Boarding bridge control circuit, control method, control device and boarding bridge

Abstract

The present disclosure provides a boarding bridge control circuit, a control method, a control device and a boarding bridge, which are used to solve the problem that the boarding bridge safety boot system occasionally has a descent control duration exceeding the specified maximum time, resulting in damage to the aircraft cabin door. The boarding bridge control circuit is used to control the movement of the boarding bridge when the boarding bridge safety boot is triggered, and includes: a safety boot monitoring module for detecting the action signal of the safety boot; a time control module including a time limit switch for generating a descent start signal upon receiving the action signal, and continuously generating a descent stop signal to keep the boarding bridge from descending when the boarding bridge continues to descend for more than a preset time; a descent control module for controlling the descent of the boarding bridge according to the descent start signal, and controlling the boarding bridge to stop descending according to the descent stop signal. The embodiment of the present disclosure avoids the problem that the descent control duration of the boarding bridge exceeds the specified maximum time, resulting in damage to the aircraft cabin door.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boarding bridges, and in particular to a boarding bridge control circuit, a control method, a control device, and a boarding bridge. Background Art

[0002] The boarding bridge safety boot system is an important part of the leveling system and is the main protection system for the aircraft cabin door (i.e., the plane door). During the boarding bridge pick-up process, the safety boot is located under the aircraft cabin door. When the aircraft cabin door triggers the safety boot to move, the safety boot action signal is transmitted to the boarding bridge control system. The boarding bridge control system controls the boarding bridge to descend urgently, allowing the boarding bridge to quickly separate from the aircraft cabin door to prevent the cabin door from touching the boarding bridge and causing damage.

[0003] Existing aerobridge safety shoe systems occasionally have a problem where the descent control duration exceeds the specified maximum time, causing the aerobridge canopy to scrape against the top of the aircraft door, thereby damaging the aircraft door.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0005] The present disclosure provides a boarding bridge control circuit, a control method, a control device and a boarding bridge, which at least to some extent overcome the problem in the related art that the descent control duration of the boarding bridge safety boot system exceeds the specified maximum time, resulting in damage to the aircraft cabin door.

[0006] According to a first aspect of the present disclosure, a boarding bridge control circuit is provided for controlling the movement of the boarding bridge when the boarding bridge safety boots are triggered, comprising:

[0007] A safety boot monitoring module, configured to detect an action signal of the safety boot;

[0008] a time control module, the time control module including a time limit switch, the time limit switch being configured to generate a descent start signal and a descent stop signal, the time limit switch generating the descent start signal upon receiving the action signal, and continuously generating the descent stop signal to stop the descent of the boarding bridge when the boarding bridge continues to descend for more than a preset time period;

[0009] The descent control module is used to control the descent of the boarding bridge according to the descent start signal, and is also used to control the boarding bridge to stop descending according to the descent stop signal.

[0010] Optionally, the time limit switch includes a first time relay or a second time relay, the first time relay is used to generate a first descent start signal and continuously generate a first descent stop signal when the boarding bridge uses its lifting oil pump motor to perform descent, and the second time relay is used to generate a second descent start signal and continuously generate a second descent stop signal when the boarding bridge uses its own weight to settle.

[0011] Optionally, it also includes: a power circuit monitoring module, coupled with the power circuit of the lifting oil pump motor of the boarding bridge, for monitoring the power circuit of the lifting oil pump motor; the descent control module includes an emergency rapid descent module and an emergency descent module; the time limit switch includes a first time relay and a second time relay, the first time relay is used to generate a first descent start signal and continuously generate a first descent stop signal, the emergency rapid descent module is used to control the descent of the boarding bridge according to the first descent start signal and control the boarding bridge to stop descending according to the first descent stop signal; the second time relay is used to generate a second descent start signal and continuously generate a second descent stop signal, the emergency descent module is used to control the boarding bridge according to the second descent start signal descend and control the boarding bridge to stop descending according to the second descent stop signal; when the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is normal, the first time relay generates the first descent start signal when receiving the action signal, and the first time relay continues to generate the first descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the first preset time length; when the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is faulty, the second time relay generates the second descent start signal when receiving the action signal, and the second time relay continues to generate the second descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the second preset time length.

[0012] Optionally, the power circuit monitoring module includes a first relay and / or a second relay and / or a third relay and a fourth relay, and the first relay and / or the second relay and / or the third relay are connected to the fourth relay to control the power supply or power loss of the coil of the fourth relay, and the fourth relay includes a first group of normally closed contacts and a second group of normally open contacts; when the power circuit of the lifting oil pump motor of the boarding bridge fails, at least one of the first relay, the second relay and the third relay is connected to energize the coil of the fourth relay, the first group of contacts of the fourth relay is disconnected, so that the first time relay cannot receive the action signal, and the second group of contacts of the fourth relay is connected so that the second time relay receives the action signal.

[0013] Optionally, the first relay is triggered by a tripping signal of a power circuit protection circuit breaker of the lifting oil pump motor of the boarding bridge; and / or, the second relay is triggered by a power failure signal of the power supply to the lifting oil pump motor of the boarding bridge; and / or, the third relay is triggered by a three-phase imbalance signal of the power supply to the lifting oil pump motor of the boarding bridge.

[0014] Optionally, the time control module further includes a fifth relay and a sixth relay, the fifth relay including a coil, a first set of normally open contacts, and a second set of normally open contacts, the coil of the fifth relay being energized after the first time relay generates the first descent start signal, and the first set of contacts and the second set of contacts of the fifth relay being connected, so that the emergency rapid descent module receives the first descent start signal;

[0015] The sixth relay includes a coil, a first group of normally closed contacts and a second group of normally open contacts. The coil of the sixth relay is energized after the first time relay generates the first descent stop signal. The first group of contacts of the sixth relay is disconnected, so that the emergency rapid descent module receives the first descent stop signal. The second group of contacts of the sixth relay is connected, so that the first time relay continues to generate the first descent stop signal.

[0016] Optionally, the time control module also includes: a seventh relay and an eighth relay, the seventh relay including a first group of normally open contacts and a coil, the coil of the seventh relay being energized after the second time relay generates the second descent start signal, the first group of contacts of the seventh relay being closed, so that the emergency descent module receives the second descent start signal; the eighth relay including a first group of normally closed contacts, a second group of normally open contacts and a coil, the coil of the eighth relay being energized after the second time relay generates the second descent stop signal, the first group of contacts of the eighth relay being disconnected, so that the emergency descent module receives the second descent stop signal, the second group of contacts of the eighth relay being closed, so that the second time relay continues to generate the second descent stop signal.

[0017] Optionally, it also includes a PLC control signal receiving module, which is used to receive a control stop signal generated by the PLC control module of the boarding bridge control system, and the descent control module is also used to control and keep the boarding bridge from descending according to the control stop signal; and / or it also includes a PLC fault monitoring module, when the PLC fault monitoring module detects a fault in the PLC control module of the boarding bridge control system, the time limit switch generates a descent start signal of the preset duration according to the received action signal, and after the descent control module controls the boarding bridge to perform descent control for the preset duration according to the descent start signal of the preset duration, the time limit switch continues to generate a descent stop signal.

[0018] Optionally, the time limit switch is a time relay, which includes a first group of contacts and a second group of contacts. The time relay is used to make the first group of contacts of the time relay instantly connected to generate the descent start signal when receiving the action signal, and the second group of contacts of the time relay is connected to continuously generate the descent stop signal when the continuous descent time of the boarding bridge exceeds the preset time length.

[0019] According to a second aspect of the present disclosure, a boarding bridge control method is provided, which is applied to the boarding bridge control circuit described in the first aspect, and the method includes: a safety shoe monitoring module obtains an action signal; a time limit switch generates a descent start signal according to the action signal; a descent control module controls the descent of the boarding bridge according to the descent start signal; when the continuous descent time of the boarding bridge exceeds a preset time length, the time limit switch generates a descent stop signal; the descent control module controls the boarding bridge to stop descending according to the descent stop signal; the time limit switch continuously generates the descent stop signal to keep the boarding bridge from descending.

[0020] Optionally, the method also includes: when the number of descents or the descent height exceeds a threshold, the PLC control signal receiving module receives a control stop signal generated by the PLC control module of the boarding bridge control system; the descent control module controls and keeps the boarding bridge from descending according to the control stop signal.

[0021] According to a third aspect of the present disclosure, a boarding bridge control device is provided, comprising: a memory and a processor; the memory is used to store program code; the processor is used to call the program code to execute the boarding bridge control method described in the second aspect.

[0022] According to a fourth aspect of the present disclosure, there is provided a boarding bridge comprising the boarding bridge control circuit according to the first aspect.

