An intelligent access control system based on the Internet of Things

Abstract

The present invention relates to the field of intelligent access control technology, and in particular to an intelligent access control system based on the Internet of Things. The control system also includes a vehicle deviation detection mechanism arranged in the middle of an entry path, a slide groove is provided on a cross bar, a slide rod is slidably connected to the inner side of the slide groove, a turntable is fixedly connected to the front end of the slide rod, a rotating wheel is rotatably connected to the inner side of the bottom end of the turntable, the outer side of the rotating wheel is in the shape of a toothed ring, and the center of the bottom end of the rotating wheel is fixedly connected to the top of a camera. The camera can be displaced and deflected according to the deviation data provided by the vehicle deviation detection mechanism to be in an optimal recognition position. The present invention installs a camera on the cross bar, and the camera can be moved and deflected. After the position and deflection of the vehicle deviation detection mechanism, the arranged camera can be adjusted and deflected, so that the camera and the license plate of the vehicle are at an angle that is easy to identify, thereby reducing the phenomenon of blockage at the access control.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent access control and management, and in particular to an intelligent access control and management system based on the Internet of Things. Background Art

[0002] At present, the company's current access control system automatically enters the queuing system after being activated by the car dispatch service. After the number is called, the driver receives the entry notification information through the WeChat client on his mobile phone. When the vehicle passes through the access control, the barrier is automatically lifted to enter the factory if the business validity, the entry time limit called and the environmental protection emission standards are met.

[0003] However, there are currently the following situations: first, in some cases, a manual remote control is required to operate the lifting pole, which will result in poor supervision and some artificial loopholes;

[0004] Second, in certain constrained scenarios, such as sufficient and uniform lighting, simple background, fixed shooting angle, etc., the existing license plate recognition system can achieve a high license plate recognition accuracy rate, but in non-constrained scenarios such as uneven lighting, large angle deflection, rainy and snowy weather, the system has great limitations, which will cause the vehicle management system to recognize vehicles slowly, and there are cases where vehicles cannot be recognized, affecting the efficiency of vehicle traffic;

[0005] There are great differences in the vehicles entering the factory, including cars, buses and various trucks. The entrance channel is often wide, and the camera 4 will face more non-constrained scenes, such as Figure 1 and Figure 2 As shown, the camera 4 in the existing license plate recognition system is located on one side of the access control passage, and the camera 4 faces the middle position of the access control passage. When the walking trajectory 5 of the vehicle 8 has a large deflection, there will be a large deviation angle between the camera 4 and the license plate position of the vehicle 8, which may easily lead to recognition failure and affect the efficiency of vehicle passage.

[0006] Therefore, in response to the above problems, an intelligent access control system based on the Internet of Things is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide an intelligent access control system based on the Internet of Things to solve the problem raised in the above background technology that "in some cases, manual remote control is required to operate the lifting barrier, which will result in inadequate supervision, and thus there will be some human loopholes. In addition, the system has great limitations in non-constrained scenarios such as uneven lighting, large-angle deflection, rainy and snowy weather, which will cause the vehicle management system to recognize vehicles slowly, and there are cases where vehicles cannot be recognized, affecting the vehicle traffic efficiency."

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent access control system based on the Internet of Things, comprising a background server, a security booth with an alarm on the top, a gate lifter, a camera and a support seat, the output end of the gate lifter is rotatably connected to a crossbar, and data transmission is achieved between the gate lifter and the background server through a wireless network. The control system also includes a vehicle deviation detection mechanism arranged in the middle of the entry path;

[0009] A slide groove is provided on the cross bar, and a slide rod is slidably connected to the inner side of the slide groove, a turntable is fixedly connected to the front end of the slide rod, a rotating wheel is rotatably connected to the inner side of the bottom end of the turntable, and the outer side of the rotating wheel is in the shape of a toothed ring, and the center of the bottom end of the rotating wheel is fixedly connected to the top end of the camera, and the camera can be displaced and deflected according to the offset data provided by the vehicle offset detection mechanism to be in the optimal recognition position, and a tilt sensor for detecting the tilt state of the cross bar is provided on the cross bar;

[0010] The inner side of the turntable is rotatably connected to a gear ring, the inner side of the turntable is fixedly connected to a first motor, an output end of the first motor is fixedly connected to a gear, the gear is meshed with the gear ring, the outer side of the gear ring is meshed with the outer side of the rotating wheel, and the deflection of the camera angle is achieved by the first motor.

