A kind of jib lift truck safety construction is prevented from leaking electricity detection protection system and method

Abstract

The application discloses a safety construction anti-creeping detection protection system and method for a boom truck, the system comprising a real-time intelligent sensing device and a rapid isolation protection device, the sensing device detects electromagnetic and thermal signals through multiple sensors and outputs a warning signal through a data processing module for risk assessment, the rapid isolation protection device comprises equipotential, physical and foam arc prevention isolation devices, and is also provided with an audible and visual alarm and a vehicle control module. The method comprises the steps of initialization, real-time monitoring, risk determination, graded response, rapid isolation protection and system reset, realizes accurate detection and graded protection of the creeping risk, and effectively guarantees the anti-creeping safety of the boom truck in aerial work.

Description

Technical Field

[0001] This invention relates to the field of leakage current detection technology, specifically to a leakage current detection and protection system for safe construction of articulated boom lifts. Background Technology

[0002] With the rapid development of urban construction and infrastructure maintenance, articulated boom lifts (aerial work platforms) are widely used in construction, fire protection, power, landscaping and other high-altitude operations due to their excellent flexibility and accessibility. However, their working environment is becoming increasingly complex, especially in densely populated urban areas, industrial plants or old urban areas, where various power cables are often densely packed in the work space. Many cables are damaged or exposed due to age, insulation aging or construction accidents, forming a hidden and deadly source of leakage hazard.

[0003] Articulated boom lifts typically use rubber tires and hydraulic outriggers, resulting in a high overall insulation resistance to ground. When operators are manipulating the equipment at height, if the metal boom or vehicle body accidentally comes into contact with a damaged live cable, the current cannot form an effective circuit to the ground, and the vehicle's overall potential will instantly rise to the phase line voltage. If the operator is inside the platform, there is no immediate fatal danger because their body parts are at approximately the same potential. However, if their body simultaneously contacts both the platform and an external grounded object (such as a building's steel structure, tree branches, or a wall), or if a person on the ground accidentally touches the live vehicle body, the extremely high contact voltage and step voltage will generate a potentially fatal electric shock current, causing serious personal injury or death.

[0004] Currently, protective measures against such problems have significant shortcomings and limitations:

[0005] 1. Reliance on manual inspection and subjective experience: Current safety regulations mainly rely on on-site safety inspections before construction and operators' visual observation. However, in complex environments, high-altitude visibility is limited, damaged cables are extremely well hidden and difficult to detect with the naked eye, making the reliance on subjective experience very strong and posing a huge safety risk.

[0006] 2. Limitations of Passive Residual Current Devices (RCDs): Although vehicles can be equipped with residual current devices (RCDs), their function is limited to protecting the vehicle's electrical circuits themselves. When the entire vehicle is energized, the RCD cannot detect the fault because a current leakage circuit cannot be formed, and it will not trigger the trip protection, rendering it ineffective.

[0007] 3. Lack of systematicness and intelligence: Existing technical solutions are all isolated, passive or post-event protection. No solution can actively, in real time and continuously monitor the electric field anomalies in the space around the vehicle and link with the vehicle control module to achieve early warning, deceleration and even ultimate safety protection.

[0008] Therefore, existing technologies cannot provide effective, proactive, and reliable safety guarantees for workers operating at heights in complex electromagnetic environments, and there is an urgent need for an integrated and intelligent dedicated solution. Summary of the Invention

[0009] To address the aforementioned issues, this invention provides a leakage current detection and protection system and method for safe operation of articulated boom lifts, enabling accurate detection and graded protection against leakage current risks, and effectively ensuring leakage current safety during high-altitude operations of articulated boom lifts.

[0010] The technical solution adopted by this invention to solve its technical problem is:

[0011] In the first aspect, this application provides a leakage current detection and protection system for safe construction of a boom lift, including a real-time intelligent sensing device 17 and a rapid isolation protection device;

[0012] The real-time intelligent sensing device 17 is used to detect electromagnetic and thermal signals in the working environment of the articulated boom lift, and outputs corresponding warning level signals after multi-source data fusion and risk assessment.

[0013] The rapid isolation protection device includes an equipotential isolation device, a physical isolation device, and a foam arc-prevention isolation device, all of which are electrically connected to the signal output terminal of the real-time intelligent sensing device 17. The rapid isolation protection device is linked with the real-time intelligent sensing device 17 and performs graded protection actions of equipotential isolation, physical isolation, and foam arc-prevention isolation according to the warning level signal, so as to realize the leakage current safety protection for the workers.

[0014] In some possible implementations, the real-time intelligent sensing device 17 includes an electromagnetic field sensor 18, an electric field sensing sensor 19, and an infrared thermal imager 20.

[0015] The electromagnetic field sensor 18 serves as the main detector and is used to detect electromagnetic wave signals of 300MHz-3GHz radiated by partial discharge from the damaged cable.

[0016] The electric field sensing sensor 19 serves as an auxiliary detector, used to sense 50 / 60Hz power frequency electric field signals, and is fused with data from the electromagnetic field sensor 18 to distinguish between background electromagnetic noise and cable discharge characteristics.

[0017] The infrared thermal imager 20 is used to assist in verification, detect local overheating at leakage points of charged conductors (such as damaged charged cables), and image them.

[0018] In some possible implementations, the real-time intelligent sensing device 17 further includes a data processing module, which is electrically connected to the electromagnetic field sensor 18, the electric field sensing sensor 19, and the infrared thermal imager 20.

[0019] The data processing module performs multi-source data fusion and risk assessment steps, including: extracting and fusion analysis of the detection data, and outputting early warning level signals.

