Ferris wheel lift car door lock state monitoring system and method

Abstract

The invention provides a ferris wheel lift car door lock state monitoring system and method. The system comprises an angle sensor which collects angle data in real time; the first wireless module is used for transmitting the angle data to an upper computer in real time; the door lock state sensor is used for forming a door lock locking signal according to the door lock state of the corresponding lift car; the second wireless module is used for transmitting the door lock locking signal to the upper computer in real time; and the upper computer is used for determining the car position of each car according to the angle data and determining whether the car door lock of the car is abnormal or not according to the car position of each car and the door lock locking signal. The angle signal is detected in real time through the angle sensor, the door lock locking condition of each car is fed back through the door lock state sensor, the upper computer judges the locking state of each car door lock, and whether the car door lock state is normal or not is judged by combining the car position and the door lock opening and closing state; and the real-time monitoring of the state of the car door lock in the operation process of the ferris wheel is realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of safety control, and in particular to a monitoring system and method for a Ferris wheel car door lock status. Background Art

[0002] During the operation of the Ferris wheel, due to impact, vibration and unsafe behavior of tourists, in a few extreme cases, the car door lock device may fail and the car door may open, seriously affecting the personal safety of passengers. At present, the Ferris wheel cars all adopt a manual sliding door design. The control of the door lock and the inspection of the locking status are all performed by the staff standing on the platform. However, after the car leaves the platform area, the staff cannot know the locking status of the door lock in time, and cannot take emergency measures in time when an accident occurs. Therefore, there is an urgent need for a method to monitor the car door lock status during the operation of the Ferris wheel to improve the safety of the Ferris wheel operation. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a system and method for monitoring the lock status of a Ferris wheel car door, so as to solve the above-mentioned problems existing in the prior art.

[0004] The embodiment of the present disclosure adopts the following technical scheme: a monitoring system for the door lock status of a Ferris wheel car, comprising: an angle sensor arranged at a fixed position on the Ferris wheel turntable, for collecting angle data in real time; a first wireless module communicatively connected to the angle sensor, for transmitting the angle data to a host computer in real time; a door lock status sensor arranged on each car, for forming a door lock locking signal according to the door lock status of the corresponding car; a second wireless module communicatively connected to the door lock status sensor, for transmitting the door lock locking signal to the host computer in real time; a host computer, for determining the car position of each car according to the angle data, and determining whether the car door lock of the car is abnormal according to the car position of each car and the door lock locking signal.

[0005] In some embodiments, the host computer is specifically used to: determine the real-time angle of each car according to the angle data and the preset angle relationship as the car position of the car; wherein the preset angle relationship is based on the installation position of the angle sensor and the actual angle relationship between each car in the running plane of the Ferris wheel.

[0006] In some embodiments, the door lock status sensor includes at least a micro travel switch and a first I / O control module, the micro travel switch is arranged in the lock tongue frame of the car door lock, and the first I / O control module is communicatively connected with the second wireless module.

[0007] In some embodiments, when the car door lock is in a locked state, the lock tongue of the car door lock pushes the micro travel switch, causing the micro travel switch to close, and the first I / O control module forms a door lock locking signal; when the car door lock is in an unlocked state, there is no contact between the lock tongue of the car door lock and the micro travel switch, causing the micro travel switch to disconnect, and the first I / O control module interrupts the formation of the door lock locking signal.

[0008] In some embodiments, the host computer is specifically used to: determine that the car door lock is in a locked state when the door lock locking signal is received; determine that the car door lock is in an open state when the door lock locking signal is not received; determine whether the car is in the platform area according to the car position; when the car is not in the platform area and the car door lock of the car is in an open state, determine that the car door lock is in an abnormal state and issue an alarm; otherwise, determine that the car door lock is in a normal state.

