Mechanical parking equipment overload detection device and detection method

Abstract

The invention discloses a mechanical parking equipment overload detection device and detection method. Comprising a steel structure frame, a vehicle entrance hall and a control system are arranged on the steel structure frame, two sets of overload detection devices are arranged on the front portion of an entrance platform which is arranged in the vehicle entrance hall and used for parking a vehicle, and each set of overload detection device corresponds to a left tire and a right tire of the vehicle; each set of overload detection device comprises a weighing supporting seat, a weighing sensor, a weighing platform and a transmitter, the lower end of the weighing supporting seat is fixed on the inlet platform, the lower end of the weighing sensor is fixed on the weighing supporting seat, and the weighing platform is connected to the weighing sensor; the weighing sensor is connected with the transmitter, and the transmitter is connected with the control system. The overload detection is firstly carried out before the vehicle enters the garage, the control system calculates and analyzes the detection data of the overload detection device to find whether the vehicle to be put in the garage is overweight or not, measures including alarming and the like can be taken immediately, the overloaded vehicle is prevented from entering the garage, and equipment is prevented from being overloaded for use.

Description

Technical Field

[0001] The present invention relates to a vehicle weighing device, in particular to a vehicle weighing device and method used in mechanical parking equipment, belonging to the technical field of mechanical three-dimensional parking equipment. Background Art

[0002] The appearance of new energy vehicles is similar to that of ordinary vehicles, but they are much heavier. Therefore, we cannot judge whether the vehicle meets the parking requirements of mechanical parking equipment based solely on its appearance size. More importantly, we need to detect the weight of the vehicle to ensure that the mechanical parking equipment is not overloaded to ensure the safety of personnel, vehicles and parking equipment.

[0003] In the past, mechanical parking equipment was not equipped with an overload detection device, and only relied on controlling the overload of the lifting motor to indirectly detect whether the vehicle was overweight. According to the requirements of Article A5.12 of TSG51-2023 "Technical Regulations for Safety of Lifting Machinery", paragraph (5) of the overload detection device, "Mechanical parking equipment should be equipped with an overload limiter. When the weight of the vehicle exceeds 95% of the rated load, the overload limiter should send an alarm signal; when the weight reaches 100% to 110% of the rated load, the overload limiter should function and automatically cut off the lifting power supply." And since January 2024, special equipment testing institutes at all levels have been required to inspect and accept mechanical parking equipment in accordance with this new regulation, and the annual inspection of old mechanical parking equipment is also required to comply with this new regulation. For this reason, it is necessary to develop an overload detection device that is low-cost and accurate in overload detection, which can not only meet the installation of new mechanical parking equipment but also be suitable for the renovation of old mechanical parking equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a mechanical parking equipment overload detection device and a detection method to solve the problems existing in the background technology.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A mechanical parking equipment overload detection device comprises a steel structure frame, a vehicle entrance lobby and a control system are arranged on the steel structure frame, an entrance platform for parking cars is arranged in the vehicle entrance lobby, and is characterized in that: two sets of overload detection devices are arranged at the front of the entrance platform, and each set of overload detection devices corresponds to the left and right tires of the vehicle respectively; each set of overload detection devices comprises a weighing support seat, a weighing sensor, a weighing platform and a transmitter, the lower end of the weighing support seat is fixed on the entrance platform, the lower end of the weighing sensor is fixed on the weighing support seat, and the weighing platform is connected to the weighing sensor; the weighing sensor is connected to the transmitter, and the transmitter is connected to the control system.

[0006] By adopting the above technical solution, an overload detection device is set at the front of the vehicle entrance platform. The vehicle is first tested for overload before entering the warehouse. The control system can find out whether the vehicle to be entered is overweight by calculating and analyzing the detection data of the overload detection device, and can immediately take measures including alarm to avoid overloaded vehicles from entering the warehouse and prevent the equipment from being overloaded, thereby eliminating safety hazards and ensuring the safe operation of the parking equipment.

