Filling connector anti-dropout protection device capable of detecting connection status and application method

Abstract

The present invention provides a charging connector anti-dropout protection device capable of detecting the connection status and an application method thereof. The device comprises: a connection structure, a handle, a handle base, a detection module, a control module, and a battery management unit; the connection structure is formed by two sets of sleeves and a cylindrical structure connected relative to each other using a bolt structure, the sleeve being used to wrap and tighten the charging connector, and the cylindrical structure being used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle charging connector; each set of sleeves and the cylindrical structure is provided with a handle to achieve a tightened connection between the hydrogen storage output pipe joint and the charging connector, and to lock and reinforce the connection structure; the strain detection structure of the detection module detects the rotational tightening torque during the tightening process; the control module generates a prompt message using a control program based on the detected signal. The device has a sleeve function, thereby replacing a wrench, and does not require disassembly of the original pipeline during installation. It is convenient and quick, and can automatically detect that the connection is in place, preventing the joint from separating from the tube bundle vehicle charging connector.

Description

Technical Field

[0001] The present invention relates to the technical field of gas filling safety optimization, and in particular to a filling connector anti-dropout protection device capable of detecting a connection state and an application method thereof. Background Art

[0002] As one of the most promising clean energy sources, hydrogen energy occupies an important position in the energy structure. With the continuous consolidation of the foundation for hydrogen energy industrialization and the advancement of the industrialization process, the development of the automotive hydrogen energy industry has gradually entered a critical period. Because hydrogen molecules have a degrading effect on materials, high storage and transportation pressures, easy leakage and diffusion, and are flammable and explosive, safety is an important prerequisite for the development of the automotive hydrogen energy industry. According to hydrogen energy accident data, hydrogen supply stations and hydrogen refueling stations, the two major links involving hydrogen filling, account for a relatively high proportion of the total number of accidents. At the same time, due to the scarcity of land resources and the high cost of building a single station, existing gas stations are currently being converted into comprehensive vehicle energy filling stations. Hydrogen filling stations are also gradually moving into relatively densely populated areas. Based on this, it is necessary to pay more attention to the safety of the automotive hydrogen filling process.

[0003] Currently, hydrogen is primarily transported by long tube trailers (tube bundle trucks) between hydrogen production plants (filling) and hydrogen refueling stations (unloading). Upon arrival, the tube bundle trucks must be connected to the filling equipment (unloading equipment) at the station. The current process uses quick-connect couplings, which are tightened by on-site workers using wrenches. To prevent the flexible joints from falling off during the filling and unloading process and swinging due to high-pressure gas spray, potentially causing personal injury, on-site operators must attach a safety rope to a nearby pipeline after connecting the flexible joints to prevent the hydrogen hose from falling off. Currently, after tightening the flexible joints on hydrogen tube bundle trucks, operators primarily use soapy water to check for leaks. This cumbersome and unreliable operation poses numerous safety risks, such as the following:

[0004] (1) When using soap solution for inspection, high-pressure gas is required. If the joint falls off, it will cause harm to the operator;

[0005] (2) Since the filling (discharging) time of hydrogen is generally several hours, or even more than 10 hours, there may be no gas leakage when the union is just connected. However, as time goes by, hydrogen leakage may occur during the filling (discharging) process;

[0006] (3) Only when the fixed object to which the safety rope is tied is firm and the safety rope joint is not loose, can the safety rope effectively prevent the movable joint from swinging around after it falls off. However, due to the different operating habits, sense of responsibility, safety awareness, etc. of different operators, it is common for the safety rope to not be tied or to be loosely tied on site.

[0007] (4) The tools used to tighten joints on site are not standardized. Some are open-end wrenches, some are adjustable wrenches, and some are pipe clamps. As a result, different operators may tighten the joints to different degrees of tightness, and the joints may become thread-slipped.

[0008] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0009] To address the above-mentioned problems, the present invention provides a filling connector anti-dropout protection device capable of detecting the connection status. This device is a protection device capable of detecting in real time whether the filling connector of a hydrogen tube bundle vehicle is properly connected and having a joint anti-dropout performance. It can effectively prevent the hydrogen hose from falling off when the hydrogen tube bundle vehicle is being filled, effectively ensuring the safety of loading and unloading the hydrogen tube bundle vehicle and improving the overall safety and reliability of hydrogen loading and unloading operations. In a preferred embodiment, the device includes: a connection structure, a handle, a handle base, a detection module, a control module, and a battery management unit.

[0010] The connection structure is formed by two sleeves and a cylindrical structure connected relative to each other using a bolt structure. The sleeve and the cylindrical structure are fixedly connected by a connecting block, and the connecting block is provided with a bolt through hole.

[0011] The sleeve is provided at the connection end of the filling joint with the tube bundle vehicle and is used to wrap and tighten the filling joint;

[0012] One end of the cylindrical structure is fixedly connected to the sleeve through a connecting block, and the other end is used to connect the hydrogen storage output pipe joint, which is used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle filling joint.

[0013] Each set of sleeves and cylindrical structures is provided with a handle, which is used to replace a wrench to connect the flexible joint of the hydrogen storage output pipe with the filling joint of the tube bundle vehicle, and to lock and reinforce the connection structure after the connection is completed; the handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle;

[0014] The detection module includes a detection structure and a detection circuit. The detection structure includes a strain detection structure, which is arranged between the rear end connection blocks of the sleeve and is used to detect the rotational tightening torque of the flexible joint during the tightening process.

[0015] The detection circuit includes a signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module;

[0016] The control module is in communication with the detection circuit and the hydrogen delivery valve, and is used to receive a detection signal, control the hydrogen delivery valve according to the detection signal based on a control program, and output prompt information.

[0017] In an optional embodiment, the sleeve adopts a hexagonal structure, and the handle adopts a foldable handle, one end of which is movably connected to the sleeve, so that the sleeve can be directly rotated and tightened by using the handle when the flexible joint of the hydrogen storage output pipe is connected to the filling joint of the tube bundle vehicle.

[0018] Furthermore, in one embodiment, the sleeve is fixedly connected to both sides of the cylindrical structure via connecting blocks, and a plurality of bolt through holes are provided on each connecting block.

[0019] In a preferred embodiment, a strain gauge pasting hole is provided between the upper and lower connecting blocks at the rear end of the sleeve for pasting and setting the strain detection structure, and the strain detection structure adopts a strain resistance sheet.