[0020] In some possible implementations, the equipotential bonding device includes a lower metal cage 1, an upper metal cage 2, a support rod 3, a retractable cylinder 8, a grounding connector 6, a vacuum switch 34, a grounding metal post 35, a cable reel 7, a hook 40, a lower support block 37 for the support rod, an insert-type locking pin 38, and an inner support block 39 for the locking pin. The lower metal cage 1 and the upper metal cage 2 are connected to the retractable cylinder 8 via the support rod 3. The lower support block 37 is provided at the lower end of the support rod 3. The insert-type locking pin 38 is located below the lower support block 37 to support it. An inner support block 39 is provided inside the insert-type locking pin 38. The inner support block 39 and the insert-type locking pin 38 are connected by a weld point. The take-up reel 7 is located inside the work platform, such as on or around the cage. The take-up reel 7 is equipped with a drive motor and a winding wheel, and the worker's safety belt is wound around the winding wheel. The cage has a hook 40 inside, and the worker hooks the safety belt onto the hook 40 after entering the work platform. The grounding metal post 35 is used for burying in the ground for grounding. The grounding metal post 35 is connected to one end of the vacuum switch 34 through a conductor along the boom of the articulated boom lift. The other end of the vacuum switch 34 is connected to one end of the grounding connector 6, and the other end of the grounding connector 6 is connected to the lower metal cage 1. The last section of the boom 33 of the articulated boom lift is a high-strength composite material insulated boom, which electrically isolates the work platform from the main structure of the vehicle body.

[0021] In some possible implementations, the physical isolation device includes a forward isolation push rod 14, a lateral isolation push rod 15, a forward telescopic rod 10, a lateral telescopic rod 16, a first explosion generator 24, an isolation rod piston 23, and a rearward piston 25; the forward isolation push rod 14 is movably fitted inside and adapted to the forward telescopic rod 10, and the lateral isolation push rod 15 is movably fitted inside and adapted to the lateral telescopic rod 16; the first explosion generator 24 contains gunpowder and an igniter, and the power output end of the first explosion generator 24 is connected to the isolation rod piston 23 and the rearward piston 25 respectively. When the first explosion generator 24 is triggered, the instantaneous thrust generated by the combustion of gunpowder pushes the isolation rod piston 23 forward along the axial direction. Simultaneously, the isolation rod piston 23 drives the forward isolation push rod 14 to extend forward rapidly along the guide direction of the forward telescopic rod 10, and the lateral isolation push rod 15 to extend to both sides along the guide direction of the lateral telescopic rod 16. At the same time, it pushes the rearward piston 25 to move backward. The rear side of the rearward piston 25 is provided with a reserved air space, which is connected to the upper space of the support block 37 under the inner support rod of the shrink cylinder 8, and can generate airflow to impact and break the weld point.

[0022] In some possible implementations, the foam arc-prevention isolation device includes an ejector foam generating material 27, an overflow foam generating material 31, a first sealing plate 26, a second sealing plate 28, a third sealing plate 30, a second explosion generator 29, a linkage rope 32, and a foam outlet 13; the first sealing plate 26 is disposed at the front end of the ejector foam generating material 27, and the second sealing plate 28, the second explosion generator 29, and the third sealing plate 30 are sequentially disposed between the ejector foam generating material 27 and the overflow foam generating material 31; one end of the linkage rope 32 is connected to the first sealing plate 26, the second explosion generator 28, and the third sealing plate 30. A sealing plate 26 is fixedly connected, and the other end passes through both sides of the second explosion generator 29 in sequence, and is fixedly connected to the second sealing plate 28 and the third sealing plate 30 respectively; the second explosion generator 29 can blast open the first sealing plate 26 and push it to drive the second sealing plate 28 and the third sealing plate 30 to move, thereby destroying the sealing of the overflow foam generating material 31; the foam outlet 13 is connected to the discharge end of the overflow foam generating material 31, and can be set on the front, left and right sides of the working platform; the spray foam generating material 27 is a polyurethane insulating growable foam material.

[0023] In some possible implementations, the system further includes an audible and visual alarm module and a vehicle control module. The audible and visual alarm module includes a speaker 21 and an alarm light 22, both of which are configured in the operation-related areas of the articulated boom lift, such as in the cab and boom basket platform of the articulated boom lift, respectively. The vehicle control module is electrically connected to the hydraulic control system of the articulated boom lift and can control the boom movement according to the warning level signal of the real-time intelligent sensor device 17.

[0024] Secondly, this application provides a method for detecting and protecting against leakage current in the safe operation of a boom lift truck, implemented using the aforementioned system, and comprising the following steps:

[0025] S1. System initialization: Bury the grounding metal post 35 into the soil of the work area to complete the grounding;

[0026] S2. Real-time monitoring and sensing: Electromagnetic field sensor 18, electric field induction sensor 19, and infrared thermal imager 20 detect corresponding signals respectively, and transmit all detected data to the data processing module; for example, electromagnetic field sensor 18 detects electromagnetic wave signals of 300MHz-3GHz in real time, electric field induction sensor 19 senses 50 / 60Hz power frequency electric field signals in real time, and infrared thermal imager 20 detects and images the thermal signals of the working environment in real time, and each sensor transmits the detected data to the data processing module;

[0027] S3. Risk assessment and early warning level determination: The data processing module performs feature extraction and fusion analysis on the detection data, calculates the hazard confidence level by combining DS evidence theory or confidence rules, and determines and outputs different early warning level signals based on the combined characteristics of multi-sensor abnormal signals and the hazard confidence level value.