[0011] Under the above settings, the working mode of the factory vehicle access control in the present invention is that after the driver receives the factory entry notification information through the WeChat client on his mobile phone, he starts to enter the factory, and the camera identifies the vehicle information. When the vehicle information is consistent with the information pre-stored in the background server, and the business validity, the factory entry time limit and the environmental emission standards are met, the barrier is automatically lifted to enter the factory;

[0012] In order to prevent the camera from having a large angle with the vehicle license plate when the vehicle enters the factory after a large angle deflection in a non-constrained scenario, and the camera is prone to recognition errors or failure to recognize the vehicle, the present invention installs the camera on the crossbar. In the initial state, the camera is in the center of the crossbar to obtain a better recognition angle. The camera can be moved and deflected. After the position and deflection of the vehicle deviation detection mechanism, the camera can be adjusted and deflected, so that the camera and the vehicle license plate are at an angle that is easy to recognize, thereby increasing the recognition efficiency of the camera and reducing the phenomenon of blockage at the access control.

[0013] In the present invention, the camera angle is deflected in the following manner: the first motor rotates and drives the gear to rotate, the rotation of the gear causes the rotating wheel to deflect through the gear ring, and the rotating wheel synchronously drives the camera to deflect, thereby achieving the vertical or nearly vertical camera recognition angle and the vehicle license plate surface, and achieving effective recognition;

[0014] Preferably, a second motor is fixedly connected to the inner side of the cross bar, a first screw is fixedly connected to the end of the main shaft of the second motor, the first screw is rotatably set in the slide groove, the outer side of the first screw is spirally connected to the inner side of the slide bar, and the camera position is changed by the rotation of the second motor.

[0015] Under the above settings, the camera position is moved in such a way that the second motor rotates, the second motor rotates to drive the first screw to rotate, the rotation of the first screw drives the turntable and the camera to change position through the slide bar, and the rotation connection between the slide bar and the turntable makes it easy for the camera to be perpendicular to the ground;

[0016] Preferably, the vehicle deviation detection mechanism includes a first base, the upper surface of which is slidably connected to two symmetrical slides, the slides protrude from the road surface, and the two slides gradually rise toward both sides of the road, the bottom end of the first base is fixedly connected to a first telescopic rod, the bottom end of the slide is fixedly connected to a pressure rod, and the top movable end of the first telescopic rod is fixedly connected to the bottom end of the slide.

[0017] The first telescopic rod and the second telescopic rod in the present invention are elastic supporting members, and there is a return spring inside, which is the prior art and will not be elaborated here;

[0018] Preferably, each side of the first base is also fixedly connected to a fixed rod, a second telescopic rod, two fixed pulleys and a slide cylinder, and the top movable end of the second telescopic rod is rotatably connected to a movable pulley, and when the pressure rod moves downward, the top movable end of the second telescopic rod can be pressed down.

[0019] Preferably, a piston is slidably connected to the inner side of the slide, a tension sensor is fixedly connected to the inner side of one end of the slide, a tension spring is arranged on the inner side of the slide, and both ends of the tension spring are respectively fixedly connected to one end of the tension sensor and one end of the piston. In the initial state, the piston is in the middle position of the slide, and at this time, the tension spring is not subjected to force.

[0020] Preferably, a pull rope is fixedly connected to the outer side of the fixed rod, and the pull rope is successively wound around a movable pulley and two fixed pulleys and then fixedly connected to the other end of the piston, and the displacement distance of the piston is obtained through a tension sensor.

[0021] Preferably, one of the fixed pulleys is flush with the fixed rod, and the movable pulley is arranged between the fixed rod and the fixed pulley flush with the fixed rod.

[0022] Under the above settings, the present invention is provided with a vehicle deviation detection mechanism, which can roughly identify the center position and deflection angle of the vehicle on the road, and the subsequent camera will be displaced and deflected according to the data obtained by the vehicle deviation detection mechanism, so as to achieve more accurate and efficient recognition;

[0023] The detection method of the vehicle deviation detection mechanism is as follows: when the vehicle enters the factory, if the front wheels of the vehicle pass through two slide plates at the same time or nearly at the same time, the system determines that the vehicle has not deviated. At this time, the vehicle deviation detection mechanism can be used to identify whether the vehicle is in the center position. When the vehicle is not in the center position on the path, the camera can be moved to one side so that the camera's recognition angle is closer to the vehicle's license plate, achieving efficient and effective recognition;

[0024] The vehicle deviation detection mechanism identifies whether the vehicle is in the center position in the following manner: when the vehicle is not in the center position on the path, when the two front wheels pass through the two skateboards, the contact positions of the two front wheels and the two skateboards will be different, because the upper side of the skateboard is inclined and protrudes from the road surface. At this time, the sinking degree of the two skateboards will be different. By analyzing the sinking degree of the two skateboards, the offset position of the vehicle on the road can be obtained, wherein the sinking of the skateboard will act on the movable pulley through the pressure rod, and the descent of the movable pulley will pull the piston to the side away from the tension sensor through the pull rope, and the tension sensor is stressed. The force value of the tension sensor can directly reflect the sinking depth of the skateboard, thereby reflecting the position of the wheel on this side on the skateboard. After obtaining the positions of the two wheels on the two skateboards respectively, the offset value of the vehicle on the road can be obtained, so that the camera is moved according to the offset position so that the camera faces the license plate of the vehicle directly, thereby achieving more efficient recognition;

[0025] The purpose of the present invention to arrange the movable pulley between the fixed rod and the fixed pulley flush with the fixed rod is that, because the height difference between the left and right sides of the slide plate is small, when the movable pulley descends, the pull ropes on both sides of the movable pulley can be pulled. Under this arrangement, the descending distance of the movable pulley converted into the stretching distance of the pull rope will be increased, thereby increasing the sensitivity of the piston movement and the sensitivity of the force sensor to recognize the force.

