Boarding bridge passenger protection system and method of setting the same

Abstract

The application provides a boarding ladder passenger protection system and a setting method thereof. The system comprises a base, a passenger ladder, a safety grating assembly, a safety controller and a shielding sensor. The passenger ladder is arranged on the base and comprises a first passenger ladder and a second passenger ladder which are connected in sliding mode. The first passenger ladder and the second passenger ladder each comprise a step ladder and a chord plate arranged on both sides of the step ladder. The step ladder of the second passenger ladder is wider than that of the first passenger ladder. The safety grating assembly comprises a light projector and a light receiver. The light projector is arranged on the inner side of the chord plate on one side of the step ladder of the first passenger ladder and the second passenger ladder. The light receiver is arranged on the inner side of the chord plate on the other side of the step ladder of the first passenger ladder and the second passenger ladder. The safety controller is arranged on the base and controls the movement of the base and / or the passenger ladder according to the detection signal of the safety grating assembly. The shielding sensor is arranged on the outer side of the chord plate of the first passenger ladder close to the light projector of the second passenger ladder. The application can realize reliable full-coverage safety detection on the activity area of passengers on the boarding ladder at a low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of special vehicles for airports, and in particular to a boarding bridge passenger protection system and a setting method thereof. BACKGROUND

[0002] When a passenger plane is not parked at an airport jetty, a passenger elevator vehicle is needed to assist passengers to board or disembark. The driver of the passenger elevator vehicle generally confirms whether the passengers have left by direct vision or observation using monitoring equipment, and then operates the passenger elevator vehicle for subsequent actions after the passengers have all left the passenger elevator vehicle.

[0003] With the development of intelligentization of civil aviation equipment and unmannedization of airports, the demand for intelligentization of passenger elevator vehicles in the civil aviation industry is also increasing. In the development process of unmanned passenger elevator vehicles, it is difficult to reliably identify whether there are passengers and items left on the passenger elevator vehicle in various weather, lighting environments, and vehicle states using cameras or sensor solutions that cannot provide comprehensive coverage. Therefore, there is an urgent need to provide a boarding bridge passenger protection system to meet the needs of comprehensive and reliable detection of passenger activity areas. SUMMARY

[0004] The purpose of the present application is to provide a boarding bridge passenger protection system and a setting method thereof to solve the problem of the absence or imperfection of passenger protection devices in boarding bridges, and to achieve reliable and comprehensive safety detection of passenger activity areas on boarding bridges at a low cost.

[0005] The present application provides a boarding bridge passenger protection system, which comprises:

[0006] a base;

[0007] a passenger elevator arranged on the base, comprising a first passenger elevator and a second passenger elevator connected by sliding, the first passenger elevator and the second passenger elevator each comprising a step ladder and a chord plate arranged on both sides of the step ladder, the step ladder of the second passenger elevator being wider than the step ladder of the first passenger elevator;

[0008] a safety grating assembly comprising a light projector and a light receiver, the light projector being arranged inside the chord plate on one side of the step ladder of the first passenger elevator and the second passenger elevator, and the light receiver being arranged inside the chord plate on the other side of the step ladder of the first passenger elevator and the second passenger elevator, the position of the light receiver corresponding to the position of the light projector, the light projector being used to project light, and the light receiver being used to receive the light projected by the light projector;

[0009] a safety controller arranged on the base and connected to the safety grating assembly, the safety controller being used to control the movement of the base and / or the passenger elevator according to the detection signal of the safety grating assembly, and the movement of the base and / or the passenger elevator being limited when the safety grating assembly detects an object blocking;

[0010] The shielding sensors are arranged outside the chords of the first passenger elevator near the light projectors of the second passenger elevator, the number and position of the shielding sensors on the first passenger elevator correspond to the number and position of the light projectors on the second passenger elevator, and the shielding sensors are used to shield the detection signal transmission of the corresponding safety light barrier assembly to the safety controller.

[0011] In one embodiment, the installation position of the shielding sensor closest to the second passenger elevator on the first passenger elevator ensures that the shielding sensor closest to the second passenger elevator on the first passenger elevator is not triggered by the chords of the second passenger elevator when the second passenger elevator is fully extended from the first passenger elevator.

[0012] In one embodiment, the upper end of the passenger elevator is horizontally provided with a platform, and the platform includes a walking platform and chords arranged on both sides of the walking platform.

[0013] The inner side of the chord on one side of the walking platform is provided with a light projector, and the inner side of the chord on the other side is provided with a light receiver, and the position of the light receiver corresponds to the position of the light projector.

[0014] In one embodiment, the platform includes a fixed platform and a movable platform, the fixed platform and the movable platform each include a walking platform and chords arranged on both sides of the walking platform, one end of the fixed platform is connected to the upper end of the passenger elevator, the other end is slidingly connected to the movable platform, and the walking platform of the movable platform is wider than the walking platform of the fixed platform.

[0015] The inner side of the chord on one side of the walking platform of the fixed platform and the movable platform is provided with a light projector, the inner side of the chord on the other side of the walking platform of the fixed platform and the movable platform is provided with a light receiver, a shielding sensor is arranged outside the chord of the fixed platform near the light projector of the movable platform, the number and position of the shielding sensors on the fixed platform correspond to the number and position of the light projectors on the movable platform, the shielding sensors are used to shield the detection signal transmission of the corresponding safety light barrier assembly to the safety controller, and the installation position of the shielding sensor closest to the movable platform on the fixed platform ensures that the shielding sensor closest to the movable platform on the fixed platform is not triggered by the chords of the movable platform when the movable platform is fully extended from the fixed platform.

[0016] In one embodiment,

[0017] The outer sides of the chords on both sides of the step ladder of the first passenger elevator are each provided with a sliding rail, the inner sides of the chords on both sides of the step ladder of the second passenger elevator are each provided with a sliding block, and the second passenger elevator slides on the sliding rails through the sliding blocks and is slidingly connected to the first passenger elevator.

[0018] The outer sides of the chords on both sides of the walking platform of the fixed platform are each provided with a sliding rail, the inner sides of the chords on both sides of the walking platform of the movable platform are each provided with a sliding block, and the movable platform slides on the sliding rails through the sliding blocks and is slidingly connected to the fixed platform.

[0019] In one embodiment,

[0020] The light projector, light receiver, shielding sensor on the first passenger ladder and the light projector, light receiver on the second passenger ladder are arranged along the direction parallel to the slide rail on the first passenger ladder;

[0021] The light projector, light receiver, shielding sensor on the fixed platform and the light projector, light receiver on the movable platform are arranged along the direction parallel to the slide rail on the fixed platform.

[0022] In one embodiment, the boarding ladder passenger protection system further comprises a walking controller and an upper loading controller connected to the safety controller on the base;

[0023] The walking controller controls the movement of the base according to the instructions of the safety controller;

[0024] The upper loading controller controls the movement of the passenger ladder and the platform according to the instructions of the safety controller.