[0028] S4. Tiered linkage response: Based on the warning level signal, a gradient linkage response action is executed. As the warning level is raised, the protective intervention action is strengthened simultaneously. The highest level warning, such as the level four warning, triggers a rapid isolation and protection device for full-dimensional protection.

[0029] S5. Rapid Isolation Protection: After the highest level of warning is triggered, the equipotential isolation device, physical isolation device, and foam anti-arc isolation device of the rapid isolation protection device are activated simultaneously.

[0030] S6. System Reset: After the danger is eliminated, manually unlock the system, restore all components of the rapid isolation and protection device to their initial state, restart the real-time intelligent sensing device 17, and restore the articulated boom lift to normal operation.

[0031] In some possible implementations, in step S5, the equipotential isolation device, physical isolation device, and foam arc-prevention isolation device of the rapid isolation protection device are activated simultaneously to complete the protection of workers, physical isolation of live conductors, and insulating foam isolation.

[0032] S5.1 Equipotential Isolation: The gas flow generated by the first explosion generator 24 of the physical isolation device impacts and breaks the weld joint, the lower support block 37 of the support rod moves downward, and the lower metal cage 1 and the upper metal cage 2 close together to form a complete Faraday cage; at the same time, the vacuum switch 34 closes, grounding the work platform through the grounding connector 6, the vacuum switch 34, and the grounding metal post 35 to form an equipotential body; the drive motor of the take-up reel 7 starts to drive the winding wheel to wind up the safety belt, quickly pulling the workers to the safe area behind the cage;

[0033] S5.2 Physical Isolation: The first explosion generator 24 is triggered to generate instantaneous thrust, which pushes the isolation rod piston 23 to drive the forward isolation push rod 14 to extend rapidly forward along the forward telescopic rod 10, and the lateral isolation push rod 15 to extend to both sides along the lateral telescopic rod 16. The mechanical thrust of the push rod directly pushes the damaged cable and live conductor near the work platform away from the work platform to a safe distance, thus achieving physical isolation.

[0034] S5.3 Foam Arc Isolation: The second explosion generator 29 blows open the first sealing plate 26, spraying the ejected foam generating material 27 onto the exposed live conductor. The impact force further pushes the cable away and forms an insulating foam layer on the cable surface. At the same time, the first sealing plate 26 moves the second sealing plate 28 and the third sealing plate 30 through the linkage pull rope 32, destroying the sealing of the overflow foam generating material 31. After the foaming material comes into contact with the air, it continuously overflows from the foam outlet 13 and foams, forming a foam isolation wall between the working platform and the construction area.

[0035] The present invention discloses a leakage current detection and protection system and method for safe construction of articulated boom lifts, which specifically solves the technical pain points of existing articulated boom lifts during high-altitude operations, such as delayed leakage current detection, passive protection, and susceptibility to electromagnetic interference and misjudgment. It provides an integrated, intelligent, and comprehensive solution for leakage current safety in high-altitude operations, and has the following significant advantages compared to existing technologies:

[0036] (1) Improved detection accuracy and reduced false alarm and false negative rates. The system is equipped with multiple sensors, including UHF, power frequency electric field and infrared thermal imaging, for collaborative detection. It combines feature extraction and fusion analysis to achieve multi-dimensional signal analysis, which can accurately distinguish between leakage discharge signals from damaged cables and background electromagnetic interference from drones, electrical equipment, etc. At the same time, it uses thermal signals to assist in verifying leakage points, thus avoiding the problem of false and false alarms from single sensor detection at the source and improving the accuracy of leakage risk identification.

[0037] (2) Early warning is graded to achieve precise matching of protective actions. The data processing module outputs multi-level early warning signals and matches them with gradient linkage response actions. From background recording, sound and light warning, equipment speed reduction to emergency shutdown, the intensity of protective intervention increases with the risk level. This not only avoids meaningless work interruption, but also enables rapid response in high-risk situations, achieving the operational requirement of "minimizing intervention and maximizing protection".

[0038] (3) Comprehensive protection, constructing multiple safety barriers against electric shock. The rapid isolation protection device integrates equipotential, physical, and foam arc-proof triple isolation structures, which are activated simultaneously when the highest level of warning is issued: the Faraday cage forms an equipotential body to fundamentally prevent electric shock to personnel, the mechanical force of the push rod is used to quickly push away the live conductor, and then the insulating foam forms a physical isolation wall, blocking the risk of leakage from multiple dimensions such as personnel protection, hazard source isolation, and work area shielding, with comprehensive and reliable protection effect.

[0039] (4) System linkage to achieve integrated control of detection and protection. The real-time intelligent sensing device is deeply linked with the rapid isolation protection device, the sound and light alarm module and the vehicle hydraulic control system. The detection, judgment, early warning and protection process is completed automatically without manual intervention. This effectively solves the problem of traditional protection relying on manual inspection and slow response, and greatly improves the emergency response efficiency when facing the danger of leakage in high-altitude operations.

[0040] (5) The structure is highly adaptable and compatible with the modification of existing articulated boom lifts. The structure of each device in the system is reasonably laid out. The cable retractor, sensors, alarm modules, etc. can be flexibly configured in the relevant areas of the articulated boom lift operation. The design of the end section insulated boom, grounding structure, etc. does not require large-scale modification of the vehicle body. It is compatible with the installation and use of different models of articulated boom lifts and has strong engineering practicality and promotion value.