[0026] The vehicle deviation detection mechanism identifies whether the vehicle is deflected in the following way: when the vehicle deflects when entering the factory, there will be a time difference when the two front wheels pass through the two slides respectively, that is, there will be a difference in the value changes of the two tension sensors. When the vehicle first passes through one slide, the vehicle will tilt in the direction of the other slide. Therefore, the deflection angle of the vehicle when entering the factory can be determined, and the camera can be rotated according to the deflection direction so that the camera is relatively facing the license plate of the vehicle, achieving more efficient recognition;

[0027] When the vehicle deviates into the factory and is not centered on the path, the slide plate of the present invention can also be used for identification by referring to the above two methods, and the camera can change the position and shift the angle at the same time;

[0028] Preferably, the management and control system also includes a second base, the top end of the second base is rotatably connected to an inclined plate via a hinge, and after the inclined plate falls, it can remain flush with the ground, and the inner side of the second base is fixedly connected to a support plate, the top end of the support plate is rotatably connected to an electric push rod via a hinge, and the top end of the electric push rod is rotatably connected to the bottom end of the inclined plate via a hinge, and the lifting and lowering movement of one side of the opening of the inclined plate is achieved by the extension and retraction of the movable end of the electric push rod.

[0029] Preferably, two connecting plates are fixedly connected to the bottom end of the inclined plate, a second screw is rotatably connected between the two connecting plates, a limiting rod is fixedly connected between the two connecting plates, a slider is slidably connected to the outer side of the limiting rod, the inner side of the slider is spirally connected to the outer side of the second screw, a third motor is fixedly connected to one of the connecting plates, the end of the main shaft of the third motor is fixedly connected to the second screw, a nozzle is fixedly connected to one end of the slider, and the position of the nozzle is adjusted by rotating the third motor.

[0030] Preferably, a water pump is fixedly connected to the bottom end of the second base, the input end of the water pump is connected to the water supply pipe, and the output end of the water pump is connected to the water inlet end of the nozzle through a hose.

[0031] Under the above settings, after adjusting the position and angle of the camera, if the camera still cannot achieve effective recognition, the access control system will determine that the vehicle's license plate is covered by dust, etc. The license plate is generally in the middle of the front bottom of the vehicle. At this time, the camera can obtain the position of the vehicle in the factory access channel through the vehicle offset detection mechanism, thereby changing the position of the nozzle. The horizontal movement of the nozzle is achieved by the third motor driving the second screw to make the nozzle face the vehicle's license plate. The water pump works, and the active end of the electric push rod continuously reciprocates, causing the tilting plate to open and close reciprocatingly, and the nozzle will spray water toward the vehicle's license plate to facilitate the camera to recognize the vehicle information.

[0032] When the camera still cannot recognize the vehicle information after the license plate is cleaned with water or the vehicle information does not match the information pre-stored in the backend server, the camera will take a snapshot of the vehicle and store it in the backend server and activate the alarm to increase the safety of the factory area;

[0033] When the staff in the security booth manually opens the crossbar, the camera in the present invention will also capture the vehicle and store it in the background server.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. This kind of intelligent access control system based on the Internet of Things, in order to prevent the vehicle from entering the factory after a large angle deflection in a non-constrained scenario, causing a large angle between the camera and the vehicle license plate, and the camera is prone to recognition errors and failure to recognize. The present invention installs the camera on a cross bar. In the initial state, the camera is in the center position of the cross bar to obtain a better recognition angle. The camera can move and deflect. After the position and deflection of the vehicle offset detection mechanism, the set camera can adjust the position and deflect, so that the camera and the vehicle license plate are at an angle that is easy to recognize, thereby increasing the recognition efficiency of the camera and reducing the phenomenon of blockage at the access control.

[0036] 2. This is an intelligent access control system based on the Internet of Things. A vehicle offset detection mechanism is provided in the present invention. The vehicle offset detection mechanism can roughly identify the center position and deflection angle of the vehicle on the road. The subsequent camera will move and deflect according to the data obtained by the vehicle offset detection mechanism, thereby achieving more accurate and efficient identification.

[0037] 3. In this intelligent access control system based on the Internet of Things, the detection method of the vehicle deviation detection mechanism is: when the vehicle enters the factory, if the front wheels of the vehicle pass through two slides at the same time or nearly at the same time, the system determines that the vehicle has not deflected. At this time, the vehicle deviation detection mechanism can be used to identify whether the vehicle is in the center position. When the vehicle is not in the center position on the path, the camera can be moved to the side so that the camera's recognition angle is closer to the vehicle's license plate, thereby achieving efficient and effective recognition.