[0025] The present application also provides a setting method of a boarding ladder passenger protection system, comprising the following steps:

[0026] Based on the sliding speed of the second passenger ladder relative to the first passenger ladder or the sliding speed of the movable platform relative to the fixed platform, and the maximum sensing radius of the shielding sensor, the position of the shielding sensor closest to the second passenger ladder on the first passenger ladder or the shielding sensor closest to the movable platform on the fixed platform when expanded to the maximum distance is determined;

[0027] Based on the sliding speed of the second passenger ladder relative to the first passenger ladder or the sliding speed of the movable platform relative to the fixed platform, the maximum delay time of the safety light barrier, and the maximum delay time of the safety controller, the maximum segment length of the light projector and the light receiver on the passenger ladder or the platform is determined;

[0028] Based on the maximum segment length of the light projector and the light receiver on the passenger ladder or the platform, and the maximum setting length, the actual segment number and the actual segment length of the light projector and the light receiver on the passenger ladder or the platform are determined;

[0029] Based on the actual segment number and the actual segment length of the light projector and the light receiver on the passenger ladder or the platform, the installation position of the light projector and the light receiver on the passenger ladder or the platform is determined;

[0030] The position of the shielding sensor is set based on the position of the light projector.

[0031] In one embodiment, the calculation formula of the position of the shielding sensor closest to the second passenger ladder on the first passenger ladder or the shielding sensor closest to the movable platform on the fixed platform when expanded to the maximum distance is:

[0032] Lb1' = kb (b-tp1 v1);

[0033] Lb1'=Lb1-(kb·b·tp1·v1), wherein Lb1' is the distance from the sensing center point of the shielding sensor closest to the second passenger lift to the chord plate of the second passenger lift when the second passenger lift is fully extended, or the distance from the sensing center point of the shielding sensor closest to the movable platform to the chord plate of the movable platform when the movable platform is fully extended, kb is the first redundancy coefficient, b is the maximum sensing radius of the shielding sensor, tp1 is the signal delay time of the shielding sensor, and v1 is the sliding speed of the second passenger lift relative to the first passenger lift or the sliding speed of the movable platform relative to the fixed platform.

[0034] In one embodiment, the calculation formula of the maximum segment length of the light projector and the light receiver on the passenger lift or the platform is as follows:

[0035] L1'=v1 (t1-ta-tb);

[0036] wherein L1' is the maximum segment length of the light projector and the light receiver, t1 is the theoretical maximum acceptable time for the shielded safety light barrier to be exposed, ta is the maximum delay time of the safety light barrier, and tb is the maximum delay time of the safety controller.

[0037] The calculation formula of the actual segment number of the light projector and the light receiver on the passenger lift or the platform is as follows:

[0038] P'=P+1, P=Lm1' / L1' is the integer part, and Lm1'=Lm1-(kc Ln1);

[0039] wherein P' is the actual segment number of the light projector and the light receiver, Lm1 is the maximum setting length of the light projector and the light receiver, Lm1' represents the actual maximum setting length of the light projector and the light receiver, kc is the second redundancy coefficient, and Ln1 is the minimum distance from the light projector and the light receiver closest to the end of the chord plate to the end of the chord plate.

[0040] The calculation formula of the actual segment length of the light projector and the light receiver on the passenger lift or the platform is as follows: L1''=Lm1' / P'.

[0041] Compared with the prior art, the boarding ladder passenger protection system and the setting method thereof have the following beneficial effects:

[0042] 1) The boarding ladder passenger protection system can realize all-around monitoring of the boarding ladder passenger activity space by deploying the full-coverage safety light barrier assembly in the passenger passage area, thereby ensuring the dead-angle-free coverage of the boarding ladder passenger protection system.

[0043] 2) The boarding ladder passenger protection system can realize normal operation of the entire system during the extension and retraction of the mechanism on the boarding ladder, and can neither be mis-triggered by the movement of the mechanism nor fail to be detected, thereby being reliable and simple in logic.

[0044] 3) The application can improve operation efficiency through simplified logic design while ensuring system reliability, effectively balancing safety and job continuity, and providing key technical support for the intelligent upgrade of boarding ladders. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 A fully expanded state diagram of the boarding ladder passenger protection system of an embodiment of the application;

[0046] Figure 2 A fully expanded cross-sectional view of the boarding ladder passenger protection system of an embodiment of the application;

[0047] Figure 3 A fully retracted state diagram of the boarding ladder passenger protection system of an embodiment of the application;

[0048] Figure 4 A parameter diagram of the shielding sensor of an embodiment of the application.

[0049] REFERENCE NUMERALS

[0050] 1, safety grating assembly; 2, upper garment; 3, base; 4, safety controller; 5, upper garment controller; 6, walking controller; 71, first shielding sensor; 72, second shielding sensor; 8, platform slide rail; 9, sliding block; 10, ladder slide rail; 101, first light projector; 102, first light receiver; 103, second light projector; 104, second light receiver; 106, third light projector; 107, third light receiver; 108, fourth light projector; 109, fourth light receiver; 21, ladder; 211, first chord plate; 212, ladder step; 22, upper ladder; 221, second chord plate; 222, upper ladder step; 23, fixed platform; 231, third chord plate; 232, first walking table; 24, movable platform; 241, fourth chord plate; 242, second walking table. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0052] Secondly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the cross-sectional view of the device structure may be partially enlarged without the general proportion for the convenience of illustration, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions including length, width and depth should be included in actual production.

[0053] Thirdly, "one embodiment" or "an embodiment" in the present application refers to a specific feature, structure or property that can be included in at least one implementation of the present application. "In one embodiment", "an embodiment" appearing in different places in the specification do not refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other. The words "include", "contain" mean that the claimed features exist, but do not exclude the existence of one or more other features. The word "and / or" used in the present application includes any and all combinations of one or more of the related listed terms.

[0054] The present application provides a passenger protection system for boarding ladder, which comprises a base, a passenger ladder, a safety grating assembly and a safety controller. The passenger ladder is arranged on the base and used for passenger descending from cabin to ground, and comprises a step ladder and chord plates arranged on both sides of the step ladder. The safety grating assembly comprises a light projector and a light receiver. The light projector is arranged on the inner side of the chord plate on one side of the step ladder, and the light receiver is arranged on the inner side of the chord plate on the other side of the step ladder. The position of the light receiver corresponds to the position of the light projector. The light projector is used for projecting light, and the light receiver is used for receiving the light projected by the light projector. The safety controller is arranged on the base and connected with the safety grating assembly. The safety controller controls the movement of the base and / or the passenger ladder according to the detection signal of the safety grating assembly. When the safety grating assembly detects that there is an object blocking, that is, the light receiver cannot receive the light projected by the light projector, the movement of the base and / or the passenger ladder is limited. When there is no object blocking on the step ladder, the light receiver can receive the light projected by the light projector, and the safety controller releases the limitation of the base and the passenger ladder, thereby preventing the passenger from being injured or the sundries from being rolled into the boarding ladder. In the present application, the inner side refers to the side facing the step ladder, that is, the side facing the passenger; and the outer side is opposite to the inner side.

[0055] Generally, the passenger ladder is arranged at one end of the base, the driver's cabin is arranged at the other end of the base, and the wheels are arranged below the base to jointly form a boarding ladder system. The wheels are used to drive the boarding ladder system to walk.