[0009] In some embodiments, it also includes: a second I / O control module, a relay and an alarm circuit; when the host computer determines that the car door lock is in an abnormal state, it generates an alarm signal; the second I / O control module is communicatively connected to the host computer, and is used to drive the relay to close when the alarm signal is received; the alarm circuit forms a loop when the relay is closed, and performs a sound alarm and / or a photoelectric alarm.

[0010] In some embodiments, the host computer is connected to a display device for displaying the car position and door lock status in real time, and generating an alarm message when it is determined that the car door lock is in an abnormal state, and displaying the alarm message on the display device.

[0011] The disclosed embodiment also provides a method for monitoring the status of a Ferris wheel car door lock, comprising: receiving angle data transmitted by a first wireless module; receiving a door lock locking signal transmitted by a second wireless module; determining the car position of each car according to the angle data, and determining whether the car door lock of each car is abnormal according to the car position of each car and the door lock locking signal.

[0012] In some embodiments, determining the car position of each car based on the angle data includes: determining the real-time angle of each car as the car position of the car based on the angle data and a preset angle relationship; wherein the preset angle relationship is based on the installation position of the angle sensor and the actual angle relationship between each car in the running plane of the Ferris wheel.

[0013] In some embodiments, determining whether the car door lock of the car is abnormal based on the car position and the door lock locking signal of each car includes: determining that the car door lock is in a locked state when a door lock locking signal is received; determining that the car door lock is in an open state when the door lock locking signal is not received; determining whether the car is in the platform area according to the car position; when the car is not in the platform area and the car door lock of the car is in an open state, determining that the car door lock is in an abnormal state and issuing an alarm; otherwise, determining that the car door lock is in a normal state.

[0014] The beneficial effects of the embodiments of the present disclosure are: detecting angle signals in real time through angle sensors, feeding back the locking status of the door locks of each car through door lock status sensors, uploading the above signals to a host computer based on wireless communication to determine the locking status of each car door lock, determining whether the car door lock status is normal in combination with the car position and the door lock opening and closing status, thereby achieving real-time monitoring of the car door lock status during the operation of the Ferris wheel and assisting staff in protecting the safety of the Ferris wheel operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of a monitoring system for a Ferris wheel car door lock state in a first embodiment of the present disclosure;

[0017] Figure 2 It is a wiring diagram of the angle sensor and the first wireless module in the first embodiment of the present disclosure;

[0018] Figure 3 This is a front view of the handle device in the first embodiment of the present disclosure;

[0019] Figure 4 It is a side view of the handle device in the first embodiment of the present disclosure;

[0020] Figure 5 It is a schematic diagram of the back side of the handle device and the locking device in the first embodiment of the present disclosure;

[0021] Figure 6 It is a wiring diagram of the first I / O control module and the second wireless module in the first embodiment of the present disclosure;

[0022] Figure 7It is a wiring diagram of the second I / O control module in the first embodiment of the present disclosure;

[0023] Figure 8 A possible display interface in the first embodiment of the present disclosure;

[0024] Fig. 9 Flow chart of a method for monitoring the lock status of a Ferris wheel car door in the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will be combined with the drawings in one or more embodiments of this specification to clearly and completely describe the technical solutions in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0026] During the operation of the Ferris wheel, due to impact, vibration and unsafe behavior of tourists, in a few extreme cases, the car door lock device may fail and the car door may open, seriously affecting the personal safety of passengers. At present, the Ferris wheel cars all adopt a manual sliding door design. The control of the door lock and the inspection of the locking status are all performed by the staff standing on the platform. However, after the car leaves the platform area, the staff cannot know the locking status of the door lock in time, and cannot take emergency measures in time when an accident occurs. Therefore, there is an urgent need for a method to monitor the car door lock status during the operation of the Ferris wheel to improve the safety of the Ferris wheel operation.

[0027] In order to solve the above problems, the first embodiment of the present disclosure provides a monitoring system for the door lock status of a Ferris wheel car, and its structural schematic diagram is shown as follows: Figure 1 As shown, it mainly includes: an angle sensor 10, a first wireless module 20, a door lock state sensor 30, a second wireless module 40 and a host computer 50. Figures 2 to 8 The functional implementation of each part of the monitoring system in this embodiment is explained.

