass, so prior detection is required to ensure safety. And vehicle weight detection is generally used in situations where the vehicle needs to be weight-limited due to geological reasons on some road surfaces or due to the need to pass through bridges with weight limits. For the safety detection of vehicle external dimensions, currently, it is generally achieved by using height-limiting gates and width-limiting gates, that is, a gate library with a limited height and width is used. If the vehicle can drive through, it is judged to be safe. This detection method is very simple and direct, but there is also a major defect, that is, the passing situation of the height-limiting gate or width-limiting gate is not the same as that of the tunnel or bridge opening. The height-limiting gate or width-limiting gate has a very short dimension in the length direction and passes instantaneously, but the tunnel or bridge opening has a very long dimension in the length direction, and the vehicle will drive in it for a certain period of time, and there are often turning road surfaces. This may have little impact on the height-limiting gate, but for the width-limiting gate, it is easy to occur that although the driver's operation to pass through the width-limiting gate is okay, when actually passing through the tunnel, due to the longer distance, it is easy to cause the two sides of the vehicle to rub against the tunnel wall, resulting in inaccurate detection and low safety.

[0004] In addition, for vehicle weight detection, currently, a floating plate is generally set on the road surface, and a gravity sensor is set below the floating plate. Then the vehicle is driven onto the floating plate, and the vehicle weight is directly collected by the gravity sensor and compared with the safety threshold to achieve detection. This detection method also has the following defects: First, the weight sensor works in a long-term high-pressure and dusty environment, with poor stability, easy to malfunction or become inaccurate, and has a low service life. Second, this detection method only detects the vehicle weight, but in fact, the widths and even the numbers of tires of different vehicles are different, resulting in different pressures on the road surface when the vehicle is driving. Therefore, the vehicle weight size does not represent the pressure size of the vehicle on the road surface. And the destructive power of the vehicle on the road surface is not only related to the vehicle weight, but more often is also related to the pressure size of the vehicle on the road surface. Therefore, the current method of only detecting the vehicle weight to judge the damage ability to the road surface ignores the influence of vehicle pressure and has poor accuracy. Summary of the Invention

[0005] Aiming at the above deficiencies, the technical problem to be solved by the present invention is: how to provide a road traffic vehicle safety detection method with more comprehensive detection and higher safety, so that it can better ensure traffic safety, protect road facilities and optimize road management.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A road traffic vehicle safety detection method includes a vehicle size safety detection step and a vehicle weight safety detection step. It is characterized in that when detecting the vehicle size safety, a height limit bar is used to detect the vehicle height, and at the same time, a non-contact measurement method is used to detect the vehicle width.

[0007] In this way, during the driving process of the vehicle in the tunnel, the height will not change, so it is more convenient and fast to directly use the height limit bar for detection. However, if the width direction detection also adopts the width limit method, there will be a defect that it is easy to pass during detection, but it is difficult to detect accurately because of the long tunnel length and the resulting rubbing when actually passing through the tunnel. Therefore, in this application, a non-contact measurement method is used to detect the vehicle width. In this way, a larger error tolerance range can be added to the width judgment threshold during comparison and judgment, which can better improve the detection accuracy and ensure safety.

[0008] Furthermore, when detecting the vehicle weight safety, first detect the vehicle weight and compare it with the weight safety threshold for safety judgment, and then detect the average pressure value of the vehicle on the road surface and compare it with the average pressure safety threshold of the road surface for safety judgment.

[0009] This is because for some road surfaces with potential subgrade safety hazards, the collapse of the road surface is not only related to the weight of the passing vehicle, but also related to the average pressure value of the vehicle on the road surface. Therefore, in this method, when arranging the judgment of the vehicle weight, in addition to detecting the vehicle weight for judgment, the average pressure value of the vehicle on the road surface is also detected for safety judgment, which can better ensure the road surface safety and improve the detection reliability. The safety threshold can be obtained in advance through calculation or actual measurement of the road surface.