[0041] (6) The operation process is simple and the system is easy to reset. The detection and protection method is achieved through only six core steps: initialization, real-time monitoring, risk assessment, graded response, rapid isolation and system reset. The operation logic is clear. After the danger is eliminated, the device can be quickly restored to its initial state and the system can be restarted manually. This does not affect the subsequent normal operation of the boom lift and takes into account both operation safety and construction efficiency.

[0042] In summary, this invention achieves proactive detection, intelligent judgment, graded early warning, and rapid isolation of leakage risks from damaged cables. It completely solves many shortcomings of existing articulated boom lifts for high-altitude operations from a technical perspective, significantly improves the safety of articulated boom lifts in complex cable-dense environments, and provides reliable technical protection for the life safety of high-altitude workers. Attached Figure Description

[0043] Figure 1 This is a flowchart of a leakage current detection and protection method according to an embodiment of this application.

[0044] Figure 2 This is a three-dimensional schematic diagram of a leakage current detection and protection system according to an embodiment of this application. Figure 1 .

[0045] Figure 3 This is a schematic diagram on the right side of an embodiment of the leakage current detection and protection system of this application.

[0046] Figure 4 This is a front view of a leakage current detection and protection system according to an embodiment of this application.

[0047] Figure 5 for Figure 4 Diagram of the cross-section at point AA.

[0048] Figure 6 This is a three-dimensional schematic diagram of a leakage current detection and protection system according to an embodiment of this application. Figure 2 .

[0049] Figure 7 for Figure 6 Enlarged diagram of point B in the image.

[0050] Figure 8 This is a partial structural diagram of an equipotential isolation device in one embodiment of this application.

[0051] Figure 9 This is a schematic diagram of the internal structure of the shrink tube in one embodiment of this application.

[0052] The components include: 1. Lower metal cage; 2. Upper metal cage; 3. Support rod; 4. Metal door; 5. Connector; 6. Grounding connector; 7. Cable retractor; 8. Shrink drum; 9. Barrier; 10. Forward telescopic rod; 11. High-pressure gas duct; 12. Foam generator; 13. Foam outlet; 14. Forward isolation push rod; 15. Lateral isolation push rod; 16. Lateral telescopic rod; 17. Real-time intelligent sensing device; 18. Electromagnetic field sensor; 19. Electric field induction sensor; 20. Infrared thermal imager; 21. Speaker. 22. Warning light; 23. Isolation rod piston; 24. First explosion generator; 25. Rear piston; 26. First sealing plate; 27. Spray-type foam generating material; 28. Second sealing plate; 29. ​​Second explosion generator; 30. Third sealing plate; 31. Overflow-type foam generating material; 32. Linkage rope; 33. Last section boom; 34. Vacuum switch; 35. Grounding metal post; 36. Secondary section boom; 37. Support block under the strut; 38. Insert-type locking pin; 39. Inner support block of the locking pin; 40. Hook. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present application, the technical solution of the present application will be further described in detail below with reference to the embodiments and accompanying drawings.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0056] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0057] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linked," and "socketing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0059] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0060] The following will refer to Figures 1-9 This application describes a leakage current detection and protection system and method for safe construction of articulated boom lifts, as provided in its embodiments. The system includes a real-time intelligent sensing device and a rapid isolation and protection device.

[0061] Among them, the real-time intelligent sensing device may include electromagnetic field sensors, electric field induction sensors (power frequency electric field sensors) and infrared thermal imagers (infrared thermal imaging sensors).

[0062] An electromagnetic field sensor is used as the main detector. Damaged cables emit ultra-high frequency electromagnetic waves of 300MHz-3GHz due to partial discharge, which can detect the discharge phenomenon. The electromagnetic field sensor can be an ultra-high frequency electromagnetic field sensor to detect the 300MHz-3GHz electromagnetic wave signal radiated by partial discharge of damaged cables.

[0063] An electric field induction sensor serves as an auxiliary detector. It is used to sense 50 / 60Hz power frequency electric field signals, and a broadband electric field induction sensor can be employed. Data fusion between the electric field induction sensor and the electromagnetic field sensor can effectively distinguish between background electromagnetic noise and cable discharge characteristics, significantly reducing the false alarm rate.

[0064] Infrared thermal imagers are used for auxiliary verification. Leakage points in charged conductors are often accompanied by localized overheating, which can be verified by imaging with infrared sensors.

[0065] In some embodiments, two electromagnetic field sensors can be installed, symmetrically arranged on the left and right sides of the front end of the articulated boom lift platform, with the detection direction covering a 360° range in front of and to the side of the platform. The installation height is 0.8-1.5m (e.g., 1.2m) above the bottom surface of the platform to ensure no blind spots in the detection of discharge signals from damaged cables in the surrounding area.

[0066] The electric field sensing sensor can be placed at the center of the work platform, with the detection surface horizontally upward, covering the power frequency electric field signal within a radius of 3-8m (e.g., 5m) around the work platform, forming a detection complement to the ultra-high frequency sensor;

[0067] Infrared thermal imagers can be placed on the front of the top of the work platform, with the lens facing the front and bottom of the work platform. The detection angle is 90°-150° (e.g., 120°). They can capture and image the local overheating phenomenon of leakage points in the work area in real time.

[0068] The data processing module can be located inside the cab of the articulated boom lift and connected to each sensor via shielded wires to reduce the impact of electromagnetic interference on data transmission.