[0007] In the above-mentioned overload detection device for mechanical parking equipment, each set of the overload detection device includes two weighing sensors, and the two weighing sensors jointly support a weighing platform.

[0008] Furthermore, the two weighing sensors are arranged side by side on the left and right.

[0009] By adopting the above technical solution, each overload detection device includes two weighing sensors, which jointly support a weighing platform, and the two weighing sensors are arranged side by side on the left and right, which can avoid inaccurate weighing due to uneven force on the weighing platform.

[0010] In the above-mentioned overload detection device for mechanical parking equipment, a display and an alarm unit are installed on the steel structure frame located in the vehicle entrance hall. When the control system detects overload, the control system controls the alarm unit to alarm; the display and the alarm unit are both connected to the control system.

[0011] Furthermore, the alarm unit includes a buzzer alarm, an indicator light, and an LED display screen.

[0012] In the above-mentioned overload detection device for mechanical parking equipment, a vehicle overlength detection device and a vehicle presence detection device are provided on the steel structure frame of the vehicle entrance lobby.

[0013] Furthermore, the steel structure frame of the vehicle entrance hall includes a left front pillar, a right front pillar, a left rear pillar, and a right rear pillar. The vehicle overlength detection device is a first group of photoelectric sensors arranged on the left front pillar and the right front pillar, and a second group of photoelectric sensors arranged on the left rear pillar and the right rear pillar; the vehicle presence detection device is a third group of photoelectric sensors arranged on the left front pillar and the right rear pillar.

[0014] Furthermore, the photoelectric sensor is a through-beam photoelectric sensor; The transmitting end of the first group of photoelectric sensors is arranged on the left front column, and the receiving end is arranged on the right front column; The transmitting end of the second group of photoelectric sensors is arranged on the left rear pillar, and the receiving end is arranged on the right rear pillar; The transmitting end of the third group of photoelectric sensors is arranged on the left front column, and the receiving end is arranged on the right rear column.

[0015] The present invention also provides a method for detecting equipment overload by using the mechanical parking equipment overload detection device, comprising the following steps: S1: The driver drives into the vehicle entrance lobby; S2: The vehicle moves forward, and the front wheel of the vehicle passes over the overload detection device. The two weighing sensors corresponding to the left wheel measure the weight data P 左1 , P 左2 , the two weighing sensors corresponding to the right wheel measure the weight data P 右1 , P 右2 And automatically upload the measurement data to the control system; S3: The vehicle continues to move forward, and the rear wheel of the vehicle passes over the overload detection device. The two weighing sensors corresponding to the left wheel measure the weight data P 左3 , P 左4 , the two weighing sensors corresponding to the right wheel measure the weight data P 右3 , P 右4 And automatically upload the measurement data to the control system; S4: The vehicle moves forward to the designated position and stops; S5: The driver gets out of the vehicle and walks out of the vehicle entrance hall. The two weighing sensors corresponding to the left wheel measure the driver's weight data P 左5 , P 左6 ; S6: The control system calculates the weight of the vehicle according to the following formula: P = P 左1 +P 左2 +P 右1 +P 右2 +P 左3 +P 左4 +P 右3 +P 右4 -P 左5 -P 左6 ; S7: The control system compares the vehicle weight P with the rated load P0: When P < 0.95P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the parking space. At the same time, the display screen and the speaker voice prompt the driver of the vehicle to stop the vehicle, turn off the engine and leave the vehicle. The driver presses the confirmation parking button at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space. When 0.95P0<P<P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the parking space. At the same time, the display screen and the speaker voice prompt the driver of the vehicle that the equipment has reached the rated load, and the vehicle is stopped and the engine is turned off and the driver leaves the vehicle. The driver presses the confirmation parking button at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space. P≥P0, the control system controls the alarm unit to send out an alarm signal, and at the same time the display screen and the speaker voice remind the driver of the vehicle that the vehicle is overweight and prompt him to exit the vehicle entrance.

[0016] In the above method for detecting equipment overload by using the mechanical parking equipment overload detection device, before S2, there is also a step of: S21: The vehicle moves forward, the front of the vehicle blocks the first group of photoelectric sensors and the third group of photoelectric sensors at the same time, and the control system starts the overload detection program.