[0023] In the control circuit of the boarding bridge of the embodiment of the present invention, the time limit switch generates a descent start signal after receiving the action signal of the safety boots, and the descent control module controls the descent of the boarding bridge according to the descent start signal. When the continuous descent time of the boarding bridge exceeds the preset time, the time limit switch continuously generates a descent stop signal, and the descent control module controls the boarding bridge to stop descending according to the descent stop signal. Since the time limit switch continuously generates the descent stop signal, the boarding bridge is kept stopped, thereby realizing the monitoring of the continuous descent time of the boarding bridge, avoiding the problem that the descent control duration of the boarding bridge exceeds the specified maximum time, resulting in damage to the aircraft cabin door.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0026] Figure 1 is a schematic diagram of a boarding bridge control circuit according to an exemplary embodiment of the present disclosure;

[0027] Figure 2 is a schematic diagram of a boarding bridge control circuit according to an exemplary embodiment of the present disclosure;

[0028] Figure 3 is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure;

[0029] Figure 4 is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure;

[0030] Figure 5 is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure;

[0031] Figure 6 is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure;

[0032] Figure 7 is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure;

[0033] Figure 8 The figure is a flow chart of a method for controlling an aerobridge according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices. In the present disclosure, normally closed - NC (normal close) is usually in a closed state, that is, closed when the coil is not energized; normally open contact: a contact in an open state under normal circumstances, that is, open when the coil is not energized. It is worth noting that "exceeding" in the entire disclosure includes the threshold value, which is equivalent to the meaning of "greater than or equal to".

[0036] An exemplary embodiment of the present disclosure shows a boarding bridge control circuit for controlling the movement of the boarding bridge when the boarding bridge safety shoe is triggered. Figure 1 The schematic diagram of the circuit is shown as an example. Figure 1 As shown, the boarding bridge control circuit includes:

[0037] A safety boot monitoring module 12 is used to detect the action signal of the safety boot;

[0038] a time control module 14, the time control module including a time limit switch, the time limit switch being used to generate a descent start signal and a descent stop signal. The time limit switch generates the descent start signal upon receiving the action signal, and continuously generates the descent stop signal to stop the descent of the boarding bridge when the boarding bridge continues to descend for more than a preset time period;

[0039] The descent control module 16 is used to control the descent of the boarding bridge according to the descent start signal, and is also used to control the boarding bridge to stop descent according to the descent stop signal.

[0040] In the control circuit of the boarding bridge of the embodiment of the present invention, the time limit switch generates a descent start signal after receiving the action signal of the safety boots, and the descent control module controls the descent of the boarding bridge according to the descent start signal. When the continuous descent time of the boarding bridge exceeds the preset time, the time limit switch continuously generates a descent stop signal, and the descent control module controls the boarding bridge to stop descending according to the descent stop signal. Since the time control module continuously generates the descent stop signal, the boarding bridge is kept stopped from descending, thereby realizing the monitoring of the continuous descent time of the boarding bridge, avoiding the problem that the descent control duration of the boarding bridge exceeds the specified maximum time, resulting in damage to the aircraft cabin door.

[0041] In some preferred embodiments, the time limit switch includes a first time relay or a second time relay, the first time relay is used to generate a first descent start signal and continuously generate a first descent stop signal when the boarding bridge uses its lifting oil pump motor to perform descent, and the second time relay is used to generate a second descent start signal and continuously generate a second descent stop signal when the boarding bridge uses its own weight to settle.

[0042] Figure 2 is a schematic diagram of a boarding bridge control circuit according to an exemplary embodiment of the present disclosure, as shown in FIG. Figure 2 As shown, the boarding bridge control circuit includes:

[0043] Safety shoe action intermediate relay KC35 is used to connect in response to the triggering of safety shoes;

[0044] The safety boot actuation intermediate relay KC35 is a specific implementation of the safety boot monitoring module. When the aircraft cabin door squeezes the safety boot and outputs the safety boot actuation signal, the safety boot actuation intermediate relay KC35 detects the safety boot actuation signal and the normally open contacts (21, 24) of the safety boot actuation intermediate relay KC35 are connected to transmit the actuation signal to the time control module.

[0045] Time relays (e.g. may include Figure 2 The time relay KT5 and / or time relay KT4 shown in the figure comprises: a first set of contacts, a second set of contacts, and a coil. The time relay is used to respond to the connection of the safety boot actuation intermediate relay KC35, causing the first set of contacts of the time relay to connect immediately to allow the boarding bridge to descend, and the second set of contacts of the time relay to connect after a preset time period to stop the boarding bridge from descending. After the second set of contacts of the time relay is connected, the coil of the time relay remains energized to prevent the boarding bridge from descending again. The first set of contacts of the time relay connects immediately after the coil of the time relay is energized, and the second set of contacts of the time relay are the delayed action contacts of the time relay. The second set of contacts will not connect until the coil of the time relay is energized for a set time (such as a preset time period).

[0046] A time relay is a specific implementation of a time limit switch. In other implementations, it may be another device or component that can achieve the same function and effect. Upon receiving the action signal, the time relay immediately connects its first set of contacts to generate the descent start signal. Furthermore, if the boarding bridge continues to descend for a predetermined period of time, the second set of contacts of the time relay connects to continuously generate the descent stop signal.

[0047] In an embodiment of the present disclosure, the descent of the boarding bridge may include an emergency rapid descent of the boarding bridge and an emergency descent of the boarding bridge, wherein the emergency rapid descent of the boarding bridge refers to the boarding bridge being in the automatic leveling mode, when the safety boots are activated, and the lifting oil pump motor of the boarding bridge is able to operate normally, and the boarding bridge is in an emergency rapid descent at a relatively fast speed; the emergency descent of the boarding bridge refers to the boarding bridge being in the automatic leveling mode, when the safety boots are activated, and the lifting oil pump motor of the boarding bridge is unable to operate normally, and the boarding bridge can only rely on its own gravity to achieve an emergency descent. In an embodiment of the present disclosure, the control of the emergency descent of the boarding bridge can be achieved by controlling the opening and closing of the hydraulic rapid descent valve, and the control of the emergency descent of the boarding bridge can be achieved by controlling the opening and closing of the hydraulic deadweight settlement valve. The specific control process will be gradually explained later.

[0048] In the boarding bridge control circuit of the embodiment of the present disclosure, the safety shoe actuation intermediate relay is triggered to turn on by the safety shoe actuation. In response to the turning on of the safety shoe actuation intermediate relay, the first set of contacts of the time relay are immediately turned on, causing the boarding bridge to descend. The second set of contacts of the time relay are turned on after a preset time delay, causing the boarding bridge to stop descending. After the second set of contacts are turned on, the coil of the time relay remains energized, preventing the boarding bridge from descending again. The boarding bridge control circuit of the embodiment of the present disclosure allows the boarding bridge's descent duration to be controlled according to the preset time of the time relay. Based on this, even if the PLC control module of the boarding bridge control system fails, the boarding bridge's descent duration can be controlled by the boarding bridge control circuit of the embodiment of the present disclosure, which can effectively avoid safety issues caused by the failure of the PLC control module and improve system safety.

[0049] In an embodiment of the present disclosure, the boarding bridge control circuit may further include:

[0050] The power circuit monitoring module is coupled to the power circuit of the lifting oil pump motor of the boarding bridge and is used to monitor the power circuit of the lifting oil pump motor.

[0051] The descent control module includes an emergency rapid descent module and an emergency descent module. The emergency rapid descent module is used to control the boarding bridge to descend using its lifting oil pump motor, and the emergency descent module is used to control the boarding bridge to settle using its own weight.

[0052] The time limit switch includes a first time relay KT5 and a second time relay KT4. The first time relay KT5 is used to control the opening and closing of the hydraulic rapid descent valve, while the second time relay KT4 is used to control the opening and closing of the hydraulic deadweight settlement valve. The hydraulic rapid descent valve is part of the emergency rapid descent module, while the hydraulic deadweight settlement valve is part of the emergency descent module. The first time relay KT5 is used to generate a first descent start signal and continuously generate a first descent stop signal. The emergency rapid descent module controls the descent of the boarding bridge based on the first descent start signal and stops the descent of the boarding bridge based on the first descent stop signal. The second time relay KT4 is used to generate a second descent start signal and continuously generate a second descent stop signal. The emergency descent module controls the descent of the boarding bridge based on the second descent start signal and stops the descent of the boarding bridge based on the second descent stop signal.

[0053] When the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is normal, the safety shoe action intermediate relay KC35 is connected with the first time relay KT5, and the first time relay KT5 generates the first descent start signal when receiving the action signal. The first time relay KT5 continues to generate the first descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the first preset time length; when the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is faulty, the safety shoe action intermediate relay KC35 is connected with the second time relay KT4, and the second time relay KT4 generates the second descent start signal when receiving the action signal. The second time relay KT4 continues to generate the second descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the second preset time length.

[0054] The safety shoe actuating intermediate relay KC35 is connected to the first time relay KT5, which can be achieved by closing the contacts of the safety shoe actuating intermediate relay, thereby energizing the coil of the first time relay KT5. The safety shoe actuating intermediate relay KC35 is connected to the second time relay KT4, which can be achieved by closing the contacts of the safety shoe actuating intermediate relay, thereby energizing the coil of the second time relay KT4.