[0020] Optionally, in one embodiment, the tail end of the handle is provided with a hook-type buckle that can be extended and retracted to a limited distance, which is used to clamp with the handle base provided on the flexible joint end of the hydrogen storage output pipe to prevent the flexible joint from falling off and separating from the filling joint.

[0021] Furthermore, in one embodiment, the detection circuit also includes a combustible gas detection circuit, which realizes real-time detection of combustible gas through an electrochemical sensor, and transmits the combustible gas detection signal to the control module in real time, and the control module realizes data recognition and outputs warning information.

[0022] In a preferred embodiment, the detection circuit further includes a folding mechanism detection circuit, which uses a rotation angle sensor to detect the folding state of the foldable handle by measuring the tap position of the adjustable potentiometer, and then the control module generates and outputs prompt information based on the folding state information.

[0023] Optionally, in one embodiment, the detection module is provided with a status transmitting unit for unidirectionally transmitting the detection signal to the control module. The status transmitting unit adopts a wireless radio frequency encoding chip and is in a sleep mode when there is no detection signal to be sent.

[0024] Furthermore, in a preferred embodiment, the control module includes a signal receiving unit, a single-chip microcomputer and peripheral circuits. The signal receiving unit is used to receive one or more detection signals. The single-chip microcomputer adopts an STM32L071 single-chip microcomputer, which is used to complete the control of each detection circuit and the hydrogen transfer valve, as well as data processing and generation of corresponding output instructions.

[0025] The signal receiving unit adopts a wireless transceiver unit. In normal working state, it enters sleep mode in response to the command of the USART interface of the single-chip microcomputer. In idle state, it wakes up regularly according to a set period to listen for command reception requirements.

[0026] In an optional embodiment, the battery management unit is used to convert the power supply voltage and monitor the battery voltage in real time, transmit the monitoring results to the control module, and the control module outputs prompt information based on the monitoring results, wherein a DCDC conversion circuit is used to boost and buck the power supply.

[0027] On the other hand, based on the application aspects of the device described in any one or more of the above embodiments, the present invention also provides an application method of a filling connector anti-dropout protection device capable of detecting a connection state. Preferably, in one embodiment, the method includes:

[0028] Device preparation steps: After verifying the stability of the bolts connecting the protection device, securely connect the protection device to the flexible joint of the hydrogen storage output pipe, leaving the handle in an unfolded state;

[0029] Filling joint tightening step: insert the filling joint of the tube bundle vehicle that meets the filling requirements into the sleeve of the protective device, wrap the filling joint and tighten it with the handle;

[0030] Connection status identification step: During the tightening process, the detection module continuously uses the strain detection structure to detect the rotational tightening torque information of the flexible joint, and transmits it to the control module through the detection circuit. Based on the preset torque threshold value, it is determined that when the real-time rotational tightening torque meets the set requirement, it indicates that the tightening state of the flexible joint meets the requirement, and a reminder instruction is output to stop tightening;

[0031] Handle tightening steps: clamp the hook buckle at the end of the handle to the handle base at the flexible joint end of the hydrogen storage output pipe, and then apply force towards the sleeve to fully fold the handle to prevent the filling joint from falling off;

[0032] Filling execution steps: Open the relevant hydrogen delivery valves of the hydrogen storage system to realize hydrogen filling.

[0033] Furthermore, in an optional embodiment, during the filling execution step, the detection circuit of the detection module monitors the combustible gas leakage and folding mechanism status data during the filling process in real time, and the control module generates and outputs early warning information based on the real-time detection data.

[0034] Compared with the closest prior art, the present invention also has the following beneficial effects:

[0035] The present invention provides a filling joint anti-falling protection device and application method that can detect the connection status. The connection structure of the device is formed by two sets of sleeves and a cylindrical structure that are relatively connected by a bolt structure. The sleeve is used to wrap and tighten the filling joint. When used, the cylindrical structure wraps and tightens the hydrogen storage output pipe flexible joint and the tube bundle vehicle charging joint; each set of sleeves and cylindrical structure is provided with a handle for realizing the connection between the hydrogen storage output pipe flexible joint and the tube bundle vehicle charging joint, and locking and reinforcing the connection structure; the strain detection structure of the detection module detects the rotational tightening torque of the flexible joint during the tightening process; the control module generates prompt information by using the control program according to the detected signal; the application of the device has the function of a sleeve to replace the wrench, and there is no need to disassemble the original pipeline during installation, which is convenient and quick, can automatically detect that the connection is in place, output prompt information to the user, and prevent the flexible joint from separating from the filling joint of the tube bundle vehicle; the device has wireless data transmission and control functions, and can upload real-time connection status abnormalities, falling-off and other fault conditions to the control module, and make a quick response, thereby ensuring the overall reliability of the system and meeting the requirements of Internet of Things and intelligence.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 1 is a schematic structural diagram of a filling connector anti-dropout protection device capable of detecting connection status provided by one embodiment of the present invention;

[0039] Figure 2 2. It is a structural diagram of the state in which the handle hook buckle and the handle base are clamped together in the filling connector anti-drop protection device capable of detecting the connection state provided by an embodiment of the present invention;

[0040] Figure 3 2. It is a schematic structural diagram of a handle of a filling connector anti-dropout protection device capable of detecting connection status provided by an embodiment of the present invention in a folded state;

[0041] Figure 4 This is a schematic diagram of the circuit structure of a status emission unit in a detection module of a filling connector anti-dropout protection device capable of detecting the connection status provided by one embodiment of the present invention;

[0042] Figure 5This is a schematic diagram of the principle structure of a signal amplifying circuit of a filling connector anti-dropout protection device capable of detecting the connection status provided by an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the circuit structure of a control module command receiving unit of a filling connector anti-dropout protection device capable of detecting connection status provided by one embodiment of the present invention;

[0044] Figure 7 Schematic diagram of the operating principle of a control module of a filling connector anti-dropout protection device capable of detecting connection status provided by an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the control program principle flow of a control module of a filling connector anti-dropout protection device capable of detecting connection status provided by an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the circuit principle of a battery management unit of a charging connector anti-dropout protection device capable of detecting connection status provided by an embodiment of the present invention;

[0047] Figure 10 Schematic diagram of the operating principle of the detection circuit of the filling connector anti-dropout protection device capable of detecting the connection status provided by an embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of the operating principle of a combustible gas detection circuit of a filling connector anti-dropout protection device capable of detecting the connection status provided by another embodiment of the present invention;

[0049] Figure 12 It is a schematic diagram of the operating principle of the folding mechanism detection circuit of the filling connector anti-dropout protection device capable of detecting the connection status provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will describe in detail the implementation methods of the present invention in conjunction with the accompanying drawings and embodiments, so that practitioners of the present invention can fully understand how the present invention applies technical means to solve technical problems and achieve the implementation process of technical effects, and can implement the present invention in accordance with the above implementation process. It should be noted that as long as no conflict exists, the various embodiments and various features of each embodiment in the present invention can be combined with each other, and the resulting technical solutions are all within the scope of protection of the present invention.

