Five-point safety belt dual-hook latch monitoring control system

Abstract

This invention discloses a five-point safety belt double hook interlocking monitoring and control system. It detects and identifies whether the fence hook is unattached through a conductive circuit, identifies the attachment posture through an IMU, and uses electromagnetic cross-interlocking logic to force that at least one safety line is maintained at all times, completely solving the problems of false attachment and loss of protection, and achieving the technical effect of 0% false attachment identification rate and 0 protection gap period.

Description

Technical Field

[0001] This invention belongs to the technical field of safety protection equipment for high-altitude operations, specifically involving a five-point safety belt double hook locking monitoring and control system. Background Technology

[0002] Five-point double-hook safety belts are suitable for operations such as climbing and maintenance of high-voltage transmission line towers. Traditional mechanical safety belts rely solely on mechanical hooks (such as double hooks or guardrails) for protection, depending entirely on the operator's operational compliance and self-discipline, thus constituting "passive protection." Therefore, the industry has designed the first generation of electronic monitoring safety belts: installing mechanical microswitches or Hall sensors at the hook locking tongue. When the hook is closed, the sensor sends a signal to the controller, and the system records the hook status or issues an alarm, serving as a "protective reminder." However, the first generation of electronic monitoring safety belts still has the following drawbacks: existing sensors can only detect whether the hook opening is closed, and cannot identify whether the hook is securely attached to a tower or merely loosely fastened to the operator's D-ring. Many workers, for convenience, will fasten the hook to themselves, causing the sensor to falsely identify it as "safely engaged." This deceptive behavior cannot be detected; actual testing shows that the false positive rate of existing technology (Hall sensor) is ≥30%, and existing systems mostly provide "audible and visual alarms." When workers are fatigued or violate regulations (such as simultaneously releasing both hooks to move), the system can only issue an alarm but cannot physically prevent the hooks from opening, resulting in a continued protection gap (the protection gap will persist when both hooks are released simultaneously). It cannot detect whether the "high-hanging, low-using" principle is being implemented. Existing hooks cannot sense their spatial position relative to the human body, and are powerless to prevent "low-hanging, high-using" violations that would result in excessive impact force (≥5000N without current technology intervention) in the event of a fall. Summary of the Invention

[0003] Based on the technical problems of the five-point double-hook safety belt in the background technology, the present invention proposes a five-point safety belt double-hook interlocking monitoring and control system. The system detects and identifies whether the fence hook is unattached through a conductive circuit, identifies the attachment posture through an IMU, and uses electromagnetic cross-interlock logic to force that at least one safety line is maintained at any time, completely solving the problems of false attachment and loss of protection, and achieving the technical effect of 0% false attachment identification rate and 0 protection gap period.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A five-point harness double-hook locking monitoring and control system, the system includes the harness, and also includes:

[0006] The central control module is used to receive and process status signals, output control commands according to preset logic, and simultaneously achieve synchronous communication with the cloud or command center.

[0007] The main protection component includes a fence strip, a first hook, and a conductive loop monitoring unit installed on the fence strip. The conductive loop monitoring unit is used to detect whether the fence strip correctly surrounds the external conductive structure and generate a first status signal.

[0008] The secondary protection component includes a hook rope, a second hook, and an inertial measurement unit mounted on the hook rope. The inertial measurement unit is used to detect the attachment posture of the second hook and generate a second state signal.

[0009] The execution unit includes a first electromagnetic lock and a second electromagnetic lock respectively installed on the first hook and the second hook;

[0010] The central control module is configured with cross-interlock control logic, which is as follows: when the main protection component is determined to be in a dangerous state according to the first state signal, the second electromagnetic lock is controlled to lock the second hook; when the secondary protection component is determined to be in a dangerous state according to the second state signal, the first electromagnetic lock is controlled to lock the first hook.