[0017] In the above method for detecting equipment overload by using the mechanical parking equipment overload detection device, the specific working process of S4 is as follows: S41: The vehicle continues to move forward and stops: S42: If the third group of photoelectric sensors is blocked, and the first group of photoelectric sensors and the second group of photoelectric sensors are not blocked, proceed to step S5; S43: If the third group of photoelectric sensors is blocked and the second group of photoelectric sensors is blocked, the control system controls the alarm unit to send an alarm signal to remind the vehicle that it is too long and prompt it to exit the vehicle entrance. Beneficial Effects

[0018] 1. An overload detection device is installed at the front of the vehicle entrance platform. The vehicle shall be firstly tested for overload before entering the warehouse. The control system can find out whether the vehicle to be entered into the warehouse is overweight by calculating and analyzing the detection data of the overload detection device, and can immediately take measures including alarm to avoid overloaded vehicles from entering the warehouse and prevent the overload of equipment, thus eliminating safety hazards and ensuring the safe operation of parking equipment.

[0019] 2. Each overload detection device includes two weighing sensors, which jointly support a weighing platform. The two weighing sensors are arranged side by side on the left and right to avoid inaccurate weighing due to uneven force on the weighing platform.

[0020] 3. The installation of this overload detection device does not affect the design of the original components. The structure is relatively independent and has stronger versatility.

[0021] 4. Simple structure, low failure rate and accurate weighing.

[0022] 5. It occupies a small space and has strong adaptability. It can meet the needs of various parking equipment types and also adapt to the needs of renovation of old parking equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overload detection device of the present invention installed in the vehicle entrance hall.

[0024] Figure 2 Schematic diagram of the overload detection device of the present invention.

[0025] Figure 3 It is a top view of the overload detection device of the present invention.

[0026] Figure 4 It is a side view of the overload detection device of the present invention.

[0027] In the figure: 1 right rear column, 2 entrance platform, 3 right front column, 4 overload detection device, 41 weighing support seat, 42 weighing sensor, 43 weighing platform; 5 vehicle entrance device, 6 the first group of photoelectric sensors, 7 the third group of photoelectric sensors, 8 the left front pillar, 9 the second group of photoelectric sensors, 10 the left rear pillar, 11 transmitter, 12 PLC controller. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of the present invention, the present invention is further described below through non-limiting embodiments in conjunction with the accompanying drawings.

[0029] The front, rear, left and right directions described in the present invention are described based on the front, rear, left and right directions shown in the accompanying drawings. For ease of description, only the parts related to the embodiments of the present invention are shown. Embodiment 1:

[0030] Please see Figures 1 to 4A mechanical parking equipment overload detection device comprises a steel structure frame, a vehicle entrance lobby and a control system are arranged on the steel structure frame, the vehicle entrance is usually arranged on the ground floor, an entrance platform 2 for parking cars is arranged in the vehicle entrance lobby, a vehicle entrance device 5 is arranged on the entrance platform 2, including a vehicle blocking system, a centering device, a micro-lifting platform and a lifting mechanism for driving the micro-lifting platform to move up and down, etc.; in order to realize the normal entry and exit of the vehicle, some vehicle entrance platforms 2 are also provided with a rotating device; a vehicle detection device is arranged in the vehicle entrance, and the vehicle detection device is connected to the control system, including a detection device for detecting the presence or absence of the vehicle and a vehicle height detection device for detecting the height of the vehicle, a vehicle length detection device for detecting the length of the vehicle, a vehicle width detection device for detecting the width of the vehicle, and a vehicle arrival detection device; in the parking procedure, the control system determines whether the entering vehicle is suitable for parking according to the detection result. If the size exceeds the parking specification of the parking equipment and is not suitable for parking, the subsequent procedures are stopped and the driver is reminded to drive out. In this embodiment, two sets of overload detection devices 4 are provided at the front of the entrance platform 2, and each set of overload detection devices 4 corresponds to the left and right tires of the vehicle respectively; each set of overload detection devices 4 includes a weighing support seat 41, a weighing sensor 42, a weighing platform 43 and a transmitter 11, the lower end of the weighing support seat 41 is fixed on the entrance platform 2, the lower end of the weighing sensor 42 is fixed on the weighing support seat 41, and the weighing platform 43 is connected to the weighing sensor 42; the weighing sensor 42 is connected to the transmitter 11, and the transmitter 11 is connected to the control system. In this embodiment, the transmitter 11 adopts the LZ-SZQ4-485 transmitter, and the control system adopts the PLC control system.