[0051] Although the flowcharts depict the operations as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. The order of the operations can be rearranged. A process can be terminated when its operations are completed, but can also have additional steps not included in the figures. A process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0052] Computer devices include user devices and network devices. User devices or clients include, but are not limited to, computers, smartphones, PDAs, and the like; network devices include, but are not limited to, a single network server, a server group consisting of multiple network servers, or a cloud computing-based cloud consisting of a large number of computers or network servers. Computer devices can operate independently to implement the present invention, or they can connect to a network and interact with other computer devices in the network to implement the present invention. Networks in which computer devices reside include, but are not limited to, the Internet, wide area networks, metropolitan area networks, local area networks, VPN networks, and the like.

[0053] The terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms, and these terms are used merely to distinguish one element from another. The term "and / or" as used herein includes any and all combinations of one or more of the listed associated items. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present.

[0054] The terms used herein are intended only to describe specific embodiments and are not intended to limit exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "a", "an", "an item" used herein are also intended to include the plural. It should also be understood that the terms "comprise" and / or "include" used herein specify the presence of stated features, integers, steps, operations, units and / or components, and do not preclude the presence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0055] During the critical initial phase of clean energy development, hydrogen, as one of the most promising clean energy sources, holds a crucial position in the energy mix. With the continuous consolidation of the hydrogen energy industrialization foundation and the advancement of industrialization, the automotive hydrogen energy industry is entering a critical period. Automotive hydrogen energy primarily refers to the hydrogen energy used to power fuel cell vehicles, encompassing a broad upstream and downstream industry chain, encompassing hydrogen production, storage, transportation, refueling, and its application in fuel cell vehicles, as well as related supporting links. The automotive hydrogen energy industry is transitioning from technology research and development to demonstration applications and then to industrialization, with steady progress in technological innovation and industrial development and a continuously improving supporting system.

[0056] Hydrogen molecules degrade materials, pose high storage and transportation pressures, are prone to leakage and diffusion, and are flammable and explosive. Safety is a crucial prerequisite for the development of the automotive hydrogen energy industry. Since 2000, a review of the four major links in the automotive hydrogen energy industry chain—production and purification, hydrogen supply stations, road transportation, and hydrogen refueling stations—based on international databases (such as the US H2Tools database, Japan's High Pressure Gas Safety Act database, the EU HIAD database, and my country's information network) reveals a staggering 90 hydrogen accidents worldwide. Of these, 54, or 60%, involved hydrogen filling at hydrogen supply stations and refueling stations. Furthermore, due to limited land resources and the high cost of building independent stations, existing gas stations are often converted into integrated vehicle energy refueling stations. Hydrogen refueling stations are also increasingly being installed in densely populated areas, necessitating greater attention to the safety of the hydrogen refueling process.

[0057] Currently, hydrogen is primarily transported by long tube trailers (tube bundle trucks) between hydrogen production plants (filling) and hydrogen refueling stations (unloading). Upon arrival, the tube bundle trucks need to be connected to the filling equipment (unloading equipment) at the station. The current process uses quick-connects, which are tightened by on-site workers using wrenches. To prevent the flexible joints from falling off during the filling and unloading process and swinging due to high-pressure gas spray, potentially causing personal injury, on-site operators must hang a safety rope on a nearby pipeline after connecting the flexible joints to prevent the hydrogen hose from falling off.

[0058] The current filling pressure of hydrogen tube bundle trucks is 20 MPa, which will be increased to 45 MPa in the future. Currently, after tightening the unions, operators use soapy water to check for leaks. This is a cumbersome and unreliable operation, posing numerous safety risks, such as the following:

[0059] (1) When using soap solution for inspection, high-pressure gas is required. If the joint falls off, it will cause harm to the operator;

[0060] (2) Since the filling (discharging) time of hydrogen is generally several hours, or even more than 10 hours, there may be no gas leakage when the union is just connected. However, as time goes by, hydrogen leakage may occur during the filling (discharging) process;

[0061] (3) Only when the fixed object to which the safety rope is tied is firm and the safety rope joint is not loose, can the safety rope effectively prevent the movable joint from swinging around after it falls off. However, due to the different operating habits, sense of responsibility, safety awareness, etc. of different operators, it is common for the safety rope to not be tied or to be loosely tied on site.

[0062] (4) The tools used to tighten joints on site are not standardized. Some are open-end wrenches, some are adjustable wrenches, and some are pipe clamps. As a result, different operators may tighten the joints to different degrees of tightness, and the joints may become thread-slipped.

[0063] To address these issues, the present invention provides a device for preventing the receptacle from falling out. This device can detect the connection status of the receptacle on a hydrogen tube bundle vehicle in real time, monitor hydrogen leaks during the filling (or unloading) process, and prevent the receptacle from falling out if the hydrogen hose ruptures during recharging. This device prevents the receptacle from falling out due to a rupture during high-pressure hydrogen filling. This device effectively ensures the safety of hydrogen tube bundle vehicle loading and unloading operations, improving the overall safety and reliability of hydrogen loading and unloading operations.

[0064] The following describes in detail the structural components, connection methods, and functional principles of the system according to the embodiment of the present invention based on the accompanying drawings. Although the logical order of each operation is shown in the process of describing the system structure and operating principle, in some cases, the operations shown or described may be performed in a different order than here.

[0065] Example 1:

[0066] Figure 1 The schematic diagram of the structure of the anti-drop protection device for the filling connector capable of detecting the connection state provided by the first embodiment of the present invention is shown. Figure 1 It can be seen that the system includes: a connection structure, a handle, a handle base, a detection module, a control module and a battery management unit;

[0067] The connection structure is formed by two sleeves and a cylindrical structure connected relative to each other using a bolt structure. The sleeve and the cylindrical structure are fixedly connected by a connecting block, and the connecting block is provided with a bolt through hole.