[0056] The passenger elevator of one embodiment of the present application comprises a first passenger elevator and a second passenger elevator connected by sliding to accommodate passengers of different heights to get off the cabin. The first passenger elevator and the second passenger elevator respectively comprise a step ladder and chord plates arranged on both sides of the step ladder. The step ladder of the second passenger elevator is wider than that of the first passenger elevator. The inner side of the chord plate on one side of the step ladder of the first passenger elevator and the second passenger elevator is provided with a light projector, and the inner side of the chord plate on the other side of the step ladder of the first passenger elevator and the second passenger elevator is provided with a light receiver. The outer side of the chord plate of the first passenger elevator near the light projector of the second passenger elevator is provided with a shielding sensor. The number and position of the shielding sensors on the first passenger elevator correspond to the number and position of the light projectors on the second passenger elevator. The shielding sensor is used to shield the detection signal of the corresponding safety grating assembly to the safety controller, so as to ensure that the safety grating assembly on the second passenger elevator that is folded into the first passenger elevator part stops working. The installation position of the shielding sensor closest to the second passenger elevator on the first passenger elevator ensures that the shielding sensor closest to the second passenger elevator on the first passenger elevator is not triggered by the chord plate of the second passenger elevator when the second passenger elevator is unfolded to the maximum position with the first passenger elevator.

[0057] When the second passenger elevator slides to cover the first passenger elevator, the relative relationship between the light projector and the light receiver on the first passenger elevator remains unchanged, and the light projector and the light receiver on the second passenger elevator are gradually shielded by the chord plate of the first passenger elevator as the second passenger elevator slides. During this process, the shielding sensors on the first passenger elevator are triggered by the chord plate on the second passenger elevator in turn. Each time a shielding sensor is triggered, the safety controller shields the corresponding safety grating assembly in turn, so as to avoid the safety grating assembly on the second passenger elevator from being mistakenly triggered by the chord plate of the first passenger elevator. It should be noted that each shielding sensor will always be triggered before the corresponding safety grating assembly on the second passenger elevator is shielded by the chord plate of the first passenger elevator. In the case of no passengers or obstacles, the light projector on the second passenger elevator will not be triggered to detect the signal regardless of how the second passenger elevator moves. When there are passengers or obstacles in the range where the light projector on the second passenger elevator is not shielded, the safety grating assembly on the second passenger elevator generates a trigger signal to make the safety controller take subsequent actions.

[0058] When the second passenger elevator slides to completely cover the first passenger elevator, the relative relationship between the light projector and the light receiver on the first passenger elevator remains unchanged, and all the shielding sensors on the first passenger elevator are triggered by the chord plate of the second passenger elevator. At this time, the detection signals of the light projector and the light receiver on the second passenger elevator are all shielded.

[0059] Of course, the step ladder of the first passenger elevator can also be wider than that of the second passenger elevator. In this case, the shielding sensors need to be arranged on the outer side of the chord plate of the second passenger elevator near the light projector of the first passenger elevator.

[0060] The upper end of the passenger elevator of one embodiment of the present application is horizontally provided with a platform for passengers to get off the cabin. The platform comprises a walking platform and chord plates arranged on both sides of the walking platform. The inner side of the chord plate on one side of the walking platform is provided with a light projector, and the inner side of the chord plate on the other side is provided with a light receiver. The position of the light receiver corresponds to the position of the light projector.

[0061] The platform of one embodiment of the present application comprises a fixed platform and a movable platform, the fixed platform and the movable platform respectively comprise a walking platform and a chord plate arranged on both sides of the walking platform. One end of the fixed platform is connected to the upper end of the passenger elevator, and the other end is slidingly connected to the movable platform. The walking platform of the movable platform is wider than the walking platform of the fixed platform. The inner side of the chord plate on one side of the walking platform of the fixed platform and the movable platform is provided with a light projector, and the inner side of the chord plate on the other side of the walking platform of the fixed platform and the movable platform is provided with a light receiver. The outer side of the chord plate of the fixed platform close to the light projector of the movable platform is provided with a shielding sensor, the number and position of the shielding sensors on the fixed platform correspond to the number and position of the light projectors on the movable platform, and the shielding sensors are used to shield the detection signal of the corresponding safety grating assembly to the safety controller, so as to ensure that the safety grating assembly of the fixed platform part into which the movable platform is retracted stops working. The installation position of the shielding sensor closest to the movable platform on the fixed platform ensures that the shielding sensor closest to the movable platform on the fixed platform is not triggered by the chord plate of the movable platform when the movable platform and the fixed platform are expanded to the maximum position.

[0062] When the movable platform slides to cover the fixed platform, the relative relationship between the light projector and the light receiver on the fixed platform does not change, and the light projector and the light receiver on the movable platform are gradually shielded by the chord plate of the fixed platform as the movable platform slides. During this process, the shielding sensors on the fixed platform are triggered by the chord plate on the movable platform in turn. Each time a shielding sensor is triggered, the safety controller shields the corresponding safety grating assembly in turn, thereby avoiding the safety grating assembly on the movable platform from being mistakenly triggered by the chord plate of the fixed platform. It should be noted that each shielding sensor will always be triggered before the safety grating assembly on the corresponding movable platform is shielded by the chord plate of the fixed platform. In the case of no passengers or obstacles, the light projector on the movable platform will not be triggered to detect the signal regardless of how the movable platform moves. When there are passengers or obstacles in the range where the light projector on the movable platform is not shielded, the safety grating assembly on the movable platform generates a trigger signal, causing the safety controller to perform subsequent actions.

[0063] When the movable platform slides to completely cover the fixed platform, the relative relationship between the light projector and the light receiver on the fixed platform does not change, and the shielding sensors on the fixed platform are all triggered by the chord plate of the movable platform. At this time, the detection signals of the light projector and the light receiver on the movable platform are all shielded.

[0064] Of course, the walking platform of the fixed platform can also be wider than the walking platform of the movable platform. In this case, the shielding sensors need to be arranged on the outer side of the chord plate of the movable platform close to the light projector of the fixed platform.

[0065] The outer side of the chord plate of the step ladder of the first passenger elevator is provided with a slide rail, and the inner side of the chord plate of the step ladder of the second passenger elevator is provided with a sliding block, so that the second passenger elevator is connected with the first passenger elevator through the sliding block sliding on the slide rail.

[0066] The outer side of the chord plate of the walking platform of the fixed platform is provided with a slide rail, and the inner side of the chord plate of the walking platform of the movable platform is provided with a sliding block, so that the movable platform is connected with the fixed platform through the sliding block sliding on the slide rail.

[0067] The light projector, the light receiver, the shielding sensor on the first passenger elevator and the light projector, the light receiver on the second passenger elevator are arranged along the direction parallel to the slide rail on the first passenger elevator and continuously extended to the two ends of the chord plate.

[0068] The light projector, the light receiver, the shielding sensor on the fixed platform and the light projector, the light receiver on the movable platform are arranged along the direction parallel to the slide rail on the fixed platform and continuously extended to the two ends of the chord plate.

