CN112330958A - Radio frequency detection method and device for vehicle traffic monitoring - Google Patents

Abstract

The invention discloses a radio frequency detection method and a radio frequency detection device for vehicle traffic monitoring, wherein the radio frequency detection method and the radio frequency detection device comprise a first speed reducer, a second speed reducer, a third speed reducer, an annular detection coil, an electric barrier machine, a control cabinet and a distance measurement module, wherein the first speed reducer, the second speed reducer and the third speed reducer are sequentially arranged on the surface of a road, and the annular detection coil is positioned in the road between the second speed reducer and the third speed reducer. According to the invention, through arranging the first speed reducing device, the second speed reducing device and the third speed reducing device, the control cabinet can control the whole device to be dormant when no vehicle passes through, so that the purpose of energy saving is achieved, when a vehicle passes through, the first speed reducing device can be pressed, the microswitch is pressed to be closed, so that the whole device is activated, and in cooperation with the pressure sensor in the second speed reducing device, the weight of the vehicle can be detected, so that the control cabinet can judge the vehicle type, control the detection power of the annular detection coil, and improve the detection accuracy.

Description

Radio frequency detection method and device for vehicle traffic monitoring

Technical Field

The invention relates to the technical field of vehicle traffic monitoring. In particular to a radio frequency detection method and a device for vehicle traffic monitoring.

Background

The majority of toll roads in China adopt closed management, a driver obtains a pass card at a road entrance, the pass card records the type, time, direction, entrance toll information and the like of vehicles, and corresponding toll collection is carried out at an exit according to the recorded information in the pass card;

because a charging system has certain defects, illegal persons use the loopholes to carry out card reversing operation, so that a plurality of pass cards are obtained, and operations such as fee evasion and the like are realized, the conventional automatic card sender realizes automatic card distribution by a vehicle passing detection device matched with the conventional automatic card sender, but the conventional detection device can only detect whether the vehicle passes or not and cannot detect the driving direction of the vehicle, and a lawless person drives the vehicle to back up after passing through a detection coil, so that the system makes a wrong judgment, or a coil makes a wrong judgment by using an iron plate and the like, so that the card sender sends cards for a plurality of times; and the detection power of the existing detection coil cannot be adjusted according to the vehicle, so that the condition of false detection is increased.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to provide a radio frequency detection method and a radio frequency detection device for monitoring vehicle passing, which can detect the reversing of a vehicle and can adjust the coil detection power.

In order to solve the technical problems, the invention provides the following technical scheme: the radio frequency detection method for vehicle traffic monitoring comprises the following steps:

step A: when the vehicle moves forwards, firstly pressing the first speed reducer to activate the whole device, then continuously moving forwards to press the second speed reducer, detecting the pressure applied by the second speed reducer, and feeding back the pressure value to the control cabinet; the control cabinet judges a pressure value and compares the pressure value with a set value, when the pressure value is smaller than the set value, the control cabinet does not act, when the pressure value is larger than the set value, the control cabinet adjusts the detection power of the annular detection coil according to the magnitude of the pressure value, and meanwhile, the distance measurement module monitors the real-time distance between the vehicle and the electric barrier machine; the control cabinet judges the running state of the vehicle according to the detection of the distance of the vehicle and the annular detection coil, when the vehicle runs abnormally, the control cabinet closes the annular detection coil and gives an alarm, the vehicle runs normally, the third speed reducer is pressed forward continuously, the control cabinet controls the annular detection coil to be dormant, data are synchronized to the automatic card sender, then the electric barrier machine is controlled to be released, and after the vehicle passes through, the electric barrier machine is controlled to be reset and the whole device is controlled to be dormant; starting a control cabinet, wherein the control cabinet controls each component to stand by;

and B: when the vehicle runs to the current road section, the tire of the vehicle firstly presses the first speed reducing device, the first speed reducing device moves downwards, the microswitch in the first speed reducing device is pressed to be closed, and the control cabinet starts the whole detection device after detecting that the microswitch of the first speed reducing device is closed;

and C: after a tire of a vehicle presses a first speed reducer, the tire continuously moves forwards to press a second speed reducer, the second speed reducer moves downwards under the weight of the vehicle and applies pressure to a pressure sensor, the pressure sensor detects the pressure and feeds back current vehicle weight information to a control cabinet, the control cabinet adjusts the detection power of an annular detection coil according to the weight of the vehicle, and after the vehicle passes through the annular detection coil, the control cabinet judges whether the vehicle normally moves forwards;