[0068] The sleeve is provided at the connection end of the filling joint with the tube bundle vehicle and is used to wrap and tighten the filling joint;

[0069] One end of the cylindrical structure is fixedly connected to the sleeve through a connecting block, and the other end is used to connect the hydrogen storage output pipe joint, which is used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle filling joint.

[0070] Each set of sleeves and cylindrical structures is provided with a handle, which is used to replace a wrench to connect the flexible joint of the hydrogen storage output pipe with the filling joint of the tube bundle vehicle, and to lock and reinforce the connection structure after the connection is completed; the handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle;

[0071] The detection module includes a detection structure and a detection circuit. The detection structure includes a strain detection structure, which is arranged between the rear end connection blocks of the sleeve and is used to detect the rotational tightening torque of the flexible joint during the tightening process.

[0072] The detection circuit includes a signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module;

[0073] The control module is in communication with the detection circuit and the hydrogen delivery valve, and is used to receive a detection signal, control the hydrogen delivery valve according to the detection signal based on a control program, and output prompt information.

[0074] The charging joint anti-dropout protection device capable of detecting the connection status provided by the above-mentioned embodiment of the present invention can automatically detect the connection status and prevent the flexible joint from separating from the charging joint of the tube bundle vehicle; it can be installed without disassembling or otherwise modifying the original pipeline, and has a socket function to replace a wrench. The combination of the handle and socket structure effectively and conveniently ensures the overall reliability of the system.

[0075] Specifically, if Figure 1 As shown, the connection structure includes a sleeve 1 and cylindrical structures 4 and 5. In a preferred embodiment, the sleeve adopts a hexagonal structure; the hexagonal sleeve 1 is located at the front end of the protective device, that is, close to one end of the tube bundle vehicle, for wrapping and tightening the flexible joint.

[0076] The hexagonal sleeve is fixedly connected to the cylindrical structure via connecting blocks, which are fixed to both sides of the sleeve and the cylindrical structure via connecting blocks. Each connecting block is equipped with multiple bolt holes. A strain gauge for torque detection is installed between the upper and lower connecting blocks. This provides real-time monitoring of the torque applied to the flexible joint during tightening. When the torque applied to the flexible joint reaches a certain value, the control module generates an audible and visual alarm based on the torque information, prompting the operator to stop tightening the sleeve and providing a reminder that the joint is properly connected.

[0077] Each sleeve and cylindrical structure is provided with a handle, designated 3 and 6, respectively. These handles are foldable and located at the rear end of the protective device, away from the tube bundle vehicle. Specifically, one end of the handle is flexibly connected to the sleeve and can rotate circumferentially along the connecting column. This is used to securely lock the connection between the hydrogen storage output pipe union and the tube bundle vehicle's charging connector after connection is complete, preventing the union from falling off. The foldable handle is flexibly connected to the sleeve, allowing the sleeve to be directly rotated and tightened by the handle when the hydrogen storage output pipe union is connected to the tube bundle vehicle's charging connector.

[0078] The handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle.

[0079] In actual application, after the flexible joint is tightened, the handle is folded back in turn. The tail end of the handle is provided with a hook-type buckle that can be retracted to a limited distance, which is used to clamp with the handle base fixed on the flexible joint end of the hydrogen storage output pipe to prevent the flexible joint from falling off and separating from the filling joint. That is, the retractable hook-type buckle at the tail end of the sleeve handle is clamped with the corresponding handle base, such as Figure 2 As shown, the handle base is fixedly sleeved on the flexible joint end of the hydrogen storage output pipe; further pressing the handle toward the sleeve makes it fully folded, close to the sleeve and the filling joint, to prevent it from falling off. The protective device when the handle is in the fully folded state is as shown Figure 3 shown.

[0080] A strain gauge attachment hole 2 is provided between the upper and lower connecting blocks at the rear end of the sleeve for attaching the strain detection structure, which utilizes a strain gauge. Specifically, the strain detection structure utilizes a strain gauge, which is installed in the strain gauge attachment hole between the upper and lower connecting blocks at the rear end of the sleeve and attached to the upper and lower connecting blocks relative to each other, to detect the rotational tightening torque of the flexible joint during tightening.

[0081] The detection module is equipped with a status transmitter for unidirectionally transmitting detection signals to the control module. This status transmitter uses a wireless radio frequency encoding chip and enters a sleep mode when there are no detection signals to send. In actual application, the detection module uses the status transmitter to achieve unidirectional transmission of sleeve rotational tightening torque information to the control module.

[0082] In an optional embodiment, the state transmitting unit uses a low-power wireless radio frequency encoding chip to achieve one-way transmission of information within a transmission distance of 10 meters. Its transmission current can be as low as 3mA, and the sleep current is below the microampere level. The circuit schematic is shown in FIG. Figure 4 shown.

[0083] The detection circuit is connected to the state emission unit, and includes a signal amplification circuit, specifically a weak signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module.

[0084] The weak signal amplification circuit measures the microstrain of the connector block using strain gauges placed in the holes for attaching strain gauges at the rear end of the sleeve, enabling real-time measurement of torque during the tightening of the joint. Two strain gauges are attached to the upper and lower connector blocks, respectively. The signals generated by these strain gauges are extremely weak and susceptible to interference. This weak signal amplification circuit achieves microstrain measurement, suppressing unwanted interference signals such as thermal noise and electromagnetic fields.

[0085] In an optional embodiment, the present invention uses a fully differential amplifier circuit to process weak signals. The fully differential amplifier circuit can effectively suppress useless interference signals such as thermal noise and electromagnetic fields. The principle structure of the circuit module is as follows: Figure 5 shown.

[0086] The control module receives setting command information and detection status information processed by the detection circuit through a set command receiving unit. The setting command information includes factory coefficient calibration information and on-site limit setting information, etc. The detection status information includes rotational tightening torque information. Specifically, a low-cost, low-sleep current wireless data transceiver module can be selected as the command receiving unit.

[0087] The schematic diagram of the command receiving unit is as follows: Figure 6 As shown in the figure, U8 is a 433Mhz wireless transceiver module. Under normal working conditions, the microcontroller sends a command through the USART interface to put it into sleep mode. When the device is idle, the module is woken up regularly to listen to whether there is a command issued by the control module.

[0088] In an optional embodiment, the control module includes a single-chip microcomputer and peripheral circuits, and uses a low-power single-chip microcomputer to realize the control of the relevant circuits of each unit, data acquisition, status transmission, etc. based on a pre-set control program. The peripheral circuit can provide the single-chip microcomputer with a stable power-on reset signal and power supply filtering, etc.