[0028] The angle sensor 10 is set at any fixed position on the Ferris wheel turntable. As the Ferris wheel turntable rotates, the angle sensor 10 can collect angle data in real time. The collected angle data can be used to characterize the position of each car during the rotation of the Ferris wheel. During actual installation, the angle sensor 10 can be installed in a waterproof box, and the waterproof box is fixed on the turntable to protect the angle sensor 10; during operation, the angle sensor 10 completes the collection of angle data based on a specific sampling frequency.

[0029] The first wireless module 20 is connected to the angle sensor 10 for communication, receives the angle data collected by the angle sensor 10 in real time, and transmits the angle data to the host computer 50 through wireless communication. In some embodiments, the first wireless module 20 may adopt a 4G-DTU (Data Transfer Unit) module, and the angle data of the angle sensor 10 is transmitted to the first wireless module 20 through a wired transmission method (such as RS485), and the first wireless module 20 transmits the received angle data to the host computer by using 4G wireless transmission. Figure 2 The wiring diagram of the angle sensor 10 and the first wireless module 20 is shown, wherein the angle sensor 10 uses Beiwei BWK217S, the first wireless module 20 uses ZOL 8305LN, the output end of the angle sensor 10 is connected to the input end of the first wireless module 20 via RS485, and the power supply ends of both are connected to the power supply of the position system.

[0030] The door lock state sensor 30 and the second wireless module 40 are actually set according to the number of cars ( Figure 1 Only one is shown in the figure), each car door lock is correspondingly provided with a door lock state sensor 30 and a second wireless module 40, which are used to form a door lock locking signal according to the door lock state of the car in which it is installed. Specifically, the door lock state sensor 30 at least includes a micro-travel switch and a first I / O control module, and the first I / O control module is communicatively connected with the second wireless module 40. Among them, the micro-travel switch is installed in the lock tongue frame of the car door lock, and combined with the mechanical structure of the car door lock, when it is in the locked state, the lock tongue of the door lock pushes the contact of the micro-travel switch to close the micro-travel switch, and the first I / O control module forms a door lock locking signal accordingly; when the car door lock is in the unlocked state, the lock tongue of the car door lock and the contact of the micro-travel switch are not in contact, and the micro-travel switch is in the disconnected state, and the first I / O control module interrupts the formation of the door lock locking signal.

[0031] Figures 3 to 5 A schematic diagram of the arrangement between a micro-switch and a car door lock is shown. Figures 3 to 5As shown, the mechanical structure of the car door lock mainly includes a handle device and a locking device. The handle device mainly consists of a fixed seat, a handle and an actuator. The fixed seat is the body of the handle device. The fixed seat is installed on the outside of the Ferris wheel car door frame through mounting holes and mounting screws. The handle and the actuator are installed on the fixed seat through a rotating pair, including a handle part (above the rotating pair) and an actuator part (below the rotating pair). The locking device mainly consists of a spring, a lock tongue, a lock tongue frame and other parts. The spring is installed on the fixed seat, one end of which rests on the fixed seat and is fixed here, and the other end is against the lock tongue and can move here; the lock tongue is the locking element of the locking device, which is installed on the fixed seat through a moving pair, and is in contact with the spring and the actuator at the same time. Under the action of the spring and the actuator, it can move horizontally along the fixed seat. The lock tongue frame is installed on the outside of the Ferris wheel car door frame through mounting holes and mounting screws. During installation, the lock tongue frame should maintain an appropriate distance from the fixed seat so that the lock tongue frame and the lock tongue can cooperate with each other to play a locking role.