[0038] 4. In the intelligent access control system based on the Internet of Things, the vehicle offset detection mechanism identifies whether the vehicle is in the center position in the following way: when the vehicle is not in the center position on the path, when the two front wheels pass through the two skateboards, the contact positions of the two front wheels and the two skateboards will be different, because the upper side of the skateboard is inclined and protrudes from the road surface. At this time, the degree of sinking of the two skateboards will be different. By analyzing the degree of sinking of the two skateboards, the offset position of the vehicle on the road can be obtained, wherein the sinking of the skateboard will act on the movable pulley through the pressure rod, and the descent of the movable pulley will pull the piston to the side away from the tension sensor through the pull rope. The tension sensor is stressed, and the force value of the tension sensor can directly reflect the sinking depth of the skateboard, thereby reflecting the position of the wheel on this side on the skateboard. After obtaining the positions of the two wheels on the two skateboards respectively, the offset value of the vehicle on the road can be obtained, so that the camera is moved according to the offset position so that the camera faces the license plate of the vehicle directly, thereby achieving more efficient recognition.

[0039] 5. In the intelligent access control system based on the Internet of Things, the present invention sets the movable pulley between the fixed rod and the fixed pulley flush with the fixed rod. Because the height difference between the left and right sides of the skateboard is small, when the movable pulley descends, the pull ropes on both sides of the movable pulley can be pulled. Under this setting, the descending distance of the movable pulley converted into the stretching distance of the pull rope will be increased, thereby increasing the sensitivity of the piston movement and the sensitivity of the tension sensor to force recognition.

[0040] 6. In this intelligent access control system based on the Internet of Things, the vehicle deviation detection mechanism identifies whether the vehicle is in a deflection in the following way: when the vehicle is deflected when entering the factory, there will be a time difference when the two front wheels pass through the two skateboards respectively, that is, there will be a difference in the numerical changes of the two tension sensors. When the vehicle first passes through the skateboard on one side, the vehicle will tilt in the direction of the skateboard on the other side. Therefore, the deflection angle of the vehicle when entering the factory can be judged, and the camera can be rotated according to the deflection direction so that the camera faces the license plate of the vehicle relatively directly, thereby achieving more efficient recognition.

[0041] 7. In this intelligent access control system based on the Internet of Things, when a vehicle deviates to enter the factory and is not centered on the path, the skateboard in the present invention can also refer to the above two methods for identification, and make the camera change its position and shift its angle at the same time.

[0042] 8. This is an intelligent access control system based on the Internet of Things. After adjusting the position and angle of the camera, if the camera still cannot achieve effective recognition, the access control system will determine that the vehicle's license plate is covered by dust, etc. The license plate is generally in the middle of the front bottom of the vehicle. At this time, the camera can obtain the position of the vehicle in the factory access channel through the vehicle offset detection mechanism, thereby changing the position of the nozzle. The horizontal movement of the nozzle is achieved by the third motor driving the second screw, so that the nozzle faces the vehicle's license plate. The water pump works, and the active end of the electric push rod continuously reciprocates, causing the tilting plate to reciprocate up and down, and the nozzle will spray water toward the vehicle's license plate to clean it, so that the camera can recognize the vehicle information.

[0043] 9. This is an intelligent access control system based on the Internet of Things. When the camera still cannot recognize the vehicle information after the license plate is cleaned by spraying water or the vehicle information does not match the information pre-stored in the background server, the camera will capture the vehicle and store it in the background server and activate the alarm to increase the safety of the factory area. When the staff in the security booth manually opens the crossbar, the camera in the present invention will also capture the vehicle and store it in the background server. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the overall appearance structure of the existing access control system;

[0045] Figure 2 It is a top-down schematic diagram when a camera and a vehicle have a large deviation angle when an existing vehicle deflects and enters;

[0046] Figure 3 This is a schematic diagram of the overall appearance structure of the access control system of the present invention;

[0047] Figure 4 It is a top view schematic diagram of the angle between the camera and the vehicle when the vehicle deflects and enters the vehicle according to the present invention;

[0048] Figure 5 This is a schematic diagram of the appearance structure of the turntable of the present invention;

[0049] Figure 6 It is a schematic diagram of the cross-sectional installation structure inside the turntable of the present invention;

[0050] Figure 7 For the present invention Figure 6 Schematic diagram of the installation structure at A in FIG.

[0051] Figure 8 It is a schematic diagram of the installation structure inside the crossbar of the present invention;

[0052] Fig. 9 It is a schematic diagram of the installation structure inside the first base of the present invention;

[0053] Fig.10 For the present invention Fig. 9 Schematic diagram of the installation structure at B in FIG.