[0031] Specifically, each set of overload detection device 4 includes two weighing sensors 42, and the two weighing sensors 42 jointly support a weighing platform 43 to avoid inaccurate weighing due to uneven force on the weighing platform. The two weighing sensors 42 are arranged side by side. In this embodiment, the weighing sensor 42 adopts LZ-ZCH-1.5T type weighing sensor.

[0032] A display and an alarm unit are installed on the steel structure frame located at the vehicle entrance hall. When the control system detects overload, the control system controls the alarm unit to alarm; the display and the alarm unit are both connected to the control system. In this embodiment, the alarm unit includes a buzzer alarm, a horn, an indicator light, and an LED display screen.

[0033] The steel structure frame of the vehicle entrance lobby is provided with a vehicle over-length detection device and a vehicle presence detection device. The steel structure frame of the vehicle entrance lobby includes a left front pillar 8, a right front pillar 3, a left rear pillar 10, and a right rear pillar 1. The vehicle over-length detection device is a first group of photoelectric sensors 6 arranged on the left front pillar 8 and the right front pillar 3, and a second group of photoelectric sensors 9 arranged on the left rear pillar 10 and the right rear pillar 1; the vehicle presence detection device is a third group of photoelectric sensors 7 arranged on the left front pillar 8 and the right rear pillar 1.

[0034] The transmitting end of the first group of photoelectric sensors 6 is arranged on the left front column 8, and the receiving end is arranged on the right front column 3; The transmitting end of the second group of photoelectric sensors 9 is arranged on the left rear pillar 10, and the receiving end is arranged on the right rear pillar 1; The transmitting end of the third group of photoelectric sensors 7 is arranged on the left front column 8 , and the receiving end is arranged on the right rear column 1 .

[0035] The above-mentioned photoelectric sensor adopts Panasonic NX5-M10RA through-beam photoelectric sensor.

[0036] In this embodiment, the control system uses host computer software + PLC controller, which is the existing technology and will not be described in detail. Embodiment 2:

[0037] The method for detecting equipment overload by using the mechanical parking equipment overload detection device described in the first embodiment comprises the following steps: S1: The driver drives into the vehicle entrance lobby; S21: the vehicle moves forward, the front of the vehicle blocks the first group of photoelectric sensors 6 and the third group of photoelectric sensors 7 at the same time, and the control system starts the overload detection program; S2: The vehicle moves forward, and the front wheel of the vehicle passes over the overload detection device 4. The two weighing sensors 42 corresponding to the left wheel measure the weight data P 左1 , P 左2 The two weighing sensors 42 corresponding to the right wheel measure the weight data P 右1 , P 右2 And automatically upload the measurement data to the control system; S3: The vehicle continues to move forward, and the rear wheel of the vehicle passes over the overload detection device 4. The two weighing sensors 42 corresponding to the left wheel measure the weight data P 左3 , P 左4 The two weighing sensors 42 corresponding to the right wheel measure the weight data P 右3 , P 右4 And automatically upload the measurement data to the control system; S41: The vehicle continues to move forward and stops: S42: If the third group of photoelectric sensors 7 is blocked, and the first group of photoelectric sensors 6 and the second group of photoelectric sensors 9 are not blocked, proceed to step S5; S43: If the third group of photoelectric sensors 7 is blocked and the second group of photoelectric sensors 9 is blocked, the control system controls the alarm unit to send an alarm signal to remind the vehicle to be overlong and prompt it to exit the vehicle entrance; S4: The vehicle moves forward to the designated position and stops; S5: The driver gets off the vehicle and walks out of the vehicle entrance hall. The two weighing sensors 42 corresponding to the left wheel measure the driver's weight data P 左5 , P 左6 ; S6: The control system calculates the weight of the vehicle according to the following formula: P = P 左1 +P 左2 +P 右1 +P 右2 +P 左3 +P 左4 +P 右3 +P 右4 -P 左5 -P 左6 ; S7: The control system compares the vehicle weight P with the rated load P0: When P < 0.95P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the parking space. At the same time, the display screen and the speaker voice prompt the driver of the vehicle to stop the vehicle, turn off the engine and leave the vehicle. The driver presses the confirmation parking button at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space. When 0.95P0<P<P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the parking space. At the same time, the display screen and the speaker voice prompt the driver of the vehicle that the equipment has reached the rated load, and the vehicle is stopped and the engine is turned off and the driver leaves the vehicle. The driver presses the confirmation parking button at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space. P≥P0, the control system controls the alarm unit to send out an alarm signal, and at the same time the display screen and the speaker voice remind the driver of the vehicle that the vehicle is overweight and prompt him to exit the vehicle entrance.