[0032] The working principle of the handle device and the locking device is as follows: in the absence of external force, the spring pushes the lock tongue to the left and inserts it into the lock tongue frame. At this time, the door lock device is in a locked state. When the handle and the handle part of the actuator are pulled, the pulling force forms a torque through the rotating pair, and the handle and the actuator rotate counterclockwise around the rotating pair, and finally the actuator part of the handle and the actuator moves to the right. In this process, the actuator pushes the lock tongue to overcome the resistance of the spring and move to the right until the spring is fully compressed. At this time, the actuator can no longer push the lock tongue to move to the right, and the lock tongue has been completely pulled out of the lock tongue frame, and the door lock device is in an open state.

[0033] The micro-travel switch is installed on the lock tongue frame, and the contact of the micro-travel switch extends into the lock tongue frame. A small roller is installed at the end of the lock tongue to ensure good contact between the lock tongue and the contact of the micro-travel switch without jamming. When the car door lock device is in the locked state, the lock tongue pushes the contact of the micro-travel switch and the micro-travel switch is activated; when the car door lock device is in the open state, the lock tongue is pulled out of the lock tongue frame and the micro-travel switch is reset. It should be noted that Figures 3 to 5 The handle device and locking device shown are only a preferred embodiment that can be used as a car door lock. Other door lock structures can also be selected in actual use as long as they can cooperate with the micro-travel switch to achieve corresponding locking state feedback.

[0034] The second wireless module 40 of this embodiment can be a wireless module that is the same as the first wireless module 20, and is connected to the output end of the first I / O control module by wire to receive the door lock locking signal output by the first I / O control module and transmit it to the host computer 50 using wireless communication. Figure 6The wiring diagram of the first I / O control module and the second wireless module 40 is shown, wherein the first I / O control module uses ZOL 6802, and the second wireless module 40 uses ZOL 8305LN. In the figure, SQ represents the micro-travel switch. When SQ is closed, the first I / O control module forms a door lock locking signal and transmits it to the second wireless module 40 through RS485 communication, and the second wireless module 40 transmits it to the host computer using the 4G network. When SQ is disconnected, the first I / O control module interrupts the formation of the door lock locking signal, and the second wireless module 40 has no signal to transmit. At the same time, the first I / O control module and the second wireless module are powered by the door state system power supply. It should be noted that in actual implementation, the second wireless module used to transmit the car door lock locking signal uses the ZLAN 8305LN with a corresponding device ID number. Each door lock locking signal received by the host computer can confirm which second wireless module it is sent from, and then distinguish the door lock status of different cars according to the device ID number of the ZLAN 8305LN installed on each car on site.

[0035] In this embodiment, the host computer 50 is mainly used to realize signal integration and logical processing and analysis of data. It receives the angle data transmitted by the first wireless module and the door lock status signal transmitted by the second wireless module through wireless communication, analyzes and processes them based on pre-designed processing principles, and determines the status monitoring of each car door lock.

[0036] Specifically, it first determines the car position of each car based on the angle data. During the operation of the Ferris wheel, the position of each car changes continuously with the rotation of the wheel disc, but the relative position between each car is fixed. Therefore, the car position of all cars can be determined by the angle data collected by the angle sensor installed at a fixed position on the Ferris wheel turntable. After receiving the angle data collected in real time, the upper computer 50 can calculate the real-time angle of each car at the current moment based on the angle data and the preset angle relationship, as the car position of the car at the current moment. It should be noted that since the position and number of the cars are fixed, the angle difference between adjacent cars is also fixed. Combined with the actual installation position of the angle sensor and the actual angle relationship of each car in the operating plane of the Ferris wheel, a preset angle relationship can be formed for car position calculation.