[0011] Furthermore, the conductive circuit monitoring unit includes a detection circuit disposed inside the fence strip, the detection circuit having an exposed conductive part; when the fence strip correctly surrounds the external conductive structure, the external conductive structure short-circuits the exposed conductive part, causing the detection circuit to be in a first electrical state, corresponding to the main protection component being in a safe state; when the fence strip does not correctly surround the external conductive structure, the detection circuit is in a second electrical state, corresponding to the main protection component being in a dangerous state; the first electrical state and the second electrical state correspond to different impedance threshold ranges.

[0012] The impedance threshold corresponding to the first electrical state is a low-resistance state of ≤1kΩ, and the impedance threshold corresponding to the second electrical state is a high-resistance state of ≥100kΩ. The specific threshold can be adjusted according to actual needs.

[0013] Furthermore, the inertial measurement unit employs an IMU sensor to calculate the angle between the IMU sensing axis and the direction of gravity in real time; when the angle is obtuse, the corresponding secondary protection component is in a safe state; when the angle is acute, the corresponding secondary protection component is in a dangerous state.

[0014] Furthermore, both the first electromagnetic lock and the second electromagnetic lock are power-off locking structures, which remain locked in the power-off state.

[0015] Furthermore, the power-off locking structure includes a spring for providing locking force, with a spring constant k=5N / mm and a limit rod stroke of 3mm, to ensure locking within 0.1 seconds after power failure. The specific spring can be adjusted according to actual needs.

[0016] Furthermore, the central control module is further configured to: when both the main protection component and the secondary protection component are judged to be in a dangerous state, or when any one of the protection components remains in a dangerous state for more than a preset time threshold, control the audible and visual alarm in the execution unit to issue an alarm; when the state is restored to safety, control the first electromagnetic lock and the second electromagnetic lock to automatically unlock.

[0017] The above technical solution can achieve the following beneficial effects:

[0018] This invention utilizes the conductivity of the climbed object (tower) itself as the core detection condition, combined with a special structural design that includes a closed loop with a defined impedance threshold and exposed wear-resistant conductive parts. This fundamentally prevents workers from falsely attaching hooks to insulators or their own cables. It achieves a 0% false connection misjudgment rate, completely resolving the fatal flaw of existing mechanical switches with a false positive rate ≥30%, further avoiding safety risks.

[0019] By employing cross-interlocking logic, safety protection is upgraded from the existing "passive reminder" to "active enforcement." This ensures that at least one hook is reliably connected to the tower body at all times during the worker's movement, with a protection window of zero.

[0020] The electromagnetic lock employs a normally closed locking structure upon power failure, completing the locking action within 0.1 seconds after a power outage. Even in extreme failure scenarios such as battery damage or wire breakage, the system ensures that the hook will not accidentally open, providing a safety net for workers and preventing the risk of falls.

[0021] By introducing IMU technology and combining it with Kalman filtering algorithm (attitude calculation error ≤ ±2°), it can not only detect the presence of hooks, but also accurately determine the hook posture. It can 100% identify and forcibly correct the illegal posture of "low hook, high use", ensuring that the fall impact force is ≤2500N, fully complying with the national standard GB 6095-2021 requirements, and effectively solving the problem of serious injury from falls caused by blind spots in the attitude monitoring of existing technologies. Attached Figure Description

[0022] Figure 1 This is a block diagram of the system's electrical control principle.

[0023] Figure 2 This is a schematic diagram of the overall system structure.

[0024] Figure 3 This is a schematic diagram of the detection circuit in the main protection component.

[0025] Figure 4 This is a schematic diagram of the attitude determination of the IMU sensor in the secondary protection component.

[0026] Figure 5 This is a schematic diagram of the main protection component.

[0027] Figure 6 It is a flowchart of controller logic judgment and control process.