[0089] In actual application, the embodiment of the present invention uses the ultra-low power single-chip microcomputer STM32L071 to complete the control of each unit circuit, data acquisition, and status transmission, etc. Its peripheral circuit mainly provides the single-chip microcomputer with a stable power-on reset signal and power green wave, etc. The schematic diagram of the control module is as follows Figure 7 As shown in the figure, resistor R17 and capacitor C15 form a power-on reset circuit, which provides a 10mS low-level signal to the reset pin of the microcontroller at the moment of power-on, setting the internal registers of the microcontroller to the initial state.

[0090] Among them, the control program makes judgments or calculations based on the state information obtained from the detection according to the needs, generates corresponding control instructions according to the judgment results or calculation results, and executes them. For example, the rotational tightening torque information of the strain detection module reaches the control module after being processed by the weak signal amplification circuit. The control program compares the rotational tightening torque information with the pre-stored torque threshold value. If the difference between the current rotational tightening torque and the pre-stored torque threshold value meets the set requirements, it indicates that the connection and tightening state of the flexible joint and the tube bundle vehicle filling joint meets the requirements, then the control module will sound and light alarms, prompting the operator to stop twisting the sleeve, and give a reminder that the joint is connected in place. The main program flow chart of the control program is as follows: Figure 8 shown.

[0091] The battery in the embodiment of the present invention uses an ER14250 lithium-ion battery, whose output voltage when fully charged is 3.6V and whose output voltage when empty is 2V. However, the operating voltage of multiple unit circuits such as the microcontroller system, folding mechanism detection, and leakage detection is 3.3V, and the voltage fluctuation is required to be no more than 1mV.

[0092] Furthermore, the battery management unit is used to convert the power supply voltage and monitor the battery voltage in real time, and transmit the monitoring results to the control module, which outputs prompt information based on the monitoring results, wherein a DCDC conversion circuit is used to boost and reduce the power supply voltage. In the embodiment of the present invention, the battery management unit uses a DCDC conversion circuit, which can both boost and reduce the voltage, and can effectively utilize the residual power in the battery and reduce the frequency of on-site battery replacement; at the same time, it has a real-time battery voltage monitoring function, and when the voltage is lower than a certain value, the control module can be used to remind you to replace the battery in the form of voice or light indication; the circuit schematic diagram of the battery management unit is as follows Figure 9 shown.

[0093] like Figure 9 As shown in the circuit, U1 is a high-efficiency step-up and step-down power supply chip. Its input voltage can be as low as 1.2V, and it can stably output a 3.3V DC voltage with a conversion efficiency of over 97%, thereby reducing the power consumption of the entire device. U4 is an ultra-low-power integrated operational amplifier with a quiescent current of less than 30nA and a bias current of less than 10fA. Therefore, using megohm-level resistors at the front end to divide the battery output voltage will not affect the voltage division effect, while also reducing the energy loss of the battery caused by the voltage division.

[0094] In an optional embodiment, the control module, connection circuit, battery management unit and power supply are integrated in a high-temperature resistant protective shell. During the filling process, the protective shell can be fixedly set on a structure whose distance from the strain detection module meets the set conditions to avoid the required connection circuit being too long; for example, it can be set at the sleeve of the connection structure or at the base of the handle.

[0095] In an optional embodiment, the protection device is further provided with a connecting bracket that matches the protection shell, and when needed, the connecting bracket can detachably fix the protection shell on a structure that meets the requirements.

[0096] The anti-dropout protection device for the filling joint of the hydrogen tube bundle vehicle according to the embodiment of the present invention can automatically detect whether the connection is in place, prevent the flexible joint from separating from the filling joint of the tube bundle vehicle, standardize on-site operation, and complete installation without dismantling or otherwise modifying the original pipeline. It also has a socket function, thereby replacing a wrench, which is convenient and quick.

[0097] Example 2:

[0098] The first embodiment of the present invention provides a charging connector anti-dropout protection device capable of detecting connection status, comprising: a connection structure, a handle, a handle base, a detection module, a control module, and a battery management unit;

[0099] The connection structure is formed by two sleeves and a cylindrical structure connected relative to each other using a bolt structure. The sleeve and the cylindrical structure are fixedly connected by a connecting block, and the connecting block is provided with a bolt through hole.

[0100] The sleeve is provided at the connection end of the filling joint with the tube bundle vehicle and is used to wrap and tighten the filling joint;

[0101] One end of the cylindrical structure is fixedly connected to the sleeve through a connecting block, and the other end is used to connect the hydrogen storage output pipe joint, which is used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle filling joint.

[0102] Each set of sleeves and cylindrical structures is provided with a handle, which is used to replace a wrench to connect the flexible joint of the hydrogen storage output pipe with the filling joint of the tube bundle vehicle, and to lock and reinforce the connection structure after the connection is completed; the handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle;

[0103] The detection module includes a detection structure and a detection circuit. The detection structure includes a strain detection structure, which is arranged between the rear end connection blocks of the sleeve and is used to detect the rotational tightening torque of the flexible joint during the tightening process.

[0104] The detection circuit includes a signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module;

[0105] The control module is in communication with the detection module and the hydrogen delivery valve, and is used to receive a detection signal, control the hydrogen delivery valve according to the detection signal based on a control program, and output prompt information.

[0106] The anti-dropout protection device for the tube bundle vehicle's filling joint, with a connection status detection function, provided in the aforementioned embodiment of the present invention, can automatically detect the connection status and prevent the union from separating from the tube bundle vehicle's filling joint. Installation can be completed without disassembling or otherwise modifying the existing pipeline, and its socket function replaces a wrench, effectively and conveniently ensuring the overall reliability of the system. Example 2 is a variation of Example 1, and therefore, specific features identical or similar to Example 1 will not be reiterated. The following description will focus solely on the distinguishing steps.

[0107] Furthermore, the tube bundle vehicle filling joint anti-dropout protection device with a connection status detection function provided in this embodiment of the present invention also has a real-time gas leakage monitoring function. During the filling and unloading process, once a leak is detected, the control module immediately cuts off the gas source; it has wireless data transmission and control functions, and can upload leakage, dropout and other fault conditions to the control module in real time and make a quick response, thereby ensuring the overall reliability of the system.

[0108] In this embodiment, the device also has the functions of folding mechanism position detection, combustible gas micro-leakage detection and data upload; Based on this, the detection principle of the detection circuit is as follows Figure 10 As shown, the detection circuit further includes: a combustible gas detection circuit and a folding mechanism state detection circuit.