[0010] Furthermore, the vehicle size safety detection is realized by means of a vehicle size safety detection device. The vehicle size safety detection device includes a passing gate arranged along the width direction of the driving road surface. The passing gate includes two vertical rods arranged on both sides. The distance between the two vertical rods is greater than the vehicle safety width threshold. It also includes a height limit rod horizontally arranged above the two vertical rods. The height limit rod is located at the vehicle safety height threshold position. A row of laser sensors is arranged along the length direction on the lower surface of the height limit rod. The laser sensors include a laser emitter for emitting laser downward and a corresponding laser detector for receiving the reflected laser. Each laser emitter is arranged in a row in a close-fitting manner and is arranged at intervals before and after the corresponding row of laser detectors. The laser detectors are connected to the control center.

[0011] In this way, in the vehicle size safety detection device, for the vehicle height dimension, the height limit rod is directly used for detection because the height of the vehicle usually does not change during the driving in the tunnel. Therefore, the height limit rod is directly used to detect the vehicle height safety dimension, which is convenient for detection and low in cost. At the same time, for the vehicle width dimension, a row of laser sensors is used for detection. The laser emitter in the laser sensor above the vehicle emits laser, which is reflected by the vehicle and then received by the laser detector. The laser emitter in the laser sensors on both sides of the vehicle emits laser, which is reflected by the road surface and then received by the laser detector. The control center is provided with a vehicle width detection module. The vehicle width detection module can count the time intervals for each laser detector to receive the laser signal, and obtain the position of the area corresponding to the laser detector in the vehicle width direction from the difference in the time intervals for each laser detector to receive the laser signal, and then obtain the vehicle width dimension. The vehicle width dimension is compared with the vehicle width safety threshold. When the vehicle width dimension is less than the vehicle width safety threshold, a safety alarm is issued. Therefore, in this way, by combining the physical detection and the non-contact laser measurement detection method, the vehicle size safety detection can be better realized, and a better safety judgment can be obtained for the vehicle to pass through the tunnel.

[0012] Furthermore, a proximity switch is also arranged inside the height limit rod. The proximity switch is serially installed on the start control circuit of the laser sensor.

[0013] In this way, the laser sensor can be started for detection when a vehicle approaches. Usually, the laser sensor is in the off state.

[0014] Further, the vehicle weight safety detection is realized by a vehicle weight detection device. The vehicle weight detection device includes a horizontally arranged floating pressure plate. The lower part of the floating pressure plate is floatingly supported on the road surface by uniformly arranged vertical springs. A pressure rod is vertically and downwardly fixedly arranged at the middle position of the lower surface of the floating pressure plate. The lower end of the pressure rod can be inserted into a detection cavity which is enclosed below the road surface in a vertically slidable manner. A pressure detection device for detecting the magnitude of the downward pressure of the pressure rod is arranged in the detection cavity.

[0015] In this way, by installing the pressure detection device in a sealed detection cavity, the influence of road dust can be shielded, greatly ensuring its detection accuracy and extending its service life.

[0016] Further, the pressure detection device includes a detection lever arranged horizontally. The fulcrum position of the detection lever is hinged and installed on a lever support. The end of the long arm of the detection lever has a conductive section, and a sliding contact is arranged on the conductive section. The lower end of the pressure rod is pressed against the short arm end of the detection lever. The pressure detection device further includes an arc-shaped resistor, which is arranged along the rotation direction of the end of the long arm of the detection lever. A chute is arranged on the arc-shaped resistor and slidably cooperates with the sliding contact. One end of the arc-shaped resistor and the conductive section are connected to a resistance detection circuit module, and the resistance detection circuit module is connected to the control center.

[0017] In this way, when the vehicle presses down, it drives the pressure rod to press down. After the action distance is amplified by the detection lever, it drives the sliding contact to slide in the chute. By detecting the change in the resistance value of the arc-shaped resistor, during the process of the vehicle driving through the floating pressure plate, the extreme resistance value detected can be fed back to obtain the maximum downward pressure value of the pressure rod. This value has a one-to-one correspondence with the vehicle weight, and thus the vehicle weight can be obtained through the previously measured corresponding relationship. In this way, by magnifying through the lever and detecting the resistance size based on the principle of the resistor, the vehicle weight size is obtained, which has higher detection reliability and sensitivity, and the principle is simple, the implementation is convenient, and the cost is low.

[0018] Further, an insertion port is arranged at the upper end of the detection cavity for the pressure rod to be inserted. A flexible sealing skin is hermetically arranged between the periphery of the insertion port and the pressure rod.

