Bridge load 400Hz power supply charging cable protection device

Abstract

The utility model discloses a bridge load 400Hz power supply charging cable protection device which is characterized in that a cable recovery in-place detection device is connected to a relay through a circuit, and the relay is connected with a cable recovery in-place indicating lamp; the unlocking shielding device is connected with the time relay and the control relay; the emergency processing device is connected with the bypass switch through an unlocking button and used for relieving interlocking protection under the condition that the cable cannot be recycled, and it is ensured that the boarding bridge can move normally. The detection limit switch is installed in the cable winch and used for detecting the winding and unwinding state of a cable, and the relay is connected with the stroboscopic indicator lamp to indicate the state of the cable. And the bypass switch is connected with the circuit and is used for bypassing the cable for recovery detection in emergency so as to ensure the normal operation of the boarding bridge.

Description

Technical Field

[0001] This invention relates to a bridge-mounted 400Hz power charging cable protection device, belonging to the field of airport power supply technology. Background Technology

[0002] With the development of the civil aviation industry and the increasing frequency of flights, the demands on airport ground service efficiency are also rising. One key requirement is that aircraft need to draw power from external sources while on the ground to maintain the normal operation of various equipment, typically achieved through a bridge-mounted 400Hz power system. This system provides stable power support while the aircraft is parked, avoiding the high costs and environmental pollution associated with using the aircraft's own APU (Auxiliary Power Unit). However, in practice, the reliability and safety of this system still need improvement, particularly in preventing cable damage to the aircraft.

[0003] The bridge-mounted 400Hz power system was designed to simplify ground operations and reduce aircraft fuel consumption. This system typically includes a fixed power unit connected via cable to a socket on the aircraft. It also features an interlocking device that theoretically locks the passenger boarding bridge when the power cable is connected to the aircraft, preventing it from moving and thus protecting the aircraft from damage if the cable breaks or the bridge is repositioned during departure preparations.

[0004] However, despite the aforementioned protective measures, several accidents have indeed occurred in practice due to improper cable management. These accidents not only affected normal flight operations and increased maintenance costs but also negatively impacted the airline's reputation. The main reasons for this are twofold: a lack of real-time monitoring of cable conditions and a lack of diversity in operational procedures.

[0005] First, the current system lacks real-time tracking of the power cable status. This means that if an abnormality occurs during cable use, such as jamming or tangling, ground staff will find it difficult to detect and take immediate action. This lag could lead to the cable being pulled on the aircraft under stress, causing physical damage. Furthermore, due to the lack of an effective early warning mechanism, staff often only become aware of the problem after it has already occurred, undoubtedly increasing the probability of accidents.

[0006] Secondly, while the "bridge first, power later" operating mode aims to reduce the risk of cables being pulled, it doesn't fundamentally solve the problem. This sequence relies on manual judgment and execution; operator error or equipment malfunction could result in cables being forcibly pulled before they are fully detached. More seriously, this mode limits operational flexibility, especially in emergencies where rapid aircraft evacuation could be delayed by waiting for power to be disconnected. Utility Model Content

[0007] The purpose of this invention is to provide a bridge-mounted power supply charging cable protection device, focusing on the charging cable of a 400Hz bridge-mounted power supply. It retains the two sets of interlocking protection functions inherent in the bridge-mounted power supply itself and adds a new interlocking function for ensuring the charging cable is properly retracted. (If the cable is not properly retracted, the boarding bridge cannot move; if it is properly retracted, the boarding bridge can move.)

[0008] To meet the needs of protection, this disclosure provides both "bridge first, then power" and "power first, then bridge" protection modes, thus overcoming the limitations of the single protection mode in existing technologies.

[0009] To achieve the above objectives, the technical solution of this utility model is as follows: A bridge-mounted 400Hz power charging cable protection device, comprising:

[0010] The cable recovery detection device is installed inside the bridge-mounted 400Hz power charging cable winch to detect whether the cable has been recovered in place.

[0011] The cable retraction status indicator is installed on the passenger boarding bridge control panel to indicate the cable retraction status. A green light indicates that the cable has been retracted in place, and a red light indicates that the cable has not been retracted in place.

[0012] The unlocking shielding device is installed on the passenger boarding bridge control panel and the bridge-mounted 400Hz power supply control panel. In the power-first-then-bridge mode, it is used to release the cable retraction in place interlock protection.