[0054] Fig.11 This is a schematic diagram of the appearance structure of the slide plate of the present invention;

[0055] Fig.12 It is a schematic diagram of the installation structure of the movable pulley from the side view of the present invention;

[0056] Fig.13 A further schematic diagram of the overall appearance structure of the access control system of the present invention;

[0057] Fig.14 It is a schematic diagram of the installation structure inside the second base of the present invention;

[0058] Fig.15 It is a schematic diagram of the appearance structure of the inclined plate of the present invention.

[0059] In the figure: 1, security booth; 2, back-end server; 3, gate lifter; 4, camera; 5, walking track; 6, support base; 7, crossbar; 8, vehicle; 9, rotating wheel; 10, turntable; 11, tilt sensor; 12, first base; 13, slide plate; 14, slide bar; 15, first screw rod; 16, first motor; 17, gear; 18, gear ring; 19, second motor; 20, first telescopic rod; 21, second telescopic rod; 22, pressure rod; 23, piston; 24, slide cylinder; 25, fixed pulley; 26, pull rope; 27, movable pulley; 28, fixed rod;

[0060] 29. Inclined plate; 30. Second base; 31. Support plate; 32. Water pump; 33. Nozzle; 34. Slider; 35. Electric push rod; 36. Connecting plate; 37. Second screw rod; 38. Limit rod; 39. Alarm; 40. Tension sensor; 41. Tension spring; 42. Third motor. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0062] Example 1

[0063] See also Figure 1-Figure 12 , the present invention provides a technical solution:

[0064] An intelligent access control system based on the Internet of Things, comprising a backend server 2, a security booth 1 with an alarm 39 on the top, a gate lifter 3, a camera 4 and a support base 6, wherein the output end of the gate lifter 3 is rotatably connected to a crossbar 7, and data transmission is achieved between the gate lifter 3 and the backend server 2 via a wireless network, and the control system further comprises a vehicle deviation detection mechanism arranged in the middle of the entry path;

[0065] A slide groove is provided on the cross bar 7, and a slide bar 14 is slidably connected to the inner side of the slide groove, and a turntable 10 is fixedly connected to the front end of the slide bar 14. A rotating wheel 9 is rotatably connected to the inner side of the bottom end of the rotating wheel 10, and the outer side of the rotating wheel 9 is in the shape of a toothed ring. The bottom center of the rotating wheel 9 is fixedly connected to the top of the camera 4. The camera 4 can be displaced and deflected according to the offset data provided by the vehicle offset detection mechanism to be in the optimal recognition position. A tilt sensor 11 for detecting the tilt state of the cross bar 7 is provided on the cross bar 7; after the tilt sensor 11 detects that the cross bar 7 is tilted, it means that the cross bar 7 is in the process of lifting the bar, because the camera 4 has the recognition capability as long as it faces forward. In order to ensure that the camera 4 effectively faces forward, during the process of lifting the cross bar 7, the second motor 19 will rotate to make the camera 4 near the rotation center of the cross bar 7, so as to facilitate vehicle recognition during the process of lifting the bar;

[0066] The inner side of the turntable 10 is rotatably connected to a gear ring 18, the inner side of the turntable 10 is fixedly connected to a first motor 16, the output end of the first motor 16 is fixedly connected to a gear 17, the gear 17 is meshed with the gear ring 18, the outer side of the gear ring 18 is meshed with the outer side of the rotating wheel 9, and the first motor 16 is used to realize the deflection of the angle of the camera 4.

[0067] Under the above settings, the working mode of the factory vehicle access control in the present invention is that after the driver receives the factory entry notification information through the WeChat client on his mobile phone, he starts to enter the factory, and the camera 4 identifies the information of the vehicle 8. When the information of the vehicle 8 is consistent with the information pre-stored in the background server 2, and the business validity, the time limit for calling the number to enter the factory, and the environmental protection emission standards are met, the barrier is automatically lifted to enter the factory;

[0068] In order to prevent the camera 4 from having a large angle with the license plate of the vehicle 8 when the vehicle 8 deflects at a large angle when entering the factory in a non-constrained scenario, and the camera 4 is prone to recognition errors or failure to recognize the vehicle 8, the present invention installs the camera 4 on the crossbar 7. In the initial state, the camera 4 is in the center of the crossbar 7 to obtain a better recognition angle. The camera 4 can be moved and deflected. After the position and deflection of the vehicle offset detection mechanism, the camera 4 can be adjusted and deflected, so that the camera 4 and the license plate of the vehicle 8 are at an angle that is easy to recognize, thereby increasing the recognition efficiency of the camera and reducing the phenomenon of blockage at the access control.

[0069] In the present invention, the deflection method of the camera 4 angle is as follows: the first motor 16 rotates and drives the gear 17 to rotate, the rotation of the gear 17 causes the rotating wheel 9 to deflect through the gear ring 18, and the rotating wheel 9 synchronously drives the camera 4 to deflect, thereby achieving the vertical or nearly vertical recognition angle of the camera 4 and the license plate surface of the vehicle 8, and achieving effective recognition;

[0070] Specifically, a second motor 19 is fixedly connected to the inner side of the cross bar 7, and a first screw 15 is fixedly connected to the end of the main shaft of the second motor 19. The first screw 15 is rotatably set in the slide groove, and the outer side of the first screw 15 is spirally connected to the inner side of the slide bar 14. The position of the camera 4 is changed by the rotation of the second motor 19.