[0019] In this way, while better ensuring the seal, it does not affect the force application of the pressure rod. The detection cavity is in a completely sealed and isolated state from the outside world, better ensuring the reliability, accuracy and service life of the pressure detection device.

[0020] Further, an inclined connecting plate is hinged to each of the front and rear ends of the floating pressure plate and is connected to the road surface. This facilitates the vehicle to drive more smoothly onto the floating pressure plate.

[0021] Furthermore, a roller is provided at one end of the inclined slab in contact with the road surface. In this way, the lower end of the inclined slab and the road surface are in rolling contact, which does not affect the pressing down of the floating pressing plate.

[0022] Furthermore, a vehicle pressure detection device is also provided in the vehicle weight detection device. The vehicle pressure detection device includes two parallel detection belts arranged corresponding to the vehicle's two side wheels on the floating pressing plate. The inner distance between the two detection belts is less than the minimum inner distance of the vehicle's wheels, and the outer distance between the two detection belts is greater than the maximum outer distance of the vehicle's wheels. A number of pressure sensors are evenly arranged in an array within the detection belts, and each pressure sensor is connected to the control center.

[0023] In this way, the control center sets a corresponding pressure detection program. When the vehicle passes over the detection belts during driving, it can sense the number of pressure sensors under pressure. According to the planar density of the installed pressure sensors, the contact area between the vehicle's wheels and the ground is obtained through conversion. Then, based on the vehicle weight obtained by the previous pressure detection device, the average pressure of the vehicle on the road surface is obtained through conversion. Then, the detected vehicle pressure value is compared with the judged pressure safety threshold. If it is greater than the pressure safety threshold, it is judged that there is a safety problem and an alarm is issued. The pressure safety threshold is calculated based on the actual bearing capacity of the road surface that has requirements for vehicle pressure on the road (such as some special material road surfaces or road sections with poor geological strength or bridge road surfaces). In this way, it can better ensure the driving safety of vehicles on special road surfaces with bearing requirements.

[0024] Furthermore, an installation groove is integrally provided within the detection belt, and the pressure sensor is installed in the installation groove. An elastic skin is hermetically provided on the upper surface of the installation groove.

[0025] In this way, the pressure sensor is hermetically set, which better realizes protection, ensures its detection accuracy and stability, and improves its service life.

[0026] Furthermore, a matching installation sink is provided at the bottom of the installation groove corresponding to each pressure sensor, and each pressure sensor is installed in the corresponding installation sink. When the pressure sensor is not stressed, its upper surface protrudes above the upper surface of the installation sink. When the pressure sensor is compressed to the limit, its upper surface is lower than the upper surface of the installation sink.

[0027] In this way, the pressure sensor only bears part of the vehicle's pressure. After the vehicle presses the pressure sensor to the same height as the notch of the installation sink, it cannot be pressed down further. While not affecting its sensing detection, it greatly ensures the safety of the pressure sensor.

[0028] Furthermore, a non-Newtonian fluid is also filled between the upper surface of the pressure sensor and the elastic skin within the installation groove.

[0029] In this way, the non-Newtonian fluid has the property of shear thickening, where the greater the external force, the higher the viscosity. Therefore, when the vehicle is heavier, the viscosity of the non-Newtonian fluid is greater. Since the pressure sensor is installed in the installation sink at a relatively deep position, and the pressure sensor is usually circular, the corresponding installation sink is circular, and there are non-installation areas between the installation sinks. The distance between the non-installation area and the elastic skin is short, and when the vehicle is pressurized, the viscosity of the non-Newtonian fluid increases. Therefore, a rigid support can be better formed between the non-installation area and the elastic skin to protect the pressure sensor. At the same time, the characteristics of the non-Newtonian fluid make the support hardness higher when the vehicle is heavier and more pressurized. In this way, when a particularly heavy vehicle passes by, it can also provide good protection for the pressure sensor, avoiding it being crushed by the vehicle while not affecting its detection of the pressure transmission signal.

[0030] Therefore, the present invention can quickly detect the external dimensions, weight of the vehicle, and the average pressure of the wheels on the road surface before the vehicle passes, and then predict whether it can pass through the target section smoothly and safely, providing timely support for traffic management departments with passing data, and thus maximizing the avoidance of traffic accidents of the above-mentioned type of vehicles. Therefore, the present invention has important practical significance for ensuring traffic safety, protecting road facilities, and optimizing road management, and can effectively improve the overall operation efficiency and safety of the traffic system.