step D: when the vehicle passes through the annular detection coil, the vehicle continues to move forwards, the tire of the vehicle presses the third speed reducing device and presses a microswitch in the third speed reducing device, the control cabinet judges that the vehicle normally moves forwards and controls the annular detection coil to sleep;

step E: the distance measuring module detects the distance between the vehicle head and the electric barrier machine, when the distance between the vehicle head and the electric barrier machine is continuously reduced, the control cabinet judges that the vehicle normally moves forwards, otherwise, the running state of the vehicle is abnormal; when the vehicle normally gos forward, after the locomotive is in the settlement distance apart from electric barrier machine, the electronic barrier machine of switch board control is opened, releases the vehicle, and after the vehicle released, the electronic barrier machine of switch board control resets and controls each subassembly dormancy.

Radio frequency detection device is used in current monitoring of vehicle, including first decelerator, second decelerator, third decelerator, annular detection coil, electronic railing machine, switch board and ranging module, first decelerator, second decelerator and third decelerator set gradually on the road surface, annular detection coil is located the road between second decelerator and the third decelerator, switch board and electronic railing machine are located the road both sides respectively, ranging module sets up at the railing middle part of electronic railing machine to the first decelerator direction of level orientation.

The radio frequency detection device for vehicle passage monitoring comprises a first bottom frame, wherein a first cambered panel is arranged inside the first bottom frame, first sliding blocks are arranged at two ends of the first cambered panel, a first sliding groove is formed in the side surface of the inner wall of the first bottom frame, the first sliding blocks are positioned in the first sliding groove, and a first rubber sleeve is arranged on the surface of each first sliding block; the bottom fixedly connected with telescopic link of first cambered plate, the other end of telescopic link and the inner wall bottom fixed connection of first underframe, the inner wall bottom of first underframe is provided with micro-gap switch, micro-gap switch's top and the bottom fixed connection of first cambered plate.

The radio frequency detection device for vehicle passage monitoring comprises a second bottom frame, wherein a second cambered panel is arranged inside the second bottom frame, second sliding blocks are arranged at two ends of the second cambered panel, a second sliding groove is formed in the side surface of the inner wall of the second bottom frame, the second sliding blocks are positioned in the second sliding grooves, and a second rubber sleeve is arranged on the surface of each second sliding block; the bottom fixedly connected with of second cambered plate is another telescopic link, another the inner wall bottom fixed connection of the other end of telescopic link and second underframe, the inside bottom of second underframe is provided with pressure sensor, pressure sensor's top and the bottom fixed connection of second cambered plate.

According to the radio frequency detection device for vehicle passing monitoring, the number of the microswitches is three, the three microswitches are uniformly distributed at the bottom of the first arc panel, and the three microswitches are respectively and electrically connected with the control cabinet.

Above-mentioned radio frequency detection device for vehicle current monitoring, the micro-gap switch of first decelerator and third decelerator and the pressure sensor of second decelerator respectively with switch board electric connection, the switch board passes through wire and annular detection coil, electronic barrier machine and ranging module electric connection.

In the radio frequency detection device for vehicle passage monitoring, a distance between the first reduction gear and the second reduction gear is smaller than a distance between the second reduction gear and the third reduction gear, and the distance between the first reduction gear and the second reduction gear is equal to the width of the first cambered plate.

The technical scheme of the invention achieves the following beneficial technical effects:

1. by arranging the first speed reducing device, the second speed reducing device and the third speed reducing device, the control cabinet can control the whole device to sleep when no vehicle passes through, thereby achieving the purpose of energy saving, when a vehicle passes by, the first speed reducing device can be pressed, the microswitch is pressed to be closed, thereby activating the whole device, being matched with a pressure sensor in the second speed reducing device, being capable of detecting the weight of the vehicle, leading the control cabinet to judge the vehicle type, the detection power of the annular detection coil is controlled, different vehicle types have different chassis heights, the chassis is correspondingly increased when the vehicle is bigger, when the power of the annular detection coil is constant, the chassis height of the vehicle is possibly higher, and the detection power of the annular detection coil is insufficient, detection omission and false detection occur, and when the detection power is correspondingly adjusted according to the weight of the vehicle, the detection accuracy can be improved.