[0109] In a preferred embodiment, the detection circuit also includes a combustible gas detection circuit, which realizes real-time detection of combustible gas through an electrochemical sensor and transmits the combustible gas detection signal to the control module in real time, and the control module realizes data recognition and outputs warning information.

[0110] The combustible gas detection circuit can adopt combustible gas detection sensors with the following principles, including electrochemical, catalytic combustion, photoionization, thermopile, and micromechanical, taking into account various factors such as performance, cost, and structure.

[0111] In an optional embodiment, the present invention uses an electrochemical (fuel cell) sensor for combustible gas detection, which has the advantages of low power consumption, high precision, high sensitivity, wide linear range, strong anti-interference ability, excellent repeatability and stability, etc. The driving circuit principle is as follows Figure 11 As shown, preferably, the number of the combustible gas sensor is one or more, and they are arranged at the connection of the filling joint of the tube bundle vehicle.

[0112] On the other hand, in an optional embodiment, the detection circuit also includes a folding mechanism detection circuit, which uses a rotation angle sensor to detect the folding state of the foldable handle by measuring the tap position of the adjustable potentiometer, and then the control module generates and outputs prompt information based on the folding state information.

[0113] The folding mechanism detection circuit comprehensively considers various requirements such as cost, system performance, installation form, power consumption, etc., and can choose to use acceleration sensors to detect inclination angles, travel switches to detect, etc. to detect when the handle is folded into place.

[0114] In an optional embodiment, the folding mechanism detection circuit of this embodiment uses a rotation angle sensor, which has an adjustable potentiometer inside. As long as the position of the adjustable potentiometer tap is measured, the folding state of the handle can be determined. The principle of the detection circuit is as follows: Figure 12As shown in the figure, R1 is a rotation angle sensor. Resistors R3 and R2, connected in series above and below it, respectively, are designed to reduce the current flowing through the resistors and lower system power consumption. When the handle is folded, the tap of R1 changes, and the voltage between the tap and GND changes accordingly. The operational amplifier in the figure functions to perform impedance matching and improve measurement accuracy. Preferably, there are two acceleration sensors, each located at a location where displacement changes significantly during the folding process of the handle, such as the middle movable connection node of the handle.

[0115] Accordingly, in this embodiment, the control module receives setting command information and detection status information processed by the detection circuit through a set command receiving unit. The setting command information includes pre-factory coefficient calibration information and on-site limit setting information, etc. The detection status information includes rotational tightening torque information, battery power monitoring information, combustible gas detection information, and folding status detection information of the folding mechanism. Specifically, a low-cost, low-sleep current wireless data transceiver module can be selected as the command receiving unit.

[0116] In a preferred embodiment, the control module includes a signal receiving unit, a single-chip microcomputer and peripheral circuits. The signal receiving unit is used to receive one or more detection signals. The single-chip microcomputer adopts an STM32L071 single-chip microcomputer to complete the control of each detection circuit and the hydrogen transfer valve, as well as perform data processing and generate corresponding output instructions.

[0117] The signal receiving unit adopts a wireless transceiver unit. In normal working state, it enters sleep mode in response to the command of the USART interface of the single-chip microcomputer. In idle state, it wakes up regularly according to a set period to listen for command reception requirements.

[0118] The schematic diagram of the command receiving unit is as follows: Figure 6 As shown in the figure, U8 is a 433Mhz wireless transceiver module. Under normal working conditions, the microcontroller sends a command through the USART interface to put it into sleep mode. When the device is idle, the module is woken up regularly to listen to whether there is a command issued by the control module.

[0119] In an optional embodiment, the control module includes a single-chip microcomputer and peripheral circuits, and uses a low-power single-chip microcomputer to realize the control of various types of detection circuits, data acquisition, status transmission, etc. based on a pre-set control program. The peripheral circuit can provide the single-chip microcomputer with a stable power-on reset signal and power supply filtering, etc.

[0120] In actual application, the embodiment of the present invention uses the ultra-low power single-chip microcomputer STM32L071 to complete the control of each unit circuit, data acquisition, and status transmission, etc. Its peripheral circuit mainly provides the single-chip microcomputer with a stable power-on reset signal and power green wave, etc. The schematic diagram of the control module is as follows Figure 7As shown in the figure, resistor R17 and capacitor C15 form a power-on reset circuit, which provides a 10mS low-level signal to the reset pin of the microcontroller at the moment of power-on, setting the internal registers of the microcontroller to the initial state.

[0121] The control program performs judgment or calculation based on the status information obtained by detection according to the needs, generates corresponding control instructions according to the judgment results or calculation results, and executes them.

[0122] In an optional embodiment, the control module, connection circuit, battery management unit and power supply are integrated in a high-temperature resistant protective shell. During the filling process, the protective shell can be fixedly set on a structure whose distance from the sensor and strain detection module meets the set conditions to avoid the required connection circuit being too long; for example, it can be set at the sleeve of the connection structure or at the base of the handle.

[0123] In an optional embodiment, the protection device is further provided with a connecting bracket that matches the protection shell, and when needed, the connecting bracket can detachably fix the protection shell on a structure that meets the requirements.

[0124] The anti-dropout protection device for the hydrogen tube bundle vehicle's filling connector, using this embodiment, automatically detects when the connection is in place, preventing the flexible connector from separating from the vehicle's filling connector. Installation can be completed without disassembling or modifying the existing pipeline, and the device incorporates a socket function, replacing a wrench. It also features real-time gas leak monitoring throughout the entire filling (or unloading) process. Once a leak is detected, the control module can immediately shut off the gas source and output a prompt message, improving operational safety. Furthermore, it incorporates wireless data transmission and control capabilities, enabling real-time upload of leaks, dropouts, and other fault conditions to the control module for rapid response, ensuring overall system reliability and meeting the requirements of IoT and intelligentization.

[0125] The automotive hydrogen energy industry is currently experiencing rapid growth, necessitating the rapid development of supporting infrastructure such as hydrogen refueling stations and hydrogen supply stations. Hydrogen is primarily supplied between hydrogen refueling stations and hydrogen supply stations via road transport using tube-bundle trucks. Loading and unloading hydrogen within the stations takes a long time, and the reliability of the connection between the tank truck and the loading and unloading pipelines determines the safety of the entire loading and unloading operation. The current method of tightening quick-release joints using wrenches by on-site workers carries the risk of personal injury from high-pressure gas spray and swinging. Therefore, the safer anti-drop protection device for hydrogen tube-bundle truck filling joints provided by the present invention has promising application prospects.