[0031] In summary, the present invention has the characteristics of more comprehensive detection and higher safety, and can better ensure traffic safety, protect road facilities, and optimize road management. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the vehicle size safety detection device adopted in the preferred embodiment of the present invention.

[0033] Figure 2 For Figure 1 It is an enlarged partial structural diagram of the lower surface of the single height limit bar in

[0034] Figure 3 It is a schematic structural diagram of the vehicle weight detection device adopted in the preferred embodiment of the present invention.

[0035] Figure 4 For Figure 3 It is an enlarged partial structural diagram of the single pressure detection device in

[0036] Figure 5 It is a schematic structural diagram of the vehicle pressure detection device adopted in the preferred embodiment of the present invention.

[0037] Figure 6 For Figure 5 It is a cross-sectional structural diagram of the single installation groove in DETAILED DESCRIPTION OF THE INVENTION

[0038] The present invention will be further described in detail below in conjunction with specific embodiments.

[0039] Preferred embodiment: A method for safety detection of road passing vehicles, including a vehicle size safety detection step and a vehicle weight safety detection step. The feature is that when detecting the vehicle size safety, a height limit bar is used to detect the vehicle height, and at the same time, a non-contact measurement method is used to detect the vehicle width.

[0040] In this way, during the driving process of the vehicle in the tunnel, the height will not change, so it is more convenient and fast to directly use the height limit bar for detection. However, if the width direction detection liquid also uses the width limit method, there will be a defect that it is easy to pass during detection, but due to the long length of the tunnel during actual tunnel passage, there will be rubbing, so it is difficult to detect accurately. Therefore, in this application, a non-contact measurement method is used to detect the vehicle width. In this way, a larger error tolerance range can be added to the width judgment threshold during comparison and judgment, which can better improve the detection accuracy and ensure safety.

[0041] Among them, when detecting the vehicle weight safety, first detect the vehicle weight and compare it with the weight safety threshold for safety judgment, and then detect the average pressure value of the vehicle on the road surface and compare it with the average pressure safety threshold of the road surface for safety judgment.

[0042] This is because for some road surfaces with potential roadbed safety hazards, the collapse of the road surface is not only related to the weight of the passing vehicle, but also related to the average pressure value of the vehicle on the road surface. Therefore, when this method arranges the judgment of the vehicle weight, in addition to detecting the vehicle weight for judgment, it also detects the average pressure value of the vehicle on the road surface for safety judgment, which can better ensure the road surface safety and improve the detection reliability. The safety threshold can be obtained in advance through calculation or actual measurement of the road surface.

[0043] Specifically, when implementing this method, a road passing vehicle safety detection system is used. See Figures 1-6 As shown, the road passing vehicle safety detection system includes a vehicle size safety detection device and a vehicle weight detection device; The vehicle size safety detection device includes a passing gate arranged along the width direction of the driving road surface. The passing gate includes two vertical rods 1 arranged on both sides vertically. The distance between the two vertical rods 1 is greater than the vehicle safety width threshold. It also includes a height limit bar 2 arranged horizontally above the two vertical rods 1. The height limit bar 2 is located at the vehicle safety height threshold position. A row of laser sensors is arranged along the length direction on the lower surface of the height limit bar 2. The laser sensors include laser emitters 3 arranged downward for emitting laser and corresponding laser detectors 4 for receiving reflected laser. Each laser emitter 3 is arranged in a row in a close arrangement and is arranged at intervals before and after the corresponding row of laser detectors 4. The laser detector 4 is connected to a control center (not shown in the figure).