[0069] The working principle and detection method of the detection system may include:

[0070] 1. Feature Extraction: Real-time filtering, amplification, and feature extraction are performed on ultra-high frequency electromagnetic wave signals and electric field signals, specifically including: signal spectrum, amplitude, pulse count, and phase. The spectrum represents the signal frequency distribution, the amplitude represents the signal field strength, the pulse count represents the discharge frequency per unit time, and the phase represents the signal propagation path and the location of the signal source.

[0071] 2. Signal processing evaluation: Continuously perform fusion analysis on the intensity of ultra-high frequency electromagnetic wave signals, power frequency electric field signals, and infrared thermal signals.

[0072] By combining and analyzing multiple features, the system can accurately identify leakage discharge signals from damaged cables, effectively eliminating electromagnetic interference from non-electrical hazards.

[0073] In some embodiments, a weighted fusion analysis is performed on the intensity of ultra-high frequency electromagnetic waves, the intensity of power frequency electric field signals, and infrared thermal signals. For example, different weights are assigned to the detection data of ultra-high frequency electromagnetic waves detected by electromagnetic field sensor 18, power frequency electric field signals detected by electric field sensor 19, and infrared thermal signals detected by infrared thermal imager 20. For example, the basic weights are 60% for ultra-high frequency electromagnetic waves, 30% for power frequency electric field signals, and 10% for infrared thermal signals. The hazard confidence level is calculated by combining DS evidence theory or preset confidence rules, and a warning level signal is output. It can also detect the energized state of the work platform and output the highest level warning signal. For example, the hazard confidence level = (ultra-high frequency signal weight × ultra-high frequency signal normalized value) + (power frequency electric field signal weight × power frequency electric field signal normalized value) + (infrared thermal signal weight × infrared thermal signal normalized value). For example, the confidence thresholds and judgment rules corresponding to each warning level are as follows: Level 1 warning: hazard confidence < 30%; Level 2 warning: 30% ≤ hazard confidence < 60%; Level 3 warning: 60% ≤ hazard confidence < 95%; Level 4 warning (highest level): hazard confidence ≥ 95%, or if the work platform is found to be electrified, it is directly judged as a Level 4 warning.

[0074] In some embodiments, the fusion analysis corresponds to the following operating conditions:

[0075] Operating Condition 1: High-Risk False Alarm Scenario – Triggered by a Single UHF Electromagnetic Wave Signal. The sensor status and signal characteristics are shown in Table 1.

[0076] Table 1. Sensor Status and Signal Characteristics in High-Risk False Alarm Scenarios Triggered by a Single UHF Signal

[0077]

[0078] Decision steps of the fusion algorithm:

[0079] The algorithm detected a strong ultra-high frequency characteristic signal and initially judged it to be a "potential discharge".

[0080] However, the power frequency electric field signal and the data from the infrared sensor did not provide supporting evidence.

[0081] Based on the DS evidence theory or pre-set confidence rules, the confidence level of this scenario as "genuine danger" is low, while the confidence level of "interference" is high.

[0082] Conclusion: Such signal combinations typically originate from non-electrical hazards, such as:

[0083] Radio interference from drones and remote control equipment.

[0084] The spark plugs of a vehicle in the distance are interfering with the ignition.

[0085] Electromagnetic noise from other high-frequency electrical equipment.

[0086] Corresponding warning level: Level 1 warning.

[0087] System Actions: Events can be recorded in the background without triggering audible and visual alarms or restricting vehicle movement, thus avoiding unnecessary work interruptions.

[0088] Operating Scenario 2: High-Risk Confirmation Scenario – Co-triggered by UHF and power frequency electric field signals. The sensor status and signal characteristics are shown in Table 2.

[0089] Table 2 Sensor Status and Signal Characteristics of High-Risk Confirmation Scenarios Triggered by Co-triggered UHF and Broadband Electric Field Signals

[0090]

[0091] Decision steps of the fusion algorithm:

[0092] The algorithm identified that both UHF and power frequency electric field signals are of high intensity and that they are highly correlated in spatial location.

[0093] This is a classic "leakage current charged conductor" characteristic mode: it has both strong discharge (ultra-high frequency) and stable high voltage power supply (power frequency electric field).

[0094] Even if the infrared sensor does not trigger an alarm, the high degree of coordination between the first two sensors has enabled the system to calculate a "very high danger" scenario with a confidence level exceeding 95%.

[0095] Conclusion: A damaged live cable has been confirmed to exist nearby, posing an extremely high risk.

[0096] Corresponding warning level: Level II warning.

[0097] System actions:

[0098] Audible and visual alarm: Speaker alarm sound + alarm light flashing.

[0099] Vehicle control module linkage: Immediately reduce the speed at which the boom or vehicle moves in the dangerous direction.

[0100] If the system estimates the distance to be very close and continues to approach, a Level 3 warning will be triggered after a very short delay.

[0101] Operating Scenario 3: Extremely High Risk / Emergency Scenario – Full Sensor Collaborative Triggering, Sensor Status and Signal Characteristics are shown in Table 3:

[0102] Table 3. Sensor Status and Signal Characteristics in Extremely High-Risk Emergency Scenarios Triggered by All Sensors Collaboration

[0103]

[0104] Fusion algorithm decision steps:

[0105] All three sensors triggered alarms, and the signals all reached or approached the upper limit of their range.

[0106] The evidence from multiple sources is highly consistent, forming an irrefutable chain of evidence that indicates the vehicle is in an extremely dangerous critical state.

[0107] The algorithm instantly arrives at the highest level of risk confidence (100%) and determines that an accident may occur at any time.

[0108] Conclusion: The leakage has penetrated the core area of ​​the high-voltage leakage circuit. Immediate and rapid isolation and protection measures should be taken.