[0071] Under the above setting, the camera 4 moves in such a way that the second motor 19 rotates, and the rotation of the second motor 19 drives the first screw 15 to rotate, and the rotation of the first screw 15 drives the turntable 10 and the camera 4 to change their positions through the slide bar 14, and the rotation connection between the slide bar 14 and the turntable 10 facilitates the camera 4 to be perpendicular to the ground;

[0072] Specifically, the vehicle deviation detection mechanism includes a first base 12, and two symmetrical slides 13 are slidably connected to the upper surface of the first base 12. The slides 13 protrude from the road surface, and the two slides 13 gradually rise toward both sides of the road. The bottom end of the first base 12 is fixedly connected to a first telescopic rod 20, and the bottom end of the slide 13 is fixedly connected to a pressure rod 22. The top movable end of the first telescopic rod 20 is fixedly connected to the bottom end of the slide 13.

[0073] The first telescopic rod 20 and the second telescopic rod 21 in the present invention are elastic supporting members, and there are return springs inside, which are prior art and will not be elaborated here;

[0074] Specifically, each side of the first base 12 is also fixedly connected to a fixed rod 28, a second telescopic rod 21, two fixed pulleys 25 and a slide cylinder 24. The top movable end of the second telescopic rod 21 is rotatably connected to a movable pulley 27. When the pressure rod 22 moves downward, the top movable end of the second telescopic rod 21 can be pressed down.

[0075] Specifically, the piston 23 is slidably connected to the inner side of the slide cylinder 24, a tension sensor 40 is fixedly connected to the inner side of one end of the slide cylinder 24, a tension spring 41 is provided on the inner side of the slide cylinder 24, and both ends of the tension spring 41 are respectively fixedly connected to one end of the tension sensor 40 and one end of the piston 23. In the initial state, the piston 23 is in the middle position of the slide cylinder 24, and at this time, the tension spring 41 is not subjected to force.

[0076] Specifically, a pull rope 26 is fixedly connected to the outer side of the fixed rod 28 . The pull rope 26 is sequentially wound around a movable pulley 27 and two fixed pulleys 25 and then fixedly connected to the other end of the piston 23 . The displacement distance of the piston 23 is obtained through a tension sensor 40 .

[0077] Specifically, one of the fixed pulleys 25 is flush with the fixed rod 28 , and the movable pulley 27 is disposed between the fixed rod 28 and the fixed pulley 25 flush with the fixed rod 28 .

[0078] Under the above settings, the present invention is provided with a vehicle deviation detection mechanism, which can roughly identify the center position and deflection angle of the vehicle 8 on the road, and the subsequent camera 4 will be displaced and deflected according to the data obtained by the vehicle deviation detection mechanism, so as to achieve more accurate and efficient identification;

[0079] The detection method of the vehicle deviation detection mechanism is as follows: when the vehicle 8 enters the factory, if the front wheels of the vehicle pass through the two slide plates 13 at the same time or nearly at the same time, the system determines that the vehicle 8 has not deviated. At this time, the vehicle deviation detection mechanism can be used to identify whether the vehicle 8 is in the center position. When the vehicle 8 is not in the center position on the path, the camera 4 can be moved to the side of the deviation, so that the recognition angle of the camera 4 is closer to the license plate of the vehicle 8, thereby achieving efficient and effective recognition;

[0080] The vehicle deviation detection mechanism identifies whether the vehicle 8 is in the center position in the following manner: when the vehicle 8 is not in the center position on the path, when the two front wheels pass through the two slide plates 13, the contact positions of the two front wheels and the two slide plates 13 will be different, because the upper side of the slide plate 13 is inclined and protrudes from the road surface. At this time, the sinking degree of the two slide plates 13 will be different. By analyzing the sinking degree of the two slide plates 13, the offset position of the vehicle 8 on the road can be obtained, wherein the sinking of the slide plate 13 will act on the movable pulley 27 through the pressure rod 22, and the descent of the movable pulley 27 will pull the piston 23 to the side away from the tension sensor 40 through the pull rope 26, and the tension sensor 40 is stressed. The force value of the tension sensor 40 can directly reflect the sinking depth of the slide plate 13, thereby reflecting the position of the wheel on the side on the slide plate 13. After obtaining the positions of the two wheels on the two slide plates 13 respectively, the offset value of the vehicle 8 on the road can be obtained, so that the camera 4 is moved according to the offset position so that the camera faces the license plate of the vehicle 8 directly, thereby achieving more efficient recognition;

[0081] The purpose of the present invention in arranging the movable pulley 27 between the fixed rod 28 and the fixed pulley 25 flush with the fixed rod 28 is that, because the height difference between the left and right sides of the skateboard 13 is small, when the movable pulley 27 descends, the present invention can pull the pull ropes 26 on both sides of the movable pulley 27. Under this arrangement, the descending distance of the movable pulley 27 converted into the stretching distance of the pull rope 26 will be increased, thereby increasing the sensitivity of the movement of the piston 23 and increasing the sensitivity of the force recognition of the tension sensor 40.