[0069] The boarding ladder passenger protection system further comprises a walking controller and an upper controller connected with the safety controller on the base. The walking controller controls the movement of the base according to the instruction of the safety controller. The upper controller controls the movement of the passenger elevator and the platform, such as the sliding between the first passenger elevator and the second passenger elevator, the sliding of the movable platform, etc. Of course, the walking controller and the upper controller can be two independent controllers, or can be a unified hardware. The walking controller, the upper controller and the safety controller can also be integrated into one hardware.

[0070] The boarding ladder passenger protection system will be described in detail through a preferred embodiment below, referring to Figure 1 、 Figure 2 、 Figure 3 .

[0071] The embodiment includes a boarding ladder passenger protection system and a boarding ladder, the boarding ladder includes an upper part 2 and a base 3, the upper part 2 is arranged above the base 3. The upper part 2 includes a lower ladder 21, an upper ladder 22, a fixed platform 23 and a movable platform 24. The lower ladder 21 includes lower ladder steps 212 and a first chord 211, the first chord 211 is arranged on both sides of the lower ladder steps 212 respectively. The upper ladder 22 includes upper ladder steps 222 and a second chord 221, the second chord 221 is arranged on both sides of the upper ladder steps 222 respectively. The fixed platform 23 includes a first walking platform 232 and a third chord 231, the third chord 231 is arranged on both sides of the first walking platform 232 respectively. The movable platform 24 includes a second walking platform 242 and a fourth chord 241, the fourth chord 241 is arranged on both sides of the second walking platform 242 respectively. The safety grating assembly 1 is arranged inside and outside the first chord 211 and the third chord 231 and inside the second chord 221 and the fourth chord 241.

[0072] The width of the upper ladder 22 is greater than the width of the lower ladder 21, so that the distance between the second chords 221 is greater than the distance between the first chords 211. The lower ladder 21 is provided with a lower ladder slide rail 10 on the outside, the upper ladder 22 is provided with a sliding block 9 on the inside, the upper ladder 22 can slide along the lower ladder slide rail 10, and the bottom of the lower ladder 21 is connected with the base 3. The width of the movable platform 24 is greater than the width of the fixed platform 23, so that the distance between the fourth chords 241 is greater than the distance between the third chords 231. The third chord 231 is provided with a platform slide rail 8 on the outside, the fourth chord 241 is provided with a sliding block 9 on the inside, the fourth chord 241 can move along the third chord 231 through the platform slide rail 8 and the sliding block 9, one end of the fixed platform 23 is fixed on the uppermost end of the upper ladder 22, and the movable platform 24 is connected with the other end of the fixed platform 23.

[0073] The safety grating assembly 1 includes a first light projector 101, a first light receiver 102, a second light projector 103, a second light receiver 104, a third light projector 106, a third light receiver 107, a fourth light projector 108 and a fourth light receiver 109.

[0074] The first light projector 101 is installed on one side of the inside of the first chord 211, the first light receiver 102 is installed on the other side of the inside of the first chord 211, and the position corresponds to the first light projector 101. The first light projector 101 and the first light receiver 102 are arranged in parallel with the lower ladder slide rail 10 and continuously extended to both ends of the first chord 211.

[0075] The second light projector 103 is installed on one side of the inner side of the second string plate 221, and the second light receiver 104 is installed on the other side of the inner side of the second string plate 221, corresponding to the second light projector 103. A first shielding sensor 71 is also installed on one side of the outer side of the first string plate 211 (the first shielding sensor 71 is preferably installed on the outer side of the first string plate 211 on the side close to the second light projector 103). The second light projector 103, the second light receiver 104, and the first shielding sensor 71 are parallel to the down escalator slide rail 10. The second light projector and the second light receiver continuously extend to both ends of the second string plate 221, and the second light projector 103 and the second light receiver 104 are arranged in segments at intervals of a first distance. The first shielding sensor 71 is distributed at the same distance and the same number of segments as the second light projector 103.

[0076] The third light projector 106 is installed on one side of the inner side of the third string plate 231, and the third light receiver 107 is installed on the other side of the inner side of the third string plate 231, corresponding to the third light projector 106. The third light projector 106 and the third light receiver 107 are parallel to the platform escalator 8 and continuously extend to both ends of the third string plate 231.

[0077] The fourth light projector 108 is installed on one side of the inner side of the fourth string plate 241, and the fourth light receiver 109 is installed on the other side of the inner side of the fourth string plate 241, corresponding to the fourth light projector 108. A second shielding sensor 72 is also installed on one side of the outer side of the third string plate 231 (the second shielding sensor 72 is preferably installed on the outer side of the third string plate 231 on the side close to the fourth light projector 108). The fourth light projector 108, the fourth light receiver 109, and the second shielding sensor 72 are parallel to the platform escalator 8. The fourth light projector 108 and the fourth light receiver 109 continuously extend to both ends of the fourth string plate 241, and the fourth light projector 108 and the fourth light receiver 109 are arranged in segments at intervals of a first distance. The second shielding sensor 72 is distributed at the same distance and the same number of segments as the fourth light projector 108.

[0078] When the up escalator 22 is extended to the maximum position in front of the down escalator 21, the uppermost unit of the first shielding sensor 71 is not triggered by the lower edge of the second string plate 221. When the fourth string plate 241 is extended to the maximum position in front of the third string plate 231, the unit closest to the moving platform 24 of the second shielding sensor 72 is not triggered by the edge of the fourth string plate 241 closest to the fixed platform 23.

[0079] The boarding bridge passenger protection system of the embodiment further comprises a safety controller 4, the base 3 is provided with an upper controller 5 and a travelling controller 6, the upper controller is installed above the base 3, the safety controller 4 is arranged in the base 3, and the safety controller 4 is electrically connected with the safety grating assembly 1, the upper controller 5 and the travelling controller 6. The safety controller 4 receives the signal of the safety grating assembly 1 and controls the upper controller 5 and the travelling controller 6. The upper controller 5 controls the upper controller 2, such as the sliding speed of the boarding ladder and the movable platform. The travelling controller 6 controls the movement of the boarding ladder base 3.

[0080] In the working process of the boarding bridge passenger protection system, as shown in Figure 1 、 Figure 2 , in the fully expanded state of the boarding ladder, the optical axes of the first light projector 101, the second light projector 103, the third light projector 106 and the fourth light projector 108 are received by the first light receiver 102, the second light receiver 104, the third light receiver 107 and the fourth light receiver 109, and all passenger activity areas are covered and detected by the safety grating assembly 1.

[0081] When there are passengers or sundries in the down ladder 21, the up ladder 22, the fixed platform 23 and the movable platform 24, the safety grating assembly 1 detects the signal and is triggered, the safety controller 4 receives the control signal and controls the upper controller 5 and the travelling controller 6 to terminate the movement of the base 3 and the upper controller 2, so as to prevent the passengers from being injured or prevent the sundries from being rolled into the boarding ladder movement mechanism to damage the boarding ladder. After the passengers or sundries leave the down ladder 21, the up ladder 22, the fixed platform 23 and the movable platform 24, the safety grating assembly 1 loses the detection signal, and the safety controller 4 loses the signal and releases the restriction on the upper controller 5 and the travelling controller 6, so as to restore the movement of the base 3 and the upper controller 2, and the boarding ladder can continue the subsequent movement.