[0038] The weighing sensor provided in the present invention transmits the vehicle's two weighing data information and the driver's body weight information to the control system, and the control system automatically calculates the vehicle's weight, compares the vehicle's weight with the rated load, determines whether the vehicle is allowed to enter the warehouse, and issues an alarm prompt signal. The above actions are all controlled by the control system; the specific control programming process is designed according to the characteristics of the vehicle storage process and the needs of actual operation, which does not belong to the structural scope of the present invention, and the circuit layout and connection for realizing the control can be designed according to the hardware structure of the present invention, combined with the purpose of the action, and overcome with the help of common sense in the field of electronic control, so it will not be described in detail.

[0039] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "left", "right", "front", "back", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. The above terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, it can be an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

[0042] The above-listed implementation methods are only for the purpose of understanding the present invention and are not intended to limit the technical solutions described in the present invention. Ordinary technicians in the relevant fields can make various changes or modifications based on the technical solutions described in the claims. All equivalent changes or modifications should be included in the scope of protection of the claims of the present invention.

Claims

1. A mechanical parking equipment overload detection device, comprising a steel structure frame, a vehicle entrance hall and a control system arranged on the steel structure frame, an entrance platform for parking cars arranged in the vehicle entrance hall, characterized in that: Two sets of overload detection devices are provided at the front of the entrance platform, and each set of overload detection devices corresponds to the left and right tires of the vehicle respectively; each set of overload detection devices includes a weighing support seat, a weighing sensor, a weighing platform and a transmitter, the lower end of the weighing support seat is fixed on the entrance platform, the lower end of the weighing sensor is fixed on the weighing support seat, and the weighing platform is connected to the weighing sensor; the weighing sensor is connected to the transmitter, and the transmitter is connected to the control system.

2. The overload detection device for mechanical parking equipment according to claim 1, characterized in that: Each set of overload detection devices includes two weighing sensors, and the two weighing sensors jointly support a weighing platform.

3. The overload detection device for mechanical parking equipment according to claim 2 is characterized in that: The two weighing sensors are arranged side by side on the left and right.

4. A mechanical parking equipment overload detection device according to claim 1, 2 or 3, characterized in that: A display and an alarm unit are installed on the steel structure frame located at the vehicle entrance lobby. When the control system detects overload, the control system controls the alarm unit to alarm; the display and the alarm unit are both connected to the control system.

5. The overload detection device for mechanical parking equipment according to claim 4 is characterized in that: The alarm unit comprises a buzzer alarm, a speaker, an indicator light and an LED display screen.

6. The overload detection device for mechanical parking equipment according to claim 1, characterized in that: A vehicle overlength detection device and a vehicle presence detection device are arranged on the steel structure frame of the vehicle entrance lobby.