2. According to the invention, through arranging the first speed reducing device and matching with the second speed reducing device, when the vehicle runs normally, the wheel can firstly press the first speed reducing device and then press the second speed reducing device, when the vehicle runs backwards, the sequence data of the data detected by the first speed reducing device and the second speed reducing device are opposite, so that the abnormal running direction of the vehicle is preliminarily judged, and the distance between the vehicle and the electric barrier machine can be accurately judged by matching with the distance measuring module, so that the running direction of the vehicle is judged, and the accuracy of judging the running direction of the vehicle is improved by combining the two judgment information.

3. According to the invention, by arranging the third detection device, the detection coil can be controlled to sleep through the control cabinet after the first shaft of the vehicle passes through, so that the detection coil is prevented from being judged by a driver by means of reversing and the like, and the automatic card sender can be prevented from issuing cards for many times due to system misjudgment.

Drawings

FIG. 1 is a schematic top view of the present invention;

FIG. 2 is a schematic cross-sectional view of a first reduction gear of the present invention;

FIG. 3 is a schematic cross-sectional view of a second reduction gear according to the present invention;

FIG. 4 is a schematic view of the detection process of the present invention

The reference numbers in the figures denote: 1-an annular detection coil; 2-a first reduction gear; 3-a second reduction gear; 4-third reduction gear; 5-electric railing machine; 6-a ranging module; 7-a control cabinet; 8-a first cambered plate; 9-a first bottom frame; 10-a first rubber sleeve; 11-a first slider; 12-a first runner; 13-a microswitch; 14-a telescopic rod; 15-a second cambered plate; 16-a second bottom frame; 17-a pressure sensor; 18-a second slide; 19-a second runner; and 20-a second rubber sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: the radio frequency detection method for vehicle traffic monitoring comprises the following steps:

step A: when the vehicle moves forwards, firstly pressing the first speed reducer 2 to activate the whole device, then continuously moving forwards to press the second speed reducer 3, detecting the pressure applied by the second speed reducer 3, and feeding back the pressure value to the control cabinet 7; the control cabinet 7 judges a pressure value and compares the pressure value with a set value, when the pressure value is smaller than the set value, the control cabinet 7 does not act, when the pressure value is larger than the set value, the control cabinet 7 adjusts the detection power of the annular detection coil 1 according to the magnitude of the pressure value, and meanwhile, the distance measurement module 6 monitors the real-time distance between the vehicle and the electric barrier machine 5; the control cabinet 7 judges the running state of the vehicle according to the detection of the distance of the vehicle and the annular detection coil 1, when the vehicle runs abnormally, the control cabinet 7 closes the annular detection coil 1 and gives an alarm, the vehicle runs normally, the third speed reducer 4 is pressed forward continuously, the control cabinet 7 controls the annular detection coil 1 to sleep, data are synchronized to the automatic card sender, then the electric barrier machine 5 is controlled to release, and after the vehicle passes through, the electric barrier machine 5 is controlled to reset and the whole device is controlled to sleep; starting the control cabinet 7, and controlling each component to stand by the control cabinet 7;

and B: when the vehicle runs to the current road section, the tire of the vehicle firstly presses the first speed reducing device 2, the first speed reducing device 2 moves downwards, the microswitch 13 in the first speed reducing device 2 is pressed to be closed, and the control cabinet 7 starts the whole detection device after detecting that the microswitch 13 of the first speed reducing device 2 is closed;

and C: after a tire of a vehicle presses the first speed reducer 2, the tire continuously moves forward to press the second speed reducer 3, the second speed reducer 3 moves downwards under the weight of the vehicle and applies pressure to the pressure sensor 17, the pressure sensor detects the pressure and feeds back current vehicle weight information to the control cabinet 7, the control cabinet 7 adjusts the detection power of the annular detection coil 1 according to the weight of the vehicle, and after the vehicle passes through the annular detection coil 1, the control cabinet 7 judges whether the vehicle normally moves forward;

step D: when the vehicle passes through the annular detection coil 1, the vehicle continues to move forwards, the tire of the vehicle presses the third speed reducing device 4 and presses the microswitch 13 in the third speed reducing device 4, the control cabinet 7 judges that the vehicle normally moves forwards and controls the annular detection coil 1 to sleep;

step E: the distance measuring module 6 detects the distance between the vehicle head and the electric barrier machine 5, when the distance between the vehicle head and the electric barrier machine 5 is continuously reduced, the control cabinet 7 judges that the vehicle normally moves forwards, otherwise, the running state of the vehicle is abnormal; when the vehicle normally gos forward, after the locomotive is at the settlement distance apart from electronic barrier machine 5, switch board 7 control electronic barrier machine 5 is opened, lets go to the vehicle, and after the vehicle was let go, switch board 7 control electronic barrier machine 5 reset and control each subassembly dormancy.