[0055] In an exemplary embodiment, a certain relay A can be used to control the connection between the safety shoe actuation intermediate relay KC35 and the coil of the first time relay KT5 or the coil of the second time relay KT4. The coil of relay A can be connected to the output end of the power supply circuit monitoring module. When the power supply circuit monitoring module detects that the power supply circuit of the lifting oil pump motor of the boarding bridge is normal, the coil of control relay A is de-energized. When the power supply circuit monitoring module detects that the power supply circuit of the lifting oil pump motor of the boarding bridge is faulty, the coil of control relay A is energized. The relay A can include at least one group of normally open contacts and one group of normally closed contacts, wherein one group of normally closed contacts is disconnected after the coil of relay A is energized, thereby disconnecting the safety shoe actuation intermediate relay KC35 from the coil of the first time relay KT5, and one group of normally open contacts is connected after the coil of relay A is energized, so that the safety shoe actuation intermediate relay KC35 is connected to the coil of the second time relay KT4.

[0056] In the embodiment of the present disclosure, Figure 2 Taking the boarding bridge control circuit shown as an example, the power supply circuit monitoring module may include a first relay KC81, a second relay KC111, a third relay KC112 and a fourth relay KC265. The first relay KC81, the second relay KC111 and the third relay KC112 are arranged in parallel and are all connected to the fourth relay KC265 to control the power supply or power loss of the coil of the fourth relay KC265. The fourth relay KC265 includes a first group of normally closed contacts (21, 22) and a second group of normally open contacts (31, 34); wherein the fourth relay KC265 may be an example of the above-mentioned relay A, its first group of contacts (21, 22) is an example of the normally closed contacts of relay A, and its second group of contacts (31, 34) is an example of the normally open contacts of relay A.

[0057] When the power supply circuit of the lifting oil pump motor of the boarding bridge fails, at least one of the first relay KC81, the second relay KC111 and the third relay KC112 is connected, controlling the coil of the fourth relay KC265 to be energized, and the first group of contacts (21, 22) of the fourth relay KC265 is disconnected, so that the connection between the first time relay KT5 and the safety shoe action intermediate relay KC35 is disconnected, so that the first time relay KT5 cannot receive the action signal; the second group of contacts (31, 34) of the fourth relay KC265 is connected, so that the second time relay KT4 is connected to the safety shoe action intermediate relay KC35, so that the second time relay KT4 receives the action signal.

[0058] In the embodiment of the present disclosure, the power supply circuit failure of the lifting oil pump motor of the boarding bridge may include the power supply of the lifting oil pump motor being cut off. The power supply of the lifting oil pump motor may be caused by the tripping of the power supply circuit protection circuit breaker due to motor failure or overload of the oil pump motor; power failure of the power supply or three-phase imbalance; Based on this, in order to detect various fault conditions of the lifting oil pump motor, the first relay KC81 in the boarding bridge control circuit of the embodiment of the present disclosure is triggered by the power supply circuit protection circuit breaker tripping signal of the lifting oil pump motor of the boarding bridge, so The coil of the first relay KC81 loses power, causing the normally closed contacts (11, 12) to close; and / or, the second relay KC111 is triggered by a power-off signal of the lifting oil pump motor power supply of the boarding bridge, and the coil of the second relay KC111 loses power, causing the normally closed contacts (31, 32) to close; and / or, the third relay KC112 is triggered by a three-phase unbalanced signal of the lifting oil pump motor power supply of the boarding bridge, and the coil of the third relay KC112 loses power, causing the normally closed contacts (31, 32) to close.

[0059] exist Figure 2 In the example, the contacts (11, 12) of the first relay KC81, the contacts (31, 32) of the second relay KC111, the contacts (31, 32) of the third relay KC112, and the first group of contacts (21, 22) of the fourth relay KC265 are all normally closed contacts. When the power supply of the oil pump motor is normal, the normally closed contacts (11, 12) of the first relay KC81, the normally closed contacts (31, 32) of the second relay KC111, and The normally closed contacts (31, 32) of the third relay KC112 are both disconnected, causing the coil of the fourth relay KC265 to lose power. When the power circuit of the oil pump motor is de-energized due to the above reasons, any one of the normally closed contacts (11, 12) of the first relay KC81, the normally closed contacts (31, 32) of the second relay KC111, and the normally closed contacts (31, 32) of the third relay KC112 is closed, and the coil of the fourth relay KC265 is energized.

[0060] In the embodiment of the present disclosure, Figure 2Taking the boarding bridge control circuit shown as an example, the time control module in the boarding bridge control circuit also includes a fifth relay KC262 and a sixth relay KC261, the fifth relay KC262 including a coil, a first group of contacts (21, 24) and a second group of contacts (11, 14), wherein the first group of contacts (21, 24) and the second group of contacts (11, 14) of the fifth relay KC262 are both normally open contacts, the coil of the fifth relay KC262 is energized after the first group of contacts (24, 25) of the first time relay KT5 is closed, that is, the coil of the fifth relay KC262 is energized after the first time relay KT5 generates the first descent start signal, the first group of contacts (21, 24) and the second group of contacts (11, 14) of the fifth relay KC262 are connected, so that the emergency rapid descent module receives the first descent start signal, the hydraulic rapid descent valve is opened, and the lifting oil pump motor of the boarding bridge is operated;

[0061] The first group of contacts (21, 24) of the fifth relay KC262 is connected to directly or indirectly trigger the opening of the hydraulic quick-descent valve, and the second group of contacts (11, 14) of the fifth relay KC262 is connected to directly or indirectly trigger the operation of the lifting oil pump motor of the boarding bridge, wherein direct triggering refers to directly triggering the operation of the equipment through the conduction of the relay contacts, and indirect triggering refers to energizing the coil of another relay used to control the operation of the equipment through the conduction of the relay contacts, thereby causing the equipment to operate.

[0062] The sixth relay KC261 includes a coil, a first group of normally closed contacts (11, 12) and a second group of normally open contacts (21, 24). The coil of the sixth relay KC261 is energized after the second group of contacts (15, 18) of the first time relay KT5 is connected, that is, the coil of the sixth relay KC261 is energized after the first time relay KT5 generates the first descent stop signal. The first group of contacts (11, 12) of the sixth relay KC261 is disconnected so that the emergency rapid descent module receives the first descent stop signal, and the hydraulic rapid descent valve switches from open to closed. The second group of contacts (21, 24) of the sixth relay KC261 is connected so that the coil of the first time relay KT5 remains energized, and the first time relay KT5 continues to generate the first descent stop signal.

[0063] In this embodiment, if the duration of the action signal of the safety boot is less than the first preset time length set by the first time relay KT5, then when the action signal of the safety boot stops, the coil of the first time relay KT5 loses power, the first group of contacts (24, 25) of the first time relay KT5 is disconnected, the coil of the fifth relay KC262 loses power, and the boarding bridge stops descending. If the duration of the action signal of the safety boot is not less than the first preset time length set by the first time relay KT5, the delayed action contact of the first time relay KT5, i.e., the second group of contacts (15, 18), can be closed within the duration of the safety boot trigger signal, so that the coil of the sixth relay KC261 is energized, the first group of contacts (11, 12) is disconnected, the boarding bridge stops descending, the second group of contacts (21, 24) is closed, and the coil of the first time relay KT5 remains energized under the control of the second group of contacts (21, 24) of the sixth relay KC261. Even if the safety boot is triggered again, the boarding bridge will not descend again.

[0064] In an embodiment of the present disclosure, the time control module of the boarding bridge control circuit may further include:

[0065] The seventh relay KC276 and the eighth relay KC275, the seventh relay KC276 includes a first group of normally open contacts (21, 24) and a coil, the coil of the seventh relay KC276 is energized after the first group of contacts (24, 25) of the second time relay KT4 is closed, the first group of contacts (21, 24) of the seventh relay KC276 is closed, so that the emergency descent module receives the second descent start signal and the hydraulic deadweight settlement valve is opened.

[0066] The eighth relay KC275 includes a first group of normally closed contacts (11, 12), a second group of normally open contacts (21, 24) and a coil. The coil of the eighth relay KC275 is energized after the second group of contacts (15, 18) of the second time relay KT4 is connected, that is, the coil of the eighth relay KC275 is energized after the second time relay KT4 generates the second descent stop signal. The first group of contacts (11, 12) of the eighth relay KC275 is disconnected, so that the emergency descent module receives the second descent stop signal, and the hydraulic self The heavy settling valve closes and / or disconnects the safety shoe actuating intermediate relay KC35 from controlling the descent of the boarding bridge, and the second group of contacts (21, 24) of the eighth relay KC275 are closed to keep the coil of the second time relay KT4 energized, so that the second time relay KT4 continuously generates the second descent stop signal. After the first group of contacts (11, 12) of the eighth relay KC275 is disconnected, even if the power supply circuit of the oil pump motor returns to normal, the boarding bridge cannot be lowered due to the triggering of the safety shoe, and even if the safety shoe is triggered again, the boarding bridge will not descend again.

[0067] In an embodiment of the present disclosure, the boarding bridge control circuit may further include a ninth relay KC55, configured to be opened and closed by the PLC control module of the boarding bridge control system. The ninth relay KC55 is coupled to the input of the boarding bridge control circuit. The ninth relay KC55 is a specific implementation of a PLC control signal receiving module, configured to receive a control stop signal generated by the PLC control module of the boarding bridge control system. The PLC control module of the boarding bridge control system is prior art and will not be described in detail here. The descent control module is further configured to control and maintain the boarding bridge's descent in response to the control stop signal. In this embodiment, the ninth relay KC55 is coupled to the inputs of the hydraulic quick-descent valve and the hydraulic deadweight settlement valve. This allows the PLC control module to control the hydraulic quick-descent valve or the hydraulic deadweight settlement valve to control the boarding bridge's descent when the PLC control module is operating normally.