[0028] In the picture:

[0029] In the diagram: 1. Main protection component; 2. Secondary protection component; 3. Conductive circuit monitoring unit; 4. Inertial measurement unit; 5. Central control module; 11. First electromagnetic lock; 12. First hook; 21. Connecting end hook; 22. Hook rope; 24. Second hook; 25. Second electromagnetic lock; 31. Power supply; 32. Protective resistor; 33. Monitoring resistor; 34. Alarm light; 35. Current sensor; 36. Switch. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6 The present invention will be further illustrated by the following examples:

[0031] like Figure 2 As shown, the five-point safety belt dual-hook locking monitoring and control system includes a five-point safety belt, which comprises a central control module 5, a main protection component 1, a secondary protection component 2, and an execution unit, wherein:

[0032] The central control module, located at the waist, includes a central controller, power supply and alarm unit. It is used to receive and process status signals and output control commands according to preset logic. It also integrates a wireless communication module and a positioning module, which can transmit information back to the cloud or command center.

[0033] Main protection components, Figure 5 As shown, it includes a fence strip, a first hook 12, and a conductive loop monitoring unit 3 installed on the fence strip. The conductive loop monitoring unit is used to detect whether the fence strip is correctly wrapped around the external conductive structure and generate a first status signal.

[0034] Secondary protection components, Figure 4 As shown, it includes a hook rope, a second hook 24, and an inertial measurement unit 4 mounted on the hook rope. The inertial measurement unit is used to detect the attachment posture of the second hook and generate a second state signal.

[0035] The execution unit includes a first electromagnetic lock 11 and a second electromagnetic lock 25 respectively installed on the first hook and the second hook;

[0036] The central control module is configured with cross-interlock control logic, which is as follows: when the main protection component is determined to be in a dangerous state according to the first state signal, the second electromagnetic lock is controlled to lock the second hook; when the secondary protection component is determined to be in a dangerous state according to the second state signal, the first electromagnetic lock is controlled to lock the first hook.

[0037] The main protection component has the following structure:

[0038] The independently designed conductive circuit monitoring unit consists of encapsulated sections at both ends and an exposed section in the middle. The encapsulated sections contain a monitoring resistor 33, a protection resistor 32, a power supply 31, an alarm light 34, a current sensor 35, and a switch 36. The exposed section houses a portion of the closed circuit, specifically designed as a detachable, wear-resistant conductive circuit. The exposed conductive parts of the detection circuit are made of wear-resistant conductive material and designed with a pluggable and detachable structure for easy replacement.

[0039] The current sensor monitors the current in the closed loop in real time and transmits the signal back to the central controller.

[0040] Structural Design: The fence strip connected to the first hook is typically made of nylon, vinylon, or silk, all of which are insulating materials. In this invention, the closed loop of the conductive circuit detection unit is installed along its length inside the fence strip, with the encapsulated portion near the hooks at both ends of the fence strip and the exposed portion in the middle.

[0041] Setting threshold: The controller sends a weak detection signal to the closed loop (weak DC signal, voltage 5V, current ≤1mA, to avoid the risk of electric shock).

[0042] Figure 3 The upper middle image shows a dangerous situation where the fence is not around the tower. The monitoring resistor and alarm light on the right are connected to the circuit, and the current sensor reading is low at this time. Figure 3 The lower middle diagram shows the safe state, with the fence properly surrounding the tower and the right-side encapsulation section short-circuited. At this point, the current sensor reading increases, and the long arrow in the diagram indicates the direction of current in the circuit.

[0043] The structure of the secondary protection component is as follows:

[0044] Installed on the back hook rope 22 of the safety belt, it is used to detect whether the back hook is in a safe, high-hanging, low-use posture, corresponding to a safe secondary protection state. It includes an inertial measurement unit 4 (IMU sensor, with a waterproof and dustproof enclosure), fixed to the hook rope, and also with a waterproof and dustproof enclosure. Both ends of the back hook rope are connected to hooks. The hook at the connecting end, which should always be fastened to the back of the safety belt during work, is the second hook. When the second hook is in a dangerous, low-hanging or dangling posture (i.e., the second hook is lower than the connecting end hook), the corresponding secondary protection is in a dangerous state, and the angle between the IMU sensing axis and the direction of gravity is acute (0°~90°). When in the correct high-hanging, low-use posture (i.e., the second hook is higher than the connecting end hook), the corresponding secondary protection is in a safe state, and the angle becomes obtuse. The attitude signal is output in real time (calculated using a Kalman filter algorithm, sampling frequency 100Hz, error ≤±2°). Specifically... Figure 4 As shown, the left side represents the initial / dangerous state of low-mounted, high-use, with the angle α between the IMU sensor's Z-axis and the direction of gravity less than 90 degrees; the right side represents the safe state of high-mounted, low-use, with the angle α between the IMU sensor's Z-axis and the direction of gravity greater than 90 degrees. The connecting hook 21 in the diagram should be fixedly connected to the back of the worker's safety belt. G in the diagram indicates the direction of gravity.