7. The overload detection device for mechanical parking equipment according to claim 6, characterized in that: The steel structure frame of the vehicle entrance hall includes a left front pillar, a right front pillar, a left rear pillar, and a right rear pillar. The vehicle overlength detection device is a first group of photoelectric sensors arranged on the left front pillar and the right front pillar, and a second group of photoelectric sensors arranged on the left rear pillar and the right rear pillar; the vehicle presence detection device is a third group of photoelectric sensors arranged on the left front pillar and the right rear pillar.

8. The overload detection device for mechanical parking equipment according to claim 7, characterized in that: The photoelectric sensor is a through-beam photoelectric sensor; The transmitting end of the first group of photoelectric sensors is arranged on the left front column, and the receiving end is arranged on the right front column; The transmitting end of the second group of photoelectric sensors is arranged on the left rear pillar, and the receiving end is arranged on the right rear pillar; The transmitting end of the third group of photoelectric sensors is arranged on the left front column, and the receiving end is arranged on the right rear column.

9. A method for detecting equipment overload using the mechanical parking equipment overload detection device according to any one of claims 1 to 8, characterized in that: The steps include: S1: The driver drives into the vehicle entrance lobby; S2: The vehicle moves forward, and the front wheel of the vehicle passes over the overload detection device. The two weighing sensors corresponding to the left wheel measure the weight data P 左1 , P 左2 , the two weighing sensors corresponding to the right wheel measure the weight data P 右1 , P 右2 And automatically upload the measurement data to the control system; S3: The vehicle continues to move forward, and the rear wheel of the vehicle passes over the overload detection device. The two weighing sensors corresponding to the left wheel measure the weight data P 左3 , P 左4 , the two weighing sensors corresponding to the right wheel measure the weight data P 右3 , P 右4 And automatically upload the measurement data to the control system; S4: The vehicle moves forward to the designated position and stops; S5: The driver gets out of the vehicle and walks out of the vehicle entrance hall. The two weighing sensors corresponding to the left wheel measure the driver's weight data P 左5 , P 左6 ; S6: The control system calculates the weight of the vehicle according to the following formula: P= P 左1 +P 左2 +P 右1 +P 右2 +P 左3 +P 左4 +P 右3 +P 右4 -P 左5 -P 左6 ; S7: The control system compares the vehicle weight P with the rated load P0: When P<0.95P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the garage, and at the same time the display screen and the speaker voice prompt the driver of the vehicle to stop the vehicle, turn off the engine and leave the vehicle; The driver presses the button to confirm parking at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space; When 0.95P0<P<P0, the control system controls the alarm unit to send a signal to allow the vehicle to enter the garage. At the same time, the display screen and the speaker voice prompt the driver of the vehicle that the equipment has reached the rated load, and the driver should stop the vehicle, turn off the engine and leave the vehicle. The driver presses the button to confirm parking at the vehicle entrance, and the parking equipment continues to operate to send the vehicle to the target parking space; P≥P0, the control system controls the alarm unit to send out an alarm signal, and at the same time the display screen and the speaker voice remind the driver of the vehicle that the vehicle is overweight and prompt him to exit the vehicle entrance.

10. The method for detecting equipment overload by using a mechanical parking equipment overload detection device according to claim 9, characterized in that: Before S2, there are steps: S21: The vehicle moves forward, the front of the vehicle blocks the first group of photoelectric sensors and the third group of photoelectric sensors at the same time, and the control system starts the overload detection program.

11. The method for detecting equipment overload by using a mechanical parking equipment overload detection device according to claim 9, characterized in that: The specific working process of S4 is as follows: S41: The vehicle continues to move forward and stops: S42: If the third group of photoelectric sensors is blocked, and the first group of photoelectric sensors and the second group of photoelectric sensors are not blocked, proceed to step S5; S43: If the third group of photoelectric sensors is blocked and the second group of photoelectric sensors is blocked, the control system controls the alarm unit to send an alarm signal to remind the vehicle that it is too long and prompt it to exit the vehicle entrance.

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