[0068] Still Figure 2 Taking the boarding bridge control circuit shown as an example, the contacts (21, 22) of the ninth relay KC55 can be normally closed contacts. The ninth relay KC55 is controlled by the PLC control module of the boarding bridge control system. When the logic judgment set by the PLC control module does not allow the safety boots to control the boarding bridge to descend, the PLC control module controls the coil of the ninth relay KC55 to be energized, and the normally closed contacts (21, 22) of the ninth relay KC55 are disconnected, disconnecting the connection between the safety boots actuating intermediate relay KC35 and the hydraulic quick-descent valve and the hydraulic deadweight settlement valve, thereby stopping the boarding bridge from descending and no longer being controlled to descend by the safety boots.

[0069] Through the control of the ninth relay KC55 by the PLC control module, the boarding bridge control circuit can mainly rely on the hardware design to control the descent of the boarding bridge, and the PLC control module plays an auxiliary role. Under special circumstances, the descent of the boarding bridge can also be controlled by relying solely on the hardware system. It can also be said that the boarding bridge control circuit of the embodiment of the present invention includes two sets of redundant emergency descent control methods, one set is jointly controlled by the hardware and PLC control module logic control, and the other set is independently controlled by the hardware. Therefore, the boarding bridge control circuit of the embodiment of the present invention can improve the reliability and stability of the boarding bridge descent control.

[0070] In an embodiment of the present disclosure, the boarding bridge control circuit may further include a tenth relay KC83, including contacts (11, 12), which are triggered by a fault signal from the PLC control module to close the contacts (11, 12). The tenth relay KC83 is a specific implementation of the PLC fault monitoring module. When the PLC fault monitoring module detects a fault in the PLC control module of the boarding bridge control system, the time limit switch generates a descent start signal of a preset duration according to the received action signal. After the descent control module controls the boarding bridge to perform descent control for a preset duration according to the descent start signal of the preset duration, the time limit switch continuously generates a descent stop signal.

[0071] Still Figure 2 Taking the illustrated boarding bridge control circuit as an example, the tenth relay KC83 may be provided as a relay with a normally closed contact. When the PLC control module fails, the normally closed contacts (11, 12) of the tenth relay KC83 are closed, and when the first group of contacts (24, 25) of the first time relay KT5 is closed, the coil of the fifth relay KC262 is energized, and the third group of contacts (31, 34) of the fifth relay KC262 is closed, so that the coil of the first time relay KT5 remains energized; wherein, the third group of contacts (31, 34) of the fifth relay KC262 is a normally open contact; when the normally closed contacts (11, 12) of the tenth relay KC83 are closed, and the first group of contacts (24, 25) of the second time relay KT4 is closed, the coil of the seventh relay KC276 is energized, and the second group of contacts (31, 34) of the seventh relay KC276 is closed, so that the coil of the second time relay KT4 remains energized, wherein, the second group of contacts (31, 34) of the seventh relay KC276 is a normally open contact. In this embodiment, the coil of the first time relay KT5 remains energized under the control of the normally closed contacts (11, 12) of the tenth relay KC83 and the third group of contacts (31, 34) of the fifth relay KC262; the coil of the second time relay KT4 remains energized under the control of the normally closed contacts (11, 12) of the tenth relay KC83 and the second group of contacts (31, 34) of the seventh relay KC276.

[0072] In an embodiment of the present disclosure, the emergency rapid descent module further includes a hydraulic rapid descent valve control relay, the hydraulic rapid descent valve control relay including a coil coupled to the input of the hydraulic rapid descent valve. When energized, the coil of the hydraulic rapid descent valve control relay controls the hydraulic rapid descent valve to open, and when de-energized, controls the hydraulic rapid descent valve to close. The hydraulic rapid descent valve control relay includes a first hydraulic rapid descent valve control relay KC44 and / or a second hydraulic rapid descent valve control relay KC54. The first hydraulic rapid descent valve control relay KC44 and / or the second hydraulic rapid descent valve control relay KC54 are hydraulic rapid descent valve control relays. When the coils of the first hydraulic rapid descent valve control relay KC44 and / or the second hydraulic rapid descent valve control relay KC54 are energized, the hydraulic rapid descent valve opens, and the boarding bridge rapidly descends.

[0073] The emergency descent module also includes a hydraulic deadweight settlement valve control relay, which includes a coil. When energized, the coil of the hydraulic deadweight settlement valve control relay controls the hydraulic deadweight settlement valve to open, and when de-energized, controls the hydraulic deadweight settlement valve to close. The hydraulic settlement valve includes a first hydraulic deadweight settlement valve control relay KC45 and / or a second hydraulic deadweight settlement valve controller KC45A. The first hydraulic deadweight settlement valve control relay KC45 and / or the second hydraulic deadweight settlement valve control relay KC45A are hydraulic deadweight settlement valve control relays. When the coils of the first hydraulic deadweight settlement valve control relay KC45 and / or the second hydraulic deadweight settlement valve control relay KC45A are energized, the hydraulic deadweight settlement valve opens, allowing the boarding bridge to descend under its own weight. It should be emphasized that the speed at which the boarding bridge descends under its own weight is slower than the speed of rapid descent under the action of a hydraulic rapid descent valve.

[0074] In an embodiment of the present disclosure, the boarding bridge control circuit may further include: an intermediate relay KC74 for automatic leveling mode of the boarding bridge and an intermediate relay KC38 for safety boot failure, wherein the intermediate relay KC74 for automatic leveling mode of the boarding bridge and the intermediate relay KC38 for safety boot failure are connected; the intermediate relay KC74 for automatic leveling mode of the boarding bridge is energized in the coil and the contacts (41, 44) are closed when the boarding bridge is in the automatic leveling mode, and the coil is de-energized and the contacts (41, 44) are disconnected when the boarding bridge is not in the automatic leveling mode; the intermediate relay KC38 for safety boot failure is used to energize the coil and the contacts (21, 24) are closed when the safety boot is operating normally, and to de-energize and the contacts (21, 24) are disconnected when the safety boot fails. One end of the automatic leveling mode intermediate relay KC74 can be connected to the input end of the boarding bridge control circuit to be triggered by the automatic leveling mode signal of the boarding bridge and turned on. The other end of the automatic leveling mode intermediate relay KC74 is connected to the safety shoe fault intermediate relay KC38 to enable the boarding bridge to be controlled by the safety shoes and descend when the automatic leveling mode intermediate relay KC74 is turned on and the safety shoes are normal.

[0075] The following describes the process of controlling the descent of the boarding bridge by the boarding bridge control circuit in different scenarios.

[0076] Scene 1

[0077] In this scenario, the boarding bridge switches to the automatic leveling mode, the normally open contacts (44, 41) of the boarding bridge automatic leveling mode intermediate relay KC74 are connected, the PLC control module of the boarding bridge control system operates normally, the normally closed contacts (11, 12) of the tenth relay KC83 that monitors the status of the PLC control module are in the open state at this time, and in addition, the normally closed contacts (21, 22) of the ninth relay KC55 controlled by the PLC control module are in the closed state, the power supply circuit of the lifting oil pump motor of the boarding bridge is normal, the normally closed contacts (11, 12) of the first relay KC81 for monitoring the power supply circuit of the lifting oil pump motor of the boarding bridge, the normally closed contacts (31, 32) of the second relay KC111 and the normally closed contacts (31, 32) of the third relay KC112 are all disconnected, causing the coil of the fourth relay KC265 to lose power, and the safety boot has no fault, and the normally open contacts (21, 24) of the safety boot fault intermediate relay KC38 are connected.

[0078] When the aircraft door moves downward, the action signal of the safety boots is triggered, so that the normally open contacts (21, 24) of the safety boots action intermediate relay KC35 are closed. Since the coil of the fourth relay KC265 is in a de-energized state at this time, its first group of contacts (21, 22) is closed. The closing of its first group of contacts (21, 22) enables the coil of the first time relay KT5 to be energized. The first group of contacts (24, 25) of the first time relay KT5 is immediately closed. The first time relay KT5 receives the action signal and generates a first descent start signal, thereby controlling the coil of the fifth relay KC262 to be energized, and the first group of contacts (11, 14) and the second group of contacts (21, 24) of the fifth relay KC262 are closed. At this time, the normally closed contacts (21, 22) of the ninth relay KC55 + the first group of contacts (11, 12) of the sixth relay KC261 + the first group of contacts (11, 12) of the eighth relay KC275 + the second group of contacts (11, 14) of the fifth relay KC262 are closed to control the start of the lifting oil pump motor of the boarding bridge; the normally closed contacts (21, 22) of the ninth relay KC55 + the first group of contacts (11, 12) of the sixth relay KC261 + the first group of contacts (11, 12) of the eighth relay KC275 + the first group of contacts (21, 24) of the fifth relay KC262 control the coils of the first hydraulic quick-descent valve control relay KC44 and / or the second hydraulic quick-descent valve control relay KC54 to be energized, and the hydraulic quick-descent valve is opened, that is, the emergency rapid descent module controls the descent of the boarding bridge according to the first descent start signal. Under the action of the hydraulic quick-descent valve, the boarding bridge is rapidly lowered in an emergency, for example, the boarding bridge is rapidly lowered at a set speed V, wherein the set speed V can be set to a value of 0.1 to 0.2 m / s.