[0109] Corresponding warning level: Level III warning.

[0110] System actions:

[0111] Issue an emergency alarm with the highest decibel and light intensity.

[0112] The vehicle control module is linked and triggered:

[0113] Emergency Stop: Stops all hydraulic action and freezes the boom's current state.

[0114] The system is locked and awaits manual reset.

[0115] Operating Condition 4: Final Protection Against Electric Shock – Live-Line Detection of the Work Platform

[0116] The work platform was found to be electrified, triggering a Level 4 warning.

[0117] Triggering the rapid isolation protection device: Activating the vacuum switch, grounding the work platform, forming an equipotential body (Faraday cage), and protecting personnel safety.

[0118] Other protective measures that trigger rapid isolation protection devices.

[0119] Multi-level proactive early warning and coordinated control

[0120] Level 1 Warning (Audio and Visual Alarm): The system detects a risk and immediately issues a warning through speakers and alarm lights in the cab and boom basket platform.

[0121] Level 2 Warning (Tactile Feedback and System Slowdown): If the risk level increases or personnel continue to operate the vehicle in the dangerous direction, the system will slow down the construction platform by restricting its movement and trigger the alarm unit on the boom basket control panel to remind workers to limit the speed of the lifting vehicle in the dangerous direction.

[0122] Level 3 Warning (Emergency Braking): In extremely high-risk situations, such as when the estimated distance is less than the safety threshold, the system will trigger an automatic stop, halting all boom movements, locking the current state, and awaiting further action.

[0123] Level 4 Warning (Emergency Isolation): The moment the work platform is detected to be energized, the rapid isolation and protection device is activated immediately.

[0124] In some embodiments, the loudspeaker 21 and the warning light 22 include two sets, one set is arranged on the top of the outer side of the work platform and the other set is arranged on the top of the cab of the articulated boom lift, so that both the workers and the ground operators can receive the warning signal.

[0125] In some embodiments, the vehicle control module is located next to the hydraulic control system of the articulated boom lift and is electrically connected to the data processing module and the hydraulic valve group to achieve precise control of the boom's movement.

[0126] In some embodiments, the rapid isolation protection device includes an equipotential isolation device, a physical isolation device, and a foam arc-resistant isolation device.

[0127] In some embodiments, the equipotential bonding device includes a lower metal cage and an upper metal cage, which are connected by a support rod 3 and a contraction cylinder 8, such as Figure 9 As shown, the lower end of the support rod 3 is equipped with a lower support block 37, which is supported by an insert locking pin 38. This allows sufficient space between the lower and upper metal cages for normal construction. Workers wear safety belts when entering the work platform, which are attached to hooks 40. The retractor 7 is equipped with a motor that can pull workers from the front to the back during a level four warning, preventing direct contact with exposed wires. During a level four warning, a strong airflow can push the lower support block 37 downwards, causing the lower and upper metal cages to close together, forming a complete Faraday cage and an equipotential body, preventing workers from being electrocuted. Figure 9 As can be seen, the inner side of the insert-type locking pin 38 has a locking pin inner support block 39, and the two are connected by a weld point. Strong airflow can cause the lower support block 37 of the support rod to break the weld point downwards.

[0128] In some embodiments, the lower metal cage 1 can be fixed to the bottom surface of the work platform, and the upper metal cage 2 can be suspended around the top of the work platform by the support rod 3 and the retractable cylinder 8; the grounding metal column 35 can be matched with the hydraulic outrigger of the articulated boom lift, the cable retractor 7 can be fixed to the inner wall of the rear side of the work platform, and four hooks 40 can be set and evenly arranged around the inside of the cage.

[0129] A strong airflow is generated after being triggered by the first explosion generator of the physical isolation device. It is formed by the compression of the air space reserved behind it by the rear piston, and is conducted to the welding point through the communication path between this space and the upper space of the support block under the inner support rod of the shrink cylinder.

[0130] refer to Figure 8 In some embodiments, the equipotential isolation device also includes a grounding connector 6, a vacuum switch 34, and a grounding metal post 35. In addition, the last section of the boom 33 adopts a high-strength composite material insulated boom to electrically isolate the working platform from the main structure of the vehicle body with potential, so that the construction platform forms a highly conductive independent area. Before construction, the grounding metal post 35 should be buried in the ground in advance for grounding. It is connected to the vacuum switch 34 through a wire along the boom. One end of the grounding connector 6 is connected to the lower metal cage, and the other end is connected to the vacuum switch 34. When danger is detected, the platform is instantly grounded to form a "Faraday cage" and an equipotential body to protect personnel safety.

[0131] In some embodiments, the physical isolation device includes a forward isolation push rod 14 and a lateral isolation push rod 15 extending forward and laterally; the forward isolation push rod 14 extends forward to push nearby power lines forward, thereby moving them away from the work platform; the pushing force comes from the reference attachment. Figure 5 The first explosion generator 24 includes gunpowder and an igniter. After the explosion, it pushes the isolation rod piston 23 and the rearward piston 25 forward and backward, respectively. Behind piston 25 is a reserved space containing air, and this space is connected to the attached... Figure 9 The space above the center 37 can generate a strong airflow impact.

[0132] In some embodiments, the forward telescopic rod 10 and the forward isolation push rod 14 are arranged at the front center of the work platform, the lateral telescopic rod 16 and the lateral isolation push rod 15 are symmetrically arranged on the left and right sides of the work platform, and the first explosion generator 24 is built into the rear side inside the work platform.