[0082] In the process of converting the boarding ladder from the expanded state to the contracted state, as shown in Figure 1 、 Figure 2 、 Figure 3As shown, the relative positions of the first projector 101 and the first receiver 102 remain unchanged. The second projector 103 and the second receiver 104 slide downwards with the upper ladder 22. During the sliding process, the first shielding sensor 71 is triggered sequentially from top to bottom by the second chord plate 221. Each time a first shielding sensor 71 is triggered, the safety controller 4 sequentially shields a set of second projectors 103 and second receivers 104 from bottom to top, thereby preventing the safety light curtain assembly 1 from being mistakenly triggered by the first chord plate 211. It should be noted that each first shielding sensor 71 is always triggered before its corresponding section of second projectors 103 and second receivers 104 is blocked by the first chord plate 211. In the absence of passengers or obstacles, the second receiver 104 will not trigger a detection signal regardless of how the upper ladder 22 moves. When there are passengers or obstacles within the unshielded area of ​​the second receivers 104 and second projectors 103, the second receiver 104 generates a trigger signal, causing the safety controller 4 to perform subsequent actions. The relative positions of the third projector 106 and the third receiver 107 remain unchanged. The fourth projector 108 and the fourth receiver 109 slide left and right along with the fourth chord plate 241. During the sliding process, the second shielding sensors 72 are triggered sequentially by the fourth chord plate 241 from front to back. Each time a second shielding sensor 72 is triggered, the safety controller 4 shields a set of fourth projectors 108 and fourth receivers 109 sequentially from back to front, thereby preventing the safety light curtain assembly 1 from being mistakenly triggered by the third chord plate 231. It should be noted that each second shielding sensor 72 is always triggered before its corresponding section of fourth projectors 108 and fourth receivers 109 is blocked by the third chord plate 231. In the absence of passengers or obstacles, the fourth projector 108 will not be triggered with a detection signal regardless of how the fourth chord plate 241 moves. When there are passengers or obstacles within the exposed area of ​​the fourth projector 108, the fourth projector 108 generates a trigger signal, causing the safety controller 4 to perform subsequent actions.

[0083] When the boarding stairs are in the fully retracted state, such as Figure 3 As shown, the relative positions of the first projector 101 and the first receiver 102 remain unchanged. All the first shielded sensors 71 are triggered by the second string plate 72. At this time, the detection signals of each section of the second projector 103 and the second receiver 104 are shielded. The relative positions of the third projector 106 and the third receiver 107 remain unchanged. All the second shielded sensors 72 are triggered by the fourth string plate 241. At this time, the detection signals of each section of the fourth projector 108 and the fourth receiver 109 are shielded.

[0084] As can be seen from the above embodiments, the passenger protection system of the boarding elevator of the present invention can effectively detect whether there are passengers or debris in the passenger activity area, regardless of the state of the boarding elevator (including fully deployed state, fully retracted state, half deployed state, upper structure in motion state, traveling state, etc.), thereby terminating the boarding elevator operation in a timely manner.

[0085] The application further provides a setting method of the passenger protection system of the boarding bridge.

[0086] The position of the shielding sensor closest to the second passenger elevator on the first passenger elevator or the position of the shielding sensor closest to the movable platform on the fixed platform is determined based on the sliding speed of the second passenger elevator relative to the first passenger elevator or the sliding speed of the movable platform relative to the fixed platform and the maximum sensing radius of the shielding sensor.

[0087] The maximum segment length of the light projector and the light receiver on the passenger elevator or the platform is determined based on the sliding speed of the second passenger elevator relative to the first passenger elevator or the sliding speed of the movable platform relative to the fixed platform, the maximum delay time of the safety light barrier and the maximum delay time of the safety controller.

[0088] The actual segment number and the actual segment length of the light projector and the light receiver on the passenger elevator or the platform are determined based on the maximum segment length of the light projector and the light receiver on the passenger elevator or the platform and the maximum setting length.

[0089] The installation position of the light projector and the light receiver on the passenger elevator or the platform is determined based on the actual segment number and the actual segment length of the light projector and the light receiver on the passenger elevator or the platform, and the light projector and the light receiver are arranged along the direction parallel to the sliding rail on the passenger elevator or the platform.

[0090] The position of the shielding sensor is set based on the position of the light projector.

[0091] Specifically, the calculation formula of the position of the shielding sensor closest to the second passenger elevator on the first passenger elevator or the position of the shielding sensor closest to the movable platform on the fixed platform when the shielding sensor is expanded to the maximum distance is as follows:

[0092] Lb1'=kb(b-tp1 v1);

[0093] wherein Lb1' is the distance from the sensing center point of the shielding sensor closest to the second passenger elevator on the first passenger elevator to the chord plate of the second passenger elevator or the distance from the sensing center point of the shielding sensor closest to the movable platform on the fixed platform to the chord plate of the movable platform when the shielding sensor is expanded to the maximum distance, kb is the first redundancy coefficient, and the specific value is determined according to the on-site debugging condition, b is the maximum sensing radius of the shielding sensor, tp1 is the signal delay time of the shielding sensor, and v1 is the sliding speed of the second passenger elevator relative to the first passenger elevator or the sliding speed of the movable platform relative to the fixed platform. b, tp1 and v1 can be obtained through the factory detection report of the shielding sensor or the test report of a qualified testing institution.

[0094] The calculation formula of the maximum segment length of the light projector and the light receiver on the passenger elevator or the platform is as follows:

[0095] L1' = v1 (t1-ta-tb);

[0096] Wherein, L1' is the maximum segment length of the light projector and the light receiver; t1 is the theoretical maximum acceptable time for the shielded safety grating to be exposed, the value is determined according to the size of the step ladder, which can be the ratio of the distance Ha between the two steps of the passenger elevator (Ha / v1) or the ratio of the distance between the walking platform and v1; ta is the maximum delay time of the safety grating; tb is the maximum delay time of the safety controller. ta and tb can be obtained from the factory detection report of the safety grating and the safety controller or the test report of a qualified testing organization.

[0097] The calculation formula of the actual segment number of the light projector and the light receiver on the passenger elevator or the platform is:

[0098] P' = P + 1, P = floor(Lm1' / L1'), Lm1' = Lm1 - (kc Ln1);

[0099] Wherein, P' is the actual segment number of the light projector and the light receiver; Lm1 is the maximum setting length of the light projector and the light receiver, the parameter Lm1 depends on the chord length of the passenger elevator or the platform; Lm1' represents the actual maximum setting length of the light projector and the light receiver; kc is the second redundancy coefficient, the specific value is determined according to the on-site debugging situation; Ln1 is the minimum distance from the light projector and the light receiver closest to the end of the chord to the end of the chord, to ensure that the shielding sensor is always triggered before the corresponding light projector and light receiver are blocked by the chord.

[0100] The calculation formula of the actual segment length of the light projector and the light receiver on the passenger elevator or the platform is: L1'' = Lm1' / P'.