[0079] During the emergency descent of the boarding bridge, if the action signal of the safety boot (i.e., the normally open contacts (21, 24) of the safety boot action intermediate relay KC35 are closed) lasts for less than the first preset time length t1 (t1 can be 0.5-2s, such as 1s) set by the first time relay KT5, then when the action signal of the safety boot stops, the normally open contacts (21, 24) of the safety boot action intermediate relay KC35 are disconnected, the coil of the first time relay KT5 loses power, the first group of contacts (24, 25) of the first time relay KT5 is disconnected, the coil of the fifth relay KC262 loses power, the first group of contacts (21, 24) and the second group of contacts (11, 14) of the fifth relay KC262 are disconnected, the coils of the first hydraulic quick-descent valve control relay KC44 and the second hydraulic quick-descent valve control relay KC54 lose power, the hydraulic quick-descent valve is closed, and the synchronous lifting oil pump motor of the boarding bridge stops working, thereby causing the boarding bridge to stop descending. When the duration of the action signal of the safety boots is less than the preset duration, the descent control module controls the boarding bridge to descend for a time equal to the duration of the action signal, and the boarding bridge continues to descend for less than the preset duration.

[0080] During the emergency descent of the boarding bridge, if the duration of the action signal of the safety boot is not less than the first preset time length t1 set by the first time relay KT5, before the safety boot trigger signal stops, the second group of contacts (15, 18) of the first time relay KT5 is closed, the coil of the sixth relay KC261 is energized, the first group of contacts (11, 12) of the sixth relay KC261 is disconnected, the coils of the first hydraulic quick-descent valve control relay KC44 and the second hydraulic quick-descent valve control relay KC54 are de-energized, the hydraulic quick-descent valve is closed, the lifting oil pump motor of the boarding bridge stops working, and the boarding bridge stops descending; at the same time, the second group of contacts (21 , 24) are closed, the second group of contacts (21, 24) of the sixth relay KC261 controls the coil of the first time relay KT5 to remain energized, so that the first time relay KT5 continues to operate, the second group of contacts (15, 18) of the first time relay KT5 continues to close, the coil of the sixth relay KC261 continues to be energized, and the first group of contacts (11, 12) of the sixth relay KC261 is kept disconnected, so that even if the safety boots are triggered again, the boarding bridge will not descend again unless it is switched to manual mode to disconnect the normally open contacts (44, 41) of the intermediate relay KC74 in the boarding bridge automatic leveling mode, thereby resetting the first time relay KT5. When the duration of the safety boots action signal exceeds the first preset time length t1, the descent control module controls the boarding bridge to descend for a time length equal to the first preset time length t1, and thereafter the first time relay KT5 generates and continuously generates the first descent stop signal to keep the boarding bridge from descending.

[0081] During the emergency descent of the boarding bridge, if the duration of the action signal of the safety boot is less than the first preset time length t1 set by the first time relay KT5, but the number of times the safety boot is triggered reaches the maximum number of actions allowed set in the PLC control module (for example, 3 times) or the cumulative distance of the emergency descent of the boarding bridge reaches the maximum distance allowed set in the PLC control module (for example, 400 mm), then when the safety boot is triggered again, the PLC control module controls the normally closed contacts (21, 22) of the ninth relay KC55 to be disconnected, disconnecting the connection between the safety boot action intermediate relay KC35 and the hydraulic quick-descent valve, and the coils of the first hydraulic quick-descent valve control relay KC44 and the second hydraulic quick-descent valve control relay KC54 lose power, and the hydraulic quick-descent valve stops working. Even if the safety boot is triggered again later so that the normally open contacts (21, 24) of the safety boot action intermediate relay KC35 are closed, it is impossible to control the boarding bridge to descend again.

[0082] Scene 2

[0083] In this scenario, the boarding bridge switches to the automatic leveling mode, the normally open contacts (44, 41) of the intermediate relay KC74 of the boarding bridge automatic leveling mode are connected, the PLC control module of the boarding bridge control system operates normally, the normally closed contacts (11, 12) of the tenth relay KC83 that monitors the status of the PLC control module are in the disconnected state, and the normally closed contacts (21, 22) of the ninth relay KC55 controlled by the PLC control module are in the normally closed state, and the lifting oil of the boarding bridge is turned off. The power supply circuit of the pump motor fails, and the normally closed contacts (11, 12) of the first relay KC81 and / or the normally closed contacts (31, 32) of the second relay KC111 and / or the normally closed contacts (31, 32) of the third relay KC112 for monitoring the power supply circuit of the lifting oil pump motor of the boarding bridge are closed, so that the coil of the fourth relay KC265 is energized, and the safety shoe has no fault, and the normally open contacts (21, 24) of the safety shoe fault intermediate relay KC38 are connected.

[0084] When the aircraft door moves downward, the action signal of the safety boots is triggered, and the normally open contacts (21, 24) of the safety boots action intermediate relay KC35 are closed. Since the coil of the fourth relay KC265 is energized, the first group of contacts (21, 22) of the fourth relay KC265 is disconnected, and the second group of contacts (31, 34) of the fourth relay KC265 is closed, so that the coil of the second time relay KT4 is energized. The first group of contacts (24, 25) of the second time relay KT4 is immediately closed, that is, the second time relay KT4 generates a second descent start signal according to the received action signal, so that the coil of the seventh relay KC276 is energized, and the seventh relay KC The first group of contacts (21, 24) of 276 is closed, so that the normally closed contacts (21, 22) of the ninth relay KC55, the first group of contacts (11, 12) of the sixth relay KC261, the first group of contacts (11, 12) of the eighth relay KC275, and the first group of contacts (21, 24) of the seventh relay KC276 control the coils of the first hydraulic deadweight settlement valve control relay KC45 and / or the second hydraulic deadweight settlement valve control relay KC45A to be energized, thereby controlling the hydraulic deadweight settlement valve (also known as the emergency descent valve) to open, and the boarding bridge to descend by its own weight in an emergency manner, that is, the emergency descent module controls the descent of the boarding bridge according to the second descent start signal. Due to a fault in the power supply system of the boarding bridge's lifting oil pump motor, it cannot be started, so that the boarding bridge cannot be quickly descended under the action of the hydraulic quick descent valve and can only descend at an emergency settlement speed (e.g., less than 0.1 m / s).

[0085] During the emergency descent of the boarding bridge, if the action signal of the safety boots (the normally open contacts (21, 24) of the safety boots action intermediate relay KC35 are closed) lasts for less than the second preset time t2 set by the second time relay KT4 (t2 is set according to the emergency sinking speed, for example, 5s), then when the safety boots are triggered, the coil of the second time relay KT4 loses power, the first group of contacts (24, 25) of the second time relay KT4 is disconnected, the coil of the seventh relay KC276 loses power, the coils of the first hydraulic deadweight sinking valve control relay KC45 and the second hydraulic deadweight sinking valve control relay KC45A lose power, the hydraulic deadweight sinking valve closes, and the boarding bridge stops descending. When the action signal of the safety boots lasts for less than the second preset time t2, the descent control module controls the boarding bridge to descend for a time equal to the action signal duration, and the boarding bridge continues to descend for less than the second preset time t2. In actual application, since the speed of the self-weight settling is slower than the speed of the rapid descent, the second preset time length t2 of the second time relay KT4 is greater than the first preset time length t1 of the first time relay KT5.

[0086] During the emergency descent of the boarding bridge, if the duration of the action signal of the safety boots is not less than the second preset time length t2 set by the second time relay KT4, the delayed action contact of the second time relay KT4, that is, the second group of contacts (15, 18) of the second time relay KT4 is closed, the coil of the eighth relay KC275 is energized, the first group of contacts (11, 12) of the eighth relay KC275 is disconnected, the first group of contacts (11, 12) of the eighth relay KC275 and the first group of contacts (21, 24) of the seventh relay KC276 control the coils of the first hydraulic deadweight settlement valve control relay KC45 and the second hydraulic deadweight settlement valve control relay KC45A to lose power, and the hydraulic deadweight settlement valve is energized. The valve is closed, and the boarding bridge stops descending. At the same time, the second group of contacts (21, 24) of the eighth relay KC275 is closed, controlling the coil of the second time relay KT4 to remain energized. The second group of contacts (21, 24) of the eighth relay KC275 keeps the second time relay KT4 in continuous action. Even if the safety boot is triggered again, the boarding bridge will not descend again. Moreover, the first group of contacts (11, 12) of the eighth relay KC275 remains in an open state, so that even if the oil pump motor returns to normal, the boarding bridge will not descend again. Unless the manual mode is switched to open the normally open contacts (44, 41) of the intermediate relay KC74 in the boarding bridge automatic leveling mode, the second time relay KT4 is reset. When the duration of the safety boot action signal exceeds the second preset time length t2, the descent control module controls the boarding bridge to descend for a time length equal to the second preset time length t2. Thereafter, the second time relay KT4 generates and continuously generates a second descent stop signal to keep the boarding bridge from descending.