[0082] Example 2

[0083] This embodiment is a further improvement of embodiment 1. Figure 1-12 ,

[0084] The vehicle deviation detection mechanism identifies whether the vehicle 8 is in a deflection in the following manner: when the vehicle 8 is deflected when entering the factory, there will be a time difference when the two front wheels pass through the two skateboards 13 respectively, that is, there will be a difference in the value changes of the two tension sensors 40. When the vehicle 8 first passes through the skateboard 13 on one side, the vehicle 8 will tilt in the direction of the skateboard 13 on the other side. Therefore, the deflection angle of the vehicle 8 when entering the factory can be determined, and the camera 4 can be rotated according to the deflection direction so that the camera faces the license plate of the vehicle 8 relatively directly, thereby achieving more efficient recognition.

[0085] Example 3

[0086] This embodiment is a further improvement of embodiment 1. Figure 1-Figure 12 ,

[0087] When the vehicle deviates into the factory and the vehicle 8 is not in the center of the path, the slide plate 13 of the present invention can also be identified by referring to the above two methods, and the camera 4 can change the position and shift the angle at the same time.

[0088] Example 4

[0089] This embodiment is a further improvement of embodiment 1. Figure 1-Figure 15 ,

[0090] The control system also includes a second base 30, the top of which is rotatably connected to an inclined plate 29 via a hinge. After the inclined plate 29 falls, it can remain flush with the ground. A support plate 31 is fixedly connected to the inner side of the second base 30. The top of the support plate 31 is rotatably connected to an electric push rod 35 via a hinge. The top of the electric push rod 35 is rotatably connected to the bottom end of the inclined plate 29 via a hinge. The lifting and lowering movement of the opening side of the inclined plate 29 is achieved by the extension and retraction of the movable end of the electric push rod 35.

[0091] Specifically, two connecting plates 36 are fixedly connected to the bottom end of the inclined plate 29, a second screw 37 is rotatably connected between the two connecting plates 36, a limiting rod 38 is fixedly connected between the two connecting plates 36, a slider 34 is slidably connected to the outer side of the limiting rod 38, the inner side of the slider 34 is spirally connected to the outer side of the second screw 37, a third motor 42 is fixedly connected to one of the connecting plates 36, the end of the main shaft of the third motor 42 is fixedly connected to the second screw 37, one end of the slider 34 is fixedly connected to the nozzle 33, and the position of the nozzle 33 is adjusted by rotating the third motor 42.

[0092] Specifically, a water pump 32 is fixedly connected to the bottom end of the second base 30 , an input end of the water pump 32 is connected to a water supply pipe, and an output end of the water pump 32 is connected to a water inlet end of the nozzle 33 through a hose.

[0093] Under the above settings, after adjusting the position and angle of the camera 4, if the camera 4 still cannot achieve effective recognition, the access control system will determine that the license plate position of the vehicle 8 is covered by dust, etc. The license plate position is generally in the middle position of the front bottom of the vehicle. At this time, the camera 4 can obtain the position of the vehicle 8 in the factory access channel through the vehicle offset detection mechanism, thereby changing the position of the nozzle 33. The horizontal movement of the nozzle 33 is achieved by the third motor 42 driving the second screw 37, so that the nozzle 33 faces the license plate of the vehicle 8, the water pump 32 works, and the active end of the electric push rod 35 continuously reciprocates, so that the inclined plate 29 reciprocates up and down, and the nozzle 33 will spray water toward the license plate of the vehicle 8 to clean it, so as to facilitate the camera 4 to recognize the vehicle information.

[0094] When the camera 4 still cannot recognize the information of the vehicle 8 or the vehicle information does not match the information pre-stored in the backend server 2 after the license plate is cleaned by spraying water, the camera 4 will take a snapshot of the vehicle 8 and store it in the backend server 2 and activate the alarm 39 to increase the safety of the factory area;

[0095] When the staff in the security booth 1 manually opens the crossbar 7 , the camera 4 in the present invention will also capture the vehicle 8 and store it in the backend server 2 .