[0101] The setting method of the passenger protection system of the boarding ladder will be described in detail below with the setting process of the passenger protection system of the boarding ladder as the preferred embodiment.

[0102] 1. First, confirm the position of the first shielding sensor, and the determination method is as follows:

[0103] 1.1, the arrangement angle of the first shielding sensor is parallel to the down ladder slide rail, and the setting position should be able to ensure that the second chord can completely trigger the first shielding sensor when the up and down ladders are completely folded;

[0104] 1.2, when the up and down ladders are completely unfolded, the distance between the first shielding sensor closest to the up ladder and the second chord is determined as follows:

[0105] 1.2.1, according to the first shielding sensor factory test report or test report of qualified testing institutions to obtain the first shielding sensor sensing center point a, the maximum sensing radius b, signal delay time tp1, see Figure 4 ;

[0106] 1.2.2, according to the signal delay time tp1 and the up-stair sliding speed v1, the formula Lb=tp1 v1 to obtain the first shielding sensor delay distance Lb;

[0107] 1.2.3, according to the system commonly used redundancy coefficient or actual situation to take redundancy coefficient kb;

[0108] 1.2.4, the calculation formula of the distance Lb1' between the sensing center point a of the uppermost first shielding sensor and the second chord plate of the up-stair expanded to the maximum distance is Lb1'=kb(b-Lb).

[0109] 2, determine the theoretical maximum segment length of the second light projector and the second light receiver, the determination method is as follows:

[0110] 2.1, first determine the up-stair sliding speed v1, then determine the theoretical maximum acceptable time t1 of the shielded safety grating exposure, and then calculate the theoretical segment length L1 according to the formula v1 t1=L1;

[0111] 2.2, because the safety grating and the safety controller have a certain delay in actual work, the maximum delay time ta of the safety grating and the maximum delay time tb of the safety controller should be taken according to the safety grating factory test report or test report of qualified testing institutions;

[0112] 2.3, calculate the actual maximum acceptable time t1' of the shielded safety grating exposure t1' =t1-(ta+tb);

[0113] 2.4, calculate the theoretical maximum segment length L1' =v1 t1'.

[0114] 3, determine the segment number and the final segment length of the second light projector and the second light receiver, the determination method is as follows:

[0115] 3.1, the second light projector and the second light receiver are parallel to the down-stair sliding rail, and one end stops at the rear end of the third light projector and the third light receiver, and the other end stops at the upper end of the first chord plate, then the maximum setting length Lm1 of the second light projector and the second light receiver can be calculated or measured;

[0116] 3.2, When the uppermost retraction is unfolded to the maximum distance, because the sensing center point a of the uppermost first shielding sensor is apart from the second chord plate by a distance Lb1', the second light projector and the second light receiver cannot be close to the upper end of the first chord plate. According to the commonly used redundancy coefficient of the system or the actual situation, the minimum distance of the second light projector and the second light receiver from the upper end of the first chord plate should be Ln1'=kc Ln1;

[0117] 3.3, The actual maximum setting length of the second light projector and the second light receiver is Lm1'=Lm1-Ln1';

[0118] 3.4, Let Lm1' / L1'=P+Q, then the number of segments of the second light projector and the second light receiver is P+1;

[0119] 3.5, The final segment length of the second light projector and the second light receiver is L1''=Lm1' / (P+1).

[0120] 4, Similarly to the above process, the position of the second shielding sensor is determined as follows:

[0121] 4.1, The arrangement angle of the second shielding sensor is parallel to the platform slide rail, and the setting position should be able to ensure that the fourth chord plate can completely trigger the second shielding sensor when the third chord plate and the fourth chord plate are completely overlapped;

[0122] 4.2, When the third chord plate and the fourth chord plate are completely unfolded, the distance of the second shielding sensor closest to the fourth chord plate from the fourth chord plate is determined as follows:

[0123] 4.2.1, According to the factory detection report of the second shielding sensor or the test report of a qualified testing institution, the sensing center point a, the maximum sensing radius c, and the signal delay time tp2 of the second shielding sensor are obtained;

[0124] 4.2.2, According to the signal delay time tp2 and the fourth platform sliding speed v2, the formula Lc=tp2 v2 is used to obtain the delay distance Lc of the second shielding sensor;

[0125] 4.2.3, According to the commonly used redundancy coefficient of the system or the actual situation, the redundancy coefficient ke is taken;

[0126] 4.2.4, The calculation formula of the distance Lc1' from the sensing center point a of the second shielding sensor closest to the movable platform to the fourth chord plate of the movable platform unfolded to the maximum distance is Lc1'=ke(b-Lb).

[0127] 5, The theoretical maximum segment length of the fourth light projector and the fourth light receiver is determined as follows:

[0128] 5.1, first determine the fourth chord plate sliding speed v2, then determine the theoretical maximum acceptable time t1 of the exposed shielded safety grating, and then calculate the theoretical segmented length L2 according to the formula v2 t1=L2;

[0129] 5.2, because the safety grating and the safety controller have a certain delay in actual work, the maximum delay time ta of the safety grating and the maximum delay time tb of the safety controller should be obtained according to the factory test report of the safety grating and the safety controller or the test report of the qualified testing agency;

[0130] 5.3, calculate the actual maximum acceptable time t2' of the exposed shielded safety grating t2' = t2-(ta+tb);

[0131] 5.4, calculate the theoretical maximum segmented length L2' = v2 t2'.

[0132] 6, determine the segmentation number and the final segmented length of the fourth light projector and the fourth light receiver, and the determination method is as follows:

[0133] 6.1, the fourth light projector and the fourth light receiver are parallel to the platform slide rail and extend to both ends of the fourth chord plate, so the maximum setting length of the fourth light projector and the fourth light receiver can be calculated or measured as Lm2;

[0134] 6.2, when the fourth chord plate contracted after being expanded to the maximum distance, because the sensing center point a of the frontmost second shielding sensor is spaced apart from the fourth chord plate by a distance Lb2', the fourth light projector and the fourth light receiver cannot be close to the rear side of the fourth chord plate, according to the system commonly used redundancy coefficient or the actual situation, the minimum distance Ln2' of the fourth light projector and the fourth light receiver from the upper end of the third chord plate is Ln2' = kf Ln2;

[0135] 6.3, the actual maximum setting length of the fourth light projector and the fourth light receiver is Lm2' = Lm2-Ln2';

[0136] 6.4, let Lm2' / L2' = G, then the segmentation number of the fourth light projector and the fourth light receiver is G+1;

[0137] 6.5, the final segmented length of the fourth light projector and the fourth light receiver is L2'' = Lm2' / (G+1).

[0138] Based on the above calculation process, the setting method of the passenger protection system of the boarding ladder according to the preferred embodiment is as follows:

[0139] S1: install the first shielding sensor: the first shielding sensor is arranged in parallel to the lower ladder slide rail outside the first chord plate, when the upper ladder and the lower ladder are fully unfolded, the center point a of the uppermost first shielding sensor is Lb1' away from the second chord plate, Lb1' is calculated by the following formula:

[0140] Lb1'=kb(b-Lb);

[0141] Lb=tp1 v1;

[0142] Wherein, v1 is the upper ladder sliding speed, tp1 is the first shielding sensor signal delay time, Lb is the first shielding sensor delay distance, b is the maximum sensing radius of the first shielding sensor, and kb is the redundancy coefficient.