[0037] Furthermore, the upper computer 50 will determine whether the car door lock is in an abnormal condition based on the car position of each car and its corresponding door lock status. Since the Ferris wheel implements an uninterrupted boarding and disembarking mode, it is not possible to determine whether there is an abnormal condition in the car door lock during the operation of the Ferris wheel by only monitoring the car door lock status. The car position must be monitored at the same time to monitor whether the car door lock status is normal. When it is detected that the car position is in the platform area, the car door lock can be opened. At this time, regardless of whether the car door lock status is detected to be in a locked state or an open state, the device can operate normally; when it is detected that the car position is in the operating area, the car door lock cannot be opened. At this time, if the car door lock status is detected to be in an open state, it means that there is an abnormal condition in the car door lock during the operation of the Ferris wheel. In this embodiment, 270 degrees can be limited to the center position of the vertical projection of the central axis of the Ferris wheel on the platform, and the platform position is further limited to the area where the angle data is between 258 degrees and 282 degrees. Of course, the angle range of the platform position can also be personalized according to the actual installation position of the angle sensor, the number of cars of the Ferris wheel, the size of the platform area, etc., and this embodiment does not limit it.

[0038] In actual implementation, the host computer determines the opening and closing state of the car door lock according to the received door lock locking signal. When the door lock is locked, the micro-motion forms a switch closure, and the first I / O control module continuously generates the door lock locking signal output. If the door lock is not locked, the first I / O control module will interrupt the generation of the door lock locking signal. Therefore, the host computer can determine that the car door lock is in a locked state when receiving the door lock locking signal; and determine that the car door lock is in an open state when not receiving the door lock locking signal. Then, according to the car position of each car, it is determined whether the car is in the platform area, and the car door lock that is not in the platform area and the car door lock is in an open state is in an abnormal state. At this time, an alarm can be issued to the user; and when the car is not in the platform area but the car door lock is in a locked state, it is determined that the car door lock is in a normal state. If the car is in the platform area, no matter whether the door lock is in a locked state or an open state, it will be determined that the door lock is normal.

[0039] In fact, corresponding to the operation process of a Ferris wheel, the host computer will simultaneously detect the door lock status of all cars at the same time. Combined with the operation characteristics of the Ferris wheel, at any time there will be at least one car in the platform area, and other cars are not in the platform area. Therefore, the logic for judging the abnormal door lock status of each car is different due to its different position. In fact, the host computer can output the monitoring results of the door lock status in combination with the logical relationship table shown in Table 1.

[0040] Table 1 Logical relationship table of car position, car door lock status and door lock status monitoring results

[0041]

[0042] Among them, A represents the car position, signal 1 indicates that the car position is in the operating area, and signal 0 indicates that the car position is in the platform area; B represents the car door lock status, signal 1 indicates that the car door lock status is in the open state, and signal 0 indicates that the car door lock status is in the locked state; F represents the monitoring result of the car door lock status during the operation of the Ferris wheel, signal 1 indicates abnormality, and signal 0 indicates normal.

[0043] In some embodiments, when the host computer determines that a car door lock is in an abnormal state, the host computer will perform an alarm operation. Specifically, the monitoring system may also include a second I / O control module, a relay, and an alarm circuit; when the host computer determines that a car door lock is in an abnormal state, it generates an alarm signal, and the second I / O control module is connected to the host computer for driving the relay to close when the alarm signal is received; the alarm circuit forms a loop when the relay is closed, and performs a sound alarm and / or a photoelectric alarm. Figure 7 The wiring diagram of the second I / O control module is shown, wherein the second I / O control module uses ZOL 6802, and the host computer transmits the alarm signal to the second I / O control module through the USB / RS485 interface. The second I / O control module drives the relay to close accordingly. The relay serves as the control end of the alarm circuit. When it is closed, the alarm circuit forms a loop, and the alarm circuit will sound an alarm and / or photoelectric alarm. The specific circuit structure of the alarm circuit is not shown in the figure, which can be implemented by conventional buzzer circuits, indicator light circuits, etc., which are not explained in this embodiment.