[0126] In the filling connector anti-dropout protection device capable of detecting the connection status provided by an embodiment of the present invention, each module or unit structure can operate independently or in combination according to actual connection setting requirements and signal processing requirements to achieve corresponding technical effects.

[0127] Example 3:

[0128] The above-disclosed embodiments of the present invention describe the device in detail. Based on other aspects of the device described in any one or more of the above-disclosed embodiments, the present invention further provides a method for applying a connection-state-detectable charging connector anti-dropout protection device. This method is applied to the connection-state-detectable charging connector anti-dropout protection device described in any one or more of the above-disclosed embodiments. A specific embodiment is provided below for detailed description.

[0129] Specifically, the application method of the filling connector anti-dropout protection device capable of detecting the connection status provided by the embodiment of the present invention includes:

[0130] Device preparation steps: After verifying the stability of the bolts connecting the protection device, securely connect the protection device to the flexible joint of the hydrogen storage output pipe, leaving the handle in an unfolded state;

[0131] Filling joint tightening step: insert the filling joint of the tube bundle vehicle that meets the filling requirements into the sleeve of the protective device, wrap the filling joint and tighten it with the handle;

[0132] Connection status identification step: During the tightening process, the detection module continuously uses the strain detection module to detect the rotational tightening torque information of the flexible joint, and transmits it to the control module through the detection circuit. Based on the preset torque threshold value, it is determined that when the real-time rotational tightening torque meets the set requirements, it indicates that the tightening state of the flexible joint meets the requirements, and a reminder instruction is output to stop tightening;

[0133] Handle tightening steps: clamp the hook buckle at the end of the handle to the handle base at the flexible joint end of the hydrogen storage output pipe, and then apply force towards the sleeve to fully fold the handle to prevent the filling joint from falling off;

[0134] Filling execution steps: Open the relevant hydrogen delivery valves of the hydrogen storage system to realize hydrogen filling.

[0135] Furthermore, in a preferred embodiment, in the filling execution step, the combustible gas leakage and folding mechanism status data during the filling process are monitored in real time by the detection circuit of the detection module, and the control module generates and outputs early warning information based on the real-time detection data.

[0136] The anti-drop protection device for the filling connector capable of detecting the connection status comprises: a connection structure, a handle, a handle base, a detection module, a control module and a battery management unit;

[0137] The connection structure is formed by two sleeves and a cylindrical structure connected relative to each other using a bolt structure. The sleeve and the cylindrical structure are fixedly connected by a connecting block, and the connecting block is provided with a bolt through hole.

[0138] The sleeve is provided at the connection end of the filling joint with the tube bundle vehicle and is used to wrap and tighten the filling joint;

[0139] One end of the cylindrical structure is fixedly connected to the sleeve through a connecting block, and the other end is used to connect the hydrogen storage output pipe joint, which is used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle filling joint.

[0140] Each set of sleeves and cylindrical structures is provided with a handle, which is used to replace a wrench to connect the flexible joint of the hydrogen storage output pipe with the filling joint of the tube bundle vehicle, and to lock and reinforce the connection structure after the connection is completed; the handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle;

[0141] The detection module includes a detection structure and a detection circuit. The detection structure includes a strain detection structure, which is arranged between the rear end connection blocks of the sleeve and is used to detect the rotational tightening torque of the flexible joint during the tightening process.

[0142] The detection circuit includes a signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module;

[0143] The control module is in communication with the detection module and the hydrogen delivery valve, and is used to receive a detection signal, control the hydrogen delivery valve according to the detection signal based on a control program, and output prompt information.

[0144] Preferably, in one embodiment, the sleeve of the protective device adopts a hexagonal structure, and the handle adopts a foldable handle, one end of which is movably connected to the sleeve, so that the sleeve can be directly rotated and tightened by the handle when the flexible joint of the hydrogen storage output pipe is connected to the filling joint of the tube bundle vehicle.

[0145] Furthermore, in an optional embodiment, the sleeve is fixedly connected to both sides of the cylindrical structure via connecting blocks, and a plurality of bolt through holes are provided on each connecting block.

[0146] Furthermore, in one embodiment, a strain gauge pasting hole is provided between the upper and lower connecting blocks at the rear end of the sleeve for pasting and setting the strain detection structure, and the strain detection structure adopts a strain resistance sheet.

[0147] In a preferred embodiment, the tail end of the handle is provided with a hook-type buckle that can be extended and retracted to a limited distance, which is used to clamp with the handle base fixed on the flexible joint end of the hydrogen storage output pipe to prevent the flexible joint from falling off and separating from the filling joint.

[0148] Optionally, in one embodiment, the detection circuit further includes a combustible gas detection circuit, which realizes real-time detection of combustible gas through an electrochemical sensor, and transmits the combustible gas detection signal to the control module in real time, and the control module realizes data recognition and outputs warning information.

[0149] In a preferred embodiment, the detection circuit further includes a folding mechanism detection circuit, which uses a rotation angle sensor to detect the folding state of the foldable handle by measuring the tap position of the adjustable potentiometer, and then the control module generates and outputs prompt information based on the folding state information.

[0150] Furthermore, in one embodiment, the detection module is provided with a status transmitting unit for unidirectionally transmitting the detection signal to the control module. The status transmitting unit adopts a wireless radio frequency encoding chip and is in a sleep mode when there is no detection signal to be sent.

[0151] Specifically, in an optional embodiment, the control module includes a signal receiving unit, a single-chip microcomputer and a peripheral circuit, the signal receiving unit is used to realize the reception of one or more detection signals, and the single-chip microcomputer adopts an STM32L071 single-chip microcomputer to complete the control and data processing of each detection circuit and generate corresponding output instructions;

[0152] The signal receiving unit adopts a wireless transceiver unit. In normal working state, it enters sleep mode in response to the command of the USART interface of the single-chip microcomputer. In idle state, it wakes up regularly according to a set period to listen for command reception requirements.

[0153] In actual application, in an optional embodiment, the battery management unit is used to convert the power supply voltage and monitor the battery voltage in real time, and transmit the monitoring results to the control module, which outputs prompt information based on the monitoring results, wherein a DCDC conversion circuit is used to boost and buck the power supply.