[0143] S2: calculate the theoretical maximum segment length L1' of the second light projector and the second light receiver, L1' is calculated by the following formula:

[0144] L1'=v1 t1';

[0145] t1'=t1-(ta+tb);

[0146] Wherein, tb is the maximum delay time of the safety controller, ta is the maximum delay time of the safety light barrier, t1 is the theoretical maximum acceptable time of the shielded safety light barrier exposure, t1' is the actual maximum acceptable time of the shielded safety light barrier exposure, and v1 is the upper ladder sliding speed.

[0147] S3: install the second light projector and the second light receiver: the second light projector and the second light receiver are arranged in parallel to the lower ladder slide rail on the two inner sides of the second chord plate, the final segment length of the second light projector and the second light receiver is L1'', and the segment number is P', L1'' and P' are calculated by the following formula:

[0148] L1''=Lm1' / P';

[0149] P'=P+1, P is the downward integer of Lm1' / L1';

[0150] Lm1'=Lm1-Ln1';

[0151] Ln1'=kc Ln1;

[0152] Wherein, Lm1 is the maximum setting length of the second light projector and the second light receiver, kc is the redundancy coefficient, Ln1 is the minimum distance from the upper end of the first chord plate to the second light projector and the second light receiver, and Lm1' is the actual maximum setting length of the second light projector and the second light receiver.

[0153] S4: installing the second shielding sensor: the second shielding sensor is arranged in parallel to the platform slide rail outside the third chord plate, when the third chord plate is fully unfolded, the distance between the center point a of the second shielding sensor closest to the fourth chord plate and the fourth chord plate is Lb2', Lb2' is calculated by the following formula:

[0154] Lb2'=ke(b-Lc);

[0155] Lb=tp2 v2;

[0156] wherein v2 is the fourth platform sliding speed, tp2 is the second shielding sensor signal delay time, Lb is the second shielding sensor delay distance, b is the second shielding sensor maximum sensing radius, ke is the redundancy coefficient.

[0157] S5: calculating the theoretical maximum segmentation length L2' of the fourth light projector and the fourth light receiver, L2' is calculated by the following formula:

[0158] L2'=v2 t2';

[0159] t2'=t2-(ta+tb);

[0160] wherein tb is the maximum delay time of the safety controller, ta is the maximum delay time of the safety light barrier, t2 is the theoretical maximum acceptable time of the shielded safety light barrier exposure, t2' is the actual maximum acceptable time of the shielded safety light barrier exposure, v2 is the fourth platform sliding speed.

[0161] S6: installing the fourth light projector and the fourth light receiver: the fourth light projector and the fourth light receiver are arranged in parallel to the platform slide rail on the two inner sides of the fourth chord plate, the final segmentation length of the fourth light projector and the fourth light receiver is L2'', the segment number is G', L2' and G' are calculated by the following formula:

[0162] L2''=Lm2' / G';

[0163] G'=G+1, G is the downward integer of Lm2' / L2';

[0164] Lm2'=Lm2-Ln2';

[0165] Ln2'=kf Ln2;

[0166] Lm2 is the maximum setting length of the fourth light projector and the fourth light receiver, kf is the redundancy coefficient, Ln2 is the minimum distance of the fourth light projector and the fourth light receiver from the third chord plate, Lm2' is the actual maximum setting length of the fourth light projector and the fourth light receiver.

[0167] S7: install the first light projector and the first light receiver, and the first light projector and the first light receiver are arranged in parallel to the lower ladder slide rail and correspond to the two inner sides of the first chord plate.

[0168] S8: install the third light projector and the third light receiver, and the third light projector and the third light receiver are arranged in parallel to the platform slide rail and correspond to the two inner sides of the third chord plate.

[0169] It should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. Such description is only to make the description of the present application simpler and more convenient, and does not indicate or imply that the components referred to must have a particular orientation or be constructed and operated in a particular orientation.

[0170] In addition, in the present application, unless otherwise explicitly specified and limited, "connection", "arrangement" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or internal communication of two elements, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances. In addition, the terms "first", "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0171] The present application has the following beneficial effects:

[0172] 1) The present application can realize all-around monitoring of the boarding ladder passenger activity space by deploying a full-coverage safety light barrier assembly in the passenger access area, ensuring that the boarding ladder passenger protection system has no dead angle coverage.

[0173] 2) The present application realizes that the whole system can still work normally during the process of dynamic operation such as mechanism extension and contraction on the boarding ladder, neither false triggering nor detection failure occurs due to mechanism movement, and the work is reliable and the logic is simple.

[0174] 3) The present application can improve the operation efficiency through simplified logic design while ensuring the reliability of the system, effectively balancing safety and operation continuity, and providing key technical support for the intelligent upgrading of the boarding ladder.

[0175] Although the above methods are illustrated and described as a series of actions for the sake of simplicity of explanation, it should be understood and appreciated that the methods are not limited by the order of the actions, because according to one or more embodiments, some actions can occur in different orders and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but can be understood by those skilled in the art.

[0176] The constructions and arrangements of the application shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, and so on) without materially departing from the novel teachings and advantages of the subject matter described in the application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise changed, and the nature or number of elements can be modified or changed to represent alternative embodiments. Therefore, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the spirit of the application. Any "means plus function" clauses are intended to cover the structures described herein as performing the recited functions and not only structural equivalents but also equivalent structures. Other embodiments are within the scope of the following claims.

Claims

1. A passenger protection system for a boarding bridge, characterized in that The application relates to a passenger protection system of a boarding ladder, which comprises a base, a passenger ladder arranged on the base, a safety grating assembly and a safety controller. The passenger ladder comprises a first passenger ladder and a second passenger ladder which are slidably connected, and the first passenger ladder and the second passenger ladder respectively comprise a step ladder and chord plates arranged on both sides of the step ladder; the step ladder of the second passenger ladder is wider than the step ladder of the first passenger ladder. The safety grating assembly comprises a light projector and a light receiver; the light projector is arranged on the inner side of the chord plate on one side of the step ladder of the first passenger ladder and the second passenger ladder; the light receiver is arranged on the inner side of the chord plate on the other side of the step ladder of the first passenger ladder and the second passenger ladder; the position of the light receiver corresponds to the position of the light projector; the light projector is used for projecting light; and the light receiver is used for receiving the light projected by the light projector. The safety controller is arranged on the base, is connected with the safety grating assembly, controls the movement of the base and / or the passenger ladder according to the detection signal of the safety grating assembly, and limits the movement of the base and / or the passenger ladder when the safety grating assembly detects that an object is shielded. The outer side of the chord plate on the first passenger ladder near the light projector of the second passenger ladder is provided with a shielding sensor; the number and position of the shielding sensors on the first passenger ladder correspond to the number and position of the light projectors on the second passenger ladder; the shielding sensors are used for shielding the transmission of the detection signal of the corresponding safety grating assembly to the safety controller; and the installation position of the shielding sensor closest to the second passenger ladder on the first passenger ladder ensures that the shielding sensor closest to the second passenger ladder on the first passenger ladder is not triggered by the chord plate of the second passenger ladder when the second passenger ladder is unfolded to the maximum position relative to the first passenger ladder. The upper end of the passenger ladder is horizontally provided with a platform which comprises a walking platform and chord plates arranged on both sides of the walking platform.