[0087] During the emergency descent of the boarding bridge, if the duration of the safety boot trigger signal is less than the second preset time length t2 set by the second time relay KT4, but the number of times the safety boot is triggered reaches the maximum number of actions allowed set in the PLC control module (for example, 3 times) or the distance of the emergency descent of the boarding bridge reaches the maximum distance allowed set in the PLC control module (for example, 400mm), then when the safety boot is triggered again, the PLC control module controls the coil of the ninth relay KC55 to be energized, the normally closed contacts (21, 22) of the ninth relay KC55 are disconnected, the coils of the first hydraulic deadweight settlement valve control relay KC45 and the second hydraulic deadweight settlement valve control relay KC45A are de-energized, the hydraulic deadweight settlement valve is closed, and the boarding bridge cannot be lowered again.

[0088] Scenario 3

[0089] In this scenario, the boarding bridge switches to the automatic leveling mode, the normally open contacts (44, 41) of the intermediate relay KC74 of the boarding bridge automatic leveling mode are connected, the PLC control module of the boarding bridge control system fails, and the normally closed contacts (11, 12) of the tenth relay KC83 that monitors the status of the PLC control module are in a closed state. In addition, the normally closed contacts (21, 22) of the ninth relay KC55 controlled by the PLC control module are in a normally closed state. When the PLC control module fails, the normally closed contacts ( 21, 22) always remain closed, the power supply circuit of the lifting oil pump motor of the boarding bridge is normal, the normally closed contacts (11, 12) of the first relay KC81, the normally closed contacts (31, 32) of the second relay KC111, and the normally closed contacts (31, 32) of the third relay KC112 for monitoring the power supply circuit of the lifting oil pump motor of the boarding bridge are all disconnected, causing the coil of the fourth relay KC265 to lose power, and the safety boot has no fault, and the normally open contacts (21, 24) of the safety boot fault intermediate relay KC38 are connected.

[0090] When the aircraft door moves downward, the action signal of the safety boot is triggered, the normally open contacts (21, 24) of the safety boot action intermediate relay KC35 are closed, the coil of the first time relay KT5 is energized, and the first group of contacts (24, 25) of the first time relay KT5 is immediately closed, thereby controlling the coil of the fifth relay KC262 to be energized. At this time, the normally closed contacts (21, 22) of the ninth relay KC55, the first contact group (11, 12) of the eighth relay KC275, the first contact group (11, 12) of the sixth relay KC261, and the second contact group (11, 14) of the fifth relay KC262 control the start of the boarding bridge's lift oil pump motor; the normally closed contacts (21, 22) of the ninth relay KC55, the first contact group (11, 12) of the eighth relay KC275, the first contact group (11, 12) of the sixth relay KC261, and the first contact group (21, 24) of the fifth relay KC262 control the coils of the first hydraulic quick-descent valve control relay KC44 and / or the second hydraulic quick-descent valve control relay KC54 to energize, opening the hydraulic quick-descent valve. Under the action of the hydraulic quick-descent valve, the boarding bridge descends urgently; the boarding bridge descends rapidly at a set speed V, where the set speed V can be 0.1 to 0.2 m / s.

[0091] When the emergency rapid descent time of the boarding bridge reaches the maximum time allowed for emergency descent, the emergency rapid descent of the boarding bridge stops and the boarding bridge is prohibited from descending again. Specifically, when the first preset time length t1 set by the first time relay KT5 is reached, the delayed action contact of the first time relay KT5, that is, the second group of contacts (15, 18) is closed, the coil of the sixth relay KC261 is energized, the normally closed contact (11, 12) of the sixth relay KC261 is disconnected, the coils of the first hydraulic rapid descent valve control relay KC44 and the second hydraulic rapid descent valve control relay KC54 are de-energized, the hydraulic rapid descent valve is closed, the synchronous boarding bridge lifting oil pump motor stops working, and the boarding bridge stops descending; at the same time, the second group of contacts (21, 24) of the sixth relay KC261 is closed, and the line of the first time relay KT5 is controlled. The coil remains energized, causing the first time relay KT5 to continue to operate, the second group of contacts (15, 18) of the first time relay KT5 to remain closed, the coil of the sixth relay KC261 to continue to be energized, and the first group of contacts (11, 12) of the sixth relay KC261 to remain disconnected, and the coils of the first hydraulic quick-drop valve control relay KC44 and the second hydraulic quick-drop valve control relay KC54 to lose power. Therefore, even if the safety boots are triggered again, the boarding bridge will not descend again, unless it is switched to manual mode to disconnect the normally open contacts (44, 41) of the intermediate relay KC74 in the automatic leveling mode of the boarding bridge, thereby resetting the first time relay KT5.

[0092] The difference between scenario three and scenario one is that in scenario three, due to a failure of the PLC control module, the PLC control module cannot participate in the control of the boarding bridge's descent process and cannot control the boarding bridge to stop descending according to the number of times the safety boots are triggered or the height to which the boarding bridge descends. Therefore, the normally closed contacts (11, 12) of the tenth relay KC83 and the third group of contacts (31, 34) of the fifth relay KC262 keep the first time relay KT5 in continuous action, so that the boarding bridge directly descends for the first preset time t1 set by the first time relay KT5. For example, if the set first preset time t1 is 1s, the boarding bridge descends and can only stop descending after 1s. When the PLC fault monitoring module detects a failure of the PLC control module, the first time relay KT5 generates a descent start signal of a preset time according to the received action signal. After the emergency rapid descent module controls the boarding bridge to perform descent control for a preset time according to the descent start signal of the preset time, the first time relay KT5 continues to generate a descent stop signal.

[0093] Scene 4

[0094] In this scenario, the boarding bridge switches to the automatic leveling mode, the normally open contacts (44, 41) of the intermediate relay KC74 of the boarding bridge automatic leveling mode are connected, the PLC control module of the boarding bridge control system fails, and the normally closed contacts (11, 12) of the tenth relay KC83 that monitors the status of the PLC control module are in the closed state. In addition, the normally closed contacts (21, 22) of the ninth relay KC55 controlled by the PLC control module are in the normally closed state. When the PLC control module fails, the normally closed contacts (21, 22) of the ninth relay KC55 are in the normally closed state. 1, 22) always remain closed, the power supply circuit of the lifting oil pump motor of the boarding bridge fails, the normally closed contacts (11, 12) of the first relay KC81 and / or the normally closed contacts (31, 32) of the second relay KC111 and / or the normally closed contacts (31, 32) of the third relay KC112 for monitoring the circuit of the power supply of the lifting oil pump motor of the boarding bridge are closed, so that the coil of the fourth relay KC265 is energized, and the safety shoe has no fault, and the normally open contacts (21, 24) of the safety shoe fault intermediate relay KC38 are connected.

[0095] When the aircraft door moves downward, the action signal of the safety boots is triggered, and the normally open contacts (21, 24) of the safety boots action intermediate relay KC35 are closed. Since the coil of the fourth relay KC265 is energized, the first group of normally closed contacts (21, 22) of the fourth relay KC265 is disconnected, and the second group of normally open contacts (31, 34) of the fourth relay KC265 is closed, so that the coil of the second time relay KT4 is energized. The first group of contacts (24, 25) of the second time relay KT4 is immediately closed, so that the coil of the seventh relay KC276 is energized. The seventh relay KC277 is closed. The first set of contacts (21, 24) of relay KC6 is closed, causing the normally closed contacts (21, 22) of relay KC55, the first set of contacts (11, 12) of relay KC261, the first set of contacts (11, 12) of relay KC275, and the first set of contacts (21, 24) of relay KC276 to energize the coils of relay KC45 and KC45A, thereby controlling the opening of the hydraulic deadweight settlement valve (also known as the emergency descent valve), and the boarding bridge descends under its own gravity. Due to a fault in the power supply system of the boarding bridge's lifting oil pump motor, it cannot be started, making it impossible for the boarding bridge to descend quickly under the action of the hydraulic quick descent valve and can only descend at an emergency settlement speed (e.g., less than 0.1 m / s). When the boarding bridge's descent time reaches the maximum time allowed for emergency descent, the boarding bridge's emergency descent stops and the boarding bridge is prohibited from descending again.

[0096] Specifically, when the second preset time length t2 set by the second time relay KT4 is reached, the second group of contacts (15, 18) of the second time relay KT4 is closed, the coil of the eighth relay KC275 is energized, and the first group of contacts (11, 12) of the eighth relay KC275 is disconnected, thereby controlling the coils of the first hydraulic deadweight settlement valve control relay KC45 and the second hydraulic deadweight settlement valve control relay KC45A to lose power, the hydraulic deadweight settlement valve is closed, and the boarding bridge stops descending; at the same time, the eighth relay KC2 The second set of contacts (21, 24) of 75 are closed, controlling the coil of the second time relay KT4 to remain energized, so that the boarding bridge will not descend again even if the safety boots are triggered again; and the first set of contacts (11, 12) of the eighth relay KC275 remain disconnected, so that the boarding bridge will not descend again even if the oil pump motor returns to normal; unless the manual mode is switched to open the normally open contacts (44, 41) of the intermediate relay KC74 in the automatic leveling mode of the boarding bridge, thereby resetting the second time relay KT4.