[0044] At the same time, the host computer is connected to the display device to display the car position and door lock status of each car it receives in real time, which is convenient for the staff to conduct real-time monitoring. In addition, when the host computer determines that a car door lock is abnormal, an alarm message is generated and displayed on the display device, such as through specific color text, pop-up reminders, etc., to inform the staff in time to deal with the abnormal situation. Figure 8 A possible display interface is shown, which specifically displays the position of car 1 and car 2, the opening and closing status of the car door locks, the door state alarm status, the alarm output relay status and the alarm information. Figure 8 From the contents recorded in the text, it can be seen that currently neither Car 1 nor Car 2 is in the platform area, but the car door lock of Car 1 is in the open state, and the alarm message prompts "Cabin 1 platform door is not closed properly", and further sound and light warnings can be given through buzzers, indicator lights, etc.

[0045] This embodiment detects the angle signal in real time through the angle sensor, and feeds back the locking status of the door locks of each car through the door lock status sensor. The above signal is uploaded to the upper computer based on wireless communication to judge the locking status of each car door lock, and combined with the car position and the door lock opening and closing status to judge whether the car door lock status is normal, thereby realizing real-time monitoring of the car door lock status during the operation of the Ferris wheel, and assisting the staff in protecting the safety of the Ferris wheel operation.

[0046] Based on the same inventive concept, the second embodiment of the present disclosure provides a method for monitoring the lock state of a Ferris wheel car door, which is mainly implemented by the host computer in the monitoring system of the first embodiment of the present disclosure. The flowchart of the monitoring method is shown in Figure 9, which at least includes steps S10 to S30:

[0047] S10, receiving angle data transmitted by the first wireless module;

[0048] S20, receiving a door lock locking signal transmitted by a second wireless module;

[0049] S30, determining the car position of each car according to the angle data, and determining whether the car door lock of the car is abnormal according to the car position of each car and the door lock locking signal.

[0050] It should be noted that there is no fixed execution order between the above steps S10 and S20. The two steps can be executed simultaneously, or S10 can be executed first and then S20, or S20 can be executed first and then S10. This embodiment is not limited, and is specifically executed according to the sampling frequency of the angle sensor connected to the host computer and the communication status of the wireless module. In addition, the angle data transmitted at one time in step S10 is only one, and the door lock locking signal transmitted by step S20 should have multiple at any time. The specific number is determined according to the number of cars. In fact, each car is equipped with a door lock status sensor to transmit the door lock status of the car to which it belongs. In actual implementation, the second wireless module used for transmitting the car door lock locking signal has a corresponding device ID number. Each door lock locking signal received by the host computer can confirm which second wireless module it is sent from, and then according to the device ID number of the corresponding Zhuo Lan 8305LN installed on each car on site, the door lock status of different cars can be distinguished.

[0051] In some embodiments, the car position of each car is determined based on the angle data, including: determining the real-time angle of each car as the car position of the car based on the angle data and a preset angle relationship; wherein the preset angle relationship is based on the installation position of the angle sensor and the actual angle relationship between the cars within the running plane of the Ferris wheel.

[0052] In some embodiments, based on the car position and door lock locking signal of each car, it is determined whether the car door lock of the car is abnormal, including: when a door lock locking signal is received, determining that the car door lock is in a locked state; when no door lock locking signal is received, determining that the car door lock is in an open state; determining whether the car is in the platform area based on the car position; when the car is not in the platform area and the car door lock of the car is in an open state, determining that the car door lock is in an abnormal state and issuing an alarm; otherwise, determining that the car door lock is in a normal state.

[0053] The specific content of the monitoring method executed by the upper computer in this embodiment has been described in detail in the first embodiment of the present disclosure and will not be repeated in this embodiment.