2. The passenger protection system for boarding stairs according to claim 1, characterized in that, The inner side of the chord plate on one side of the walking platform is provided with a light projector, and the inner side of the chord plate on the other side of the walking platform is provided with a light receiver; the position of the light receiver corresponds to the position of the light projector. The platform comprises a fixed platform and a movable platform; the fixed platform and the movable platform respectively comprise a walking platform and chord plates arranged on both sides of the walking platform; one end of the fixed platform is connected with the upper end of the passenger ladder, and the other end of the fixed platform is slidably connected with the movable platform; the walking platform of the movable platform is wider than the walking platform of the fixed platform.

3. The passenger protection system for boarding stairs according to claim 2, characterized in that, The inner side of the chord plate on one side of the walking platform of the fixed platform and the movable platform is provided with a light projector; the inner side of the chord plate on the other side of the walking platform of the fixed platform and the movable platform is provided with a light receiver; the outer side of the chord plate on the fixed platform near the light projector of the movable platform is provided with a shielding sensor; the number and position of the shielding sensors on the fixed platform correspond to the number and position of the light projectors on the movable platform; the shielding sensors are used for shielding the transmission of the detection signal of the corresponding safety grating assembly to the safety controller; and the installation position of the shielding sensor closest to the movable platform on the fixed platform ensures that the shielding sensor closest to the movable platform on the fixed platform is not triggered by the chord plate of the movable platform when the movable platform is unfolded to the maximum position relative to the fixed platform.

4. The boarding ladder passenger protection system according to claim 3, wherein the outer side of the chord plate on both sides of the step ladder of the first passenger ladder is provided with a sliding rail; the inner side of the chord plate on both sides of the step ladder of the second passenger ladder is provided with a sliding block; the second passenger ladder slides on the sliding rail through the sliding block and is slidably connected with the first passenger ladder. The outer side of the chord plate on both sides of the walking platform of the fixed platform is provided with a sliding rail; the inner side of the chord plate on both sides of the walking platform of the movable platform is provided with a sliding block; the movable platform slides on the sliding rail through the sliding block and is slidably connected with the fixed platform. ​ ​ 5. The boarding ladder passenger protection system according to claim 4, wherein the light projector, the light receiver, and the shielding sensor on the first passenger ladder are arranged in a direction parallel to the slide rail on the first passenger ladder, and the light projector, the light receiver, and the shielding sensor on the second passenger ladder are arranged in a direction parallel to the slide rail on the second passenger ladder.

6. The boarding ladder passenger protection system according to claim 5, wherein the light projector, the light receiver, and the shielding sensor on the fixed platform are arranged in a direction parallel to the slide rail on the fixed platform, and the light projector, the light receiver, and the shielding sensor on the movable platform are arranged in a direction parallel to the slide rail on the movable platform.

7. The boarding ladder passenger protection system according to claim 6, further comprising a walking controller and an upper controller connected to the safety controller on the base.

6. The passenger protection system for boarding stairs according to claim 3, characterized by 8. The boarding ladder passenger protection system according to claim 7, wherein the walking controller controls the movement of the base according to the instructions of the safety controller.

9. The boarding ladder passenger protection system according to claim 8, wherein the upper controller controls the movement of the passenger ladder and the platform according to the instructions of the safety controller.

10. The setting method of the boarding ladder passenger protection system according to claim 7, comprising the following steps:

7. A method of installing a passenger protection system for a boarding bridge according to claim 1, characterized in that 11. Determining the position of the shielding sensor closest to the second passenger ladder on the first passenger ladder or the position of the shielding sensor closest to the movable platform on the fixed platform based on the sliding speed of the second passenger ladder relative to the first passenger ladder or the sliding speed of the movable platform relative to the fixed platform and the maximum sensing radius of the shielding sensor when the second passenger ladder is fully extended.

12. Determining the maximum segment length of the light projector and the light receiver on the passenger ladder or the platform based on the sliding speed of the second passenger ladder relative to the first passenger ladder or the sliding speed of the movable platform relative to the fixed platform, the maximum delay time of the safety light barrier, and the maximum delay time of the safety controller.

13. Determining the actual segment number and the actual segment length of the light projector and the light receiver on the passenger ladder or the platform based on the maximum segment length and the maximum setting length of the light projector and the light receiver on the passenger ladder or the platform.

14. Determining the installation position of the light projector and the light receiver on the passenger ladder or the platform based on the actual segment number and the actual segment length of the light projector and the light receiver on the passenger ladder or the platform.

15. Correspondingly setting the position of the shielding sensor based on the position of the light projector.

16. The setting method of the boarding ladder passenger protection system according to claim 7, wherein the calculation formula of the position of the shielding sensor closest to the second passenger ladder on the first passenger ladder or the position of the shielding sensor closest to the movable platform on the fixed platform when the second passenger ladder is fully extended is as follows: wherein Lb1’ is the distance from the sensing center point of the shielding sensor closest to the second passenger ladder on the first passenger ladder to the chord plate of the second passenger ladder or the distance from the sensing center point of the shielding sensor closest to the movable platform on the fixed platform to the chord plate of the movable platform when the second passenger ladder is fully extended, kb is the first redundancy coefficient, b is the maximum sensing radius of the shielding sensor, tp1 is the signal delay time of the shielding sensor, and v1 is the sliding speed of the second passenger ladder relative to the first passenger ladder or the sliding speed of the movable platform relative to the fixed platform.

17. The setting method of the boarding ladder passenger protection system according to claim 8, wherein the calculation formula of the maximum segment length of the light projector and the light receiver on the passenger ladder or the platform is as follows: Lb1' = kb(b - tp1 v1); wherein L1’ is the maximum segment length of the light projector and the light receiver, t1 is the theoretical maximum acceptable time for the exposed safety light barrier to be shielded, ta is the maximum delay time of the safety light barrier, and tb is the maximum delay time of the safety controller.

18. The setting method of the boarding ladder passenger protection system according to claim 8, wherein the calculation formula of the actual segment number of the light projector and the light receiver on the passenger ladder or the platform is as follows: ​ L1' = v1 (t1-ta-tb); ​ ​ P' = P + 1, P = floor(Lm1' / L1'), Lm1' = Lm1- (kc Ln1) Wherein, P' is the actual segment number of the light projector and the light receiver, Lm1 is the maximum setting length of the light projector and the light receiver, Lm1' represents the actual maximum setting length of the light projector and the light receiver, kc is the second redundancy coefficient, Ln1 is the minimum distance from the light projector and the light receiver closest to the end of the chord plate to the end of the chord plate; The calculation formula of the actual segment length of the light projector and the light receiver on the guest elevator or platform is: L1''=Lm1' / P'.

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