[0013] An emergency handling device, accessible via an unlock button or bypass switch, allows the boarding bridge to be moved in case the cable cannot be retracted;

[0014] The circuit connection structure is as follows: the cable retraction detection device is connected to the relay through the circuit, and the relay is connected to the cable retraction status indicator light. When the cable is detected to be retracted, the green light is triggered; when the cable is not retracted, the red light is triggered.

[0015] The unlocking shielding device is connected to the time relay and the control relay. After pressing the unlock button, the interlock protection is released through the relay control, allowing the boarding bridge to move for 4 minutes.

[0016] The emergency handling device is connected to the bypass switch via an unlock button, which is used to deactivate the interlock protection in case the cable cannot be retracted, ensuring that the boarding bridge can move normally.

[0017] The detection limit switch is installed inside the bridge-mounted 400Hz power charging cable winch to control the cable winding and unwinding status. The relay is connected to the flashing indicator light to indicate the status of the cable.

[0018] The bypass switch is connected to the circuit and is used to bypass cable recovery detection in emergency situations, ensuring the normal operation of the boarding bridge.

[0019] Furthermore, the cable recovery detection device includes a micro-limit switch and a triggering device installed inside the winch, used to detect whether the cable has been recovered in place, and to trigger the corresponding indicator light to display the status through the circuit;

[0020] The unlocking and shielding device operates through the time relay and corresponding relay in the control cabinet of the passenger boarding bridge. After pressing the "unlock" button on the bridge-mounted 400Hz power supply control panel, the interlock protection state is released through circuit control for 4 minutes, allowing the boarding bridge to move.

[0021] The emergency handling device includes an "unlock" button on the bridge-mounted 400Hz power supply control panel and a "bypass" switch in the passenger boarding bridge control panel cabinet, which are used to manually deactivate the interlock protection via circuitry when the cable cannot be retracted.

[0022] The device also includes red and green flashing warning lights, which are connected by circuitry. When the cable is not fully retracted, the red flashing warning light illuminates, prohibiting the boarding bridge from moving; when the cable is fully retracted, the green flashing light illuminates, allowing the boarding bridge to move.

[0023] The device has a bypass switch connected via circuitry to ensure normal operation of the boarding bridge in case the charging cable winch fails and cannot be retrieved, or the bridge-mounted cable is fully retrieved but the protection device is damaged.

[0024] Furthermore, the circuit connection structure includes:

[0025] The connection between the limit switch and the relay is used to detect the cable retraction status and trigger the corresponding relay action;

[0026] The connection between the relay and the indicator light is used to control the display status of the indicator light via the relay after detecting the cable condition;

[0027] The connection between the unlocking shielding device and the time relay is used to control the release of the interlock protection state after the "unlock" button is pressed;

[0028] The connection between the emergency handling device and the bypass switch is used to manually deactivate the interlock protection in an emergency, ensuring the movement of the boarding bridge;

[0029] The circuit includes a detection limit switch, which is installed inside the bridge-mounted 400Hz power charging cable winch to control the cable winding and unwinding and protection status. When the drum starts, the display status of the flashing indicator light is controlled by a relay.

[0030] After the drum motor starts, the limit switch is used to detect the winding and unwinding status of the cable and trigger the corresponding relay operation to control the on / off state of the red or green strobe light to ensure the movement status of the boarding bridge.

[0031] The connection between the unlock button and the KT7902 time relay controls the boarding bridge to move within 4 minutes after unlocking. After the time expires, it automatically resets and enters the interlock protection state.

[0032] The beneficial effects of this utility model are as follows:

[0033] (1) This invention makes up for the shortcomings of the prior art and can effectively avoid the occurrence of the bridge-mounted 400Hz power charging cable damaging civil aircraft.

[0034] (2) The present invention is more adaptable to actual protection needs and has two protection modes: "bridge first, then power" and "power first, then bridge", which makes up for the single protection mode of the existing technology. Attached Figure Description

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 A schematic diagram of the control flow for the boarding bridge with the operating handle;

[0037] Figure 2 A schematic diagram illustrating the control process for the boarding bridge being unusable by operating the handle.

[0038] Figure 3 Control flowchart for the boarding bridge to approach the cabin when the bridge-mounted 400Hz power supply connection lock is working;

[0039] Figure 4 Control flowchart for the boarding bridge being moved away from the cabin when the bridge-mounted 400Hz power supply connection lock is in operation;

[0040] Figure 5 Electrical diagram for triggering time relays in cable protection devices;

[0041] Figure 6 Electrical main diagram for cable protection device;

[0042] Figure 7 Electrical diagram for the status indicator lights of the cable protection device;

[0043] Figure 8 This is a diagram of the working structure. Detailed Implementation

[0044] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0045] This embodiment proposes a bridge-mounted 400Hz power charging cable protection device to prevent damage to civil aircraft from the cable and to better meet on-site support requirements. The solution includes a cable retraction detection device, a cable retraction status indicator, a shielding unlocking device, and an emergency handling device.