[0044] In this way, in the vehicle size safety detection device, for the vehicle height dimension, a height limit bar is directly used for detection because the height of the vehicle usually does not change during the driving process in the tunnel. Therefore, the height limit bar is directly used to detect the vehicle height safety dimension, which is convenient for detection and has low cost. At the same time, for the vehicle width dimension, a row of laser sensors is used for detection. The laser emitter in the laser sensor above the vehicle emits laser light, which is irradiated onto the vehicle and then received by the laser detector after reflection. The laser emitter in the laser sensors on both sides of the vehicle emits laser light, which is irradiated onto the road surface and then received by the laser detector after reflection. The control center is provided with a vehicle width detection module. The vehicle width detection module can count the time intervals for each laser detector to receive the laser signal, and obtain the position of the area corresponding to the laser detector in the vehicle width direction from the difference in the time intervals for each laser detector to receive the laser signal, thereby obtaining the vehicle width dimension. Then, the vehicle width dimension is compared with the vehicle width dimension safety threshold. When the vehicle width dimension is less than the vehicle width dimension safety threshold, a safety alarm is issued. Therefore, in this way, by combining the physical detection and the non-contact laser measurement detection method, the vehicle size safety detection can be better realized, and a better safety judgment can be obtained for the vehicle to pass through the tunnel.

[0045] Among them, a proximity switch 5 is further arranged inside the height limit bar 2, and the proximity switch 5 is serially installed on the start control circuit of the laser sensor.

[0046] In this way, the laser sensor can be started for detection when a vehicle approaches. Usually, the laser sensor is in the off state.

[0047] Among them, the vehicle weight detection device includes a horizontally arranged floating pressure plate 6. The floating pressure plate 6 is floatingly supported on the road surface by uniformly arranged vertical springs 7 below. A pressure rod 8 is vertically and downwardly fixedly arranged at the middle position of the lower surface of the floating pressure plate 6. The lower end of the pressure rod 8 can be inserted into a detection cavity 9 which is enclosed and arranged below the road surface in a vertically sliding manner. A pressure detection device for detecting the magnitude of the downward pressure of the pressure rod 8 is arranged in the detection cavity 9.

[0048] In this way, by installing the pressure detection device in a sealed detection cavity, the influence of road dust can be shielded, which greatly ensures its detection accuracy and extends its service life.

[0049] Among them, the pressure detection device includes a detection lever 10 arranged horizontally. The fulcrum position of the detection lever 10 is hinged and installed on a lever support 11. The whole detection lever is made of insulating material and has a conductive section 12 at the end of its long arm. A sliding contact is arranged on the conductive section 12. The lower end of the pressure rod 8 is crimped on the short arm end of the detection lever. The pressure detection device further includes an arc-shaped resistor 13 arranged along the rotation direction of the end of the long arm of the detection lever. A chute is arranged on the arc-shaped resistor 13 and slidably cooperates with the sliding contact. One end of the arc-shaped resistor 13 and the conductive section are connected to a resistance detection circuit module 14, and the resistance detection circuit module 14 is connected to the control center.

[0050] In this way, when the vehicle presses down, it drives the pressure rod to press down. After amplifying the action distance through the detection lever, it drives the sliding contact to slide in the chute. By detecting the change in the resistance value of the arc-shaped resistor, during the process of the vehicle driving through the floating pressing plate, the maximum pressure value of the pressure rod downward can be obtained by feedback from the detected extreme resistance value. This value has a one-to-one correspondence with the vehicle weight, so the vehicle weight can be obtained through the previously measured corresponding relationship. In this way, after being amplified by the lever, the resistance size is detected based on the principle of the resistor to obtain the vehicle weight size, which has higher detection reliability and sensitivity, and the principle is simple, the implementation is convenient, and the cost is low.

[0051] Among them, an insertion port is arranged at the upper end of the detection cavity 9 for the pressure rod to be inserted, and a flexible sealing skin 15 is hermetically arranged between the periphery of the insertion port and the pressure rod.

[0052] In this way, while better ensuring the seal, it does not affect the force application of the pressure rod. The detection cavity is in a completely sealed state from the outside, better ensuring the reliability, accuracy and service life of the pressure detection device.

[0053] Among them, inclined connecting plates 16 are respectively hinged at the front and rear ends of the floating pressing plate 6 and are in contact with the road surface. This facilitates the vehicle to drive more smoothly onto the floating pressing plate.

[0054] Among them, rollers 17 are arranged at the end of the inclined connecting plate 16 in contact with the road surface. In this way, the lower end of the inclined connecting plate is in rolling contact with the road surface, so as not to affect the pressing down of the floating pressing plate.