[0097] The difference between scenario 4 and scenario 2 is that due to the failure of the PLC control module, the PLC control module cannot participate in the control of the boarding bridge descent process, and therefore cannot control the boarding bridge to stop descending according to the number of times the safety boots are triggered or the height to which the boarding bridge descends. Therefore, the normally closed contacts (11, 12) of the tenth relay KC83 and the second group of contacts (31, 34) of the seventh relay KC276 keep the second time relay KT4 in continuous action, so that the boarding bridge directly descends for the second preset time t2 set by the second time relay KT4. For example, if the set second preset time t2 is 5s, the boarding bridge descends and can only stop descending after 5s. When the PLC fault monitoring module detects a failure of the PLC control module, the second time relay KT4 generates a descent start signal of the preset time according to the received action signal. After the emergency rapid descent module controls the boarding bridge to perform descent control for the preset time according to the descent start signal of the preset time, the second time relay KT4 continues to generate a descent stop signal.

[0098] An exemplary embodiment of the present disclosure shows a boarding bridge control method, which is applied to any boarding bridge control circuit provided in the embodiment of the present disclosure, in combination with Figure 3 As shown, the boarding bridge control method includes:

[0099] Step S310: The safety boots monitoring module obtains an action signal.

[0100] Specifically, after the boarding bridge enters the automatic leveling mode, when the aircraft door moves downward, an action signal of the safety boots is triggered, and the safety boots monitoring module obtains the action signal.

[0101] Step S320: The time limit switch generates a descending start signal according to the action signal.

[0102] Specifically, the safety shoe monitoring module obtains the action signal and transmits it to the time limit switch, and the time limit switch generates a descent start signal according to the action signal.

[0103] Step S330: The descent control module controls the boarding bridge to descend according to the descent start signal.

[0104] Specifically, the descent start signal generated by the time limit switch is transmitted to the descent control module, which then controls the descent of the boarding bridge based on the descent start signal. If the duration of the action signal is less than a preset time, the descent start signal disappears at the same time as the action signal, causing the descent control module to stop controlling the boarding bridge's descent. If the duration of the action signal exceeds the preset time, the subsequent step S340 is executed.

[0105] Step S340: When the boarding bridge continues to descend for more than a preset time, the time limit switch generates a descent stop signal.

[0106] Specifically, when the duration of the action signal exceeds a preset time, and correspondingly, when the boarding bridge continues to descend for more than a preset time, the time limit switch generates a descent stop signal.

[0107] Step S350: the descent control module controls the boarding bridge to stop descending according to the descent stop signal.

[0108] Specifically, the descent stop signal generated by the time limit switch is transmitted to the descent control module, and the descent control module controls the boarding bridge to stop descending according to the descent stop signal.

[0109] Step S360: The time limit switch continuously generates a descent stop signal to keep the boarding bridge from descending.

[0110] Specifically, the time limit switch continuously generates a descent stop signal to keep the boarding bridge from descending, that is, the subsequent action signal of the safety boots cannot trigger the boarding bridge descent control.

[0111] The PLC control module of the boarding bridge control system assists in participating in the boarding bridge control method. The PLC control module controls the number of descents and the descent height. If the boarding bridge continues to descend for a period of time that does not exceed the preset time, but the number of descents or the descent height exceeds the threshold, the PLC control module will control and keep the boarding bridge from descending. Figure 4 As shown, after step S330, the boarding bridge control method may further include:

[0112] Step S331: When the number of descents or the descent height exceeds a threshold, the PLC control signal receiving module receives a control stop signal generated by the PLC control module of the boarding bridge control system.

[0113] Specifically, the PLC control module performs statistics and logical judgment on the number of descents and the descent height. When the number of descents or the descent height exceeds the threshold, the PLC control module generates a control stop signal and sends it to the PLC control signal receiving module, and the PLC control signal receiving module receives the control stop signal.

[0114] Step S332: the descent control module controls and keeps the boarding bridge from descending according to the control stop signal.

[0115] Specifically, after the PLC control signal receiving module receives the control stop signal, it transmits it to the descent control module. The descent control module controls and keeps the boarding bridge from descending according to the control stop signal, and the descent control module can subsequently keep the boarding bridge from descending by stopping receiving the descent start signal or other methods, that is, the subsequent action signal of the safety boots can no longer trigger the boarding bridge descent control.

[0116] Figure 5 This is a flow chart of a method for controlling a boarding bridge according to an exemplary embodiment of the present disclosure, corresponding to the scenario 1 mentioned in the boarding bridge control circuit of the embodiment of the present disclosure, that is, the power supply circuit of the lifting oil pump motor of the boarding bridge and the PLC control module of the boarding bridge control system are both normal, such as Figure 5 As shown, the boarding bridge control method includes:

[0117] Step S510: The safety boots monitoring module obtains an action signal.

[0118] Step S520: the first time relay generates a first descending start signal according to the action signal;

[0119] Step S530: The emergency rapid descent module controls the descent of the boarding bridge according to the first descent start signal.

[0120] Specifically, the emergency rapid descent module controls the descent of the boarding bridge based on the first descent activation signal. When the safety boots' actuation signal lasts for less than a first preset duration t1, the actuation signal disappears, and the first descent activation signal disappears. The emergency rapid descent module then stops controlling the descent of the boarding bridge, and the boarding bridge stops descending. When the safety boots' actuation signal lasts for more than the preset duration, the subsequent step S540 is executed.

[0121] Step S540: When the boarding bridge continues to descend for more than a first preset time, the first time relay generates a first descent stop signal.

[0122] Step S550: the emergency rapid descent module controls the boarding bridge to stop descending according to the first descent stop signal.

[0123] Step S560: The first time relay continuously generates the first descent stop signal to keep the boarding bridge from descending.

[0124] The PLC control module of the boarding bridge control system assists in the boarding bridge control method, controlling the number of descents and the height of descent. If the boarding bridge continues to descend for no longer than a first preset duration, but the number of descents or the height of descent exceeds a threshold, the PLC control module controls and maintains the boarding bridge's descent. After step S530, the boarding bridge control method may further include:

[0125] When the number of descents or the descent height exceeds a threshold, the PLC control signal receiving module receives a control stop signal generated by a PLC control module of the boarding bridge control system.

[0126] The emergency rapid descent module controls and maintains the boarding bridge to stop descending according to the control stop signal.

[0127] Figure 6This is a flow chart of a method for controlling a boarding bridge according to an exemplary embodiment of the present disclosure, corresponding to the second scenario mentioned in the boarding bridge control circuit of the embodiment of the present disclosure, that is, the power circuit of the lifting oil pump motor of the boarding bridge fails and the PLC control module of the boarding bridge control system is normal, such as Figure 6 As shown, the boarding bridge control method includes:

[0128] Step S610: The safety boots monitoring module obtains an action signal;

[0129] Step S620: the second time relay generates a second descending start signal according to the action signal;

[0130] Step S630: The emergency descent module controls the boarding bridge to descend according to the second descent start signal.

[0131] Specifically, the emergency descent module controls the descent of the boarding bridge based on the second descent activation signal. When the safety boots' actuation signal lasts for less than a second preset duration, t2, and the actuation signal disappears, the second descent activation signal disappears, causing the emergency descent module to cease controlling the boarding bridge's descent. If the safety boots' actuation signal lasts for more than the preset duration, the subsequent step, S640, is executed.

[0132] Step S640: When the boarding bridge continues to descend for more than a second preset time, the second time relay generates a second descent stop signal.

[0133] Step S650: the emergency rapid descent module controls the boarding bridge to stop descending according to the second descent stop signal.

[0134] Step S660: The second time relay continuously generates the second descent stop signal to keep the boarding bridge from descending.

[0135] The PLC control module of the boarding bridge control system assists in the boarding bridge control method, controlling the number of descents and the height of descent. If the boarding bridge continues to descend for no longer than a second preset duration, but the number of descents or the height of descent exceeds a threshold, the PLC control module controls and maintains the boarding bridge's descent. After step S630, the boarding bridge control method may further include:

[0136] When the number of descents or the descent height exceeds a threshold, the PLC control signal receiving module receives a control stop signal generated by a PLC control module of the boarding bridge control system.

[0137] The emergency descent module controls and keeps the boarding bridge from descending according to the control stop signal.

[0138] Figure 7This is a flow chart of a method for controlling a boarding bridge according to an exemplary embodiment of the present disclosure, corresponding to the scenario three mentioned in the boarding bridge control circuit of the embodiment of the present disclosure, that is, the power supply circuit of the lifting oil pump motor of the boarding bridge is normal and the PLC control module of the boarding bridge control system is faulty, such as Figure 7 As shown, the boarding bridge control method includes:

[0139] Step S710: The safety boots monitoring module obtains an action signal.