As shown in fig. 1 to 3, the radio frequency detection device for vehicle passage monitoring of the present embodiment includes a first speed reduction device 2, a second speed reduction device 3, a third speed reduction device 4, an annular detection coil 1, an electric barrier machine 5, a control cabinet 7 and a distance measurement module 6, wherein the first speed reduction device 2, the second speed reduction device 3 and the third speed reduction device 4 are sequentially disposed on the surface of a road, the annular detection coil 1 is located in the road between the second speed reduction device 3 and the third speed reduction device 4, the distance between the first speed reduction device 2 and the second speed reduction device 3 is smaller than the distance between the second speed reduction device 3 and the third speed reduction device 4, the distance between the first speed reduction device 2 and the second speed reduction device 3 is equal to the width of a first arc panel 8, the control cabinet 7 and the electric barrier machine 5 are respectively located on both sides of the road, and a microswitch 13 of the first speed reduction device 2 and the third speed reduction device 4 and a pressure sensor 17 of the second speed reduction device 3 are respectively located on both sides of the road 7, the control cabinet 7 is electrically connected with the annular detection coil 1, the electric barrier machine 5 and the distance measuring module 6 through a lead, the control cabinet 7 can control the whole device to sleep when no vehicle passes through by arranging the first speed reducing device 2, the second speed reducing device 3 and the third speed reducing device 4, so that the energy-saving purpose is achieved, when a vehicle passes through, the first speed reducing device 2 can be pressed, the microswitch 13 is pressed to be closed, so that the whole device is activated, the weight of the vehicle can be detected by matching with the pressure sensor 17 in the second speed reducing device 3, the control cabinet 7 can judge the vehicle type and control the detection power of the annular detection coil 1, the problems that the annular detection coil 1 is missed and mistakenly detected due to different vehicle types and different chassis heights are avoided, the detection accuracy is improved, and by arranging the third detection device, after the first shaft of the vehicle passes through, can pass through switch board 7 control detection coil dormancy to avoid the driver to utilize means such as backing a car to make detection coil erroneous judgement, avoid the system erroneous judgement to lead to automatic card sender to send a card many times, ranging module 6 sets up in the railing middle part of electronic barrier machine 5, and the level is towards first decelerator 2 directions.

As shown in fig. 2, the first speed reducer 2 and the third speed reducer 4 have the same structure, the first speed reducer 2 includes a first bottom frame 9, a first cambered plate 8 is disposed inside the first bottom frame 9, first sliders 11 are disposed at two ends of the first cambered plate 8, a first chute 12 is disposed on a side surface of an inner wall of the first bottom frame 9, the first slider 11 is disposed in the first chute 12, and a first rubber sleeve 10 is disposed on a surface of the first slider 11; the bottom of the first cambered plate 8 is fixedly connected with an expansion link 14, the other end of the expansion link 14 is fixedly connected with the bottom of the inner wall of the first bottom frame 9, a microswitch 13 is arranged at the bottom of the inner wall of the first bottom frame 9, the top end of the microswitch 13 is fixedly connected with the bottom of the first cambered plate 8, the number of the micro switches 13 is three, the three micro switches 13 are uniformly distributed at the bottom of the first arc-shaped panel 8, the three micro switches 13 are respectively electrically connected with the control cabinet 7, as shown in fig. 3, the second speed reducer 3 includes a second bottom frame 16, a second cambered plate 15 is disposed inside the second bottom frame 16, two ends of the second cambered plate 15 are respectively provided with a second sliding block 18, the side surface of the inner wall of the second bottom frame 16 is provided with a second sliding groove 19, the second sliding block 18 is positioned in the second sliding groove 19, and a second rubber sleeve 20 is arranged on the surface of the second sliding block 18; the bottom of the second cambered plate 15 is fixedly connected with another telescopic rod 14, the other end of the other telescopic rod 14 is fixedly connected with the bottom of the inner wall of the second bottom frame 16, the bottom inside the second bottom frame 16 is provided with a pressure sensor 17, the top of the pressure sensor 17 is fixedly connected with the bottom of the second cambered plate 15, through the arrangement of the first speed reducer 2 and the cooperation with the second speed reducer 3, when the vehicle normally runs, the wheels firstly press the first speed reducer 2 and then press the second speed reducer 3, when the vehicle runs backwards, the data sequence of the data detected by the first speed reducer 2 and the second speed reducer 3 is opposite, so that the abnormal running direction of the vehicle is preliminarily judged, and the distance between the vehicle and the electric barrier machine 5 can be accurately judged by the cooperation with the distance measuring module 6, so that the running direction of the vehicle is judged, and through the combination of the two judgment information, the accuracy of judging the driving direction of the vehicle is improved.