[0055] The vehicle weight detection device further includes a vehicle pressure detection device. The vehicle pressure detection device includes two parallel detection belts 18 installed on the floating pressing plate 6 and corresponding to the vehicle wheels on both sides. The inner distance between the two detection belts 18 is less than the minimum inner distance of the vehicle wheels, and the outer distance between the two detection belts is greater than the maximum outer distance of the vehicle wheels. A number of pressure sensors 19 are uniformly arranged in an array within the detection belt 18, and each pressure sensor 19 is connected to the control center.

[0056] In this way, the control center sets the corresponding pressure detection program. When the vehicle passes over the detection strip, it can sense the number of pressure sensors under pressure. According to the planar density of the pressure sensors installed, the contact area between the vehicle wheels and the ground is obtained through conversion. Then, based on the vehicle weight obtained by the previous pressure detection device, the average pressure of the vehicle on the road surface is obtained through conversion. The detected vehicle pressure value is compared with the judged pressure safety threshold. If it is greater than the pressure safety threshold, it is judged that there is a safety problem and an alarm is issued. The pressure safety threshold is calculated based on the actual bearing capacity of the road surface that has requirements for vehicle pressure on the road (such as some special material road surfaces or road sections with poor geological strength or bridge road surfaces). In this way, it can better ensure the driving safety of vehicles on special road surfaces with bearing requirements.

[0057] Among them, an installation groove 20 is integrally arranged in the detection strip 18, the pressure sensor 19 is installed in the installation groove, and an elastic skin 21 is hermetically arranged on the upper surface of the installation groove 20.

[0058] In this way, the pressure sensor is hermetically arranged, which better realizes protection, ensures its detection accuracy and stability, and improves its service life.

[0059] Among them, a matching installation sink 22 is arranged at the bottom of the installation groove 20 corresponding to each pressure sensor. Each pressure sensor 19 is installed in the corresponding installation sink 22. When the pressure sensor 19 is not under force, its upper surface protrudes from the upper surface of the installation sink. When the pressure sensor is compressed to the limit, its upper surface is lower than the upper surface of the installation sink.

[0060] In this way, the pressure sensor only bears part of the vehicle pressure. After the vehicle presses the pressure sensor to the same height as the notch of the installation sink, it cannot be pressed down further. While not affecting its sensing detection, it greatly ensures the safety of the pressure sensor.

[0061] Among them, a non-Newtonian fluid 23 is also filled and arranged between the upper surface of the pressure sensor and the elastic skin in the installation groove 20.

[0062] In this way, the non-Newtonian fluid has the characteristic of shear thickening. The greater the external force, the higher the viscosity. Therefore, the greater the vehicle weight, the greater the viscosity of the non-Newtonian fluid. Since the pressure sensor is installed in the installation sink and is in a relatively deep position, the pressure sensor is usually circular, and the corresponding installation sink is circular. There are non-installed areas between the installation sinks. The distance between the non-installed area and the elastic skin is short, and when the vehicle is under pressure, the viscosity of the non-Newtonian fluid becomes larger. Therefore, a rigid support can be better formed between the non-installed area and the elastic skin to protect the pressure sensor. At the same time, the characteristics of the non-Newtonian fluid make the support hardness higher when the vehicle is heavier and under greater pressure. In this way, when a particularly heavy vehicle passes by, it can also provide good protection for the pressure sensor, avoiding it being crushed by the vehicle while not affecting the transmission of the detected pressure signal.

[0063] Therefore, the present invention can quickly detect the external dimensions, weight, and average pressure of the wheels on the road surface of a vehicle before it passes, and then predict whether it can pass through the target section smoothly and safely, providing timely traffic data support for the traffic management department, thereby maximizing the avoidance of vehicle traffic accidents of the said type. Therefore, the present invention has important practical significance for ensuring traffic safety, protecting road facilities, and optimizing road management, and can effectively improve the overall operation efficiency and safety of the traffic system.

Claims

1. A method for safety detection of road passing vehicles, including a vehicle size safety detection step and a vehicle weight safety detection step, characterized in that, When performing vehicle size safety detection, a height limit bar is used to detect the height of the vehicle, and at the same time, a non-contact measurement method is used to detect the width of the vehicle.