[0046] The cable retraction detection device is installed inside the 400Hz power charging cable winch on the bridge. Due to the limited usable space inside the winch, a micro-limit switch and triggering device are designed at one end of the cable retraction guide. When the cable is retracted into place, a green trigger light (indicating retraction in place) illuminates. At this time, operating the handle of the passenger boarding bridge will allow the boarding bridge to move (e.g., ...). Figure 1 (As shown); if the cable is not retracted properly, the red light will illuminate, and the boarding bridge will not move when the control handle is operated (e.g. Figure 2 (As shown). Indicator lights are installed on the control panel of the passenger boarding bridge for easy viewing and operation by the operator.

[0047] In the "power first, bridge later" mode, the unlocking shielding device is installed on the passenger boarding bridge control panel and the bridge-mounted 400Hz power supply control panel. In aircraft maintenance or special circumstances, power is first supplied to the aircraft via the bridge-mounted 400Hz power supply, and the boarding bridge is interlocked and cannot be moved. At this time, pressing the "unlock" button on the bridge-mounted 400Hz power supply control panel triggers two time relays and corresponding relays in the passenger boarding bridge control panel, activating the shielded cable retraction interlock, the bridge-mounted 400Hz power supply connection interlock, and the bridge-mounted 400Hz power supply operation interlock, which lasts for 4 minutes. During these 4 minutes, the boarding bridge operator can operate the boarding bridge to dock with the aircraft door (e.g., ...). Figure 3 (As shown).

[0048] The emergency response device is activated via the "unlock" button on the bridge-mounted 400Hz power supply control panel or the "bypass" switch in the passenger boarding bridge control panel cabinet (e.g.) Figure 4 (As shown). In actual operation, if the charging cable retrieval fails and the cable cannot be retrieved in place, in order not to affect the normal operation of the flight, the cable can be laid down, and then the "unlock" button can be pressed or the "side-open" switch can be closed to allow the boarding bridge to be evacuated from the aircraft in a timely manner.

[0049] Time relays KT7901 and KT7902, intermediate relays KC7901, and the "bypass" switch are installed inside the electrical cabinet of the boarding bridge control panel. The "red strobe light," "green strobe light," and "careful operation" light are installed on the boarding bridge control panel, making it easy for operators / maintenance personnel to visually see the working status of the bridge-mounted 400Hz power supply and also facilitating maintenance personnel to activate the "bypass" switch.

[0050] Limit switch 1 and limit switch 2 are respectively installed inside the 400Hz power charging cable reel of the bridge, and are the main body for detecting whether the charging cable is released or retracted into place.

[0051] The "Unlock" button SB01 and the "Unlock Indicator" light are installed on the bridge-mounted 400Hz power supply operation panel, which makes it easy for ground operators to unlock the power charging cable in a timely manner and also allows them to visually see whether the charging cable is in the unlocked state.

[0052] The working principle diagram of the invention device is as follows: Figure 5 , Figure 6 , Figure 7 :

[0053] Limit switches 1 and 2 of the cable recovery detection device are connected to the circuit. Figure 6 According to the I1.1 function module of the PLC, if any power charging cable is not properly retracted, the boarding bridge will not be able to move normally. Figure 7 The "red flashing light" and "operate with caution" light will illuminate, while the "green flashing light" will turn off. Only when all power charging cables are retracted into place can the boarding bridge move normally, at which point the "green flashing light" will illuminate, and the "red flashing light" and "operate with caution" light will turn off.

[0054] Unlock shielding device Figure 5 When the "Unlock" button SB01 is pressed, it triggers the time relays KT7901 and KT7902 to operate, which are then connected to the circuit. Figure 6 The interlocking function of PLC function modules I1.1, I12.0, and I12.1 is disabled to allow the boarding bridge to move normally; and to enable... Figure 7 The green strobe light is on and the red strobe light is off.

[0055] The emergency handling device is connected to a bypass switch via an "unlock" button. This allows the interlock protection to be released in case the cable cannot be retracted, ensuring the boarding bridge can move normally. The function of the "unlock" button has been described above; when the bypass switch is closed, it disables the interlock protection. Figure 6 Limit switch 1 and limit switch 2 of the cable recovery detection device.