[0045] The central control module has the following structure: its central controller is connected to the sensing units of the main and auxiliary protection components to receive and process electrical status signals and attitude signals. It has pre-stored the judgment logic for safe and dangerous states and can make decisions based on the real-time combination of the two signals. Simultaneously, the local controller integrates a wireless communication module and a positioning module. The connection logic between the components is as follows: Figure 1 As shown.

[0046] The execution unit includes an audible and visual alarm and at least two electromagnetic locks. The two electromagnetic locks are respectively installed at the locking mechanisms of the first hook on the fence and the second hook on the rear hook rope, preferably with an external locking structure. The electromagnetic locks are power-off locking mechanisms (rated locking force ≥ 500N, spring elasticity coefficient k = 5N / mm, limit rod travel 3mm, locking within 0.1 seconds after power failure). Both the audible and visual alarm and the electromagnetic locks are controlled by the local controller; the battery pack and power monitoring module, when the power level is below a threshold, the local controller controls the indicator light to emit a low power warning signal (such as a flashing yellow light).

[0047] The control logic within the central controller is configured as follows (e.g.) Figure 6 ):

[0048] a) When only one protection is judged to be in a dangerous state, the control indicator light will display a warning signal (such as a green light).

[0049] b) When both protections are judged to be in a dangerous state, or when either protection remains in a dangerous state for more than a preset time threshold (15 seconds, the reasonable operation window for personnel to move), the audible and visual alarm will be activated (such as a red light and a buzzer).

[0050] c) When the secondary protection is determined to be in a dangerous state, the electromagnetic lock on the first hook of the control fence is forcibly locked.

[0051] d) When the main protection is determined to be in a dangerous state, the electromagnetic lock controlling the second hook of the rear hook rope is forcibly locked.

[0052] e) When both protection systems are restored to a safe state, control all electromagnetic locks to unlock automatically.

[0053] Specific application examples

[0054] Example 1: Operational scenario of power transmission towers in the power industry

[0055] When operators wear this system to work on the tower, they wrap the main protection hook around the tower's angle steel (conductive structure) and close it. The conductive circuit detection shows an impedance of 0.5kΩ (≤1kΩ, low impedance state), and the system determines that the main protection is effective. The secondary protection hook is hung on the tower crossarm, and the IMU sensor detects an α angle of 120° (above the horizontal line, obtuse angle), determining that the posture is compliant. At this time, both protections are effective, and the system allows either one to be unlocked and moved, allowing the operator to safely switch the hook positions.

[0056] Example 2: Preventing False Judgments in Fake Hook Scenarios

[0057] If a worker mistakenly attaches the main protective hook to their own nylon webbing, the conductive circuit detection shows an impedance of 1MΩ (≥100kΩ, high impedance state). The system determines that the main protection is invalid. After a 15-second movement window, the secondary protective hook is immediately locked. The local controller sends back the danger information of "main protection failure" and simultaneously issues a red light and a buzzer to prevent workers from moving without protection and completely eliminate the safety risks caused by false attachment.

[0058] Example 3: Correction of the violation of low-mounted, high-use installation.

[0059] When the operator hangs the secondary protection hook low under the tower, and the IMU sensor detects an α angle of 30° (within the range of 0°~90°) for more than 15 seconds, the system determines it to be a violation of the "low-hanging, high-use" posture and immediately locks the main protection hook. The local controller sends back the danger information of "secondary protection failure" and at the same time, a red light and a buzzer sound to prompt the operator to adjust the position of the secondary protection hook to a compliant posture before the main protection hook is allowed to be unlocked.