[0154] For simplicity of description, the aforementioned method embodiments are described as a series of actions. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, as certain steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also be aware that the embodiments described in this specification are preferred embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0155] It should be pointed out that in other embodiments of the present invention, the method can also obtain a new filling joint anti-fall-off protection application method by combining one or several of the above embodiments to achieve safety optimization of the hydrogen filling operation process.

[0156] It should be noted that, based on the method in any one or more of the above-mentioned embodiments of the present invention, the present invention also provides a storage medium, which stores program code that can implement the method as described in any one or more of the above-mentioned embodiments, and when the code is executed by the operating system, it can implement the application method of the filling connector anti-fall-off protection device that can detect the connection status as described above.

[0157] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should extend to equivalent substitutions of these features understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting.

[0158] The phrase "one embodiment" mentioned in the specification means that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrase "one embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0159] Although the embodiments disclosed herein are as described above, the contents described herein are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A filling connector anti-drop protection device capable of detecting connection status, characterized in that: The device includes: a connecting structure, a handle, a handle base, a detection module, a control module and a battery management unit; The connection structure is formed by two sleeves and a cylindrical structure connected relative to each other using a bolt structure. The sleeve and the cylindrical structure are fixedly connected by a connecting block, and the connecting block is provided with a bolt through hole. The two sleeves and the sleeve in the cylindrical structure are arranged at the connection end with the filling joint of the tube bundle vehicle, and are used to wrap and tighten the filling joint; One end of the cylindrical structure in the two sets of sleeves and the cylindrical structure is fixedly connected to the sleeve through a connecting block, and the other end is used to fixedly connect the hydrogen storage output pipe joint, which is used to wrap and tighten the hydrogen storage output pipe joint and the tube bundle vehicle filling joint. Each set of sleeves and cylindrical structures is provided with a handle, which is used to replace a wrench to connect the flexible joint of the hydrogen storage output pipe with the filling joint of the tube bundle vehicle, and to lock and reinforce the connection structure after the connection is completed; the handle base is fixedly sleeved on the flexible joint of the hydrogen storage output pipe to provide a clamping base for the handle; The detection module includes a detection structure and a detection circuit. The detection structure includes a strain detection structure, which is arranged between the connection blocks at the rear end of the sleeve facing the cylindrical structure, and is used to detect the rotational tightening torque of the flexible joint during the tightening process. The detection circuit includes a signal amplification circuit, which amplifies the rotational tightening torque signal and transmits it to the control module; The control module is in communication with the detection module and the hydrogen delivery valve, and is used to receive a detection signal, control the hydrogen delivery valve according to the detection signal based on a control program, and output prompt information.

2. The device according to claim 1, characterized in that The sleeve adopts a hexagonal structure, and the handle adopts a foldable handle, one end of which is movably connected to the sleeve, so that the sleeve can be directly rotated and tightened by using the handle when the movable joint of the hydrogen storage output pipe is connected to the filling joint of the tube bundle vehicle.

3. The device according to claim 1, characterized in that The sleeve is fixedly connected to both sides of the cylindrical structure through connecting blocks, and a plurality of bolt through holes are provided on each connecting block.

4. The device according to claim 1, characterized in that A strain gauge pasting hole is provided between the upper and lower connecting blocks at the rear end of the sleeve for pasting and setting the strain detection structure, which adopts a strain resistance sheet.

5. The device according to claim 1, characterized in that The tail end of the handle is provided with a hook-type buckle that can be extended and retracted to a limited distance, which is used to clamp with the handle base fixedly sleeved on the flexible joint end of the hydrogen storage output pipe to prevent the flexible joint from falling off and separating from the filling joint.

6. The device according to claim 1, characterized in that The detection circuit also includes a combustible gas detection circuit, which realizes real-time detection of combustible gas through an electrochemical sensor and transmits the combustible gas detection signal to the control module in real time, and the control module realizes data recognition and outputs early warning information.

7. The device according to claim 1, characterized in that The detection circuit also includes a folding mechanism detection circuit, which uses a rotation angle sensor to detect the folding state of the foldable handle by measuring the tap position of the adjustable potentiometer, and then the control module generates and outputs prompt information based on the folding state information.

8. The device according to claim 1, characterized in that The detection module is provided with a state transmitting unit for unidirectionally transmitting the detection signal to the control module. The state transmitting unit adopts a wireless radio frequency encoding chip and is in a sleep mode when there is no detection signal to be sent.

9. The device according to claim 1, characterized in that The control module includes a signal receiving unit, a single-chip microcomputer and peripheral circuits. The signal receiving unit is used to receive one or more detection signals. The single-chip microcomputer adopts an STM32L071 single-chip microcomputer to complete the control and data processing of each detection circuit and generate corresponding output instructions; The signal receiving unit adopts a wireless transceiver unit. In normal working state, it enters sleep mode in response to the command of the USART interface of the single-chip microcomputer. In idle state, it wakes up regularly according to a set period to listen for command reception requirements.

10. The device according to claim 1, characterized in that The battery management unit is used to convert the power supply voltage and monitor the battery voltage in real time, and transmit the monitoring results to the control module, which outputs prompt information based on the monitoring results. The DCDC conversion circuit is used to boost and buck the power supply.

11. An application method of a filling connector anti-drop protection device capable of detecting connection status, characterized in that: The method is applied to the device according to any one of claims 1 to 10, and the method comprises: Device preparation steps: After verifying the stability of the bolts connecting the protection device, securely connect the protection device to the flexible joint of the hydrogen storage output pipe, leaving the handle in an unfolded state; Filling joint tightening step: insert the filling joint of the tube bundle vehicle that meets the filling requirements into the sleeve of the protective device, wrap the filling joint and tighten it with the handle; Connection status identification step: During the tightening process, the detection module continuously uses the strain detection structure to detect the rotational tightening torque information of the flexible joint, and transmits it to the control module through the detection circuit. Based on the preset torque threshold value, it is determined that when the real-time rotational tightening torque meets the set requirement, it indicates that the tightening state of the flexible joint meets the requirement, and a reminder instruction is output to stop tightening; Handle tightening steps: clamp the hook buckle at the end of the handle to the handle base on the flexible joint end of the hydrogen storage output pipe, and then apply force towards the sleeve to fully fold the handle to prevent the filling joint from falling off; Filling execution steps: Open the relevant hydrogen delivery valves of the hydrogen storage system to realize hydrogen filling.

12. The method according to claim 11, characterized in that In the filling execution step, the detection circuit of the detection module monitors the combustible gas leakage during the filling process and the folding state data of the handle in real time, and the control module generates and outputs early warning information based on the real-time detection data.

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