[0056] The hardware of this implementation (see) Figure 5 and Figure 6 ): 1. Limit switches 1 and 2; 2. Time relays KT7901 and KT7902 (OMRON H3CR-A 100-240VAC, select "D" system); 3. Illuminated unlock button SB01; 4. Relay KC7901 (SCHNEIDER RXM2LB2BD DC24V); 5. Red and green flashing warning lights; 6. Bypass switch; 7. Limit switch stop block; 8. Limit switch mounting plate.

[0057] When the charging cable is not fully retracted, a red flashing warning light illuminates, and the boarding bridge cannot move. When the charging cable is fully retracted, a green flashing light illuminates, and the boarding bridge can move normally (e.g., ...). Figure 3 (As shown).

[0058] When the bridge-mounted 400Hz power cable is connected to the aircraft charging port and in operation, the green strobe light on the control panel will turn red, indicating that the boarding bridge is in an interlocked state and the handle cannot drive the boarding bridge. After pressing the unlock button, the time-delay relay will activate, and the boarding bridge will be released from its interlocked state within 4 minutes. The red strobe light will turn off, and the green strobe light will turn on, at which point the boarding bridge can move normally. After 4 minutes, the time-delay relay will reset, and the boarding bridge will re-enter the interlocked state and will be unable to move.

[0059] In addition, the device is equipped with a bypass system to handle situations such as sudden failure of the charging cable winch or damage to components in the cable protection device. In these cases, simply closing the bypass switch will allow the operating handle to drive the boarding bridge, ensuring uninterrupted flight operations.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any transformations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A bridge-mounted 400Hz power charging cable protection device, characterized in that, include: The cable recovery detection device is installed inside the bridge-mounted 400Hz power charging cable winch to detect whether the cable has been recovered in place. The cable retraction status indicator is installed on the passenger boarding bridge control panel to indicate the cable retraction status. A green light indicates that the cable has been retracted in place, and a red light indicates that the cable has not been retracted in place. The unlocking shielding device is installed on the passenger boarding bridge control panel and the bridge-mounted 400Hz power supply control panel. In the power-first-then-bridge mode, it is used to release the cable retraction in place interlock protection. An emergency handling device, which is an unlock button or bypass switch, is used to allow the boarding bridge to move if the cable cannot be retracted; The specific circuit connection structure is as follows: The cable recovery detection device is connected to the PLC function module via a circuit. The unlocking shielding device connects the function points of the trigger time relay and the PLC function module via a circuit connection. The emergency handling device is connected to the bypass switch via an unlock button, which is used to deactivate the interlock protection in case the cable cannot be retracted, ensuring that the boarding bridge can move normally; the bypass switch is closed to detect the cable retraction in place.

2. The bridge-mounted 400Hz power charging cable protection device as described in claim 1, characterized in that, The cable recovery detection device includes a micro-limit switch and a triggering device installed in the winch, used to detect whether the cable has been recovered in place and to trigger the corresponding indicator light to display the status through the circuit; the connection between the micro-limit switch and the relay is used to detect the cable recovery status and trigger the corresponding relay to act; the connection between the relay and the indicator light is used to control the display status of the indicator light through the relay after the cable status is detected.

3. The bridge-mounted 400Hz power charging cable protection device as described in claim 1, characterized in that, The unlocking and shielding device operates through the time relay and corresponding relay in the passenger boarding bridge control panel. After pressing the unlock button on the bridge-mounted 400Hz power supply control panel, the interlock protection state is released for 4 minutes through circuit control, allowing the boarding bridge to move.

4. The bridge-mounted 400Hz power charging cable protection device as described in claim 1, characterized in that, The emergency handling device includes an unlock button located on the bridge-mounted 400Hz power supply control panel and a bypass switch inside the passenger boarding bridge control panel cabinet, used to manually deactivate the interlock protection via circuitry when the cable cannot be retracted; the unlock button is connected to a time relay to control the boarding bridge to be movable within 4 minutes after unlocking.

5. The bridge-mounted 400Hz power charging cable protection device as described in claim 1, characterized in that, The device also includes red and green flashing warning lights, which are connected via a relay circuit. When the cable is not fully retracted, the red flashing warning light illuminates, prohibiting the boarding bridge from moving; when the cable is fully retracted, the green flashing light illuminates, allowing the boarding bridge to move.

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