2. The road traffic vehicle safety detection method according to claim 1, characterized in that, When performing vehicle weight safety detection, first, the vehicle weight is detected and compared with the weight safety threshold for safety judgment, and then the average pressure value of the vehicle on the road surface is detected and compared with the average road surface pressure safety threshold for safety judgment.

3. The road traffic vehicle safety detection method according to claim 1, characterized in that, The vehicle size safety detection is realized by a vehicle size safety detection device. The vehicle size safety detection device includes a passing gate arranged along the width direction of the driving road surface. The passing gate includes two vertical rods arranged vertically on both sides. The distance between the two vertical rods is greater than the vehicle safety width threshold. It also includes a height limit bar horizontally arranged above the two vertical rods. The height limit bar is located at the vehicle safety height threshold position. A row of laser sensors is arranged along the length direction on the lower surface of the height limit bar. The laser sensors include a laser emitter for emitting laser downward and a corresponding laser detector for receiving the reflected laser. Each laser emitter is arranged in a row in a close-fitting manner and is arranged at intervals before and after with the corresponding row of laser detectors. The laser detector is connected to the control center.

4. The road traffic vehicle safety detection method according to claim 3, characterized in that, A proximity switch is also arranged inside the height limit bar. The proximity switch is serially installed in the start control circuit of the laser sensor.

5. The road traffic vehicle safety detection method according to claim 1, wherein The vehicle weight safety detection is realized by a vehicle weight detection device. The vehicle weight detection device includes a horizontally arranged floating pressure plate. The floating pressure plate is floatingly supported on the road surface by uniformly arranged vertical springs below. A pressure rod is vertically and downwardly fixedly arranged at the middle position of the lower surface of the floating pressure plate. The lower end of the pressure rod can slide up and down and is inserted into a detection cavity which is enclosed and arranged below the road surface. A pressure detection device for detecting the magnitude of the downward pressure of the pressure rod is arranged in the detection cavity.

6. The road traffic vehicle safety detection method according to claim 5, wherein, The pressure detection device includes a detection lever arranged horizontally. The fulcrum position of the detection lever is hinged and installed on a lever support. The long arm end of the detection lever has a conductive section, and a sliding contact is arranged on the conductive section. The lower end of the pressure rod is pressed against the short arm end of the detection lever. The pressure detection device also includes an arc-shaped resistor arranged along the rotation direction of the long arm end of the detection lever. A chute is arranged on the arc-shaped resistor and slidably cooperates with the sliding contact. One end of the arc-shaped resistor and the conductive section are connected to a resistance detection circuit module, and the resistance detection circuit module is connected to the control center.

7. The road traffic vehicle safety detection method according to claim 5, characterized in that, An insertion port for the pressure rod to insert is arranged at the upper end of the detection cavity. A flexible sealing skin is hermetically arranged between the periphery of the insertion port and the pressure rod.

8. The road traffic vehicle safety detection method according to claim 5, wherein, An inclined boarding plate is hingedly arranged at each of the front and rear ends of the floating pressure plate and is in contact with the road surface; Rollers are arranged at the end of the inclined boarding plate in contact with the road surface.

9. The road traffic vehicle safety detection method according to claim 5, characterized in that, A vehicle pressure detection device is also arranged in the vehicle weight detection device. The vehicle pressure detection device includes two parallel detection belts arranged corresponding to the vehicle's two side wheels on the floating pressure plate. The inner distance between the two detection belts is less than the minimum inner distance between the vehicle's wheels, and the outer distance between the two detection belts is greater than the maximum outer distance between the vehicle's wheels. A number of pressure sensors are uniformly arranged in an array in the detection belts. Each pressure sensor is connected to the control center.

10. The road traffic vehicle safety detection method according to claim 9, wherein, An installation groove is integrally arranged in the detection belt, and the pressure sensor is installed in the installation groove. An elastic skin is hermetically arranged on the upper surface of the installation groove; Installation sinks matching the pressure sensors are arranged at the bottom of the installation groove, and the pressure sensors are installed in the corresponding installation sinks. When the pressure sensors are not stressed, their upper surfaces protrude above the upper surfaces of the installation sinks. When the pressure sensors are pressed to the limit, their upper surfaces are lower than the upper surfaces of the installation sinks; A non-Newtonian fluid is also filled and arranged between the upper surface of the pressure sensor and the elastic skin in the installation groove.

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