[0096] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent access control system based on the Internet of Things, comprising a backend server (2), a security booth (1) with an alarm (39) on the top, a gate lifter (3), a camera (4) and a support base (6), wherein the output end of the gate lifter (3) is rotatably connected to a crossbar (7), and data transmission is achieved between the gate lifter (3) and the backend server (2) via a wireless network, characterized in that: The control system also includes a vehicle deviation detection mechanism arranged at the middle position of the entry path, a slide groove is provided on the cross bar (7), a slide rod (14) is slidably connected to the inner side of the slide groove, a turntable (10) is fixedly connected to the front end of the slide rod (14), a rotating wheel (9) is rotatably connected to the inner side of the bottom end of the turntable (10), the outer side of the rotating wheel (9) is in the shape of a toothed ring, the center of the bottom end of the rotating wheel (9) is fixedly connected to the top end of the camera (4), and the camera (4) can be displaced and deflected according to the deviation data provided by the vehicle deviation detection mechanism to be in a The optimal identification position is provided on the cross bar (7) with a tilt sensor (11) for detecting the tilt state of the cross bar (7); the inner side of the turntable (10) is rotatably connected with a toothed ring (18); the inner side of the turntable (10) is fixedly connected with a first motor (16); the output end of the first motor (16) is fixedly connected with a gear (17); the gear (17) is meshed with the toothed ring (18); the outer side of the toothed ring (18) is meshed with the outer side of the rotating wheel (9); and the deflection of the angle of the camera (4) is achieved through the first motor (16); The vehicle deviation detection mechanism comprises a first base (12), the upper surface of which is slidably connected to two symmetrical slide plates (13), the slide plates (13) protrude from the road surface, and the two slide plates (13) gradually rise in the directions of both sides of the road, the bottom end of the first base (12) is fixedly connected to a first telescopic rod (20), the bottom end of the slide plate (13) is fixedly connected to a pressure rod (22), the top movable end of the first telescopic rod (20) is fixedly connected to the bottom end of the slide plate (13), each side of the first base (12) is also fixedly connected to a fixed rod (28), a second telescopic rod (21), two fixed pulleys (25) and a slide cylinder (24), the top movable end of the second telescopic rod (21) is rotatably connected to a movable pulley (27), when the pressure rod (22) moves downward, the top movable end of the second telescopic rod (21) can be pressed down, and the inner side of the slide cylinder (24) A piston (23) is slidably connected, a tension sensor (40) is fixedly connected to the inner side of one end of the slide cylinder (24), a tension spring (41) is arranged on the inner side of the slide cylinder (24), and the two ends of the tension spring (41) are respectively fixedly connected to one end of the tension sensor (40) and one end of the piston (23). In an initial state, the piston (23) is in the middle position of the slide cylinder (24), at which time, the tension spring (41) is not subjected to force, a pull rope (26) is fixedly connected to the outer side of the fixed rod (28), and the pull rope (26) is successively wound around a movable pulley (27) and two fixed pulleys (25) and then fixedly connected to the other end of the piston (23), and the displacement distance of the piston (23) is obtained through the tension sensor (40), one of the fixed pulleys (25) is flush with the fixed rod (28), and the movable pulley (27) is arranged between the fixed rod (28) and the fixed pulley (25) flush with the fixed rod (28).

2. According to the Internet of Things-based intelligent access control system of claim 1, it is characterized by: A second motor (19) is fixedly connected to the inner side of the cross bar (7), a first screw rod (15) is fixedly connected to the end of the main shaft of the second motor (19), the first screw rod (15) is rotatably arranged in a slide groove, the outer side of the first screw rod (15) is spirally connected to the inner side of the slide rod (14), and the position of the camera (4) is changed by the rotation of the second motor (19).

3. According to the Internet of Things-based intelligent access control system of claim 2, it is characterized by: The control system also includes a second base (30), the top end of which is rotatably connected to an inclined plate (29) via a hinge, and after the inclined plate (29) falls, it remains flush with the ground, and the inner side of the second base (30) is fixedly connected to a support plate (31), and the top end of the support plate (31) is rotatably connected to an electric push rod (35) via a hinge, and the top end of the electric push rod (35) is rotatably connected to the bottom end of the inclined plate (29) via a hinge, and the lifting and lowering movement of the opening side of the inclined plate (29) is achieved by the extension and retraction of the movable end of the electric push rod (35).

4. According to the IoT-based intelligent access control system of claim 3, it is characterized by: The bottom end of the tilting plate (29) is fixedly connected to two connecting plates (36), a second screw rod (37) is rotatably connected between the two connecting plates (36), a limiting rod (38) is fixedly connected between the two connecting plates (36), the outer side of the limiting rod (38) is slidably connected to a slider (34), the inner side of the slider (34) is spirally connected to the outer side of the second screw rod (37), a third motor (42) is fixedly connected to one of the connecting plates (36), the main shaft end of the third motor (42) is fixedly connected to the second screw rod (37), one end of the slider (34) is fixedly connected to a nozzle (33), and the position of the nozzle (33) is adjusted by rotating the third motor (42).

5. According to the Internet of Things-based intelligent access control system of claim 4, it is characterized by: A water pump (32) is fixedly connected to the bottom end of the second base (30); the input end of the water pump (32) is connected to a water supply pipe, and the output end of the water pump (32) is connected to a water inlet end of a nozzle (33) via a hose.

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