[0054] This embodiment detects the angle signal in real time through the angle sensor, and feeds back the locking status of the door locks of each car through the door lock status sensor. The above signal is uploaded to the upper computer based on wireless communication to judge the locking status of each car door lock, and combined with the car position and the door lock opening and closing status to judge whether the car door lock status is normal, thereby realizing real-time monitoring of the car door lock status during the operation of the Ferris wheel, and assisting the staff in protecting the safety of the Ferris wheel operation.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A monitoring system for the lock status of a Ferris wheel car door, characterized in that: include: An angle sensor is set at a fixed position on the Ferris wheel turntable to collect angle data in real time; A first wireless module in communication with the angle sensor, used for transmitting the angle data to a host computer in real time; A door lock state sensor is provided on each car, and is used to generate a door lock locking signal according to the door lock state of the corresponding car; A second wireless module communicatively connected to the door lock state sensor, used for transmitting the door lock locking signal to the host computer in real time; The host computer is used to determine the car position of each car according to the angle data, and determine whether the car door lock of each car is abnormal according to the car position of each car and the door lock locking signal.

2. The monitoring system according to claim 1, characterized in that: The host computer is specifically used for: According to the angle data and the preset angle relationship, the real-time angle of each car is determined as the car position of the car; wherein the preset angle relationship is based on the installation position of the angle sensor and the actual angle relationship between each car in the running plane of the Ferris wheel.

3. The monitoring system according to claim 1 or 2, characterized in that: The door lock state sensor at least includes a micro travel switch and a first I / O control module, the micro travel switch is arranged in the lock tongue frame of the car door lock, and the first I / O control module is communicatively connected with the second wireless module.

4. The monitoring system according to claim 3, characterized in that: When the car door lock is in a locked state, the lock tongue of the car door lock pushes the micro travel switch to close the micro travel switch, and the first I / O control module forms a door lock locking signal; when the car door lock is in an unlocked state, there is no contact between the lock tongue of the car door lock and the micro travel switch, so that the micro travel switch is disconnected, and the first I / O control module interrupts the formation of the door lock locking signal.

5. The monitoring system according to claim 4, characterized in that: The host computer is specifically used for: In the case where the door lock locking signal is received, determining that the car door lock is in a locked state; in the case where the door lock locking signal is not received, determining that the car door lock is in an open state; Determining whether the car is in the platform area according to the car position; When the car is not in the platform area and the car door lock of the car is in an open state, it is determined that the car door lock is in an abnormal state and an alarm is issued; otherwise, it is determined that the car door lock is in a normal state.

6. The monitoring system according to claim 5, characterized in that: Also includes: a second I / O control module, relays, and alarm circuits; When the host computer determines that the car door lock is in an abnormal state, generating an alarm signal; The second I / O control module is communicatively connected to the host computer, and is used to drive the relay to close when receiving the alarm signal; The alarm circuit forms a loop when the relay is closed, and performs an audible alarm and / or a photoelectric alarm.

7. The monitoring system according to claim 5, characterized in that: The host computer is connected to a display device for displaying the car position and door lock status in real time, and generating an alarm message when determining that the car door lock is in an abnormal state, and displaying the alarm message on the display device.

8. A method for monitoring the lock status of a Ferris wheel car door, characterized in that: include: Receiving angle data transmitted by the first wireless module; Receiving a door lock locking signal transmitted by a second wireless module; The car position of each car is determined according to the angle data, and whether the car door lock of each car is abnormal is determined according to the car position of each car and the door lock locking signal.

9. The monitoring method according to claim 8, characterized in that: Determining the car position of each car according to the angle data comprises: According to the angle data and the preset angle relationship, the real-time angle of each car is determined as the car position of the car; wherein the preset angle relationship is based on the installation position of the angle sensor and the actual angle relationship between each car in the running plane of the Ferris wheel.

10. The monitoring method according to claim 8 or 9, characterized in that: The determining whether the car door lock of each car is abnormal according to the car position and the door lock locking signal of each car includes: When receiving a door lock locking signal, determining that the car door lock is in a locked state; In the case where the door lock locking signal is not received, determining that the car door lock is in an open state; Determining whether the car is in the platform area according to the car position; When the car is not in the platform area and the car door lock of the car is in an open state, it is determined that the car door lock is in an abnormal state and an alarm is issued; otherwise, it is determined that the car door lock is in a normal state.

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