[0133] In some embodiments, the foam arc-resistant isolation device refers to Figure 5The system includes a spray-type foam generating material 27 and an overflow-type foam generating material 31, separated by multiple sealing plates and a second explosion generator 29. The rear end of the overflow-type foam generating material 31 is sealed, and the front end of the spray-type foam generating material 27 is equipped with a first sealing plate 26. A linkage rope 32 connects the rear of the first sealing plate 26 to a second sealing plate 28 and a third sealing plate 30. When the second explosion generator 29 detonates, it blows open the first sealing plate 26, spraying the spray-type foam generating material 27 onto exposed electrical wires. The initial impact can blow the wires away from the work platform, and secondly, it can spray insulating, expandable foam material, such as polyurethane, onto the wires. This initially isolates the exposed wires. During the explosion, the first sealing plate 26 moves along with the second sealing plate 28 and the third sealing plate 30, breaking the seal of the overflow-type foam generating material 31. At this point, the internal foam material comes into contact with air, continuously overflowing from the foam outlet 13 and continuing to foam, forming a foam isolation wall between the work platform and the construction area, completing the final isolation.

[0134] In some embodiments, the ejector foam generating material 27 and the overflow foam generating material 31 are built into the bottom of the work platform. Foam outlets 13 are opened on the front, left and right sides of the work platform, with two outlets on each side, for a total of six outlets. The outlet height is 0.8m from the bottom surface of the work platform.

[0135] This solution's real-time intelligent sensing device makes decisions based on the confidence fusion of multi-source information, effectively distinguishing between interference and real danger. Response measures are precisely matched to the level of danger, achieving a smooth upgrade from "warning" to "deceleration" and then to "braking + isolation protection," realizing the system's "minimum intervention." The rapid isolation protection device can react quickly when the danger of electric shock actually occurs, protecting workers from multiple dimensions, including forming an equipotential body, physical push rod isolation, and ultimately forming an insulating foam wall to completely keep the danger out.

[0136] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A leakage current detection and protection system for safe construction of a boom lift truck, characterized in that, Includes real-time intelligent sensing devices (17) and rapid isolation and protection devices; The real-time intelligent sensing device (17) is used to detect electromagnetic and thermal signals in the working environment of the articulated boom lift, and outputs corresponding early warning level signals after multi-source data fusion and risk assessment. The rapid isolation protection device includes an equipotential isolation device, a physical isolation device, and a foam arc-proof isolation device, all of which are electrically connected to the signal output terminal of the real-time intelligent sensing device (17). The rapid isolation protection device is linked with the real-time intelligent sensing device (17) and performs graded protection actions of equipotential isolation, physical isolation, and foam arc-proof isolation according to the warning level signal, so as to realize the leakage protection safety of the workers.

2. The system according to claim 1, characterized in that, The real-time intelligent sensing device (17) includes an electromagnetic field sensor (18), an electric field sensing sensor (19), and an infrared thermal imager (20). The electromagnetic field sensor (18) serves as the main detector and is used to detect electromagnetic wave signals of 300MHz-3GHz radiated by partial discharge of the damaged cable. The electric field sensing sensor (19) serves as an auxiliary detector to sense 50 / 60Hz power frequency electric field signals and fuses the data with the electromagnetic field sensor (18) to distinguish background electromagnetic noise and cable discharge characteristics. The infrared thermal imager (20) is used to assist in verification, detect local overheating at leakage points of charged conductors, and image the phenomenon.

3. The system according to claim 2, characterized in that, The real-time intelligent sensing device (17) also includes a data processing module, which is electrically connected to the electromagnetic field sensor (18), the electric field sensing sensor (19), and the infrared thermal imager (20). The data processing module performs multi-source data fusion and risk assessment steps, including: extracting and fusion analysis of the detection data, and outputting early warning level signals.

4. The system according to claim 1, characterized in that, The equipotential isolation device includes a lower metal cage (1), an upper metal cage (2), a support rod (3), a retractable cylinder (8), a grounding connector (6), a vacuum switch (34), a grounding metal post (35), a take-up coil (7), a hook (40), a lower support block (37) on the support rod, an insert-type locking pin (38), and an inner support block (39) on the locking pin. The lower metal cage (1) and the upper metal cage (2) are connected to the retractable cylinder (8) via the support rod (3). A lower support block (37) is provided at the lower end of the support rod (3). An insert-type locking pin (38) is located below the lower support block (37) to support it. An inner support block (39) is provided inside the insert-type locking pin (38). The inner support block (39) and the insert-type locking pin are connected to the insert-type locking pin. The pin (38) is connected by a welding point; the take-up device (7) is located inside the working platform, and the take-up device (7) is equipped with a drive motor and a winding wheel. The safety belt of the operator is wound on the winding wheel; the cage is equipped with a hook (40), and the operator hangs the safety belt on the hook (40) after entering the working platform; the grounding metal post (35) is used to bury the ground and ground it. The grounding metal post (35) is connected to one end of the vacuum switch (34) through a wire along the boom of the articulated boom lift. The other end of the vacuum switch (34) is connected to one end of the grounding connector (6), and the other end of the grounding connector (6) is connected to the lower metal cage (1); the last section of the boom (33) of the articulated boom lift is a high-strength composite material insulated boom, which electrically isolates the working platform from the main structure of the vehicle body.