[0140] Step S720: The first time relay generates a first falling start signal of a first preset duration according to the action signal.

[0141] Step S730: The emergency rapid descent module controls the boarding bridge to descend for the first preset time according to the first descent start signal of the first preset time.

[0142] Step S740: The first time relay generates a first descending stop signal.

[0143] Step S750: The emergency rapid descent module controls the boarding bridge to stop descending according to the first descent stop signal.

[0144] Step S760: The first time relay continuously generates the first descent stop signal to keep the boarding bridge from descending.

[0145] Figure 8 This is a flow chart of a method for controlling a boarding bridge according to an exemplary embodiment of the present disclosure, corresponding to the fourth scenario mentioned in the boarding bridge control circuit of the embodiment of the present disclosure, that is, the power supply circuit of the lifting oil pump motor of the boarding bridge fails and the PLC control module of the boarding bridge control system fails, such as Figure 8 As shown, the boarding bridge control method includes:

[0146] Step S810: The safety boots monitoring module obtains an action signal.

[0147] Step S820: The second time relay generates a second falling start signal of a second preset duration according to the action signal.

[0148] Step S830: The emergency descent module controls the boarding bridge to descend for the second preset time according to the second descent start signal of the second preset time.

[0149] Step S840: The second time relay generates a second descending stop signal.

[0150] Step S850: The emergency descent module controls the boarding bridge to stop descending according to the second descent stop signal.

[0151] Step S860: The second time relay continuously generates the second descent stop signal to keep the boarding bridge from descending.

[0152] The present disclosure also provides an aerobridge control device, comprising a memory and a processor. The memory is used to store program code, and the processor is used to call the program code to execute any of the aerobridge control methods provided in the present disclosure.

[0153] The present disclosure also provides a boarding bridge, which includes any one of the boarding bridge control circuits provided in the present disclosure. In some preferred embodiments, the boarding bridge also includes a boarding bridge control system, which includes a PLC control module.

[0154] The embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, any one of the boarding bridge control methods provided by the embodiments of the present disclosure is implemented.

[0155] It should be noted that although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be concretized in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0156] Furthermore, although the steps of the method of the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0157] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0158] Furthermore, although the steps of the method of the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0159] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. The boarding bridge control circuit is used to control the movement of the boarding bridge when the boarding bridge safety shoes are triggered, and is characterized by: include: A safety boot monitoring module, configured to detect an action signal of the safety boot; a time control module, the time control module including a time limit switch, the time limit switch being configured to generate a descent start signal and a descent stop signal, the time limit switch generating the descent start signal upon receiving the action signal, and continuously generating the descent stop signal to stop the descent of the boarding bridge when the boarding bridge continues to descend for more than a preset time period; a descent control module, configured to control the descent of the boarding bridge according to the descent start signal, and to control the boarding bridge to stop descent according to the descent stop signal; Wherein, the circuit further comprises: a power circuit monitoring module coupled with the power circuit of the lifting oil pump motor of the boarding bridge, for monitoring the power circuit of the lifting oil pump motor; The descent control module includes an emergency rapid descent module and an emergency descent module; The time limit switch includes a first time relay and a second time relay, the first time relay is used to generate a first descent start signal and continuously generate a first descent stop signal, the emergency rapid descent module is used to control the descent of the boarding bridge according to the first descent start signal and control the boarding bridge to stop descent according to the first descent stop signal; the second time relay is used to generate a second descent start signal and continuously generate a second descent stop signal, the emergency descent module is used to control the descent of the boarding bridge according to the second descent start signal and control the boarding bridge to stop descent according to the second descent stop signal; When the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is normal, the first time relay generates the first descent start signal when receiving the action signal, and the first time relay continues to generate the first descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the first preset time length; when the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is faulty, the second time relay generates the second descent start signal when receiving the action signal, and the second time relay continues to generate the second descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the second preset time length.

2. The boarding bridge control circuit according to claim 1, characterized in that: The power circuit monitoring module includes a first relay and / or a second relay and / or a third relay and a fourth relay, wherein the first relay and / or the second relay and / or the third relay are connected to the fourth relay to control the power supply or power loss of the coil of the fourth relay, and the fourth relay includes a first group of normally closed contacts and a second group of normally open contacts; When the power supply circuit of the lifting oil pump motor of the boarding bridge fails, at least one of the first relay, the second relay and the third relay is connected, so that the coil of the fourth relay is energized, the first group of contacts of the fourth relay is disconnected, so that the first time relay cannot receive the action signal, and the second group of contacts of the fourth relay is connected, so that the second time relay receives the action signal.

3. The boarding bridge control circuit according to claim 2, characterized in that: The first relay is triggered by a trip signal of a protection circuit breaker of a power circuit of a lifting oil pump motor of the boarding bridge; and / or, The second relay is triggered by a power failure signal of the power supply of the lifting oil pump motor of the boarding bridge; and / or, The third relay is triggered by a three-phase unbalanced signal of the power supply of the lifting oil pump motor of the boarding bridge.

4. The boarding bridge control circuit according to claim 1, characterized in that: The time control module further includes a fifth relay and a sixth relay, the fifth relay including a coil, a first set of normally open contacts, and a second set of normally open contacts. The coil of the fifth relay is energized after the first time relay generates the first descent start signal, and the first set of contacts and the second set of contacts of the fifth relay are connected, so that the emergency rapid descent module receives the first descent start signal. The sixth relay includes a coil, a first group of normally closed contacts and a second group of normally open contacts. The coil of the sixth relay is energized after the first time relay generates the first descent stop signal. The first group of contacts of the sixth relay is disconnected, so that the emergency rapid descent module receives the first descent stop signal. The second group of contacts of the sixth relay is connected, so that the first time relay continues to generate the first descent stop signal.

5. The boarding bridge control circuit according to claim 1, characterized in that: The time control module also includes: a seventh relay and an eighth relay, wherein the seventh relay includes a first set of normally open contacts and a coil, the coil of the seventh relay being energized after the second time relay generates the second descent start signal, and the first set of contacts of the seventh relay being closed, so that the emergency descent module receives the second descent start signal; The eighth relay includes a first group of normally closed contacts, a second group of normally open contacts and a coil. The coil of the eighth relay is energized after the second time relay generates the second descent stop signal. The first group of contacts of the eighth relay is disconnected, so that the emergency descent module receives the second descent stop signal. The second group of contacts of the eighth relay is closed, so that the second time relay continues to generate the second descent stop signal.

6. The boarding bridge control circuit according to claim 1, characterized in that: The boarding bridge further comprises a PLC control signal receiving module, the PLC control signal receiving module being used to receive a control stop signal generated by a PLC control module of the boarding bridge control system, and the descent control module being further used to control and maintain the boarding bridge to stop descending according to the control stop signal; and / or; It also includes a PLC fault monitoring module. When the PLC fault monitoring module detects a fault in the PLC control module of the boarding bridge control system, the time limit switch generates a descent start signal of the preset duration according to the received action signal. After the descent control module controls the boarding bridge to perform descent control for the preset duration according to the descent start signal of the preset duration, the time limit switch continues to generate the descent stop signal.

7. The boarding bridge control circuit according to claim 1, characterized in that: The time limit switch is a time relay, which includes a first group of contacts and a second group of contacts. The time relay is used to make the first group of contacts of the time relay instantly connected to generate the descent start signal when receiving the action signal, and the second group of contacts of the time relay is connected to continuously generate the descent stop signal when the continuous descent time of the boarding bridge exceeds the preset time length.

8. A boarding bridge control method, characterized in that: Applied to the boarding bridge control circuit according to any one of claims 1 to 7, the method comprising: The safety boots monitoring module obtains the action signal; The time limit switch generates a descending start signal according to the action signal; The descent control module controls the descent of the boarding bridge according to the descent start signal; When the boarding bridge continues to descend for more than a preset time, the time limit switch generates a descent stop signal; The descent control module controls the boarding bridge to stop descending according to the descent stop signal; The time limit switch continuously generates the descent stop signal to keep the boarding bridge from descending; Wherein, the method further comprises: a power circuit monitoring module monitoring a power circuit of the lift oil pump motor; The time limit switch includes a first time relay and a second time relay; When the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is normal, the first time relay generates the first descent start signal when receiving the action signal, and the first time relay continues to generate the first descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the first preset time length; when the power circuit monitoring module detects that the power circuit of the lifting oil pump motor is faulty, the second time relay generates the second descent start signal when receiving the action signal, and the second time relay continues to generate the second descent stop signal to keep the boarding bridge from descending when the continuous descent time of the boarding bridge exceeds the second preset time length.

9. The boarding bridge control method according to claim 8, characterized in that: The method further includes: When the number of descents or the descent height exceeds a threshold, the PLC control signal receiving module receives a control stop signal generated by the PLC control module of the boarding bridge control system; The descent control module controls and maintains the boarding bridge to stop descending according to the control stop signal.

10. The boarding bridge control device is characterized in that: include: memory and processor; The memory is used to store program code; A processor is used to call the program code to execute the boarding bridge control method described in claim 8 or 9.

11. Boarding bridge, characterized in that, The boarding bridge control circuit comprises the boarding bridge control circuit according to any one of claims 1 to 7.

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