[0060] Example 4: Extreme Failure (Battery Depletion) Scenario

[0061] If the battery suddenly runs out during operation, the electromagnetic lock will immediately lock both the main and auxiliary protection hooks due to its "power-off locking" design. This allows the operator to continue the current operation or evacuate safely, avoiding the risk of falling and achieving fault-oriented safety.

[0062] The impedance in the above embodiments can be selected according to the actual situation and changed according to the specific scenario, and is not limited to a specific parameter or model.

[0063] The above descriptions are all preferred embodiments of the present invention. For those skilled in the art, any modifications to the present invention in various equivalent forms without departing from the principle of the present invention shall fall within the protection scope of the appended claims.

Claims

1. A five-point safety belt dual-hook closure monitoring control system, the system comprising a safety belt, characterized in that: Also includes: The central control module is used to receive and process status signals, output control commands according to preset logic, and simultaneously achieve synchronous communication with the cloud or command center. The main protection component includes a fence strip, a first hook, and a conductive loop monitoring unit installed on the fence strip. The conductive loop monitoring unit is used to detect whether the fence strip correctly surrounds the external conductive structure and generate a first status signal. The secondary protection component includes a hook rope, a second hook, and an inertial measurement unit mounted on the hook rope. The inertial measurement unit is used to detect the attachment posture of the second hook and generate a second state signal. The execution unit includes a first electromagnetic lock and a second electromagnetic lock respectively installed on the first hook and the second hook; The central control module is configured with cross-interlock control logic, which is as follows: when the main protection component is determined to be in a dangerous state based on the first state signal, the second electromagnetic lock is controlled to lock the second hook. When the secondary protection component is determined to be in a dangerous state based on the second state signal, the first electromagnetic lock is controlled to lock the first hook. At the same time, when the worker is determined to be in a dangerous working state, the danger information and the worker's location are transmitted back to the cloud or command center in real time through the wireless communication module and positioning module integrated in the local controller.

2. The five-point safety belt dual anchor lock monitoring control system of claim 1, wherein: The conductive circuit monitoring unit includes a detection circuit located inside the fence strip. The detection circuit has an exposed conductive part. When the fence strip is properly wrapped around the external conductive structure, the external conductive structure will connect to the exposed conductive part, causing the encapsulation part containing the monitoring resistor and alarm light to short-circuit, putting the detection circuit in the first electrical state, and the corresponding main protection component in a safe state. When the fence strip does not properly surround the external conductive structure, the detection circuit is in a second electrical state, corresponding to the main protection component being in a dangerous state; the first electrical state and the second electrical state correspond to different impedance threshold ranges.

3. The five-point safety belt dual anchor lock monitoring control system of claim 1, wherein: The inertial measurement unit uses an IMU sensor to calculate the angle between the IMU sensing axis and the direction of gravity in real time. When the angle is obtuse, the corresponding secondary protection component is in a safe state; when the angle is acute, the corresponding secondary protection component is in a dangerous state.

4. The five-point safety belt dual anchor lock monitoring control system of claim 1, wherein: Both the first electromagnetic lock and the second electromagnetic lock are power-off locking structures, which remain locked in the power-off state.

5. The five-point safety belt dual anchor lock monitoring control system of claim 4, wherein: The power-off locking structure includes a spring for providing locking force, which locks within 0.1 seconds after power failure.

6. The five-point safety belt dual anchor lock monitoring control system of claim 1, wherein: The central control module is further configured to: when both the main protection component and the secondary protection component are judged to be in a dangerous state, or when any one of the protection components remains in a dangerous state for more than a preset time threshold, control the audible and visual alarm in the execution unit to issue an alarm and simultaneously transmit the danger information back; when the state is restored to safety, control the first electromagnetic lock and the second electromagnetic lock to automatically unlock.

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