5. The system according to claim 1, characterized in that, The physical isolation device includes a forward isolation push rod (14), a lateral isolation push rod (15), a forward telescopic rod (10), a lateral telescopic rod (16), a first explosion generator (24), an isolation rod piston (23), and a rearward piston (25). The forward isolation push rod (14) is movably fitted inside the forward telescopic rod (10) and adapted to it. The lateral isolation push rod (15) is movably fitted inside the lateral telescopic rod (16) and adapted to it. The first explosion generator (24) is equipped with gunpowder and an igniter. The power output end of the first explosion generator (24) is connected to the isolation rod piston (23) and the rearward piston, respectively. (25) When the first explosion generator (24) is triggered, the instantaneous thrust generated by the combustion of gunpowder pushes the isolation rod piston (23) to move forward along the axial direction. The isolation rod piston (23) simultaneously drives the forward isolation push rod (14) to extend forward rapidly along the guide direction of the forward telescopic rod (10), and the lateral isolation push rod (15) to extend to both sides simultaneously along the guide direction of the lateral telescopic rod (16), while pushing the rear piston (25) to move backward. The rear side of the rear piston (25) is provided with a reserved air space, which is connected to the upper space of the support block (37) under the inner support rod of the shrink cylinder (8), and can generate airflow to impact and break the weld point.

6. The system according to claim 1, characterized in that, The foam arc-proof isolation device includes a spray-type foam generating material (27), an overflow-type foam generating material (31), a first sealing plate (26), a second sealing plate (28), a third sealing plate (30), a second explosion generator (29), a linkage rope (32), and a foam outlet (13); the first sealing plate (26) is located at the front end of the spray-type foam generating material (27), and the second sealing plate (28), the second explosion generator (29), and the third sealing plate (30) are arranged sequentially between the spray-type foam generating material (27) and the overflow-type foam generating material (31); the linkage rope (32) is located at the front end of the spray-type foam generating material (27), the second sealing plate (28), the second explosion generator (29), and the third sealing plate (30); 2) One end is fixedly connected to the first sealing plate (26), and the other end passes through both sides of the second explosion generator (29) and is fixedly connected to the second sealing plate (28) and the third sealing plate (30) respectively; the second explosion generator (29) can blast open the first sealing plate (26) and push it to move the second sealing plate (28) and the third sealing plate (30), thereby destroying the sealing of the overflow foam generating material (31); the foam outlet (13) is connected to the discharge end of the overflow foam generating material (31); the spray foam generating material (27) is a polyurethane insulating growable foam material.

7. The system according to claim 1, characterized in that, It also includes an audible and visual alarm module and a vehicle control module. The audible and visual alarm module includes a speaker (21) and an alarm light (22). The speaker (21) and the alarm light (22) are both located in the work-related area of ​​the articulated boom lift. The vehicle control module is electrically connected to the hydraulic control system of the articulated boom lift and can control the boom movement according to the warning level signal of the real-time intelligent sensor device (17).

8. A method for preventing leakage current during safe construction of a boom lift, implemented using the system described in any one of claims 1-7, characterized in that, Includes the following steps: S1. System initialization: Bury the grounding metal post (35) into the soil of the work area to complete the grounding; S2, Real-time monitoring and sensing: The corresponding signals are detected by the electromagnetic field sensor (18), the electric field induction sensor (19), and the infrared thermal imager (20), and all the detected data are transmitted to the data processing module. S3. Risk Assessment and Early Warning Level Determination: The data processing module performs feature extraction and fusion analysis on the detection data and outputs an early warning level signal; S4. Tiered linkage response: Execute gradient linkage response actions according to the warning level signal. When the warning level is raised, the protective intervention actions are strengthened simultaneously. S5. Rapid Isolation Protection: After the highest level of warning is triggered, the equipotential isolation device, physical isolation device, and foam anti-arc isolation device of the rapid isolation protection device are activated simultaneously. S6. System Reset: After the danger is eliminated, manually unlock the system, restore all components of the rapid isolation protection device to their initial state, restart the real-time intelligent sensing device (17), and restore the normal operation of the articulated boom lift.

9. The method according to claim 8, characterized in that, In step S5, the equipotential isolation device, physical isolation device, and foam arc-prevention isolation device of the rapid isolation protection device are activated simultaneously to perform: S5.1 Equipotential Isolation: The airflow generated by the first explosion generator (24) of the physical isolation device impacts and breaks the weld point, the support block (37) of the support rod moves downward, and the lower metal cage (1) and the upper metal cage (2) close together to form a complete Faraday cage; at the same time, the vacuum switch (34) closes, and the working platform is grounded through the grounding connector (6), the vacuum switch (34), and the grounding metal post (35) to form an equipotential body; the drive motor of the take-up device (7) starts to drive the winding wheel to wind up the safety belt, and quickly pulls the workers to the safe area behind the cage; S5.2 Physical isolation: The first explosion generator (24) triggers and generates instantaneous thrust, which pushes the isolation rod piston (23) to drive the forward isolation push rod (14) to extend rapidly along the forward telescopic rod (10), and the lateral isolation push rod (15) to extend to both sides along the lateral telescopic rod (16). The mechanical thrust of the push rod directly pushes the damaged cable and live conductor near the working platform away from the working platform at a safe distance, thus achieving physical isolation. S5.3, Foam Arc Isolation: The second explosion generator (29) blows open the first sealing plate (26) and sprays the ejected foam generating material (27) onto the exposed live conductor. The impact force further pushes the cable away and forms an insulating foam layer on the cable surface. At the same time, the first sealing plate (26) drives the second sealing plate (28) and the third sealing plate (30) to move through the linkage pull rope (32), destroying the sealing of the overflow foam generating material (31). After the foam material comes into contact with the air, it continuously overflows from the foam outlet (13) and foams, forming a foam isolation wall between the working platform and the construction area.

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