The working principle is as follows: when a vehicle normally moves forward, a first axle tire of the vehicle firstly presses the first speed reducing device 2, the first speed reducing device 2 is subjected to pressure reduction, so that the microswitch 13 is triggered, the control cabinet 7 judges that the vehicle passes after detecting that the microswitch 13 is closed, the whole device is started, when the vehicle continuously moves forward, the tire presses the second speed reducing device 3, the pressure sensor 17 in the second speed reducing device 3 is subjected to pressure, pressure data are transmitted to the control cabinet 7, when the pressure data are smaller than the minimum preset value, the control cabinet 7 does not operate the next step, the manual stepping is avoided, the detection is triggered, the control cabinet 7 controls the annular detection coil 1 to operate at different detection powers according to the received pressure data, the larger the pressure is, the larger the vehicle type of the vehicle is, the corresponding chassis is higher, and the false detection and the missing detection can be reduced by matched power detection; when a vehicle passes through the annular detection coil 1, the control cabinet 7 judges that the vehicle passes above a road and controls the distance measurement module 6 to measure the real-time distance between the vehicle and a railing, after a first shaft tire of the vehicle presses the third speed reducer 4, the microswitch 13 in the third speed reducer 4 is closed, the control cabinet 7 controls the annular detection coil 1 to sleep, so that illegal operations such as backing up the vehicle by a driver are avoided, after the vehicle approaches the electric barrier machine 5, the control cabinet 7 controls the electric barrier machine 5 to lift the rod and synchronize information to the automatic card sender to send the card and release the vehicle, then the control cabinet 7 controls the annular detection coil 1 to start, whether the vehicle is above the detection, at the moment, the coil only detects the vehicle, does not synchronize information with the automatic card sender after detecting the vehicle above, and controls the electric barrier machine 5 to drop the rod after no vehicle exists.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.

Claims (7)

1. The radio frequency detection method for vehicle traffic monitoring is characterized by comprising the following steps:

step A: when the vehicle moves forwards, firstly pressing the first speed reducing device (2) to activate the whole device, then continuously moving forwards to press the second speed reducing device (3), detecting the pressure applied by the second speed reducing device (3), and feeding back the pressure value to the control cabinet (7); the control cabinet (7) judges the pressure value and compares the pressure value with a set value, when the pressure value is smaller than the set value, the control cabinet (7) does not act, when the pressure value is larger than the set value, the control cabinet (7) adjusts the detection power of the annular detection coil (1) according to the size of the pressure value, and meanwhile, the distance measurement module (6) monitors the real-time distance between the vehicle and the electric barrier machine (5); the control cabinet (7) judges the running state of the vehicle according to the distance between the vehicle and the detection of the annular detection coil (1), when the vehicle runs abnormally, the control cabinet (7) closes the annular detection coil (1) and gives an alarm, the vehicle runs normally, the third speed reducing device (4) is pressed forward continuously, the control cabinet (7) controls the annular detection coil (1) to sleep, data are synchronized to the automatic card sender, then the electric barrier machine (5) is controlled to release, and after the vehicle passes through, the electric barrier machine (5) is controlled to reset and the whole device is controlled to sleep; starting a control cabinet (7), wherein the control cabinet (7) controls each component to stand by;

and B: when the vehicle runs to the current road section, the tire of the vehicle firstly presses the first speed reducing device (2), the first speed reducing device (2) moves downwards, a microswitch (13) in the first speed reducing device (2) is pressed to be closed, and the control cabinet (7) starts the whole detection device after detecting that the microswitch (13) of the first speed reducing device (2) is closed;

and C: the tire of vehicle is after pressing first decelerator (2), and the continuous advancing pressure moves second decelerator (3), and second decelerator (3) receive the weight of vehicle and move downwards to exert pressure to pressure sensor (17), and pressure sensor detects the pressure that receives, and feedback current vehicle weight information to switch board (7), and switch board (7) are according to the weight adjustment annular detection coil's of vehicle detection power (1), and the vehicle is through annular detection coil (1) back, and switch board (7) judge whether the vehicle normally advances:

step D: when the vehicle passes through the annular detection coil (1), the vehicle continues to move forwards, the tire of the vehicle presses the third speed reducing device (4) and presses the microswitch (13) in the third speed reducing device (4), the control cabinet (7) judges that the vehicle normally moves forwards and controls the annular detection coil (1) to sleep;

step E: the distance measuring module (6) detects the distance between the vehicle head and the electric barrier machine (5), when the distance between the vehicle head and the electric barrier machine (5) is continuously reduced, the control cabinet (7) judges that the vehicle normally moves forwards, otherwise, the running state of the vehicle is abnormal; when the vehicle normally advances, after the vehicle head is at a set distance from the electric barrier machine (5), the control cabinet (7) controls the electric barrier machine (5) to be opened, the vehicle is released, and after the vehicle is released, the control cabinet (7) controls the electric barrier machine (5) to reset and control each component to sleep.

2. The radio frequency detection device for vehicle traffic monitoring comprises a first speed reducer (2), a second speed reducer (3), a third speed reducer (4), an annular detection coil (1), an electric barrier machine (5), a control cabinet (7) and a distance measurement module (6), and is characterized in that the first speed reducer (2), the second speed reducer (3) and the third speed reducer (4) are sequentially arranged on the surface of a road according to the normal running direction of a vehicle, the annular detection coil (1) is positioned in the road between the second speed reducer (3) and the third speed reducer (4), the control cabinet (7) and the electric barrier machine (5) are respectively positioned on two sides of the road, and the distance measurement module (6) is arranged in the middle of a barrier of the electric barrier machine (5) and horizontally faces the direction of the first speed reducer (2); and the railing of the electric railing machine (5) is positioned right ahead of the third speed reducing device (4).

3. The vehicle passage monitoring radio frequency detection device according to claim 2, wherein the first reduction gear (2) and the third reduction gear (4) have the same structure, the first reduction gear (2) includes a first bottom frame (9), a first cambered plate (8) is disposed inside the first bottom frame (9), first sliding blocks (11) are disposed at both ends of the first cambered plate (8), a first sliding groove (12) is formed in a side surface of an inner wall of the first bottom frame (9), the first sliding blocks (11) are located in the first sliding grooves (12), and a first rubber sleeve (10) is disposed on a surface of the first sliding blocks (11); the bottom fixedly connected with telescopic link (14) of first cambered plate (8), the other end of telescopic link (14) and the inner wall bottom fixed connection of first underframe (9), the inner wall bottom of first underframe (9) is provided with micro-gap switch (13), the top of micro-gap switch (13) and the bottom fixed connection of first cambered plate (8).

4. The vehicle passage monitoring radio frequency detection device according to claim 2, wherein the second speed reduction device (3) comprises a second bottom frame (16), a second cambered plate (15) is arranged inside the second bottom frame (16), second sliding blocks (18) are arranged at two ends of the second cambered plate (15), a second sliding groove (19) is formed in the side surface of the inner wall of the second bottom frame (16), the second sliding blocks (18) are located in the second sliding groove (19), and a second rubber sleeve (20) is arranged on the surface of each second sliding block (18); the bottom fixedly connected with of second cambered plate (15) is another telescopic link (14), another the inner wall bottom fixed connection of the other end and the second underframe (16) of telescopic link (14), the inside bottom of second underframe (16) is provided with pressure sensor (17), the top of pressure sensor (17) and the bottom fixed connection of second cambered plate (15).

5. The radio frequency detection device for vehicle passing monitoring as claimed in claim 3, wherein the number of the micro switches (13) is three, three micro switches (13) are distributed at equal intervals at the bottom of the first cambered plate (8) along the direction perpendicular to the normal running direction of the vehicle, and the three micro switches (13) are respectively electrically connected with the control cabinet (7).

6. The radio frequency detection device for vehicle passing monitoring according to claim 2, wherein the micro-switches (13) of the first reduction gear (2) and the third reduction gear (4) and the pressure sensors (17) of the second reduction gear (3) are respectively electrically connected with the control cabinet (7), and the control cabinet (7) is electrically connected with the annular detection coil (1), the electric barrier machine (5) and the distance measuring module (6) through conducting wires.

7. The radio frequency detection device for vehicle passage monitoring according to claim 2, wherein a distance between the first reduction gear (2) and the second reduction gear (3) is smaller than a distance between the second reduction gear (3) and the third reduction gear (4), and the distance between the first reduction gear (2) and the second reduction gear (3) is larger than a maximum width of contact between the wheel and the ground in a normal running direction of the vehicle.

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